/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 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/. */ /* base class #1 for rendering objects that have child lists */ #include "nsContainerFrame.h" #include "nsAbsoluteContainingBlock.h" #include "nsIDocument.h" #include "nsPresContext.h" #include "nsStyleContext.h" #include "nsRect.h" #include "nsPoint.h" #include "nsStyleConsts.h" #include "nsView.h" #include "nsIPresShell.h" #include "nsCOMPtr.h" #include "nsGkAtoms.h" #include "nsViewManager.h" #include "nsIWidget.h" #include "nsCSSRendering.h" #include "nsError.h" #include "nsDisplayList.h" #include "nsIBaseWindow.h" #include "nsBoxLayoutState.h" #include "nsCSSFrameConstructor.h" #include "nsBlockFrame.h" #include "mozilla/AutoRestore.h" #include "nsIFrameInlines.h" #include "nsPrintfCString.h" #include #ifdef DEBUG #undef NOISY #else #undef NOISY #endif using namespace mozilla; using namespace mozilla::dom; using namespace mozilla::layout; NS_IMPL_FRAMEARENA_HELPERS(nsContainerFrame) nsContainerFrame::~nsContainerFrame() { } NS_QUERYFRAME_HEAD(nsContainerFrame) NS_QUERYFRAME_ENTRY(nsContainerFrame) NS_QUERYFRAME_TAIL_INHERITING(nsSplittableFrame) void nsContainerFrame::Init(nsIContent* aContent, nsContainerFrame* aParent, nsIFrame* aPrevInFlow) { nsSplittableFrame::Init(aContent, aParent, aPrevInFlow); if (aPrevInFlow) { // Make sure we copy bits from our prev-in-flow that will affect // us. A continuation for a container frame needs to know if it // has a child with a view so that we'll properly reposition it. if (aPrevInFlow->GetStateBits() & NS_FRAME_HAS_CHILD_WITH_VIEW) AddStateBits(NS_FRAME_HAS_CHILD_WITH_VIEW); } } void nsContainerFrame::SetInitialChildList(ChildListID aListID, nsFrameList& aChildList) { MOZ_ASSERT(mFrames.IsEmpty(), "unexpected second call to SetInitialChildList"); MOZ_ASSERT(aListID == kPrincipalList, "unexpected child list"); #ifdef DEBUG nsFrame::VerifyDirtyBitSet(aChildList); #endif mFrames.SetFrames(aChildList); } void nsContainerFrame::AppendFrames(ChildListID aListID, nsFrameList& aFrameList) { MOZ_ASSERT(aListID == kPrincipalList || aListID == kNoReflowPrincipalList, "unexpected child list"); if (aFrameList.NotEmpty()) { mFrames.AppendFrames(this, aFrameList); // Ask the parent frame to reflow me. if (aListID == kPrincipalList) { PresContext()->PresShell()-> FrameNeedsReflow(this, nsIPresShell::eTreeChange, NS_FRAME_HAS_DIRTY_CHILDREN); } } } void nsContainerFrame::InsertFrames(ChildListID aListID, nsIFrame* aPrevFrame, nsFrameList& aFrameList) { MOZ_ASSERT(aListID == kPrincipalList || aListID == kNoReflowPrincipalList, "unexpected child list"); NS_ASSERTION(!aPrevFrame || aPrevFrame->GetParent() == this, "inserting after sibling frame with different parent"); if (aFrameList.NotEmpty()) { // Insert frames after aPrevFrame mFrames.InsertFrames(this, aPrevFrame, aFrameList); if (aListID == kPrincipalList) { PresContext()->PresShell()-> FrameNeedsReflow(this, nsIPresShell::eTreeChange, NS_FRAME_HAS_DIRTY_CHILDREN); } } } void nsContainerFrame::RemoveFrame(ChildListID aListID, nsIFrame* aOldFrame) { MOZ_ASSERT(aListID == kPrincipalList || aListID == kNoReflowPrincipalList, "unexpected child list"); // Loop and destroy aOldFrame and all of its continuations. // Request a reflow on the parent frames involved unless we were explicitly // told not to (kNoReflowPrincipalList). bool generateReflowCommand = true; if (kNoReflowPrincipalList == aListID) { generateReflowCommand = false; } nsIPresShell* shell = PresContext()->PresShell(); nsContainerFrame* lastParent = nullptr; while (aOldFrame) { //XXXfr probably should use StealFrame here. I'm not sure if we need to // check the overflow lists atm, but we'll need a prescontext lookup // for overflow containers once we can split abspos elements with // inline containing blocks. nsIFrame* oldFrameNextContinuation = aOldFrame->GetNextContinuation(); nsContainerFrame* parent = aOldFrame->GetParent(); parent->StealFrame(aOldFrame, true); aOldFrame->Destroy(); aOldFrame = oldFrameNextContinuation; if (parent != lastParent && generateReflowCommand) { shell->FrameNeedsReflow(parent, nsIPresShell::eTreeChange, NS_FRAME_HAS_DIRTY_CHILDREN); lastParent = parent; } } } void nsContainerFrame::DestroyAbsoluteFrames(nsIFrame* aDestructRoot) { if (IsAbsoluteContainer()) { GetAbsoluteContainingBlock()->DestroyFrames(this, aDestructRoot); MarkAsNotAbsoluteContainingBlock(); } } void nsContainerFrame::SafelyDestroyFrameListProp(nsIFrame* aDestructRoot, nsIPresShell* aPresShell, FramePropertyTable* aPropTable, const FramePropertyDescriptor* aProp) { // Note that the last frame can be removed through another route and thus // delete the property -- that's why we fetch the property again before // removing each frame rather than fetching it once and iterating the list. while (nsFrameList* frameList = static_cast(aPropTable->Get(this, aProp))) { nsIFrame* frame = frameList->RemoveFirstChild(); if (MOZ_LIKELY(frame)) { frame->DestroyFrom(aDestructRoot); } else { aPropTable->Remove(this, aProp); frameList->Delete(aPresShell); return; } } } void nsContainerFrame::DestroyFrom(nsIFrame* aDestructRoot) { // Prevent event dispatch during destruction. if (HasView()) { GetView()->SetFrame(nullptr); } DestroyAbsoluteFrames(aDestructRoot); // Destroy frames on the principal child list. mFrames.DestroyFramesFrom(aDestructRoot); // Destroy frames on the auxiliary frame lists and delete the lists. nsPresContext* pc = PresContext(); nsIPresShell* shell = pc->PresShell(); FramePropertyTable* props = pc->PropertyTable(); SafelyDestroyFrameListProp(aDestructRoot, shell, props, OverflowProperty()); MOZ_ASSERT(IsFrameOfType(nsIFrame::eCanContainOverflowContainers) || !(props->Get(this, nsContainerFrame::OverflowContainersProperty()) || props->Get(this, nsContainerFrame::ExcessOverflowContainersProperty())), "this type of frame should't have overflow containers"); SafelyDestroyFrameListProp(aDestructRoot, shell, props, OverflowContainersProperty()); SafelyDestroyFrameListProp(aDestructRoot, shell, props, ExcessOverflowContainersProperty()); nsSplittableFrame::DestroyFrom(aDestructRoot); } ///////////////////////////////////////////////////////////////////////////// // Child frame enumeration const nsFrameList& nsContainerFrame::GetChildList(ChildListID aListID) const { // We only know about the principal child list and the overflow lists. switch (aListID) { case kPrincipalList: return mFrames; case kOverflowList: { nsFrameList* list = GetOverflowFrames(); return list ? *list : nsFrameList::EmptyList(); } case kOverflowContainersList: { nsFrameList* list = GetPropTableFrames(OverflowContainersProperty()); return list ? *list : nsFrameList::EmptyList(); } case kExcessOverflowContainersList: { nsFrameList* list = GetPropTableFrames(ExcessOverflowContainersProperty()); return list ? *list : nsFrameList::EmptyList(); } default: return nsSplittableFrame::GetChildList(aListID); } } static void AppendIfNonempty(const nsIFrame* aFrame, FramePropertyTable* aPropTable, const FramePropertyDescriptor* aProperty, nsTArray* aLists, nsIFrame::ChildListID aListID) { nsFrameList* list = static_cast( aPropTable->Get(aFrame, aProperty)); if (list) { list->AppendIfNonempty(aLists, aListID); } } void nsContainerFrame::GetChildLists(nsTArray* aLists) const { mFrames.AppendIfNonempty(aLists, kPrincipalList); FramePropertyTable* propTable = PresContext()->PropertyTable(); ::AppendIfNonempty(this, propTable, OverflowProperty(), aLists, kOverflowList); if (IsFrameOfType(nsIFrame::eCanContainOverflowContainers)) { ::AppendIfNonempty(this, propTable, OverflowContainersProperty(), aLists, kOverflowContainersList); ::AppendIfNonempty(this, propTable, ExcessOverflowContainersProperty(), aLists, kExcessOverflowContainersList); } nsSplittableFrame::GetChildLists(aLists); } ///////////////////////////////////////////////////////////////////////////// // Painting/Events void nsContainerFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder, const nsRect& aDirtyRect, const nsDisplayListSet& aLists) { DisplayBorderBackgroundOutline(aBuilder, aLists); BuildDisplayListForNonBlockChildren(aBuilder, aDirtyRect, aLists); } void nsContainerFrame::BuildDisplayListForNonBlockChildren(nsDisplayListBuilder* aBuilder, const nsRect& aDirtyRect, const nsDisplayListSet& aLists, uint32_t aFlags) { nsIFrame* kid = mFrames.FirstChild(); // Put each child's background directly onto the content list nsDisplayListSet set(aLists, aLists.Content()); // The children should be in content order while (kid) { BuildDisplayListForChild(aBuilder, kid, aDirtyRect, set, aFlags); kid = kid->GetNextSibling(); } } /* virtual */ void nsContainerFrame::ChildIsDirty(nsIFrame* aChild) { NS_ASSERTION(NS_SUBTREE_DIRTY(aChild), "child isn't actually dirty"); AddStateBits(NS_FRAME_HAS_DIRTY_CHILDREN); } bool nsContainerFrame::IsLeaf() const { return false; } nsIFrame::FrameSearchResult nsContainerFrame::PeekOffsetNoAmount(bool aForward, int32_t* aOffset) { NS_ASSERTION (aOffset && *aOffset <= 1, "aOffset out of range"); // Don't allow the caret to stay in an empty (leaf) container frame. return CONTINUE_EMPTY; } nsIFrame::FrameSearchResult nsContainerFrame::PeekOffsetCharacter(bool aForward, int32_t* aOffset, bool aRespectClusters) { NS_ASSERTION (aOffset && *aOffset <= 1, "aOffset out of range"); // Don't allow the caret to stay in an empty (leaf) container frame. return CONTINUE_EMPTY; } ///////////////////////////////////////////////////////////////////////////// // Helper member functions static nsresult ReparentFrameViewTo(nsIFrame* aFrame, nsViewManager* aViewManager, nsView* aNewParentView, nsView* aOldParentView) { // XXX What to do about placeholder views for "position: fixed" elements? // They should be reparented too. // Does aFrame have a view? if (aFrame->HasView()) { #ifdef MOZ_XUL if (aFrame->GetType() == nsGkAtoms::menuPopupFrame) { // This view must be parented by the root view, don't reparent it. return NS_OK; } #endif nsView* view = aFrame->GetView(); // Verify that the current parent view is what we think it is //nsView* parentView; //NS_ASSERTION(parentView == aOldParentView, "unexpected parent view"); aViewManager->RemoveChild(view); // The view will remember the Z-order and other attributes that have been set on it. nsView* insertBefore = nsLayoutUtils::FindSiblingViewFor(aNewParentView, aFrame); aViewManager->InsertChild(aNewParentView, view, insertBefore, insertBefore != nullptr); } else { nsIFrame::ChildListIterator lists(aFrame); for (; !lists.IsDone(); lists.Next()) { // Iterate the child frames, and check each child frame to see if it has // a view nsFrameList::Enumerator childFrames(lists.CurrentList()); for (; !childFrames.AtEnd(); childFrames.Next()) { ReparentFrameViewTo(childFrames.get(), aViewManager, aNewParentView, aOldParentView); } } } return NS_OK; } void nsContainerFrame::CreateViewForFrame(nsIFrame* aFrame, bool aForce) { if (aFrame->HasView()) { return; } // If we don't yet have a view, see if we need a view if (!aForce && !aFrame->NeedsView()) { // don't need a view return; } nsView* parentView = aFrame->GetParent()->GetClosestView(); NS_ASSERTION(parentView, "no parent with view"); nsViewManager* viewManager = parentView->GetViewManager(); NS_ASSERTION(viewManager, "null view manager"); // Create a view nsView* view = viewManager->CreateView(aFrame->GetRect(), parentView); SyncFrameViewProperties(aFrame->PresContext(), aFrame, nullptr, view); nsView* insertBefore = nsLayoutUtils::FindSiblingViewFor(parentView, aFrame); // we insert this view 'above' the insertBefore view, unless insertBefore is null, // in which case we want to call with aAbove == false to insert at the beginning // in document order viewManager->InsertChild(parentView, view, insertBefore, insertBefore != nullptr); // REVIEW: Don't create a widget for fixed-pos elements anymore. // ComputeRepaintRegionForCopy will calculate the right area to repaint // when we scroll. // Reparent views on any child frames (or their descendants) to this // view. We can just call ReparentFrameViewTo on this frame because // we know this frame has no view, so it will crawl the children. Also, // we know that any descendants with views must have 'parentView' as their // parent view. ReparentFrameViewTo(aFrame, viewManager, view, parentView); // Remember our view aFrame->SetView(view); NS_FRAME_LOG(NS_FRAME_TRACE_CALLS, ("nsContainerFrame::CreateViewForFrame: frame=%p view=%p", aFrame)); } /** * Position the view associated with |aKidFrame|, if there is one. A * container frame should call this method after positioning a frame, * but before |Reflow|. */ void nsContainerFrame::PositionFrameView(nsIFrame* aKidFrame) { nsIFrame* parentFrame = aKidFrame->GetParent(); if (!aKidFrame->HasView() || !parentFrame) return; nsView* view = aKidFrame->GetView(); nsViewManager* vm = view->GetViewManager(); nsPoint pt; nsView* ancestorView = parentFrame->GetClosestView(&pt); if (ancestorView != view->GetParent()) { NS_ASSERTION(ancestorView == view->GetParent()->GetParent(), "Allowed only one anonymous view between frames"); // parentFrame is responsible for positioning aKidFrame's view // explicitly return; } pt += aKidFrame->GetPosition(); vm->MoveViewTo(view, pt.x, pt.y); } nsresult nsContainerFrame::ReparentFrameView(nsIFrame* aChildFrame, nsIFrame* aOldParentFrame, nsIFrame* aNewParentFrame) { NS_PRECONDITION(aChildFrame, "null child frame pointer"); NS_PRECONDITION(aOldParentFrame, "null old parent frame pointer"); NS_PRECONDITION(aNewParentFrame, "null new parent frame pointer"); NS_PRECONDITION(aOldParentFrame != aNewParentFrame, "same old and new parent frame"); // See if either the old parent frame or the new parent frame have a view while (!aOldParentFrame->HasView() && !aNewParentFrame->HasView()) { // Walk up both the old parent frame and the new parent frame nodes // stopping when we either find a common parent or views for one // or both of the frames. // // This works well in the common case where we push/pull and the old parent // frame and the new parent frame are part of the same flow. They will // typically be the same distance (height wise) from the aOldParentFrame = aOldParentFrame->GetParent(); aNewParentFrame = aNewParentFrame->GetParent(); // We should never walk all the way to the root frame without finding // a view NS_ASSERTION(aOldParentFrame && aNewParentFrame, "didn't find view"); // See if we reached a common ancestor if (aOldParentFrame == aNewParentFrame) { break; } } // See if we found a common parent frame if (aOldParentFrame == aNewParentFrame) { // We found a common parent and there are no views between the old parent // and the common parent or the new parent frame and the common parent. // Because neither the old parent frame nor the new parent frame have views, // then any child views don't need reparenting return NS_OK; } // We found views for one or both of the ancestor frames before we // found a common ancestor. nsView* oldParentView = aOldParentFrame->GetClosestView(); nsView* newParentView = aNewParentFrame->GetClosestView(); // See if the old parent frame and the new parent frame are in the // same view sub-hierarchy. If they are then we don't have to do // anything if (oldParentView != newParentView) { // They're not so we need to reparent any child views return ReparentFrameViewTo(aChildFrame, oldParentView->GetViewManager(), newParentView, oldParentView); } return NS_OK; } nsresult nsContainerFrame::ReparentFrameViewList(const nsFrameList& aChildFrameList, nsIFrame* aOldParentFrame, nsIFrame* aNewParentFrame) { NS_PRECONDITION(aChildFrameList.NotEmpty(), "empty child frame list"); NS_PRECONDITION(aOldParentFrame, "null old parent frame pointer"); NS_PRECONDITION(aNewParentFrame, "null new parent frame pointer"); NS_PRECONDITION(aOldParentFrame != aNewParentFrame, "same old and new parent frame"); // See if either the old parent frame or the new parent frame have a view while (!aOldParentFrame->HasView() && !aNewParentFrame->HasView()) { // Walk up both the old parent frame and the new parent frame nodes // stopping when we either find a common parent or views for one // or both of the frames. // // This works well in the common case where we push/pull and the old parent // frame and the new parent frame are part of the same flow. They will // typically be the same distance (height wise) from the aOldParentFrame = aOldParentFrame->GetParent(); aNewParentFrame = aNewParentFrame->GetParent(); // We should never walk all the way to the root frame without finding // a view NS_ASSERTION(aOldParentFrame && aNewParentFrame, "didn't find view"); // See if we reached a common ancestor if (aOldParentFrame == aNewParentFrame) { break; } } // See if we found a common parent frame if (aOldParentFrame == aNewParentFrame) { // We found a common parent and there are no views between the old parent // and the common parent or the new parent frame and the common parent. // Because neither the old parent frame nor the new parent frame have views, // then any child views don't need reparenting return NS_OK; } // We found views for one or both of the ancestor frames before we // found a common ancestor. nsView* oldParentView = aOldParentFrame->GetClosestView(); nsView* newParentView = aNewParentFrame->GetClosestView(); // See if the old parent frame and the new parent frame are in the // same view sub-hierarchy. If they are then we don't have to do // anything if (oldParentView != newParentView) { nsViewManager* viewManager = oldParentView->GetViewManager(); // They're not so we need to reparent any child views for (nsFrameList::Enumerator e(aChildFrameList); !e.AtEnd(); e.Next()) { ReparentFrameViewTo(e.get(), viewManager, newParentView, oldParentView); } } return NS_OK; } static nsIWidget* GetPresContextContainerWidget(nsPresContext* aPresContext) { nsCOMPtr container = aPresContext->Document()->GetContainer(); nsCOMPtr baseWindow = do_QueryInterface(container); if (!baseWindow) return nullptr; nsCOMPtr mainWidget; baseWindow->GetMainWidget(getter_AddRefs(mainWidget)); return mainWidget; } static bool IsTopLevelWidget(nsIWidget* aWidget) { nsWindowType windowType = aWidget->WindowType(); return windowType == eWindowType_toplevel || windowType == eWindowType_dialog || windowType == eWindowType_sheet; // popups aren't toplevel so they're not handled here } void nsContainerFrame::SyncWindowProperties(nsPresContext* aPresContext, nsIFrame* aFrame, nsView* aView, nsRenderingContext* aRC) { #ifdef MOZ_XUL if (!aView || !nsCSSRendering::IsCanvasFrame(aFrame) || !aView->HasWidget()) return; nsIWidget* windowWidget = GetPresContextContainerWidget(aPresContext); if (!windowWidget || !IsTopLevelWidget(windowWidget)) return; nsViewManager* vm = aView->GetViewManager(); nsView* rootView = vm->GetRootView(); if (aView != rootView) return; Element* rootElement = aPresContext->Document()->GetRootElement(); if (!rootElement || !rootElement->IsXUL()) { // Scrollframes use native widgets which don't work well with // translucent windows, at least in Windows XP. So if the document // has a root scrollrame it's useless to try to make it transparent, // we'll just get something broken. // nsCSSFrameConstructor::ConstructRootFrame constructs root // scrollframes whenever the root element is not a XUL element, so // we test for that here. We can't just call // presShell->GetRootScrollFrame() since that might not have // been constructed yet. // We can change this to allow translucent toplevel HTML documents // (e.g. to do something like Dashboard widgets), once we // have broad support for translucent scrolled documents, but be // careful because apparently some Firefox extensions expect // openDialog("something.html") to produce an opaque window // even if the HTML doesn't have a background-color set. return; } nsIFrame *rootFrame = aPresContext->PresShell()->FrameConstructor()->GetRootElementStyleFrame(); if (!rootFrame) return; nsTransparencyMode mode = nsLayoutUtils::GetFrameTransparency(aFrame, rootFrame); nsIWidget* viewWidget = aView->GetWidget(); viewWidget->SetTransparencyMode(mode); windowWidget->SetWindowShadowStyle(rootFrame->StyleUIReset()->mWindowShadow); if (!aRC) return; nsBoxLayoutState aState(aPresContext, aRC); nsSize minSize = rootFrame->GetMinSize(aState); nsSize maxSize = rootFrame->GetMaxSize(aState); SetSizeConstraints(aPresContext, windowWidget, minSize, maxSize); #endif } void nsContainerFrame::SetSizeConstraints(nsPresContext* aPresContext, nsIWidget* aWidget, const nsSize& aMinSize, const nsSize& aMaxSize) { nsIntSize devMinSize(aPresContext->AppUnitsToDevPixels(aMinSize.width), aPresContext->AppUnitsToDevPixels(aMinSize.height)); nsIntSize devMaxSize(aMaxSize.width == NS_INTRINSICSIZE ? NS_MAXSIZE : aPresContext->AppUnitsToDevPixels(aMaxSize.width), aMaxSize.height == NS_INTRINSICSIZE ? NS_MAXSIZE : aPresContext->AppUnitsToDevPixels(aMaxSize.height)); // MinSize has a priority over MaxSize if (devMinSize.width > devMaxSize.width) devMaxSize.width = devMinSize.width; if (devMinSize.height > devMaxSize.height) devMaxSize.height = devMinSize.height; widget::SizeConstraints constraints(devMinSize, devMaxSize); // The sizes are in inner window sizes, so convert them into outer window sizes. // Use a size of (200, 200) as only the difference between the inner and outer // size is needed. nsIntSize windowSize = aWidget->ClientToWindowSize(nsIntSize(200, 200)); if (constraints.mMinSize.width) constraints.mMinSize.width += windowSize.width - 200; if (constraints.mMinSize.height) constraints.mMinSize.height += windowSize.height - 200; if (constraints.mMaxSize.width != NS_MAXSIZE) constraints.mMaxSize.width += windowSize.width - 200; if (constraints.mMaxSize.height != NS_MAXSIZE) constraints.mMaxSize.height += windowSize.height - 200; aWidget->SetSizeConstraints(constraints); } void nsContainerFrame::SyncFrameViewAfterReflow(nsPresContext* aPresContext, nsIFrame* aFrame, nsView* aView, const nsRect& aVisualOverflowArea, uint32_t aFlags) { if (!aView) { return; } // Make sure the view is sized and positioned correctly if (0 == (aFlags & NS_FRAME_NO_MOVE_VIEW)) { PositionFrameView(aFrame); } if (0 == (aFlags & NS_FRAME_NO_SIZE_VIEW)) { nsViewManager* vm = aView->GetViewManager(); vm->ResizeView(aView, aVisualOverflowArea, true); } } void nsContainerFrame::SyncFrameViewProperties(nsPresContext* aPresContext, nsIFrame* aFrame, nsStyleContext* aStyleContext, nsView* aView, uint32_t aFlags) { NS_ASSERTION(!aStyleContext || aFrame->StyleContext() == aStyleContext, "Wrong style context for frame?"); if (!aView) { return; } nsViewManager* vm = aView->GetViewManager(); if (nullptr == aStyleContext) { aStyleContext = aFrame->StyleContext(); } // Make sure visibility is correct. This only affects nsSubdocumentFrame. if (0 == (aFlags & NS_FRAME_NO_VISIBILITY) && !aFrame->SupportsVisibilityHidden()) { // See if the view should be hidden or visible vm->SetViewVisibility(aView, aStyleContext->StyleVisibility()->IsVisible() ? nsViewVisibility_kShow : nsViewVisibility_kHide); } // See if the frame is being relatively positioned or absolutely // positioned bool isPositioned = aFrame->IsPositioned(); int32_t zIndex = 0; bool autoZIndex = false; if (!isPositioned) { autoZIndex = true; } else { // Make sure z-index is correct const nsStylePosition* position = aStyleContext->StylePosition(); if (position->mZIndex.GetUnit() == eStyleUnit_Integer) { zIndex = position->mZIndex.GetIntValue(); } else if (position->mZIndex.GetUnit() == eStyleUnit_Auto) { autoZIndex = true; } } vm->SetViewZIndex(aView, autoZIndex, zIndex); } static nscoord GetCoord(const nsStyleCoord& aCoord, nscoord aIfNotCoord) { if (aCoord.ConvertsToLength()) { return nsRuleNode::ComputeCoordPercentCalc(aCoord, 0); } return aIfNotCoord; } void nsContainerFrame::DoInlineIntrinsicISize(nsRenderingContext *aRenderingContext, InlineIntrinsicISizeData *aData, nsLayoutUtils::IntrinsicISizeType aType) { if (GetPrevInFlow()) return; // Already added. NS_PRECONDITION(aType == nsLayoutUtils::MIN_ISIZE || aType == nsLayoutUtils::PREF_ISIZE, "bad type"); mozilla::css::Side startSide, endSide; if (StyleVisibility()->mDirection == NS_STYLE_DIRECTION_LTR) { startSide = NS_SIDE_LEFT; endSide = NS_SIDE_RIGHT; } else { startSide = NS_SIDE_RIGHT; endSide = NS_SIDE_LEFT; } const nsStylePadding *stylePadding = StylePadding(); const nsStyleBorder *styleBorder = StyleBorder(); const nsStyleMargin *styleMargin = StyleMargin(); // This goes at the beginning no matter how things are broken and how // messy the bidi situations are, since per CSS2.1 section 8.6 // (implemented in bug 328168), the startSide border is always on the // first line. // This frame is a first-in-flow, but it might have a previous bidi // continuation, in which case that continuation should handle the startSide // border. // For box-decoration-break:clone we setup clonePBM = startPBM + endPBM and // add that to each line. For box-decoration-break:slice clonePBM is zero. nscoord clonePBM = 0; // PBM = PaddingBorderMargin const bool sliceBreak = styleBorder->mBoxDecorationBreak == NS_STYLE_BOX_DECORATION_BREAK_SLICE; if (!GetPrevContinuation()) { nscoord startPBM = // clamp negative calc() to 0 std::max(GetCoord(stylePadding->mPadding.Get(startSide), 0), 0) + styleBorder->GetComputedBorderWidth(startSide) + GetCoord(styleMargin->mMargin.Get(startSide), 0); if (MOZ_LIKELY(sliceBreak)) { aData->currentLine += startPBM; } else { clonePBM = startPBM; } } nscoord endPBM = // clamp negative calc() to 0 std::max(GetCoord(stylePadding->mPadding.Get(endSide), 0), 0) + styleBorder->GetComputedBorderWidth(endSide) + GetCoord(styleMargin->mMargin.Get(endSide), 0); if (MOZ_UNLIKELY(!sliceBreak)) { clonePBM += endPBM; } const nsLineList_iterator* savedLine = aData->line; nsIFrame* const savedLineContainer = aData->lineContainer; nsContainerFrame *lastInFlow; for (nsContainerFrame *nif = this; nif; nif = static_cast(nif->GetNextInFlow())) { if (aData->currentLine == 0) { aData->currentLine = clonePBM; } for (nsIFrame *kid = nif->mFrames.FirstChild(); kid; kid = kid->GetNextSibling()) { if (aType == nsLayoutUtils::MIN_ISIZE) kid->AddInlineMinISize(aRenderingContext, static_cast(aData)); else kid->AddInlinePrefISize(aRenderingContext, static_cast(aData)); } // After we advance to our next-in-flow, the stored line and line container // may no longer be correct. Just forget them. aData->line = nullptr; aData->lineContainer = nullptr; lastInFlow = nif; } aData->line = savedLine; aData->lineContainer = savedLineContainer; // This goes at the end no matter how things are broken and how // messy the bidi situations are, since per CSS2.1 section 8.6 // (implemented in bug 328168), the endSide border is always on the // last line. // We reached the last-in-flow, but it might have a next bidi // continuation, in which case that continuation should handle // the endSide border. if (MOZ_LIKELY(!lastInFlow->GetNextContinuation() && sliceBreak)) { aData->currentLine += endPBM; } } /* virtual */ LogicalSize nsContainerFrame::ComputeAutoSize(nsRenderingContext *aRenderingContext, WritingMode aWM, const LogicalSize& aCBSize, nscoord aAvailableISize, const LogicalSize& aMargin, const LogicalSize& aBorder, const LogicalSize& aPadding, bool aShrinkWrap) { LogicalSize result(aWM, 0xdeadbeef, NS_UNCONSTRAINEDSIZE); nscoord availBased = aAvailableISize - aMargin.ISize(aWM) - aBorder.ISize(aWM) - aPadding.ISize(aWM); // replaced elements always shrink-wrap if (aShrinkWrap || IsFrameOfType(eReplaced)) { // don't bother setting it if the result won't be used const nsStyleCoord& inlineStyleCoord = aWM.IsVertical() ? StylePosition()->mHeight : StylePosition()->mWidth; if (inlineStyleCoord.GetUnit() == eStyleUnit_Auto) { result.ISize(aWM) = ShrinkWidthToFit(aRenderingContext, availBased); } } else { result.ISize(aWM) = availBased; } return result; } /** * Invokes the WillReflow() function, positions the frame and its view (if * requested), and then calls Reflow(). If the reflow succeeds and the child * frame is complete, deletes any next-in-flows using DeleteNextInFlowChild() */ void nsContainerFrame::ReflowChild(nsIFrame* aKidFrame, nsPresContext* aPresContext, nsHTMLReflowMetrics& aDesiredSize, const nsHTMLReflowState& aReflowState, nscoord aX, nscoord aY, uint32_t aFlags, nsReflowStatus& aStatus, nsOverflowContinuationTracker* aTracker) { NS_PRECONDITION(aReflowState.frame == aKidFrame, "bad reflow state"); // Send the WillReflow() notification, and position the child frame // and its view if requested aKidFrame->WillReflow(aPresContext); if (NS_FRAME_NO_MOVE_FRAME != (aFlags & NS_FRAME_NO_MOVE_FRAME)) { aKidFrame->SetPosition(nsPoint(aX, aY)); } if (0 == (aFlags & NS_FRAME_NO_MOVE_VIEW)) { PositionFrameView(aKidFrame); } // Reflow the child frame aKidFrame->Reflow(aPresContext, aDesiredSize, aReflowState, aStatus); // If the child frame is complete, delete any next-in-flows, // but only if the NO_DELETE_NEXT_IN_FLOW flag isn't set. if (NS_FRAME_IS_FULLY_COMPLETE(aStatus) && !(aFlags & NS_FRAME_NO_DELETE_NEXT_IN_FLOW_CHILD)) { nsIFrame* kidNextInFlow = aKidFrame->GetNextInFlow(); if (kidNextInFlow) { // Remove all of the childs next-in-flows. Make sure that we ask // the right parent to do the removal (it's possible that the // parent is not this because we are executing pullup code) nsOverflowContinuationTracker::AutoFinish fini(aTracker, aKidFrame); kidNextInFlow->GetParent()->DeleteNextInFlowChild(kidNextInFlow, true); } } } /** * Position the views of |aFrame|'s descendants. A container frame * should call this method if it moves a frame after |Reflow|. */ void nsContainerFrame::PositionChildViews(nsIFrame* aFrame) { if (!(aFrame->GetStateBits() & NS_FRAME_HAS_CHILD_WITH_VIEW)) { return; } // Recursively walk aFrame's child frames. // Process the additional child lists, but skip the popup list as the // view for popups is managed by the parent. Currently only nsMenuFrame // and nsPopupSetFrame have a popupList and during layout will adjust the // view manually to position the popup. ChildListIterator lists(aFrame); for (; !lists.IsDone(); lists.Next()) { if (lists.CurrentID() == kPopupList) { continue; } nsFrameList::Enumerator childFrames(lists.CurrentList()); for (; !childFrames.AtEnd(); childFrames.Next()) { // Position the frame's view (if it has one) otherwise recursively // process its children nsIFrame* childFrame = childFrames.get(); if (childFrame->HasView()) { PositionFrameView(childFrame); } else { PositionChildViews(childFrame); } } } } /** * The second half of frame reflow. Does the following: * - sets the frame's bounds * - sizes and positions (if requested) the frame's view. If the frame's final * position differs from the current position and the frame itself does not * have a view, then any child frames with views are positioned so they stay * in sync * - sets the view's visibility, opacity, content transparency, and clip * - invoked the DidReflow() function * * Flags: * NS_FRAME_NO_MOVE_FRAME - don't move the frame. aX and aY are ignored in this * case. Also implies NS_FRAME_NO_MOVE_VIEW * NS_FRAME_NO_MOVE_VIEW - don't position the frame's view. Set this if you * don't want to automatically sync the frame and view * NS_FRAME_NO_SIZE_VIEW - don't size the frame's view */ void nsContainerFrame::FinishReflowChild(nsIFrame* aKidFrame, nsPresContext* aPresContext, const nsHTMLReflowMetrics& aDesiredSize, const nsHTMLReflowState* aReflowState, nscoord aX, nscoord aY, uint32_t aFlags) { nsPoint curOrigin = aKidFrame->GetPosition(); if (NS_FRAME_NO_MOVE_FRAME != (aFlags & NS_FRAME_NO_MOVE_FRAME)) { aKidFrame->SetRect(nsRect(aX, aY, aDesiredSize.Width(), aDesiredSize.Height())); } else { aKidFrame->SetSize(nsSize(aDesiredSize.Width(), aDesiredSize.Height())); } if (aKidFrame->HasView()) { nsView* view = aKidFrame->GetView(); // Make sure the frame's view is properly sized and positioned and has // things like opacity correct SyncFrameViewAfterReflow(aPresContext, aKidFrame, view, aDesiredSize.VisualOverflow(), aFlags); } if (!(aFlags & NS_FRAME_NO_MOVE_VIEW) && (curOrigin.x != aX || curOrigin.y != aY)) { if (!aKidFrame->HasView()) { // If the frame has moved, then we need to make sure any child views are // correctly positioned PositionChildViews(aKidFrame); } } aKidFrame->DidReflow(aPresContext, aReflowState, nsDidReflowStatus::FINISHED); } void nsContainerFrame::ReflowOverflowContainerChildren(nsPresContext* aPresContext, const nsHTMLReflowState& aReflowState, nsOverflowAreas& aOverflowRects, uint32_t aFlags, nsReflowStatus& aStatus) { NS_PRECONDITION(aPresContext, "null pointer"); nsFrameList* overflowContainers = GetPropTableFrames(OverflowContainersProperty()); NS_ASSERTION(!(overflowContainers && GetPrevInFlow() && static_cast(GetPrevInFlow()) ->GetPropTableFrames(ExcessOverflowContainersProperty())), "conflicting overflow containers lists"); if (!overflowContainers) { // Drain excess from previnflow nsContainerFrame* prev = (nsContainerFrame*) GetPrevInFlow(); if (prev) { nsFrameList* excessFrames = prev->RemovePropTableFrames(ExcessOverflowContainersProperty()); if (excessFrames) { excessFrames->ApplySetParent(this); nsContainerFrame::ReparentFrameViewList(*excessFrames, prev, this); overflowContainers = excessFrames; SetPropTableFrames(overflowContainers, OverflowContainersProperty()); } } } // Our own excess overflow containers from a previous reflow can still be // present if our next-in-flow hasn't been reflown yet. nsFrameList* selfExcessOCFrames = RemovePropTableFrames(ExcessOverflowContainersProperty()); if (selfExcessOCFrames) { if (overflowContainers) { overflowContainers->AppendFrames(nullptr, *selfExcessOCFrames); selfExcessOCFrames->Delete(aPresContext->PresShell()); } else { overflowContainers = selfExcessOCFrames; SetPropTableFrames(overflowContainers, OverflowContainersProperty()); } } if (!overflowContainers) { return; // nothing to reflow } nsOverflowContinuationTracker tracker(this, false, false); bool shouldReflowAllKids = aReflowState.ShouldReflowAllKids(); for (nsIFrame* frame = overflowContainers->FirstChild(); frame; frame = frame->GetNextSibling()) { if (frame->GetPrevInFlow()->GetParent() != GetPrevInFlow()) { // frame's prevInFlow has moved, skip reflowing this frame; // it will get reflowed once it's been placed continue; } // If the available vertical height has changed, we need to reflow // even if the frame isn't dirty. if (shouldReflowAllKids || NS_SUBTREE_DIRTY(frame)) { // Get prev-in-flow nsIFrame* prevInFlow = frame->GetPrevInFlow(); NS_ASSERTION(prevInFlow, "overflow container frame must have a prev-in-flow"); NS_ASSERTION(frame->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER, "overflow container frame must have overflow container bit set"); nsRect prevRect = prevInFlow->GetRect(); // Initialize reflow params WritingMode wm = frame->GetWritingMode(); LogicalSize availSpace(wm, LogicalSize(wm, prevRect.Size()).ISize(wm), aReflowState.AvailableSize(wm).BSize(wm)); nsHTMLReflowMetrics desiredSize(aReflowState); nsHTMLReflowState frameState(aPresContext, aReflowState, frame, availSpace); nsReflowStatus frameStatus; // Reflow ReflowChild(frame, aPresContext, desiredSize, frameState, prevRect.x, 0, aFlags, frameStatus, &tracker); //XXXfr Do we need to override any shrinkwrap effects here? // e.g. desiredSize.Width() = prevRect.width; FinishReflowChild(frame, aPresContext, desiredSize, &frameState, prevRect.x, 0, aFlags); // Handle continuations if (!NS_FRAME_IS_FULLY_COMPLETE(frameStatus)) { if (frame->GetStateBits() & NS_FRAME_OUT_OF_FLOW) { // Abspos frames can't cause their parent to be incomplete, // only overflow incomplete. NS_FRAME_SET_OVERFLOW_INCOMPLETE(frameStatus); } else { NS_ASSERTION(NS_FRAME_IS_COMPLETE(frameStatus), "overflow container frames can't be incomplete, only overflow-incomplete"); } // Acquire a next-in-flow, creating it if necessary nsIFrame* nif = frame->GetNextInFlow(); if (!nif) { NS_ASSERTION(frameStatus & NS_FRAME_REFLOW_NEXTINFLOW, "Someone forgot a REFLOW_NEXTINFLOW flag"); nif = aPresContext->PresShell()->FrameConstructor()-> CreateContinuingFrame(aPresContext, frame, this); } else if (!(nif->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER)) { // used to be a normal next-in-flow; steal it from the child list nsresult rv = nif->GetParent()->StealFrame(nif); if (NS_FAILED(rv)) { return; } } tracker.Insert(nif, frameStatus); } NS_MergeReflowStatusInto(&aStatus, frameStatus); // At this point it would be nice to assert !frame->GetOverflowRect().IsEmpty(), // but we have some unsplittable frames that, when taller than // availableHeight will push zero-height content into a next-in-flow. } else { tracker.Skip(frame, aStatus); if (aReflowState.mFloatManager) { nsBlockFrame::RecoverFloatsFor(frame, *aReflowState.mFloatManager, aReflowState.GetWritingMode(), aReflowState.ComputedWidth()); } } ConsiderChildOverflow(aOverflowRects, frame); } } void nsContainerFrame::DisplayOverflowContainers(nsDisplayListBuilder* aBuilder, const nsRect& aDirtyRect, const nsDisplayListSet& aLists) { nsFrameList* overflowconts = GetPropTableFrames(OverflowContainersProperty()); if (overflowconts) { for (nsIFrame* frame = overflowconts->FirstChild(); frame; frame = frame->GetNextSibling()) { BuildDisplayListForChild(aBuilder, frame, aDirtyRect, aLists); } } } static bool TryRemoveFrame(nsIFrame* aFrame, FramePropertyTable* aPropTable, const FramePropertyDescriptor* aProp, nsIFrame* aChildToRemove) { nsFrameList* list = static_cast(aPropTable->Get(aFrame, aProp)); if (list && list->StartRemoveFrame(aChildToRemove)) { // aChildToRemove *may* have been removed from this list. if (list->IsEmpty()) { aPropTable->Remove(aFrame, aProp); list->Delete(aFrame->PresContext()->PresShell()); } return true; } return false; } nsresult nsContainerFrame::StealFrame(nsIFrame* aChild, bool aForceNormal) { #ifdef DEBUG if (!mFrames.ContainsFrame(aChild)) { nsFrameList* list = GetOverflowFrames(); if (!list || !list->ContainsFrame(aChild)) { FramePropertyTable* propTable = PresContext()->PropertyTable(); list = static_cast( propTable->Get(this, OverflowContainersProperty())); if (!list || !list->ContainsFrame(aChild)) { list = static_cast( propTable->Get(this, ExcessOverflowContainersProperty())); MOZ_ASSERT(list && list->ContainsFrame(aChild), "aChild isn't our child" " or on a frame list not supported by StealFrame"); } } } #endif bool removed; if ((aChild->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER) && !aForceNormal) { FramePropertyTable* propTable = PresContext()->PropertyTable(); // Try removing from the overflow container list. removed = ::TryRemoveFrame(this, propTable, OverflowContainersProperty(), aChild); if (!removed) { // It must be in the excess overflow container list. removed = ::TryRemoveFrame(this, propTable, ExcessOverflowContainersProperty(), aChild); } } else { removed = mFrames.StartRemoveFrame(aChild); if (!removed) { // We didn't find the child in our principal child list. // Maybe it's on the overflow list? nsFrameList* frameList = GetOverflowFrames(); if (frameList) { removed = frameList->ContinueRemoveFrame(aChild); if (frameList->IsEmpty()) { DestroyOverflowList(); } } } } NS_POSTCONDITION(removed, "StealFrame: can't find aChild"); return removed ? NS_OK : NS_ERROR_UNEXPECTED; } nsFrameList nsContainerFrame::StealFramesAfter(nsIFrame* aChild) { NS_ASSERTION(!aChild || !(aChild->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER), "StealFramesAfter doesn't handle overflow containers"); NS_ASSERTION(GetType() != nsGkAtoms::blockFrame, "unexpected call"); if (!aChild) { nsFrameList copy(mFrames); mFrames.Clear(); return copy; } for (nsFrameList::FrameLinkEnumerator iter(mFrames); !iter.AtEnd(); iter.Next()) { if (iter.PrevFrame() == aChild) { return mFrames.ExtractTail(iter); } } // We didn't find the child in the principal child list. // Maybe it's on the overflow list? nsFrameList* overflowFrames = GetOverflowFrames(); if (overflowFrames) { for (nsFrameList::FrameLinkEnumerator iter(*overflowFrames); !iter.AtEnd(); iter.Next()) { if (iter.PrevFrame() == aChild) { return overflowFrames->ExtractTail(iter); } } } NS_ERROR("StealFramesAfter: can't find aChild"); return nsFrameList::EmptyList(); } /* * Create a next-in-flow for aFrame. Will return the newly created * frame in aNextInFlowResult if and only if a new frame is * created; otherwise nullptr is returned in aNextInFlowResult. */ nsresult nsContainerFrame::CreateNextInFlow(nsIFrame* aFrame, nsIFrame*& aNextInFlowResult) { NS_PRECONDITION(GetType() != nsGkAtoms::blockFrame, "you should have called nsBlockFrame::CreateContinuationFor instead"); NS_PRECONDITION(mFrames.ContainsFrame(aFrame), "expected an in-flow child frame"); nsPresContext* pc = PresContext(); aNextInFlowResult = nullptr; nsIFrame* nextInFlow = aFrame->GetNextInFlow(); if (nullptr == nextInFlow) { // Create a continuation frame for the child frame and insert it // into our child list. nextInFlow = pc->PresShell()->FrameConstructor()-> CreateContinuingFrame(pc, aFrame, this); mFrames.InsertFrame(nullptr, aFrame, nextInFlow); NS_FRAME_LOG(NS_FRAME_TRACE_NEW_FRAMES, ("nsContainerFrame::CreateNextInFlow: frame=%p nextInFlow=%p", aFrame, nextInFlow)); aNextInFlowResult = nextInFlow; } return NS_OK; } /** * Remove and delete aNextInFlow and its next-in-flows. Updates the sibling and flow * pointers */ void nsContainerFrame::DeleteNextInFlowChild(nsIFrame* aNextInFlow, bool aDeletingEmptyFrames) { #ifdef DEBUG nsIFrame* prevInFlow = aNextInFlow->GetPrevInFlow(); #endif NS_PRECONDITION(prevInFlow, "bad prev-in-flow"); // If the next-in-flow has a next-in-flow then delete it, too (and // delete it first). // Do this in a loop so we don't overflow the stack for frames // with very many next-in-flows nsIFrame* nextNextInFlow = aNextInFlow->GetNextInFlow(); if (nextNextInFlow) { nsAutoTArray frames; for (nsIFrame* f = nextNextInFlow; f; f = f->GetNextInFlow()) { frames.AppendElement(f); } for (int32_t i = frames.Length() - 1; i >= 0; --i) { nsIFrame* delFrame = frames.ElementAt(i); delFrame->GetParent()-> DeleteNextInFlowChild(delFrame, aDeletingEmptyFrames); } } // Take the next-in-flow out of the parent's child list DebugOnly rv = StealFrame(aNextInFlow); NS_ASSERTION(NS_SUCCEEDED(rv), "StealFrame failure"); #ifdef DEBUG if (aDeletingEmptyFrames) { nsLayoutUtils::AssertTreeOnlyEmptyNextInFlows(aNextInFlow); } #endif // Delete the next-in-flow frame and its descendants. This will also // remove it from its next-in-flow/prev-in-flow chain. aNextInFlow->Destroy(); NS_POSTCONDITION(!prevInFlow->GetNextInFlow(), "non null next-in-flow"); } /** * Set the frames on the overflow list */ void nsContainerFrame::SetOverflowFrames(const nsFrameList& aOverflowFrames) { NS_PRECONDITION(aOverflowFrames.NotEmpty(), "Shouldn't be called"); nsPresContext* pc = PresContext(); nsFrameList* newList = new (pc->PresShell()) nsFrameList(aOverflowFrames); pc->PropertyTable()->Set(this, OverflowProperty(), newList); } nsFrameList* nsContainerFrame::GetPropTableFrames(const FramePropertyDescriptor* aProperty) const { FramePropertyTable* propTable = PresContext()->PropertyTable(); return static_cast(propTable->Get(this, aProperty)); } nsFrameList* nsContainerFrame::RemovePropTableFrames(const FramePropertyDescriptor* aProperty) { FramePropertyTable* propTable = PresContext()->PropertyTable(); return static_cast(propTable->Remove(this, aProperty)); } void nsContainerFrame::SetPropTableFrames(nsFrameList* aFrameList, const FramePropertyDescriptor* aProperty) { NS_PRECONDITION(aProperty && aFrameList, "null ptr"); NS_PRECONDITION( (aProperty != nsContainerFrame::OverflowContainersProperty() && aProperty != nsContainerFrame::ExcessOverflowContainersProperty()) || IsFrameOfType(nsIFrame::eCanContainOverflowContainers), "this type of frame can't have overflow containers"); MOZ_ASSERT(!GetPropTableFrames(aProperty)); PresContext()->PropertyTable()->Set(this, aProperty, aFrameList); } /** * Push aFromChild and its next siblings to the next-in-flow. Change the * geometric parent of each frame that's pushed. If there is no next-in-flow * the frames are placed on the overflow list (and the geometric parent is * left unchanged). * * Updates the next-in-flow's child count. Does not update the * pusher's child count. * * @param aFromChild the first child frame to push. It is disconnected from * aPrevSibling * @param aPrevSibling aFromChild's previous sibling. Must not be null. It's * an error to push a parent's first child frame */ void nsContainerFrame::PushChildren(nsIFrame* aFromChild, nsIFrame* aPrevSibling) { NS_PRECONDITION(aFromChild, "null pointer"); NS_PRECONDITION(aPrevSibling, "pushing first child"); NS_PRECONDITION(aPrevSibling->GetNextSibling() == aFromChild, "bad prev sibling"); // Disconnect aFromChild from its previous sibling nsFrameList tail = mFrames.RemoveFramesAfter(aPrevSibling); nsContainerFrame* nextInFlow = static_cast(GetNextInFlow()); if (nextInFlow) { // XXX This is not a very good thing to do. If it gets removed // then remove the copy of this routine that doesn't do this from // nsInlineFrame. // When pushing and pulling frames we need to check for whether any // views need to be reparented. for (nsIFrame* f = aFromChild; f; f = f->GetNextSibling()) { nsContainerFrame::ReparentFrameView(f, this, nextInFlow); } nextInFlow->mFrames.InsertFrames(nextInFlow, nullptr, tail); } else { // Add the frames to our overflow list SetOverflowFrames(tail); } } /** * Moves any frames on the overflow lists (the prev-in-flow's overflow list and * the receiver's overflow list) to the child list. * * Updates this frame's child count and content mapping. * * @return true if any frames were moved and false otherwise */ bool nsContainerFrame::MoveOverflowToChildList() { bool result = false; // Check for an overflow list with our prev-in-flow nsContainerFrame* prevInFlow = (nsContainerFrame*)GetPrevInFlow(); if (nullptr != prevInFlow) { AutoFrameListPtr prevOverflowFrames(PresContext(), prevInFlow->StealOverflowFrames()); if (prevOverflowFrames) { // Tables are special; they can have repeated header/footer // frames on mFrames at this point. NS_ASSERTION(mFrames.IsEmpty() || GetType() == nsGkAtoms::tableFrame, "bad overflow list"); // When pushing and pulling frames we need to check for whether any // views need to be reparented. nsContainerFrame::ReparentFrameViewList(*prevOverflowFrames, prevInFlow, this); mFrames.AppendFrames(this, *prevOverflowFrames); result = true; } } // It's also possible that we have an overflow list for ourselves. return DrainSelfOverflowList() || result; } bool nsContainerFrame::DrainSelfOverflowList() { AutoFrameListPtr overflowFrames(PresContext(), StealOverflowFrames()); if (overflowFrames) { NS_ASSERTION(mFrames.NotEmpty(), "overflow list w/o frames"); mFrames.AppendFrames(nullptr, *overflowFrames); return true; } return false; } nsOverflowContinuationTracker::nsOverflowContinuationTracker(nsContainerFrame* aFrame, bool aWalkOOFFrames, bool aSkipOverflowContainerChildren) : mOverflowContList(nullptr), mPrevOverflowCont(nullptr), mSentry(nullptr), mParent(aFrame), mSkipOverflowContainerChildren(aSkipOverflowContainerChildren), mWalkOOFFrames(aWalkOOFFrames) { NS_PRECONDITION(aFrame, "null frame pointer"); SetupOverflowContList(); } void nsOverflowContinuationTracker::SetupOverflowContList() { NS_PRECONDITION(mParent, "null frame pointer"); NS_PRECONDITION(!mOverflowContList, "already have list"); nsContainerFrame* nif = static_cast(mParent->GetNextInFlow()); if (nif) { mOverflowContList = nif->GetPropTableFrames( nsContainerFrame::OverflowContainersProperty()); if (mOverflowContList) { mParent = nif; SetUpListWalker(); } } if (!mOverflowContList) { mOverflowContList = mParent->GetPropTableFrames( nsContainerFrame::ExcessOverflowContainersProperty()); if (mOverflowContList) { SetUpListWalker(); } } } /** * Helper function to walk past overflow continuations whose prev-in-flow * isn't a normal child and to set mSentry and mPrevOverflowCont correctly. */ void nsOverflowContinuationTracker::SetUpListWalker() { NS_ASSERTION(!mSentry && !mPrevOverflowCont, "forgot to reset mSentry or mPrevOverflowCont"); if (mOverflowContList) { nsIFrame* cur = mOverflowContList->FirstChild(); if (mSkipOverflowContainerChildren) { while (cur && (cur->GetPrevInFlow()->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER)) { mPrevOverflowCont = cur; cur = cur->GetNextSibling(); } while (cur && (!(cur->GetStateBits() & NS_FRAME_OUT_OF_FLOW) == mWalkOOFFrames)) { mPrevOverflowCont = cur; cur = cur->GetNextSibling(); } } if (cur) { mSentry = cur->GetPrevInFlow(); } } } /** * Helper function to step forward through the overflow continuations list. * Sets mSentry and mPrevOverflowCont, skipping over OOF or non-OOF frames * as appropriate. May only be called when we have already set up an * mOverflowContList; mOverflowContList cannot be null. */ void nsOverflowContinuationTracker::StepForward() { NS_PRECONDITION(mOverflowContList, "null list"); // Step forward if (mPrevOverflowCont) { mPrevOverflowCont = mPrevOverflowCont->GetNextSibling(); } else { mPrevOverflowCont = mOverflowContList->FirstChild(); } // Skip over oof or non-oof frames as appropriate if (mSkipOverflowContainerChildren) { nsIFrame* cur = mPrevOverflowCont->GetNextSibling(); while (cur && (!(cur->GetStateBits() & NS_FRAME_OUT_OF_FLOW) == mWalkOOFFrames)) { mPrevOverflowCont = cur; cur = cur->GetNextSibling(); } } // Set up the sentry mSentry = (mPrevOverflowCont->GetNextSibling()) ? mPrevOverflowCont->GetNextSibling()->GetPrevInFlow() : nullptr; } nsresult nsOverflowContinuationTracker::Insert(nsIFrame* aOverflowCont, nsReflowStatus& aReflowStatus) { NS_PRECONDITION(aOverflowCont, "null frame pointer"); NS_PRECONDITION(!mSkipOverflowContainerChildren || mWalkOOFFrames == !!(aOverflowCont->GetStateBits() & NS_FRAME_OUT_OF_FLOW), "shouldn't insert frame that doesn't match walker type"); NS_PRECONDITION(aOverflowCont->GetPrevInFlow(), "overflow containers must have a prev-in-flow"); nsresult rv = NS_OK; bool reparented = false; nsPresContext* presContext = aOverflowCont->PresContext(); bool addToList = !mSentry || aOverflowCont != mSentry->GetNextInFlow(); // If we have a list and aOverflowCont is already in it then don't try to // add it again. if (addToList && aOverflowCont->GetParent() == mParent && (aOverflowCont->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER) && mOverflowContList && mOverflowContList->ContainsFrame(aOverflowCont)) { addToList = false; mPrevOverflowCont = aOverflowCont->GetPrevSibling(); } if (addToList) { if (aOverflowCont->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER) { // aOverflowCont is in some other overflow container list, // steal it first NS_ASSERTION(!(mOverflowContList && mOverflowContList->ContainsFrame(aOverflowCont)), "overflow containers out of order"); rv = aOverflowCont->GetParent()->StealFrame(aOverflowCont); NS_ENSURE_SUCCESS(rv, rv); } else { aOverflowCont->AddStateBits(NS_FRAME_IS_OVERFLOW_CONTAINER); } if (!mOverflowContList) { mOverflowContList = new (presContext->PresShell()) nsFrameList(); mParent->SetPropTableFrames(mOverflowContList, nsContainerFrame::ExcessOverflowContainersProperty()); SetUpListWalker(); } if (aOverflowCont->GetParent() != mParent) { nsContainerFrame::ReparentFrameView(aOverflowCont, aOverflowCont->GetParent(), mParent); reparented = true; } // If aOverflowCont has a prev/next-in-flow that might be in // mOverflowContList we need to find it and insert after/before it to // maintain the order amongst next-in-flows in this list. nsIFrame* pif = aOverflowCont->GetPrevInFlow(); nsIFrame* nif = aOverflowCont->GetNextInFlow(); if ((pif && pif->GetParent() == mParent && pif != mPrevOverflowCont) || (nif && nif->GetParent() == mParent && mPrevOverflowCont)) { for (nsFrameList::Enumerator e(*mOverflowContList); !e.AtEnd(); e.Next()) { nsIFrame* f = e.get(); if (f == pif) { mPrevOverflowCont = pif; break; } if (f == nif) { mPrevOverflowCont = f->GetPrevSibling(); break; } } } mOverflowContList->InsertFrame(mParent, mPrevOverflowCont, aOverflowCont); aReflowStatus |= NS_FRAME_REFLOW_NEXTINFLOW; } // If we need to reflow it, mark it dirty if (aReflowStatus & NS_FRAME_REFLOW_NEXTINFLOW) aOverflowCont->AddStateBits(NS_FRAME_IS_DIRTY); // It's in our list, just step forward StepForward(); NS_ASSERTION(mPrevOverflowCont == aOverflowCont || (mSkipOverflowContainerChildren && (mPrevOverflowCont->GetStateBits() & NS_FRAME_OUT_OF_FLOW) != (aOverflowCont->GetStateBits() & NS_FRAME_OUT_OF_FLOW)), "OverflowContTracker in unexpected state"); if (addToList) { // Convert all non-overflow-container continuations of aOverflowCont // into overflow containers and move them to our overflow // tracker. This preserves the invariant that the next-continuations // of an overflow container are also overflow containers. nsIFrame* f = aOverflowCont->GetNextContinuation(); if (f && (!(f->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER) || (!reparented && f->GetParent() == mParent) || (reparented && f->GetParent() != mParent))) { if (!(f->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER)) { rv = f->GetParent()->StealFrame(f); NS_ENSURE_SUCCESS(rv, rv); } Insert(f, aReflowStatus); } } return rv; } void nsOverflowContinuationTracker::BeginFinish(nsIFrame* aChild) { NS_PRECONDITION(aChild, "null ptr"); NS_PRECONDITION(aChild->GetNextInFlow(), "supposed to call Finish *before* deleting next-in-flow!"); for (nsIFrame* f = aChild; f; f = f->GetNextInFlow()) { // We'll update these in EndFinish after the next-in-flows are gone. if (f == mPrevOverflowCont) { mSentry = nullptr; mPrevOverflowCont = nullptr; break; } if (f == mSentry) { mSentry = nullptr; break; } } } void nsOverflowContinuationTracker::EndFinish(nsIFrame* aChild) { if (!mOverflowContList) { return; } // Forget mOverflowContList if it was deleted. nsPresContext* pc = aChild->PresContext(); FramePropertyTable* propTable = pc->PropertyTable(); nsFrameList* eoc = static_cast(propTable->Get(mParent, nsContainerFrame::ExcessOverflowContainersProperty())); if (eoc != mOverflowContList) { nsFrameList* oc = static_cast(propTable->Get(mParent, nsContainerFrame::OverflowContainersProperty())); if (oc != mOverflowContList) { // mOverflowContList was deleted mPrevOverflowCont = nullptr; mSentry = nullptr; mParent = aChild->GetParent(); mOverflowContList = nullptr; SetupOverflowContList(); return; } } // The list survived, update mSentry if needed. if (!mSentry) { if (!mPrevOverflowCont) { SetUpListWalker(); } else { mozilla::AutoRestore saved(mPrevOverflowCont); // step backward to make StepForward() use our current mPrevOverflowCont mPrevOverflowCont = mPrevOverflowCont->GetPrevSibling(); StepForward(); } } } ///////////////////////////////////////////////////////////////////////////// // Debugging #ifdef DEBUG_FRAME_DUMP void nsContainerFrame::List(FILE* out, const char* aPrefix, uint32_t aFlags) const { nsCString str; ListGeneric(str, aPrefix, aFlags); // Output the children bool outputOneList = false; ChildListIterator lists(this); for (; !lists.IsDone(); lists.Next()) { if (outputOneList) { str += aPrefix; } if (lists.CurrentID() != kPrincipalList) { if (!outputOneList) { str += "\n"; str += aPrefix; } str += nsPrintfCString("%s %p ", mozilla::layout::ChildListName(lists.CurrentID()), &GetChildList(lists.CurrentID())); } fprintf_stderr(out, "%s<\n", str.get()); str = ""; nsFrameList::Enumerator childFrames(lists.CurrentList()); for (; !childFrames.AtEnd(); childFrames.Next()) { nsIFrame* kid = childFrames.get(); // Verify the child frame's parent frame pointer is correct NS_ASSERTION(kid->GetParent() == this, "bad parent frame pointer"); // Have the child frame list nsCString pfx(aPrefix); pfx += " "; kid->List(out, pfx.get(), aFlags); } fprintf_stderr(out, "%s>\n", aPrefix); outputOneList = true; } if (!outputOneList) { fprintf_stderr(out, "%s<>\n", str.get()); } } #endif