/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ // vim:cindent:ts=2:et:sw=2: /* This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ /* * construction of a frame tree that is nearly isomorphic to the content * tree and updating of that tree in response to dynamic changes */ #include "mozilla/Util.h" #include "nsCSSFrameConstructor.h" #include "nsCRT.h" #include "nsIAtom.h" #include "nsIURL.h" #include "nsHashtable.h" #include "nsIHTMLDocument.h" #include "nsIStyleRule.h" #include "nsIFrame.h" #include "nsGkAtoms.h" #include "nsPresContext.h" #include "nsILinkHandler.h" #include "nsIDocument.h" #include "nsTableFrame.h" #include "nsTableColGroupFrame.h" #include "nsTableColFrame.h" #include "nsIDOMHTMLDocument.h" #include "nsIDOMHTMLTableColElement.h" #include "nsIDOMHTMLTableCaptionElem.h" #include "nsHTMLParts.h" #include "nsIPresShell.h" #include "nsUnicharUtils.h" #include "nsStyleSet.h" #include "nsIViewManager.h" #include "nsEventStates.h" #include "nsStyleConsts.h" #include "nsTableOuterFrame.h" #include "nsIDOMXULElement.h" #include "nsContainerFrame.h" #include "nsINameSpaceManager.h" #include "nsIDOMHTMLSelectElement.h" #include "nsIDOMHTMLLegendElement.h" #include "nsIComboboxControlFrame.h" #include "nsIListControlFrame.h" #include "nsISelectControlFrame.h" #include "nsIDOMCharacterData.h" #include "nsIDOMHTMLImageElement.h" #include "nsPlaceholderFrame.h" #include "nsTableRowGroupFrame.h" #include "nsStyleChangeList.h" #include "nsIFormControl.h" #include "nsCSSAnonBoxes.h" #include "nsTextFragment.h" #include "nsIAnonymousContentCreator.h" #include "nsLegendFrame.h" #include "nsIContentIterator.h" #include "nsBoxLayoutState.h" #include "nsBindingManager.h" #include "nsXBLBinding.h" #include "nsITheme.h" #include "nsContentCID.h" #include "nsContentUtils.h" #include "nsIScriptError.h" #include "nsIDocShell.h" #include "nsIDocShellTreeItem.h" #include "nsObjectFrame.h" #include "nsRuleNode.h" #include "nsIDOMMutationEvent.h" #include "nsChildIterator.h" #include "nsCSSRendering.h" #include "nsError.h" #include "nsLayoutUtils.h" #include "nsAutoPtr.h" #include "nsBoxFrame.h" #include "nsBoxLayout.h" #include "nsImageFrame.h" #include "nsIObjectLoadingContent.h" #include "nsIPrincipal.h" #include "nsStyleUtil.h" #include "nsBox.h" #include "nsTArray.h" #include "nsGenericDOMDataNode.h" #include "mozilla/dom/Element.h" #include "FrameLayerBuilder.h" #include "nsAutoLayoutPhase.h" #include "nsCSSRenderingBorders.h" #include "nsRenderingContext.h" #include "nsStyleStructInlines.h" #ifdef MOZ_XUL #include "nsIRootBox.h" #include "nsIDOMXULCommandDispatcher.h" #include "nsIDOMXULDocument.h" #include "nsIXULDocument.h" #endif #ifdef MOZ_FLEXBOX #include "nsFlexContainerFrame.h" #endif #ifdef ACCESSIBILITY #include "nsAccessibilityService.h" #endif #include "nsInlineFrame.h" #include "nsBlockFrame.h" #include "nsIScrollableFrame.h" #include "nsXBLService.h" #undef NOISY_FIRST_LETTER #include "nsMathMLParts.h" #include "nsIDOMSVGFilters.h" #include "DOMSVGTests.h" #include "nsSVGEffects.h" #include "nsSVGUtils.h" #include "nsRefreshDriver.h" #include "nsRuleProcessorData.h" #include "sampler.h" using namespace mozilla; using namespace mozilla::dom; // An alias for convenience. static const nsIFrame::ChildListID kPrincipalList = nsIFrame::kPrincipalList; nsIFrame* NS_NewHTMLCanvasFrame (nsIPresShell* aPresShell, nsStyleContext* aContext); #if defined(MOZ_MEDIA) nsIFrame* NS_NewHTMLVideoFrame (nsIPresShell* aPresShell, nsStyleContext* aContext); #endif #include "nsSVGTextContainerFrame.h" nsIFrame* NS_NewSVGOuterSVGFrame(nsIPresShell* aPresShell, nsStyleContext* aContext); nsIFrame* NS_NewSVGOuterSVGAnonChildFrame(nsIPresShell* aPresShell, nsStyleContext* aContext); nsIFrame* NS_NewSVGInnerSVGFrame(nsIPresShell* aPresShell, nsStyleContext* aContext); nsIFrame* NS_NewSVGPathGeometryFrame(nsIPresShell* aPresShell, nsStyleContext* aContext); nsIFrame* NS_NewSVGGFrame(nsIPresShell* aPresShell, nsStyleContext* aContext); nsIFrame* NS_NewSVGGenericContainerFrame(nsIPresShell* aPresShell, nsStyleContext* aContext); nsIFrame* NS_NewSVGForeignObjectFrame(nsIPresShell* aPresShell, nsStyleContext* aContext); nsIFrame* NS_NewSVGAFrame(nsIPresShell* aPresShell, nsStyleContext* aContext); nsIFrame* NS_NewSVGGlyphFrame(nsIPresShell* aPresShell, nsStyleContext* aContext); nsIFrame* NS_NewSVGSwitchFrame(nsIPresShell* aPresShell, nsStyleContext* aContext); nsIFrame* NS_NewSVGTextFrame(nsIPresShell* aPresShell, nsStyleContext* aContext); nsIFrame* NS_NewSVGTSpanFrame(nsIPresShell* aPresShell, nsStyleContext* aContext); nsIFrame* NS_NewSVGContainerFrame(nsIPresShell* aPresShell, nsStyleContext* aContext); nsIFrame* NS_NewSVGUseFrame(nsIPresShell* aPresShell, nsStyleContext* aContext); nsIFrame* NS_NewSVGViewFrame(nsIPresShell* aPresShell, nsStyleContext* aContext); extern nsIFrame* NS_NewSVGLinearGradientFrame(nsIPresShell *aPresShell, nsStyleContext* aContext); extern nsIFrame* NS_NewSVGRadialGradientFrame(nsIPresShell *aPresShell, nsStyleContext* aContext); extern nsIFrame* NS_NewSVGStopFrame(nsIPresShell *aPresShell, nsStyleContext* aContext); nsIFrame* NS_NewSVGMarkerFrame(nsIPresShell* aPresShell, nsStyleContext* aContext); extern nsIFrame* NS_NewSVGImageFrame(nsIPresShell *aPresShell, nsStyleContext* aContext); nsIFrame* NS_NewSVGClipPathFrame(nsIPresShell* aPresShell, nsStyleContext* aContext); nsIFrame* NS_NewSVGTextPathFrame(nsIPresShell* aPresShell, nsStyleContext* aContext); nsIFrame* NS_NewSVGFilterFrame(nsIPresShell *aPresShell, nsStyleContext* aContext); nsIFrame* NS_NewSVGPatternFrame(nsIPresShell* aPresShell, nsStyleContext* aContext); nsIFrame* NS_NewSVGMaskFrame(nsIPresShell* aPresShell, nsStyleContext* aContext); nsIFrame* NS_NewSVGFEContainerFrame(nsIPresShell* aPresShell, nsStyleContext* aContext); nsIFrame* NS_NewSVGFELeafFrame(nsIPresShell* aPresShell, nsStyleContext* aContext); nsIFrame* NS_NewSVGFEImageFrame(nsIPresShell* aPresShell, nsStyleContext* aContext); nsIFrame* NS_NewSVGFEUnstyledLeafFrame(nsIPresShell* aPresShell, nsStyleContext* aContext); #include "nsIScrollable.h" #include "nsINodeInfo.h" #include "prenv.h" #include "nsWidgetsCID.h" #include "nsNodeInfoManager.h" #include "nsContentCreatorFunctions.h" #include "nsIServiceManager.h" #ifdef DEBUG // Set the environment variable GECKO_FRAMECTOR_DEBUG_FLAGS to one or // more of the following flags (comma separated) for handy debug // output. static bool gNoisyContentUpdates = false; static bool gReallyNoisyContentUpdates = false; static bool gNoisyInlineConstruction = false; struct FrameCtorDebugFlags { const char* name; bool* on; }; static FrameCtorDebugFlags gFlags[] = { { "content-updates", &gNoisyContentUpdates }, { "really-noisy-content-updates", &gReallyNoisyContentUpdates }, { "noisy-inline", &gNoisyInlineConstruction } }; #define NUM_DEBUG_FLAGS (sizeof(gFlags) / sizeof(gFlags[0])) #endif #ifdef MOZ_XUL #include "nsMenuFrame.h" #include "nsMenuPopupFrame.h" #include "nsPopupSetFrame.h" #include "nsTreeColFrame.h" #include "nsIBoxObject.h" #include "nsPIListBoxObject.h" #include "nsListBoxBodyFrame.h" #include "nsListItemFrame.h" #include "nsXULLabelFrame.h" //------------------------------------------------------------------ nsIFrame* NS_NewAutoRepeatBoxFrame(nsIPresShell* aPresShell, nsStyleContext* aContext); nsIFrame* NS_NewRootBoxFrame (nsIPresShell* aPresShell, nsStyleContext* aContext); nsIFrame* NS_NewDocElementBoxFrame(nsIPresShell* aPresShell, nsStyleContext* aContext); nsIFrame* NS_NewThumbFrame (nsIPresShell* aPresShell, nsStyleContext* aContext); nsIFrame* NS_NewDeckFrame (nsIPresShell* aPresShell, nsStyleContext* aContext); nsIFrame* NS_NewLeafBoxFrame (nsIPresShell* aPresShell, nsStyleContext* aContext); nsIFrame* NS_NewStackFrame (nsIPresShell* aPresShell, nsStyleContext* aContext); nsIFrame* NS_NewProgressMeterFrame (nsIPresShell* aPresShell, nsStyleContext* aContext); nsIFrame* NS_NewImageBoxFrame (nsIPresShell* aPresShell, nsStyleContext* aContext); nsIFrame* NS_NewTextBoxFrame (nsIPresShell* aPresShell, nsStyleContext* aContext); nsIFrame* NS_NewGroupBoxFrame (nsIPresShell* aPresShell, nsStyleContext* aContext); nsIFrame* NS_NewButtonBoxFrame (nsIPresShell* aPresShell, nsStyleContext* aContext); nsIFrame* NS_NewSplitterFrame (nsIPresShell* aPresShell, nsStyleContext* aContext); nsIFrame* NS_NewMenuPopupFrame (nsIPresShell* aPresShell, nsStyleContext* aContext); nsIFrame* NS_NewPopupSetFrame(nsIPresShell* aPresShell, nsStyleContext* aContext); nsIFrame* NS_NewMenuFrame (nsIPresShell* aPresShell, nsStyleContext* aContext, uint32_t aFlags); nsIFrame* NS_NewMenuBarFrame (nsIPresShell* aPresShell, nsStyleContext* aContext); nsIFrame* NS_NewTreeBodyFrame (nsIPresShell* aPresShell, nsStyleContext* aContext); // grid nsresult NS_NewGridLayout2 ( nsIPresShell* aPresShell, nsBoxLayout** aNewLayout ); nsIFrame* NS_NewGridRowLeafFrame (nsIPresShell* aPresShell, nsStyleContext* aContext); nsIFrame* NS_NewGridRowGroupFrame (nsIPresShell* aPresShell, nsStyleContext* aContext); // end grid nsIFrame* NS_NewTitleBarFrame (nsIPresShell* aPresShell, nsStyleContext* aContext); nsIFrame* NS_NewResizerFrame (nsIPresShell* aPresShell, nsStyleContext* aContext); #endif nsIFrame* NS_NewHTMLScrollFrame (nsIPresShell* aPresShell, nsStyleContext* aContext, bool aIsRoot); nsIFrame* NS_NewXULScrollFrame (nsIPresShell* aPresShell, nsStyleContext* aContext, bool aIsRoot); nsIFrame* NS_NewSliderFrame (nsIPresShell* aPresShell, nsStyleContext* aContext); nsIFrame* NS_NewScrollbarFrame (nsIPresShell* aPresShell, nsStyleContext* aContext); nsIFrame* NS_NewScrollbarButtonFrame (nsIPresShell* aPresShell, nsStyleContext* aContext); #ifdef NOISY_FINDFRAME static int32_t FFWC_totalCount=0; static int32_t FFWC_doLoop=0; static int32_t FFWC_doSibling=0; static int32_t FFWC_recursions=0; static int32_t FFWC_nextInFlows=0; #endif #ifdef MOZ_FLEXBOX // Returns true if aFrame is an anonymous flex item static inline bool IsAnonymousFlexItem(const nsIFrame* aFrame) { const nsIAtom* pseudoType = aFrame->GetStyleContext()->GetPseudo(); return pseudoType == nsCSSAnonBoxes::anonymousFlexItem; } #endif // MOZ_FLEXBOX static inline nsIFrame* GetFieldSetBlockFrame(nsIFrame* aFieldsetFrame) { // Depends on the fieldset child frame order - see ConstructFieldSetFrame() below. nsIFrame* firstChild = aFieldsetFrame->GetFirstPrincipalChild(); return firstChild && firstChild->GetNextSibling() ? firstChild->GetNextSibling() : firstChild; } #define FCDATA_DECL(_flags, _func) \ { _flags, { (FrameCreationFunc)_func }, nullptr, nullptr } #define FCDATA_WITH_WRAPPING_BLOCK(_flags, _func, _anon_box) \ { _flags | FCDATA_CREATE_BLOCK_WRAPPER_FOR_ALL_KIDS, \ { (FrameCreationFunc)_func }, nullptr, &_anon_box } //---------------------------------------------------------------------- /** * True if aFrame is an actual inline frame in the sense of non-replaced * display:inline CSS boxes. In other words, it can be affected by {ib} * splitting and can contain first-letter frames. Basically, this is either an * inline frame (positioned or otherwise) or an line frame (this last because * it can contain first-letter and because inserting blocks in the middle of it * needs to terminate it). */ static bool IsInlineFrame(const nsIFrame* aFrame) { return aFrame->IsFrameOfType(nsIFrame::eLineParticipant); } /** * True if aFrame is an instance of an SVG frame class or is an inline/block * frame being used for SVG text. */ static bool IsFrameForSVG(const nsIFrame* aFrame) { return aFrame->IsFrameOfType(nsIFrame::eSVG) || aFrame->IsSVGText(); } /** * Returns true iff aFrame explicitly prevents its descendants from floating * (at least, down to the level of descendants which themselves are * float-containing blocks -- those will manage the floating status of any * lower-level descendents inside them, of course). */ static bool ShouldSuppressFloatingOfDescendants(nsIFrame* aFrame) { return aFrame->IsFrameOfType(nsIFrame::eMathML) || aFrame->IsBoxFrame() || aFrame->GetType() == nsGkAtoms::flexContainerFrame; } /** * If any children require a block parent, return the first such child. * Otherwise return null. */ static nsIContent* AnyKidsNeedBlockParent(nsIFrame *aFrameList) { for (nsIFrame *k = aFrameList; k; k = k->GetNextSibling()) { // Line participants, such as text and inline frames, can't be // directly inside a XUL box; they must be wrapped in an // intermediate block. if (k->IsFrameOfType(nsIFrame::eLineParticipant)) { return k->GetContent(); } } return nullptr; } // Reparent a frame into a wrapper frame that is a child of its old parent. static void ReparentFrame(nsFrameManager* aFrameManager, nsIFrame* aNewParentFrame, nsIFrame* aFrame) { aFrame->SetParent(aNewParentFrame); aFrameManager->ReparentStyleContext(aFrame); } static void ReparentFrames(nsFrameManager* aFrameManager, nsIFrame* aNewParentFrame, const nsFrameList& aFrameList) { for (nsFrameList::Enumerator e(aFrameList); !e.AtEnd(); e.Next()) { ReparentFrame(aFrameManager, aNewParentFrame, e.get()); } } //---------------------------------------------------------------------- // // When inline frames get weird and have block frames in them, we // annotate them to help us respond to incremental content changes // more easily. static inline bool IsFrameSpecial(nsIFrame* aFrame) { return (aFrame->GetStateBits() & NS_FRAME_IS_SPECIAL) != 0; } static nsIFrame* GetSpecialSibling(nsIFrame* aFrame) { NS_PRECONDITION(IsFrameSpecial(aFrame), "Shouldn't call this"); // We only store the "special sibling" annotation with the first // frame in the continuation chain. Walk back to find that frame now. return static_cast (aFrame->GetFirstContinuation()-> Properties().Get(nsIFrame::IBSplitSpecialSibling())); } static nsIFrame* GetSpecialPrevSibling(nsIFrame* aFrame) { NS_PRECONDITION(IsFrameSpecial(aFrame), "Shouldn't call this"); // We only store the "special sibling" annotation with the first // frame in the continuation chain. Walk back to find that frame now. return static_cast (aFrame->GetFirstContinuation()-> Properties().Get(nsIFrame::IBSplitSpecialPrevSibling())); } static nsIFrame* GetLastSpecialSibling(nsIFrame* aFrame, bool aReturnEmptyTrailingInline) { for (nsIFrame *frame = aFrame, *next; ; frame = next) { next = GetSpecialSibling(frame); if (!next || (!aReturnEmptyTrailingInline && !next->GetFirstPrincipalChild() && !GetSpecialSibling(next))) { NS_ASSERTION(!next || !frame->IsInlineOutside(), "Should have a block here!"); return frame; } } NS_NOTREACHED("unreachable code"); return nullptr; } static void SetFrameIsSpecial(nsIFrame* aFrame, nsIFrame* aSpecialSibling) { NS_PRECONDITION(aFrame, "bad args!"); // We should be the only continuation NS_ASSERTION(!aFrame->GetPrevContinuation(), "assigning special sibling to other than first continuation!"); NS_ASSERTION(!aFrame->GetNextContinuation() || IsFrameSpecial(aFrame->GetNextContinuation()), "should have no non-special continuations here"); // Mark the frame as "special". aFrame->AddStateBits(NS_FRAME_IS_SPECIAL); if (aSpecialSibling) { NS_ASSERTION(!aSpecialSibling->GetPrevContinuation(), "assigning something other than the first continuation as the " "special sibling"); // Store the "special sibling" (if we were given one) with the // first frame in the flow. FramePropertyTable* props = aFrame->PresContext()->PropertyTable(); props->Set(aFrame, nsIFrame::IBSplitSpecialSibling(), aSpecialSibling); props->Set(aSpecialSibling, nsIFrame::IBSplitSpecialPrevSibling(), aFrame); } } static nsIFrame* GetIBContainingBlockFor(nsIFrame* aFrame) { NS_PRECONDITION(IsFrameSpecial(aFrame), "GetIBContainingBlockFor() should only be called on known IB frames"); // Get the first "normal" ancestor of the target frame. nsIFrame* parentFrame; do { parentFrame = aFrame->GetParent(); if (! parentFrame) { NS_ERROR("no unsplit block frame in IB hierarchy"); return aFrame; } // Note that we ignore non-special frames which have a pseudo on their // style context -- they're not the frames we're looking for! In // particular, they may be hiding a real parent that _is_ special. if (!IsFrameSpecial(parentFrame) && !parentFrame->GetStyleContext()->GetPseudo()) break; aFrame = parentFrame; } while (1); // post-conditions NS_ASSERTION(parentFrame, "no normal ancestor found for special frame in GetIBContainingBlockFor"); NS_ASSERTION(parentFrame != aFrame, "parentFrame is actually the child frame - bogus reslt"); return parentFrame; } //---------------------------------------------------------------------- // Block/inline frame construction logic. We maintain a few invariants here: // // 1. Block frames contain block and inline frames. // // 2. Inline frames only contain inline frames. If an inline parent has a block // child then the block child is migrated upward until it lands in a block // parent (the inline frames containing block is where it will end up). // After this function returns, aLink is pointing to the first link at or // after its starting position for which the next frame is a block. If there // is no such link, it points to the end of the list. static void FindFirstBlock(nsFrameList::FrameLinkEnumerator& aLink) { for ( ; !aLink.AtEnd(); aLink.Next()) { if (!aLink.NextFrame()->IsInlineOutside()) { return; } } } // This function returns a frame link enumerator pointing to the first link in // the list for which the next frame is not block. If there is no such link, // it points to the end of the list. static nsFrameList::FrameLinkEnumerator FindFirstNonBlock(const nsFrameList& aList) { nsFrameList::FrameLinkEnumerator link(aList); for (; !link.AtEnd(); link.Next()) { if (link.NextFrame()->IsInlineOutside()) { break; } } return link; } inline void SetInitialSingleChild(nsIFrame* aParent, nsIFrame* aFrame) { NS_PRECONDITION(!aFrame->GetNextSibling(), "Should be using a frame list"); nsFrameList temp(aFrame, aFrame); aParent->SetInitialChildList(kPrincipalList, temp); } // ----------------------------------------------------------- // Structure used when constructing formatting object trees. struct nsFrameItems : public nsFrameList { // Appends the frame to the end of the list void AddChild(nsIFrame* aChild); }; void nsFrameItems::AddChild(nsIFrame* aChild) { NS_PRECONDITION(aChild, "nsFrameItems::AddChild"); // It'd be really nice if we could just AppendFrames(kPrincipalList, aChild) here, // but some of our callers put frames that have different // parents (caption, I'm looking at you) on the same framelist, and // nsFrameList asserts if you try to do that. if (IsEmpty()) { SetFrames(aChild); } else { NS_ASSERTION(aChild != mLastChild, "Same frame being added to frame list twice?"); mLastChild->SetNextSibling(aChild); mLastChild = nsLayoutUtils::GetLastSibling(aChild); } } // ----------------------------------------------------------- // Structure used when constructing formatting object trees. Contains // state information needed for absolutely positioned elements struct nsAbsoluteItems : nsFrameItems { // containing block for absolutely positioned elements nsIFrame* containingBlock; nsAbsoluteItems(nsIFrame* aContainingBlock); #ifdef DEBUG // XXXbz Does this need a debug-only assignment operator that nulls out the // childList in the nsAbsoluteItems we're copying? Introducing a difference // between debug and non-debug behavior seems bad, so I guess not... ~nsAbsoluteItems() { NS_ASSERTION(!FirstChild(), "Dangling child list. Someone forgot to insert it?"); } #endif // Appends the frame to the end of the list void AddChild(nsIFrame* aChild); }; nsAbsoluteItems::nsAbsoluteItems(nsIFrame* aContainingBlock) : containingBlock(aContainingBlock) { } // Additional behavior is that it sets the frame's NS_FRAME_OUT_OF_FLOW flag void nsAbsoluteItems::AddChild(nsIFrame* aChild) { NS_ASSERTION(aChild->PresContext()->FrameManager()-> GetPlaceholderFrameFor(aChild), "Child without placeholder being added to nsAbsoluteItems?"); aChild->AddStateBits(NS_FRAME_OUT_OF_FLOW); nsFrameItems::AddChild(aChild); } // ----------------------------------------------------------- // Structure for saving the existing state when pushing/poping containing // blocks. The destructor restores the state to its previous state class NS_STACK_CLASS nsFrameConstructorSaveState { public: typedef nsIFrame::ChildListID ChildListID; nsFrameConstructorSaveState(); ~nsFrameConstructorSaveState(); private: nsAbsoluteItems* mItems; // pointer to struct whose data we save/restore bool* mFixedPosIsAbsPos; nsAbsoluteItems mSavedItems; // copy of original data bool mSavedFixedPosIsAbsPos; // The name of the child list in which our frames would belong ChildListID mChildListID; nsFrameConstructorState* mState; friend class nsFrameConstructorState; }; // Structure used to keep track of a list of bindings we need to call // AddToAttachedQueue on. These should be in post-order depth-first // flattened tree traversal order. struct PendingBinding : public PRCList { #ifdef NS_BUILD_REFCNT_LOGGING PendingBinding() { MOZ_COUNT_CTOR(PendingBinding); } ~PendingBinding() { MOZ_COUNT_DTOR(PendingBinding); } #endif nsRefPtr mBinding; }; // Structure used for maintaining state information during the // frame construction process class NS_STACK_CLASS nsFrameConstructorState { public: typedef nsIFrame::ChildListID ChildListID; nsPresContext *mPresContext; nsIPresShell *mPresShell; nsFrameManager *mFrameManager; #ifdef MOZ_XUL // Frames destined for the kPopupList. nsAbsoluteItems mPopupItems; #endif // Containing block information for out-of-flow frames. nsAbsoluteItems mFixedItems; nsAbsoluteItems mAbsoluteItems; nsAbsoluteItems mFloatedItems; nsCOMPtr mFrameState; // These bits will be added to the state bits of any frame we construct // using this state. nsFrameState mAdditionalStateBits; // When working with the -moz-transform property, we want to hook // the abs-pos and fixed-pos lists together, since transformed // elements are fixed-pos containing blocks. This flag determines // whether or not we want to wire the fixed-pos and abs-pos lists // together. bool mFixedPosIsAbsPos; // A boolean to indicate whether we have a "pending" popupgroup. That is, we // have already created the FrameConstructionItem for the root popupgroup but // we have not yet created the relevant frame. bool mHavePendingPopupgroup; // If false (which is the default) then call SetPrimaryFrame() as needed // during frame construction. If true, don't make any SetPrimaryFrame() // calls, except for generated content which doesn't have a primary frame // yet. The mCreatingExtraFrames == true mode is meant to be used for // construction of random "extra" frames for elements via normal frame // construction APIs (e.g. replication of things across pages in paginated // mode). bool mCreatingExtraFrames; nsCOMArray mGeneratedTextNodesWithInitializer; TreeMatchContext mTreeMatchContext; // Constructor // Use the passed-in history state. nsFrameConstructorState(nsIPresShell* aPresShell, nsIFrame* aFixedContainingBlock, nsIFrame* aAbsoluteContainingBlock, nsIFrame* aFloatContainingBlock, nsILayoutHistoryState* aHistoryState); // Get the history state from the pres context's pres shell. nsFrameConstructorState(nsIPresShell* aPresShell, nsIFrame* aFixedContainingBlock, nsIFrame* aAbsoluteContainingBlock, nsIFrame* aFloatContainingBlock); ~nsFrameConstructorState(); // Function to push the existing absolute containing block state and // create a new scope. Code that uses this function should get matching // logic in GetAbsoluteContainingBlock. void PushAbsoluteContainingBlock(nsIFrame* aNewAbsoluteContainingBlock, nsFrameConstructorSaveState& aSaveState); // Function to push the existing float containing block state and // create a new scope. Code that uses this function should get matching // logic in GetFloatContainingBlock. // Pushing a null float containing block forbids any frames from being // floated until a new float containing block is pushed. // XXX we should get rid of null float containing blocks and teach the // various frame classes to deal with floats instead. void PushFloatContainingBlock(nsIFrame* aNewFloatContainingBlock, nsFrameConstructorSaveState& aSaveState); // Function to return the proper geometric parent for a frame with display // struct given by aStyleDisplay and parent's frame given by // aContentParentFrame. nsIFrame* GetGeometricParent(const nsStyleDisplay* aStyleDisplay, nsIFrame* aContentParentFrame) const; /** * Function to add a new frame to the right frame list. This MUST be called * on frames before their children have been processed if the frames might * conceivably be out-of-flow; otherwise cleanup in error cases won't work * right. Also, this MUST be called on frames after they have been * initialized. * @param aNewFrame the frame to add * @param aFrameItems the list to add in-flow frames to * @param aContent the content pointer for aNewFrame * @param aStyleContext the style context resolved for aContent * @param aParentFrame the parent frame for the content if it were in-flow * @param aCanBePositioned pass false if the frame isn't allowed to be * positioned * @param aCanBeFloated pass false if the frame isn't allowed to be * floated * @param aIsOutOfFlowPopup pass true if the frame is an out-of-flow popup * (XUL-only) * @throws NS_ERROR_OUT_OF_MEMORY if it happens. * @note If this method throws, that means that aNewFrame was not inserted * into any frame lists. Furthermore, this method will handle cleanup * of aNewFrame (via calling Destroy() on it). */ nsresult AddChild(nsIFrame* aNewFrame, nsFrameItems& aFrameItems, nsIContent* aContent, nsStyleContext* aStyleContext, nsIFrame* aParentFrame, bool aCanBePositioned = true, bool aCanBeFloated = true, bool aIsOutOfFlowPopup = false, bool aInsertAfter = false, nsIFrame* aInsertAfterFrame = nullptr); /** * Function to return the fixed-pos element list. Normally this will just hand back the * fixed-pos element list, but in case we're dealing with a transformed element that's * acting as an abs-pos and fixed-pos container, we'll hand back the abs-pos list. Callers should * use this function if they want to get the list acting as the fixed-pos item parent. */ nsAbsoluteItems& GetFixedItems() { return mFixedPosIsAbsPos ? mAbsoluteItems : mFixedItems; } const nsAbsoluteItems& GetFixedItems() const { return mFixedPosIsAbsPos ? mAbsoluteItems : mFixedItems; } /** * class to automatically push and pop a pending binding in the frame * constructor state. See nsCSSFrameConstructor::FrameConstructionItem * mPendingBinding documentation. */ class PendingBindingAutoPusher; friend class PendingBindingAutoPusher; class NS_STACK_CLASS PendingBindingAutoPusher { public: PendingBindingAutoPusher(nsFrameConstructorState& aState, PendingBinding* aPendingBinding) : mState(aState), mPendingBinding(aState.mCurrentPendingBindingInsertionPoint) { NS_PRECONDITION(mPendingBinding, "how did that happen?"); if (aPendingBinding) { aState.mCurrentPendingBindingInsertionPoint = aPendingBinding; } } ~PendingBindingAutoPusher() { mState.mCurrentPendingBindingInsertionPoint = mPendingBinding; } private: nsFrameConstructorState& mState; PRCList* mPendingBinding; }; /** * Add a new pending binding to the list */ void AddPendingBinding(PendingBinding* aPendingBinding) { PR_INSERT_BEFORE(aPendingBinding, mCurrentPendingBindingInsertionPoint); } protected: friend class nsFrameConstructorSaveState; /** * ProcessFrameInsertions takes the frames in aFrameItems and adds them as * kids to the aChildListID child list of |aFrameItems.containingBlock|. */ void ProcessFrameInsertions(nsAbsoluteItems& aFrameItems, ChildListID aChildListID); // Our list of all pending bindings. When we're done, we need to call // AddToAttachedQueue on all of them, in order. PRCList mPendingBindings; PRCList* mCurrentPendingBindingInsertionPoint; }; nsFrameConstructorState::nsFrameConstructorState(nsIPresShell* aPresShell, nsIFrame* aFixedContainingBlock, nsIFrame* aAbsoluteContainingBlock, nsIFrame* aFloatContainingBlock, nsILayoutHistoryState* aHistoryState) : mPresContext(aPresShell->GetPresContext()), mPresShell(aPresShell), mFrameManager(aPresShell->FrameManager()), #ifdef MOZ_XUL mPopupItems(nullptr), #endif mFixedItems(aFixedContainingBlock), mAbsoluteItems(aAbsoluteContainingBlock), mFloatedItems(aFloatContainingBlock), // See PushAbsoluteContaningBlock below mFrameState(aHistoryState), mAdditionalStateBits(0), mFixedPosIsAbsPos(aAbsoluteContainingBlock && aAbsoluteContainingBlock->GetStyleDisplay()-> HasTransform()), mHavePendingPopupgroup(false), mCreatingExtraFrames(false), mTreeMatchContext(true, nsRuleWalker::eRelevantLinkUnvisited, aPresShell->GetDocument()), mCurrentPendingBindingInsertionPoint(&mPendingBindings) { #ifdef MOZ_XUL nsIRootBox* rootBox = nsIRootBox::GetRootBox(aPresShell); if (rootBox) { mPopupItems.containingBlock = rootBox->GetPopupSetFrame(); } #endif MOZ_COUNT_CTOR(nsFrameConstructorState); PR_INIT_CLIST(&mPendingBindings); } nsFrameConstructorState::nsFrameConstructorState(nsIPresShell* aPresShell, nsIFrame* aFixedContainingBlock, nsIFrame* aAbsoluteContainingBlock, nsIFrame* aFloatContainingBlock) : mPresContext(aPresShell->GetPresContext()), mPresShell(aPresShell), mFrameManager(aPresShell->FrameManager()), #ifdef MOZ_XUL mPopupItems(nullptr), #endif mFixedItems(aFixedContainingBlock), mAbsoluteItems(aAbsoluteContainingBlock), mFloatedItems(aFloatContainingBlock), // See PushAbsoluteContaningBlock below mAdditionalStateBits(0), mFixedPosIsAbsPos(aAbsoluteContainingBlock && aAbsoluteContainingBlock->GetStyleDisplay()-> HasTransform()), mHavePendingPopupgroup(false), mCreatingExtraFrames(false), mTreeMatchContext(true, nsRuleWalker::eRelevantLinkUnvisited, aPresShell->GetDocument()), mCurrentPendingBindingInsertionPoint(&mPendingBindings) { #ifdef MOZ_XUL nsIRootBox* rootBox = nsIRootBox::GetRootBox(aPresShell); if (rootBox) { mPopupItems.containingBlock = rootBox->GetPopupSetFrame(); } #endif MOZ_COUNT_CTOR(nsFrameConstructorState); mFrameState = aPresShell->GetDocument()->GetLayoutHistoryState(); PR_INIT_CLIST(&mPendingBindings); } nsFrameConstructorState::~nsFrameConstructorState() { // Frame order comparison functions only work properly when the placeholders // have been inserted into the frame tree. So for example if we have a new float // containing the placeholder for a new abs-pos frame, and we process the abs-pos // insertion first, then we won't be able to find the right place to insert in // in the abs-pos list. So put floats in first, because they can contain placeholders // for abs-pos and fixed-pos items whose containing blocks are outside the floats. // Then put abs-pos frames in, because they can contain placeholders for fixed-pos // items whose containing block is outside the abs-pos frames. MOZ_COUNT_DTOR(nsFrameConstructorState); ProcessFrameInsertions(mFloatedItems, nsIFrame::kFloatList); ProcessFrameInsertions(mAbsoluteItems, nsIFrame::kAbsoluteList); ProcessFrameInsertions(mFixedItems, nsIFrame::kFixedList); #ifdef MOZ_XUL ProcessFrameInsertions(mPopupItems, nsIFrame::kPopupList); #endif for (int32_t i = mGeneratedTextNodesWithInitializer.Count() - 1; i >= 0; --i) { mGeneratedTextNodesWithInitializer[i]-> DeleteProperty(nsGkAtoms::genConInitializerProperty); } if (!PR_CLIST_IS_EMPTY(&mPendingBindings)) { nsBindingManager* bindingManager = mPresShell->GetDocument()->BindingManager(); do { PendingBinding* pendingBinding = static_cast(PR_NEXT_LINK(&mPendingBindings)); PR_REMOVE_LINK(pendingBinding); bindingManager->AddToAttachedQueue(pendingBinding->mBinding); delete pendingBinding; } while (!PR_CLIST_IS_EMPTY(&mPendingBindings)); } } static nsIFrame* AdjustAbsoluteContainingBlock(nsIFrame* aContainingBlockIn) { if (!aContainingBlockIn) { return nullptr; } // Always use the container's first continuation. (Inline frames can have // non-fluid bidi continuations...) return aContainingBlockIn->GetFirstContinuation(); } void nsFrameConstructorState::PushAbsoluteContainingBlock(nsIFrame* aNewAbsoluteContainingBlock, nsFrameConstructorSaveState& aSaveState) { aSaveState.mItems = &mAbsoluteItems; aSaveState.mSavedItems = mAbsoluteItems; aSaveState.mChildListID = nsIFrame::kAbsoluteList; aSaveState.mState = this; /* Store whether we're wiring the abs-pos and fixed-pos lists together. */ aSaveState.mFixedPosIsAbsPos = &mFixedPosIsAbsPos; aSaveState.mSavedFixedPosIsAbsPos = mFixedPosIsAbsPos; mAbsoluteItems = nsAbsoluteItems(AdjustAbsoluteContainingBlock(aNewAbsoluteContainingBlock)); /* See if we're wiring the fixed-pos and abs-pos lists together. This happens iff * we're a transformed element. */ mFixedPosIsAbsPos = (aNewAbsoluteContainingBlock && aNewAbsoluteContainingBlock->GetStyleDisplay()->HasTransform()); if (aNewAbsoluteContainingBlock) { aNewAbsoluteContainingBlock->MarkAsAbsoluteContainingBlock(); } } void nsFrameConstructorState::PushFloatContainingBlock(nsIFrame* aNewFloatContainingBlock, nsFrameConstructorSaveState& aSaveState) { NS_PRECONDITION(!aNewFloatContainingBlock || aNewFloatContainingBlock->IsFloatContainingBlock(), "Please push a real float containing block!"); aSaveState.mItems = &mFloatedItems; aSaveState.mSavedItems = mFloatedItems; aSaveState.mChildListID = nsIFrame::kFloatList; aSaveState.mState = this; mFloatedItems = nsAbsoluteItems(aNewFloatContainingBlock); } nsIFrame* nsFrameConstructorState::GetGeometricParent(const nsStyleDisplay* aStyleDisplay, nsIFrame* aContentParentFrame) const { NS_PRECONDITION(aStyleDisplay, "Must have display struct!"); // If there is no container for a fixed, absolute, or floating root // frame, we will ignore the positioning. This hack is originally // brought to you by the letter T: tables, since other roots don't // even call into this code. See bug 178855. // // XXX Disabling positioning in this case is a hack. If one was so inclined, // one could support this either by (1) inserting a dummy block between the // table and the canvas or (2) teaching the canvas how to reflow positioned // elements. (1) has the usual problems when multiple frames share the same // content (notice all the special cases in this file dealing with inner // tables and outer tables which share the same content). (2) requires some // work and possible factoring. // // XXXbz couldn't we just force position to "static" on roots and // float to "none"? That's OK per CSS 2.1, as far as I can tell. if (aContentParentFrame && aContentParentFrame->IsSVGText()) { return aContentParentFrame; } if (aStyleDisplay->IsFloatingStyle() && mFloatedItems.containingBlock) { NS_ASSERTION(!aStyleDisplay->IsAbsolutelyPositionedStyle(), "Absolutely positioned _and_ floating?"); return mFloatedItems.containingBlock; } if (aStyleDisplay->mPosition == NS_STYLE_POSITION_ABSOLUTE && mAbsoluteItems.containingBlock) { return mAbsoluteItems.containingBlock; } if (aStyleDisplay->mPosition == NS_STYLE_POSITION_FIXED && GetFixedItems().containingBlock) { return GetFixedItems().containingBlock; } return aContentParentFrame; } nsresult nsFrameConstructorState::AddChild(nsIFrame* aNewFrame, nsFrameItems& aFrameItems, nsIContent* aContent, nsStyleContext* aStyleContext, nsIFrame* aParentFrame, bool aCanBePositioned, bool aCanBeFloated, bool aIsOutOfFlowPopup, bool aInsertAfter, nsIFrame* aInsertAfterFrame) { NS_PRECONDITION(!aNewFrame->GetNextSibling(), "Shouldn't happen"); const nsStyleDisplay* disp = aNewFrame->GetStyleDisplay(); // The comments in GetGeometricParent regarding root table frames // all apply here, unfortunately. bool needPlaceholder = false; nsFrameState placeholderType; nsFrameItems* frameItems = &aFrameItems; #ifdef MOZ_XUL if (NS_UNLIKELY(aIsOutOfFlowPopup)) { NS_ASSERTION(aNewFrame->GetParent() == mPopupItems.containingBlock, "Popup whose parent is not the popup containing block?"); NS_ASSERTION(mPopupItems.containingBlock, "Must have a popup set frame!"); needPlaceholder = true; frameItems = &mPopupItems; placeholderType = PLACEHOLDER_FOR_POPUP; } else #endif // MOZ_XUL if (aCanBeFloated && aNewFrame->IsFloating() && mFloatedItems.containingBlock) { NS_ASSERTION(aNewFrame->GetParent() == mFloatedItems.containingBlock, "Float whose parent is not the float containing block?"); needPlaceholder = true; frameItems = &mFloatedItems; placeholderType = PLACEHOLDER_FOR_FLOAT; } else if (aCanBePositioned) { if (disp->mPosition == NS_STYLE_POSITION_ABSOLUTE && mAbsoluteItems.containingBlock) { NS_ASSERTION(aNewFrame->GetParent() == mAbsoluteItems.containingBlock, "Abs pos whose parent is not the abs pos containing block?"); needPlaceholder = true; frameItems = &mAbsoluteItems; placeholderType = PLACEHOLDER_FOR_ABSPOS; } if (disp->mPosition == NS_STYLE_POSITION_FIXED && GetFixedItems().containingBlock) { NS_ASSERTION(aNewFrame->GetParent() == GetFixedItems().containingBlock, "Fixed pos whose parent is not the fixed pos containing block?"); needPlaceholder = true; frameItems = &GetFixedItems(); placeholderType = PLACEHOLDER_FOR_FIXEDPOS; } } if (needPlaceholder) { NS_ASSERTION(frameItems != &aFrameItems, "Putting frame in-flow _and_ want a placeholder?"); nsIFrame* placeholderFrame; nsresult rv = nsCSSFrameConstructor::CreatePlaceholderFrameFor(mPresShell, aContent, aNewFrame, aStyleContext, aParentFrame, nullptr, placeholderType, &placeholderFrame); if (NS_FAILED(rv)) { // Note that aNewFrame could be the top frame for a scrollframe setup, // hence already set as the primary frame. So we have to clean up here. // But it shouldn't have any out-of-flow kids. // XXXbz Maybe add a utility function to assert that? aNewFrame->Destroy(); return rv; } placeholderFrame->AddStateBits(mAdditionalStateBits); // Add the placeholder frame to the flow aFrameItems.AddChild(placeholderFrame); } #ifdef DEBUG else { NS_ASSERTION(aNewFrame->GetParent() == aParentFrame, "In-flow frame has wrong parent"); } #endif if (aInsertAfter) { frameItems->InsertFrame(nullptr, aInsertAfterFrame, aNewFrame); } else { frameItems->AddChild(aNewFrame); } return NS_OK; } void nsFrameConstructorState::ProcessFrameInsertions(nsAbsoluteItems& aFrameItems, ChildListID aChildListID) { #define NS_NONXUL_LIST_TEST (&aFrameItems == &mFloatedItems && \ aChildListID == nsIFrame::kFloatList) || \ (&aFrameItems == &mAbsoluteItems && \ aChildListID == nsIFrame::kAbsoluteList) || \ (&aFrameItems == &mFixedItems && \ aChildListID == nsIFrame::kFixedList) #ifdef MOZ_XUL NS_PRECONDITION(NS_NONXUL_LIST_TEST || (&aFrameItems == &mPopupItems && aChildListID == nsIFrame::kPopupList), "Unexpected aFrameItems/aChildListID combination"); #else NS_PRECONDITION(NS_NONXUL_LIST_TEST, "Unexpected aFrameItems/aChildListID combination"); #endif if (aFrameItems.IsEmpty()) { return; } nsIFrame* containingBlock = aFrameItems.containingBlock; NS_ASSERTION(containingBlock, "Child list without containing block?"); // Insert the frames hanging out in aItems. We can use SetInitialChildList() // if the containing block hasn't been reflowed yet (so NS_FRAME_FIRST_REFLOW // is set) and doesn't have any frames in the aChildListID child list yet. const nsFrameList& childList = containingBlock->GetChildList(aChildListID); nsresult rv = NS_OK; if (childList.IsEmpty() && (containingBlock->GetStateBits() & NS_FRAME_FIRST_REFLOW)) { // If we're injecting absolutely positioned frames, inject them on the // absolute containing block if (aChildListID == containingBlock->GetAbsoluteListID()) { rv = containingBlock->GetAbsoluteContainingBlock()-> SetInitialChildList(containingBlock, aChildListID, aFrameItems); } else { rv = containingBlock->SetInitialChildList(aChildListID, aFrameItems); } } else { // Note that whether the frame construction context is doing an append or // not is not helpful here, since it could be appending to some frame in // the middle of the document, which means we're not necessarily // appending to the children of the containing block. // // We need to make sure the 'append to the end of document' case is fast. // So first test the last child of the containing block nsIFrame* lastChild = childList.LastChild(); // CompareTreePosition uses placeholder hierarchy for out of flow frames, // so this will make out-of-flows respect the ordering of placeholders, // which is great because it takes care of anonymous content. nsIFrame* firstNewFrame = aFrameItems.FirstChild(); if (!lastChild || nsLayoutUtils::CompareTreePosition(lastChild, firstNewFrame, containingBlock) < 0) { // no lastChild, or lastChild comes before the new children, so just append rv = mFrameManager->AppendFrames(containingBlock, aChildListID, aFrameItems); } else { // try the other children nsIFrame* insertionPoint = nullptr; for (nsIFrame* f = childList.FirstChild(); f != lastChild; f = f->GetNextSibling()) { int32_t compare = nsLayoutUtils::CompareTreePosition(f, firstNewFrame, containingBlock); if (compare > 0) { // f comes after the new children, so stop here and insert after // the previous frame break; } insertionPoint = f; } rv = mFrameManager->InsertFrames(containingBlock, aChildListID, insertionPoint, aFrameItems); } } NS_POSTCONDITION(aFrameItems.IsEmpty(), "How did that happen?"); // XXXbz And if NS_FAILED(rv), what? I guess we need to clean up the list // and deal with all the placeholders... but what if the placeholders aren't // in the document yet? Could that happen? NS_ASSERTION(NS_SUCCEEDED(rv), "Frames getting lost!"); } nsFrameConstructorSaveState::nsFrameConstructorSaveState() : mItems(nullptr), mFixedPosIsAbsPos(nullptr), mSavedItems(nullptr), mSavedFixedPosIsAbsPos(false), mChildListID(kPrincipalList), mState(nullptr) { } nsFrameConstructorSaveState::~nsFrameConstructorSaveState() { // Restore the state if (mItems) { NS_ASSERTION(mState, "Can't have mItems set without having a state!"); mState->ProcessFrameInsertions(*mItems, mChildListID); *mItems = mSavedItems; #ifdef DEBUG // We've transferred the child list, so drop the pointer we held to it. // Note that this only matters for the assert in ~nsAbsoluteItems. mSavedItems.Clear(); #endif } if (mFixedPosIsAbsPos) { *mFixedPosIsAbsPos = mSavedFixedPosIsAbsPos; } } static bool IsBorderCollapse(nsIFrame* aFrame) { for (nsIFrame* frame = aFrame; frame; frame = frame->GetParent()) { if (nsGkAtoms::tableFrame == frame->GetType()) { return ((nsTableFrame*)frame)->IsBorderCollapse(); } } NS_ASSERTION(false, "program error"); return false; } /** * Moves aFrameList from aOldParent to aNewParent. This updates the parent * pointer of the frames in the list, and reparents their views as needed. * nsFrame::SetParent sets the NS_FRAME_HAS_VIEW bit on aNewParent and its * ancestors as needed. Then it sets the list as the initial child list * on aNewParent, unless aNewParent either already has kids or has been * reflowed; in that case it appends the new frames. Note that this * method differs from ReparentFrames in that it doesn't change the kids' * style contexts. */ // XXXbz Since this is only used for {ib} splits, could we just copy the view // bits from aOldParent to aNewParent and then use the // nsFrameList::ApplySetParent? That would still leave us doing two passes // over the list, of course; if we really wanted to we could factor out the // relevant part of ReparentFrameViewList, I suppose... Or just get rid of // views, which would make most of this function go away. static void MoveChildrenTo(nsPresContext* aPresContext, nsIFrame* aOldParent, nsIFrame* aNewParent, nsFrameList& aFrameList) { bool sameGrandParent = aOldParent->GetParent() == aNewParent->GetParent(); if (aNewParent->HasView() || aOldParent->HasView() || !sameGrandParent) { // Move the frames into the new view nsContainerFrame::ReparentFrameViewList(aPresContext, aFrameList, aOldParent, aNewParent); } for (nsFrameList::Enumerator e(aFrameList); !e.AtEnd(); e.Next()) { e.get()->SetParent(aNewParent); } if (aNewParent->PrincipalChildList().IsEmpty() && (aNewParent->GetStateBits() & NS_FRAME_FIRST_REFLOW)) { aNewParent->SetInitialChildList(kPrincipalList, aFrameList); } else { aNewParent->AppendFrames(kPrincipalList, aFrameList); } } //---------------------------------------------------------------------- nsCSSFrameConstructor::nsCSSFrameConstructor(nsIDocument *aDocument, nsIPresShell *aPresShell) : nsFrameManager(aPresShell) , mDocument(aDocument) , mRootElementFrame(nullptr) , mRootElementStyleFrame(nullptr) , mFixedContainingBlock(nullptr) , mDocElementContainingBlock(nullptr) , mGfxScrollFrame(nullptr) , mPageSequenceFrame(nullptr) , mUpdateCount(0) , mQuotesDirty(false) , mCountersDirty(false) , mIsDestroyingFrameTree(false) , mRebuildAllStyleData(false) , mHasRootAbsPosContainingBlock(false) , mObservingRefreshDriver(false) , mInStyleRefresh(false) , mHoverGeneration(0) , mRebuildAllExtraHint(nsChangeHint(0)) , mPendingRestyles(ELEMENT_HAS_PENDING_RESTYLE | ELEMENT_IS_POTENTIAL_RESTYLE_ROOT, this) , mPendingAnimationRestyles(ELEMENT_HAS_PENDING_ANIMATION_RESTYLE | ELEMENT_IS_POTENTIAL_ANIMATION_RESTYLE_ROOT, this) { // XXXbz this should be in Init() or something! mPendingRestyles.Init(); mPendingAnimationRestyles.Init(); #ifdef DEBUG static bool gFirstTime = true; if (gFirstTime) { gFirstTime = false; char* flags = PR_GetEnv("GECKO_FRAMECTOR_DEBUG_FLAGS"); if (flags) { bool error = false; for (;;) { char* comma = PL_strchr(flags, ','); if (comma) *comma = '\0'; bool found = false; FrameCtorDebugFlags* flag = gFlags; FrameCtorDebugFlags* limit = gFlags + NUM_DEBUG_FLAGS; while (flag < limit) { if (PL_strcasecmp(flag->name, flags) == 0) { *(flag->on) = true; printf("nsCSSFrameConstructor: setting %s debug flag on\n", flag->name); found = true; break; } ++flag; } if (! found) error = true; if (! comma) break; *comma = ','; flags = comma + 1; } if (error) { printf("Here are the available GECKO_FRAMECTOR_DEBUG_FLAGS:\n"); FrameCtorDebugFlags* flag = gFlags; FrameCtorDebugFlags* limit = gFlags + NUM_DEBUG_FLAGS; while (flag < limit) { printf(" %s\n", flag->name); ++flag; } printf("Note: GECKO_FRAMECTOR_DEBUG_FLAGS is a comma separated list of flag\n"); printf("names (no whitespace)\n"); } } } #endif } void nsCSSFrameConstructor::NotifyDestroyingFrame(nsIFrame* aFrame) { NS_PRECONDITION(mUpdateCount != 0, "Should be in an update while destroying frames"); if (aFrame->GetStateBits() & NS_FRAME_GENERATED_CONTENT) { if (mQuoteList.DestroyNodesFor(aFrame)) QuotesDirty(); } if (mCounterManager.DestroyNodesFor(aFrame)) { // Technically we don't need to update anything if we destroyed only // USE nodes. However, this is unlikely to happen in the real world // since USE nodes generally go along with INCREMENT nodes. CountersDirty(); } nsFrameManager::NotifyDestroyingFrame(aFrame); } struct nsGenConInitializer { nsAutoPtr mNode; nsGenConList* mList; void (nsCSSFrameConstructor::*mDirtyAll)(); nsGenConInitializer(nsGenConNode* aNode, nsGenConList* aList, void (nsCSSFrameConstructor::*aDirtyAll)()) : mNode(aNode), mList(aList), mDirtyAll(aDirtyAll) {} }; static void DestroyGenConInitializer(void* aFrame, nsIAtom* aPropertyName, void* aPropertyValue, void* aDtorData) { delete static_cast(aPropertyValue); } already_AddRefed nsCSSFrameConstructor::CreateGenConTextNode(nsFrameConstructorState& aState, const nsString& aString, nsCOMPtr* aText, nsGenConInitializer* aInitializer) { nsCOMPtr content; NS_NewTextNode(getter_AddRefs(content), mDocument->NodeInfoManager()); if (!content) { // XXX The quotes/counters code doesn't like the text pointer // being null in case of dynamic changes! NS_ASSERTION(!aText, "this OOM case isn't handled very well"); return nullptr; } content->SetText(aString, false); if (aText) { *aText = do_QueryInterface(content); } if (aInitializer) { content->SetProperty(nsGkAtoms::genConInitializerProperty, aInitializer, DestroyGenConInitializer); aState.mGeneratedTextNodesWithInitializer.AppendObject(content); } return content.forget(); } already_AddRefed nsCSSFrameConstructor::CreateGeneratedContent(nsFrameConstructorState& aState, nsIContent* aParentContent, nsStyleContext* aStyleContext, uint32_t aContentIndex) { // Get the content value const nsStyleContentData &data = aStyleContext->GetStyleContent()->ContentAt(aContentIndex); nsStyleContentType type = data.mType; if (eStyleContentType_Image == type) { if (!data.mContent.mImage) { // CSS had something specified that couldn't be converted to an // image object return nullptr; } // Create an image content object and pass it the image request. // XXX Check if it's an image type we can handle... nsCOMPtr nodeInfo; nodeInfo = mDocument->NodeInfoManager()-> GetNodeInfo(nsGkAtoms::mozgeneratedcontentimage, nullptr, kNameSpaceID_XHTML, nsIDOMNode::ELEMENT_NODE); nsCOMPtr content; NS_NewGenConImageContent(getter_AddRefs(content), nodeInfo.forget(), data.mContent.mImage); return content.forget(); } switch (type) { case eStyleContentType_String: return CreateGenConTextNode(aState, nsDependentString(data.mContent.mString), nullptr, nullptr); case eStyleContentType_Attr: { nsCOMPtr attrName; int32_t attrNameSpace = kNameSpaceID_None; nsAutoString contentString(data.mContent.mString); int32_t barIndex = contentString.FindChar('|'); // CSS namespace delimiter if (-1 != barIndex) { nsAutoString nameSpaceVal; contentString.Left(nameSpaceVal, barIndex); nsresult error; attrNameSpace = nameSpaceVal.ToInteger(&error, 10); contentString.Cut(0, barIndex + 1); if (contentString.Length()) { if (mDocument->IsHTML() && aParentContent->IsHTML()) { ToLowerCase(contentString); } attrName = do_GetAtom(contentString); } } else { if (mDocument->IsHTML() && aParentContent->IsHTML()) { ToLowerCase(contentString); } attrName = do_GetAtom(contentString); } if (!attrName) { return nullptr; } nsCOMPtr content; NS_NewAttributeContent(mDocument->NodeInfoManager(), attrNameSpace, attrName, getter_AddRefs(content)); return content.forget(); } case eStyleContentType_Counter: case eStyleContentType_Counters: { nsCSSValue::Array* counters = data.mContent.mCounters; nsCounterList* counterList = mCounterManager.CounterListFor( nsDependentString(counters->Item(0).GetStringBufferValue())); if (!counterList) return nullptr; nsCounterUseNode* node = new nsCounterUseNode(counters, aContentIndex, type == eStyleContentType_Counters); nsGenConInitializer* initializer = new nsGenConInitializer(node, counterList, &nsCSSFrameConstructor::CountersDirty); return CreateGenConTextNode(aState, EmptyString(), &node->mText, initializer); } case eStyleContentType_Image: NS_NOTREACHED("handled by if above"); return nullptr; case eStyleContentType_OpenQuote: case eStyleContentType_CloseQuote: case eStyleContentType_NoOpenQuote: case eStyleContentType_NoCloseQuote: { nsQuoteNode* node = new nsQuoteNode(type, aContentIndex); nsGenConInitializer* initializer = new nsGenConInitializer(node, &mQuoteList, &nsCSSFrameConstructor::QuotesDirty); return CreateGenConTextNode(aState, EmptyString(), &node->mText, initializer); } case eStyleContentType_AltContent: { // Use the "alt" attribute; if that fails and the node is an HTML // , try the value attribute and then fall back to some default // localized text we have. // XXX what if the 'alt' attribute is added later, how will we // detect that and do the right thing here? if (aParentContent->HasAttr(kNameSpaceID_None, nsGkAtoms::alt)) { nsCOMPtr content; NS_NewAttributeContent(mDocument->NodeInfoManager(), kNameSpaceID_None, nsGkAtoms::alt, getter_AddRefs(content)); return content.forget(); } if (aParentContent->IsHTML() && aParentContent->NodeInfo()->Equals(nsGkAtoms::input)) { if (aParentContent->HasAttr(kNameSpaceID_None, nsGkAtoms::value)) { nsCOMPtr content; NS_NewAttributeContent(mDocument->NodeInfoManager(), kNameSpaceID_None, nsGkAtoms::value, getter_AddRefs(content)); return content.forget(); } nsXPIDLString temp; nsContentUtils::GetLocalizedString(nsContentUtils::eFORMS_PROPERTIES, "Submit", temp); return CreateGenConTextNode(aState, temp, nullptr, nullptr); } break; } } // switch return nullptr; } /* * aParentFrame - the frame that should be the parent of the generated * content. This is the frame for the corresponding content node, * which must not be a leaf frame. * * Any items created are added to aItems. * * We create an XML element (tag _moz_generated_content_before or * _moz_generated_content_after) representing the pseudoelement. We * create a DOM node for each 'content' item and make those nodes the * children of the XML element. Then we create a frame subtree for * the XML element as if it were a regular child of * aParentFrame/aParentContent, giving the XML element the ::before or * ::after style. */ void nsCSSFrameConstructor::CreateGeneratedContentItem(nsFrameConstructorState& aState, nsIFrame* aParentFrame, nsIContent* aParentContent, nsStyleContext* aStyleContext, nsCSSPseudoElements::Type aPseudoElement, FrameConstructionItemList& aItems) { // XXXbz is this ever true? if (!aParentContent->IsElement()) { NS_ERROR("Bogus generated content parent"); return; } nsStyleSet *styleSet = mPresShell->StyleSet(); // Probe for the existence of the pseudo-element nsRefPtr pseudoStyleContext; pseudoStyleContext = styleSet->ProbePseudoElementStyle(aParentContent->AsElement(), aPseudoElement, aStyleContext, aState.mTreeMatchContext); if (!pseudoStyleContext) return; // |ProbePseudoStyleFor| checked the 'display' property and the // |ContentCount()| of the 'content' property for us. nsCOMPtr nodeInfo; nsIAtom* elemName = aPseudoElement == nsCSSPseudoElements::ePseudo_before ? nsGkAtoms::mozgeneratedcontentbefore : nsGkAtoms::mozgeneratedcontentafter; nodeInfo = mDocument->NodeInfoManager()->GetNodeInfo(elemName, nullptr, kNameSpaceID_None, nsIDOMNode::ELEMENT_NODE); nsCOMPtr container; nsresult rv = NS_NewXMLElement(getter_AddRefs(container), nodeInfo.forget()); if (NS_FAILED(rv)) return; container->SetNativeAnonymous(); rv = container->BindToTree(mDocument, aParentContent, aParentContent, true); if (NS_FAILED(rv)) { container->UnbindFromTree(); return; } uint32_t contentCount = pseudoStyleContext->GetStyleContent()->ContentCount(); for (uint32_t contentIndex = 0; contentIndex < contentCount; contentIndex++) { nsCOMPtr content = CreateGeneratedContent(aState, aParentContent, pseudoStyleContext, contentIndex); if (content) { container->AppendChildTo(content, false); } } AddFrameConstructionItemsInternal(aState, container, aParentFrame, elemName, kNameSpaceID_None, true, pseudoStyleContext, ITEM_IS_GENERATED_CONTENT, aItems); } /**************************************************** ** BEGIN TABLE SECTION ****************************************************/ // The term pseudo frame is being used instead of anonymous frame, since anonymous // frame has been used elsewhere to refer to frames that have generated content // Return whether the given frame is a table pseudo-frame. Note that // cell-content and table-outer frames have pseudo-types, but are always // created, even for non-anonymous cells and tables respectively. So for those // we have to examine the cell or table frame to see whether it's a pseudo // frame. In particular, a lone table caption will have an outer table as its // parent, but will also trigger construction of an empty inner table, which // will be the one we can examine to see whether the outer was a pseudo-frame. static bool IsTablePseudo(nsIFrame* aFrame) { nsIAtom* pseudoType = aFrame->GetStyleContext()->GetPseudo(); return pseudoType && (pseudoType == nsCSSAnonBoxes::table || pseudoType == nsCSSAnonBoxes::inlineTable || pseudoType == nsCSSAnonBoxes::tableColGroup || pseudoType == nsCSSAnonBoxes::tableRowGroup || pseudoType == nsCSSAnonBoxes::tableRow || pseudoType == nsCSSAnonBoxes::tableCell || (pseudoType == nsCSSAnonBoxes::cellContent && aFrame->GetParent()->GetStyleContext()->GetPseudo() == nsCSSAnonBoxes::tableCell) || (pseudoType == nsCSSAnonBoxes::tableOuter && (aFrame->GetFirstPrincipalChild()->GetStyleContext()->GetPseudo() == nsCSSAnonBoxes::table || aFrame->GetFirstPrincipalChild()->GetStyleContext()->GetPseudo() == nsCSSAnonBoxes::inlineTable))); } /* static */ nsCSSFrameConstructor::ParentType nsCSSFrameConstructor::GetParentType(nsIAtom* aFrameType) { if (aFrameType == nsGkAtoms::tableFrame) { return eTypeTable; } if (aFrameType == nsGkAtoms::tableRowGroupFrame) { return eTypeRowGroup; } if (aFrameType == nsGkAtoms::tableRowFrame) { return eTypeRow; } if (aFrameType == nsGkAtoms::tableColGroupFrame) { return eTypeColGroup; } return eTypeBlock; } static nsIFrame* AdjustCaptionParentFrame(nsIFrame* aParentFrame) { if (nsGkAtoms::tableFrame == aParentFrame->GetType()) { return aParentFrame->GetParent();; } return aParentFrame; } /** * If the parent frame is a |tableFrame| and the child is a * |captionFrame|, then we want to insert the frames beneath the * |tableFrame|'s parent frame. Returns |true| if the parent frame * needed to be fixed up. */ static bool GetCaptionAdjustedParent(nsIFrame* aParentFrame, const nsIFrame* aChildFrame, nsIFrame** aAdjParentFrame) { *aAdjParentFrame = aParentFrame; bool haveCaption = false; if (nsGkAtoms::tableCaptionFrame == aChildFrame->GetType()) { haveCaption = true; *aAdjParentFrame = AdjustCaptionParentFrame(aParentFrame); } return haveCaption; } void nsCSSFrameConstructor::AdjustParentFrame(nsIFrame* & aParentFrame, const FrameConstructionData* aFCData, nsStyleContext* aStyleContext) { NS_PRECONDITION(aStyleContext, "Must have child's style context"); NS_PRECONDITION(aFCData, "Must have frame construction data"); bool tablePart = ((aFCData->mBits & FCDATA_IS_TABLE_PART) != 0); if (tablePart && aStyleContext->GetStyleDisplay()->mDisplay == NS_STYLE_DISPLAY_TABLE_CAPTION) { aParentFrame = AdjustCaptionParentFrame(aParentFrame); } } // Pull all the captions present in aItems out into aCaptions static void PullOutCaptionFrames(nsFrameItems& aItems, nsFrameItems& aCaptions) { nsIFrame *child = aItems.FirstChild(); while (child) { nsIFrame *nextSibling = child->GetNextSibling(); if (nsGkAtoms::tableCaptionFrame == child->GetType()) { aItems.RemoveFrame(child); aCaptions.AddChild(child); } child = nextSibling; } } // Construct the outer, inner table frames and the children frames for the table. // XXX Page break frames for pseudo table frames are not constructed to avoid the risk // associated with revising the pseudo frame mechanism. The long term solution // of having frames handle page-break-before/after will solve the problem. nsresult nsCSSFrameConstructor::ConstructTable(nsFrameConstructorState& aState, FrameConstructionItem& aItem, nsIFrame* aParentFrame, const nsStyleDisplay* aDisplay, nsFrameItems& aFrameItems, nsIFrame** aNewFrame) { NS_PRECONDITION(aDisplay->mDisplay == NS_STYLE_DISPLAY_TABLE || aDisplay->mDisplay == NS_STYLE_DISPLAY_INLINE_TABLE, "Unexpected call"); nsIContent* const content = aItem.mContent; nsStyleContext* const styleContext = aItem.mStyleContext; const uint32_t nameSpaceID = aItem.mNameSpaceID; nsresult rv = NS_OK; // create the pseudo SC for the outer table as a child of the inner SC nsRefPtr outerStyleContext; outerStyleContext = mPresShell->StyleSet()-> ResolveAnonymousBoxStyle(nsCSSAnonBoxes::tableOuter, styleContext); // Create the outer table frame which holds the caption and inner table frame nsIFrame* newFrame; if (kNameSpaceID_MathML == nameSpaceID) newFrame = NS_NewMathMLmtableOuterFrame(mPresShell, outerStyleContext); else newFrame = NS_NewTableOuterFrame(mPresShell, outerStyleContext); nsIFrame* geometricParent = aState.GetGeometricParent(outerStyleContext->GetStyleDisplay(), aParentFrame); // Init the table outer frame InitAndRestoreFrame(aState, content, geometricParent, nullptr, newFrame); // Create the inner table frame nsIFrame* innerFrame; if (kNameSpaceID_MathML == nameSpaceID) innerFrame = NS_NewMathMLmtableFrame(mPresShell, styleContext); else innerFrame = NS_NewTableFrame(mPresShell, styleContext); if (!innerFrame) { newFrame->Destroy(); return NS_ERROR_OUT_OF_MEMORY; } InitAndRestoreFrame(aState, content, newFrame, nullptr, innerFrame); // Put the newly created frames into the right child list SetInitialSingleChild(newFrame, innerFrame); rv = aState.AddChild(newFrame, aFrameItems, content, styleContext, aParentFrame); if (NS_FAILED(rv)) { return rv; } if (!mRootElementFrame) { // The frame we're constructing will be the root element frame. // Set mRootElementFrame before processing children. mRootElementFrame = newFrame; } nsFrameItems childItems; // Process children nsFrameConstructorSaveState absoluteSaveState; const nsStyleDisplay* display = outerStyleContext->GetStyleDisplay(); // Mark the table frame as an absolute container if needed if (display->IsPositioned(aParentFrame)) { aState.PushAbsoluteContainingBlock(newFrame, absoluteSaveState); } if (aItem.mFCData->mBits & FCDATA_USE_CHILD_ITEMS) { rv = ConstructFramesFromItemList(aState, aItem.mChildItems, innerFrame, childItems); } else { rv = ProcessChildren(aState, content, styleContext, innerFrame, true, childItems, false, aItem.mPendingBinding); } // XXXbz what about cleaning up? if (NS_FAILED(rv)) return rv; nsFrameItems captionItems; PullOutCaptionFrames(childItems, captionItems); // Set the inner table frame's initial primary list innerFrame->SetInitialChildList(kPrincipalList, childItems); // Set the outer table frame's secondary childlist lists if (captionItems.NotEmpty()) { newFrame->SetInitialChildList(nsIFrame::kCaptionList, captionItems); } *aNewFrame = newFrame; return rv; } nsresult nsCSSFrameConstructor::ConstructTableRow(nsFrameConstructorState& aState, FrameConstructionItem& aItem, nsIFrame* aParentFrame, const nsStyleDisplay* aDisplay, nsFrameItems& aFrameItems, nsIFrame** aNewFrame) { NS_PRECONDITION(aDisplay->mDisplay == NS_STYLE_DISPLAY_TABLE_ROW, "Unexpected call"); nsIContent* const content = aItem.mContent; nsStyleContext* const styleContext = aItem.mStyleContext; const uint32_t nameSpaceID = aItem.mNameSpaceID; nsIFrame* newFrame; if (kNameSpaceID_MathML == nameSpaceID) newFrame = NS_NewMathMLmtrFrame(mPresShell, styleContext); else newFrame = NS_NewTableRowFrame(mPresShell, styleContext); if (NS_UNLIKELY(!newFrame)) { return NS_ERROR_OUT_OF_MEMORY; } InitAndRestoreFrame(aState, content, aParentFrame, nullptr, newFrame); nsFrameItems childItems; nsresult rv; if (aItem.mFCData->mBits & FCDATA_USE_CHILD_ITEMS) { rv = ConstructFramesFromItemList(aState, aItem.mChildItems, newFrame, childItems); } else { rv = ProcessChildren(aState, content, styleContext, newFrame, true, childItems, false, aItem.mPendingBinding); } if (NS_FAILED(rv)) return rv; newFrame->SetInitialChildList(kPrincipalList, childItems); aFrameItems.AddChild(newFrame); *aNewFrame = newFrame; return NS_OK; } nsresult nsCSSFrameConstructor::ConstructTableCol(nsFrameConstructorState& aState, FrameConstructionItem& aItem, nsIFrame* aParentFrame, const nsStyleDisplay* aStyleDisplay, nsFrameItems& aFrameItems, nsIFrame** aNewFrame) { nsIContent* const content = aItem.mContent; nsStyleContext* const styleContext = aItem.mStyleContext; nsTableColFrame* colFrame = NS_NewTableColFrame(mPresShell, styleContext); if (NS_UNLIKELY(!colFrame)) { return NS_ERROR_OUT_OF_MEMORY; } InitAndRestoreFrame(aState, content, aParentFrame, nullptr, colFrame); NS_ASSERTION(colFrame->GetStyleContext() == styleContext, "Unexpected style context"); aFrameItems.AddChild(colFrame); *aNewFrame = colFrame; // construct additional col frames if the col frame has a span > 1 int32_t span = colFrame->GetSpan(); for (int32_t spanX = 1; spanX < span; spanX++) { nsTableColFrame* newCol = NS_NewTableColFrame(mPresShell, styleContext); if (NS_UNLIKELY(!newCol)) { return NS_ERROR_OUT_OF_MEMORY; } InitAndRestoreFrame(aState, content, aParentFrame, nullptr, newCol, false); aFrameItems.LastChild()->SetNextContinuation(newCol); newCol->SetPrevContinuation(aFrameItems.LastChild()); aFrameItems.AddChild(newCol); newCol->SetColType(eColAnonymousCol); } return NS_OK; } nsresult nsCSSFrameConstructor::ConstructTableCell(nsFrameConstructorState& aState, FrameConstructionItem& aItem, nsIFrame* aParentFrame, const nsStyleDisplay* aDisplay, nsFrameItems& aFrameItems, nsIFrame** aNewFrame) { NS_PRECONDITION(aDisplay->mDisplay == NS_STYLE_DISPLAY_TABLE_CELL, "Unexpected call"); nsIContent* const content = aItem.mContent; nsStyleContext* const styleContext = aItem.mStyleContext; const uint32_t nameSpaceID = aItem.mNameSpaceID; bool borderCollapse = IsBorderCollapse(aParentFrame); nsIFrame* newFrame; // is border separate in mathml.css and the MathML code doesn't implement // border collapse. For those users who style with border collapse, // give them the default non-MathML table frames that understand border collapse. // This won't break us because MathML table frames are all subclasses of the default // table code, and so we can freely mix with or , or . // What will happen is just that non-MathML frames won't understand MathML attributes // and will therefore miss the special handling that the MathML code does. if (kNameSpaceID_MathML == nameSpaceID && !borderCollapse) newFrame = NS_NewMathMLmtdFrame(mPresShell, styleContext); else // Warning: If you change this and add a wrapper frame around table cell // frames, make sure Bug 368554 doesn't regress! // See IsInAutoWidthTableCellForQuirk() in nsImageFrame.cpp. newFrame = NS_NewTableCellFrame(mPresShell, styleContext, borderCollapse); if (NS_UNLIKELY(!newFrame)) { return NS_ERROR_OUT_OF_MEMORY; } // Initialize the table cell frame InitAndRestoreFrame(aState, content, aParentFrame, nullptr, newFrame); // Resolve pseudo style and initialize the body cell frame nsRefPtr innerPseudoStyle; innerPseudoStyle = mPresShell->StyleSet()-> ResolveAnonymousBoxStyle(nsCSSAnonBoxes::cellContent, styleContext); // Create a block frame that will format the cell's content bool isBlock; nsIFrame* cellInnerFrame; if (kNameSpaceID_MathML == nameSpaceID) { cellInnerFrame = NS_NewMathMLmtdInnerFrame(mPresShell, innerPseudoStyle); isBlock = false; } else { cellInnerFrame = NS_NewBlockFormattingContext(mPresShell, innerPseudoStyle); isBlock = true; } if (NS_UNLIKELY(!cellInnerFrame)) { newFrame->Destroy(); return NS_ERROR_OUT_OF_MEMORY; } InitAndRestoreFrame(aState, content, newFrame, nullptr, cellInnerFrame); nsFrameItems childItems; nsresult rv; if (aItem.mFCData->mBits & FCDATA_USE_CHILD_ITEMS) { // Need to push ourselves as a float containing block. // XXXbz it might be nice to work on getting the parent // FrameConstructionItem down into ProcessChildren and just making use of // the push there, but that's a bit of work. nsFrameConstructorSaveState floatSaveState; if (!isBlock) { /* MathML case */ aState.PushFloatContainingBlock(nullptr, floatSaveState); } else { aState.PushFloatContainingBlock(cellInnerFrame, floatSaveState); } rv = ConstructFramesFromItemList(aState, aItem.mChildItems, cellInnerFrame, childItems); } else { // Process the child content rv = ProcessChildren(aState, content, styleContext, cellInnerFrame, true, childItems, isBlock, aItem.mPendingBinding); } if (NS_FAILED(rv)) { // Clean up // XXXbz kids of this stuff need to be cleaned up too! cellInnerFrame->Destroy(); newFrame->Destroy(); return rv; } cellInnerFrame->SetInitialChildList(kPrincipalList, childItems); SetInitialSingleChild(newFrame, cellInnerFrame); aFrameItems.AddChild(newFrame); *aNewFrame = newFrame; return NS_OK; } static inline bool NeedFrameFor(const nsFrameConstructorState& aState, nsIFrame* aParentFrame, nsIContent* aChildContent) { // XXX the GetContent() != aChildContent check is needed due to bug 135040. // Remove it once that's fixed. NS_PRECONDITION(!aChildContent->GetPrimaryFrame() || aState.mCreatingExtraFrames || aChildContent->GetPrimaryFrame()->GetContent() != aChildContent, "Why did we get called?"); // don't create a whitespace frame if aParentFrame doesn't want it. // always create frames for children in generated content. counter(), // quotes, and attr() content can easily change dynamically and we don't // want to be reconstructing frames. It's not even clear that these // should be considered ignorable just because they evaluate to // whitespace. // We could handle all this in CreateNeededTablePseudos or some other place // after we build our frame construction items, but that would involve // creating frame construction items for whitespace kids of // eExcludesIgnorableWhitespace frames, where we know we'll be dropping them // all anyway, and involve an extra walk down the frame construction item // list. if (!aParentFrame->IsFrameOfType(nsIFrame::eExcludesIgnorableWhitespace) || aParentFrame->IsGeneratedContentFrame() || !aChildContent->IsNodeOfType(nsINode::eTEXT)) { return true; } aChildContent->SetFlags(NS_CREATE_FRAME_IF_NON_WHITESPACE | NS_REFRAME_IF_WHITESPACE); return !aChildContent->TextIsOnlyWhitespace(); } /*********************************************** * END TABLE SECTION ***********************************************/ static bool CheckOverflow(nsPresContext* aPresContext, const nsStyleDisplay* aDisplay) { if (aDisplay->mOverflowX == NS_STYLE_OVERFLOW_VISIBLE) return false; if (aDisplay->mOverflowX == NS_STYLE_OVERFLOW_CLIP) aPresContext->SetViewportOverflowOverride(NS_STYLE_OVERFLOW_HIDDEN, NS_STYLE_OVERFLOW_HIDDEN); else aPresContext->SetViewportOverflowOverride(aDisplay->mOverflowX, aDisplay->mOverflowY); return true; } /** * This checks the root element and the HTML BODY, if any, for an "overflow" property * that should be applied to the viewport. If one is found then we return the * element that we took the overflow from (which should then be treated as * "overflow:visible"), and we store the overflow style in the prescontext. * @return if scroll was propagated from some content node, the content node it * was propagated from. */ nsIContent* nsCSSFrameConstructor::PropagateScrollToViewport() { // Set default nsPresContext* presContext = mPresShell->GetPresContext(); presContext->SetViewportOverflowOverride(NS_STYLE_OVERFLOW_AUTO, NS_STYLE_OVERFLOW_AUTO); // We never mess with the viewport scroll state // when printing or in print preview if (presContext->IsPaginated()) { return nullptr; } Element* docElement = mDocument->GetRootElement(); // Check the style on the document root element nsStyleSet *styleSet = mPresShell->StyleSet(); nsRefPtr rootStyle; rootStyle = styleSet->ResolveStyleFor(docElement, nullptr); if (!rootStyle) { return nullptr; } if (CheckOverflow(presContext, rootStyle->GetStyleDisplay())) { // tell caller we stole the overflow style from the root element return docElement; } // Don't look in the BODY for non-HTML documents or HTML documents // with non-HTML roots // XXX this should be earlier; we shouldn't even look at the document root // for non-HTML documents. Fix this once we support explicit CSS styling // of the viewport // XXX what about XHTML? nsCOMPtr htmlDoc(do_QueryInterface(mDocument)); if (!htmlDoc || !docElement->IsHTML()) { return nullptr; } nsCOMPtr body; htmlDoc->GetBody(getter_AddRefs(body)); nsCOMPtr bodyElement = do_QueryInterface(body); if (!bodyElement || !bodyElement->NodeInfo()->Equals(nsGkAtoms::body)) { // The body is not a tag, it's a . return nullptr; } nsRefPtr bodyStyle; bodyStyle = styleSet->ResolveStyleFor(bodyElement->AsElement(), rootStyle); if (!bodyStyle) { return nullptr; } if (CheckOverflow(presContext, bodyStyle->GetStyleDisplay())) { // tell caller we stole the overflow style from the body element return bodyElement; } return nullptr; } nsresult nsCSSFrameConstructor::ConstructDocElementFrame(Element* aDocElement, nsILayoutHistoryState* aFrameState, nsIFrame** aNewFrame) { NS_PRECONDITION(mFixedContainingBlock, "No viewport? Someone forgot to call ConstructRootFrame!"); NS_PRECONDITION(mFixedContainingBlock == GetRootFrame(), "Unexpected mFixedContainingBlock"); NS_PRECONDITION(!mDocElementContainingBlock, "Shouldn't have a doc element containing block here"); *aNewFrame = nullptr; // Make sure to call PropagateScrollToViewport before // SetUpDocElementContainingBlock, since it sets up our scrollbar state // properly. #ifdef DEBUG nsIContent* propagatedScrollFrom = #endif PropagateScrollToViewport(); SetUpDocElementContainingBlock(aDocElement); NS_ASSERTION(mDocElementContainingBlock, "Should have parent by now"); nsFrameConstructorState state(mPresShell, mFixedContainingBlock, nullptr, nullptr, aFrameState); // Initialize the ancestor filter with null for now; we'll push // aDocElement once we finish resolving style for it. state.mTreeMatchContext.mAncestorFilter.Init(nullptr); // XXXbz why, exactly? if (!mTempFrameTreeState) state.mPresShell->CaptureHistoryState(getter_AddRefs(mTempFrameTreeState)); // Make sure that we'll handle restyles for this document element in // the future. We need this, because the document element might // have stale restyle bits from a previous frame constructor for // this document. Unlike in AddFrameConstructionItems, it's safe to // unset all element restyle flags, since we don't have any // siblings. aDocElement->UnsetFlags(ELEMENT_ALL_RESTYLE_FLAGS); // --------- CREATE AREA OR BOX FRAME ------- nsRefPtr styleContext; styleContext = mPresShell->StyleSet()->ResolveStyleFor(aDocElement, nullptr); const nsStyleDisplay* display = styleContext->GetStyleDisplay(); // Ensure that our XBL bindings are installed. if (display->mBinding) { // Get the XBL loader. nsresult rv; bool resolveStyle; nsXBLService* xblService = nsXBLService::GetInstance(); if (!xblService) return NS_ERROR_FAILURE; nsRefPtr binding; rv = xblService->LoadBindings(aDocElement, display->mBinding->GetURI(), display->mBinding->mOriginPrincipal, false, getter_AddRefs(binding), &resolveStyle); if (NS_FAILED(rv) && rv != NS_ERROR_XBL_BLOCKED) return NS_OK; // Binding will load asynchronously. if (binding) { // For backwards compat, keep firing the root's constructor // after all of its kids' constructors. So tell the binding // manager about it right now. mDocument->BindingManager()->AddToAttachedQueue(binding); } if (resolveStyle) { styleContext = mPresShell->StyleSet()->ResolveStyleFor(aDocElement, nullptr); display = styleContext->GetStyleDisplay(); } } // --------- IF SCROLLABLE WRAP IN SCROLLFRAME -------- #ifdef DEBUG NS_ASSERTION(!display->IsScrollableOverflow() || state.mPresContext->IsPaginated() || propagatedScrollFrom == aDocElement, "Scrollbars should have been propagated to the viewport"); #endif if (NS_UNLIKELY(display->mDisplay == NS_STYLE_DISPLAY_NONE)) { SetUndisplayedContent(aDocElement, styleContext); return NS_OK; } AncestorFilter::AutoAncestorPusher ancestorPusher(true, state.mTreeMatchContext.mAncestorFilter, aDocElement); // Make sure to start any background image loads for the root element now. styleContext->StartBackgroundImageLoads(); nsFrameConstructorSaveState absoluteSaveState; if (mHasRootAbsPosContainingBlock) { // Push the absolute containing block now so we can absolutely position // the root element state.PushAbsoluteContainingBlock(mDocElementContainingBlock, absoluteSaveState); } nsresult rv; // The rules from CSS 2.1, section 9.2.4, have already been applied // by the style system, so we can assume that display->mDisplay is // either NONE, BLOCK, or TABLE. // contentFrame is the primary frame for the root element. *aNewFrame // is the frame that will be the child of the initial containing block. // These are usually the same frame but they can be different, in // particular if the root frame is positioned, in which case // contentFrame is the out-of-flow frame and *aNewFrame is the // placeholder. nsIFrame* contentFrame; bool processChildren = false; // Check whether we need to build a XUL box or SVG root frame #ifdef MOZ_XUL if (aDocElement->IsXUL()) { contentFrame = NS_NewDocElementBoxFrame(mPresShell, styleContext); if (NS_UNLIKELY(!contentFrame)) { return NS_ERROR_OUT_OF_MEMORY; } InitAndRestoreFrame(state, aDocElement, mDocElementContainingBlock, nullptr, contentFrame); *aNewFrame = contentFrame; processChildren = true; } else #endif if (aDocElement->IsSVG()) { if (aDocElement->Tag() == nsGkAtoms::svg) { // We're going to call the right function ourselves, so no need to give a // function to this FrameConstructionData. // XXXbz on the other hand, if we converted this whole function to // FrameConstructionData/Item, then we'd need the right function // here... but would probably be able to get away with less code in this // function in general. // Use a null PendingBinding, since our binding is not in fact pending. static const FrameConstructionData rootSVGData = FCDATA_DECL(0, nullptr); nsRefPtr extraRef(styleContext); FrameConstructionItem item(&rootSVGData, aDocElement, aDocElement->Tag(), kNameSpaceID_SVG, nullptr, extraRef.forget(), true); nsFrameItems frameItems; rv = ConstructOuterSVG(state, item, mDocElementContainingBlock, styleContext->GetStyleDisplay(), frameItems, &contentFrame); if (NS_FAILED(rv)) return rv; if (!contentFrame || frameItems.IsEmpty()) return NS_ERROR_FAILURE; *aNewFrame = frameItems.FirstChild(); NS_ASSERTION(frameItems.OnlyChild(), "multiple root element frames"); } else { return NS_ERROR_FAILURE; } } else { bool docElemIsTable = (display->mDisplay == NS_STYLE_DISPLAY_TABLE); if (docElemIsTable) { // We're going to call the right function ourselves, so no need to give a // function to this FrameConstructionData. // XXXbz on the other hand, if we converted this whole function to // FrameConstructionData/Item, then we'd need the right function // here... but would probably be able to get away with less code in this // function in general. // Use a null PendingBinding, since our binding is not in fact pending. static const FrameConstructionData rootTableData = FCDATA_DECL(0, nullptr); nsRefPtr extraRef(styleContext); FrameConstructionItem item(&rootTableData, aDocElement, aDocElement->Tag(), kNameSpaceID_None, nullptr, extraRef.forget(), true); nsFrameItems frameItems; // if the document is a table then just populate it. rv = ConstructTable(state, item, mDocElementContainingBlock, styleContext->GetStyleDisplay(), frameItems, &contentFrame); if (NS_FAILED(rv)) return rv; if (!contentFrame || frameItems.IsEmpty()) return NS_ERROR_FAILURE; *aNewFrame = frameItems.FirstChild(); NS_ASSERTION(frameItems.OnlyChild(), "multiple root element frames"); } else { contentFrame = NS_NewBlockFormattingContext(mPresShell, styleContext); if (!contentFrame) return NS_ERROR_OUT_OF_MEMORY; nsFrameItems frameItems; // Use a null PendingBinding, since our binding is not in fact pending. rv = ConstructBlock(state, display, aDocElement, state.GetGeometricParent(display, mDocElementContainingBlock), mDocElementContainingBlock, styleContext, &contentFrame, frameItems, display->IsPositioned(contentFrame), nullptr); if (NS_FAILED(rv) || frameItems.IsEmpty()) return rv; *aNewFrame = frameItems.FirstChild(); NS_ASSERTION(frameItems.OnlyChild(), "multiple root element frames"); } } // set the primary frame aDocElement->SetPrimaryFrame(contentFrame); NS_ASSERTION(processChildren ? !mRootElementFrame : mRootElementFrame == contentFrame, "unexpected mRootElementFrame"); mRootElementFrame = contentFrame; // Figure out which frame has the main style for the document element, // assigning it to mRootElementStyleFrame. // Backgrounds should be propagated from that frame to the viewport. mRootElementStyleFrame = contentFrame->GetParentStyleContextFrame(); bool isChild = mRootElementStyleFrame && mRootElementStyleFrame->GetParent() == contentFrame; if (!isChild) { mRootElementStyleFrame = mRootElementFrame; } if (processChildren) { // Still need to process the child content nsFrameItems childItems; NS_ASSERTION(!nsLayoutUtils::GetAsBlock(contentFrame) && !contentFrame->IsFrameOfType(nsIFrame::eSVG), "Only XUL frames should reach here"); // Use a null PendingBinding, since our binding is not in fact pending. ProcessChildren(state, aDocElement, styleContext, contentFrame, true, childItems, false, nullptr); // Set the initial child lists contentFrame->SetInitialChildList(kPrincipalList, childItems); } SetInitialSingleChild(mDocElementContainingBlock, *aNewFrame); return NS_OK; } nsresult nsCSSFrameConstructor::ConstructRootFrame(nsIFrame** aNewFrame) { AUTO_LAYOUT_PHASE_ENTRY_POINT(mPresShell->GetPresContext(), FrameC); NS_PRECONDITION(aNewFrame, "null out param"); nsStyleSet *styleSet = mPresShell->StyleSet(); // Set up our style rule observer. // XXXbz wouldn't this make more sense as part of presshell init? { styleSet->SetBindingManager(mDocument->BindingManager()); } // --------- BUILD VIEWPORT ----------- nsIFrame* viewportFrame = nullptr; nsRefPtr viewportPseudoStyle; viewportPseudoStyle = styleSet->ResolveAnonymousBoxStyle(nsCSSAnonBoxes::viewport, nullptr); viewportFrame = NS_NewViewportFrame(mPresShell, viewportPseudoStyle); // XXXbz do we _have_ to pass a null content pointer to that frame? // Would it really kill us to pass in the root element or something? // What would that break? viewportFrame->Init(nullptr, nullptr, nullptr); // Bind the viewport frame to the root view nsIView* rootView = mPresShell->GetViewManager()->GetRootView(); viewportFrame->SetView(rootView); nsContainerFrame::SyncFrameViewProperties(mPresShell->GetPresContext(), viewportFrame, viewportPseudoStyle, rootView); nsContainerFrame::SyncWindowProperties(mPresShell->GetPresContext(), viewportFrame, rootView); // The viewport is the containing block for 'fixed' elements mFixedContainingBlock = viewportFrame; // Make it an absolute container for fixed-pos elements mFixedContainingBlock->MarkAsAbsoluteContainingBlock(); *aNewFrame = viewportFrame; return NS_OK; } nsresult nsCSSFrameConstructor::SetUpDocElementContainingBlock(nsIContent* aDocElement) { NS_PRECONDITION(aDocElement, "No element?"); NS_PRECONDITION(!aDocElement->GetParent(), "Not root content?"); NS_PRECONDITION(aDocElement->GetCurrentDoc(), "Not in a document?"); NS_PRECONDITION(aDocElement->GetCurrentDoc()->GetRootElement() == aDocElement, "Not the root of the document?"); /* how the root frame hierarchy should look Galley presentation, non-XUL, with scrolling: ViewportFrame [fixed-cb] nsHTMLScrollFrame nsCanvasFrame [abs-cb] root element frame (nsBlockFrame, nsSVGOuterSVGFrame, nsTableOuterFrame, nsPlaceholderFrame) Galley presentation, XUL ViewportFrame [fixed-cb] nsRootBoxFrame root element frame (nsDocElementBoxFrame) Print presentation, non-XUL ViewportFrame nsSimplePageSequenceFrame nsPageFrame [fixed-cb] nsPageContentFrame nsCanvasFrame [abs-cb] root element frame (nsBlockFrame, nsSVGOuterSVGFrame, nsTableOuterFrame, nsPlaceholderFrame) Print-preview presentation, non-XUL ViewportFrame nsHTMLScrollFrame nsSimplePageSequenceFrame nsPageFrame [fixed-cb] nsPageContentFrame nsCanvasFrame [abs-cb] root element frame (nsBlockFrame, nsSVGOuterSVGFrame, nsTableOuterFrame, nsPlaceholderFrame) Print/print preview of XUL is not supported. [fixed-cb]: the default containing block for fixed-pos content [abs-cb]: the default containing block for abs-pos content Meaning of nsCSSFrameConstructor fields: mRootElementFrame is "root element frame". This is the primary frame for the root element. mDocElementContainingBlock is the parent of mRootElementFrame (i.e. nsCanvasFrame or nsRootBoxFrame) mFixedContainingBlock is the [fixed-cb] mGfxScrollFrame is the nsHTMLScrollFrame mentioned above, or null if there isn't one mPageSequenceFrame is the nsSimplePageSequenceFrame, or null if there isn't one */ // --------- CREATE ROOT FRAME ------- // Create the root frame. The document element's frame is a child of the // root frame. // // The root frame serves two purposes: // - reserves space for any margins needed for the document element's frame // - renders the document element's background. This ensures the background covers // the entire canvas as specified by the CSS2 spec nsPresContext* presContext = mPresShell->GetPresContext(); bool isPaginated = presContext->IsRootPaginatedDocument(); nsIFrame* viewportFrame = mFixedContainingBlock; nsStyleContext* viewportPseudoStyle = viewportFrame->GetStyleContext(); nsIFrame* rootFrame = nullptr; nsIAtom* rootPseudo; if (!isPaginated) { #ifdef MOZ_XUL if (aDocElement->IsXUL()) { // pass a temporary stylecontext, the correct one will be set later rootFrame = NS_NewRootBoxFrame(mPresShell, viewportPseudoStyle); } else #endif { // pass a temporary stylecontext, the correct one will be set later rootFrame = NS_NewCanvasFrame(mPresShell, viewportPseudoStyle); mHasRootAbsPosContainingBlock = true; } rootPseudo = nsCSSAnonBoxes::canvas; mDocElementContainingBlock = rootFrame; } else { // Create a page sequence frame rootFrame = NS_NewSimplePageSequenceFrame(mPresShell, viewportPseudoStyle); mPageSequenceFrame = rootFrame; rootPseudo = nsCSSAnonBoxes::pageSequence; } // --------- IF SCROLLABLE WRAP IN SCROLLFRAME -------- // If the device supports scrolling (e.g., in galley mode on the screen and // for print-preview, but not when printing), then create a scroll frame that // will act as the scrolling mechanism for the viewport. // XXX Do we even need a viewport when printing to a printer? // As long as the docshell doesn't prohibit it, and the device supports // it, create a scroll frame that will act as the scolling mechanism for // the viewport. // // Threre are three possible values stored in the docshell: // 1) nsIScrollable::Scrollbar_Never = no scrollbars // 2) nsIScrollable::Scrollbar_Auto = scrollbars appear if needed // 3) nsIScrollable::Scrollbar_Always = scrollbars always // Only need to create a scroll frame/view for cases 2 and 3. bool isHTML = aDocElement->IsHTML(); bool isXUL = false; if (!isHTML) { isXUL = aDocElement->IsXUL(); } // Never create scrollbars for XUL documents bool isScrollable = isPaginated ? presContext->HasPaginatedScrolling() : !isXUL; // We no longer need to do overflow propagation here. It's taken care of // when we construct frames for the element whose overflow might be // propagated NS_ASSERTION(!isScrollable || !isXUL, "XUL documents should never be scrollable - see above"); nsIFrame* newFrame = rootFrame; nsRefPtr rootPseudoStyle; // we must create a state because if the scrollbars are GFX it needs the // state to build the scrollbar frames. nsFrameConstructorState state(mPresShell, nullptr, nullptr, nullptr); // Start off with the viewport as parent; we'll adjust it as needed. nsIFrame* parentFrame = viewportFrame; nsStyleSet* styleSet = mPresShell->StyleSet(); // If paginated, make sure we don't put scrollbars in if (!isScrollable) { rootPseudoStyle = styleSet->ResolveAnonymousBoxStyle(rootPseudo, viewportPseudoStyle); } else { if (rootPseudo == nsCSSAnonBoxes::canvas) { rootPseudo = nsCSSAnonBoxes::scrolledCanvas; } else { NS_ASSERTION(rootPseudo == nsCSSAnonBoxes::pageSequence, "Unknown root pseudo"); rootPseudo = nsCSSAnonBoxes::scrolledPageSequence; } // Build the frame. We give it the content we are wrapping which is the // document element, the root frame, the parent view port frame, and we // should get back the new frame and the scrollable view if one was // created. // resolve a context for the scrollframe nsRefPtr styleContext; styleContext = styleSet->ResolveAnonymousBoxStyle(nsCSSAnonBoxes::viewportScroll, viewportPseudoStyle); // Note that the viewport scrollframe is always built with // overflow:auto style. This forces the scroll frame to create // anonymous content for both scrollbars. This is necessary even // if the HTML or BODY elements are overriding the viewport // scroll style to 'hidden' --- dynamic style changes might put // scrollbars back on the viewport and we don't want to have to // reframe the viewport to create the scrollbar content. newFrame = nullptr; rootPseudoStyle = BeginBuildingScrollFrame( state, aDocElement, styleContext, viewportFrame, rootPseudo, true, newFrame); parentFrame = newFrame; mGfxScrollFrame = newFrame; } rootFrame->SetStyleContextWithoutNotification(rootPseudoStyle); rootFrame->Init(aDocElement, parentFrame, nullptr); if (isScrollable) { FinishBuildingScrollFrame(parentFrame, rootFrame); } if (isPaginated) { // paginated // Create the first page // Set the initial child lists nsIFrame *pageFrame, *canvasFrame; ConstructPageFrame(mPresShell, presContext, rootFrame, nullptr, pageFrame, canvasFrame); SetInitialSingleChild(rootFrame, pageFrame); // The eventual parent of the document element frame. // XXX should this be set for every new page (in ConstructPageFrame)? mDocElementContainingBlock = canvasFrame; mHasRootAbsPosContainingBlock = true; } if (viewportFrame->GetStateBits() & NS_FRAME_FIRST_REFLOW) { SetInitialSingleChild(viewportFrame, newFrame); } else { nsFrameList newFrameList(newFrame, newFrame); viewportFrame->AppendFrames(kPrincipalList, newFrameList); } return NS_OK; } nsresult nsCSSFrameConstructor::ConstructPageFrame(nsIPresShell* aPresShell, nsPresContext* aPresContext, nsIFrame* aParentFrame, nsIFrame* aPrevPageFrame, nsIFrame*& aPageFrame, nsIFrame*& aCanvasFrame) { nsStyleContext* parentStyleContext = aParentFrame->GetStyleContext(); nsStyleSet *styleSet = aPresShell->StyleSet(); nsRefPtr pagePseudoStyle; pagePseudoStyle = styleSet->ResolveAnonymousBoxStyle(nsCSSAnonBoxes::page, parentStyleContext); aPageFrame = NS_NewPageFrame(aPresShell, pagePseudoStyle); if (NS_UNLIKELY(!aPageFrame)) return NS_ERROR_OUT_OF_MEMORY; // Initialize the page frame and force it to have a view. This makes printing of // the pages easier and faster. aPageFrame->Init(nullptr, aParentFrame, aPrevPageFrame); nsRefPtr pageContentPseudoStyle; pageContentPseudoStyle = styleSet->ResolveAnonymousBoxStyle(nsCSSAnonBoxes::pageContent, pagePseudoStyle); nsIFrame* pageContentFrame = NS_NewPageContentFrame(aPresShell, pageContentPseudoStyle); if (NS_UNLIKELY(!pageContentFrame)) return NS_ERROR_OUT_OF_MEMORY; // Initialize the page content frame and force it to have a view. Also make it the // containing block for fixed elements which are repeated on every page. nsIFrame* prevPageContentFrame = nullptr; if (aPrevPageFrame) { prevPageContentFrame = aPrevPageFrame->GetFirstPrincipalChild(); NS_ASSERTION(prevPageContentFrame, "missing page content frame"); } pageContentFrame->Init(nullptr, aPageFrame, prevPageContentFrame); SetInitialSingleChild(aPageFrame, pageContentFrame); mFixedContainingBlock = pageContentFrame; // Make it an absolute container for fixed-pos elements mFixedContainingBlock->MarkAsAbsoluteContainingBlock(); nsRefPtr canvasPseudoStyle; canvasPseudoStyle = styleSet->ResolveAnonymousBoxStyle(nsCSSAnonBoxes::canvas, pageContentPseudoStyle); aCanvasFrame = NS_NewCanvasFrame(aPresShell, canvasPseudoStyle); if (NS_UNLIKELY(!aCanvasFrame)) return NS_ERROR_OUT_OF_MEMORY; nsIFrame* prevCanvasFrame = nullptr; if (prevPageContentFrame) { prevCanvasFrame = prevPageContentFrame->GetFirstPrincipalChild(); NS_ASSERTION(prevCanvasFrame, "missing canvas frame"); } aCanvasFrame->Init(nullptr, pageContentFrame, prevCanvasFrame); SetInitialSingleChild(pageContentFrame, aCanvasFrame); return NS_OK; } /* static */ nsresult nsCSSFrameConstructor::CreatePlaceholderFrameFor(nsIPresShell* aPresShell, nsIContent* aContent, nsIFrame* aFrame, nsStyleContext* aStyleContext, nsIFrame* aParentFrame, nsIFrame* aPrevInFlow, nsFrameState aTypeBit, nsIFrame** aPlaceholderFrame) { nsRefPtr placeholderStyle = aPresShell->StyleSet()-> ResolveStyleForNonElement(aStyleContext->GetParent()); // The placeholder frame gets a pseudo style context nsPlaceholderFrame* placeholderFrame = (nsPlaceholderFrame*)NS_NewPlaceholderFrame(aPresShell, placeholderStyle, aTypeBit); if (placeholderFrame) { placeholderFrame->Init(aContent, aParentFrame, aPrevInFlow); // The placeholder frame has a pointer back to the out-of-flow frame placeholderFrame->SetOutOfFlowFrame(aFrame); aFrame->AddStateBits(NS_FRAME_OUT_OF_FLOW); // Add mapping from absolutely positioned frame to its placeholder frame aPresShell->FrameManager()->RegisterPlaceholderFrame(placeholderFrame); *aPlaceholderFrame = static_cast(placeholderFrame); return NS_OK; } else { return NS_ERROR_OUT_OF_MEMORY; } } // Clears any lazy bits set in the range [aStartContent, aEndContent). If // aEndContent is null, that means to clear bits in all siblings starting with // aStartContent. aStartContent must not be null unless aEndContent is also // null. We do this so that when new children are inserted under elements whose // frame is a leaf the new children don't cause us to try to construct frames // for the existing children again. static inline void ClearLazyBits(nsIContent* aStartContent, nsIContent* aEndContent) { NS_PRECONDITION(aStartContent || !aEndContent, "Must have start child if we have an end child"); for (nsIContent* cur = aStartContent; cur != aEndContent; cur = cur->GetNextSibling()) { cur->UnsetFlags(NODE_DESCENDANTS_NEED_FRAMES | NODE_NEEDS_FRAME); } } nsresult nsCSSFrameConstructor::ConstructSelectFrame(nsFrameConstructorState& aState, FrameConstructionItem& aItem, nsIFrame* aParentFrame, const nsStyleDisplay* aStyleDisplay, nsFrameItems& aFrameItems, nsIFrame** aNewFrame) { nsresult rv = NS_OK; nsIContent* const content = aItem.mContent; nsStyleContext* const styleContext = aItem.mStyleContext; // Construct a frame-based listbox or combobox nsCOMPtr sel(do_QueryInterface(content)); uint32_t size = 1; if (sel) { sel->GetSize(&size); bool multipleSelect = false; sel->GetMultiple(&multipleSelect); // Construct a combobox if size=1 or no size is specified and its multiple select if ((1 == size || 0 == size) && !multipleSelect) { // Construct a frame-based combo box. // The frame-based combo box is built out of three parts. A display area, a button and // a dropdown list. The display area and button are created through anonymous content. // The drop-down list's frame is created explicitly. The combobox frame shares its content // with the drop-down list. uint32_t flags = NS_BLOCK_FLOAT_MGR; nsIFrame* comboboxFrame = NS_NewComboboxControlFrame(mPresShell, styleContext, flags); // Save the history state so we don't restore during construction // since the complete tree is required before we restore. nsILayoutHistoryState *historyState = aState.mFrameState; aState.mFrameState = nullptr; // Initialize the combobox frame InitAndRestoreFrame(aState, content, aState.GetGeometricParent(aStyleDisplay, aParentFrame), nullptr, comboboxFrame); rv = aState.AddChild(comboboxFrame, aFrameItems, content, styleContext, aParentFrame); if (NS_FAILED(rv)) { return rv; } nsIComboboxControlFrame* comboBox = do_QueryFrame(comboboxFrame); NS_ASSERTION(comboBox, "NS_NewComboboxControlFrame returned frame that " "doesn't implement nsIComboboxControlFrame"); // Resolve pseudo element style for the dropdown list nsRefPtr listStyle; listStyle = mPresShell->StyleSet()-> ResolveAnonymousBoxStyle(nsCSSAnonBoxes::dropDownList, styleContext); // Create a listbox nsIFrame* listFrame = NS_NewListControlFrame(mPresShell, listStyle); // Notify the listbox that it is being used as a dropdown list. nsIListControlFrame * listControlFrame = do_QueryFrame(listFrame); if (listControlFrame) { listControlFrame->SetComboboxFrame(comboboxFrame); } // Notify combobox that it should use the listbox as it's popup comboBox->SetDropDown(listFrame); NS_ASSERTION(!listFrame->IsPositioned(), "Ended up with positioned dropdown list somehow."); NS_ASSERTION(!listFrame->IsFloating(), "Ended up with floating dropdown list somehow."); // Initialize the scroll frame positioned. Note that it is NOT // initialized as absolutely positioned. nsIFrame* scrolledFrame = NS_NewSelectsAreaFrame(mPresShell, styleContext, flags); InitializeSelectFrame(aState, listFrame, scrolledFrame, content, comboboxFrame, listStyle, true, aItem.mPendingBinding, aFrameItems); NS_ASSERTION(listFrame->GetView(), "ListFrame's view is nullptr"); // Create display and button frames from the combobox's anonymous content. // The anonymous content is appended to existing anonymous content for this // element (the scrollbars). nsFrameItems childItems; CreateAnonymousFrames(aState, content, comboboxFrame, aItem.mPendingBinding, childItems); comboboxFrame->SetInitialChildList(kPrincipalList, childItems); // Initialize the additional popup child list which contains the // dropdown list frame. nsFrameItems popupItems; popupItems.AddChild(listFrame); comboboxFrame->SetInitialChildList(nsIFrame::kSelectPopupList, popupItems); *aNewFrame = comboboxFrame; aState.mFrameState = historyState; if (aState.mFrameState) { // Restore frame state for the entire subtree of |comboboxFrame|. RestoreFrameState(comboboxFrame, aState.mFrameState); } } else { nsIFrame* listFrame = NS_NewListControlFrame(mPresShell, styleContext); if (listFrame) { rv = NS_OK; } else { rv = NS_ERROR_OUT_OF_MEMORY; } nsIFrame* scrolledFrame = NS_NewSelectsAreaFrame( mPresShell, styleContext, NS_BLOCK_FLOAT_MGR); // ******* this code stolen from Initialze ScrollFrame ******** // please adjust this code to use BuildScrollFrame. InitializeSelectFrame(aState, listFrame, scrolledFrame, content, aParentFrame, styleContext, false, aItem.mPendingBinding, aFrameItems); *aNewFrame = listFrame; } } return rv; } /** * Used to be InitializeScrollFrame but now it's only used for the select tag * But the select tag should really be fixed to use GFX scrollbars that can * be create with BuildScrollFrame. */ nsresult nsCSSFrameConstructor::InitializeSelectFrame(nsFrameConstructorState& aState, nsIFrame* scrollFrame, nsIFrame* scrolledFrame, nsIContent* aContent, nsIFrame* aParentFrame, nsStyleContext* aStyleContext, bool aBuildCombobox, PendingBinding* aPendingBinding, nsFrameItems& aFrameItems) { const nsStyleDisplay* display = aStyleContext->GetStyleDisplay(); // Initialize it nsIFrame* geometricParent = aState.GetGeometricParent(display, aParentFrame); // We don't call InitAndRestoreFrame for scrollFrame because we can only // restore the frame state after its parts have been created (in particular, // the scrollable view). So we have to split Init and Restore. // Initialize the frame scrollFrame->Init(aContent, geometricParent, nullptr); if (!aBuildCombobox) { nsresult rv = aState.AddChild(scrollFrame, aFrameItems, aContent, aStyleContext, aParentFrame); if (NS_FAILED(rv)) { return rv; } } if (aBuildCombobox) { nsContainerFrame::CreateViewForFrame(scrollFrame, true); } BuildScrollFrame(aState, aContent, aStyleContext, scrolledFrame, geometricParent, scrollFrame); if (aState.mFrameState) { // Restore frame state for the scroll frame RestoreFrameStateFor(scrollFrame, aState.mFrameState); } // Process children nsFrameItems childItems; ProcessChildren(aState, aContent, aStyleContext, scrolledFrame, false, childItems, false, aPendingBinding); // Set the scrolled frame's initial child lists scrolledFrame->SetInitialChildList(kPrincipalList, childItems); return NS_OK; } nsresult nsCSSFrameConstructor::ConstructFieldSetFrame(nsFrameConstructorState& aState, FrameConstructionItem& aItem, nsIFrame* aParentFrame, const nsStyleDisplay* aStyleDisplay, nsFrameItems& aFrameItems, nsIFrame** aNewFrame) { nsIContent* const content = aItem.mContent; nsStyleContext* const styleContext = aItem.mStyleContext; nsIFrame* newFrame = NS_NewFieldSetFrame(mPresShell, styleContext); if (NS_UNLIKELY(!newFrame)) { return NS_ERROR_OUT_OF_MEMORY; } // Initialize it InitAndRestoreFrame(aState, content, aState.GetGeometricParent(aStyleDisplay, aParentFrame), nullptr, newFrame); // Resolve style and initialize the frame nsRefPtr fieldsetContentStyle; fieldsetContentStyle = mPresShell->StyleSet()-> ResolveAnonymousBoxStyle(nsCSSAnonBoxes::fieldsetContent, styleContext); nsIFrame* blockFrame = NS_NewBlockFrame(mPresShell, fieldsetContentStyle, NS_BLOCK_FLOAT_MGR | NS_BLOCK_MARGIN_ROOT); InitAndRestoreFrame(aState, content, newFrame, nullptr, blockFrame); nsresult rv = aState.AddChild(newFrame, aFrameItems, content, styleContext, aParentFrame); if (NS_FAILED(rv)) { return rv; } // Process children nsFrameConstructorSaveState absoluteSaveState; nsFrameItems childItems; if (newFrame->IsPositioned()) { aState.PushAbsoluteContainingBlock(newFrame, absoluteSaveState); } ProcessChildren(aState, content, styleContext, blockFrame, true, childItems, true, aItem.mPendingBinding); nsFrameItems fieldsetKids; fieldsetKids.AddChild(blockFrame); for (nsFrameList::Enumerator e(childItems); !e.AtEnd(); e.Next()) { nsIFrame* child = e.get(); if (child->GetContentInsertionFrame()->GetType() == nsGkAtoms::legendFrame) { // We want the legend to be the first frame in the fieldset child list. // That way the EventStateManager will do the right thing when tabbing // from a selection point within the legend (bug 236071), which is // used for implementing legend access keys (bug 81481). // GetAdjustedParentFrame() below depends on this frame order. childItems.RemoveFrame(child); // Make sure to reparent the legend so it has the fieldset as the parent. fieldsetKids.InsertFrame(newFrame, nullptr, child); break; } } // Set the inner frame's initial child lists blockFrame->SetInitialChildList(kPrincipalList, childItems); // Set the outer frame's initial child list newFrame->SetInitialChildList(kPrincipalList, fieldsetKids); newFrame->AddStateBits(NS_FRAME_MAY_HAVE_GENERATED_CONTENT); // our new frame returned is the top frame which is the list frame. *aNewFrame = newFrame; return NS_OK; } static nsIFrame* FindAncestorWithGeneratedContentPseudo(nsIFrame* aFrame) { for (nsIFrame* f = aFrame->GetParent(); f; f = f->GetParent()) { NS_ASSERTION(f->IsGeneratedContentFrame(), "should not have exited generated content"); nsIAtom* pseudo = f->GetStyleContext()->GetPseudo(); if (pseudo == nsCSSPseudoElements::before || pseudo == nsCSSPseudoElements::after) return f; } return nullptr; } #define SIMPLE_FCDATA(_func) FCDATA_DECL(0, _func) #define FULL_CTOR_FCDATA(_flags, _func) \ { _flags | FCDATA_FUNC_IS_FULL_CTOR, { nullptr }, _func, nullptr } /* static */ const nsCSSFrameConstructor::FrameConstructionData* nsCSSFrameConstructor::FindTextData(nsIFrame* aParentFrame) { if (aParentFrame && aParentFrame->IsFrameOfType(nsIFrame::eSVG)) { nsIFrame *ancestorFrame = nsSVGUtils::GetFirstNonAAncestorFrame(aParentFrame); if (ancestorFrame) { nsSVGTextContainerFrame* metrics = do_QueryFrame(ancestorFrame); if (metrics) { static const FrameConstructionData sSVGGlyphData = SIMPLE_FCDATA(NS_NewSVGGlyphFrame); return &sSVGGlyphData; } } return nullptr; } static const FrameConstructionData sTextData = FCDATA_DECL(FCDATA_IS_LINE_PARTICIPANT, NS_NewTextFrame); return &sTextData; } nsresult nsCSSFrameConstructor::ConstructTextFrame(const FrameConstructionData* aData, nsFrameConstructorState& aState, nsIContent* aContent, nsIFrame* aParentFrame, nsStyleContext* aStyleContext, nsFrameItems& aFrameItems) { NS_PRECONDITION(aData, "Must have frame construction data"); nsIFrame* newFrame = (*aData->mFunc.mCreationFunc)(mPresShell, aStyleContext); if (NS_UNLIKELY(!newFrame)) return NS_ERROR_OUT_OF_MEMORY; nsresult rv = InitAndRestoreFrame(aState, aContent, aParentFrame, nullptr, newFrame); if (NS_FAILED(rv)) { newFrame->Destroy(); return rv; } // We never need to create a view for a text frame. if (newFrame->IsGeneratedContentFrame()) { nsAutoPtr initializer; initializer = static_cast( aContent->UnsetProperty(nsGkAtoms::genConInitializerProperty)); if (initializer) { if (initializer->mNode->InitTextFrame(initializer->mList, FindAncestorWithGeneratedContentPseudo(newFrame), newFrame)) { (this->*(initializer->mDirtyAll))(); } initializer->mNode.forget(); } } // Add the newly constructed frame to the flow aFrameItems.AddChild(newFrame); if (!aState.mCreatingExtraFrames) aContent->SetPrimaryFrame(newFrame); return rv; } /* static */ const nsCSSFrameConstructor::FrameConstructionData* nsCSSFrameConstructor::FindDataByInt(int32_t aInt, Element* aElement, nsStyleContext* aStyleContext, const FrameConstructionDataByInt* aDataPtr, uint32_t aDataLength) { for (const FrameConstructionDataByInt *curData = aDataPtr, *endData = aDataPtr + aDataLength; curData != endData; ++curData) { if (curData->mInt == aInt) { const FrameConstructionData* data = &curData->mData; if (data->mBits & FCDATA_FUNC_IS_DATA_GETTER) { return data->mFunc.mDataGetter(aElement, aStyleContext); } return data; } } return nullptr; } /* static */ const nsCSSFrameConstructor::FrameConstructionData* nsCSSFrameConstructor::FindDataByTag(nsIAtom* aTag, Element* aElement, nsStyleContext* aStyleContext, const FrameConstructionDataByTag* aDataPtr, uint32_t aDataLength) { for (const FrameConstructionDataByTag *curData = aDataPtr, *endData = aDataPtr + aDataLength; curData != endData; ++curData) { if (*curData->mTag == aTag) { const FrameConstructionData* data = &curData->mData; if (data->mBits & FCDATA_FUNC_IS_DATA_GETTER) { return data->mFunc.mDataGetter(aElement, aStyleContext); } return data; } } return nullptr; } #define SUPPRESS_FCDATA() FCDATA_DECL(FCDATA_SUPPRESS_FRAME, nullptr) #define SIMPLE_INT_CREATE(_int, _func) { _int, SIMPLE_FCDATA(_func) } #define SIMPLE_INT_CHAIN(_int, _func) \ { _int, FCDATA_DECL(FCDATA_FUNC_IS_DATA_GETTER, _func) } #define COMPLEX_INT_CREATE(_int, _func) \ { _int, FULL_CTOR_FCDATA(0, _func) } #define SIMPLE_TAG_CREATE(_tag, _func) \ { &nsGkAtoms::_tag, SIMPLE_FCDATA(_func) } #define SIMPLE_TAG_CHAIN(_tag, _func) \ { &nsGkAtoms::_tag, FCDATA_DECL(FCDATA_FUNC_IS_DATA_GETTER, _func) } #define COMPLEX_TAG_CREATE(_tag, _func) \ { &nsGkAtoms::_tag, FULL_CTOR_FCDATA(0, _func) } /* static */ const nsCSSFrameConstructor::FrameConstructionData* nsCSSFrameConstructor::FindHTMLData(Element* aElement, nsIAtom* aTag, int32_t aNameSpaceID, nsIFrame* aParentFrame, nsStyleContext* aStyleContext) { // Ignore the tag if it's not HTML content and if it doesn't extend (via XBL) // a valid HTML namespace. This check must match the one in // ShouldHaveFirstLineStyle. if (aNameSpaceID != kNameSpaceID_XHTML) { return nullptr; } NS_ASSERTION(!aParentFrame || aParentFrame->GetStyleContext()->GetPseudo() != nsCSSAnonBoxes::fieldsetContent || aParentFrame->GetParent()->GetType() == nsGkAtoms::fieldSetFrame, "Unexpected parent for fieldset content anon box"); if (aTag == nsGkAtoms::legend && (!aParentFrame || (aParentFrame->GetType() != nsGkAtoms::fieldSetFrame && aParentFrame->GetStyleContext()->GetPseudo() != nsCSSAnonBoxes::fieldsetContent) || !aElement->GetParent() || !aElement->GetParent()->IsHTML(nsGkAtoms::fieldset) || aStyleContext->GetStyleDisplay()->IsFloatingStyle() || aStyleContext->GetStyleDisplay()->IsAbsolutelyPositionedStyle())) { // is only special inside fieldset, check both the frame tree // parent and content tree parent due to XBL issues. For floated or // absolutely positioned legends we want to construct by display type and // not do special legend stuff. // XXXbz it would be nice if we could just decide this based on the parent // tag, and hence just use a SIMPLE_TAG_CHAIN for legend below, but the // fact that with XBL we could end up with this legend element in some // totally weird insertion point makes that chancy, I think. return nullptr; } static const FrameConstructionDataByTag sHTMLData[] = { SIMPLE_TAG_CHAIN(img, nsCSSFrameConstructor::FindImgData), SIMPLE_TAG_CHAIN(mozgeneratedcontentimage, nsCSSFrameConstructor::FindImgData), { &nsGkAtoms::br, FCDATA_DECL(FCDATA_IS_LINE_PARTICIPANT | FCDATA_IS_LINE_BREAK, NS_NewBRFrame) }, SIMPLE_TAG_CREATE(wbr, NS_NewWBRFrame), SIMPLE_TAG_CHAIN(input, nsCSSFrameConstructor::FindInputData), SIMPLE_TAG_CREATE(textarea, NS_NewTextControlFrame), COMPLEX_TAG_CREATE(select, &nsCSSFrameConstructor::ConstructSelectFrame), SIMPLE_TAG_CHAIN(object, nsCSSFrameConstructor::FindObjectData), SIMPLE_TAG_CHAIN(applet, nsCSSFrameConstructor::FindObjectData), SIMPLE_TAG_CHAIN(embed, nsCSSFrameConstructor::FindObjectData), COMPLEX_TAG_CREATE(fieldset, &nsCSSFrameConstructor::ConstructFieldSetFrame), { &nsGkAtoms::legend, FCDATA_DECL(FCDATA_ALLOW_BLOCK_STYLES | FCDATA_MAY_NEED_SCROLLFRAME, NS_NewLegendFrame) }, SIMPLE_TAG_CREATE(frameset, NS_NewHTMLFramesetFrame), SIMPLE_TAG_CREATE(iframe, NS_NewSubDocumentFrame), { &nsGkAtoms::button, FCDATA_WITH_WRAPPING_BLOCK(FCDATA_ALLOW_BLOCK_STYLES, NS_NewHTMLButtonControlFrame, nsCSSAnonBoxes::buttonContent) }, SIMPLE_TAG_CHAIN(canvas, nsCSSFrameConstructor::FindCanvasData), #if defined(MOZ_MEDIA) SIMPLE_TAG_CREATE(video, NS_NewHTMLVideoFrame), SIMPLE_TAG_CREATE(audio, NS_NewHTMLVideoFrame), #endif SIMPLE_TAG_CREATE(progress, NS_NewProgressFrame), SIMPLE_TAG_CREATE(meter, NS_NewMeterFrame) }; return FindDataByTag(aTag, aElement, aStyleContext, sHTMLData, ArrayLength(sHTMLData)); } /* static */ const nsCSSFrameConstructor::FrameConstructionData* nsCSSFrameConstructor::FindImgData(Element* aElement, nsStyleContext* aStyleContext) { if (!nsImageFrame::ShouldCreateImageFrameFor(aElement, aStyleContext)) { return nullptr; } static const FrameConstructionData sImgData = SIMPLE_FCDATA(NS_NewImageFrame); return &sImgData; } /* static */ const nsCSSFrameConstructor::FrameConstructionData* nsCSSFrameConstructor::FindImgControlData(Element* aElement, nsStyleContext* aStyleContext) { if (!nsImageFrame::ShouldCreateImageFrameFor(aElement, aStyleContext)) { return nullptr; } static const FrameConstructionData sImgControlData = SIMPLE_FCDATA(NS_NewImageControlFrame); return &sImgControlData; } /* static */ const nsCSSFrameConstructor::FrameConstructionData* nsCSSFrameConstructor::FindInputData(Element* aElement, nsStyleContext* aStyleContext) { static const FrameConstructionDataByInt sInputData[] = { SIMPLE_INT_CREATE(NS_FORM_INPUT_CHECKBOX, NS_NewGfxCheckboxControlFrame), SIMPLE_INT_CREATE(NS_FORM_INPUT_RADIO, NS_NewGfxRadioControlFrame), SIMPLE_INT_CREATE(NS_FORM_INPUT_FILE, NS_NewFileControlFrame), SIMPLE_INT_CHAIN(NS_FORM_INPUT_IMAGE, nsCSSFrameConstructor::FindImgControlData), SIMPLE_INT_CREATE(NS_FORM_INPUT_EMAIL, NS_NewTextControlFrame), SIMPLE_INT_CREATE(NS_FORM_INPUT_SEARCH, NS_NewTextControlFrame), SIMPLE_INT_CREATE(NS_FORM_INPUT_TEXT, NS_NewTextControlFrame), SIMPLE_INT_CREATE(NS_FORM_INPUT_TEL, NS_NewTextControlFrame), SIMPLE_INT_CREATE(NS_FORM_INPUT_URL, NS_NewTextControlFrame), SIMPLE_INT_CREATE(NS_FORM_INPUT_PASSWORD, NS_NewTextControlFrame), // TODO: this is temporary until a frame is written: bug 635240. SIMPLE_INT_CREATE(NS_FORM_INPUT_NUMBER, NS_NewTextControlFrame), { NS_FORM_INPUT_SUBMIT, FCDATA_WITH_WRAPPING_BLOCK(0, NS_NewGfxButtonControlFrame, nsCSSAnonBoxes::buttonContent) }, { NS_FORM_INPUT_RESET, FCDATA_WITH_WRAPPING_BLOCK(0, NS_NewGfxButtonControlFrame, nsCSSAnonBoxes::buttonContent) }, { NS_FORM_INPUT_BUTTON, FCDATA_WITH_WRAPPING_BLOCK(0, NS_NewGfxButtonControlFrame, nsCSSAnonBoxes::buttonContent) } // Keeping hidden inputs out of here on purpose for so they get frames by // display (in practice, none). }; nsCOMPtr control = do_QueryInterface(aElement); NS_ASSERTION(control, "input doesn't implement nsIFormControl?"); return FindDataByInt(control->GetType(), aElement, aStyleContext, sInputData, ArrayLength(sInputData)); } /* static */ const nsCSSFrameConstructor::FrameConstructionData* nsCSSFrameConstructor::FindObjectData(Element* aElement, nsStyleContext* aStyleContext) { // GetDisplayedType isn't necessarily nsIObjectLoadingContent::TYPE_NULL for // cases when the object is broken/suppressed/etc (e.g. a broken image), but // we want to treat those cases as TYPE_NULL uint32_t type; if (aElement->State().HasAtLeastOneOfStates(NS_EVENT_STATE_BROKEN | NS_EVENT_STATE_USERDISABLED | NS_EVENT_STATE_SUPPRESSED)) { type = nsIObjectLoadingContent::TYPE_NULL; } else { nsCOMPtr objContent(do_QueryInterface(aElement)); NS_ASSERTION(objContent, "applet, embed and object must implement " "nsIObjectLoadingContent!"); objContent->GetDisplayedType(&type); } static const FrameConstructionDataByInt sObjectData[] = { SIMPLE_INT_CREATE(nsIObjectLoadingContent::TYPE_LOADING, NS_NewEmptyFrame), SIMPLE_INT_CREATE(nsIObjectLoadingContent::TYPE_PLUGIN, NS_NewObjectFrame), SIMPLE_INT_CREATE(nsIObjectLoadingContent::TYPE_IMAGE, NS_NewImageFrame), SIMPLE_INT_CREATE(nsIObjectLoadingContent::TYPE_DOCUMENT, NS_NewSubDocumentFrame) // Nothing for TYPE_NULL so we'll construct frames by display there }; return FindDataByInt((int32_t)type, aElement, aStyleContext, sObjectData, ArrayLength(sObjectData)); } /* static */ const nsCSSFrameConstructor::FrameConstructionData* nsCSSFrameConstructor::FindCanvasData(Element* aElement, nsStyleContext* aStyleContext) { // We want to check whether script is enabled on the document that // could be painting to the canvas. That's the owner document of // the canvas, except when the owner document is a static document, // in which case it's the original document it was cloned from. nsIDocument* doc = aElement->OwnerDoc(); if (doc->IsStaticDocument()) { doc = doc->GetOriginalDocument(); } if (!doc->IsScriptEnabled()) { return nullptr; } static const FrameConstructionData sCanvasData = FCDATA_WITH_WRAPPING_BLOCK(0, NS_NewHTMLCanvasFrame, nsCSSAnonBoxes::htmlCanvasContent); return &sCanvasData; } nsresult nsCSSFrameConstructor::ConstructFrameFromItemInternal(FrameConstructionItem& aItem, nsFrameConstructorState& aState, nsIFrame* aParentFrame, nsFrameItems& aFrameItems) { const FrameConstructionData* data = aItem.mFCData; NS_ASSERTION(data, "Must have frame construction data"); uint32_t bits = data->mBits; NS_ASSERTION(!(bits & FCDATA_FUNC_IS_DATA_GETTER), "Should have dealt with this inside the data finder"); // Some sets of bits are not compatible with each other #define CHECK_ONLY_ONE_BIT(_bit1, _bit2) \ NS_ASSERTION(!(bits & _bit1) || !(bits & _bit2), \ "Only one of these bits should be set") CHECK_ONLY_ONE_BIT(FCDATA_FUNC_IS_FULL_CTOR, FCDATA_FORCE_NULL_ABSPOS_CONTAINER); CHECK_ONLY_ONE_BIT(FCDATA_FUNC_IS_FULL_CTOR, FCDATA_WRAP_KIDS_IN_BLOCKS); CHECK_ONLY_ONE_BIT(FCDATA_FUNC_IS_FULL_CTOR, FCDATA_MAY_NEED_SCROLLFRAME); CHECK_ONLY_ONE_BIT(FCDATA_FUNC_IS_FULL_CTOR, FCDATA_IS_POPUP); CHECK_ONLY_ONE_BIT(FCDATA_FUNC_IS_FULL_CTOR, FCDATA_SKIP_ABSPOS_PUSH); CHECK_ONLY_ONE_BIT(FCDATA_FUNC_IS_FULL_CTOR, FCDATA_DISALLOW_GENERATED_CONTENT); CHECK_ONLY_ONE_BIT(FCDATA_FUNC_IS_FULL_CTOR, FCDATA_ALLOW_BLOCK_STYLES); CHECK_ONLY_ONE_BIT(FCDATA_FUNC_IS_FULL_CTOR, FCDATA_CREATE_BLOCK_WRAPPER_FOR_ALL_KIDS); CHECK_ONLY_ONE_BIT(FCDATA_WRAP_KIDS_IN_BLOCKS, FCDATA_CREATE_BLOCK_WRAPPER_FOR_ALL_KIDS); #undef CHECK_ONLY_ONE_BIT NS_ASSERTION(!(bits & FCDATA_FORCED_NON_SCROLLABLE_BLOCK) || ((bits & FCDATA_FUNC_IS_FULL_CTOR) && data->mFullConstructor == &nsCSSFrameConstructor::ConstructNonScrollableBlock), "Unexpected FCDATA_FORCED_NON_SCROLLABLE_BLOCK flag"); // Don't create a subdocument frame for iframes if we're creating extra frames if (aState.mCreatingExtraFrames && aItem.mContent->IsHTML() && aItem.mContent->Tag() == nsGkAtoms::iframe) { return NS_OK; } nsStyleContext* const styleContext = aItem.mStyleContext; const nsStyleDisplay* display = styleContext->GetStyleDisplay(); nsIContent* const content = aItem.mContent; // Push the content as a style ancestor now, so we don't have to do // it in our various full-constructor functions. In particular, // since a number of full-constructor functions don't actually call // ProcessChildren in some cases (e.g. for CSS anonymous table boxes // or for situations where only anonymouse children are having // frames constructed), this is the best place to bottleneck the // pushing of the content instead of having to do it in multiple // places. AncestorFilter::AutoAncestorPusher ancestorPusher(aState.mTreeMatchContext.mAncestorFilter.HasFilter(), aState.mTreeMatchContext.mAncestorFilter, content->IsElement() ? content->AsElement() : nullptr); nsIFrame* newFrame; nsIFrame* primaryFrame; if (bits & FCDATA_FUNC_IS_FULL_CTOR) { nsresult rv = (this->*(data->mFullConstructor))(aState, aItem, aParentFrame, display, aFrameItems, &newFrame); if (NS_FAILED(rv)) { return rv; } primaryFrame = newFrame; } else { newFrame = (*data->mFunc.mCreationFunc)(mPresShell, styleContext); if (!newFrame) { return NS_ERROR_OUT_OF_MEMORY; } bool allowOutOfFlow = !(bits & FCDATA_DISALLOW_OUT_OF_FLOW); bool isPopup = aItem.mIsPopup; NS_ASSERTION(!isPopup || (aState.mPopupItems.containingBlock && aState.mPopupItems.containingBlock->GetType() == nsGkAtoms::popupSetFrame), "Should have a containing block here!"); nsIFrame* geometricParent = isPopup ? aState.mPopupItems.containingBlock : (allowOutOfFlow ? aState.GetGeometricParent(display, aParentFrame) : aParentFrame); nsresult rv = NS_OK; // Must init frameToAddToList to null, since it's inout nsIFrame* frameToAddToList = nullptr; if ((bits & FCDATA_MAY_NEED_SCROLLFRAME) && display->IsScrollableOverflow()) { BuildScrollFrame(aState, content, styleContext, newFrame, geometricParent, frameToAddToList); } else { rv = InitAndRestoreFrame(aState, content, geometricParent, nullptr, newFrame); NS_ASSERTION(NS_SUCCEEDED(rv), "InitAndRestoreFrame failed"); // See whether we need to create a view nsContainerFrame::CreateViewForFrame(newFrame, false); frameToAddToList = newFrame; } // Use frameToAddToList as the primary frame. In the non-scrollframe case // they're equal, but in the scrollframe case newFrame is the scrolled // frame, while frameToAddToList is the scrollframe (and should be the // primary frame). primaryFrame = frameToAddToList; // If we need to create a block formatting context to wrap our // kids, do it now. const nsStyleDisplay* maybeAbsoluteContainingBlockDisplay = display; nsIFrame* maybeAbsoluteContainingBlock = newFrame; nsIFrame* possiblyLeafFrame = newFrame; if (bits & FCDATA_CREATE_BLOCK_WRAPPER_FOR_ALL_KIDS) { nsRefPtr blockContext; blockContext = mPresShell->StyleSet()->ResolveAnonymousBoxStyle(*data->mAnonBoxPseudo, styleContext); nsIFrame* blockFrame = NS_NewBlockFormattingContext(mPresShell, blockContext); if (NS_UNLIKELY(!blockFrame)) { primaryFrame->Destroy(); return NS_ERROR_OUT_OF_MEMORY; } rv = InitAndRestoreFrame(aState, content, newFrame, nullptr, blockFrame); if (NS_FAILED(rv)) { blockFrame->Destroy(); primaryFrame->Destroy(); return rv; } SetInitialSingleChild(newFrame, blockFrame); // Now figure out whether newFrame or blockFrame should be the // absolute container. It should be the latter if it's // positioned, otherwise the former. const nsStyleDisplay* blockDisplay = blockContext->GetStyleDisplay(); if (blockDisplay->IsPositioned(blockFrame)) { maybeAbsoluteContainingBlockDisplay = blockDisplay; maybeAbsoluteContainingBlock = blockFrame; } // Our kids should go into the blockFrame newFrame = blockFrame; } rv = aState.AddChild(frameToAddToList, aFrameItems, content, styleContext, aParentFrame, allowOutOfFlow, allowOutOfFlow, isPopup); if (NS_FAILED(rv)) { return rv; } #ifdef MOZ_XUL // Icky XUL stuff, sadly if (aItem.mIsRootPopupgroup) { NS_ASSERTION(nsIRootBox::GetRootBox(mPresShell) && nsIRootBox::GetRootBox(mPresShell)->GetPopupSetFrame() == newFrame, "Unexpected PopupSetFrame"); aState.mPopupItems.containingBlock = newFrame; aState.mHavePendingPopupgroup = false; } #endif /* MOZ_XUL */ // Process the child content if requested nsFrameItems childItems; nsFrameConstructorSaveState absoluteSaveState; if (bits & FCDATA_FORCE_NULL_ABSPOS_CONTAINER) { aState.PushAbsoluteContainingBlock(nullptr, absoluteSaveState); } else if (!(bits & FCDATA_SKIP_ABSPOS_PUSH) && maybeAbsoluteContainingBlockDisplay->IsPositioned (maybeAbsoluteContainingBlock)) { aState.PushAbsoluteContainingBlock(maybeAbsoluteContainingBlock, absoluteSaveState); } if (bits & FCDATA_USE_CHILD_ITEMS) { NS_ASSERTION(!ShouldSuppressFloatingOfDescendants(newFrame), "uh oh -- this frame is supposed to _suppress_ floats, but " "we're about to push it as a float containing block..."); nsFrameConstructorSaveState floatSaveState; if (newFrame->IsFloatContainingBlock()) { aState.PushFloatContainingBlock(newFrame, floatSaveState); } rv = ConstructFramesFromItemList(aState, aItem.mChildItems, newFrame, childItems); } else { // Process the child frames. rv = ProcessChildren(aState, content, styleContext, newFrame, !(bits & FCDATA_DISALLOW_GENERATED_CONTENT), childItems, (bits & FCDATA_ALLOW_BLOCK_STYLES) != 0, aItem.mPendingBinding, possiblyLeafFrame); } #ifdef MOZ_XUL // More icky XUL stuff if (aItem.mNameSpaceID == kNameSpaceID_XUL && (aItem.mTag == nsGkAtoms::treechildren || // trees always need titletips content->HasAttr(kNameSpaceID_None, nsGkAtoms::tooltiptext) || content->HasAttr(kNameSpaceID_None, nsGkAtoms::tooltip))) { nsIRootBox* rootBox = nsIRootBox::GetRootBox(mPresShell); if (rootBox) { rootBox->AddTooltipSupport(content); } } #endif if (NS_SUCCEEDED(rv) && (bits & FCDATA_WRAP_KIDS_IN_BLOCKS)) { nsFrameItems newItems; nsFrameItems currentBlockItems; nsIFrame* f; while ((f = childItems.FirstChild()) != nullptr) { bool wrapFrame = IsInlineFrame(f) || IsFrameSpecial(f); if (!wrapFrame) { rv = FlushAccumulatedBlock(aState, content, newFrame, currentBlockItems, newItems); if (NS_FAILED(rv)) break; } childItems.RemoveFrame(f); if (wrapFrame) { currentBlockItems.AddChild(f); } else { newItems.AddChild(f); } } rv = FlushAccumulatedBlock(aState, content, newFrame, currentBlockItems, newItems); if (childItems.NotEmpty()) { // an error must have occurred, delete unprocessed frames childItems.DestroyFrames(); } childItems = newItems; } // Set the frame's initial child list // Note that MathML depends on this being called even if // childItems is empty! newFrame->SetInitialChildList(kPrincipalList, childItems); } NS_ASSERTION(newFrame->IsFrameOfType(nsIFrame::eLineParticipant) == ((bits & FCDATA_IS_LINE_PARTICIPANT) != 0), "Incorrectly set FCDATA_IS_LINE_PARTICIPANT bits"); // Even if mCreatingExtraFrames is set, we may need to SetPrimaryFrame for // generated content that doesn't have one yet. Note that we have to examine // the frame bit, because by this point mIsGeneratedContent has been cleared // on aItem. if ((!aState.mCreatingExtraFrames || ((primaryFrame->GetStateBits() & NS_FRAME_GENERATED_CONTENT) && !aItem.mContent->GetPrimaryFrame())) && !(bits & FCDATA_SKIP_FRAMESET)) { aItem.mContent->SetPrimaryFrame(primaryFrame); } return NS_OK; } // after the node has been constructed and initialized create any // anonymous content a node needs. nsresult nsCSSFrameConstructor::CreateAnonymousFrames(nsFrameConstructorState& aState, nsIContent* aParent, nsIFrame* aParentFrame, PendingBinding* aPendingBinding, nsFrameItems& aChildItems) { nsAutoTArray newAnonymousItems; nsresult rv = GetAnonymousContent(aParent, aParentFrame, newAnonymousItems); NS_ENSURE_SUCCESS(rv, rv); uint32_t count = newAnonymousItems.Length(); if (count == 0) { return NS_OK; } nsFrameConstructorState::PendingBindingAutoPusher pusher(aState, aPendingBinding); AncestorFilter::AutoAncestorPusher ancestorPusher(aState.mTreeMatchContext.mAncestorFilter.HasFilter(), aState.mTreeMatchContext.mAncestorFilter, aParent->AsElement()); nsIAnonymousContentCreator* creator = do_QueryFrame(aParentFrame); NS_ASSERTION(creator, "How can that happen if we have nodes to construct frames for?"); for (uint32_t i=0; i < count; i++) { nsIContent* content = newAnonymousItems[i].mContent; NS_ASSERTION(content, "null anonymous content?"); NS_ASSERTION(!newAnonymousItems[i].mStyleContext, "Unexpected style context"); nsIFrame* newFrame = creator->CreateFrameFor(content); if (newFrame) { NS_ASSERTION(content->GetPrimaryFrame(), "Content must have a primary frame now"); aChildItems.AddChild(newFrame); } else { // create the frame and attach it to our frame ConstructFrame(aState, content, aParentFrame, aChildItems); } } return NS_OK; } static void SetFlagsOnSubtree(nsIContent *aNode, uintptr_t aFlagsToSet) { #ifdef DEBUG // Make sure that the node passed to us doesn't have any XBL children { nsIDocument *doc = aNode->OwnerDoc(); NS_ASSERTION(doc, "The node must be in a document"); NS_ASSERTION(!doc->BindingManager()->GetXBLChildNodesFor(aNode), "The node should not have any XBL children"); } #endif // Set the flag on the node itself aNode->SetFlags(aFlagsToSet); // Set the flag on all of its children recursively uint32_t count; nsIContent * const *children = aNode->GetChildArray(&count); for (uint32_t index = 0; index < count; ++index) { SetFlagsOnSubtree(children[index], aFlagsToSet); } } nsresult nsCSSFrameConstructor::GetAnonymousContent(nsIContent* aParent, nsIFrame* aParentFrame, nsTArray& aContent) { nsIAnonymousContentCreator* creator = do_QueryFrame(aParentFrame); if (!creator) return NS_OK; nsresult rv = creator->CreateAnonymousContent(aContent); NS_ENSURE_SUCCESS(rv, rv); uint32_t count = aContent.Length(); for (uint32_t i=0; i < count; i++) { // get our child's content and set its parent to our content nsIContent* content = aContent[i].mContent; NS_ASSERTION(content, "null anonymous content?"); // least-surprise CSS binding until we do the SVG specified // cascading rules for - bug 265894 if (aParentFrame->GetType() == nsGkAtoms::svgUseFrame) { content->SetFlags(NODE_IS_ANONYMOUS); } else { content->SetNativeAnonymous(); } bool anonContentIsEditable = content->HasFlag(NODE_IS_EDITABLE); rv = content->BindToTree(mDocument, aParent, aParent, true); // If the anonymous content creator requested that the content should be // editable, honor its request. // We need to set the flag on the whole subtree, because existing // children's flags have already been set as part of the BindToTree operation. if (anonContentIsEditable) { NS_ASSERTION(aParentFrame->GetType() == nsGkAtoms::textInputFrame, "We only expect this for anonymous content under a text control frame"); SetFlagsOnSubtree(content, NODE_IS_EDITABLE); } if (NS_FAILED(rv)) { content->UnbindFromTree(); return rv; } } return NS_OK; } static bool IsXULDisplayType(const nsStyleDisplay* aDisplay) { return (aDisplay->mDisplay == NS_STYLE_DISPLAY_INLINE_BOX || #ifdef MOZ_XUL aDisplay->mDisplay == NS_STYLE_DISPLAY_INLINE_GRID || aDisplay->mDisplay == NS_STYLE_DISPLAY_INLINE_STACK || #endif aDisplay->mDisplay == NS_STYLE_DISPLAY_BOX #ifdef MOZ_XUL || aDisplay->mDisplay == NS_STYLE_DISPLAY_GRID || aDisplay->mDisplay == NS_STYLE_DISPLAY_STACK || aDisplay->mDisplay == NS_STYLE_DISPLAY_GRID_GROUP || aDisplay->mDisplay == NS_STYLE_DISPLAY_GRID_LINE || aDisplay->mDisplay == NS_STYLE_DISPLAY_DECK || aDisplay->mDisplay == NS_STYLE_DISPLAY_POPUP || aDisplay->mDisplay == NS_STYLE_DISPLAY_GROUPBOX #endif ); } // XUL frames are not allowed to be out of flow. #define SIMPLE_XUL_FCDATA(_func) \ FCDATA_DECL(FCDATA_DISALLOW_OUT_OF_FLOW | FCDATA_SKIP_ABSPOS_PUSH, \ _func) #define SCROLLABLE_XUL_FCDATA(_func) \ FCDATA_DECL(FCDATA_DISALLOW_OUT_OF_FLOW | FCDATA_SKIP_ABSPOS_PUSH | \ FCDATA_MAY_NEED_SCROLLFRAME, _func) // .. but we allow some XUL frames to be _containers_ for out-of-flow content // (This is the same as SCROLLABLE_XUL_FCDATA, but w/o FCDATA_SKIP_ABSPOS_PUSH) #define SCROLLABLE_ABSPOS_CONTAINER_XUL_FCDATA(_func) \ FCDATA_DECL(FCDATA_DISALLOW_OUT_OF_FLOW | \ FCDATA_MAY_NEED_SCROLLFRAME, _func) #define SIMPLE_XUL_CREATE(_tag, _func) \ { &nsGkAtoms::_tag, SIMPLE_XUL_FCDATA(_func) } #define SCROLLABLE_XUL_CREATE(_tag, _func) \ { &nsGkAtoms::_tag, SCROLLABLE_XUL_FCDATA(_func) } #define SIMPLE_XUL_INT_CREATE(_int, _func) \ { _int, SIMPLE_XUL_FCDATA(_func) } #define SCROLLABLE_XUL_INT_CREATE(_int, _func) \ { _int, SCROLLABLE_XUL_FCDATA(_func) } #define SCROLLABLE_ABSPOS_CONTAINER_XUL_INT_CREATE(_int, _func) \ { _int, SCROLLABLE_ABSPOS_CONTAINER_XUL_FCDATA(_func) } static nsIFrame* NS_NewGridBoxFrame(nsIPresShell* aPresShell, nsStyleContext* aStyleContext) { nsCOMPtr layout; NS_NewGridLayout2(aPresShell, getter_AddRefs(layout)); if (!layout) { return nullptr; } return NS_NewBoxFrame(aPresShell, aStyleContext, false, layout); } /* static */ const nsCSSFrameConstructor::FrameConstructionData* nsCSSFrameConstructor::FindXULTagData(Element* aElement, nsIAtom* aTag, int32_t aNameSpaceID, nsStyleContext* aStyleContext) { if (aNameSpaceID != kNameSpaceID_XUL) { return nullptr; } static const FrameConstructionDataByTag sXULTagData[] = { #ifdef MOZ_XUL SCROLLABLE_XUL_CREATE(button, NS_NewButtonBoxFrame), SCROLLABLE_XUL_CREATE(checkbox, NS_NewButtonBoxFrame), SCROLLABLE_XUL_CREATE(radio, NS_NewButtonBoxFrame), SCROLLABLE_XUL_CREATE(autorepeatbutton, NS_NewAutoRepeatBoxFrame), SCROLLABLE_XUL_CREATE(titlebar, NS_NewTitleBarFrame), SCROLLABLE_XUL_CREATE(resizer, NS_NewResizerFrame), SIMPLE_XUL_CREATE(image, NS_NewImageBoxFrame), SIMPLE_XUL_CREATE(spring, NS_NewLeafBoxFrame), SIMPLE_XUL_CREATE(spacer, NS_NewLeafBoxFrame), SIMPLE_XUL_CREATE(treechildren, NS_NewTreeBodyFrame), SIMPLE_XUL_CREATE(treecol, NS_NewTreeColFrame), SIMPLE_XUL_CREATE(text, NS_NewTextBoxFrame), SIMPLE_TAG_CHAIN(label, nsCSSFrameConstructor::FindXULLabelData), SIMPLE_TAG_CHAIN(description, nsCSSFrameConstructor::FindXULDescriptionData), SIMPLE_XUL_CREATE(menu, NS_NewMenuFrame), SIMPLE_XUL_CREATE(menubutton, NS_NewMenuFrame), SIMPLE_XUL_CREATE(menuitem, NS_NewMenuItemFrame), #ifdef XP_MACOSX SIMPLE_TAG_CHAIN(menubar, nsCSSFrameConstructor::FindXULMenubarData), #else SIMPLE_XUL_CREATE(menubar, NS_NewMenuBarFrame), #endif /* XP_MACOSX */ SIMPLE_TAG_CHAIN(popupgroup, nsCSSFrameConstructor::FindPopupGroupData), SIMPLE_XUL_CREATE(iframe, NS_NewSubDocumentFrame), SIMPLE_XUL_CREATE(editor, NS_NewSubDocumentFrame), SIMPLE_XUL_CREATE(browser, NS_NewSubDocumentFrame), SIMPLE_XUL_CREATE(progressmeter, NS_NewProgressMeterFrame), SIMPLE_XUL_CREATE(splitter, NS_NewSplitterFrame), SIMPLE_TAG_CHAIN(listboxbody, nsCSSFrameConstructor::FindXULListBoxBodyData), SIMPLE_TAG_CHAIN(listitem, nsCSSFrameConstructor::FindXULListItemData), #endif /* MOZ_XUL */ SIMPLE_XUL_CREATE(slider, NS_NewSliderFrame), SIMPLE_XUL_CREATE(scrollbar, NS_NewScrollbarFrame), SIMPLE_XUL_CREATE(scrollbarbutton, NS_NewScrollbarButtonFrame) }; return FindDataByTag(aTag, aElement, aStyleContext, sXULTagData, ArrayLength(sXULTagData)); } #ifdef MOZ_XUL /* static */ const nsCSSFrameConstructor::FrameConstructionData* nsCSSFrameConstructor::FindPopupGroupData(Element* aElement, nsStyleContext* /* unused */) { if (!aElement->IsRootOfNativeAnonymousSubtree()) { return nullptr; } static const FrameConstructionData sPopupSetData = SIMPLE_XUL_FCDATA(NS_NewPopupSetFrame); return &sPopupSetData; } /* static */ const nsCSSFrameConstructor::FrameConstructionData nsCSSFrameConstructor::sXULTextBoxData = SIMPLE_XUL_FCDATA(NS_NewTextBoxFrame); /* static */ const nsCSSFrameConstructor::FrameConstructionData* nsCSSFrameConstructor::FindXULLabelData(Element* aElement, nsStyleContext* /* unused */) { if (aElement->HasAttr(kNameSpaceID_None, nsGkAtoms::value)) { return &sXULTextBoxData; } static const FrameConstructionData sLabelData = SIMPLE_XUL_FCDATA(NS_NewXULLabelFrame); return &sLabelData; } static nsIFrame* NS_NewXULDescriptionFrame(nsIPresShell* aPresShell, nsStyleContext *aContext) { // XXXbz do we really need to set those flags? If the parent is not // a block we'll get them anyway, and if it is, do we want them? return NS_NewBlockFrame(aPresShell, aContext, NS_BLOCK_FLOAT_MGR | NS_BLOCK_MARGIN_ROOT); } /* static */ const nsCSSFrameConstructor::FrameConstructionData* nsCSSFrameConstructor::FindXULDescriptionData(Element* aElement, nsStyleContext* /* unused */) { if (aElement->HasAttr(kNameSpaceID_None, nsGkAtoms::value)) { return &sXULTextBoxData; } static const FrameConstructionData sDescriptionData = SIMPLE_XUL_FCDATA(NS_NewXULDescriptionFrame); return &sDescriptionData; } #ifdef XP_MACOSX /* static */ const nsCSSFrameConstructor::FrameConstructionData* nsCSSFrameConstructor::FindXULMenubarData(Element* aElement, nsStyleContext* aStyleContext) { nsCOMPtr container = aStyleContext->PresContext()->GetContainer(); if (container) { nsCOMPtr treeItem(do_QueryInterface(container)); if (treeItem) { int32_t type; treeItem->GetItemType(&type); if (nsIDocShellTreeItem::typeChrome == type) { nsCOMPtr parent; treeItem->GetParent(getter_AddRefs(parent)); if (!parent) { // This is the root. Suppress the menubar, since on Mac // window menus are not attached to the window. static const FrameConstructionData sSuppressData = SUPPRESS_FCDATA(); return &sSuppressData; } } } } static const FrameConstructionData sMenubarData = SIMPLE_XUL_FCDATA(NS_NewMenuBarFrame); return &sMenubarData; } #endif /* XP_MACOSX */ /* static */ const nsCSSFrameConstructor::FrameConstructionData* nsCSSFrameConstructor::FindXULListBoxBodyData(Element* aElement, nsStyleContext* aStyleContext) { if (aStyleContext->GetStyleDisplay()->mDisplay != NS_STYLE_DISPLAY_GRID_GROUP) { return nullptr; } static const FrameConstructionData sListBoxBodyData = SCROLLABLE_XUL_FCDATA(NS_NewListBoxBodyFrame); return &sListBoxBodyData; } /* static */ const nsCSSFrameConstructor::FrameConstructionData* nsCSSFrameConstructor::FindXULListItemData(Element* aElement, nsStyleContext* aStyleContext) { if (aStyleContext->GetStyleDisplay()->mDisplay != NS_STYLE_DISPLAY_GRID_LINE) { return nullptr; } static const FrameConstructionData sListItemData = SCROLLABLE_XUL_FCDATA(NS_NewListItemFrame); return &sListItemData; } #endif /* MOZ_XUL */ /* static */ const nsCSSFrameConstructor::FrameConstructionData* nsCSSFrameConstructor::FindXULDisplayData(const nsStyleDisplay* aDisplay, Element* aElement, nsStyleContext* aStyleContext) { static const FrameConstructionDataByInt sXULDisplayData[] = { SCROLLABLE_ABSPOS_CONTAINER_XUL_INT_CREATE(NS_STYLE_DISPLAY_INLINE_BOX, NS_NewBoxFrame), SCROLLABLE_ABSPOS_CONTAINER_XUL_INT_CREATE(NS_STYLE_DISPLAY_BOX, NS_NewBoxFrame), #ifdef MOZ_XUL SCROLLABLE_XUL_INT_CREATE(NS_STYLE_DISPLAY_INLINE_GRID, NS_NewGridBoxFrame), SCROLLABLE_XUL_INT_CREATE(NS_STYLE_DISPLAY_GRID, NS_NewGridBoxFrame), SCROLLABLE_XUL_INT_CREATE(NS_STYLE_DISPLAY_GRID_GROUP, NS_NewGridRowGroupFrame), SCROLLABLE_XUL_INT_CREATE(NS_STYLE_DISPLAY_GRID_LINE, NS_NewGridRowLeafFrame), SIMPLE_XUL_INT_CREATE(NS_STYLE_DISPLAY_DECK, NS_NewDeckFrame), SCROLLABLE_XUL_INT_CREATE(NS_STYLE_DISPLAY_GROUPBOX, NS_NewGroupBoxFrame), SCROLLABLE_XUL_INT_CREATE(NS_STYLE_DISPLAY_INLINE_STACK, NS_NewStackFrame), SCROLLABLE_XUL_INT_CREATE(NS_STYLE_DISPLAY_STACK, NS_NewStackFrame), { NS_STYLE_DISPLAY_POPUP, FCDATA_DECL(FCDATA_DISALLOW_OUT_OF_FLOW | FCDATA_IS_POPUP | FCDATA_SKIP_ABSPOS_PUSH, NS_NewMenuPopupFrame) } #endif /* MOZ_XUL */ }; // Processing by display here: return FindDataByInt(aDisplay->mDisplay, aElement, aStyleContext, sXULDisplayData, ArrayLength(sXULDisplayData)); } already_AddRefed nsCSSFrameConstructor::BeginBuildingScrollFrame(nsFrameConstructorState& aState, nsIContent* aContent, nsStyleContext* aContentStyle, nsIFrame* aParentFrame, nsIAtom* aScrolledPseudo, bool aIsRoot, nsIFrame*& aNewFrame) { nsIFrame* gfxScrollFrame = aNewFrame; nsFrameItems anonymousItems; nsRefPtr contentStyle = aContentStyle; if (!gfxScrollFrame) { // Build a XULScrollFrame when the child is a box, otherwise an // HTMLScrollFrame // XXXbz this is the lone remaining consumer of IsXULDisplayType. // I wonder whether we can eliminate that somehow. if (IsXULDisplayType(aContentStyle->GetStyleDisplay())) { gfxScrollFrame = NS_NewXULScrollFrame(mPresShell, contentStyle, aIsRoot); } else { gfxScrollFrame = NS_NewHTMLScrollFrame(mPresShell, contentStyle, aIsRoot); } InitAndRestoreFrame(aState, aContent, aParentFrame, nullptr, gfxScrollFrame); } // if there are any anonymous children for the scroll frame, create // frames for them. // Pass a null pending binding: we don't care how constructors for any of // this anonymous content order with anything else. It's never been // consistent anyway. CreateAnonymousFrames(aState, aContent, gfxScrollFrame, nullptr, anonymousItems); aNewFrame = gfxScrollFrame; // we used the style that was passed in. So resolve another one. nsStyleSet *styleSet = mPresShell->StyleSet(); nsStyleContext* aScrolledChildStyle = styleSet->ResolveAnonymousBoxStyle(aScrolledPseudo, contentStyle).get(); if (gfxScrollFrame) { gfxScrollFrame->SetInitialChildList(kPrincipalList, anonymousItems); } return aScrolledChildStyle; } void nsCSSFrameConstructor::FinishBuildingScrollFrame(nsIFrame* aScrollFrame, nsIFrame* aScrolledFrame) { nsFrameList scrolled(aScrolledFrame, aScrolledFrame); aScrollFrame->AppendFrames(kPrincipalList, scrolled); } /** * Called to wrap a gfx scrollframe around a frame. The hierarchy will look like this * * ------- for gfx scrollbars ------ * * * ScrollFrame * ^ * | * Frame (scrolled frame you passed in) * * *----------------------------------- * LEGEND: * * ScrollFrame: This is a frame that manages gfx cross platform frame based scrollbars. * * @param aContent the content node of the child to wrap. * @param aScrolledFrame The frame of the content to wrap. This should not be * Initialized. This method will initialize it with a scrolled pseudo * and no nsIContent. The content will be attached to the scrollframe * returned. * @param aContentStyle the style context that has already been resolved for the content being passed in. * * @param aParentFrame The parent to attach the scroll frame to * * @param aNewFrame The new scrollframe or gfx scrollframe that we create. It will contain the * scrolled frame you passed in. (returned) * If this is not null, we'll just use it * @param aScrolledContentStyle the style that was resolved for the scrolled frame. (returned) */ nsresult nsCSSFrameConstructor::BuildScrollFrame(nsFrameConstructorState& aState, nsIContent* aContent, nsStyleContext* aContentStyle, nsIFrame* aScrolledFrame, nsIFrame* aParentFrame, nsIFrame*& aNewFrame) { nsRefPtr scrolledContentStyle = BeginBuildingScrollFrame(aState, aContent, aContentStyle, aParentFrame, nsCSSAnonBoxes::scrolledContent, false, aNewFrame); aScrolledFrame->SetStyleContextWithoutNotification(scrolledContentStyle); InitAndRestoreFrame(aState, aContent, aNewFrame, nullptr, aScrolledFrame); FinishBuildingScrollFrame(aNewFrame, aScrolledFrame); return NS_OK; } const nsCSSFrameConstructor::FrameConstructionData* nsCSSFrameConstructor::FindDisplayData(const nsStyleDisplay* aDisplay, Element* aElement, nsIFrame* aParentFrame, nsStyleContext* aStyleContext) { PR_STATIC_ASSERT(eParentTypeCount < (1 << (32 - FCDATA_PARENT_TYPE_OFFSET))); // The style system ensures that floated and positioned frames are // block-level. NS_ASSERTION(!(aDisplay->IsFloatingStyle() || aDisplay->IsAbsolutelyPositionedStyle()) || aDisplay->IsBlockOutsideStyle(), "Style system did not apply CSS2.1 section 9.7 fixups"); // If this is "body", try propagating its scroll style to the viewport // Note that we need to do this even if the body is NOT scrollable; // it might have dynamically changed from scrollable to not scrollable, // and that might need to be propagated. // XXXbz is this the right place to do this? If this code moves, // make this function static. bool propagatedScrollToViewport = false; if (aElement->IsHTML(nsGkAtoms::body)) { propagatedScrollToViewport = PropagateScrollToViewport() == aElement; } NS_ASSERTION(!propagatedScrollToViewport || !mPresShell->GetPresContext()->IsPaginated(), "Shouldn't propagate scroll in paginated contexts"); // If the frame is a block-level frame and is scrollable, then wrap it in a // scroll frame. // XXX Ignore tables for the time being // XXXbz it would be nice to combine this with the other block // case... Think about how do do this? if ((aParentFrame ? aDisplay->IsBlockInside(aParentFrame) : aDisplay->IsBlockInsideStyle()) && aDisplay->IsScrollableOverflow() && !propagatedScrollToViewport) { // Except we don't want to do that for paginated contexts for // frames that are block-outside and aren't frames for native // anonymous stuff. if (mPresShell->GetPresContext()->IsPaginated() && aDisplay->IsBlockOutsideStyle() && !aElement->IsInNativeAnonymousSubtree()) { static const FrameConstructionData sForcedNonScrollableBlockData = FULL_CTOR_FCDATA(FCDATA_FORCED_NON_SCROLLABLE_BLOCK, &nsCSSFrameConstructor::ConstructNonScrollableBlock); return &sForcedNonScrollableBlockData; } static const FrameConstructionData sScrollableBlockData = FULL_CTOR_FCDATA(0, &nsCSSFrameConstructor::ConstructScrollableBlock); return &sScrollableBlockData; } // Handle various non-scrollable blocks if ((aParentFrame ? aDisplay->IsBlockInside(aParentFrame) : aDisplay->IsBlockInsideStyle())) { static const FrameConstructionData sNonScrollableBlockData = FULL_CTOR_FCDATA(0, &nsCSSFrameConstructor::ConstructNonScrollableBlock); return &sNonScrollableBlockData; } static const FrameConstructionDataByInt sDisplayData[] = { // To keep the hash table small don't add inline frames (they're // typically things like FONT and B), because we can quickly // find them if we need to. // XXXbz the "quickly" part is a bald-faced lie! { NS_STYLE_DISPLAY_INLINE, FULL_CTOR_FCDATA(FCDATA_IS_INLINE | FCDATA_IS_LINE_PARTICIPANT, &nsCSSFrameConstructor::ConstructInline) }, #ifdef MOZ_FLEXBOX { NS_STYLE_DISPLAY_FLEX, FCDATA_DECL(0, NS_NewFlexContainerFrame) }, { NS_STYLE_DISPLAY_INLINE_FLEX, FCDATA_DECL(0, NS_NewFlexContainerFrame) }, #endif // MOZ_FLEXBOX { NS_STYLE_DISPLAY_TABLE, FULL_CTOR_FCDATA(0, &nsCSSFrameConstructor::ConstructTable) }, { NS_STYLE_DISPLAY_INLINE_TABLE, FULL_CTOR_FCDATA(0, &nsCSSFrameConstructor::ConstructTable) }, { NS_STYLE_DISPLAY_TABLE_CAPTION, FCDATA_DECL(FCDATA_IS_TABLE_PART | FCDATA_ALLOW_BLOCK_STYLES | FCDATA_DISALLOW_OUT_OF_FLOW | FCDATA_SKIP_ABSPOS_PUSH | FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeTable), NS_NewTableCaptionFrame) }, { NS_STYLE_DISPLAY_TABLE_ROW_GROUP, FCDATA_DECL(FCDATA_IS_TABLE_PART | FCDATA_DISALLOW_OUT_OF_FLOW | FCDATA_SKIP_ABSPOS_PUSH | FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeTable), NS_NewTableRowGroupFrame) }, { NS_STYLE_DISPLAY_TABLE_HEADER_GROUP, FCDATA_DECL(FCDATA_IS_TABLE_PART | FCDATA_DISALLOW_OUT_OF_FLOW | FCDATA_SKIP_ABSPOS_PUSH | FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeTable), NS_NewTableRowGroupFrame) }, { NS_STYLE_DISPLAY_TABLE_FOOTER_GROUP, FCDATA_DECL(FCDATA_IS_TABLE_PART | FCDATA_DISALLOW_OUT_OF_FLOW | FCDATA_SKIP_ABSPOS_PUSH | FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeTable), NS_NewTableRowGroupFrame) }, { NS_STYLE_DISPLAY_TABLE_COLUMN_GROUP, FCDATA_DECL(FCDATA_IS_TABLE_PART | FCDATA_DISALLOW_OUT_OF_FLOW | FCDATA_SKIP_ABSPOS_PUSH | FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeTable), NS_NewTableColGroupFrame) }, { NS_STYLE_DISPLAY_TABLE_COLUMN, FULL_CTOR_FCDATA(FCDATA_IS_TABLE_PART | FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeColGroup), &nsCSSFrameConstructor::ConstructTableCol) }, { NS_STYLE_DISPLAY_TABLE_ROW, FULL_CTOR_FCDATA(FCDATA_IS_TABLE_PART | FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeRowGroup), &nsCSSFrameConstructor::ConstructTableRow) }, { NS_STYLE_DISPLAY_TABLE_CELL, FULL_CTOR_FCDATA(FCDATA_IS_TABLE_PART | FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeRow), &nsCSSFrameConstructor::ConstructTableCell) } }; return FindDataByInt((aParentFrame ? aDisplay->GetDisplay(aParentFrame) : aDisplay->mDisplay), aElement, aStyleContext, sDisplayData, ArrayLength(sDisplayData)); } nsresult nsCSSFrameConstructor::ConstructScrollableBlock(nsFrameConstructorState& aState, FrameConstructionItem& aItem, nsIFrame* aParentFrame, const nsStyleDisplay* aDisplay, nsFrameItems& aFrameItems, nsIFrame** aNewFrame) { nsIContent* const content = aItem.mContent; nsStyleContext* const styleContext = aItem.mStyleContext; *aNewFrame = nullptr; nsRefPtr scrolledContentStyle = BeginBuildingScrollFrame(aState, content, styleContext, aState.GetGeometricParent(aDisplay, aParentFrame), nsCSSAnonBoxes::scrolledContent, false, *aNewFrame); // Create our block frame // pass a temporary stylecontext, the correct one will be set later nsIFrame* scrolledFrame = NS_NewBlockFormattingContext(mPresShell, styleContext); nsFrameItems blockItem; nsresult rv = ConstructBlock(aState, scrolledContentStyle->GetStyleDisplay(), content, *aNewFrame, *aNewFrame, scrolledContentStyle, &scrolledFrame, blockItem, aDisplay->IsPositioned(scrolledFrame), aItem.mPendingBinding); if (NS_UNLIKELY(NS_FAILED(rv))) { // XXXbz any cleanup needed here? return rv; } NS_ASSERTION(blockItem.FirstChild() == scrolledFrame, "Scrollframe's frameItems should be exactly the scrolled frame"); FinishBuildingScrollFrame(*aNewFrame, scrolledFrame); rv = aState.AddChild(*aNewFrame, aFrameItems, content, styleContext, aParentFrame); return rv; } nsresult nsCSSFrameConstructor::ConstructNonScrollableBlock(nsFrameConstructorState& aState, FrameConstructionItem& aItem, nsIFrame* aParentFrame, const nsStyleDisplay* aDisplay, nsFrameItems& aFrameItems, nsIFrame** aNewFrame) { nsStyleContext* const styleContext = aItem.mStyleContext; // We want a block formatting context root in paginated contexts for // every block that would be scrollable in a non-paginated context. // We mark our blocks with a bit here if this condition is true, so // we can check it later in nsFrame::ApplyPaginatedOverflowClipping. bool clipPaginatedOverflow = (aItem.mFCData->mBits & FCDATA_FORCED_NON_SCROLLABLE_BLOCK) != 0; if ((aDisplay->IsAbsolutelyPositionedStyle() || aDisplay->IsFloatingStyle() || NS_STYLE_DISPLAY_INLINE_BLOCK == aDisplay->mDisplay || clipPaginatedOverflow) && !aParentFrame->IsSVGText()) { *aNewFrame = NS_NewBlockFormattingContext(mPresShell, styleContext); if (clipPaginatedOverflow) { (*aNewFrame)->AddStateBits(NS_BLOCK_CLIP_PAGINATED_OVERFLOW); } } else { *aNewFrame = NS_NewBlockFrame(mPresShell, styleContext); } return ConstructBlock(aState, aDisplay, aItem.mContent, aState.GetGeometricParent(aDisplay, aParentFrame), aParentFrame, styleContext, aNewFrame, aFrameItems, aDisplay->IsPositioned(*aNewFrame), aItem.mPendingBinding); } nsresult nsCSSFrameConstructor::InitAndRestoreFrame(const nsFrameConstructorState& aState, nsIContent* aContent, nsIFrame* aParentFrame, nsIFrame* aPrevInFlow, nsIFrame* aNewFrame, bool aAllowCounters) { NS_PRECONDITION(mUpdateCount != 0, "Should be in an update while creating frames"); nsresult rv = NS_OK; NS_ASSERTION(aNewFrame, "Null frame cannot be initialized"); if (!aNewFrame) return NS_ERROR_NULL_POINTER; // Initialize the frame rv = aNewFrame->Init(aContent, aParentFrame, aPrevInFlow); aNewFrame->AddStateBits(aState.mAdditionalStateBits); if (aState.mFrameState) { // Restore frame state for just the newly created frame. RestoreFrameStateFor(aNewFrame, aState.mFrameState); } if (aAllowCounters && !aPrevInFlow && mCounterManager.AddCounterResetsAndIncrements(aNewFrame)) { CountersDirty(); } return rv; } already_AddRefed nsCSSFrameConstructor::ResolveStyleContext(nsIFrame* aParentFrame, nsIContent* aContent, nsFrameConstructorState* aState) { nsStyleContext* parentStyleContext = nullptr; NS_ASSERTION(aContent->GetParent(), "Must have parent here"); aParentFrame = nsFrame::CorrectStyleParentFrame(aParentFrame, nullptr); if (aParentFrame) { // Resolve the style context based on the content object and the parent // style context parentStyleContext = aParentFrame->GetStyleContext(); } else { // Perhaps aParentFrame is a canvasFrame and we're replicating // fixed-pos frames. // XXX should we create a way to tell ConstructFrame which style // context to use, and pass it the style context for the // previous page's fixed-pos frame? } return ResolveStyleContext(parentStyleContext, aContent, aState); } already_AddRefed nsCSSFrameConstructor::ResolveStyleContext(nsStyleContext* aParentStyleContext, nsIContent* aContent, nsFrameConstructorState* aState) { nsStyleSet *styleSet = mPresShell->StyleSet(); aContent->OwnerDoc()->FlushPendingLinkUpdates(); if (aContent->IsElement()) { if (aState) { return styleSet->ResolveStyleFor(aContent->AsElement(), aParentStyleContext, aState->mTreeMatchContext); } return styleSet->ResolveStyleFor(aContent->AsElement(), aParentStyleContext); } NS_ASSERTION(aContent->IsNodeOfType(nsINode::eTEXT), "shouldn't waste time creating style contexts for " "comments and processing instructions"); return styleSet->ResolveStyleForNonElement(aParentStyleContext); } // MathML Mod - RBS nsresult nsCSSFrameConstructor::FlushAccumulatedBlock(nsFrameConstructorState& aState, nsIContent* aContent, nsIFrame* aParentFrame, nsFrameItems& aBlockItems, nsFrameItems& aNewItems) { if (aBlockItems.IsEmpty()) { // Nothing to do return NS_OK; } nsIAtom* anonPseudo = nsCSSAnonBoxes::mozMathMLAnonymousBlock; nsStyleContext* parentContext = nsFrame::CorrectStyleParentFrame(aParentFrame, anonPseudo)->GetStyleContext(); nsStyleSet* styleSet = mPresShell->StyleSet(); nsRefPtr blockContext; blockContext = styleSet-> ResolveAnonymousBoxStyle(anonPseudo, parentContext); // then, create a block frame that will wrap the child frames. Make it a // MathML frame so that Get(Absolute/Float)ContainingBlockFor know that this // is not a suitable block. nsIFrame* blockFrame = NS_NewMathMLmathBlockFrame(mPresShell, blockContext, NS_BLOCK_FLOAT_MGR | NS_BLOCK_MARGIN_ROOT); if (NS_UNLIKELY(!blockFrame)) return NS_ERROR_OUT_OF_MEMORY; InitAndRestoreFrame(aState, aContent, aParentFrame, nullptr, blockFrame); ReparentFrames(this, blockFrame, aBlockItems); // abs-pos and floats are disabled in MathML children so we don't have to // worry about messing up those. blockFrame->SetInitialChildList(kPrincipalList, aBlockItems); NS_ASSERTION(aBlockItems.IsEmpty(), "What happened?"); aBlockItems.Clear(); aNewItems.AddChild(blockFrame); return NS_OK; } // Only elements can be floated or positioned. All other MathML // should be in-flow. #define SIMPLE_MATHML_CREATE(_tag, _func) \ { &nsGkAtoms::_tag, \ FCDATA_DECL(FCDATA_DISALLOW_OUT_OF_FLOW | \ FCDATA_FORCE_NULL_ABSPOS_CONTAINER | \ FCDATA_WRAP_KIDS_IN_BLOCKS, _func) } /* static */ const nsCSSFrameConstructor::FrameConstructionData* nsCSSFrameConstructor::FindMathMLData(Element* aElement, nsIAtom* aTag, int32_t aNameSpaceID, nsStyleContext* aStyleContext) { // Make sure that we remain confined in the MathML world if (aNameSpaceID != kNameSpaceID_MathML) return nullptr; // Handle specially, because it sometimes produces inlines if (aTag == nsGkAtoms::math) { // This needs to match the test in EnsureBlockDisplay in // nsRuleNode.cpp. Though the behavior here for the display:table // case is pretty weird... if (aStyleContext->GetStyleDisplay()->IsBlockOutsideStyle()) { static const FrameConstructionData sBlockMathData = FCDATA_DECL(FCDATA_FORCE_NULL_ABSPOS_CONTAINER | FCDATA_WRAP_KIDS_IN_BLOCKS, NS_CreateNewMathMLmathBlockFrame); return &sBlockMathData; } static const FrameConstructionData sInlineMathData = FCDATA_DECL(FCDATA_FORCE_NULL_ABSPOS_CONTAINER | FCDATA_IS_LINE_PARTICIPANT | FCDATA_WRAP_KIDS_IN_BLOCKS, NS_NewMathMLmathInlineFrame); return &sInlineMathData; } static const FrameConstructionDataByTag sMathMLData[] = { SIMPLE_MATHML_CREATE(mi_, NS_NewMathMLTokenFrame), SIMPLE_MATHML_CREATE(mn_, NS_NewMathMLTokenFrame), SIMPLE_MATHML_CREATE(ms_, NS_NewMathMLTokenFrame), SIMPLE_MATHML_CREATE(mtext_, NS_NewMathMLTokenFrame), SIMPLE_MATHML_CREATE(mo_, NS_NewMathMLmoFrame), SIMPLE_MATHML_CREATE(mfrac_, NS_NewMathMLmfracFrame), SIMPLE_MATHML_CREATE(msup_, NS_NewMathMLmsupFrame), SIMPLE_MATHML_CREATE(msub_, NS_NewMathMLmsubFrame), SIMPLE_MATHML_CREATE(msubsup_, NS_NewMathMLmsubsupFrame), SIMPLE_MATHML_CREATE(munder_, NS_NewMathMLmunderoverFrame), SIMPLE_MATHML_CREATE(mover_, NS_NewMathMLmunderoverFrame), SIMPLE_MATHML_CREATE(munderover_, NS_NewMathMLmunderoverFrame), SIMPLE_MATHML_CREATE(mphantom_, NS_NewMathMLmphantomFrame), SIMPLE_MATHML_CREATE(mpadded_, NS_NewMathMLmpaddedFrame), SIMPLE_MATHML_CREATE(mspace_, NS_NewMathMLmspaceFrame), SIMPLE_MATHML_CREATE(none, NS_NewMathMLmspaceFrame), SIMPLE_MATHML_CREATE(mprescripts_, NS_NewMathMLmspaceFrame), SIMPLE_MATHML_CREATE(mfenced_, NS_NewMathMLmfencedFrame), SIMPLE_MATHML_CREATE(mmultiscripts_, NS_NewMathMLmmultiscriptsFrame), SIMPLE_MATHML_CREATE(mstyle_, NS_NewMathMLmstyleFrame), SIMPLE_MATHML_CREATE(msqrt_, NS_NewMathMLmsqrtFrame), SIMPLE_MATHML_CREATE(mroot_, NS_NewMathMLmrootFrame), SIMPLE_MATHML_CREATE(maction_, NS_NewMathMLmactionFrame), SIMPLE_MATHML_CREATE(mrow_, NS_NewMathMLmrowFrame), SIMPLE_MATHML_CREATE(merror_, NS_NewMathMLmrowFrame), SIMPLE_MATHML_CREATE(menclose_, NS_NewMathMLmencloseFrame), SIMPLE_MATHML_CREATE(semantics_, NS_NewMathMLsemanticsFrame) }; return FindDataByTag(aTag, aElement, aStyleContext, sMathMLData, ArrayLength(sMathMLData)); } // Construct an nsSVGOuterSVGFrame, the anonymous child that wraps its real // children, and its descendant frames. nsresult nsCSSFrameConstructor::ConstructOuterSVG(nsFrameConstructorState& aState, FrameConstructionItem& aItem, nsIFrame* aParentFrame, const nsStyleDisplay* aDisplay, nsFrameItems& aFrameItems, nsIFrame** aNewFrame) { nsIContent* const content = aItem.mContent; nsStyleContext* const styleContext = aItem.mStyleContext; nsresult rv = NS_OK; // Create the nsSVGOuterSVGFrame: nsIFrame* newFrame = NS_NewSVGOuterSVGFrame(mPresShell, styleContext); nsIFrame* geometricParent = aState.GetGeometricParent(styleContext->GetStyleDisplay(), aParentFrame); InitAndRestoreFrame(aState, content, geometricParent, nullptr, newFrame); // Create the pseudo SC for the anonymous wrapper child as a child of the SC: nsRefPtr scForAnon; scForAnon = mPresShell->StyleSet()-> ResolveAnonymousBoxStyle(nsCSSAnonBoxes::mozSVGOuterSVGAnonChild, styleContext); // Create the anonymous inner wrapper frame nsIFrame* innerFrame = NS_NewSVGOuterSVGAnonChildFrame(mPresShell, scForAnon); if (!innerFrame) { newFrame->Destroy(); return NS_ERROR_OUT_OF_MEMORY; } InitAndRestoreFrame(aState, content, newFrame, nullptr, innerFrame); // Put the newly created frames into the right child list SetInitialSingleChild(newFrame, innerFrame); rv = aState.AddChild(newFrame, aFrameItems, content, styleContext, aParentFrame); if (NS_FAILED(rv)) { return rv; } if (!mRootElementFrame) { // The frame we're constructing will be the root element frame. // Set mRootElementFrame before processing children. mRootElementFrame = newFrame; } nsFrameItems childItems; // Process children if (aItem.mFCData->mBits & FCDATA_USE_CHILD_ITEMS) { rv = ConstructFramesFromItemList(aState, aItem.mChildItems, innerFrame, childItems); } else { rv = ProcessChildren(aState, content, styleContext, innerFrame, true, childItems, false, aItem.mPendingBinding); } // XXXbz what about cleaning up? if (NS_FAILED(rv)) return rv; // Set the inner wrapper frame's initial primary list innerFrame->SetInitialChildList(kPrincipalList, childItems); *aNewFrame = newFrame; return rv; } // Only outer elements can be floated or positioned. All other SVG // should be in-flow. #define SIMPLE_SVG_FCDATA(_func) \ FCDATA_DECL(FCDATA_DISALLOW_OUT_OF_FLOW | \ FCDATA_SKIP_ABSPOS_PUSH | \ FCDATA_DISALLOW_GENERATED_CONTENT, _func) #define SIMPLE_SVG_CREATE(_tag, _func) \ { &nsGkAtoms::_tag, SIMPLE_SVG_FCDATA(_func) } static bool IsFilterPrimitiveChildTag(const nsIAtom* aTag) { return aTag == nsGkAtoms::feDistantLight || aTag == nsGkAtoms::fePointLight || aTag == nsGkAtoms::feSpotLight || aTag == nsGkAtoms::feFuncR || aTag == nsGkAtoms::feFuncG || aTag == nsGkAtoms::feFuncB || aTag == nsGkAtoms::feFuncA || aTag == nsGkAtoms::feMergeNode; } /* static */ const nsCSSFrameConstructor::FrameConstructionData* nsCSSFrameConstructor::FindSVGData(Element* aElement, nsIAtom* aTag, int32_t aNameSpaceID, nsIFrame* aParentFrame, nsStyleContext* aStyleContext) { if (aNameSpaceID != kNameSpaceID_SVG) { return nullptr; } static const FrameConstructionData sSuppressData = SUPPRESS_FCDATA(); static const FrameConstructionData sContainerData = SIMPLE_SVG_FCDATA(NS_NewSVGContainerFrame); bool parentIsSVG = false; nsIContent* parentContent = aParentFrame ? aParentFrame->GetContent() : nullptr; // XXXbz should this really be based on the XBL-resolved tag of the parent // frame's content? Should it not be based on the type of the parent frame // (e.g. whether it's an SVG frame)? if (parentContent) { int32_t parentNSID; nsIAtom* parentTag = parentContent->OwnerDoc()->BindingManager()-> ResolveTag(parentContent, &parentNSID); // It's not clear whether the SVG spec intends to allow any SVG // content within svg:foreignObject at all (SVG 1.1, section // 23.2), but if it does, it better be svg:svg. So given that // we're allowing it, treat it as a non-SVG parent. parentIsSVG = parentNSID == kNameSpaceID_SVG && parentTag != nsGkAtoms::foreignObject; } if ((aTag != nsGkAtoms::svg && !parentIsSVG) || (aTag == nsGkAtoms::desc || aTag == nsGkAtoms::title)) { // Sections 5.1 and G.4 of SVG 1.1 say that SVG elements other than // svg:svg not contained within svg:svg are incorrect, although they // don't seem to specify error handling. Ignore them, since many of // our frame classes can't deal. It *may* be that the document // should at that point be considered in error according to F.2, but // it's hard to tell. // // Style mutation can't change this situation, so don't bother // adding to the undisplayed content map. // // We don't currently handle any UI for desc/title return &sSuppressData; } // We don't need frames for animation elements if (aElement->IsNodeOfType(nsINode::eANIMATION)) { return &sSuppressData; } if (aTag == nsGkAtoms::svg && !parentIsSVG) { // We need outer elements to have an nsSVGOuterSVGFrame regardless // of whether they fail conditional processing attributes, since various // SVG frames assume that one exists. We handle the non-rendering // of failing outer element contents like statements, // and do the PassesConditionalProcessingTests call in // nsSVGOuterSVGFrame::Init. static const FrameConstructionData sOuterSVGData = FULL_CTOR_FCDATA(0, &nsCSSFrameConstructor::ConstructOuterSVG); return &sOuterSVGData; } nsCOMPtr tests(do_QueryInterface(aElement)); if (tests && !tests->PassesConditionalProcessingTests()) { // Elements with failing conditional processing attributes never get // rendered. Note that this is not where we select which frame in a // to render! That happens in nsSVGSwitchFrame::PaintSVG. return &sContainerData; } // Prevent bad frame types being children of filters or parents of filter // primitives: bool parentIsFilter = aParentFrame->GetType() == nsGkAtoms::svgFilterFrame; nsCOMPtr filterPrimitive = do_QueryInterface(aElement); if ((parentIsFilter && !filterPrimitive) || (!parentIsFilter && filterPrimitive)) { return &sSuppressData; } // Prevent bad frame types being children of filter primitives or parents of // filter primitive children: bool parentIsFEContainerFrame = aParentFrame->GetType() == nsGkAtoms::svgFEContainerFrame; if ((parentIsFEContainerFrame && !IsFilterPrimitiveChildTag(aTag)) || (!parentIsFEContainerFrame && IsFilterPrimitiveChildTag(aTag))) { return &sSuppressData; } // Special cases for text/tspan/textPath, because the kind of frame // they get depends on the parent frame. We ignore 'a' elements when // determining the parent, however. nsIFrame *ancestorFrame = nsSVGUtils::GetFirstNonAAncestorFrame(aParentFrame); if (ancestorFrame) { if (aTag == nsGkAtoms::tspan || aTag == nsGkAtoms::altGlyph) { // tspan and altGlyph must be children of another text content element. nsSVGTextContainerFrame* metrics = do_QueryFrame(ancestorFrame); if (!metrics) { return &sSuppressData; } } else if (aTag == nsGkAtoms::textPath) { // textPath must be a child of text. nsIAtom* ancestorFrameType = ancestorFrame->GetType(); if (ancestorFrameType != nsGkAtoms::svgTextFrame) { return &sSuppressData; } } else if (aTag != nsGkAtoms::a) { // Every other element except 'a' must not be a child of a text content // element. nsSVGTextContainerFrame* metrics = do_QueryFrame(ancestorFrame); if (metrics) { return &sSuppressData; } } } static const FrameConstructionDataByTag sSVGData[] = { SIMPLE_SVG_CREATE(svg, NS_NewSVGInnerSVGFrame), SIMPLE_SVG_CREATE(g, NS_NewSVGGFrame), SIMPLE_SVG_CREATE(svgSwitch, NS_NewSVGSwitchFrame), SIMPLE_SVG_CREATE(polygon, NS_NewSVGPathGeometryFrame), SIMPLE_SVG_CREATE(polyline, NS_NewSVGPathGeometryFrame), SIMPLE_SVG_CREATE(circle, NS_NewSVGPathGeometryFrame), SIMPLE_SVG_CREATE(ellipse, NS_NewSVGPathGeometryFrame), SIMPLE_SVG_CREATE(line, NS_NewSVGPathGeometryFrame), SIMPLE_SVG_CREATE(rect, NS_NewSVGPathGeometryFrame), SIMPLE_SVG_CREATE(path, NS_NewSVGPathGeometryFrame), SIMPLE_SVG_CREATE(defs, NS_NewSVGContainerFrame), SIMPLE_SVG_CREATE(generic_, NS_NewSVGGenericContainerFrame), { &nsGkAtoms::foreignObject, FCDATA_WITH_WRAPPING_BLOCK(FCDATA_DISALLOW_OUT_OF_FLOW, NS_NewSVGForeignObjectFrame, nsCSSAnonBoxes::mozSVGForeignContent) }, SIMPLE_SVG_CREATE(a, NS_NewSVGAFrame), SIMPLE_SVG_CREATE(altGlyph, NS_NewSVGTSpanFrame), SIMPLE_SVG_CREATE(text, NS_NewSVGTextFrame), SIMPLE_SVG_CREATE(tspan, NS_NewSVGTSpanFrame), SIMPLE_SVG_CREATE(linearGradient, NS_NewSVGLinearGradientFrame), SIMPLE_SVG_CREATE(radialGradient, NS_NewSVGRadialGradientFrame), SIMPLE_SVG_CREATE(stop, NS_NewSVGStopFrame), SIMPLE_SVG_CREATE(use, NS_NewSVGUseFrame), SIMPLE_SVG_CREATE(view, NS_NewSVGViewFrame), SIMPLE_SVG_CREATE(marker, NS_NewSVGMarkerFrame), SIMPLE_SVG_CREATE(image, NS_NewSVGImageFrame), SIMPLE_SVG_CREATE(clipPath, NS_NewSVGClipPathFrame), SIMPLE_SVG_CREATE(textPath, NS_NewSVGTextPathFrame), SIMPLE_SVG_CREATE(filter, NS_NewSVGFilterFrame), SIMPLE_SVG_CREATE(pattern, NS_NewSVGPatternFrame), SIMPLE_SVG_CREATE(mask, NS_NewSVGMaskFrame), SIMPLE_SVG_CREATE(feDistantLight, NS_NewSVGFEUnstyledLeafFrame), SIMPLE_SVG_CREATE(fePointLight, NS_NewSVGFEUnstyledLeafFrame), SIMPLE_SVG_CREATE(feSpotLight, NS_NewSVGFEUnstyledLeafFrame), SIMPLE_SVG_CREATE(feBlend, NS_NewSVGFELeafFrame), SIMPLE_SVG_CREATE(feColorMatrix, NS_NewSVGFELeafFrame), SIMPLE_SVG_CREATE(feFuncR, NS_NewSVGFEUnstyledLeafFrame), SIMPLE_SVG_CREATE(feFuncG, NS_NewSVGFEUnstyledLeafFrame), SIMPLE_SVG_CREATE(feFuncB, NS_NewSVGFEUnstyledLeafFrame), SIMPLE_SVG_CREATE(feFuncA, NS_NewSVGFEUnstyledLeafFrame), SIMPLE_SVG_CREATE(feComposite, NS_NewSVGFELeafFrame), SIMPLE_SVG_CREATE(feComponentTransfer, NS_NewSVGFEContainerFrame), SIMPLE_SVG_CREATE(feConvolveMatrix, NS_NewSVGFELeafFrame), SIMPLE_SVG_CREATE(feDiffuseLighting, NS_NewSVGFEContainerFrame), SIMPLE_SVG_CREATE(feDisplacementMap, NS_NewSVGFELeafFrame), SIMPLE_SVG_CREATE(feFlood, NS_NewSVGFELeafFrame), SIMPLE_SVG_CREATE(feGaussianBlur, NS_NewSVGFELeafFrame), SIMPLE_SVG_CREATE(feImage, NS_NewSVGFEImageFrame), SIMPLE_SVG_CREATE(feMerge, NS_NewSVGFEContainerFrame), SIMPLE_SVG_CREATE(feMergeNode, NS_NewSVGFEUnstyledLeafFrame), SIMPLE_SVG_CREATE(feMorphology, NS_NewSVGFELeafFrame), SIMPLE_SVG_CREATE(feOffset, NS_NewSVGFELeafFrame), SIMPLE_SVG_CREATE(feSpecularLighting, NS_NewSVGFEContainerFrame), SIMPLE_SVG_CREATE(feTile, NS_NewSVGFELeafFrame), SIMPLE_SVG_CREATE(feTurbulence, NS_NewSVGFELeafFrame) }; const FrameConstructionData* data = FindDataByTag(aTag, aElement, aStyleContext, sSVGData, ArrayLength(sSVGData)); if (!data) { data = &sContainerData; } return data; } void nsCSSFrameConstructor::AddPageBreakItem(nsIContent* aContent, nsStyleContext* aMainStyleContext, FrameConstructionItemList& aItems) { nsRefPtr pseudoStyle; // Use the same parent style context that |aMainStyleContext| has, since // that's easier to re-resolve and it doesn't matter in practice. // (Getting different parents can result in framechange hints, e.g., // for user-modify.) pseudoStyle = mPresShell->StyleSet()-> ResolveAnonymousBoxStyle(nsCSSAnonBoxes::pageBreak, aMainStyleContext->GetParent()); NS_ASSERTION(pseudoStyle->GetStyleDisplay()->mDisplay == NS_STYLE_DISPLAY_BLOCK, "Unexpected display"); static const FrameConstructionData sPageBreakData = FCDATA_DECL(FCDATA_SKIP_FRAMESET, NS_NewPageBreakFrame); // Lie about the tag and namespace so we don't trigger anything // interesting during frame construction. aItems.AppendItem(&sPageBreakData, aContent, nsCSSAnonBoxes::pageBreak, kNameSpaceID_None, nullptr, pseudoStyle.forget(), true); } nsresult nsCSSFrameConstructor::ConstructFrame(nsFrameConstructorState& aState, nsIContent* aContent, nsIFrame* aParentFrame, nsFrameItems& aFrameItems) { NS_PRECONDITION(nullptr != aParentFrame, "no parent frame"); FrameConstructionItemList items; AddFrameConstructionItems(aState, aContent, true, aParentFrame, items); items.SetTriedConstructingFrames(); for (FCItemIterator iter(items); !iter.IsDone(); iter.Next()) { NS_ASSERTION(iter.item().DesiredParentType() == GetParentType(aParentFrame), "This is not going to work"); nsresult rv = ConstructFramesFromItem(aState, iter, aParentFrame, aFrameItems); NS_ENSURE_SUCCESS(rv, rv); } return NS_OK; } void nsCSSFrameConstructor::AddFrameConstructionItems(nsFrameConstructorState& aState, nsIContent* aContent, bool aSuppressWhiteSpaceOptimizations, nsIFrame* aParentFrame, FrameConstructionItemList& aItems) { aContent->UnsetFlags(NODE_DESCENDANTS_NEED_FRAMES | NODE_NEEDS_FRAME); if (aContent->IsElement()) { // We can't just remove our pending restyle flags, since we may // have restyle-later-siblings set on us. But we _can_ remove the // "is possible restyle root" flags, and need to. Otherwise we can // end up with stale such flags (e.g. if we used to have a // display:none parent when our last restyle was posted and // processed and now no longer do). aContent->UnsetFlags(ELEMENT_ALL_RESTYLE_FLAGS & ~ELEMENT_PENDING_RESTYLE_FLAGS); } // XXX the GetContent() != aContent check is needed due to bug 135040. // Remove it once that's fixed. if (aContent->GetPrimaryFrame() && aContent->GetPrimaryFrame()->GetContent() == aContent && !aState.mCreatingExtraFrames) { NS_ERROR("asked to create frame construction item for a node that already " "has a frame"); return; } // don't create a whitespace frame if aParent doesn't want it if (!NeedFrameFor(aState, aParentFrame, aContent)) { return; } // never create frames for comments or PIs if (aContent->IsNodeOfType(nsINode::eCOMMENT) || aContent->IsNodeOfType(nsINode::ePROCESSING_INSTRUCTION)) return; nsRefPtr styleContext; styleContext = ResolveStyleContext(aParentFrame, aContent, &aState); AddFrameConstructionItemsInternal(aState, aContent, aParentFrame, aContent->Tag(), aContent->GetNameSpaceID(), aSuppressWhiteSpaceOptimizations, styleContext, ITEM_ALLOW_XBL_BASE | ITEM_ALLOW_PAGE_BREAK, aItems); } /* static */ void nsCSSFrameConstructor::SetAsUndisplayedContent(FrameConstructionItemList& aList, nsIContent* aContent, nsStyleContext* aStyleContext, bool aIsGeneratedContent) { if (aStyleContext->GetPseudo()) { if (aIsGeneratedContent) { aContent->UnbindFromTree(); } return; } NS_ASSERTION(!aIsGeneratedContent, "Should have had pseudo type"); aList.AppendUndisplayedItem(aContent, aStyleContext); } void nsCSSFrameConstructor::AddFrameConstructionItemsInternal(nsFrameConstructorState& aState, nsIContent* aContent, nsIFrame* aParentFrame, nsIAtom* aTag, int32_t aNameSpaceID, bool aSuppressWhiteSpaceOptimizations, nsStyleContext* aStyleContext, uint32_t aFlags, FrameConstructionItemList& aItems) { NS_PRECONDITION(aContent->IsNodeOfType(nsINode::eTEXT) || aContent->IsElement(), "Shouldn't get anything else here!"); // The following code allows the user to specify the base tag // of an element using XBL. XUL and HTML objects (like boxes, menus, etc.) // can then be extended arbitrarily. const nsStyleDisplay* display = aStyleContext->GetStyleDisplay(); nsRefPtr styleContext(aStyleContext); PendingBinding* pendingBinding = nullptr; if ((aFlags & ITEM_ALLOW_XBL_BASE) && display->mBinding) { // Ensure that our XBL bindings are installed. nsXBLService* xblService = nsXBLService::GetInstance(); if (!xblService) return; bool resolveStyle; nsAutoPtr newPendingBinding(new PendingBinding()); nsresult rv = xblService->LoadBindings(aContent, display->mBinding->GetURI(), display->mBinding->mOriginPrincipal, false, getter_AddRefs(newPendingBinding->mBinding), &resolveStyle); if (NS_FAILED(rv) && rv != NS_ERROR_XBL_BLOCKED) return; if (newPendingBinding->mBinding) { pendingBinding = newPendingBinding; // aState takes over owning newPendingBinding aState.AddPendingBinding(newPendingBinding.forget()); } if (resolveStyle) { styleContext = ResolveStyleContext(styleContext->GetParent(), aContent, &aState); display = styleContext->GetStyleDisplay(); aStyleContext = styleContext; } aTag = mDocument->BindingManager()->ResolveTag(aContent, &aNameSpaceID); } bool isGeneratedContent = ((aFlags & ITEM_IS_GENERATED_CONTENT) != 0); // Pre-check for display "none" - if we find that, don't create // any frame at all if (NS_STYLE_DISPLAY_NONE == display->mDisplay) { SetAsUndisplayedContent(aItems, aContent, styleContext, isGeneratedContent); return; } bool isText = !aContent->IsElement(); // never create frames for non-option/optgroup kids of
so no need to check it items.SetLineBoundaryAtEnd(!parentAfterFrame || !parentAfterFrame->IsInlineOutside()); } // To suppress whitespace-only text frames, we have to verify that // our container's DOM child list matches its flattened tree child list. // This is guaranteed to be true if GetXBLChildNodesFor() returns null. items.SetParentHasNoXBLChildren(haveNoXBLChildren); nsFrameItems frameItems; ConstructFramesFromItemList(state, items, parentFrame, frameItems); for (nsIContent* child = aFirstNewContent; child; child = child->GetNextSibling()) { // Invalidate now instead of before the WipeContainingBlock call, just in // case we do wipe; in that case we don't need to do this walk at all. // XXXbz does that matter? Would it make more sense to save some virtual // GetChildAt calls instead and do this during construction of our // FrameConstructionItemList? InvalidateCanvasIfNeeded(mPresShell, child); } // if the container is a table and a caption was appended, it needs to be put // in the outer table frame's additional child list. nsFrameItems captionItems; if (nsGkAtoms::tableFrame == frameType) { // Pull out the captions. Note that we don't want to do that as we go, // because processing a single caption can add a whole bunch of things to // the frame items due to pseudoframe processing. So we'd have to pull // captions from a list anyway; might as well do that here. // XXXbz this is no longer true; we could pull captions directly out of the // FrameConstructionItemList now. PullOutCaptionFrames(frameItems, captionItems); } if (haveFirstLineStyle && parentFrame == containingBlock) { // It's possible that some of the new frames go into a // first-line frame. Look at them and see... AppendFirstLineFrames(state, containingBlock->GetContent(), containingBlock, frameItems); } // Notify the parent frame passing it the list of new frames // Append the flowed frames to the principal child list; captions // need special treatment if (captionItems.NotEmpty()) { // append the caption to the outer table NS_ASSERTION(nsGkAtoms::tableFrame == frameType, "how did that happen?"); nsIFrame* outerTable = parentFrame->GetParent(); AppendFrames(outerTable, nsIFrame::kCaptionList, captionItems); } if (frameItems.NotEmpty()) { // append the in-flow kids AppendFramesToParent(state, parentFrame, frameItems, prevSibling); } // Recover first-letter frames if (haveFirstLetterStyle) { RecoverLetterFrames(containingBlock); } #ifdef DEBUG if (gReallyNoisyContentUpdates) { printf("nsCSSFrameConstructor::ContentAppended: resulting frame model:\n"); parentFrame->List(stdout, 0); } #endif #ifdef ACCESSIBILITY nsAccessibilityService* accService = nsIPresShell::AccService(); if (accService) { accService->ContentRangeInserted(mPresShell, aContainer, aFirstNewContent, nullptr); } #endif return NS_OK; } #ifdef MOZ_XUL enum content_operation { CONTENT_INSERTED, CONTENT_REMOVED }; // Helper function to lookup the listbox body frame and send a notification // for insertion or removal of content static bool NotifyListBoxBody(nsPresContext* aPresContext, nsIContent* aContainer, nsIContent* aChild, // Only used for the removed notification nsIContent* aOldNextSibling, nsIDocument* aDocument, nsIFrame* aChildFrame, content_operation aOperation) { nsListBoxBodyFrame* listBoxBodyFrame = MaybeGetListBoxBodyFrame(aContainer, aChild); if (listBoxBodyFrame) { if (aOperation == CONTENT_REMOVED) { // Except if we have an aChildFrame and its parent is not the right // thing, then we don't do this. Pseudo frames are so much fun.... if (!aChildFrame || aChildFrame->GetParent() == listBoxBodyFrame) { listBoxBodyFrame->OnContentRemoved(aPresContext, aContainer, aChildFrame, aOldNextSibling); return true; } } else { listBoxBodyFrame->OnContentInserted(aPresContext, aChild); return true; } } return false; } #endif // MOZ_XUL nsresult nsCSSFrameConstructor::ContentInserted(nsIContent* aContainer, nsIContent* aChild, nsILayoutHistoryState* aFrameState, bool aAllowLazyConstruction) { return ContentRangeInserted(aContainer, aChild, aChild->GetNextSibling(), aFrameState, aAllowLazyConstruction); } // ContentRangeInserted handles creating frames for a range of nodes that // aren't at the end of their childlist. ContentRangeInserted isn't a real // content notification, but rather it handles regular ContentInserted calls // for a single node as well as the lazy construction of frames for a range of // nodes when called from CreateNeededFrames. For a range of nodes to be // suitable to have its frames constructed all at once they must meet the same // conditions that ContentAppended imposes (GetRangeInsertionPoint checks // these), plus more. Namely when finding the insertion prevsibling we must not // need to consult something specific to any one node in the range, so that the // insertion prevsibling would be the same for each node in the range. So we // pass the first node in the range to GetInsertionPrevSibling, and if // IsValidSibling (the only place GetInsertionPrevSibling might look at the // passed in node itself) needs to resolve style on the node we record this and // return that this range needs to be split up and inserted separately. Table // captions need extra attention as we need to determine where to insert them // in the caption list, while skipping any nodes in the range being inserted // (because when we treat the caption frames the other nodes have had their // frames constructed but not yet inserted into the frame tree). nsresult nsCSSFrameConstructor::ContentRangeInserted(nsIContent* aContainer, nsIContent* aStartChild, nsIContent* aEndChild, nsILayoutHistoryState* aFrameState, bool aAllowLazyConstruction) { AUTO_LAYOUT_PHASE_ENTRY_POINT(mPresShell->GetPresContext(), FrameC); NS_PRECONDITION(mUpdateCount != 0, "Should be in an update while creating frames"); NS_PRECONDITION(aStartChild, "must always pass a child"); // XXXldb Do we need to re-resolve style to handle the CSS2 + combinator and // the :empty pseudo-class? #ifdef DEBUG if (gNoisyContentUpdates) { printf("nsCSSFrameConstructor::ContentRangeInserted container=%p " "start-child=%p end-child=%p lazy=%d\n", static_cast(aContainer), static_cast(aStartChild), static_cast(aEndChild), aAllowLazyConstruction); if (gReallyNoisyContentUpdates) { if (aContainer) { aContainer->List(stdout,0); } else { aStartChild->List(stdout, 0); } } } #endif #ifdef DEBUG for (nsIContent* child = aStartChild; child != aEndChild; child = child->GetNextSibling()) { // XXX the GetContent() != child check is needed due to bug 135040. // Remove it once that's fixed. NS_ASSERTION(!child->GetPrimaryFrame() || child->GetPrimaryFrame()->GetContent() != child, "asked to construct a frame for a node that already has a frame"); } #endif nsresult rv = NS_OK; bool isSingleInsert = (aStartChild->GetNextSibling() == aEndChild); NS_ASSERTION(isSingleInsert || !aAllowLazyConstruction, "range insert shouldn't be lazy"); NS_ASSERTION(isSingleInsert || aEndChild, "range should not include all nodes after aStartChild"); #ifdef MOZ_XUL if (aContainer && IsXULListBox(aContainer)) { if (isSingleInsert) { if (NotifyListBoxBody(mPresShell->GetPresContext(), aContainer, // The insert case in NotifyListBoxBody // doesn't use "old next sibling". aStartChild, nullptr, mDocument, nullptr, CONTENT_INSERTED)) { return NS_OK; } } else { // We don't handle a range insert to a listbox parent, issue single // ContertInserted calls for each node inserted. LAYOUT_PHASE_TEMP_EXIT(); IssueSingleInsertNofications(aContainer, aStartChild, aEndChild, aAllowLazyConstruction); LAYOUT_PHASE_TEMP_REENTER(); return NS_OK; } } #endif // MOZ_XUL // If we have a null parent, then this must be the document element being // inserted, or some other child of the document in the DOM (might be a PI, // say). if (! aContainer) { NS_ASSERTION(isSingleInsert, "root node insertion should be a single insertion"); Element *docElement = mDocument->GetRootElement(); if (aStartChild != docElement) { // Not the root element; just bail out return NS_OK; } NS_PRECONDITION(nullptr == mRootElementFrame, "root element frame already created"); // Create frames for the document element and its child elements nsIFrame* docElementFrame; rv = ConstructDocElementFrame(docElement, aFrameState, &docElementFrame); if (NS_SUCCEEDED(rv) && docElementFrame) { InvalidateCanvasIfNeeded(mPresShell, aStartChild); #ifdef DEBUG if (gReallyNoisyContentUpdates) { printf("nsCSSFrameConstructor::ContentRangeInserted: resulting frame " "model:\n"); mFixedContainingBlock->List(stdout, 0); } #endif } #ifdef ACCESSIBILITY nsAccessibilityService* accService = nsIPresShell::AccService(); if (accService) { accService->ContentRangeInserted(mPresShell, aContainer, aStartChild, aEndChild); } #endif return NS_OK; } // Otherwise, we've got parent content. Find its frame. nsIFrame* parentFrame = GetFrameFor(aContainer); if (! parentFrame) return NS_OK; if (aAllowLazyConstruction && MaybeConstructLazily(CONTENTINSERT, aContainer, aStartChild)) { return NS_OK; } if (isSingleInsert) { // See if we have an XBL insertion point. If so, then that's our // real parent frame; if not, then the frame hasn't been built yet // and we just bail. nsIFrame* insertionPoint; GetInsertionPoint(parentFrame, aStartChild, &insertionPoint); if (! insertionPoint) return NS_OK; // Don't build the frames. parentFrame = insertionPoint; } else { // Get our insertion point. If we need to issue single ContentInserted's // GetRangeInsertionPoint will take care of that for us. LAYOUT_PHASE_TEMP_EXIT(); parentFrame = GetRangeInsertionPoint(aContainer, parentFrame, aStartChild, aEndChild, aAllowLazyConstruction); LAYOUT_PHASE_TEMP_REENTER(); if (!parentFrame) { return NS_OK; } } bool isAppend, isRangeInsertSafe; nsIFrame* prevSibling = GetInsertionPrevSibling(parentFrame, aContainer, aStartChild, &isAppend, &isRangeInsertSafe); // check if range insert is safe if (!isSingleInsert && !isRangeInsertSafe) { // must fall back to a single ContertInserted for each child in the range LAYOUT_PHASE_TEMP_EXIT(); IssueSingleInsertNofications(aContainer, aStartChild, aEndChild, aAllowLazyConstruction); LAYOUT_PHASE_TEMP_REENTER(); return NS_OK; } nsIContent* container = parentFrame->GetContent(); nsIAtom* frameType = parentFrame->GetType(); LAYOUT_PHASE_TEMP_EXIT(); if (MaybeRecreateForFrameset(parentFrame, aStartChild, aEndChild)) { LAYOUT_PHASE_TEMP_REENTER(); return NS_OK; } LAYOUT_PHASE_TEMP_REENTER(); // We should only get here with fieldsets when doing a single insert, because // fieldsets have multiple insertion points. NS_ASSERTION(isSingleInsert || frameType != nsGkAtoms::fieldSetFrame, "Unexpected parent"); if (frameType == nsGkAtoms::fieldSetFrame && aStartChild->Tag() == nsGkAtoms::legend) { // Just reframe the parent, since figuring out whether this // should be the new legend and then handling it is too complex. // We could do a little better here --- check if the fieldset already // has a legend which occurs earlier in its child list than this node, // and if so, proceed. But we'd have to extend nsFieldSetFrame // to locate this legend in the inserted frames and extract it. LAYOUT_PHASE_TEMP_EXIT(); nsresult rv = RecreateFramesForContent(parentFrame->GetContent(), false); LAYOUT_PHASE_TEMP_REENTER(); return rv; } // Don't construct kids of leaves if (parentFrame->IsLeaf()) { // Clear lazy bits so we don't try to construct again. ClearLazyBits(aStartChild, aEndChild); return NS_OK; } if (parentFrame->IsFrameOfType(nsIFrame::eMathML)) { LAYOUT_PHASE_TEMP_EXIT(); nsresult rv = RecreateFramesForContent(parentFrame->GetContent(), false); LAYOUT_PHASE_TEMP_REENTER(); return rv; } nsFrameConstructorState state(mPresShell, mFixedContainingBlock, GetAbsoluteContainingBlock(parentFrame), GetFloatContainingBlock(parentFrame), aFrameState); state.mTreeMatchContext.mAncestorFilter.Init(aContainer ? aContainer->AsElement() : nullptr); // Recover state for the containing block - we need to know if // it has :first-letter or :first-line style applied to it. The // reason we care is that the internal structure in these cases // is not the normal structure and requires custom updating // logic. nsIFrame* containingBlock = state.mFloatedItems.containingBlock; bool haveFirstLetterStyle = false; bool haveFirstLineStyle = false; // In order to shave off some cycles, we only dig up the // containing block haveFirst* flags if the parent frame where // the insertion/append is occurring is an inline or block // container. For other types of containers this isn't relevant. uint8_t parentDisplay = parentFrame->GetDisplay(); // Examine the parentFrame where the insertion is taking // place. If it's a certain kind of container then some special // processing is done. if ((NS_STYLE_DISPLAY_BLOCK == parentDisplay) || (NS_STYLE_DISPLAY_LIST_ITEM == parentDisplay) || (NS_STYLE_DISPLAY_INLINE == parentDisplay) || (NS_STYLE_DISPLAY_INLINE_BLOCK == parentDisplay)) { // Recover the special style flags for the containing block if (containingBlock) { haveFirstLetterStyle = HasFirstLetterStyle(containingBlock); haveFirstLineStyle = ShouldHaveFirstLineStyle(containingBlock->GetContent(), containingBlock->GetStyleContext()); } if (haveFirstLetterStyle) { // If our current parentFrame is a Letter frame, use its parent as our // new parent hint if (parentFrame->GetType() == nsGkAtoms::letterFrame) { // If parentFrame is out of flow, then we actually want the parent of // the placeholder frame. if (parentFrame->GetStateBits() & NS_FRAME_OUT_OF_FLOW) { nsPlaceholderFrame* placeholderFrame = GetPlaceholderFrameFor(parentFrame); NS_ASSERTION(placeholderFrame, "No placeholder for out-of-flow?"); parentFrame = placeholderFrame->GetParent(); } else { parentFrame = parentFrame->GetParent(); } } // Remove the old letter frames before doing the insertion RemoveLetterFrames(state.mPresContext, mPresShell, state.mFloatedItems.containingBlock); // Removing the letterframes messes around with the frame tree, removing // and creating frames. We need to reget our prevsibling, parent frame, // etc. prevSibling = GetInsertionPrevSibling(parentFrame, aContainer, aStartChild, &isAppend, &isRangeInsertSafe); // Need check whether a range insert is still safe. if (!isSingleInsert && !isRangeInsertSafe) { // Need to recover the letter frames first. RecoverLetterFrames(state.mFloatedItems.containingBlock); // must fall back to a single ContertInserted for each child in the range LAYOUT_PHASE_TEMP_EXIT(); IssueSingleInsertNofications(aContainer, aStartChild, aEndChild, aAllowLazyConstruction); LAYOUT_PHASE_TEMP_REENTER(); return NS_OK; } container = parentFrame->GetContent(); frameType = parentFrame->GetType(); } } if (!prevSibling) { // We're inserting the new frames as the first child. See if the // parent has a :before pseudo-element nsIFrame* firstChild = parentFrame->GetFirstPrincipalChild(); if (firstChild && nsLayoutUtils::IsGeneratedContentFor(container, firstChild, nsCSSPseudoElements::before)) { // Insert the new frames after the last continuation of the :before prevSibling = firstChild->GetTailContinuation(); parentFrame = prevSibling->GetParent()->GetContentInsertionFrame(); // Don't change isAppend here; we'll can call AppendFrames as needed, and // the change to our prevSibling doesn't affect that. } } FrameConstructionItemList items; ParentType parentType = GetParentType(frameType); bool haveNoXBLChildren = mDocument->BindingManager()->GetXBLChildNodesFor(aContainer) == nullptr; if (aStartChild->GetPreviousSibling() && parentType == eTypeBlock && haveNoXBLChildren) { // If there's a text node in the normal content list just before the // new nodes, and it has no frame, make a frame construction item for // it, because it might need a frame now. No need to do this if our // parent type is not block, though, since WipeContainingBlock // already handles that sitation. AddTextItemIfNeeded(state, parentFrame, aStartChild->GetPreviousSibling(), items); } if (isSingleInsert) { AddFrameConstructionItems(state, aStartChild, aStartChild->IsRootOfAnonymousSubtree(), parentFrame, items); } else { for (nsIContent* child = aStartChild; child != aEndChild; child = child->GetNextSibling()){ AddFrameConstructionItems(state, child, false, parentFrame, items); } } if (aEndChild && parentType == eTypeBlock && haveNoXBLChildren) { // If there's a text node in the normal content list just after the // new nodes, and it has no frame, make a frame construction item for // it, because it might need a frame now. No need to do this if our // parent type is not block, though, since WipeContainingBlock // already handles that sitation. AddTextItemIfNeeded(state, parentFrame, aEndChild, items); } // Perform special check for diddling around with the frames in // a special inline frame. // If we're appending before :after content, then we're not really // appending, so let WipeContainingBlock know that. LAYOUT_PHASE_TEMP_EXIT(); if (WipeContainingBlock(state, containingBlock, parentFrame, items, isAppend, prevSibling)) { LAYOUT_PHASE_TEMP_REENTER(); return NS_OK; } LAYOUT_PHASE_TEMP_REENTER(); // If the container is a table and a caption will be appended, it needs to be // put in the outer table frame's additional child list. // We make no attempt here to set flags to indicate whether the list // will be at the start or end of a block. It doesn't seem worthwhile. nsFrameItems frameItems, captionItems; ConstructFramesFromItemList(state, items, parentFrame, frameItems); if (frameItems.NotEmpty()) { for (nsIContent* child = aStartChild; child != aEndChild; child = child->GetNextSibling()){ InvalidateCanvasIfNeeded(mPresShell, child); } if (nsGkAtoms::tableFrame == frameType || nsGkAtoms::tableOuterFrame == frameType) { PullOutCaptionFrames(frameItems, captionItems); } } // If the parent of our current prevSibling is different from the frame we'll // actually use as the parent, then the calculated insertion point is now // invalid and as it is unknown where to insert correctly we append instead // (bug 341858). // This can affect our prevSibling and isAppend, but should not have any // effect on the WipeContainingBlock above, since this should only happen // when neither parent is a special frame and should not affect whitespace // handling inside table-related frames (and in fact, can only happen when // one of the parents is an outer table and one is an inner table or when the // parent is a fieldset or fieldset content frame). So it won't affect the // {ib} or XUL box cases in WipeContainingBlock(), and the table pseudo // handling will only be affected by us maybe thinking we're not inserting // at the beginning, whereas we really are. That would have made us reframe // unnecessarily, but that's ok. // XXXbz we should push our frame construction item code up higher, so we // know what our items are by the time we start figuring out previous // siblings if (prevSibling && frameItems.NotEmpty() && frameItems.FirstChild()->GetParent() != prevSibling->GetParent()) { #ifdef DEBUG nsIFrame* frame1 = frameItems.FirstChild()->GetParent(); nsIFrame* frame2 = prevSibling->GetParent(); NS_ASSERTION(!IsFrameSpecial(frame1) && !IsFrameSpecial(frame2), "Neither should be special"); NS_ASSERTION((frame1->GetType() == nsGkAtoms::tableFrame && frame2->GetType() == nsGkAtoms::tableOuterFrame) || (frame1->GetType() == nsGkAtoms::tableOuterFrame && frame2->GetType() == nsGkAtoms::tableFrame) || frame1->GetType() == nsGkAtoms::fieldSetFrame || (frame1->GetParent() && frame1->GetParent()->GetType() == nsGkAtoms::fieldSetFrame), "Unexpected frame types"); #endif isAppend = true; nsIFrame* appendAfterFrame; parentFrame = ::AdjustAppendParentForAfterContent(mPresShell->GetPresContext(), container, frameItems.FirstChild()->GetParent(), &appendAfterFrame); prevSibling = ::FindAppendPrevSibling(parentFrame, appendAfterFrame); } if (haveFirstLineStyle && parentFrame == containingBlock) { // It's possible that the new frame goes into a first-line // frame. Look at it and see... if (isAppend) { // Use append logic when appending AppendFirstLineFrames(state, containingBlock->GetContent(), containingBlock, frameItems); } else { // Use more complicated insert logic when inserting // XXXbz this method is a no-op, so it's easy for the args being passed // here to make no sense without anyone noticing... If it ever stops // being a no-op, vet them carefully! InsertFirstLineFrames(state, container, containingBlock, &parentFrame, prevSibling, frameItems); } } // We might have captions; put them into the caption list of the // outer table frame. if (captionItems.NotEmpty()) { NS_ASSERTION(nsGkAtoms::tableFrame == frameType || nsGkAtoms::tableOuterFrame == frameType, "parent for caption is not table?"); // We need to determine where to put the caption items; start with the // the parent frame that has already been determined and get the insertion // prevsibling of the first caption item. nsIFrame* captionParent = parentFrame; bool captionIsAppend; nsIFrame* captionPrevSibling = nullptr; // aIsRangeInsertSafe is ignored on purpose because it is irrelevant here. bool ignored; if (isSingleInsert) { captionPrevSibling = GetInsertionPrevSibling(captionParent, aContainer, aStartChild, &captionIsAppend, &ignored); } else { nsIContent* firstCaption = captionItems.FirstChild()->GetContent(); // It is very important here that we skip the children in // [aStartChild,aEndChild) when looking for a // prevsibling. captionPrevSibling = GetInsertionPrevSibling(captionParent, aContainer, firstCaption, &captionIsAppend, &ignored, aStartChild, aEndChild); } nsIFrame* outerTable = nullptr; if (GetCaptionAdjustedParent(captionParent, captionItems.FirstChild(), &outerTable)) { // If the parent is not an outer table frame we will try to add frames // to a named child list that the parent does not honour and the frames // will get lost NS_ASSERTION(nsGkAtoms::tableOuterFrame == outerTable->GetType(), "Pseudo frame construction failure; " "a caption can be only a child of an outer table frame"); // If the parent of our current prevSibling is different from the frame // we'll actually use as the parent, then the calculated insertion // point is now invalid (bug 341382). if (captionPrevSibling && captionPrevSibling->GetParent() != outerTable) { captionPrevSibling = nullptr; } if (captionIsAppend) { AppendFrames(outerTable, nsIFrame::kCaptionList, captionItems); } else { InsertFrames(outerTable, nsIFrame::kCaptionList, captionPrevSibling, captionItems); } } } if (frameItems.NotEmpty()) { // Notify the parent frame if (isAppend) { AppendFramesToParent(state, parentFrame, frameItems, prevSibling); } else { InsertFrames(parentFrame, kPrincipalList, prevSibling, frameItems); } } if (haveFirstLetterStyle) { // Recover the letter frames for the containing block when // it has first-letter style. RecoverLetterFrames(state.mFloatedItems.containingBlock); } #ifdef DEBUG if (gReallyNoisyContentUpdates && parentFrame) { printf("nsCSSFrameConstructor::ContentRangeInserted: resulting frame model:\n"); parentFrame->List(stdout, 0); } #endif #ifdef ACCESSIBILITY nsAccessibilityService* accService = nsIPresShell::AccService(); if (accService) { accService->ContentRangeInserted(mPresShell, aContainer, aStartChild, aEndChild); } #endif return NS_OK; } nsresult nsCSSFrameConstructor::ContentRemoved(nsIContent* aContainer, nsIContent* aChild, nsIContent* aOldNextSibling, RemoveFlags aFlags, bool* aDidReconstruct) { AUTO_LAYOUT_PHASE_ENTRY_POINT(mPresShell->GetPresContext(), FrameC); NS_PRECONDITION(mUpdateCount != 0, "Should be in an update while destroying frames"); *aDidReconstruct = false; // XXXldb Do we need to re-resolve style to handle the CSS2 + combinator and // the :empty pseudo-class? #ifdef DEBUG if (gNoisyContentUpdates) { printf("nsCSSFrameConstructor::ContentRemoved container=%p child=%p " "old-next-sibling=%p\n", static_cast(aContainer), static_cast(aChild), static_cast(aOldNextSibling)); if (gReallyNoisyContentUpdates) { aContainer->List(stdout, 0); } } #endif nsPresContext *presContext = mPresShell->GetPresContext(); nsresult rv = NS_OK; // Find the child frame that maps the content nsIFrame* childFrame = aChild->GetPrimaryFrame(); if (!childFrame || childFrame->GetContent() != aChild) { // XXXbz the GetContent() != aChild check is needed due to bug 135040. // Remove it once that's fixed. ClearUndisplayedContentIn(aChild, aContainer); } #ifdef MOZ_XUL if (NotifyListBoxBody(presContext, aContainer, aChild, aOldNextSibling, mDocument, childFrame, CONTENT_REMOVED)) return NS_OK; #endif // MOZ_XUL // If we're removing the root, then make sure to remove things starting at // the viewport's child instead of the primary frame (which might even be // null if the root had an XBL binding or display:none, even though the // frames above it got created). We do the adjustment after the childFrame // check above, because we do want to clear any undisplayed content we might // have for the root. Detecting removal of a root is a little exciting; in // particular, having a null aContainer is necessary but NOT sufficient. Due // to how we process reframes, the content node might not even be in our // document by now. So explicitly check whether the viewport's first kid's // content node is aChild. bool isRoot = false; if (!aContainer) { nsIFrame* viewport = GetRootFrame(); if (viewport) { nsIFrame* firstChild = viewport->GetFirstPrincipalChild(); if (firstChild && firstChild->GetContent() == aChild) { isRoot = true; childFrame = firstChild; NS_ASSERTION(!childFrame->GetNextSibling(), "How did that happen?"); } } } if (childFrame) { InvalidateCanvasIfNeeded(mPresShell, aChild); // See whether we need to remove more than just childFrame LAYOUT_PHASE_TEMP_EXIT(); if (MaybeRecreateContainerForFrameRemoval(childFrame, &rv)) { LAYOUT_PHASE_TEMP_REENTER(); *aDidReconstruct = true; return rv; } LAYOUT_PHASE_TEMP_REENTER(); // Get the childFrame's parent frame nsIFrame* parentFrame = childFrame->GetParent(); nsIAtom* parentType = parentFrame->GetType(); if (parentType == nsGkAtoms::frameSetFrame && IsSpecialFramesetChild(aChild)) { // Just reframe the parent, since framesets are weird like that. *aDidReconstruct = true; LAYOUT_PHASE_TEMP_EXIT(); nsresult rv = RecreateFramesForContent(parentFrame->GetContent(), false); LAYOUT_PHASE_TEMP_REENTER(); return rv; } // If we're a child of MathML, then we should reframe the MathML content. // If we're non-MathML, then we would be wrapped in a block so we need to // check our grandparent in that case. nsIFrame* possibleMathMLAncestor = parentType == nsGkAtoms::blockFrame ? parentFrame->GetParent() : parentFrame; if (possibleMathMLAncestor->IsFrameOfType(nsIFrame::eMathML)) { *aDidReconstruct = true; LAYOUT_PHASE_TEMP_EXIT(); nsresult rv = RecreateFramesForContent(possibleMathMLAncestor->GetContent(), false); LAYOUT_PHASE_TEMP_REENTER(); return rv; } // Undo XUL wrapping if it's no longer needed. // (If we're in the XUL block-wrapping situation, parentFrame is the // wrapper frame.) nsIFrame* grandparentFrame = parentFrame->GetParent(); if (grandparentFrame && grandparentFrame->IsBoxFrame() && (grandparentFrame->GetStateBits() & NS_STATE_BOX_WRAPS_KIDS_IN_BLOCK) && // check if this frame is the only one needing wrapping aChild == AnyKidsNeedBlockParent(parentFrame->GetFirstPrincipalChild()) && !AnyKidsNeedBlockParent(childFrame->GetNextSibling())) { *aDidReconstruct = true; LAYOUT_PHASE_TEMP_EXIT(); nsresult rv = RecreateFramesForContent(grandparentFrame->GetContent(), true); LAYOUT_PHASE_TEMP_REENTER(); return rv; } #ifdef ACCESSIBILITY nsAccessibilityService* accService = nsIPresShell::AccService(); if (accService) { accService->ContentRemoved(mPresShell, aContainer, aChild); } #endif // Examine the containing-block for the removed content and see if // :first-letter style applies. nsIFrame* inflowChild = childFrame; if (childFrame->GetStateBits() & NS_FRAME_OUT_OF_FLOW) { inflowChild = GetPlaceholderFrameFor(childFrame); NS_ASSERTION(inflowChild, "No placeholder for out-of-flow?"); } nsIFrame* containingBlock = GetFloatContainingBlock(inflowChild->GetParent()); bool haveFLS = containingBlock && HasFirstLetterStyle(containingBlock); if (haveFLS) { // Trap out to special routine that handles adjusting a blocks // frame tree when first-letter style is present. #ifdef NOISY_FIRST_LETTER printf("ContentRemoved: containingBlock="); nsFrame::ListTag(stdout, containingBlock); printf(" parentFrame="); nsFrame::ListTag(stdout, parentFrame); printf(" childFrame="); nsFrame::ListTag(stdout, childFrame); printf("\n"); #endif // First update the containing blocks structure by removing the // existing letter frames. This makes the subsequent logic // simpler. RemoveLetterFrames(presContext, mPresShell, containingBlock); // Recover childFrame and parentFrame childFrame = aChild->GetPrimaryFrame(); if (!childFrame || childFrame->GetContent() != aChild) { // XXXbz the GetContent() != aChild check is needed due to bug 135040. // Remove it once that's fixed. ClearUndisplayedContentIn(aChild, aContainer); return NS_OK; } parentFrame = childFrame->GetParent(); parentType = parentFrame->GetType(); #ifdef NOISY_FIRST_LETTER printf(" ==> revised parentFrame="); nsFrame::ListTag(stdout, parentFrame); printf(" childFrame="); nsFrame::ListTag(stdout, childFrame); printf("\n"); #endif } #ifdef DEBUG if (gReallyNoisyContentUpdates) { printf("nsCSSFrameConstructor::ContentRemoved: childFrame="); nsFrame::ListTag(stdout, childFrame); putchar('\n'); parentFrame->List(stdout, 0); } #endif // Notify the parent frame that it should delete the frame if (childFrame->GetStateBits() & NS_FRAME_OUT_OF_FLOW) { childFrame = GetPlaceholderFrameFor(childFrame); NS_ASSERTION(childFrame, "Missing placeholder frame for out of flow."); parentFrame = childFrame->GetParent(); } rv = RemoveFrame(nsLayoutUtils::GetChildListNameFor(childFrame), childFrame); //XXXfr NS_ENSURE_SUCCESS(rv, rv) ? if (isRoot) { mRootElementFrame = nullptr; mRootElementStyleFrame = nullptr; mDocElementContainingBlock = nullptr; mPageSequenceFrame = nullptr; mGfxScrollFrame = nullptr; mHasRootAbsPosContainingBlock = false; mFixedContainingBlock = GetRootFrame(); } if (haveFLS && mRootElementFrame) { RecoverLetterFrames(containingBlock); } // If we're just reconstructing frames for the element, then the // following ContentInserted notification on the element will // take care of fixing up any adjacent text nodes. We don't need // to do this if the table parent type of our parent type is not // eTypeBlock, though, because in that case the whitespace isn't // being suppressed due to us anyway. if (aContainer && !aChild->IsRootOfAnonymousSubtree() && aFlags != REMOVE_FOR_RECONSTRUCTION && GetParentType(parentType) == eTypeBlock) { // Adjacent whitespace-only text nodes might have been suppressed if // this node does not have inline ends. Create frames for them now // if necessary. // Reframe any text node just before the node being removed, if there is // one, and if it's not the last child or the first child. If a whitespace // textframe was being suppressed and it's now the last child or first // child then it can stay suppressed since the parent must be a block // and hence it's adjacent to a block end. // If aOldNextSibling is null, then the text node before the node being // removed is the last node, and we don't need to worry about it. if (aOldNextSibling) { nsIContent* prevSibling = aOldNextSibling->GetPreviousSibling(); if (prevSibling && prevSibling->GetPreviousSibling()) { LAYOUT_PHASE_TEMP_EXIT(); ReframeTextIfNeeded(aContainer, prevSibling); LAYOUT_PHASE_TEMP_REENTER(); } } // Reframe any text node just after the node being removed, if there is // one, and if it's not the last child or the first child. if (aOldNextSibling && aOldNextSibling->GetNextSibling() && aOldNextSibling->GetPreviousSibling()) { LAYOUT_PHASE_TEMP_EXIT(); ReframeTextIfNeeded(aContainer, aOldNextSibling); LAYOUT_PHASE_TEMP_REENTER(); } } #ifdef DEBUG if (gReallyNoisyContentUpdates && parentFrame) { printf("nsCSSFrameConstructor::ContentRemoved: resulting frame model:\n"); parentFrame->List(stdout, 0); } #endif } return rv; } #ifdef DEBUG // To ensure that the functions below are only called within // |ApplyRenderingChangeToTree|. static bool gInApplyRenderingChangeToTree = false; #endif static void DoApplyRenderingChangeToTree(nsIFrame* aFrame, nsFrameManager* aFrameManager, nsChangeHint aChange); /** * This rect is relative to aFrame's parent */ static void UpdateViewsForTree(nsIFrame* aFrame, nsFrameManager* aFrameManager, nsChangeHint aChange) { NS_PRECONDITION(gInApplyRenderingChangeToTree, "should only be called within ApplyRenderingChangeToTree"); nsIView* view = aFrame->GetView(); if (view) { if (aChange & nsChangeHint_SyncFrameView) { nsContainerFrame::SyncFrameViewProperties(aFrame->PresContext(), aFrame, nullptr, view); } } nsIFrame::ChildListIterator lists(aFrame); for (; !lists.IsDone(); lists.Next()) { nsFrameList::Enumerator childFrames(lists.CurrentList()); for (; !childFrames.AtEnd(); childFrames.Next()) { nsIFrame* child = childFrames.get(); if (!(child->GetStateBits() & NS_FRAME_OUT_OF_FLOW)) { // only do frames that don't have placeholders if (nsGkAtoms::placeholderFrame == child->GetType()) { // do the out-of-flow frame and its continuations nsIFrame* outOfFlowFrame = nsPlaceholderFrame::GetRealFrameForPlaceholder(child); do { DoApplyRenderingChangeToTree(outOfFlowFrame, aFrameManager, aChange); } while ((outOfFlowFrame = outOfFlowFrame->GetNextContinuation())); } else if (lists.CurrentID() == nsIFrame::kPopupList) { DoApplyRenderingChangeToTree(child, aFrameManager, aChange); } else { // regular frame UpdateViewsForTree(child, aFrameManager, aChange); } } } } } /** * To handle nsChangeHint_ChildrenOnlyTransform we must iterate over the child * frames of the SVG frame concerned. This helper function is used to find that * SVG frame when we encounter nsChangeHint_ChildrenOnlyTransform to ensure * that we iterate over the intended children, since sometimes we end up * handling that hint while processing hints for one of the SVG frame's * ancestor frames. * * The reason that we sometimes end up trying to process the hint for an * ancestor of the SVG frame that the hint is intended for is due to the way we * process restyle events. ApplyRenderingChangeToTree adjusts the frame from * the restyled element's principle frame to one of its ancestor frames based * on what nsCSSRendering::FindBackground returns, since the background style * may have been propagated up to an ancestor frame. Processing hints using an * ancestor frame is fine in general, but nsChangeHint_ChildrenOnlyTransform is * a special case since it is intended to update the children of a specific * frame. */ static nsIFrame* GetFrameForChildrenOnlyTransformHint(nsIFrame *aFrame) { if (aFrame->GetType() == nsGkAtoms::viewportFrame) { // This happens if the root- is fixed positioned, in which case we // can't use aFrame->GetContent() to find the primary frame, since // GetContent() returns nullptr for ViewportFrame. aFrame = aFrame->GetFirstPrincipalChild(); } // For an nsHTMLScrollFrame, this will get the SVG frame that has the // children-only transforms: aFrame = aFrame->GetContent()->GetPrimaryFrame(); NS_ABORT_IF_FALSE(aFrame->IsFrameOfType(nsIFrame::eSVG | nsIFrame::eSVGContainer), "Children-only transforms only expected on SVG frames"); return aFrame; } static void DoApplyRenderingChangeToTree(nsIFrame* aFrame, nsFrameManager* aFrameManager, nsChangeHint aChange) { NS_PRECONDITION(gInApplyRenderingChangeToTree, "should only be called within ApplyRenderingChangeToTree"); for ( ; aFrame; aFrame = nsLayoutUtils::GetNextContinuationOrSpecialSibling(aFrame)) { // Get view if this frame has one and trigger an update. If the // frame doesn't have a view, find the nearest containing view // (adjusting r's coordinate system to reflect the nesting) and // update there. // We don't need to update transforms in UpdateViewsForTree, because // there can't be any out-of-flows or popups that need to be transformed; // all out-of-flow descendants of the transformed element must also be // descendants of the transformed frame. UpdateViewsForTree(aFrame, aFrameManager, nsChangeHint(aChange & (nsChangeHint_RepaintFrame | nsChangeHint_SyncFrameView | nsChangeHint_UpdateOpacityLayer))); // This must be set to true if the rendering change needs to // invalidate content. If it's false, a composite-only paint // (empty transaction) will be scheduled. bool needInvalidatingPaint = false; // if frame has view, will already be invalidated if (aChange & nsChangeHint_RepaintFrame) { if (aFrame->IsFrameOfType(nsIFrame::eSVG) && !(aFrame->GetStateBits() & NS_STATE_IS_OUTER_SVG)) { if (aChange & nsChangeHint_UpdateEffects) { needInvalidatingPaint = true; // Invalidate and update our area: nsSVGUtils::InvalidateAndScheduleReflowSVG(aFrame); } else { needInvalidatingPaint = true; // Just invalidate our area: nsSVGUtils::InvalidateBounds(aFrame); } } else { needInvalidatingPaint = true; aFrame->InvalidateFrameSubtree(); } } if (aChange & nsChangeHint_UpdateOpacityLayer) { // FIXME/bug 796697: we can get away with empty transactions for // opacity updates in many cases. needInvalidatingPaint = true; aFrame->MarkLayersActive(nsChangeHint_UpdateOpacityLayer); } if (aChange & nsChangeHint_UpdateTransformLayer) { aFrame->MarkLayersActive(nsChangeHint_UpdateTransformLayer); // If we're not already going to do an invalidating paint, see // if we can get away with only updating the transform on a // layer for this frame, and not scheduling an invalidating // paint. if (!needInvalidatingPaint) { needInvalidatingPaint |= !aFrame->TryUpdateTransformOnly(); } } if (aChange & nsChangeHint_ChildrenOnlyTransform) { needInvalidatingPaint = true; nsIFrame* childFrame = GetFrameForChildrenOnlyTransformHint(aFrame)->GetFirstPrincipalChild(); for ( ; childFrame; childFrame = childFrame->GetNextSibling()) { childFrame->MarkLayersActive(nsChangeHint_UpdateTransformLayer); } } aFrame->SchedulePaint(needInvalidatingPaint ? nsIFrame::PAINT_DEFAULT : nsIFrame::PAINT_COMPOSITE_ONLY); } } static void ApplyRenderingChangeToTree(nsPresContext* aPresContext, nsIFrame* aFrame, nsChangeHint aChange) { // We check GetStyleDisplay()->HasTransform() in addition to checking // IsTransformed() since we can get here for some frames that don't have the // NS_FRAME_MAY_BE_TRANSFORMED bit set (e.g. nsTableFrame; for a transformed // table that bit is only set on the nsTableOuterFrame). NS_ASSERTION(!(aChange & nsChangeHint_UpdateTransformLayer) || aFrame->IsTransformed() || aFrame->GetStyleDisplay()->HasTransform(), "Unexpected UpdateTransformLayer hint"); nsIPresShell *shell = aPresContext->PresShell(); if (shell->IsPaintingSuppressed()) { // Don't allow synchronous rendering changes when painting is turned off. aChange = NS_SubtractHint(aChange, nsChangeHint_RepaintFrame); if (!aChange) { return; } } // If the frame's background is propagated to an ancestor, walk up to // that ancestor. nsStyleContext *bgSC; while (!nsCSSRendering::FindBackground(aPresContext, aFrame, &bgSC)) { aFrame = aFrame->GetParent(); NS_ASSERTION(aFrame, "root frame must paint"); } // Trigger rendering updates by damaging this frame and any // continuations of this frame. // XXX this needs to detect the need for a view due to an opacity change and deal with it... #ifdef DEBUG gInApplyRenderingChangeToTree = true; #endif DoApplyRenderingChangeToTree(aFrame, shell->FrameManager(), aChange); #ifdef DEBUG gInApplyRenderingChangeToTree = false; #endif } /** * This method invalidates the canvas when frames are removed or added for a * node that might have its background propagated to the canvas, i.e., a * document root node or an HTML BODY which is a child of the root node. * * @param aFrame a frame for a content node about to be removed or a frame that * was just created for a content node that was inserted. */ static void InvalidateCanvasIfNeeded(nsIPresShell* presShell, nsIContent* node) { NS_PRECONDITION(presShell->GetRootFrame(), "What happened here?"); NS_PRECONDITION(presShell->GetPresContext(), "Say what?"); // Note that both in ContentRemoved and ContentInserted the content node // will still have the right parent pointer, so looking at that is ok. nsIContent* parent = node->GetParent(); if (parent) { // Has a parent; might not be what we want nsIContent* grandParent = parent->GetParent(); if (grandParent) { // Has a grandparent, so not what we want return; } // Check whether it's an HTML body if (node->Tag() != nsGkAtoms::body || !node->IsHTML()) { return; } } // At this point the node has no parent or it's an HTML child of the // root. We might not need to invalidate in this case (eg we might be in // XHTML or something), but chances are we want to. Play it safe. // Invalidate the viewport. nsIFrame* rootFrame = presShell->GetRootFrame(); rootFrame->InvalidateFrameSubtree(); } nsresult nsCSSFrameConstructor::StyleChangeReflow(nsIFrame* aFrame, nsChangeHint aHint) { // If the frame hasn't even received an initial reflow, then don't // send it a style-change reflow! if (aFrame->GetStateBits() & NS_FRAME_FIRST_REFLOW) return NS_OK; #ifdef DEBUG if (gNoisyContentUpdates) { printf("nsCSSFrameConstructor::StyleChangeReflow: aFrame="); nsFrame::ListTag(stdout, aFrame); printf("\n"); } #endif nsIPresShell::IntrinsicDirty dirtyType; if (aHint & nsChangeHint_ClearDescendantIntrinsics) { NS_ASSERTION(aHint & nsChangeHint_ClearAncestorIntrinsics, "Please read the comments in nsChangeHint.h"); dirtyType = nsIPresShell::eStyleChange; } else if (aHint & nsChangeHint_ClearAncestorIntrinsics) { dirtyType = nsIPresShell::eTreeChange; } else { dirtyType = nsIPresShell::eResize; } nsFrameState dirtyBits; if (aHint & nsChangeHint_NeedDirtyReflow) { dirtyBits = NS_FRAME_IS_DIRTY; } else { dirtyBits = NS_FRAME_HAS_DIRTY_CHILDREN; } do { mPresShell->FrameNeedsReflow(aFrame, dirtyType, dirtyBits); aFrame = nsLayoutUtils::GetNextContinuationOrSpecialSibling(aFrame); } while (aFrame); return NS_OK; } nsresult nsCSSFrameConstructor::CharacterDataChanged(nsIContent* aContent, CharacterDataChangeInfo* aInfo) { AUTO_LAYOUT_PHASE_ENTRY_POINT(mPresShell->GetPresContext(), FrameC); nsresult rv = NS_OK; if ((aContent->HasFlag(NS_CREATE_FRAME_IF_NON_WHITESPACE) && !aContent->TextIsOnlyWhitespace()) || (aContent->HasFlag(NS_REFRAME_IF_WHITESPACE) && aContent->TextIsOnlyWhitespace())) { #ifdef DEBUG nsIFrame* frame = aContent->GetPrimaryFrame(); NS_ASSERTION(!frame || !frame->IsGeneratedContentFrame(), "Bit should never be set on generated content"); #endif LAYOUT_PHASE_TEMP_EXIT(); nsresult rv = RecreateFramesForContent(aContent, false); LAYOUT_PHASE_TEMP_REENTER(); return rv; } // Find the child frame nsIFrame* frame = aContent->GetPrimaryFrame(); // Notify the first frame that maps the content. It will generate a reflow // command // It's possible the frame whose content changed isn't inserted into the // frame hierarchy yet, or that there is no frame that maps the content if (nullptr != frame) { #if 0 NS_FRAME_LOG(NS_FRAME_TRACE_CALLS, ("nsCSSFrameConstructor::CharacterDataChanged: content=%p[%s] subcontent=%p frame=%p", aContent, ContentTag(aContent, 0), aSubContent, frame)); #endif // Special check for text content that is a child of a letter frame. If // this happens, we should remove the letter frame, do whatever we're // planning to do with this notification, then put the letter frame back. // Note that this is basically what RecreateFramesForContent ends up doing; // the reason we dont' want to call that here is that our text content // could be native anonymous, in which case RecreateFramesForContent would // completely barf on it. And recreating the non-anonymous ancestor would // just lead us to come back into this notification (e.g. if quotes or // counters are involved), leading to a loop. nsIFrame* block = GetFloatContainingBlock(frame); bool haveFirstLetterStyle = false; if (block) { // See if the block has first-letter style applied to it. haveFirstLetterStyle = HasFirstLetterStyle(block); if (haveFirstLetterStyle) { RemoveLetterFrames(mPresShell->GetPresContext(), mPresShell, block); // Reget |frame|, since we might have killed it. // Do we really need to call CharacterDataChanged in this case, though? frame = aContent->GetPrimaryFrame(); NS_ASSERTION(frame, "Should have frame here!"); } } frame->CharacterDataChanged(aInfo); if (haveFirstLetterStyle) { RecoverLetterFrames(block); } } return rv; } NS_DECLARE_FRAME_PROPERTY(ChangeListProperty, nullptr) /** * Return true if aFrame's subtree has placeholders for out-of-flow content * whose 'position' style's bit in aPositionMask is set. */ static bool FrameHasPositionedPlaceholderDescendants(nsIFrame* aFrame, uint32_t aPositionMask) { const nsIFrame::ChildListIDs skip(nsIFrame::kAbsoluteList | nsIFrame::kFixedList); for (nsIFrame::ChildListIterator lists(aFrame); !lists.IsDone(); lists.Next()) { if (!skip.Contains(lists.CurrentID())) { for (nsFrameList::Enumerator childFrames(lists.CurrentList()); !childFrames.AtEnd(); childFrames.Next()) { nsIFrame* f = childFrames.get(); if (f->GetType() == nsGkAtoms::placeholderFrame) { nsIFrame* outOfFlow = nsPlaceholderFrame::GetRealFrameForPlaceholder(f); // If SVG text frames could appear here, they could confuse us since // they ignore their position style ... but they can't. NS_ASSERTION(!outOfFlow->IsSVGText(), "SVG text frames can't be out of flow"); if (aPositionMask & (1 << outOfFlow->GetStyleDisplay()->mPosition)) { return true; } } if (FrameHasPositionedPlaceholderDescendants(f, aPositionMask)) { return true; } } } } return false; } static bool NeedToReframeForAddingOrRemovingTransform(nsIFrame* aFrame) { MOZ_STATIC_ASSERT(0 <= NS_STYLE_POSITION_ABSOLUTE && NS_STYLE_POSITION_ABSOLUTE < 32, "Style constant out of range"); MOZ_STATIC_ASSERT(0 <= NS_STYLE_POSITION_FIXED && NS_STYLE_POSITION_FIXED < 32, "Style constant out of range"); uint32_t positionMask; // Don't call aFrame->IsPositioned here, since that returns true if // the frame already has a transform, and we want to ignore that here if (aFrame->IsAbsolutelyPositioned() || aFrame->IsRelativelyPositioned()) { // This frame is a container for abs-pos descendants whether or not it // has a transform. // So abs-pos descendants are no problem; we only need to reframe if // we have fixed-pos descendants. positionMask = 1 << NS_STYLE_POSITION_FIXED; } else { // This frame may not be a container for abs-pos descendants already. // So reframe if we have abs-pos or fixed-pos descendants. positionMask = (1 << NS_STYLE_POSITION_FIXED) | (1 << NS_STYLE_POSITION_ABSOLUTE); } return FrameHasPositionedPlaceholderDescendants(aFrame, positionMask); } nsresult nsCSSFrameConstructor::ProcessRestyledFrames(nsStyleChangeList& aChangeList) { NS_ASSERTION(!nsContentUtils::IsSafeToRunScript(), "Someone forgot a script blocker"); int32_t count = aChangeList.Count(); if (!count) return NS_OK; SAMPLE_LABEL("CSS", "ProcessRestyledFrames"); // Make sure to not rebuild quote or counter lists while we're // processing restyles BeginUpdate(); nsPresContext* presContext = mPresShell->GetPresContext(); FramePropertyTable* propTable = presContext->PropertyTable(); // Mark frames so that we skip frames that die along the way, bug 123049. // A frame can be in the list multiple times with different hints. Further // optmization is possible if nsStyleChangeList::AppendChange could coalesce int32_t index = count; while (0 <= --index) { const nsStyleChangeData* changeData; aChangeList.ChangeAt(index, &changeData); if (changeData->mFrame) { propTable->Set(changeData->mFrame, ChangeListProperty(), NS_INT32_TO_PTR(1)); } } index = count; while (0 <= --index) { nsIFrame* frame; nsIContent* content; bool didReflowThisFrame = false; nsChangeHint hint; aChangeList.ChangeAt(index, frame, content, hint); NS_ASSERTION(!(hint & nsChangeHint_AllReflowHints) || (hint & nsChangeHint_NeedReflow), "Reflow hint bits set without actually asking for a reflow"); if (frame && frame->GetContent() != content) { // XXXbz this is due to image maps messing with the primary frame of // s. See bug 135040. Remove this block once that's fixed. frame = nullptr; if (!(hint & nsChangeHint_ReconstructFrame)) { continue; } } // skip any frame that has been destroyed due to a ripple effect if (frame) { if (!propTable->Get(frame, ChangeListProperty())) continue; } if ((hint & nsChangeHint_AddOrRemoveTransform) && frame && !(hint & nsChangeHint_ReconstructFrame)) { if (NeedToReframeForAddingOrRemovingTransform(frame)) { NS_UpdateHint(hint, nsChangeHint_ReconstructFrame); } else { // We can just add this state bit unconditionally, since it's // conservative. Normally frame construction would set this if needed, // but we're not going to reconstruct the frame so we need to set it. // It's because we need to set this bit on each affected frame // that we can't coalesce nsChangeHint_AddOrRemoveTransform hints up // to ancestors (i.e. it can't be an inherited change hint). frame->AddStateBits(NS_FRAME_MAY_BE_TRANSFORMED); } } if (hint & nsChangeHint_ReconstructFrame) { // If we ever start passing true here, be careful of restyles // that involve a reframe and animations. In particular, if the // restyle we're processing here is an animation restyle, but // the style resolution we will do for the frame construction // happens async when we're not in an animation restyle already, // problems could arise. RecreateFramesForContent(content, false); } else { NS_ASSERTION(frame, "This shouldn't happen"); if (hint & nsChangeHint_UpdateEffects) { nsSVGEffects::UpdateEffects(frame); } if (hint & nsChangeHint_NeedReflow) { StyleChangeReflow(frame, hint); didReflowThisFrame = true; } if (hint & (nsChangeHint_RepaintFrame | nsChangeHint_SyncFrameView | nsChangeHint_UpdateOpacityLayer | nsChangeHint_UpdateTransformLayer | nsChangeHint_ChildrenOnlyTransform)) { ApplyRenderingChangeToTree(presContext, frame, hint); } if ((hint & nsChangeHint_RecomputePosition) && !didReflowThisFrame) { // It is possible for this to fall back to a reflow if (!RecomputePosition(frame)) { didReflowThisFrame = true; } } NS_ASSERTION(!(hint & nsChangeHint_ChildrenOnlyTransform) || (hint & nsChangeHint_UpdateOverflow), "nsChangeHint_UpdateOverflow should be passed too"); if ((hint & nsChangeHint_UpdateOverflow) && !didReflowThisFrame) { if (hint & nsChangeHint_ChildrenOnlyTransform) { // Update overflow areas of children first: nsIFrame* childFrame = GetFrameForChildrenOnlyTransformHint(frame)->GetFirstPrincipalChild(); for ( ; childFrame; childFrame = childFrame->GetNextSibling()) { NS_ABORT_IF_FALSE(childFrame->IsFrameOfType(nsIFrame::eSVG), "Not expecting non-SVG children"); childFrame->UpdateOverflow(); NS_ASSERTION(!nsLayoutUtils::GetNextContinuationOrSpecialSibling(childFrame), "SVG frames should not have continuations or special siblings"); NS_ASSERTION(childFrame->GetParent() == frame, "SVG child frame not expected to have different parent"); } } while (frame) { nsOverflowAreas* pre = static_cast (frame->Properties().Get(frame->PreTransformOverflowAreasProperty())); if (pre) { // FinishAndStoreOverflow will change the overflow areas passed in, // so make a copy. nsOverflowAreas overflowAreas = *pre; frame->FinishAndStoreOverflow(overflowAreas, frame->GetSize()); } else { frame->UpdateOverflow(); } nsIFrame* next = nsLayoutUtils::GetNextContinuationOrSpecialSibling(frame); // Update the ancestors' overflow after we have updated the overflow // for all the continuations with the same parent. if (!next || frame->GetParent() != next->GetParent()) { for (nsIFrame* ancestor = frame->GetParent(); ancestor; ancestor = ancestor->GetParent()) { if (!ancestor->UpdateOverflow()) { break; } } } frame = next; } } if (hint & nsChangeHint_UpdateCursor) { mPresShell->SynthesizeMouseMove(false); } } } EndUpdate(); // cleanup references and verify the style tree. Note that the latter needs // to happen once we've processed the whole list, since until then the tree // is not in fact in a consistent state. index = count; while (0 <= --index) { const nsStyleChangeData* changeData; aChangeList.ChangeAt(index, &changeData); if (changeData->mFrame) { propTable->Delete(changeData->mFrame, ChangeListProperty()); } #ifdef DEBUG // reget frame from content since it may have been regenerated... if (changeData->mContent) { nsIFrame* frame = changeData->mContent->GetPrimaryFrame(); if (frame) { DebugVerifyStyleTree(frame); } } else { NS_WARNING("Unable to test style tree integrity -- no content node"); } #endif } aChangeList.Clear(); return NS_OK; } void nsCSSFrameConstructor::RestyleElement(Element *aElement, nsIFrame *aPrimaryFrame, nsChangeHint aMinHint, RestyleTracker& aRestyleTracker, bool aRestyleDescendants) { NS_ASSERTION(aPrimaryFrame == aElement->GetPrimaryFrame(), "frame/content mismatch"); if (aPrimaryFrame && aPrimaryFrame->GetContent() != aElement) { // XXXbz this is due to image maps messing with the primary frame pointer // of s. See bug 135040. We can remove this block once that's fixed. aPrimaryFrame = nullptr; } NS_ASSERTION(!aPrimaryFrame || aPrimaryFrame->GetContent() == aElement, "frame/content mismatch"); if (aMinHint & nsChangeHint_ReconstructFrame) { RecreateFramesForContent(aElement, false); } else if (aPrimaryFrame) { nsStyleChangeList changeList; ComputeStyleChangeFor(aPrimaryFrame, &changeList, aMinHint, aRestyleTracker, aRestyleDescendants); ProcessRestyledFrames(changeList); } else { // no frames, reconstruct for content MaybeRecreateFramesForElement(aElement); } } nsresult nsCSSFrameConstructor::ContentStateChanged(nsIContent* aContent, nsEventStates aStateMask) { // XXXbz it would be good if this function only took Elements, but // we'd have to make ESM guarantee that usefully. if (!aContent->IsElement()) { return NS_OK; } Element* aElement = aContent->AsElement(); nsStyleSet *styleSet = mPresShell->StyleSet(); nsPresContext *presContext = mPresShell->GetPresContext(); NS_ASSERTION(styleSet, "couldn't get style set"); nsChangeHint hint = NS_STYLE_HINT_NONE; // Any change to a content state that affects which frames we construct // must lead to a frame reconstruct here if we already have a frame. // Note that we never decide through non-CSS means to not create frames // based on content states, so if we already don't have a frame we don't // need to force a reframe -- if it's needed, the HasStateDependentStyle // call will handle things. nsIFrame* primaryFrame = aElement->GetPrimaryFrame(); if (primaryFrame) { // If it's generated content, ignore LOADING/etc state changes on it. if (!primaryFrame->IsGeneratedContentFrame() && aStateMask.HasAtLeastOneOfStates(NS_EVENT_STATE_BROKEN | NS_EVENT_STATE_USERDISABLED | NS_EVENT_STATE_SUPPRESSED | NS_EVENT_STATE_LOADING)) { hint = nsChangeHint_ReconstructFrame; } else { uint8_t app = primaryFrame->GetStyleDisplay()->mAppearance; if (app) { nsITheme *theme = presContext->GetTheme(); if (theme && theme->ThemeSupportsWidget(presContext, primaryFrame, app)) { bool repaint = false; theme->WidgetStateChanged(primaryFrame, app, nullptr, &repaint); if (repaint) { NS_UpdateHint(hint, nsChangeHint_RepaintFrame); } } } } primaryFrame->ContentStatesChanged(aStateMask); } nsRestyleHint rshint = styleSet->HasStateDependentStyle(presContext, aElement, aStateMask); if (aStateMask.HasState(NS_EVENT_STATE_HOVER) && rshint != 0) { ++mHoverGeneration; } if (aStateMask.HasState(NS_EVENT_STATE_VISITED)) { // Exposing information to the page about whether the link is // visited or not isn't really something we can worry about here. // FIXME: We could probably do this a bit better. NS_UpdateHint(hint, nsChangeHint_RepaintFrame); } PostRestyleEvent(aElement, rshint, hint); return NS_OK; } void nsCSSFrameConstructor::AttributeWillChange(Element* aElement, int32_t aNameSpaceID, nsIAtom* aAttribute, int32_t aModType) { nsRestyleHint rshint = mPresShell->StyleSet()->HasAttributeDependentStyle(mPresShell->GetPresContext(), aElement, aAttribute, aModType, false); PostRestyleEvent(aElement, rshint, NS_STYLE_HINT_NONE); } void nsCSSFrameConstructor::AttributeChanged(Element* aElement, int32_t aNameSpaceID, nsIAtom* aAttribute, int32_t aModType) { // Hold onto the PresShell to prevent ourselves from being destroyed. // XXXbz how, exactly, would this attribute change cause us to be // destroyed from inside this function? nsCOMPtr shell = mPresShell; // Get the frame associated with the content which is the highest in the frame tree nsIFrame* primaryFrame = aElement->GetPrimaryFrame(); #if 0 NS_FRAME_LOG(NS_FRAME_TRACE_CALLS, ("HTMLStyleSheet::AttributeChanged: content=%p[%s] frame=%p", aContent, ContentTag(aElement, 0), frame)); #endif // the style tag has its own interpretation based on aHint nsChangeHint hint = aElement->GetAttributeChangeHint(aAttribute, aModType); bool reframe = (hint & nsChangeHint_ReconstructFrame) != 0; #ifdef MOZ_XUL // The following listbox widget trap prevents offscreen listbox widget // content from being removed and re-inserted (which is what would // happen otherwise). if (!primaryFrame && !reframe) { int32_t namespaceID; nsIAtom* tag = mDocument->BindingManager()->ResolveTag(aElement, &namespaceID); if (namespaceID == kNameSpaceID_XUL && (tag == nsGkAtoms::listitem || tag == nsGkAtoms::listcell)) return; } if (aAttribute == nsGkAtoms::tooltiptext || aAttribute == nsGkAtoms::tooltip) { nsIRootBox* rootBox = nsIRootBox::GetRootBox(mPresShell); if (rootBox) { if (aModType == nsIDOMMutationEvent::REMOVAL) rootBox->RemoveTooltipSupport(aElement); if (aModType == nsIDOMMutationEvent::ADDITION) rootBox->AddTooltipSupport(aElement); } } #endif // MOZ_XUL if (primaryFrame) { // See if we have appearance information for a theme. const nsStyleDisplay* disp = primaryFrame->GetStyleDisplay(); if (disp->mAppearance) { nsPresContext* presContext = mPresShell->GetPresContext(); nsITheme *theme = presContext->GetTheme(); if (theme && theme->ThemeSupportsWidget(presContext, primaryFrame, disp->mAppearance)) { bool repaint = false; theme->WidgetStateChanged(primaryFrame, disp->mAppearance, aAttribute, &repaint); if (repaint) NS_UpdateHint(hint, nsChangeHint_RepaintFrame); } } // let the frame deal with it now, so we don't have to deal later primaryFrame->AttributeChanged(aNameSpaceID, aAttribute, aModType); // XXXwaterson should probably check for special IB siblings // here, and propagate the AttributeChanged notification to // them, as well. Currently, inline frames don't do anything on // this notification, so it's not that big a deal. } // See if we can optimize away the style re-resolution -- must be called after // the frame's AttributeChanged() in case it does something that affects the style nsRestyleHint rshint = mPresShell->StyleSet()->HasAttributeDependentStyle(mPresShell->GetPresContext(), aElement, aAttribute, aModType, true); PostRestyleEvent(aElement, rshint, hint); } void nsCSSFrameConstructor::BeginUpdate() { NS_ASSERTION(!nsContentUtils::IsSafeToRunScript(), "Someone forgot a script blocker"); nsRootPresContext* rootPresContext = mPresShell->GetPresContext()->GetRootPresContext(); if (rootPresContext) { rootPresContext->IncrementDOMGeneration(); } ++sGlobalGenerationNumber; ++mUpdateCount; } void nsCSSFrameConstructor::EndUpdate() { if (mUpdateCount == 1) { // This is the end of our last update. Before we decrement // mUpdateCount, recalc quotes and counters as needed. RecalcQuotesAndCounters(); NS_ASSERTION(mUpdateCount == 1, "Odd update count"); } NS_ASSERTION(mUpdateCount, "Negative mUpdateCount!"); --mUpdateCount; } void nsCSSFrameConstructor::RecalcQuotesAndCounters() { if (mQuotesDirty) { mQuotesDirty = false; mQuoteList.RecalcAll(); } if (mCountersDirty) { mCountersDirty = false; mCounterManager.RecalcAll(); } NS_ASSERTION(!mQuotesDirty, "Quotes updates will be lost"); NS_ASSERTION(!mCountersDirty, "Counter updates will be lost"); } void nsCSSFrameConstructor::WillDestroyFrameTree() { #if defined(DEBUG_dbaron_off) mCounterManager.Dump(); #endif mIsDestroyingFrameTree = true; // Prevent frame tree destruction from being O(N^2) mQuoteList.Clear(); mCounterManager.Clear(); // Remove our presshell as a style flush observer. But leave // mObservingRefreshDriver true so we don't readd to it even if someone tries // to post restyle events on us from this point on for some reason. mPresShell->GetPresContext()->RefreshDriver()-> RemoveStyleFlushObserver(mPresShell); nsFrameManager::Destroy(); } //STATIC // XXXbz I'd really like this method to go away. Once we have inline-block and // I can just use that for sized broken images, that can happen, maybe. void nsCSSFrameConstructor::GetAlternateTextFor(nsIContent* aContent, nsIAtom* aTag, // content object's tag nsXPIDLString& aAltText) { // The "alt" attribute specifies alternate text that is rendered // when the image can not be displayed // If there's no "alt" attribute, and aContent is an input // element, then use the value of the "value" attribute if (!aContent->GetAttr(kNameSpaceID_None, nsGkAtoms::alt, aAltText) && nsGkAtoms::input == aTag) { // If there's no "value" attribute either, then use the localized string // for "Submit" as the alternate text. if (!aContent->GetAttr(kNameSpaceID_None, nsGkAtoms::value, aAltText)) { nsContentUtils::GetLocalizedString(nsContentUtils::eFORMS_PROPERTIES, "Submit", aAltText); } } } nsresult nsCSSFrameConstructor::CreateContinuingOuterTableFrame(nsIPresShell* aPresShell, nsPresContext* aPresContext, nsIFrame* aFrame, nsIFrame* aParentFrame, nsIContent* aContent, nsStyleContext* aStyleContext, nsIFrame** aContinuingFrame) { nsIFrame* newFrame = NS_NewTableOuterFrame(aPresShell, aStyleContext); if (newFrame) { newFrame->Init(aContent, aParentFrame, aFrame); // Create a continuing inner table frame, and if there's a caption then // replicate the caption nsFrameItems newChildFrames; nsIFrame* childFrame = aFrame->GetFirstPrincipalChild(); if (childFrame) { nsIFrame* continuingTableFrame; nsresult rv = CreateContinuingFrame(aPresContext, childFrame, newFrame, &continuingTableFrame); if (NS_FAILED(rv)) { newFrame->Destroy(); *aContinuingFrame = nullptr; return rv; } newChildFrames.AddChild(continuingTableFrame); NS_ASSERTION(!childFrame->GetNextSibling(),"there can be only one inner table frame"); } // Set the outer table's initial child list newFrame->SetInitialChildList(kPrincipalList, newChildFrames); *aContinuingFrame = newFrame; return NS_OK; } else { *aContinuingFrame = nullptr; return NS_ERROR_OUT_OF_MEMORY; } } nsresult nsCSSFrameConstructor::CreateContinuingTableFrame(nsIPresShell* aPresShell, nsPresContext* aPresContext, nsIFrame* aFrame, nsIFrame* aParentFrame, nsIContent* aContent, nsStyleContext* aStyleContext, nsIFrame** aContinuingFrame) { nsIFrame* newFrame = NS_NewTableFrame(aPresShell, aStyleContext); if (newFrame) { newFrame->Init(aContent, aParentFrame, aFrame); // Replicate any header/footer frames nsFrameItems childFrames; nsIFrame* childFrame = aFrame->GetFirstPrincipalChild(); for ( ; childFrame; childFrame = childFrame->GetNextSibling()) { // See if it's a header/footer, possibly wrapped in a scroll frame. nsTableRowGroupFrame* rowGroupFrame = static_cast(childFrame); // If the row group was continued, then don't replicate it. nsIFrame* rgNextInFlow = rowGroupFrame->GetNextInFlow(); if (rgNextInFlow) { rowGroupFrame->SetRepeatable(false); } else if (rowGroupFrame->IsRepeatable()) { // Replicate the header/footer frame. nsTableRowGroupFrame* headerFooterFrame; nsFrameItems childItems; nsFrameConstructorState state(mPresShell, mFixedContainingBlock, GetAbsoluteContainingBlock(newFrame), nullptr); state.mCreatingExtraFrames = true; headerFooterFrame = static_cast (NS_NewTableRowGroupFrame(aPresShell, rowGroupFrame->GetStyleContext())); nsIContent* headerFooter = rowGroupFrame->GetContent(); headerFooterFrame->Init(headerFooter, newFrame, nullptr); ProcessChildren(state, headerFooter, rowGroupFrame->GetStyleContext(), headerFooterFrame, true, childItems, false, nullptr); NS_ASSERTION(state.mFloatedItems.IsEmpty(), "unexpected floated element"); headerFooterFrame->SetInitialChildList(kPrincipalList, childItems); headerFooterFrame->SetRepeatable(true); // Table specific initialization headerFooterFrame->InitRepeatedFrame(aPresContext, rowGroupFrame); // XXX Deal with absolute and fixed frames... childFrames.AddChild(headerFooterFrame); } } // Set the table frame's initial child list newFrame->SetInitialChildList(kPrincipalList, childFrames); *aContinuingFrame = newFrame; return NS_OK; } else { *aContinuingFrame = nullptr; return NS_ERROR_OUT_OF_MEMORY; } } nsresult nsCSSFrameConstructor::CreateContinuingFrame(nsPresContext* aPresContext, nsIFrame* aFrame, nsIFrame* aParentFrame, nsIFrame** aContinuingFrame, bool aIsFluid) { nsIPresShell* shell = aPresContext->PresShell(); nsStyleContext* styleContext = aFrame->GetStyleContext(); nsIFrame* newFrame = nullptr; nsresult rv = NS_OK; nsIFrame* nextContinuation = aFrame->GetNextContinuation(); nsIFrame* nextInFlow = aFrame->GetNextInFlow(); // Use the frame type to determine what type of frame to create nsIAtom* frameType = aFrame->GetType(); nsIContent* content = aFrame->GetContent(); NS_ASSERTION(aFrame->GetSplittableType() != NS_FRAME_NOT_SPLITTABLE, "why CreateContinuingFrame for a non-splittable frame?"); if (nsGkAtoms::textFrame == frameType) { newFrame = NS_NewContinuingTextFrame(shell, styleContext); if (newFrame) { newFrame->Init(content, aParentFrame, aFrame); } } else if (nsGkAtoms::inlineFrame == frameType) { newFrame = NS_NewInlineFrame(shell, styleContext); if (newFrame) { newFrame->Init(content, aParentFrame, aFrame); } } else if (nsGkAtoms::blockFrame == frameType) { newFrame = NS_NewBlockFrame(shell, styleContext); if (newFrame) { newFrame->Init(content, aParentFrame, aFrame); } #ifdef MOZ_XUL } else if (nsGkAtoms::XULLabelFrame == frameType) { newFrame = NS_NewXULLabelFrame(shell, styleContext); if (newFrame) { newFrame->Init(content, aParentFrame, aFrame); } #endif } else if (nsGkAtoms::columnSetFrame == frameType) { newFrame = NS_NewColumnSetFrame(shell, styleContext, 0); if (newFrame) { newFrame->Init(content, aParentFrame, aFrame); } } else if (nsGkAtoms::pageFrame == frameType) { nsIFrame* canvasFrame; rv = ConstructPageFrame(shell, aPresContext, aParentFrame, aFrame, newFrame, canvasFrame); } else if (nsGkAtoms::tableOuterFrame == frameType) { rv = CreateContinuingOuterTableFrame(shell, aPresContext, aFrame, aParentFrame, content, styleContext, &newFrame); } else if (nsGkAtoms::tableFrame == frameType) { rv = CreateContinuingTableFrame(shell, aPresContext, aFrame, aParentFrame, content, styleContext, &newFrame); } else if (nsGkAtoms::tableRowGroupFrame == frameType) { newFrame = NS_NewTableRowGroupFrame(shell, styleContext); if (newFrame) { newFrame->Init(content, aParentFrame, aFrame); } } else if (nsGkAtoms::tableRowFrame == frameType) { newFrame = NS_NewTableRowFrame(shell, styleContext); if (newFrame) { newFrame->Init(content, aParentFrame, aFrame); // Create a continuing frame for each table cell frame nsFrameItems newChildList; nsIFrame* cellFrame = aFrame->GetFirstPrincipalChild(); while (cellFrame) { // See if it's a table cell frame if (IS_TABLE_CELL(cellFrame->GetType())) { nsIFrame* continuingCellFrame; rv = CreateContinuingFrame(aPresContext, cellFrame, newFrame, &continuingCellFrame); if (NS_FAILED(rv)) { newChildList.DestroyFrames(); newFrame->Destroy(); *aContinuingFrame = nullptr; return NS_ERROR_OUT_OF_MEMORY; } newChildList.AddChild(continuingCellFrame); } cellFrame = cellFrame->GetNextSibling(); } // Set the table cell's initial child list newFrame->SetInitialChildList(kPrincipalList, newChildList); } } else if (IS_TABLE_CELL(frameType)) { // Warning: If you change this and add a wrapper frame around table cell // frames, make sure Bug 368554 doesn't regress! // See IsInAutoWidthTableCellForQuirk() in nsImageFrame.cpp. newFrame = NS_NewTableCellFrame(shell, styleContext, IsBorderCollapse(aParentFrame)); if (newFrame) { newFrame->Init(content, aParentFrame, aFrame); // Create a continuing area frame nsIFrame* continuingBlockFrame; nsIFrame* blockFrame = aFrame->GetFirstPrincipalChild(); rv = CreateContinuingFrame(aPresContext, blockFrame, newFrame, &continuingBlockFrame); if (NS_FAILED(rv)) { newFrame->Destroy(); *aContinuingFrame = nullptr; return rv; } // Set the table cell's initial child list SetInitialSingleChild(newFrame, continuingBlockFrame); } } else if (nsGkAtoms::lineFrame == frameType) { newFrame = NS_NewFirstLineFrame(shell, styleContext); if (newFrame) { newFrame->Init(content, aParentFrame, aFrame); } } else if (nsGkAtoms::letterFrame == frameType) { newFrame = NS_NewFirstLetterFrame(shell, styleContext); if (newFrame) { newFrame->Init(content, aParentFrame, aFrame); } } else if (nsGkAtoms::imageFrame == frameType) { newFrame = NS_NewImageFrame(shell, styleContext); if (newFrame) { newFrame->Init(content, aParentFrame, aFrame); } } else if (nsGkAtoms::imageControlFrame == frameType) { newFrame = NS_NewImageControlFrame(shell, styleContext); if (newFrame) { newFrame->Init(content, aParentFrame, aFrame); } } else if (nsGkAtoms::placeholderFrame == frameType) { // create a continuing out of flow frame nsIFrame* oofFrame = nsPlaceholderFrame::GetRealFrameForPlaceholder(aFrame); nsIFrame* oofContFrame; rv = CreateContinuingFrame(aPresContext, oofFrame, aParentFrame, &oofContFrame); if (NS_FAILED(rv)) { *aContinuingFrame = nullptr; return rv; } // create a continuing placeholder frame rv = CreatePlaceholderFrameFor(shell, content, oofContFrame, styleContext, aParentFrame, aFrame, aFrame->GetStateBits() & PLACEHOLDER_TYPE_MASK, &newFrame); if (NS_FAILED(rv)) { oofContFrame->Destroy(); *aContinuingFrame = nullptr; return rv; } } else if (nsGkAtoms::fieldSetFrame == frameType) { newFrame = NS_NewFieldSetFrame(shell, styleContext); if (newFrame) { newFrame->Init(content, aParentFrame, aFrame); // Create a continuing area frame // XXXbz we really shouldn't have to do this by hand! nsIFrame* continuingBlockFrame; nsIFrame* blockFrame = GetFieldSetBlockFrame(aFrame); rv = CreateContinuingFrame(aPresContext, blockFrame, newFrame, &continuingBlockFrame); if (NS_FAILED(rv)) { newFrame->Destroy(); *aContinuingFrame = nullptr; return rv; } // Set the fieldset's initial child list SetInitialSingleChild(newFrame, continuingBlockFrame); } } else if (nsGkAtoms::legendFrame == frameType) { newFrame = NS_NewLegendFrame(shell, styleContext); if (newFrame) { newFrame->Init(content, aParentFrame, aFrame); } } else { NS_NOTREACHED("unexpected frame type"); *aContinuingFrame = nullptr; return NS_ERROR_UNEXPECTED; } *aContinuingFrame = newFrame; if (!newFrame) { return NS_ERROR_OUT_OF_MEMORY; } // Init() set newFrame to be a fluid continuation of aFrame. // If we want a non-fluid continuation, we need to call SetPrevContinuation() // to reset NS_FRAME_IS_FLUID_CONTINUATION. if (!aIsFluid) { newFrame->SetPrevContinuation(aFrame); } // A continuation of generated content is also generated content if (aFrame->GetStateBits() & NS_FRAME_GENERATED_CONTENT) { newFrame->AddStateBits(NS_FRAME_GENERATED_CONTENT); } // A continuation of an out-of-flow is also an out-of-flow if (aFrame->GetStateBits() & NS_FRAME_OUT_OF_FLOW) { newFrame->AddStateBits(NS_FRAME_OUT_OF_FLOW); } if (nextInFlow) { nextInFlow->SetPrevInFlow(newFrame); newFrame->SetNextInFlow(nextInFlow); } else if (nextContinuation) { nextContinuation->SetPrevContinuation(newFrame); newFrame->SetNextContinuation(nextContinuation); } NS_POSTCONDITION(!newFrame->GetNextSibling(), "unexpected sibling"); return NS_OK; } nsresult nsCSSFrameConstructor::ReplicateFixedFrames(nsPageContentFrame* aParentFrame) { // Now deal with fixed-pos things.... They should appear on all pages, // so we want to move over the placeholders when processing the child // of the pageContentFrame. nsIFrame* prevPageContentFrame = aParentFrame->GetPrevInFlow(); if (!prevPageContentFrame) { return NS_OK; } nsIFrame* canvasFrame = aParentFrame->GetFirstPrincipalChild(); nsIFrame* prevCanvasFrame = prevPageContentFrame->GetFirstPrincipalChild(); if (!canvasFrame || !prevCanvasFrame) { // document's root element frame missing return NS_ERROR_UNEXPECTED; } nsFrameItems fixedPlaceholders; nsIFrame* firstFixed = prevPageContentFrame->GetFirstChild(nsIFrame::kFixedList); if (!firstFixed) { return NS_OK; } // Don't allow abs-pos descendants of the fixed content to escape the content. // This should not normally be possible (because fixed-pos elements should // be absolute containers) but fixed-pos tables currently aren't abs-pos // containers. nsFrameConstructorState state(mPresShell, aParentFrame, nullptr, mRootElementFrame); state.mCreatingExtraFrames = true; // We can't use an ancestor filter here, because we're not going to // be usefully recurring down the tree. This means that other // places in frame construction can't assume a filter is // initialized! // Iterate across fixed frames and replicate each whose placeholder is a // descendant of aFrame. (We don't want to explicitly copy placeholders that // are within fixed frames, because that would cause duplicates on the new // page - bug 389619) for (nsIFrame* fixed = firstFixed; fixed; fixed = fixed->GetNextSibling()) { nsIFrame* prevPlaceholder = GetPlaceholderFrameFor(fixed); if (prevPlaceholder && nsLayoutUtils::IsProperAncestorFrame(prevCanvasFrame, prevPlaceholder)) { // We want to use the same style as the primary style frame for // our content nsIContent* content = fixed->GetContent(); nsStyleContext* styleContext = nsLayoutUtils::GetStyleFrame(content->GetPrimaryFrame())-> GetStyleContext(); FrameConstructionItemList items; AddFrameConstructionItemsInternal(state, content, canvasFrame, content->Tag(), content->GetNameSpaceID(), true, styleContext, ITEM_ALLOW_XBL_BASE | ITEM_ALLOW_PAGE_BREAK, items); items.SetTriedConstructingFrames(); for (FCItemIterator iter(items); !iter.IsDone(); iter.Next()) { NS_ASSERTION(iter.item().DesiredParentType() == GetParentType(canvasFrame), "This is not going to work"); nsresult rv = ConstructFramesFromItem(state, iter, canvasFrame, fixedPlaceholders); NS_ENSURE_SUCCESS(rv, rv); } } } // Add the placeholders to our primary child list. // XXXbz this is a little screwed up, since the fixed frames will have // broken auto-positioning. Oh, well. NS_ASSERTION(!canvasFrame->GetFirstPrincipalChild(), "leaking frames; doc root continuation must be empty"); canvasFrame->SetInitialChildList(kPrincipalList, fixedPlaceholders); return NS_OK; } nsresult nsCSSFrameConstructor::GetInsertionPoint(nsIFrame* aParentFrame, nsIContent* aChildContent, nsIFrame** aInsertionPoint, bool* aMultiple) { // Make the insertion point be the parent frame by default, in case // we have to bail early. *aInsertionPoint = aParentFrame; nsIContent* container = aParentFrame->GetContent(); if (!container) return NS_OK; nsBindingManager *bindingManager = mDocument->BindingManager(); nsIContent* insertionElement; if (aChildContent) { // We've got an explicit insertion child. Check to see if it's // anonymous. if (aChildContent->GetBindingParent() == container) { // This child content is anonymous. Don't use the insertion // point, since that's only for the explicit kids. return NS_OK; } uint32_t index; insertionElement = bindingManager->GetInsertionPoint(container, aChildContent, &index); } else { bool multiple; uint32_t index; insertionElement = bindingManager->GetSingleInsertionPoint(container, &index, &multiple); if (multiple && aMultiple) *aMultiple = multiple; // Record the fact that filters are in use. } if (insertionElement) { nsIFrame* insertionPoint = insertionElement->GetPrimaryFrame(); if (insertionPoint) { // Use the content insertion frame of the insertion point. insertionPoint = insertionPoint->GetContentInsertionFrame(); if (insertionPoint && insertionPoint != aParentFrame) GetInsertionPoint(insertionPoint, aChildContent, aInsertionPoint, aMultiple); } else { // There was no frame created yet for the insertion point. *aInsertionPoint = nullptr; } } // fieldsets have multiple insertion points. Note that we might // have to look at insertionElement here... if (aMultiple && !*aMultiple) { nsIContent* content = insertionElement ? insertionElement : container; if (content->IsHTML(nsGkAtoms::fieldset)) { *aMultiple = true; } } return NS_OK; } // Capture state for the frame tree rooted at the frame associated with the // content object, aContent void nsCSSFrameConstructor::CaptureStateForFramesOf(nsIContent* aContent, nsILayoutHistoryState* aHistoryState) { if (!aHistoryState) { return; } nsIFrame* frame = aContent->GetPrimaryFrame(); if (frame == mRootElementFrame) { frame = mFixedContainingBlock; } for ( ; frame; frame = nsLayoutUtils::GetNextContinuationOrSpecialSibling(frame)) { CaptureFrameState(frame, aHistoryState); } } static bool EqualURIs(mozilla::css::URLValue *aURI1, mozilla::css::URLValue *aURI2) { return aURI1 == aURI2 || // handle null==null, and optimize (aURI1 && aURI2 && aURI1->URIEquals(*aURI2)); } nsresult nsCSSFrameConstructor::MaybeRecreateFramesForElement(Element* aElement) { nsRefPtr oldContext = GetUndisplayedContent(aElement); if (!oldContext) { return NS_OK; } // The parent has a frame, so try resolving a new context. nsRefPtr newContext = mPresShell->StyleSet()-> ResolveStyleFor(aElement, oldContext->GetParent()); ChangeUndisplayedContent(aElement, newContext); const nsStyleDisplay* disp = newContext->GetStyleDisplay(); if (disp->mDisplay == NS_STYLE_DISPLAY_NONE) { // We can skip trying to recreate frames here, but only if our style // context does not have a binding URI that differs from our old one. // Otherwise, we should try to recreate, because we may want to apply the // new binding if (!disp->mBinding) { return NS_OK; } const nsStyleDisplay* oldDisp = oldContext->PeekStyleDisplay(); if (oldDisp && EqualURIs(disp->mBinding, oldDisp->mBinding)) { return NS_OK; } } return RecreateFramesForContent(aElement, false); } static nsIFrame* FindFirstNonWhitespaceChild(nsIFrame* aParentFrame) { nsIFrame* f = aParentFrame->GetFirstPrincipalChild(); while (f && f->GetType() == nsGkAtoms::textFrame && f->GetContent()->TextIsOnlyWhitespace()) { f = f->GetNextSibling(); } return f; } static nsIFrame* FindNextNonWhitespaceSibling(nsIFrame* aFrame) { nsIFrame* f = aFrame; do { f = f->GetNextSibling(); } while (f && f->GetType() == nsGkAtoms::textFrame && f->GetContent()->TextIsOnlyWhitespace()); return f; } bool nsCSSFrameConstructor::MaybeRecreateContainerForFrameRemoval(nsIFrame* aFrame, nsresult* aResult) { NS_PRECONDITION(aFrame, "Must have a frame"); NS_PRECONDITION(aFrame->GetParent(), "Frame shouldn't be root"); NS_PRECONDITION(aResult, "Null out param?"); NS_PRECONDITION(aFrame == aFrame->GetFirstContinuation(), "aFrame not the result of GetPrimaryFrame()?"); if (IsFrameSpecial(aFrame)) { // The removal functions can't handle removal of an {ib} split directly; we // need to rebuild the containing block. #ifdef DEBUG if (gNoisyContentUpdates) { printf("nsCSSFrameConstructor::MaybeRecreateContainerForFrameRemoval: " "frame="); nsFrame::ListTag(stdout, aFrame); printf(" is special\n"); } #endif *aResult = ReframeContainingBlock(aFrame); return true; } if (aFrame->GetContentInsertionFrame()->GetType() == nsGkAtoms::legendFrame && aFrame->GetParent()->GetType() == nsGkAtoms::fieldSetFrame) { // When we remove the legend for a fieldset, we should reframe // the fieldset to ensure another legend is used, if there is one *aResult = RecreateFramesForContent(aFrame->GetParent()->GetContent(), false); return true; } // Now check for possibly needing to reconstruct due to a pseudo parent nsIFrame* inFlowFrame = (aFrame->GetStateBits() & NS_FRAME_OUT_OF_FLOW) ? GetPlaceholderFrameFor(aFrame) : aFrame; NS_ASSERTION(inFlowFrame, "How did that happen?"); nsIFrame* parent = inFlowFrame->GetParent(); if (IsTablePseudo(parent)) { if (FindFirstNonWhitespaceChild(parent) == inFlowFrame || !FindNextNonWhitespaceSibling(inFlowFrame->GetLastContinuation()) || // If we're a table-column-group, then the GetFirstChild check above is // not going to catch cases when we're the first child. (inFlowFrame->GetType() == nsGkAtoms::tableColGroupFrame && parent->GetFirstChild(nsIFrame::kColGroupList) == inFlowFrame) || // Similar if we're a table-caption. (inFlowFrame->GetType() == nsGkAtoms::tableCaptionFrame && parent->GetFirstChild(nsIFrame::kCaptionList) == inFlowFrame)) { // We're the first or last frame in the pseudo. Need to reframe. // Good enough to recreate frames for |parent|'s content *aResult = RecreateFramesForContent(parent->GetContent(), true); return true; } } // Might need to reconstruct things if this frame's nextSibling is a table // pseudo, since removal of this frame might mean that this pseudo needs to // get merged with the frame's prevSibling. // XXXbz it would be really nice if we had the prevSibling here too, to check // whether this is in fact the case... nsIFrame* nextSibling = FindNextNonWhitespaceSibling(inFlowFrame->GetLastContinuation()); NS_ASSERTION(!IsTablePseudo(inFlowFrame), "Shouldn't happen here"); if (nextSibling && IsTablePseudo(nextSibling)) { #ifdef DEBUG if (gNoisyContentUpdates) { printf("nsCSSFrameConstructor::MaybeRecreateContainerForFrameRemoval: " "frame="); nsFrame::ListTag(stdout, aFrame); printf(" has a table pseudo next sibling of different type\n"); } #endif // Good enough to recreate frames for aFrame's parent's content; even if // aFrame's parent is a table pseudo, that'll be the right content node. *aResult = RecreateFramesForContent(parent->GetContent(), true); return true; } #ifdef MOZ_FLEXBOX // Might need to reconstruct things if the removed frame's nextSibling is an // anonymous flex item. The removed frame might've been what divided two // runs of inline content into two anonymous flex items, which would now // need to be merged. // NOTE: It's fine that we've advanced nextSibling past whitespace (up above); // we're only interested in anonymous flex items here, and those can never // be adjacent to whitespace, since they absorb contiguous runs of inline // non-replaced content (including whitespace). if (nextSibling && IsAnonymousFlexItem(nextSibling)) { NS_ABORT_IF_FALSE(parent->GetType() == nsGkAtoms::flexContainerFrame, "anonymous flex items should only exist as children " "of flex container frames"); #ifdef DEBUG if (gNoisyContentUpdates) { printf("nsCSSFrameConstructor::MaybeRecreateContainerForFrameRemoval: " "frame="); nsFrame::ListTag(stdout, aFrame); printf(" has an anonymous flex item as its next sibling\n"); } #endif // DEBUG // Recreate frames for the flex container (the removed frame's parent) *aResult = RecreateFramesForContent(parent->GetContent(), true); return true; } // Might need to reconstruct things if the removed frame's nextSibling is // null and its parent is an anonymous flex item. (This might be the last // remaining child of that anonymous flex item, which can then go away.) if (!nextSibling && IsAnonymousFlexItem(parent)) { NS_ABORT_IF_FALSE(parent->GetParent() && parent->GetParent()->GetType() == nsGkAtoms::flexContainerFrame, "anonymous flex items should only exist as children " "of flex container frames"); #ifdef DEBUG if (gNoisyContentUpdates) { printf("nsCSSFrameConstructor::MaybeRecreateContainerForFrameRemoval: " "frame="); nsFrame::ListTag(stdout, aFrame); printf(" has an anonymous flex item as its parent\n"); } #endif // DEBUG // Recreate frames for the flex container (the removed frame's grandparent) *aResult = RecreateFramesForContent(parent->GetParent()->GetContent(), true); return true; } #endif // MOZ_FLEXBOX #ifdef MOZ_XUL if (aFrame->GetType() == nsGkAtoms::popupSetFrame) { nsIRootBox* rootBox = nsIRootBox::GetRootBox(mPresShell); if (rootBox && rootBox->GetPopupSetFrame() == aFrame) { *aResult = ReconstructDocElementHierarchy(); return true; } } #endif // Reconstruct if inflowFrame is parent's only child, and parent is, or has, // a non-fluid continuation, i.e. it was split by bidi resolution if (!inFlowFrame->GetPrevSibling() && !inFlowFrame->GetNextSibling() && ((parent->GetPrevContinuation() && !parent->GetPrevInFlow()) || (parent->GetNextContinuation() && !parent->GetNextInFlow()))) { *aResult = RecreateFramesForContent(parent->GetContent(), true); return true; } // We might still need to reconstruct things if the parent of inFlowFrame is // special, since in that case the removal of aFrame might affect the // splitting of its parent. if (!IsFrameSpecial(parent)) { return false; } // If inFlowFrame is not the only in-flow child of |parent|, then removing // it will change nothing about the {ib} split. if (inFlowFrame != parent->GetFirstPrincipalChild() || inFlowFrame->GetLastContinuation()->GetNextSibling()) { return false; } // If the parent is the first or last part of the {ib} split, then // removing one of its kids will have no effect on the splitting. // Get the first continuation up front so we don't have to do it twice. nsIFrame* parentFirstContinuation = parent->GetFirstContinuation(); if (!GetSpecialSibling(parentFirstContinuation) || !GetSpecialPrevSibling(parentFirstContinuation)) { return false; } #ifdef DEBUG if (gNoisyContentUpdates) { printf("nsCSSFrameConstructor::MaybeRecreateContainerForFrameRemoval: " "frame="); nsFrame::ListTag(stdout, parent); printf(" is special\n"); } #endif *aResult = ReframeContainingBlock(parent); return true; } nsresult nsCSSFrameConstructor::RecreateFramesForContent(nsIContent* aContent, bool aAsyncInsert) { NS_PRECONDITION(!aAsyncInsert || aContent->IsElement(), "Can only insert elements async"); // If there is no document, we don't want to recreate frames for it. (You // shouldn't generally be giving this method content without a document // anyway). // Rebuilding the frame tree can have bad effects, especially if it's the // frame tree for chrome (see bug 157322). NS_ENSURE_TRUE(aContent->GetDocument(), NS_ERROR_FAILURE); // Is the frame `special'? If so, we need to reframe the containing // block *here*, rather than trying to remove and re-insert the // content (which would otherwise result in *two* nested reframe // containing block from ContentRemoved() and ContentInserted(), // below!). We'd really like to optimize away one of those // containing block reframes, hence the code here. nsIFrame* frame = aContent->GetPrimaryFrame(); if (frame && frame->IsFrameOfType(nsIFrame::eMathML)) { // Reframe the topmost MathML element to prevent exponential blowup // (see bug 397518) while (true) { nsIContent* parentContent = aContent->GetParent(); nsIFrame* parentContentFrame = parentContent->GetPrimaryFrame(); if (!parentContentFrame || !parentContentFrame->IsFrameOfType(nsIFrame::eMathML)) break; aContent = parentContent; frame = parentContentFrame; } } if (frame) { nsIFrame* nonGeneratedAncestor = nsLayoutUtils::GetNonGeneratedAncestor(frame); if (nonGeneratedAncestor->GetContent() != aContent) { return RecreateFramesForContent(nonGeneratedAncestor->GetContent(), aAsyncInsert); } nsIFrame* parent = frame->GetParent(); nsIContent* parentContent = parent ? parent->GetContent() : nullptr; // If the parent frame is a leaf then the subsequent insert will fail to // create a frame, so we need to recreate the parent content. This happens // with native anonymous content from the editor. if (parent && parent->IsLeaf() && parentContent && parentContent != aContent) { return RecreateFramesForContent(parentContent, aAsyncInsert); } } nsresult rv = NS_OK; if (frame && MaybeRecreateContainerForFrameRemoval(frame, &rv)) { return rv; } nsINode* containerNode = aContent->GetParentNode(); // XXXbz how can containerNode be null here? if (containerNode) { // Before removing the frames associated with the content object, // ask them to save their state onto a temporary state object. CaptureStateForFramesOf(aContent, mTempFrameTreeState); // Need the nsIContent parent, which might be null here, since we need to // pass it to ContentInserted and ContentRemoved. nsCOMPtr container = aContent->GetParent(); // Remove the frames associated with the content object. bool didReconstruct; rv = ContentRemoved(container, aContent, aContent->IsRootOfAnonymousSubtree() ? nullptr : aContent->GetNextSibling(), REMOVE_FOR_RECONSTRUCTION, &didReconstruct); if (NS_SUCCEEDED(rv) && !didReconstruct) { // Now, recreate the frames associated with this content object. If // ContentRemoved triggered reconstruction, then we don't need to do this // because the frames will already have been built. if (aAsyncInsert) { PostRestyleEvent(aContent->AsElement(), nsRestyleHint(0), nsChangeHint_ReconstructFrame); } else { rv = ContentInserted(container, aContent, mTempFrameTreeState, false); } } } return rv; } ////////////////////////////////////////////////////////////////////// // Block frame construction code already_AddRefed nsCSSFrameConstructor::GetFirstLetterStyle(nsIContent* aContent, nsStyleContext* aStyleContext) { if (aContent) { return mPresShell->StyleSet()-> ResolvePseudoElementStyle(aContent->AsElement(), nsCSSPseudoElements::ePseudo_firstLetter, aStyleContext); } return nullptr; } already_AddRefed nsCSSFrameConstructor::GetFirstLineStyle(nsIContent* aContent, nsStyleContext* aStyleContext) { if (aContent) { return mPresShell->StyleSet()-> ResolvePseudoElementStyle(aContent->AsElement(), nsCSSPseudoElements::ePseudo_firstLine, aStyleContext); } return nullptr; } // Predicate to see if a given content (block element) has // first-letter style applied to it. bool nsCSSFrameConstructor::ShouldHaveFirstLetterStyle(nsIContent* aContent, nsStyleContext* aStyleContext) { return nsLayoutUtils::HasPseudoStyle(aContent, aStyleContext, nsCSSPseudoElements::ePseudo_firstLetter, mPresShell->GetPresContext()); } bool nsCSSFrameConstructor::HasFirstLetterStyle(nsIFrame* aBlockFrame) { NS_PRECONDITION(aBlockFrame, "Need a frame"); NS_ASSERTION(nsLayoutUtils::GetAsBlock(aBlockFrame), "Not a block frame?"); return (aBlockFrame->GetStateBits() & NS_BLOCK_HAS_FIRST_LETTER_STYLE) != 0; } bool nsCSSFrameConstructor::ShouldHaveFirstLineStyle(nsIContent* aContent, nsStyleContext* aStyleContext) { bool hasFirstLine = nsLayoutUtils::HasPseudoStyle(aContent, aStyleContext, nsCSSPseudoElements::ePseudo_firstLine, mPresShell->GetPresContext()); if (hasFirstLine) { // But disable for fieldsets int32_t namespaceID; nsIAtom* tag = mDocument->BindingManager()->ResolveTag(aContent, &namespaceID); // This check must match the one in FindHTMLData. hasFirstLine = tag != nsGkAtoms::fieldset || namespaceID != kNameSpaceID_XHTML; } return hasFirstLine; } void nsCSSFrameConstructor::ShouldHaveSpecialBlockStyle(nsIContent* aContent, nsStyleContext* aStyleContext, bool* aHaveFirstLetterStyle, bool* aHaveFirstLineStyle) { *aHaveFirstLetterStyle = ShouldHaveFirstLetterStyle(aContent, aStyleContext); *aHaveFirstLineStyle = ShouldHaveFirstLineStyle(aContent, aStyleContext); } /* static */ const nsCSSFrameConstructor::PseudoParentData nsCSSFrameConstructor::sPseudoParentData[eParentTypeCount] = { { // Cell FULL_CTOR_FCDATA(FCDATA_IS_TABLE_PART | FCDATA_SKIP_FRAMESET | FCDATA_USE_CHILD_ITEMS | FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeRow), &nsCSSFrameConstructor::ConstructTableCell), &nsCSSAnonBoxes::tableCell }, { // Row FULL_CTOR_FCDATA(FCDATA_IS_TABLE_PART | FCDATA_SKIP_FRAMESET | FCDATA_USE_CHILD_ITEMS | FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeRowGroup), &nsCSSFrameConstructor::ConstructTableRow), &nsCSSAnonBoxes::tableRow }, { // Row group FCDATA_DECL(FCDATA_IS_TABLE_PART | FCDATA_SKIP_FRAMESET | FCDATA_DISALLOW_OUT_OF_FLOW | FCDATA_USE_CHILD_ITEMS | FCDATA_SKIP_ABSPOS_PUSH | FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeTable), NS_NewTableRowGroupFrame), &nsCSSAnonBoxes::tableRowGroup }, { // Column group FCDATA_DECL(FCDATA_IS_TABLE_PART | FCDATA_SKIP_FRAMESET | FCDATA_DISALLOW_OUT_OF_FLOW | FCDATA_USE_CHILD_ITEMS | FCDATA_SKIP_ABSPOS_PUSH | FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeTable), NS_NewTableColGroupFrame), &nsCSSAnonBoxes::tableColGroup }, { // Table FULL_CTOR_FCDATA(FCDATA_SKIP_FRAMESET | FCDATA_USE_CHILD_ITEMS, &nsCSSFrameConstructor::ConstructTable), &nsCSSAnonBoxes::table } }; #ifdef MOZ_FLEXBOX void nsCSSFrameConstructor::CreateNeededAnonFlexItems( nsFrameConstructorState& aState, FrameConstructionItemList& aItems, nsIFrame* aParentFrame) { NS_ABORT_IF_FALSE(aParentFrame->GetType() == nsGkAtoms::flexContainerFrame, "Should only be called for items in a flex container frame"); if (aItems.IsEmpty()) { return; } FCItemIterator iter(aItems); do { // Advance iter past children that don't want to be wrapped if (iter.SkipItemsThatDontNeedAnonFlexItem(aState)) { // Hit the end of the items without finding any remaining children that // need to be wrapped. We're finished! return; } // If our next potentially-wrappable child is whitespace, then see if // there's anything wrappable immediately after it. If not, we just drop // the whitespace and move on. (We're not supposed to create any anonymous // flex items that _only_ contain whitespace). if (iter.item().IsWhitespace(aState)) { FCItemIterator afterWhitespaceIter(iter); bool hitEnd = afterWhitespaceIter.SkipWhitespace(aState); bool nextChildNeedsAnonFlexItem = !hitEnd && afterWhitespaceIter.item().NeedsAnonFlexItem(aState); if (!nextChildNeedsAnonFlexItem) { // There's nothing after the whitespace that we need to wrap, so we // just drop this run of whitespace. iter.DeleteItemsTo(afterWhitespaceIter); if (hitEnd) { // Nothing left to do -- we're finished! return; } // else, we have a next child and it does not want to be wrapped. So, // we jump back to the beginning of the loop to skip over that child // (and anything else non-wrappable after it) NS_ABORT_IF_FALSE(!iter.IsDone() && !iter.item().NeedsAnonFlexItem(aState), "hitEnd and/or nextChildNeedsAnonFlexItem lied"); continue; } } // Now |iter| points to the first child that needs to be wrapped in an // anonymous flex item. Now we see how many children after it also want // to be wrapped in an anonymous flex item. FCItemIterator endIter(iter); // iterator to find the end of the group endIter.SkipItemsThatNeedAnonFlexItem(aState); NS_ASSERTION(iter != endIter, "Should've had at least one wrappable child to seek past"); // Now, we create the anonymous flex item to contain the children // between |iter| and |endIter|. nsIAtom* pseudoType = nsCSSAnonBoxes::anonymousFlexItem; nsStyleContext* parentStyle = aParentFrame->GetStyleContext(); nsIContent* parentContent = aParentFrame->GetContent(); nsRefPtr wrapperStyle = mPresShell->StyleSet()->ResolveAnonymousBoxStyle(pseudoType, parentStyle); static const FrameConstructionData sBlockFormattingContextFCData = FCDATA_DECL(FCDATA_SKIP_FRAMESET | FCDATA_USE_CHILD_ITEMS, NS_NewBlockFormattingContext); FrameConstructionItem* newItem = new FrameConstructionItem(&sBlockFormattingContextFCData, // Use the content of our parent frame parentContent, // Lie about the tag; it doesn't matter anyway pseudoType, iter.item().mNameSpaceID, // no pending binding nullptr, wrapperStyle.forget(), true); newItem->mIsAllInline = newItem->mHasInlineEnds = newItem->mStyleContext->GetStyleDisplay()->IsInlineOutsideStyle(); newItem->mIsBlock = !newItem->mIsAllInline; NS_ABORT_IF_FALSE(!newItem->mIsAllInline && newItem->mIsBlock, "expecting anonymous flex items to be block-level " "(this will make a difference when we encounter " "'flex-align: baseline')"); // Anonymous flex items induce line boundaries around their // contents. newItem->mChildItems.SetLineBoundaryAtStart(true); newItem->mChildItems.SetLineBoundaryAtEnd(true); // The parent of the items in aItems is also the parent of the items // in mChildItems newItem->mChildItems.SetParentHasNoXBLChildren( aItems.ParentHasNoXBLChildren()); // Eat up all items between |iter| and |endIter| and put them in our // wrapper. This advances |iter| to point to |endIter|. iter.AppendItemsToList(endIter, newItem->mChildItems); iter.InsertItem(newItem); } while (!iter.IsDone()); } #endif // MOZ_FLEXBOX /* * This function works as follows: we walk through the child list (aItems) and * find items that cannot have aParentFrame as their parent. We wrap * continuous runs of such items into a FrameConstructionItem for a frame that * gets them closer to their desired parents. For example, a run of non-row * children of a row-group will get wrapped in a row. When we later construct * the frame for this wrapper (in this case for the row), it'll be the correct * parent for the cells in the set of items we wrapped or we'll wrap cells * around everything else. At the end of this method, aItems is guaranteed to * contain only items for frames that can be direct kids of aParentFrame. */ void nsCSSFrameConstructor::CreateNeededTablePseudos(nsFrameConstructorState& aState, FrameConstructionItemList& aItems, nsIFrame* aParentFrame) { ParentType ourParentType = GetParentType(aParentFrame); if (aItems.AllWantParentType(ourParentType)) { // Nothing to do here return; } FCItemIterator iter(aItems); do { if (iter.SkipItemsWantingParentType(ourParentType)) { // Nothing else to do here; we're finished return; } // Now we're pointing to the first child that wants a different parent // type. // Now try to figure out what kids we can group together. We can generally // group everything that has a different desired parent type from us. Two // exceptions to this: // 1) If our parent type is table, we can't group columns with anything // else other than whitespace. // 2) Whitespace that lies between two things we can group which both want // a non-block parent should be dropped, even if we can't group them // with each other and even if the whitespace wants a parent of // ourParentType. Ends of the list count as things that don't want a // block parent (so that for example we'll drop a whitespace-only list). FCItemIterator endIter(iter); /* iterator to find the end of the group */ ParentType groupingParentType = endIter.item().DesiredParentType(); if (aItems.AllWantParentType(groupingParentType) && groupingParentType != eTypeBlock) { // Just group them all and be done with it. We need the check for // eTypeBlock here to catch the "all the items are whitespace" case // described above. endIter.SetToEnd(); } else { // Locate the end of the group. // Keep track of the type the previous item wanted, in case we have to // deal with whitespace. Start it off with ourParentType, since that's // the last thing |iter| would have skipped over. ParentType prevParentType = ourParentType; do { /* Walk an iterator past any whitespace that we might be able to drop from the list */ FCItemIterator spaceEndIter(endIter); if (prevParentType != eTypeBlock && !aParentFrame->IsGeneratedContentFrame() && spaceEndIter.item().IsWhitespace(aState)) { bool trailingSpaces = spaceEndIter.SkipWhitespace(aState); // We drop the whitespace if these are not trailing spaces and the next item // does not want a block parent (see case 2 above) // if these are trailing spaces and aParentFrame is a tabular container // according to rule 1.3 of CSS 2.1 Sec 17.2.1. (Being a tabular container // pretty much means ourParentType != eTypeBlock besides the eTypeColGroup case, // which won't reach here.) if ((trailingSpaces && ourParentType != eTypeBlock) || (!trailingSpaces && spaceEndIter.item().DesiredParentType() != eTypeBlock)) { bool updateStart = (iter == endIter); endIter.DeleteItemsTo(spaceEndIter); NS_ASSERTION(trailingSpaces == endIter.IsDone(), "These should match"); if (updateStart) { iter = endIter; } if (trailingSpaces) { break; /* Found group end */ } if (updateStart) { // Update groupingParentType, since it might have been eTypeBlock // just because of the whitespace. groupingParentType = iter.item().DesiredParentType(); } } } // Now endIter points to a non-whitespace item or a non-droppable // whitespace item. In the latter case, if this is the end of the group // we'll traverse this whitespace again. But it'll all just be quick // DesiredParentType() checks which will match ourParentType (that's // what it means that this is the group end), so it's OK. prevParentType = endIter.item().DesiredParentType(); if (prevParentType == ourParentType) { // End the group at endIter. break; } if (ourParentType == eTypeTable && (prevParentType == eTypeColGroup) != (groupingParentType == eTypeColGroup)) { // Either we started with columns and now found something else, or vice // versa. In any case, end the grouping. break; } // Include the whitespace we didn't drop (if any) in the group, since // this is not the end of the group. Note that this doesn't change // prevParentType, since if we didn't drop the whitespace then we ended // at something that wants a block parent. endIter = spaceEndIter; endIter.Next(); } while (!endIter.IsDone()); } if (iter == endIter) { // Nothing to wrap here; just skipped some whitespace continue; } // Now group together all the items between iter and endIter. The right // parent type to use depends on ourParentType. ParentType wrapperType; switch (ourParentType) { case eTypeBlock: wrapperType = eTypeTable; break; case eTypeRow: // The parent type for a cell is eTypeBlock, since that's what a cell // looks like to its kids. wrapperType = eTypeBlock; break; case eTypeRowGroup: wrapperType = eTypeRow; break; case eTypeTable: // Either colgroup or rowgroup, depending on what we're grouping. wrapperType = groupingParentType == eTypeColGroup ? eTypeColGroup : eTypeRowGroup; break; default: NS_NOTREACHED("Colgroups should be suppresing non-col child items"); break; } const PseudoParentData& pseudoData = sPseudoParentData[wrapperType]; nsIAtom* pseudoType = *pseudoData.mPseudoType; nsStyleContext* parentStyle = aParentFrame->GetStyleContext(); nsIContent* parentContent = aParentFrame->GetContent(); if (pseudoType == nsCSSAnonBoxes::table && parentStyle->GetStyleDisplay()->mDisplay == NS_STYLE_DISPLAY_INLINE) { pseudoType = nsCSSAnonBoxes::inlineTable; } nsRefPtr wrapperStyle = mPresShell->StyleSet()->ResolveAnonymousBoxStyle(pseudoType, parentStyle); FrameConstructionItem* newItem = new FrameConstructionItem(&pseudoData.mFCData, // Use the content of our parent frame parentContent, // Lie about the tag; it doesn't matter anyway pseudoType, // The namespace does matter, however; it needs // to match that of our first child item to // match the old behavior iter.item().mNameSpaceID, // no pending binding nullptr, wrapperStyle.forget(), true); // Here we're cheating a tad... technically, table-internal items should be // inline if aParentFrame is inline, but they'll get wrapped in an // inline-table in the end, so it'll all work out. In any case, arguably // we don't need to maintain this state at this point... but it's better // to, I guess. newItem->mIsAllInline = newItem->mHasInlineEnds = newItem->mStyleContext->GetStyleDisplay()->IsInlineOutsideStyle(); // Table pseudo frames always induce line boundaries around their // contents. newItem->mChildItems.SetLineBoundaryAtStart(true); newItem->mChildItems.SetLineBoundaryAtEnd(true); // The parent of the items in aItems is also the parent of the items // in mChildItems newItem->mChildItems.SetParentHasNoXBLChildren( aItems.ParentHasNoXBLChildren()); // Eat up all items between |iter| and |endIter| and put them in our wrapper // Advances |iter| to point to |endIter|. iter.AppendItemsToList(endIter, newItem->mChildItems); iter.InsertItem(newItem); // Now |iter| points to the item that was the first one we didn't wrap; // loop and see whether we need to skip it or wrap it in something // different. } while (!iter.IsDone()); } inline nsresult nsCSSFrameConstructor::ConstructFramesFromItemList(nsFrameConstructorState& aState, FrameConstructionItemList& aItems, nsIFrame* aParentFrame, nsFrameItems& aFrameItems) { aItems.SetTriedConstructingFrames(); CreateNeededTablePseudos(aState, aItems, aParentFrame); #ifdef MOZ_FLEXBOX if (aParentFrame->GetType() == nsGkAtoms::flexContainerFrame) { CreateNeededAnonFlexItems(aState, aItems, aParentFrame); } #endif // MOZ_FLEXBOX #ifdef DEBUG for (FCItemIterator iter(aItems); !iter.IsDone(); iter.Next()) { NS_ASSERTION(iter.item().DesiredParentType() == GetParentType(aParentFrame), "Needed pseudos didn't get created; expect bad things"); } #endif for (FCItemIterator iter(aItems); !iter.IsDone(); iter.Next()) { nsresult rv = ConstructFramesFromItem(aState, iter, aParentFrame, aFrameItems); NS_ENSURE_SUCCESS(rv, rv); } NS_ASSERTION(!aState.mHavePendingPopupgroup, "Should have proccessed it by now"); return NS_OK; } nsresult nsCSSFrameConstructor::ProcessChildren(nsFrameConstructorState& aState, nsIContent* aContent, nsStyleContext* aStyleContext, nsIFrame* aFrame, const bool aCanHaveGeneratedContent, nsFrameItems& aFrameItems, const bool aAllowBlockStyles, PendingBinding* aPendingBinding, nsIFrame* aPossiblyLeafFrame) { NS_PRECONDITION(aFrame, "Must have parent frame here"); NS_PRECONDITION(aFrame->GetContentInsertionFrame() == aFrame, "Parent frame in ProcessChildren should be its own " "content insertion frame"); if (!aPossiblyLeafFrame) { aPossiblyLeafFrame = aFrame; } // XXXbz ideally, this would do all the pushing of various // containing blocks as needed, so callers don't have to do it... bool haveFirstLetterStyle = false, haveFirstLineStyle = false; if (aAllowBlockStyles) { ShouldHaveSpecialBlockStyle(aContent, aStyleContext, &haveFirstLetterStyle, &haveFirstLineStyle); } // The logic here needs to match the logic in GetFloatContainingBlock() nsFrameConstructorSaveState floatSaveState; if (ShouldSuppressFloatingOfDescendants(aFrame)) { aState.PushFloatContainingBlock(nullptr, floatSaveState); } else if (aFrame->IsFloatContainingBlock()) { aState.PushFloatContainingBlock(aFrame, floatSaveState); } nsFrameConstructorState::PendingBindingAutoPusher pusher(aState, aPendingBinding); FrameConstructionItemList itemsToConstruct; nsresult rv = NS_OK; // If we have first-letter or first-line style then frames can get // moved around so don't set these flags. if (aAllowBlockStyles && !haveFirstLetterStyle && !haveFirstLineStyle) { itemsToConstruct.SetLineBoundaryAtStart(true); itemsToConstruct.SetLineBoundaryAtEnd(true); } // Create any anonymous frames we need here. This must happen before the // non-anonymous children are processed to ensure that popups are never // constructed before the popupset. nsAutoTArray anonymousItems; GetAnonymousContent(aContent, aPossiblyLeafFrame, anonymousItems); for (uint32_t i = 0; i < anonymousItems.Length(); ++i) { nsIContent* content = anonymousItems[i].mContent; #ifdef DEBUG nsIAnonymousContentCreator* creator = do_QueryFrame(aFrame); NS_ASSERTION(!creator || !creator->CreateFrameFor(content), "If you need to use CreateFrameFor, you need to call " "CreateAnonymousFrames manually and not follow the standard " "ProcessChildren() codepath for this frame"); #endif // Assert some things about this content NS_ABORT_IF_FALSE(!(content->GetFlags() & (NODE_DESCENDANTS_NEED_FRAMES | NODE_NEEDS_FRAME)), "Should not be marked as needing frames"); NS_ABORT_IF_FALSE(!content->IsElement() || !(content->GetFlags() & ELEMENT_ALL_RESTYLE_FLAGS), "Should have no pending restyle flags"); NS_ABORT_IF_FALSE(!content->GetPrimaryFrame(), "Should have no existing frame"); NS_ABORT_IF_FALSE(!content->IsNodeOfType(nsINode::eCOMMENT) && !content->IsNodeOfType(nsINode::ePROCESSING_INSTRUCTION), "Why is someone creating garbage anonymous content"); nsRefPtr styleContext; if (anonymousItems[i].mStyleContext) { styleContext = anonymousItems[i].mStyleContext.forget(); } else { styleContext = ResolveStyleContext(aFrame, content, &aState); } AddFrameConstructionItemsInternal(aState, content, aFrame, content->Tag(), content->GetNameSpaceID(), true, styleContext, ITEM_ALLOW_XBL_BASE | ITEM_ALLOW_PAGE_BREAK, itemsToConstruct); } if (!aPossiblyLeafFrame->IsLeaf()) { // :before/:after content should have the same style context parent // as normal kids. // Note that we don't use this style context for looking up things like // special block styles because in some cases involving table pseudo-frames // it has nothing to do with the parent frame's desired behavior. nsStyleContext* styleContext; if (aCanHaveGeneratedContent) { aFrame->AddStateBits(NS_FRAME_MAY_HAVE_GENERATED_CONTENT); styleContext = nsFrame::CorrectStyleParentFrame(aFrame, nullptr)->GetStyleContext(); // Probe for generated content before CreateGeneratedContentItem(aState, aFrame, aContent, styleContext, nsCSSPseudoElements::ePseudo_before, itemsToConstruct); } ChildIterator iter, last; for (ChildIterator::Init(aContent, &iter, &last); iter != last; ++iter) { nsIContent* child = *iter; // Frame construction item construction should not post // restyles, so removing restyle flags here is safe. if (child->IsElement()) { child->UnsetFlags(ELEMENT_ALL_RESTYLE_FLAGS); } AddFrameConstructionItems(aState, child, iter.XBLInvolved(), aFrame, itemsToConstruct); } itemsToConstruct.SetParentHasNoXBLChildren(!iter.XBLInvolved()); if (aCanHaveGeneratedContent) { // Probe for generated content after CreateGeneratedContentItem(aState, aFrame, aContent, styleContext, nsCSSPseudoElements::ePseudo_after, itemsToConstruct); } } else { ClearLazyBits(aContent->GetFirstChild(), nullptr); } rv = ConstructFramesFromItemList(aState, itemsToConstruct, aFrame, aFrameItems); NS_ENSURE_SUCCESS(rv, rv); NS_ASSERTION(!aAllowBlockStyles || !aFrame->IsBoxFrame(), "can't be both block and box"); if (haveFirstLetterStyle) { rv = WrapFramesInFirstLetterFrame(aContent, aFrame, aFrameItems); } if (haveFirstLineStyle) { rv = WrapFramesInFirstLineFrame(aState, aContent, aFrame, nullptr, aFrameItems); } // We might end up with first-line frames that change // AnyKidsNeedBlockParent() without changing itemsToConstruct, but that // should never happen for cases whan aFrame->IsBoxFrame(). NS_ASSERTION(!haveFirstLineStyle || !aFrame->IsBoxFrame(), "Shouldn't have first-line style if we're a box"); NS_ASSERTION(!aFrame->IsBoxFrame() || itemsToConstruct.AnyItemsNeedBlockParent() == (AnyKidsNeedBlockParent(aFrameItems.FirstChild()) != nullptr), "Something went awry in our block parent calculations"); if (aFrame->IsBoxFrame() && itemsToConstruct.AnyItemsNeedBlockParent()) { // XXXbz we could do this on the FrameConstructionItemList level, // no? And if we cared we could look through the item list // instead of groveling through the framelist here.. nsIContent *badKid = AnyKidsNeedBlockParent(aFrameItems.FirstChild()); nsDependentAtomString parentTag(aContent->Tag()), kidTag(badKid->Tag()); const PRUnichar* params[] = { parentTag.get(), kidTag.get() }; nsStyleContext *frameStyleContext = aFrame->GetStyleContext(); const nsStyleDisplay *display = frameStyleContext->GetStyleDisplay(); const char *message = (display->mDisplay == NS_STYLE_DISPLAY_INLINE_BOX) ? "NeededToWrapXULInlineBox" : "NeededToWrapXUL"; nsContentUtils::ReportToConsole(nsIScriptError::warningFlag, "FrameConstructor", mDocument, nsContentUtils::eXUL_PROPERTIES, message, params, ArrayLength(params)); nsRefPtr blockSC = mPresShell->StyleSet()-> ResolveAnonymousBoxStyle(nsCSSAnonBoxes::mozXULAnonymousBlock, frameStyleContext); nsIFrame *blockFrame = NS_NewBlockFrame(mPresShell, blockSC); // We might, in theory, want to set NS_BLOCK_FLOAT_MGR and // NS_BLOCK_MARGIN_ROOT, but I think it's a bad idea given that // a real block placed here wouldn't get those set on it. InitAndRestoreFrame(aState, aContent, aFrame, nullptr, blockFrame, false); NS_ASSERTION(!blockFrame->HasView(), "need to do view reparenting"); ReparentFrames(this, blockFrame, aFrameItems); blockFrame->SetInitialChildList(kPrincipalList, aFrameItems); NS_ASSERTION(aFrameItems.IsEmpty(), "How did that happen?"); aFrameItems.Clear(); aFrameItems.AddChild(blockFrame); aFrame->AddStateBits(NS_STATE_BOX_WRAPS_KIDS_IN_BLOCK); } return rv; } //---------------------------------------------------------------------- // Support for :first-line style // Special routine to handle placing a list of frames into a block // frame that has first-line style. The routine ensures that the first // collection of inline frames end up in a first-line frame. // NOTE: aState may have containing block information related to a // different part of the frame tree than where the first line occurs. // In particular aState may be set up for where ContentInserted or // ContentAppended is inserting content, which may be some // non-first-in-flow continuation of the block to which the first-line // belongs. So this function needs to be careful about how it uses // aState. nsresult nsCSSFrameConstructor::WrapFramesInFirstLineFrame( nsFrameConstructorState& aState, nsIContent* aBlockContent, nsIFrame* aBlockFrame, nsIFrame* aLineFrame, nsFrameItems& aFrameItems) { nsresult rv = NS_OK; // Find the part of aFrameItems that we want to put in the first-line nsFrameList::FrameLinkEnumerator link(aFrameItems); while (!link.AtEnd() && link.NextFrame()->IsInlineOutside()) { link.Next(); } nsFrameList firstLineChildren = aFrameItems.ExtractHead(link); if (firstLineChildren.IsEmpty()) { // Nothing is supposed to go into the first-line; nothing to do return NS_OK; } if (!aLineFrame) { // Create line frame nsStyleContext* parentStyle = nsFrame::CorrectStyleParentFrame(aBlockFrame, nsCSSPseudoElements::firstLine)-> GetStyleContext(); nsRefPtr firstLineStyle = GetFirstLineStyle(aBlockContent, parentStyle); aLineFrame = NS_NewFirstLineFrame(mPresShell, firstLineStyle); if (aLineFrame) { // Initialize the line frame rv = InitAndRestoreFrame(aState, aBlockContent, aBlockFrame, nullptr, aLineFrame); // The lineFrame will be the block's first child; the rest of the // frame list (after lastInlineFrame) will be the second and // subsequent children; insert lineFrame into aFrameItems. aFrameItems.InsertFrame(nullptr, nullptr, aLineFrame); NS_ASSERTION(aLineFrame->GetStyleContext() == firstLineStyle, "Bogus style context on line frame"); } } if (aLineFrame) { // Give the inline frames to the lineFrame after reparenting them ReparentFrames(this, aLineFrame, firstLineChildren); if (aLineFrame->PrincipalChildList().IsEmpty() && (aLineFrame->GetStateBits() & NS_FRAME_FIRST_REFLOW)) { aLineFrame->SetInitialChildList(kPrincipalList, firstLineChildren); } else { AppendFrames(aLineFrame, kPrincipalList, firstLineChildren); } } else { rv = NS_ERROR_OUT_OF_MEMORY; } return rv; } // Special routine to handle appending a new frame to a block frame's // child list. Takes care of placing the new frame into the right // place when first-line style is present. nsresult nsCSSFrameConstructor::AppendFirstLineFrames( nsFrameConstructorState& aState, nsIContent* aBlockContent, nsIFrame* aBlockFrame, nsFrameItems& aFrameItems) { // It's possible that aBlockFrame needs to have a first-line frame // created because it doesn't currently have any children. const nsFrameList& blockKids = aBlockFrame->PrincipalChildList(); if (blockKids.IsEmpty()) { return WrapFramesInFirstLineFrame(aState, aBlockContent, aBlockFrame, nullptr, aFrameItems); } // Examine the last block child - if it's a first-line frame then // appended frames need special treatment. nsIFrame* lastBlockKid = blockKids.LastChild(); if (lastBlockKid->GetType() != nsGkAtoms::lineFrame) { // No first-line frame at the end of the list, therefore there is // an intervening block between any first-line frame the frames // we are appending. Therefore, we don't need any special // treatment of the appended frames. return NS_OK; } return WrapFramesInFirstLineFrame(aState, aBlockContent, aBlockFrame, lastBlockKid, aFrameItems); } // Special routine to handle inserting a new frame into a block // frame's child list. Takes care of placing the new frame into the // right place when first-line style is present. nsresult nsCSSFrameConstructor::InsertFirstLineFrames( nsFrameConstructorState& aState, nsIContent* aContent, nsIFrame* aBlockFrame, nsIFrame** aParentFrame, nsIFrame* aPrevSibling, nsFrameItems& aFrameItems) { nsresult rv = NS_OK; // XXXbz If you make this method actually do something, check to // make sure that the caller is passing what you expect. In // particular, which content is aContent? And audit the rest of // this code too; it makes bogus assumptions and may not build. #if 0 nsIFrame* parentFrame = *aParentFrame; nsIFrame* newFrame = aFrameItems.childList; bool isInline = IsInlineOutside(newFrame); if (!aPrevSibling) { // Insertion will become the first frame. Two cases: we either // already have a first-line frame or we don't. nsIFrame* firstBlockKid = aBlockFrame->GetFirstPrincipalChild(); if (firstBlockKid->GetType() == nsGkAtoms::lineFrame) { // We already have a first-line frame nsIFrame* lineFrame = firstBlockKid; if (isInline) { // Easy case: the new inline frame will go into the lineFrame. ReparentFrame(this, lineFrame, newFrame); InsertFrames(lineFrame, kPrincipalList, nullptr, newFrame); // Since the frame is going into the lineFrame, don't let it // go into the block too. aFrameItems.childList = nullptr; aFrameItems.lastChild = nullptr; } else { // Harder case: We are about to insert a block level element // before the first-line frame. // XXX need a method to steal away frames from the line-frame } } else { // We do not have a first-line frame if (isInline) { // We now need a first-line frame to contain the inline frame. nsIFrame* lineFrame = NS_NewFirstLineFrame(firstLineStyle); if (!lineFrame) { rv = NS_ERROR_OUT_OF_MEMORY; } if (NS_SUCCEEDED(rv)) { // Lookup first-line style context nsStyleContext* parentStyle = nsFrame::CorrectStyleParentFrame(aBlockFrame, nsCSSPseudoElements::firstLine)-> GetStyleContext(); nsRefPtr firstLineStyle = GetFirstLineStyle(aContent, parentStyle); // Initialize the line frame rv = InitAndRestoreFrame(aState, aContent, aBlockFrame, nullptr, lineFrame); // Make sure the caller inserts the lineFrame into the // blocks list of children. aFrameItems.childList = lineFrame; aFrameItems.lastChild = lineFrame; // Give the inline frames to the lineFrame after // reparenting them NS_ASSERTION(lineFrame->GetStyleContext() == firstLineStyle, "Bogus style context on line frame"); ReparentFrame(aPresContext, lineFrame, newFrame); lineFrame->SetInitialChildList(kPrincipalList, newFrame); } } else { // Easy case: the regular insertion logic can insert the new // frame because it's a block frame. } } } else { // Insertion will not be the first frame. nsIFrame* prevSiblingParent = aPrevSibling->GetParent(); if (prevSiblingParent == aBlockFrame) { // Easy case: The prev-siblings parent is the block // frame. Therefore the prev-sibling is not currently in a // line-frame. Therefore the new frame which is going after it, // regardless of type, is not going into a line-frame. } else { // If the prevSiblingParent is not the block-frame then it must // be a line-frame (if it were a letter-frame, that logic would // already have adjusted the prev-sibling to be the // letter-frame). if (isInline) { // Easy case: the insertion can go where the caller thinks it // should go (which is into prevSiblingParent). } else { // Block elements don't end up in line-frames, therefore // change the insertion point to aBlockFrame. However, there // might be more inline elements following aPrevSibling that // need to be pulled out of the line-frame and become children // of the block. nsIFrame* nextSibling = aPrevSibling->GetNextSibling(); nsIFrame* nextLineFrame = prevSiblingParent->GetNextInFlow(); if (nextSibling || nextLineFrame) { // Oy. We have work to do. Create a list of the new frames // that are going into the block by stripping them away from // the line-frame(s). if (nextSibling) { nsLineFrame* lineFrame = (nsLineFrame*) prevSiblingParent; nsFrameList tail = lineFrame->StealFramesAfter(aPrevSibling); // XXX do something with 'tail' } nsLineFrame* nextLineFrame = (nsLineFrame*) lineFrame; for (;;) { nextLineFrame = nextLineFrame->GetNextInFlow(); if (!nextLineFrame) { break; } nsIFrame* kids = nextLineFrame->GetFirstPrincipalChild(); } } else { // We got lucky: aPrevSibling was the last inline frame in // the line-frame. ReparentFrame(this, aBlockFrame, newFrame); InsertFrames(aBlockFrame, kPrincipalList, prevSiblingParent, newFrame); aFrameItems.childList = nullptr; aFrameItems.lastChild = nullptr; } } } } #endif return rv; } //---------------------------------------------------------------------- // First-letter support // Determine how many characters in the text fragment apply to the // first letter static int32_t FirstLetterCount(const nsTextFragment* aFragment) { int32_t count = 0; int32_t firstLetterLength = 0; int32_t i, n = aFragment->GetLength(); for (i = 0; i < n; i++) { PRUnichar ch = aFragment->CharAt(i); if (XP_IS_SPACE(ch)) { if (firstLetterLength) { break; } count++; continue; } // XXX I18n if ((ch == '\'') || (ch == '\"')) { if (firstLetterLength) { break; } // keep looping firstLetterLength = 1; } else { count++; break; } } return count; } static bool NeedFirstLetterContinuation(nsIContent* aContent) { NS_PRECONDITION(aContent, "null ptr"); bool result = false; if (aContent) { const nsTextFragment* frag = aContent->GetText(); if (frag) { int32_t flc = FirstLetterCount(frag); int32_t tl = frag->GetLength(); if (flc < tl) { result = true; } } } return result; } static bool IsFirstLetterContent(nsIContent* aContent) { return aContent->TextLength() && !aContent->TextIsOnlyWhitespace(); } /** * Create a letter frame, only make it a floating frame. */ void nsCSSFrameConstructor::CreateFloatingLetterFrame( nsFrameConstructorState& aState, nsIFrame* aBlockFrame, nsIContent* aTextContent, nsIFrame* aTextFrame, nsIContent* aBlockContent, nsIFrame* aParentFrame, nsStyleContext* aStyleContext, nsFrameItems& aResult) { // Create the first-letter-frame nsresult rv; nsIFrame* letterFrame; nsStyleSet *styleSet = mPresShell->StyleSet(); letterFrame = NS_NewFirstLetterFrame(mPresShell, aStyleContext); // We don't want to use a text content for a non-text frame (because we want // its primary frame to be a text frame). So use its parent for the // first-letter. nsIContent* letterContent = aTextContent->GetParent(); nsIFrame* containingBlock = aState.GetGeometricParent( aStyleContext->GetStyleDisplay(), aParentFrame); InitAndRestoreFrame(aState, letterContent, containingBlock, nullptr, letterFrame); // Init the text frame to refer to the letter frame. Make sure we // get a proper style context for it (the one passed in is for the // letter frame and will have the float property set on it; the text // frame shouldn't have that set). nsRefPtr textSC; textSC = styleSet->ResolveStyleForNonElement(aStyleContext); aTextFrame->SetStyleContextWithoutNotification(textSC); InitAndRestoreFrame(aState, aTextContent, letterFrame, nullptr, aTextFrame); // And then give the text frame to the letter frame SetInitialSingleChild(letterFrame, aTextFrame); // See if we will need to continue the text frame (does it contain // more than just the first-letter text or not?) If it does, then we // create (in advance) a continuation frame for it. nsIFrame* nextTextFrame = nullptr; if (NeedFirstLetterContinuation(aTextContent)) { // Create continuation rv = CreateContinuingFrame(aState.mPresContext, aTextFrame, aParentFrame, &nextTextFrame); if (NS_FAILED(rv)) { letterFrame->Destroy(); return; } // Repair the continuations style context nsStyleContext* parentStyleContext = aStyleContext->GetParent(); if (parentStyleContext) { nsRefPtr newSC; newSC = styleSet->ResolveStyleForNonElement(parentStyleContext); if (newSC) { nextTextFrame->SetStyleContext(newSC); } } } NS_ASSERTION(aResult.IsEmpty(), "aResult should be an empty nsFrameItems!"); // Put the new float before any of the floats in the block we're doing // first-letter for, that is, before any floats whose parent is // containingBlock. nsFrameList::FrameLinkEnumerator link(aState.mFloatedItems); while (!link.AtEnd() && link.NextFrame()->GetParent() != containingBlock) { link.Next(); } rv = aState.AddChild(letterFrame, aResult, letterContent, aStyleContext, aParentFrame, false, true, false, true, link.PrevFrame()); if (nextTextFrame) { if (NS_FAILED(rv)) { nextTextFrame->Destroy(); } else { aResult.AddChild(nextTextFrame); } } } /** * Create a new letter frame for aTextFrame. The letter frame will be * a child of aParentFrame. */ nsresult nsCSSFrameConstructor::CreateLetterFrame(nsIFrame* aBlockFrame, nsIFrame* aBlockContinuation, nsIContent* aTextContent, nsIFrame* aParentFrame, nsFrameItems& aResult) { NS_PRECONDITION(aTextContent->IsNodeOfType(nsINode::eTEXT), "aTextContent isn't text"); NS_ASSERTION(nsLayoutUtils::GetAsBlock(aBlockFrame), "Not a block frame?"); // Get style context for the first-letter-frame nsStyleContext* parentStyleContext = nsFrame::CorrectStyleParentFrame(aParentFrame, nsCSSPseudoElements::firstLetter)-> GetStyleContext(); // Use content from containing block so that we can actually // find a matching style rule. nsIContent* blockContent = aBlockFrame->GetContent(); // Create first-letter style rule nsRefPtr sc = GetFirstLetterStyle(blockContent, parentStyleContext); if (sc) { nsRefPtr textSC; textSC = mPresShell->StyleSet()->ResolveStyleForNonElement(sc); // Create a new text frame (the original one will be discarded) // pass a temporary stylecontext, the correct one will be set // later. Start off by unsetting the primary frame for // aTextContent, so it's no longer pointing to the to-be-destroyed // frame. // XXXbz it would be really nice to destroy the old frame _first_, // then create the new one, so we could avoid this hack. aTextContent->SetPrimaryFrame(nullptr); nsIFrame* textFrame = NS_NewTextFrame(mPresShell, textSC); NS_ASSERTION(aBlockContinuation == GetFloatContainingBlock(aParentFrame), "Containing block is confused"); nsFrameConstructorState state(mPresShell, mFixedContainingBlock, GetAbsoluteContainingBlock(aParentFrame), aBlockContinuation); // Create the right type of first-letter frame const nsStyleDisplay* display = sc->GetStyleDisplay(); if (display->IsFloating(aParentFrame)) { // Make a floating first-letter frame CreateFloatingLetterFrame(state, aBlockFrame, aTextContent, textFrame, blockContent, aParentFrame, sc, aResult); } else { // Make an inflow first-letter frame nsIFrame* letterFrame = NS_NewFirstLetterFrame(mPresShell, sc); if (letterFrame) { // Initialize the first-letter-frame. We don't want to use a text // content for a non-text frame (because we want its primary frame to // be a text frame). So use its parent for the first-letter. nsIContent* letterContent = aTextContent->GetParent(); letterFrame->Init(letterContent, aParentFrame, nullptr); InitAndRestoreFrame(state, aTextContent, letterFrame, nullptr, textFrame); SetInitialSingleChild(letterFrame, textFrame); aResult.Clear(); aResult.AddChild(letterFrame); NS_ASSERTION(!aBlockFrame->GetPrevContinuation(), "should have the first continuation here"); aBlockFrame->AddStateBits(NS_BLOCK_HAS_FIRST_LETTER_CHILD); } } aTextContent->SetPrimaryFrame(textFrame); } return NS_OK; } nsresult nsCSSFrameConstructor::WrapFramesInFirstLetterFrame( nsIContent* aBlockContent, nsIFrame* aBlockFrame, nsFrameItems& aBlockFrames) { nsresult rv = NS_OK; aBlockFrame->AddStateBits(NS_BLOCK_HAS_FIRST_LETTER_STYLE); nsIFrame* parentFrame = nullptr; nsIFrame* textFrame = nullptr; nsIFrame* prevFrame = nullptr; nsFrameItems letterFrames; bool stopLooking = false; rv = WrapFramesInFirstLetterFrame(aBlockFrame, aBlockFrame, aBlockFrame, aBlockFrames.FirstChild(), &parentFrame, &textFrame, &prevFrame, letterFrames, &stopLooking); if (NS_FAILED(rv)) { return rv; } if (parentFrame) { if (parentFrame == aBlockFrame) { // Take textFrame out of the block's frame list and substitute the // letter frame(s) instead. aBlockFrames.DestroyFrame(textFrame); aBlockFrames.InsertFrames(nullptr, prevFrame, letterFrames); } else { // Take the old textFrame out of the inline parent's child list RemoveFrame(kPrincipalList, textFrame); // Insert in the letter frame(s) parentFrame->InsertFrames(kPrincipalList, prevFrame, letterFrames); } } return rv; } nsresult nsCSSFrameConstructor::WrapFramesInFirstLetterFrame( nsIFrame* aBlockFrame, nsIFrame* aBlockContinuation, nsIFrame* aParentFrame, nsIFrame* aParentFrameList, nsIFrame** aModifiedParent, nsIFrame** aTextFrame, nsIFrame** aPrevFrame, nsFrameItems& aLetterFrames, bool* aStopLooking) { nsresult rv = NS_OK; nsIFrame* prevFrame = nullptr; nsIFrame* frame = aParentFrameList; while (frame) { nsIFrame* nextFrame = frame->GetNextSibling(); nsIAtom* frameType = frame->GetType(); if (nsGkAtoms::textFrame == frameType) { // Wrap up first-letter content in a letter frame nsIContent* textContent = frame->GetContent(); if (IsFirstLetterContent(textContent)) { // Create letter frame to wrap up the text rv = CreateLetterFrame(aBlockFrame, aBlockContinuation, textContent, aParentFrame, aLetterFrames); if (NS_FAILED(rv)) { return rv; } // Provide adjustment information for parent *aModifiedParent = aParentFrame; *aTextFrame = frame; *aPrevFrame = prevFrame; *aStopLooking = true; return NS_OK; } } else if (IsInlineFrame(frame) && frameType != nsGkAtoms::brFrame) { nsIFrame* kids = frame->GetFirstPrincipalChild(); WrapFramesInFirstLetterFrame(aBlockFrame, aBlockContinuation, frame, kids, aModifiedParent, aTextFrame, aPrevFrame, aLetterFrames, aStopLooking); if (*aStopLooking) { return NS_OK; } } else { // This will stop us looking to create more letter frames. For // example, maybe the frame-type is "letterFrame" or // "placeholderFrame". This keeps us from creating extra letter // frames, and also prevents us from creating letter frames when // the first real content child of a block is not text (e.g. an // image, hr, etc.) *aStopLooking = true; break; } prevFrame = frame; frame = nextFrame; } return rv; } nsresult nsCSSFrameConstructor::RemoveFloatingFirstLetterFrames( nsPresContext* aPresContext, nsIPresShell* aPresShell, nsIFrame* aBlockFrame, bool* aStopLooking) { // First look for the float frame that is a letter frame nsIFrame* floatFrame = aBlockFrame->GetFirstChild(nsIFrame::kFloatList); while (floatFrame) { // See if we found a floating letter frame if (nsGkAtoms::letterFrame == floatFrame->GetType()) { break; } floatFrame = floatFrame->GetNextSibling(); } if (!floatFrame) { // No such frame return NS_OK; } // Take the text frame away from the letter frame (so it isn't // destroyed when we destroy the letter frame). nsIFrame* textFrame = floatFrame->GetFirstPrincipalChild(); if (!textFrame) { return NS_OK; } // Discover the placeholder frame for the letter frame nsIFrame* parentFrame; nsPlaceholderFrame* placeholderFrame = GetPlaceholderFrameFor(floatFrame); if (!placeholderFrame) { // Somethings really wrong return NS_OK; } parentFrame = placeholderFrame->GetParent(); if (!parentFrame) { // Somethings really wrong return NS_OK; } // Create a new text frame with the right style context that maps // all of the content that was previously part of the letter frame // (and probably continued elsewhere). nsStyleContext* parentSC = parentFrame->GetStyleContext(); if (!parentSC) { return NS_OK; } nsIContent* textContent = textFrame->GetContent(); if (!textContent) { return NS_OK; } nsRefPtr newSC; newSC = aPresShell->StyleSet()->ResolveStyleForNonElement(parentSC); if (!newSC) { return NS_OK; } nsIFrame* newTextFrame = NS_NewTextFrame(aPresShell, newSC); if (NS_UNLIKELY(!newTextFrame)) { return NS_ERROR_OUT_OF_MEMORY;; } newTextFrame->Init(textContent, parentFrame, nullptr); // Destroy the old text frame's continuations (the old text frame // will be destroyed when its letter frame is destroyed). nsIFrame* frameToDelete = textFrame->GetLastContinuation(); while (frameToDelete != textFrame) { nsIFrame* nextFrameToDelete = frameToDelete->GetPrevContinuation(); RemoveFrame(kPrincipalList, frameToDelete); frameToDelete = nextFrameToDelete; } nsIFrame* prevSibling = placeholderFrame->GetPrevSibling(); // Now that everything is set... #ifdef NOISY_FIRST_LETTER printf("RemoveFloatingFirstLetterFrames: textContent=%p oldTextFrame=%p newTextFrame=%p\n", textContent.get(), textFrame, newTextFrame); #endif // Remove placeholder frame and the float RemoveFrame(kPrincipalList, placeholderFrame); // Now that the old frames are gone, we can start pointing to our // new primary frame. textContent->SetPrimaryFrame(newTextFrame); // Insert text frame in its place nsFrameList textList(newTextFrame, newTextFrame); InsertFrames(parentFrame, kPrincipalList, prevSibling, textList); return NS_OK; } nsresult nsCSSFrameConstructor::RemoveFirstLetterFrames(nsPresContext* aPresContext, nsIPresShell* aPresShell, nsIFrame* aFrame, nsIFrame* aBlockFrame, bool* aStopLooking) { nsIFrame* prevSibling = nullptr; nsIFrame* kid = aFrame->GetFirstPrincipalChild(); while (kid) { if (nsGkAtoms::letterFrame == kid->GetType()) { // Bingo. Found it. First steal away the text frame. nsIFrame* textFrame = kid->GetFirstPrincipalChild(); if (!textFrame) { break; } // Create a new textframe nsStyleContext* parentSC = aFrame->GetStyleContext(); if (!parentSC) { break; } nsIContent* textContent = textFrame->GetContent(); if (!textContent) { break; } nsRefPtr newSC; newSC = aPresShell->StyleSet()->ResolveStyleForNonElement(parentSC); if (!newSC) { break; } textFrame = NS_NewTextFrame(aPresShell, newSC); textFrame->Init(textContent, aFrame, nullptr); // Next rip out the kid and replace it with the text frame RemoveFrame(kPrincipalList, kid); // Now that the old frames are gone, we can start pointing to our // new primary frame. textContent->SetPrimaryFrame(textFrame); // Insert text frame in its place nsFrameList textList(textFrame, textFrame); InsertFrames(aFrame, kPrincipalList, prevSibling, textList); *aStopLooking = true; NS_ASSERTION(!aBlockFrame->GetPrevContinuation(), "should have the first continuation here"); aBlockFrame->RemoveStateBits(NS_BLOCK_HAS_FIRST_LETTER_CHILD); break; } else if (IsInlineFrame(kid)) { // Look inside child inline frame for the letter frame RemoveFirstLetterFrames(aPresContext, aPresShell, kid, aBlockFrame, aStopLooking); if (*aStopLooking) { break; } } prevSibling = kid; kid = kid->GetNextSibling(); } return NS_OK; } nsresult nsCSSFrameConstructor::RemoveLetterFrames(nsPresContext* aPresContext, nsIPresShell* aPresShell, nsIFrame* aBlockFrame) { aBlockFrame = aBlockFrame->GetFirstContinuation(); nsIFrame* continuation = aBlockFrame; bool stopLooking = false; nsresult rv; do { rv = RemoveFloatingFirstLetterFrames(aPresContext, aPresShell, continuation, &stopLooking); if (NS_SUCCEEDED(rv) && !stopLooking) { rv = RemoveFirstLetterFrames(aPresContext, aPresShell, continuation, aBlockFrame, &stopLooking); } if (stopLooking) { break; } continuation = continuation->GetNextContinuation(); } while (continuation); return rv; } // Fixup the letter frame situation for the given block nsresult nsCSSFrameConstructor::RecoverLetterFrames(nsIFrame* aBlockFrame) { aBlockFrame = aBlockFrame->GetFirstContinuation(); nsIFrame* continuation = aBlockFrame; nsIFrame* parentFrame = nullptr; nsIFrame* textFrame = nullptr; nsIFrame* prevFrame = nullptr; nsFrameItems letterFrames; bool stopLooking = false; nsresult rv; do { // XXX shouldn't this bit be set already (bug 408493), assert instead? continuation->AddStateBits(NS_BLOCK_HAS_FIRST_LETTER_STYLE); rv = WrapFramesInFirstLetterFrame(aBlockFrame, continuation, continuation, continuation->GetFirstPrincipalChild(), &parentFrame, &textFrame, &prevFrame, letterFrames, &stopLooking); if (NS_FAILED(rv)) { return rv; } if (stopLooking) { break; } continuation = continuation->GetNextContinuation(); } while (continuation); if (parentFrame) { // Take the old textFrame out of the parents child list RemoveFrame(kPrincipalList, textFrame); // Insert in the letter frame(s) parentFrame->InsertFrames(kPrincipalList, prevFrame, letterFrames); } return rv; } //---------------------------------------------------------------------- // listbox Widget Routines nsresult nsCSSFrameConstructor::CreateListBoxContent(nsPresContext* aPresContext, nsIFrame* aParentFrame, nsIFrame* aPrevFrame, nsIContent* aChild, nsIFrame** aNewFrame, bool aIsAppend, bool aIsScrollbar, nsILayoutHistoryState* aFrameState) { #ifdef MOZ_XUL nsresult rv = NS_OK; // Construct a new frame if (nullptr != aParentFrame) { nsFrameItems frameItems; nsFrameConstructorState state(mPresShell, mFixedContainingBlock, GetAbsoluteContainingBlock(aParentFrame), GetFloatContainingBlock(aParentFrame), mTempFrameTreeState); // If we ever initialize the ancestor filter on |state|, make sure // to push the right parent! nsRefPtr styleContext; styleContext = ResolveStyleContext(aParentFrame, aChild, &state); // Pre-check for display "none" - only if we find that, do we create // any frame at all const nsStyleDisplay* display = styleContext->GetStyleDisplay(); if (NS_STYLE_DISPLAY_NONE == display->mDisplay) { *aNewFrame = nullptr; return NS_OK; } BeginUpdate(); FrameConstructionItemList items; AddFrameConstructionItemsInternal(state, aChild, aParentFrame, aChild->Tag(), aChild->GetNameSpaceID(), true, styleContext, ITEM_ALLOW_XBL_BASE, items); ConstructFramesFromItemList(state, items, aParentFrame, frameItems); nsIFrame* newFrame = frameItems.FirstChild(); *aNewFrame = newFrame; if (newFrame) { // Notify the parent frame if (aIsAppend) rv = ((nsListBoxBodyFrame*)aParentFrame)->ListBoxAppendFrames(frameItems); else rv = ((nsListBoxBodyFrame*)aParentFrame)->ListBoxInsertFrames(aPrevFrame, frameItems); } EndUpdate(); #ifdef ACCESSIBILITY if (newFrame) { nsAccessibilityService* accService = nsIPresShell::AccService(); if (accService) { accService->ContentRangeInserted(mPresShell, aChild->GetParent(), aChild, aChild->GetNextSibling()); } } #endif } return rv; #else return NS_ERROR_FAILURE; #endif } //---------------------------------------- nsresult nsCSSFrameConstructor::ConstructBlock(nsFrameConstructorState& aState, const nsStyleDisplay* aDisplay, nsIContent* aContent, nsIFrame* aParentFrame, nsIFrame* aContentParentFrame, nsStyleContext* aStyleContext, nsIFrame** aNewFrame, nsFrameItems& aFrameItems, bool aAbsPosContainer, PendingBinding* aPendingBinding) { // Create column wrapper if necessary nsIFrame* blockFrame = *aNewFrame; NS_ASSERTION(blockFrame->GetType() == nsGkAtoms::blockFrame, "not a block frame?"); nsIFrame* parent = aParentFrame; nsRefPtr blockStyle = aStyleContext; const nsStyleColumn* columns = aStyleContext->GetStyleColumn(); if (columns->mColumnCount != NS_STYLE_COLUMN_COUNT_AUTO || columns->mColumnWidth.GetUnit() != eStyleUnit_Auto) { nsIFrame* columnSetFrame = nullptr; columnSetFrame = NS_NewColumnSetFrame(mPresShell, aStyleContext, 0); if (!columnSetFrame) { return NS_ERROR_OUT_OF_MEMORY; } InitAndRestoreFrame(aState, aContent, aParentFrame, nullptr, columnSetFrame); blockStyle = mPresShell->StyleSet()-> ResolveAnonymousBoxStyle(nsCSSAnonBoxes::columnContent, aStyleContext); parent = columnSetFrame; *aNewFrame = columnSetFrame; SetInitialSingleChild(columnSetFrame, blockFrame); } blockFrame->SetStyleContextWithoutNotification(blockStyle); InitAndRestoreFrame(aState, aContent, parent, nullptr, blockFrame); nsresult rv = aState.AddChild(*aNewFrame, aFrameItems, aContent, aStyleContext, aContentParentFrame ? aContentParentFrame : aParentFrame); if (NS_FAILED(rv)) { return rv; } if (!mRootElementFrame) { // The frame we're constructing will be the root element frame. // Set mRootElementFrame before processing children. mRootElementFrame = *aNewFrame; } // We should make the outer frame be the absolute containing block, // if one is required. We have to do this because absolute // positioning must be computed with respect to the CSS dimensions // of the element, which are the dimensions of the outer block. But // we can't really do that because only blocks can have absolute // children. So use the block and try to compensate with hacks // in nsBlockFrame::CalculateContainingBlockSizeForAbsolutes. nsFrameConstructorSaveState absoluteSaveState; if (aAbsPosContainer) { // NS_ASSERTION(aRelPos, "should have made area frame for this"); aState.PushAbsoluteContainingBlock(*aNewFrame, absoluteSaveState); } // Process the child content nsFrameItems childItems; rv = ProcessChildren(aState, aContent, aStyleContext, blockFrame, true, childItems, true, aPendingBinding); // Set the frame's initial child list blockFrame->SetInitialChildList(kPrincipalList, childItems); return rv; } nsresult nsCSSFrameConstructor::ConstructInline(nsFrameConstructorState& aState, FrameConstructionItem& aItem, nsIFrame* aParentFrame, const nsStyleDisplay* aDisplay, nsFrameItems& aFrameItems, nsIFrame** aNewFrame) { // If an inline frame has non-inline kids, then we chop up the child list // into runs of blocks and runs of inlines, create anonymous block frames to // contain the runs of blocks, inline frames with our style context for the // runs of inlines, and put all these frames, in order, into aFrameItems. We // put the first one into *aNewFrame. The whole setup is called an {ib} // split; in what follows "frames in the split" refers to the anonymous blocks // and inlines that contain our children. // // {ib} splits maintain the following invariants: // 1) All frames in the split have the NS_FRAME_IS_SPECIAL bit set. // 2) Each frame in the split has the nsIFrame::IBSplitSpecialSibling // property pointing to the next frame in the split, except for the last // one, which does not have it set. // 3) Each frame in the split has the nsIFrame::IBSplitSpecialPrevSibling // property pointing to the previous frame in the split, except for the // first one, which does not have it set. // 4) The first and last frame in the split are always inlines. // // An invariant that is NOT maintained is that the wrappers are actually // linked via GetNextSibling linkage. A simple example is an inline // containing an inline that contains a block. The three parts of the inner // inline end up with three different parents. // // For example, this HTML: // //
a
// // b //
c
// // d //
e
// f // // Gives the following frame tree: // // Inline (outer span) // Block (anonymous, outer span) // Block (div) // Text("a") // Inline (outer span) // Inline (inner span) // Text("b") // Block (anonymous, outer span) // Block (anonymous, inner span) // Block (div) // Text("c") // Inline (outer span) // Inline (inner span) // Text("d") // Block (anonymous, outer span) // Block (div) // Text("e") // Inline (outer span) // Text("f") nsIContent* const content = aItem.mContent; nsStyleContext* const styleContext = aItem.mStyleContext; bool positioned = NS_STYLE_DISPLAY_INLINE == aDisplay->mDisplay && (NS_STYLE_POSITION_RELATIVE == aDisplay->mPosition || aDisplay->HasTransform()) && !aParentFrame->IsSVGText(); nsIFrame* newFrame = NS_NewInlineFrame(mPresShell, styleContext); if (!newFrame) { return NS_ERROR_OUT_OF_MEMORY; } // Initialize the frame InitAndRestoreFrame(aState, content, aParentFrame, nullptr, newFrame); // Inline frames can always have generated content newFrame->AddStateBits(NS_FRAME_MAY_HAVE_GENERATED_CONTENT); nsFrameConstructorSaveState absoluteSaveState; // definition cannot be inside next block // because the object's destructor is significant // this is part of the fix for bug 42372 if (positioned) { // Relatively positioned frames becomes a container for child // frames that are positioned aState.PushAbsoluteContainingBlock(newFrame, absoluteSaveState); } // Process the child content nsFrameItems childItems; nsresult rv = ConstructFramesFromItemList(aState, aItem.mChildItems, newFrame, childItems); if (NS_FAILED(rv)) { // Clean up. // Link up any successfully-created child frames here, so that we'll // clean them up as well. newFrame->SetInitialChildList(kPrincipalList, childItems); newFrame->Destroy(); return rv; } nsFrameList::FrameLinkEnumerator firstBlockEnumerator(childItems); if (!aItem.mIsAllInline) { FindFirstBlock(firstBlockEnumerator); } if (aItem.mIsAllInline || firstBlockEnumerator.AtEnd()) { // This part is easy. We either already know we have no non-inline kids, // or haven't found any when constructing actual frames (the latter can // happen only if out-of-flows that we thought had no containing block // acquired one when ancestor inline frames and {ib} splits got // constructed). Just put all the kids into the single inline frame and // bail. newFrame->SetInitialChildList(kPrincipalList, childItems); if (NS_SUCCEEDED(rv)) { aState.AddChild(newFrame, aFrameItems, content, styleContext, aParentFrame); *aNewFrame = newFrame; } return rv; } // This inline frame contains several types of children. Therefore this frame // has to be chopped into several pieces, as described above. // Grab the first inline's kids nsFrameList firstInlineKids = childItems.ExtractHead(firstBlockEnumerator); newFrame->SetInitialChildList(kPrincipalList, firstInlineKids); aFrameItems.AddChild(newFrame); CreateIBSiblings(aState, newFrame, positioned, childItems, aFrameItems); *aNewFrame = newFrame; return NS_OK; } void nsCSSFrameConstructor::CreateIBSiblings(nsFrameConstructorState& aState, nsIFrame* aInitialInline, bool aIsPositioned, nsFrameItems& aChildItems, nsFrameItems& aSiblings) { nsIContent* content = aInitialInline->GetContent(); nsStyleContext* styleContext = aInitialInline->GetStyleContext(); nsIFrame* parentFrame = aInitialInline->GetParent(); // Resolve the right style context for our anonymous blocks. // The distinction in styles is needed because of CSS 2.1, section // 9.2.1.1, which says: // When such an inline box is affected by relative positioning, any // resulting translation also affects the block-level box contained // in the inline box. nsRefPtr blockSC = mPresShell->StyleSet()-> ResolveAnonymousBoxStyle(aIsPositioned ? nsCSSAnonBoxes::mozAnonymousPositionedBlock : nsCSSAnonBoxes::mozAnonymousBlock, styleContext); nsIFrame* lastNewInline = aInitialInline->GetFirstContinuation(); do { // On entry to this loop aChildItems is not empty and the first frame in it // is block-level. NS_PRECONDITION(aChildItems.NotEmpty(), "Should have child items"); NS_PRECONDITION(!aChildItems.FirstChild()->IsInlineOutside(), "Must have list starting with block"); // The initial run of blocks belongs to an anonymous block that we create // right now. The anonymous block will be the parent of these block // children of the inline. nsIFrame* blockFrame; blockFrame = NS_NewBlockFrame(mPresShell, blockSC); InitAndRestoreFrame(aState, content, parentFrame, nullptr, blockFrame, false); // Find the first non-block child which defines the end of our block kids // and the start of our next inline's kids nsFrameList::FrameLinkEnumerator firstNonBlock = FindFirstNonBlock(aChildItems); nsFrameList blockKids = aChildItems.ExtractHead(firstNonBlock); MoveChildrenTo(aState.mPresContext, aInitialInline, blockFrame, blockKids); SetFrameIsSpecial(lastNewInline, blockFrame); aSiblings.AddChild(blockFrame); // Now grab the initial inlines in aChildItems and put them into an inline // frame nsIFrame* inlineFrame = NS_NewInlineFrame(mPresShell, styleContext); InitAndRestoreFrame(aState, content, parentFrame, nullptr, inlineFrame, false); inlineFrame->AddStateBits(NS_FRAME_MAY_HAVE_GENERATED_CONTENT); if (aIsPositioned) { inlineFrame->MarkAsAbsoluteContainingBlock(); } if (aChildItems.NotEmpty()) { nsFrameList::FrameLinkEnumerator firstBlock(aChildItems); FindFirstBlock(firstBlock); nsFrameList inlineKids = aChildItems.ExtractHead(firstBlock); MoveChildrenTo(aState.mPresContext, aInitialInline, inlineFrame, inlineKids); } SetFrameIsSpecial(blockFrame, inlineFrame); aSiblings.AddChild(inlineFrame); lastNewInline = inlineFrame; } while (aChildItems.NotEmpty()); SetFrameIsSpecial(lastNewInline, nullptr); } void nsCSSFrameConstructor::BuildInlineChildItems(nsFrameConstructorState& aState, FrameConstructionItem& aParentItem) { // XXXbz should we preallocate aParentItem.mChildItems to some sane // length? Maybe even to parentContent->GetChildCount()? nsFrameConstructorState::PendingBindingAutoPusher pusher(aState, aParentItem.mPendingBinding); // Probe for generated content before nsStyleContext* const parentStyleContext = aParentItem.mStyleContext; nsIContent* const parentContent = aParentItem.mContent; AncestorFilter::AutoAncestorPusher ancestorPusher(aState.mTreeMatchContext.mAncestorFilter.HasFilter(), aState.mTreeMatchContext.mAncestorFilter, parentContent->AsElement()); CreateGeneratedContentItem(aState, nullptr, parentContent, parentStyleContext, nsCSSPseudoElements::ePseudo_before, aParentItem.mChildItems); ChildIterator iter, last; for (ChildIterator::Init(parentContent, &iter, &last); iter != last; ++iter) { // Manually check for comments/PIs, since we don't have a frame to pass to // AddFrameConstructionItems. We know our parent is a non-replaced inline, // so there is no need to do the NeedFrameFor check. nsIContent* content = *iter; content->UnsetFlags(NODE_DESCENDANTS_NEED_FRAMES | NODE_NEEDS_FRAME); if (content->IsNodeOfType(nsINode::eCOMMENT) || content->IsNodeOfType(nsINode::ePROCESSING_INSTRUCTION)) { continue; } if (content->IsElement()) { // See comment explaining why we need to remove the "is possible // restyle root" flags in AddFrameConstructionItems. But note // that we can remove all restyle flags, just like in // ProcessChildren and for the same reason. content->UnsetFlags(ELEMENT_ALL_RESTYLE_FLAGS); } nsRefPtr childContext = ResolveStyleContext(parentStyleContext, content, &aState); AddFrameConstructionItemsInternal(aState, content, nullptr, content->Tag(), content->GetNameSpaceID(), iter.XBLInvolved(), childContext, ITEM_ALLOW_XBL_BASE | ITEM_ALLOW_PAGE_BREAK, aParentItem.mChildItems); } // Probe for generated content after CreateGeneratedContentItem(aState, nullptr, parentContent, parentStyleContext, nsCSSPseudoElements::ePseudo_after, aParentItem.mChildItems); aParentItem.mIsAllInline = aParentItem.mChildItems.AreAllItemsInline(); } // return whether it's ok to append (in the AppendFrames sense) to // aParentFrame if our nextSibling is aNextSibling. aParentFrame must // be an {ib} special inline. static bool IsSafeToAppendToSpecialInline(nsIFrame* aParentFrame, nsIFrame* aNextSibling) { NS_PRECONDITION(IsInlineFrame(aParentFrame), "Must have an inline parent here"); do { NS_ASSERTION(IsFrameSpecial(aParentFrame), "How is this not special?"); if (aNextSibling || aParentFrame->GetNextContinuation() || GetSpecialSibling(aParentFrame)) { return false; } aNextSibling = aParentFrame->GetNextSibling(); aParentFrame = aParentFrame->GetParent(); } while (IsInlineFrame(aParentFrame)); return true; } bool nsCSSFrameConstructor::WipeContainingBlock(nsFrameConstructorState& aState, nsIFrame* aContainingBlock, nsIFrame* aFrame, FrameConstructionItemList& aItems, bool aIsAppend, nsIFrame* aPrevSibling) { if (aItems.IsEmpty()) { return false; } // Before we go and append the frames, we must check for several // special situations. // Situation #1 is a XUL frame that contains frames that are required // to be wrapped in blocks. if (aFrame->IsBoxFrame() && !(aFrame->GetStateBits() & NS_STATE_BOX_WRAPS_KIDS_IN_BLOCK) && aItems.AnyItemsNeedBlockParent()) { RecreateFramesForContent(aFrame->GetContent(), true); return true; } nsIFrame* nextSibling = ::GetInsertNextSibling(aFrame, aPrevSibling); #ifdef MOZ_FLEXBOX // Situation #2 is a flex container frame into which we're inserting new // inline non-replaced children, adjacent to an existing anonymous flex item. if (aFrame->GetType() == nsGkAtoms::flexContainerFrame) { FCItemIterator iter(aItems); // Check if we're adding to-be-wrapped content right *after* an existing // anonymous flex item (which would need to absorb this content). if (aPrevSibling && IsAnonymousFlexItem(aPrevSibling) && iter.item().NeedsAnonFlexItem(aState)) { RecreateFramesForContent(aFrame->GetContent(), true); return true; } // Check if we're adding to-be-wrapped content right *before* an existing // anonymous flex item (which would need to absorb this content). if (nextSibling && IsAnonymousFlexItem(nextSibling)) { // Jump to the last entry in the list iter.SetToEnd(); iter.Prev(); if (iter.item().NeedsAnonFlexItem(aState)) { RecreateFramesForContent(aFrame->GetContent(), true); return true; } } } // Situation #3 is an anonymous flex item that's getting new children who // don't want to be wrapped. if (IsAnonymousFlexItem(aFrame)) { nsIFrame* flexContainerFrame = aFrame->GetParent(); NS_ABORT_IF_FALSE(flexContainerFrame && flexContainerFrame->GetType() == nsGkAtoms::flexContainerFrame, "anonymous flex items should only exist as children " "of flex container frames"); // We need to push a null float containing block to be sure that // "NeedsAnonFlexItem" will know we're not honoring floats for this // inserted content. (In particular, this is necessary in order for // NeedsAnonFlexItem's "GetGeometricParent" call to return the correct // result.) We're not honoring floats on this content because it has the // _flex container_ as its parent in the content tree. nsFrameConstructorSaveState floatSaveState; aState.PushFloatContainingBlock(nullptr, floatSaveState); FCItemIterator iter(aItems); // Skip over things that _do_ need an anonymous flex item, because // they're perfectly happy to go here -- they won't cause a reframe. if (!iter.SkipItemsThatNeedAnonFlexItem(aState)) { // We hit something that _doesn't_ need an anonymous flex item! // Rebuild the flex container to bust it out. RecreateFramesForContent(flexContainerFrame->GetContent(), true); return true; } // If we get here, then everything in |aItems| needs to be wrapped in // an anonymous flex item. That's where it's already going - good! } #endif // MOZ_FLEXBOX // Situation #4 is a case when table pseudo-frames don't work out right ParentType parentType = GetParentType(aFrame); // If all the kids want a parent of the type that aFrame is, then we're all // set to go. Indeed, there won't be any table pseudo-frames created between // aFrame and the kids, so those won't need to be merged with any table // pseudo-frames that might already be kids of aFrame. If aFrame itself is a // table pseudo-frame, then all the kids in this list would have wanted a // frame of that type wrapping them anyway, so putting them inside it is ok. if (!aItems.AllWantParentType(parentType)) { // Don't give up yet. If parentType is not eTypeBlock and the parent is // not a generated content frame, then try filtering whitespace out of the // list. if (parentType != eTypeBlock && !aFrame->IsGeneratedContentFrame()) { // For leading whitespace followed by a kid that wants our parent type, // there are four cases: // 1) We have a previous sibling which is not a table pseudo. That means // that previous sibling wanted a (non-block) parent of the type we're // looking at. Then the whitespace comes between two table-internal // elements, so should be collapsed out. // 2) We have a previous sibling which is a table pseudo. It might have // kids who want this whitespace, so we need to reframe. // 3) We have no previous sibling and our parent frame is not a table // pseudo. That means that we'll be at the beginning of our actual // non-block-type parent, and the whitespace is OK to collapse out. // If something is ever inserted before us, it'll find our own parent // as its parent and if it's something that would care about the // whitespace it'll want a block parent, so it'll trigger a reframe at // that point. // 4) We have no previous sibling and our parent frame is a table pseudo. // Need to reframe. // All that is predicated on finding the correct previous sibling. We // might have to walk backwards along continuations from aFrame to do so. // // It's always OK to drop whitespace between any two items that want a // parent of type parentType. // // For trailing whitespace preceded by a kid that wants our parent type, // there are four cases: // 1) We have a next sibling which is not a table pseudo. That means // that next sibling wanted a (non-block) parent of the type we're // looking at. Then the whitespace comes between two table-internal // elements, so should be collapsed out. // 2) We have a next sibling which is a table pseudo. It might have // kids who want this whitespace, so we need to reframe. // 3) We have no next sibling and our parent frame is not a table // pseudo. That means that we'll be at the end of our actual // non-block-type parent, and the whitespace is OK to collapse out. // If something is ever inserted after us, it'll find our own parent // as its parent and if it's something that would care about the // whitespace it'll want a block parent, so it'll trigger a reframe at // that point. // 4) We have no next sibling and our parent frame is a table pseudo. // Need to reframe. // All that is predicated on finding the correct next sibling. We might // have to walk forward along continuations from aFrame to do so. That // said, in the case when nextSibling is null at this point and aIsAppend // is true, we know we're in case 3. Furthermore, in that case we don't // even have to worry about the table pseudo situation; we know our // parent is not a table pseudo there. FCItemIterator iter(aItems); FCItemIterator start(iter); do { if (iter.SkipItemsWantingParentType(parentType)) { break; } // iter points to an item that wants a different parent. If it's not // whitespace, we're done; no more point scanning the list. if (!iter.item().IsWhitespace(aState)) { break; } if (iter == start) { // Leading whitespace. How to handle this depends on our // previous sibling and aFrame. See the long comment above. nsIFrame* prevSibling = aPrevSibling; if (!prevSibling) { // Try to find one after all nsIFrame* parentPrevCont = aFrame->GetPrevContinuation(); while (parentPrevCont) { prevSibling = parentPrevCont->GetLastChild(kPrincipalList); if (prevSibling) { break; } parentPrevCont = parentPrevCont->GetPrevContinuation(); } }; if (prevSibling) { if (IsTablePseudo(prevSibling)) { // need to reframe break; } } else if (IsTablePseudo(aFrame)) { // need to reframe break; } } FCItemIterator spaceEndIter(iter); // Advance spaceEndIter past any whitespace bool trailingSpaces = spaceEndIter.SkipWhitespace(aState); bool okToDrop; if (trailingSpaces) { // Trailing whitespace. How to handle this depeds on aIsAppend, our // next sibling and aFrame. See the long comment above. okToDrop = aIsAppend && !nextSibling; if (!okToDrop) { if (!nextSibling) { // Try to find one after all nsIFrame* parentNextCont = aFrame->GetNextContinuation(); while (parentNextCont) { nextSibling = parentNextCont->GetFirstPrincipalChild(); if (nextSibling) { break; } parentNextCont = parentNextCont->GetNextContinuation(); } } okToDrop = (nextSibling && !IsTablePseudo(nextSibling)) || (!nextSibling && !IsTablePseudo(aFrame)); } #ifdef DEBUG else { NS_ASSERTION(!IsTablePseudo(aFrame), "How did that happen?"); } #endif } else { okToDrop = (spaceEndIter.item().DesiredParentType() == parentType); } if (okToDrop) { iter.DeleteItemsTo(spaceEndIter); } else { // We're done: we don't want to drop the whitespace, and it has the // wrong parent type. break; } // Now loop, since |iter| points to item right after the whitespace we // removed. } while (!iter.IsDone()); } // We might be able to figure out some sort of optimizations here, but they // would have to depend on having a correct aPrevSibling and a correct next // sibling. For example, we can probably avoid reframing if none of // aFrame, aPrevSibling, and next sibling are table pseudo-frames. But it // doesn't seem worth it to worry about that for now, especially since we // in fact do not have a reliable aPrevSibling, nor any next sibling, in // this method. // aItems might have changed, so recheck the parent type thing. In fact, // it might be empty, so recheck that too. if (aItems.IsEmpty()) { return false; } if (!aItems.AllWantParentType(parentType)) { // Reframing aFrame->GetContent() is good enough, since the content of // table pseudo-frames is the ancestor content. RecreateFramesForContent(aFrame->GetContent(), true); return true; } } // Now we have several cases involving {ib} splits. Put them all in a // do/while with breaks to take us to the "go and reconstruct" code. do { if (IsInlineFrame(aFrame)) { if (aItems.AreAllItemsInline()) { // We can just put the kids in. return false; } if (!IsFrameSpecial(aFrame)) { // Need to go ahead and reconstruct. break; } // Now we're adding kids including some blocks to an inline part of an // {ib} split. If we plan to call AppendFrames, and don't have a next // sibling for the new frames, and our parent is the last continuation of // the last part of the {ib} split, and the same is true of all our // ancestor inlines (they have no following continuations and they're the // last part of their {ib} splits and we'd be adding to the end for all // of them), then AppendFrames will handle things for us. Bail out in // that case. if (aIsAppend && IsSafeToAppendToSpecialInline(aFrame, nextSibling)) { return false; } // Need to reconstruct. break; } // Now we know we have a block parent. If it's not special, we're all set. if (!IsFrameSpecial(aFrame)) { return false; } // We're adding some kids to a block part of an {ib} split. If all the // kids are blocks, we don't need to reconstruct. if (aItems.AreAllItemsBlock()) { return false; } // We might have some inline kids for this block. Just reconstruct. break; } while (0); // If we don't have a containing block, start with aFrame and look for one. if (!aContainingBlock) { aContainingBlock = aFrame; } // To find the right block to reframe, just walk up the tree until we find a // frame that is: // 1) Not part of an IB split (not special) // 2) Not a pseudo-frame // 3) Not an inline frame // We're guaranteed to find one, since nsStyleContext::ApplyStyleFixups // enforces that the root is display:none, display:table, or display:block. // Note that walking up "too far" is OK in terms of correctness, even if it // might be a little inefficient. This is why we walk out of all // pseudo-frames -- telling which ones are or are not OK to walk out of is // too hard (and I suspect that we do in fact need to walk out of all of // them). while (IsFrameSpecial(aContainingBlock) || aContainingBlock->IsInlineOutside() || aContainingBlock->GetStyleContext()->GetPseudo()) { aContainingBlock = aContainingBlock->GetParent(); NS_ASSERTION(aContainingBlock, "Must have non-inline, non-special, non-pseudo frame as root " "(or child of root, for a table root)!"); } // Tell parent of the containing block to reformulate the // entire block. This is painful and definitely not optimal // but it will *always* get the right answer. nsIContent *blockContent = aContainingBlock->GetContent(); #ifdef DEBUG if (gNoisyContentUpdates) { printf("nsCSSFrameConstructor::WipeContainingBlock: blockContent=%p\n", static_cast(blockContent)); } #endif RecreateFramesForContent(blockContent, true); return true; } nsresult nsCSSFrameConstructor::ReframeContainingBlock(nsIFrame* aFrame) { #ifdef DEBUG // ReframeContainingBlock is a NASTY routine, it causes terrible performance problems // so I want to see when it is happening! Unfortunately, it is happening way to often because // so much content on the web causes 'special' block-in-inline frame situations and we handle them // very poorly if (gNoisyContentUpdates) { printf("nsCSSFrameConstructor::ReframeContainingBlock frame=%p\n", static_cast(aFrame)); } #endif // XXXbz how exactly would we get here while isReflowing anyway? Should this // whole test be ifdef DEBUG? if (mPresShell->IsReflowLocked()) { // don't ReframeContainingBlock, this will result in a crash // if we remove a tree that's in reflow - see bug 121368 for testcase NS_ERROR("Atemptted to nsCSSFrameConstructor::ReframeContainingBlock during a Reflow!!!"); return NS_OK; } // Get the first "normal" ancestor of the target frame. nsIFrame* containingBlock = GetIBContainingBlockFor(aFrame); if (containingBlock) { // From here we look for the containing block in case the target // frame is already a block (which can happen when an inline frame // wraps some of its content in an anonymous block; see // ConstructInline) // NOTE: We used to get the FloatContainingBlock here, but it was often wrong. // GetIBContainingBlock works much better and provides the correct container in all cases // so GetFloatContainingBlock(aFrame) has been removed // And get the containingBlock's content nsCOMPtr blockContent = containingBlock->GetContent(); if (blockContent) { #ifdef DEBUG if (gNoisyContentUpdates) { printf(" ==> blockContent=%p\n", static_cast(blockContent)); } #endif return RecreateFramesForContent(blockContent, true); } } // If we get here, we're screwed! return RecreateFramesForContent(mPresShell->GetDocument()->GetRootElement(), true); } void nsCSSFrameConstructor::RestyleForEmptyChange(Element* aContainer) { // In some cases (:empty + E, :empty ~ E), a change if the content of // an element requires restyling its parent's siblings. nsRestyleHint hint = eRestyle_Subtree; nsIContent* grandparent = aContainer->GetParent(); if (grandparent && (grandparent->GetFlags() & NODE_HAS_SLOW_SELECTOR_LATER_SIBLINGS)) { hint = nsRestyleHint(hint | eRestyle_LaterSiblings); } PostRestyleEvent(aContainer, hint, NS_STYLE_HINT_NONE); } void nsCSSFrameConstructor::RestyleForAppend(Element* aContainer, nsIContent* aFirstNewContent) { NS_ASSERTION(aContainer, "must have container for append"); #ifdef DEBUG { for (nsIContent* cur = aFirstNewContent; cur; cur = cur->GetNextSibling()) { NS_ASSERTION(!cur->IsRootOfAnonymousSubtree(), "anonymous nodes should not be in child lists"); } } #endif uint32_t selectorFlags = aContainer->GetFlags() & (NODE_ALL_SELECTOR_FLAGS & ~NODE_HAS_SLOW_SELECTOR_LATER_SIBLINGS); if (selectorFlags == 0) return; if (selectorFlags & NODE_HAS_EMPTY_SELECTOR) { // see whether we need to restyle the container bool wasEmpty = true; // :empty or :-moz-only-whitespace for (nsIContent* cur = aContainer->GetFirstChild(); cur != aFirstNewContent; cur = cur->GetNextSibling()) { // We don't know whether we're testing :empty or :-moz-only-whitespace, // so be conservative and assume :-moz-only-whitespace (i.e., make // IsSignificantChild less likely to be true, and thus make us more // likely to restyle). if (nsStyleUtil::IsSignificantChild(cur, true, false)) { wasEmpty = false; break; } } if (wasEmpty) { RestyleForEmptyChange(aContainer); return; } } if (selectorFlags & NODE_HAS_SLOW_SELECTOR) { PostRestyleEvent(aContainer, eRestyle_Subtree, NS_STYLE_HINT_NONE); // Restyling the container is the most we can do here, so we're done. return; } if (selectorFlags & NODE_HAS_EDGE_CHILD_SELECTOR) { // restyle the last element child before this node for (nsIContent* cur = aFirstNewContent->GetPreviousSibling(); cur; cur = cur->GetPreviousSibling()) { if (cur->IsElement()) { PostRestyleEvent(cur->AsElement(), eRestyle_Subtree, NS_STYLE_HINT_NONE); break; } } } } // Needed since we can't use PostRestyleEvent on non-elements (with // eRestyle_LaterSiblings or nsRestyleHint(eRestyle_Subtree | // eRestyle_LaterSiblings) as appropriate). static void RestyleSiblingsStartingWith(nsCSSFrameConstructor *aFrameConstructor, nsIContent *aStartingSibling /* may be null */) { for (nsIContent *sibling = aStartingSibling; sibling; sibling = sibling->GetNextSibling()) { if (sibling->IsElement()) { aFrameConstructor-> PostRestyleEvent(sibling->AsElement(), nsRestyleHint(eRestyle_Subtree | eRestyle_LaterSiblings), NS_STYLE_HINT_NONE); break; } } } // Restyling for a ContentInserted or CharacterDataChanged notification. // This could be used for ContentRemoved as well if we got the // notification before the removal happened (and sometimes // CharacterDataChanged is more like a removal than an addition). // The comments are written and variables are named in terms of it being // a ContentInserted notification. void nsCSSFrameConstructor::RestyleForInsertOrChange(Element* aContainer, nsIContent* aChild) { NS_ASSERTION(!aChild->IsRootOfAnonymousSubtree(), "anonymous nodes should not be in child lists"); uint32_t selectorFlags = aContainer ? (aContainer->GetFlags() & NODE_ALL_SELECTOR_FLAGS) : 0; if (selectorFlags == 0) return; if (selectorFlags & NODE_HAS_EMPTY_SELECTOR) { // see whether we need to restyle the container bool wasEmpty = true; // :empty or :-moz-only-whitespace for (nsIContent* child = aContainer->GetFirstChild(); child; child = child->GetNextSibling()) { if (child == aChild) continue; // We don't know whether we're testing :empty or :-moz-only-whitespace, // so be conservative and assume :-moz-only-whitespace (i.e., make // IsSignificantChild less likely to be true, and thus make us more // likely to restyle). if (nsStyleUtil::IsSignificantChild(child, true, false)) { wasEmpty = false; break; } } if (wasEmpty) { RestyleForEmptyChange(aContainer); return; } } if (selectorFlags & NODE_HAS_SLOW_SELECTOR) { PostRestyleEvent(aContainer, eRestyle_Subtree, NS_STYLE_HINT_NONE); // Restyling the container is the most we can do here, so we're done. return; } if (selectorFlags & NODE_HAS_SLOW_SELECTOR_LATER_SIBLINGS) { // Restyle all later siblings. RestyleSiblingsStartingWith(this, aChild->GetNextSibling()); } if (selectorFlags & NODE_HAS_EDGE_CHILD_SELECTOR) { // restyle the previously-first element child if it is after this node bool passedChild = false; for (nsIContent* content = aContainer->GetFirstChild(); content; content = content->GetNextSibling()) { if (content == aChild) { passedChild = true; continue; } if (content->IsElement()) { if (passedChild) { PostRestyleEvent(content->AsElement(), eRestyle_Subtree, NS_STYLE_HINT_NONE); } break; } } // restyle the previously-last element child if it is before this node passedChild = false; for (nsIContent* content = aContainer->GetLastChild(); content; content = content->GetPreviousSibling()) { if (content == aChild) { passedChild = true; continue; } if (content->IsElement()) { if (passedChild) { PostRestyleEvent(content->AsElement(), eRestyle_Subtree, NS_STYLE_HINT_NONE); } break; } } } } void nsCSSFrameConstructor::RestyleForRemove(Element* aContainer, nsIContent* aOldChild, nsIContent* aFollowingSibling) { if (aOldChild->IsRootOfAnonymousSubtree()) { // This should be an assert, but this is called incorrectly in // nsHTMLEditor::DeleteRefToAnonymousNode and the assertions were clogging // up the logs. Make it an assert again when that's fixed. NS_WARNING("anonymous nodes should not be in child lists (bug 439258)"); } uint32_t selectorFlags = aContainer ? (aContainer->GetFlags() & NODE_ALL_SELECTOR_FLAGS) : 0; if (selectorFlags == 0) return; if (selectorFlags & NODE_HAS_EMPTY_SELECTOR) { // see whether we need to restyle the container bool isEmpty = true; // :empty or :-moz-only-whitespace for (nsIContent* child = aContainer->GetFirstChild(); child; child = child->GetNextSibling()) { // We don't know whether we're testing :empty or :-moz-only-whitespace, // so be conservative and assume :-moz-only-whitespace (i.e., make // IsSignificantChild less likely to be true, and thus make us more // likely to restyle). if (nsStyleUtil::IsSignificantChild(child, true, false)) { isEmpty = false; break; } } if (isEmpty) { RestyleForEmptyChange(aContainer); return; } } if (selectorFlags & NODE_HAS_SLOW_SELECTOR) { PostRestyleEvent(aContainer, eRestyle_Subtree, NS_STYLE_HINT_NONE); // Restyling the container is the most we can do here, so we're done. return; } if (selectorFlags & NODE_HAS_SLOW_SELECTOR_LATER_SIBLINGS) { // Restyle all later siblings. RestyleSiblingsStartingWith(this, aFollowingSibling); } if (selectorFlags & NODE_HAS_EDGE_CHILD_SELECTOR) { // restyle the now-first element child if it was after aOldChild bool reachedFollowingSibling = false; for (nsIContent* content = aContainer->GetFirstChild(); content; content = content->GetNextSibling()) { if (content == aFollowingSibling) { reachedFollowingSibling = true; // do NOT continue here; we might want to restyle this node } if (content->IsElement()) { if (reachedFollowingSibling) { PostRestyleEvent(content->AsElement(), eRestyle_Subtree, NS_STYLE_HINT_NONE); } break; } } // restyle the now-last element child if it was before aOldChild reachedFollowingSibling = (aFollowingSibling == nullptr); for (nsIContent* content = aContainer->GetLastChild(); content; content = content->GetPreviousSibling()) { if (content->IsElement()) { if (reachedFollowingSibling) { PostRestyleEvent(content->AsElement(), eRestyle_Subtree, NS_STYLE_HINT_NONE); } break; } if (content == aFollowingSibling) { reachedFollowingSibling = true; } } } } void nsCSSFrameConstructor::RebuildAllStyleData(nsChangeHint aExtraHint) { NS_ASSERTION(!(aExtraHint & nsChangeHint_ReconstructFrame), "Should not reconstruct the root of the frame tree. " "Use ReconstructDocElementHierarchy instead."); mRebuildAllStyleData = false; NS_UpdateHint(aExtraHint, mRebuildAllExtraHint); mRebuildAllExtraHint = nsChangeHint(0); if (!mPresShell || !mPresShell->GetRootFrame()) return; // Make sure that the viewmanager will outlive the presshell nsCOMPtr vm = mPresShell->GetViewManager(); // Processing the style changes could cause a flush that propagates to // the parent frame and thus destroys the pres shell. nsCOMPtr kungFuDeathGrip(mPresShell); // We may reconstruct frames below and hence process anything that is in the // tree. We don't want to get notified to process those items again after. mPresShell->GetDocument()->FlushPendingNotifications(Flush_ContentAndNotify); nsAutoScriptBlocker scriptBlocker; // Tell the style set to get the old rule tree out of the way // so we can recalculate while maintaining rule tree immutability nsresult rv = mPresShell->StyleSet()->BeginReconstruct(); if (NS_FAILED(rv)) { return; } nsPresContext *presContext = mPresShell->GetPresContext(); presContext->SetProcessingRestyles(true); // Recalculate all of the style contexts for the document // Note that we can ignore the return value of ComputeStyleChangeFor // because we never need to reframe the root frame // XXX This could be made faster by not rerunning rule matching // (but note that nsPresShell::SetPreferenceStyleRules currently depends // on us re-running rule matching here nsStyleChangeList changeList; // XXX Does it matter that we're passing aExtraHint to the real root // frame and not the root node's primary frame? // Note: The restyle tracker we pass in here doesn't matter. ComputeStyleChangeFor(mPresShell->GetRootFrame(), &changeList, aExtraHint, mPendingRestyles, true); // Process the required changes ProcessRestyledFrames(changeList); presContext->SetProcessingRestyles(false); // Make sure that we process any pending animation restyles from the // above style change. Note that we can *almost* implement the above // by just posting a style change -- except we really need to restyle // the root frame rather than the root element's primary frame. ProcessPendingRestyles(); // Tell the style set it's safe to destroy the old rule tree. We // must do this after the ProcessRestyledFrames call in case the // change list has frame reconstructs in it (since frames to be // reconstructed will still have their old style context pointers // until they are destroyed). mPresShell->StyleSet()->EndReconstruct(); } void nsCSSFrameConstructor::ProcessPendingRestyles() { NS_PRECONDITION(mDocument, "No document? Pshaw!"); NS_PRECONDITION(!nsContentUtils::IsSafeToRunScript(), "Missing a script blocker!"); // Process non-animation restyles... nsPresContext *presContext = mPresShell->GetPresContext(); NS_ABORT_IF_FALSE(!presContext->IsProcessingRestyles(), "Nesting calls to ProcessPendingRestyles?"); presContext->SetProcessingRestyles(true); mPendingRestyles.ProcessRestyles(); #ifdef DEBUG uint32_t oldPendingRestyleCount = mPendingRestyles.Count(); #endif // ...and then process animation restyles. This needs to happen // second because we need to start animations that resulted from the // first set of restyles (e.g., CSS transitions with negative // transition-delay), and because we need to immediately // restyle-with-animation any just-restyled elements that are // mid-transition (since processing the non-animation restyle ignores // the running transition so it can check for a new change on the same // property, and then posts an immediate animation style change). presContext->SetProcessingAnimationStyleChange(true); mPendingAnimationRestyles.ProcessRestyles(); presContext->SetProcessingAnimationStyleChange(false); presContext->SetProcessingRestyles(false); NS_POSTCONDITION(mPendingRestyles.Count() == oldPendingRestyleCount, "We should not have posted new non-animation restyles while " "processing animation restyles"); if (mRebuildAllStyleData) { // We probably wasted a lot of work up above, but this seems safest // and it should be rarely used. // This might add us as a refresh observer again; that's ok. RebuildAllStyleData(nsChangeHint(0)); } } void nsCSSFrameConstructor::PostRestyleEventCommon(Element* aElement, nsRestyleHint aRestyleHint, nsChangeHint aMinChangeHint, bool aForAnimation) { if (NS_UNLIKELY(mPresShell->IsDestroying())) { return; } if (aRestyleHint == 0 && !aMinChangeHint) { // Nothing to do here return; } RestyleTracker& tracker = aForAnimation ? mPendingAnimationRestyles : mPendingRestyles; tracker.AddPendingRestyle(aElement, aRestyleHint, aMinChangeHint); PostRestyleEventInternal(false); } void nsCSSFrameConstructor::PostRestyleEventInternal(bool aForLazyConstruction) { // Make sure we're not in a style refresh; if we are, we still have // a call to ProcessPendingRestyles coming and there's no need to // add ourselves as a refresh observer until then. bool inRefresh = !aForLazyConstruction && mInStyleRefresh; if (!mObservingRefreshDriver && !inRefresh) { mObservingRefreshDriver = mPresShell->GetPresContext()->RefreshDriver()-> AddStyleFlushObserver(mPresShell); } // Unconditionally flag our document as needing a flush. The other // option here would be a dedicated boolean to track whether we need // to do so (set here and unset in ProcessPendingRestyles). mPresShell->GetDocument()->SetNeedStyleFlush(); } void nsCSSFrameConstructor::PostRebuildAllStyleDataEvent(nsChangeHint aExtraHint) { NS_ASSERTION(!(aExtraHint & nsChangeHint_ReconstructFrame), "Should not reconstruct the root of the frame tree. " "Use ReconstructDocElementHierarchy instead."); mRebuildAllStyleData = true; NS_UpdateHint(mRebuildAllExtraHint, aExtraHint); // Get a restyle event posted if necessary PostRestyleEventInternal(false); } nsresult nsCSSFrameConstructor::GenerateChildFrames(nsIFrame* aFrame) { { nsAutoScriptBlocker scriptBlocker; BeginUpdate(); nsFrameItems childItems; nsFrameConstructorState state(mPresShell, nullptr, nullptr, nullptr); // We don't have a parent frame with a pending binding constructor here, // so no need to worry about ordering of the kids' constructors with it. // Pass null for the PendingBinding. nsresult rv = ProcessChildren(state, aFrame->GetContent(), aFrame->GetStyleContext(), aFrame, false, childItems, false, nullptr); if (NS_FAILED(rv)) { EndUpdate(); return rv; } aFrame->SetInitialChildList(kPrincipalList, childItems); EndUpdate(); } #ifdef ACCESSIBILITY nsAccessibilityService* accService = nsIPresShell::AccService(); if (accService) { nsIContent* container = aFrame->GetContent(); nsIContent* child = container->GetFirstChild(); if (child) { accService->ContentRangeInserted(mPresShell, container, child, nullptr); } } #endif // call XBL constructors after the frames are created mPresShell->GetDocument()->BindingManager()->ProcessAttachedQueue(); return NS_OK; } ////////////////////////////////////////////////////////// // nsCSSFrameConstructor::FrameConstructionItem methods // ////////////////////////////////////////////////////////// bool nsCSSFrameConstructor:: FrameConstructionItem::IsWhitespace(nsFrameConstructorState& aState) const { NS_PRECONDITION(aState.mCreatingExtraFrames || !mContent->GetPrimaryFrame(), "How did that happen?"); if (!mIsText) { return false; } mContent->SetFlags(NS_CREATE_FRAME_IF_NON_WHITESPACE | NS_REFRAME_IF_WHITESPACE); return mContent->TextIsOnlyWhitespace(); } ////////////////////////////////////////////////////////////// // nsCSSFrameConstructor::FrameConstructionItemList methods // ////////////////////////////////////////////////////////////// void nsCSSFrameConstructor::FrameConstructionItemList:: AdjustCountsForItem(FrameConstructionItem* aItem, int32_t aDelta) { NS_PRECONDITION(aDelta == 1 || aDelta == -1, "Unexpected delta"); mItemCount += aDelta; if (aItem->mIsAllInline) { mInlineCount += aDelta; } if (aItem->mIsBlock) { mBlockCount += aDelta; } if (aItem->mIsLineParticipant) { mLineParticipantCount += aDelta; } mDesiredParentCounts[aItem->DesiredParentType()] += aDelta; } //////////////////////////////////////////////////////////////////////// // nsCSSFrameConstructor::FrameConstructionItemList::Iterator methods // //////////////////////////////////////////////////////////////////////// inline bool nsCSSFrameConstructor::FrameConstructionItemList:: Iterator::SkipItemsWantingParentType(ParentType aParentType) { NS_PRECONDITION(!IsDone(), "Shouldn't be done yet"); while (item().DesiredParentType() == aParentType) { Next(); if (IsDone()) { return true; } } return false; } #ifdef MOZ_FLEXBOX bool nsCSSFrameConstructor::FrameConstructionItem:: NeedsAnonFlexItem(const nsFrameConstructorState& aState) { if (mFCData->mBits & FCDATA_IS_LINE_PARTICIPANT) { // This will be an inline non-replaced box. return true; } if (!(mFCData->mBits & FCDATA_DISALLOW_OUT_OF_FLOW) && aState.GetGeometricParent(mStyleContext->GetStyleDisplay(), nullptr)) { // We're abspos or fixedpos, which means we'll spawn a placeholder which // we'll need to wrap in an anonymous flex item. So, we just treat // _this_ frame as if _it_ needs to be wrapped in an anonymous flex item, // and then when we spawn the placeholder, it'll end up in the right spot. return true; } return false; } inline bool nsCSSFrameConstructor::FrameConstructionItemList:: Iterator::SkipItemsThatNeedAnonFlexItem( const nsFrameConstructorState& aState) { NS_PRECONDITION(!IsDone(), "Shouldn't be done yet"); while (item().NeedsAnonFlexItem(aState)) { Next(); if (IsDone()) { return true; } } return false; } inline bool nsCSSFrameConstructor::FrameConstructionItemList:: Iterator::SkipItemsThatDontNeedAnonFlexItem( const nsFrameConstructorState& aState) { NS_PRECONDITION(!IsDone(), "Shouldn't be done yet"); while (!(item().NeedsAnonFlexItem(aState))) { Next(); if (IsDone()) { return true; } } return false; } #endif // MOZ_FLEXBOX inline bool nsCSSFrameConstructor::FrameConstructionItemList:: Iterator::SkipWhitespace(nsFrameConstructorState& aState) { NS_PRECONDITION(!IsDone(), "Shouldn't be done yet"); NS_PRECONDITION(item().IsWhitespace(aState), "Not pointing to whitespace?"); do { Next(); if (IsDone()) { return true; } } while (item().IsWhitespace(aState)); return false; } void nsCSSFrameConstructor::FrameConstructionItemList:: Iterator::AppendItemToList(FrameConstructionItemList& aTargetList) { NS_ASSERTION(&aTargetList != &mList, "Unexpected call"); NS_PRECONDITION(!IsDone(), "should not be done"); FrameConstructionItem* item = ToItem(mCurrent); Next(); PR_REMOVE_LINK(item); PR_APPEND_LINK(item, &aTargetList.mItems); mList.AdjustCountsForItem(item, -1); aTargetList.AdjustCountsForItem(item, 1); } void nsCSSFrameConstructor::FrameConstructionItemList:: Iterator::AppendItemsToList(const Iterator& aEnd, FrameConstructionItemList& aTargetList) { NS_ASSERTION(&aTargetList != &mList, "Unexpected call"); NS_PRECONDITION(mEnd == aEnd.mEnd, "end iterator for some other list?"); // We can't just move our guts to the other list if it already has // some information or if we're not moving our entire list. if (!AtStart() || !aEnd.IsDone() || !aTargetList.IsEmpty() || !aTargetList.mUndisplayedItems.IsEmpty()) { do { AppendItemToList(aTargetList); } while (*this != aEnd); return; } // move over the list of items PR_INSERT_AFTER(&aTargetList.mItems, &mList.mItems); // Need to init when we remove to makd ~FrameConstructionItemList work right. PR_REMOVE_AND_INIT_LINK(&mList.mItems); // Copy over the various counters aTargetList.mInlineCount = mList.mInlineCount; aTargetList.mBlockCount = mList.mBlockCount; aTargetList.mLineParticipantCount = mList.mLineParticipantCount; aTargetList.mItemCount = mList.mItemCount; memcpy(aTargetList.mDesiredParentCounts, mList.mDesiredParentCounts, sizeof(aTargetList.mDesiredParentCounts)); // Swap out undisplayed item arrays, before we nuke the array on our end aTargetList.mUndisplayedItems.SwapElements(mList.mUndisplayedItems); // reset mList mList.~FrameConstructionItemList(); new (&mList) FrameConstructionItemList(); // Point ourselves to aEnd, as advertised mCurrent = mEnd = &mList.mItems; NS_POSTCONDITION(*this == aEnd, "How did that happen?"); } void nsCSSFrameConstructor::FrameConstructionItemList:: Iterator::InsertItem(FrameConstructionItem* aItem) { // Just insert the item before us. There's no magic here. PR_INSERT_BEFORE(aItem, mCurrent); mList.AdjustCountsForItem(aItem, 1); NS_POSTCONDITION(PR_NEXT_LINK(aItem) == mCurrent, "How did that happen?"); } void nsCSSFrameConstructor::FrameConstructionItemList:: Iterator::DeleteItemsTo(const Iterator& aEnd) { NS_PRECONDITION(mEnd == aEnd.mEnd, "end iterator for some other list?"); NS_PRECONDITION(*this != aEnd, "Shouldn't be at aEnd yet"); do { NS_ASSERTION(!IsDone(), "Ran off end of list?"); FrameConstructionItem* item = ToItem(mCurrent); Next(); PR_REMOVE_LINK(item); mList.AdjustCountsForItem(item, -1); delete item; } while (*this != aEnd); } bool nsCSSFrameConstructor::RecomputePosition(nsIFrame* aFrame) { // Don't process position changes on table frames, since we already handle // the dynamic position change on the outer table frame, and the reflow-based // fallback code path also ignores positions on inner table frames. if (aFrame->GetType() == nsGkAtoms::tableFrame) { return true; } // Don't process position changes on frames which have views or the ones which // have a view somewhere in their descendants, because the corresponding view // needs to be repositioned properly as well. if (aFrame->HasView() || (aFrame->GetStateBits() & NS_FRAME_HAS_CHILD_WITH_VIEW)) { StyleChangeReflow(aFrame, nsChangeHint_NeedReflow); return false; } const nsStyleDisplay* display = aFrame->GetStyleDisplay(); // Changes to the offsets of a non-positioned element can safely be ignored. if (display->mPosition == NS_STYLE_POSITION_STATIC) { return true; } aFrame->SchedulePaint(); // For relative positioning, we can simply update the frame rect if (display->mPosition == NS_STYLE_POSITION_RELATIVE) { nsIFrame* cb = aFrame->GetContainingBlock(); const nsSize size = cb->GetSize(); const nsPoint oldOffsets = aFrame->GetRelativeOffset(); nsMargin newOffsets; // Move the frame nsHTMLReflowState::ComputeRelativeOffsets( cb->GetStyleVisibility()->mDirection, aFrame, size.width, size.height, newOffsets); NS_ASSERTION(newOffsets.left == -newOffsets.right && newOffsets.top == -newOffsets.bottom, "ComputeRelativeOffsets should return valid results"); aFrame->SetPosition(aFrame->GetPosition() - oldOffsets + nsPoint(newOffsets.left, newOffsets.top)); return true; } // For absolute positioning, the width can potentially change if width is // auto and either of left or right are not. The height can also potentially // change if height is auto and either of top or bottom are not. In these // cases we fall back to a reflow, and in all other cases, we attempt to // move the frame here. // Note that it is possible for the dimensions to not change in the above // cases, so we should be a little smarter here and only fall back to reflow // when the dimensions will really change (bug 745485). const nsStylePosition* position = aFrame->GetStylePosition(); if (position->mWidth.GetUnit() != eStyleUnit_Auto && position->mHeight.GetUnit() != eStyleUnit_Auto) { // For the absolute positioning case, set up a fake HTML reflow state for // the frame, and then get the offsets from it. nsRefPtr rc = aFrame->PresContext()->GetPresShell()-> GetReferenceRenderingContext(); // Construct a bogus parent reflow state so that there's a usable // containing block reflow state. nsIFrame *parentFrame = aFrame->GetParent(); nsSize parentSize = parentFrame->GetSize(); nsFrameState savedState = parentFrame->GetStateBits(); nsHTMLReflowState parentReflowState(aFrame->PresContext(), parentFrame, rc, parentSize); parentFrame->RemoveStateBits(~nsFrameState(0)); parentFrame->AddStateBits(savedState); NS_WARN_IF_FALSE(parentSize.width != NS_INTRINSICSIZE && parentSize.height != NS_INTRINSICSIZE, "parentSize should be valid"); parentReflowState.SetComputedWidth(NS_MAX(parentSize.width, 0)); parentReflowState.SetComputedHeight(NS_MAX(parentSize.height, 0)); parentReflowState.mComputedMargin.SizeTo(0, 0, 0, 0); parentSize.height = NS_AUTOHEIGHT; parentReflowState.mComputedPadding = parentFrame->GetUsedPadding(); parentReflowState.mComputedBorderPadding = parentFrame->GetUsedBorderAndPadding(); nsSize availSize(parentSize.width, NS_INTRINSICSIZE); nsSize size = aFrame->GetSize(); nsSize cbSize = aFrame->GetContainingBlock()->GetSize(); const nsMargin& parentBorder = parentReflowState.mStyleBorder->GetComputedBorder(); cbSize -= nsSize(parentBorder.LeftRight(), parentBorder.TopBottom()); nsHTMLReflowState reflowState(aFrame->PresContext(), parentReflowState, aFrame, availSize, cbSize.width, cbSize.height); // If we're solving for 'left' or 'top', then compute it here, in order to // match the reflow code path. if (NS_AUTOOFFSET == reflowState.mComputedOffsets.left) { reflowState.mComputedOffsets.left = cbSize.width - reflowState.mComputedOffsets.right - reflowState.mComputedMargin.right - size.width - reflowState.mComputedMargin.left; } if (NS_AUTOOFFSET == reflowState.mComputedOffsets.top) { reflowState.mComputedOffsets.top = cbSize.height - reflowState.mComputedOffsets.bottom - reflowState.mComputedMargin.bottom - size.height - reflowState.mComputedMargin.top; } // Move the frame nsPoint pos(parentBorder.left + reflowState.mComputedOffsets.left + reflowState.mComputedMargin.left, parentBorder.top + reflowState.mComputedOffsets.top + reflowState.mComputedMargin.top); aFrame->SetPosition(pos); return true; } // Fall back to a reflow StyleChangeReflow(aFrame, nsChangeHint_NeedReflow); return false; }