/* -*- 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/. */ /* rendering object for CSS display:inline objects */ #include "nsInlineFrame.h" #include "nsLineLayout.h" #include "nsBlockFrame.h" #include "nsPlaceholderFrame.h" #include "nsGkAtoms.h" #include "nsStyleContext.h" #include "nsPresContext.h" #include "nsRenderingContext.h" #include "nsCSSAnonBoxes.h" #include "nsAutoPtr.h" #include "RestyleManager.h" #include "nsDisplayList.h" #include "mozilla/Likely.h" #ifdef DEBUG #undef NOISY_PUSHING #endif using namespace mozilla; using namespace mozilla::layout; ////////////////////////////////////////////////////////////////////// // Basic nsInlineFrame methods nsIFrame* NS_NewInlineFrame(nsIPresShell* aPresShell, nsStyleContext* aContext) { return new (aPresShell) nsInlineFrame(aContext); } NS_IMPL_FRAMEARENA_HELPERS(nsInlineFrame) NS_QUERYFRAME_HEAD(nsInlineFrame) NS_QUERYFRAME_ENTRY(nsInlineFrame) NS_QUERYFRAME_TAIL_INHERITING(nsContainerFrame) #ifdef DEBUG NS_IMETHODIMP nsInlineFrame::GetFrameName(nsAString& aResult) const { return MakeFrameName(NS_LITERAL_STRING("Inline"), aResult); } #endif nsIAtom* nsInlineFrame::GetType() const { return nsGkAtoms::inlineFrame; } void nsInlineFrame::InvalidateFrame(uint32_t aDisplayItemKey) { if (IsSVGText()) { nsIFrame* svgTextFrame = nsLayoutUtils::GetClosestFrameOfType(GetParent(), nsGkAtoms::svgTextFrame2); svgTextFrame->InvalidateFrame(); return; } nsInlineFrameBase::InvalidateFrame(aDisplayItemKey); } void nsInlineFrame::InvalidateFrameWithRect(const nsRect& aRect, uint32_t aDisplayItemKey) { if (IsSVGText()) { nsIFrame* svgTextFrame = nsLayoutUtils::GetClosestFrameOfType(GetParent(), nsGkAtoms::svgTextFrame2); svgTextFrame->InvalidateFrame(); return; } nsInlineFrameBase::InvalidateFrameWithRect(aRect, aDisplayItemKey); } static inline bool IsMarginZero(const nsStyleCoord &aCoord) { return aCoord.GetUnit() == eStyleUnit_Auto || nsLayoutUtils::IsMarginZero(aCoord); } /* virtual */ bool nsInlineFrame::IsSelfEmpty() { #if 0 // I used to think inline frames worked this way, but it seems they // don't. At least not in our codebase. if (GetPresContext()->CompatibilityMode() == eCompatibility_FullStandards) { return false; } #endif const nsStyleMargin* margin = StyleMargin(); const nsStyleBorder* border = StyleBorder(); const nsStylePadding* padding = StylePadding(); // XXX Top and bottom removed, since they shouldn't affect things, but this // doesn't really match with nsLineLayout.cpp's setting of // ZeroEffectiveSpanBox, anymore, so what should this really be? bool haveRight = border->GetComputedBorderWidth(NS_SIDE_RIGHT) != 0 || !nsLayoutUtils::IsPaddingZero(padding->mPadding.GetRight()) || !IsMarginZero(margin->mMargin.GetRight()); bool haveLeft = border->GetComputedBorderWidth(NS_SIDE_LEFT) != 0 || !nsLayoutUtils::IsPaddingZero(padding->mPadding.GetLeft()) || !IsMarginZero(margin->mMargin.GetLeft()); if (haveLeft || haveRight) { if (GetStateBits() & NS_FRAME_IS_SPECIAL) { bool haveStart, haveEnd; if (NS_STYLE_DIRECTION_LTR == StyleVisibility()->mDirection) { haveStart = haveLeft; haveEnd = haveRight; } else { haveStart = haveRight; haveEnd = haveLeft; } // For special frames, ignore things we know we'll skip in GetSkipSides. // XXXbz should we be doing this for non-special frames too, in a more // general way? // Get the first continuation eagerly, as a performance optimization, to // avoid having to get it twice.. nsIFrame* firstCont = FirstContinuation(); return (!haveStart || firstCont->FrameIsNonFirstInIBSplit()) && (!haveEnd || firstCont->FrameIsNonLastInIBSplit()); } return false; } return true; } bool nsInlineFrame::IsEmpty() { if (!IsSelfEmpty()) { return false; } for (nsIFrame *kid = mFrames.FirstChild(); kid; kid = kid->GetNextSibling()) { if (!kid->IsEmpty()) return false; } return true; } bool nsInlineFrame::PeekOffsetCharacter(bool aForward, int32_t* aOffset, bool aRespectClusters) { // Override the implementation in nsFrame, to skip empty inline frames NS_ASSERTION (aOffset && *aOffset <= 1, "aOffset out of range"); int32_t startOffset = *aOffset; if (startOffset < 0) startOffset = 1; if (aForward == (startOffset == 0)) { // We're before the frame and moving forward, or after it and moving backwards: // skip to the other side, but keep going. *aOffset = 1 - startOffset; } return false; } void nsInlineFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder, const nsRect& aDirtyRect, const nsDisplayListSet& aLists) { BuildDisplayListForInline(aBuilder, aDirtyRect, aLists); // The sole purpose of this is to trigger display of the selection // window for Named Anchors, which don't have any children and // normally don't have any size, but in Editor we use CSS to display // an image to represent this "hidden" element. if (!mFrames.FirstChild()) { DisplaySelectionOverlay(aBuilder, aLists.Content()); } } ////////////////////////////////////////////////////////////////////// // Reflow methods /* virtual */ void nsInlineFrame::AddInlineMinWidth(nsRenderingContext *aRenderingContext, nsIFrame::InlineMinWidthData *aData) { DoInlineIntrinsicWidth(aRenderingContext, aData, nsLayoutUtils::MIN_WIDTH); } /* virtual */ void nsInlineFrame::AddInlinePrefWidth(nsRenderingContext *aRenderingContext, nsIFrame::InlinePrefWidthData *aData) { DoInlineIntrinsicWidth(aRenderingContext, aData, nsLayoutUtils::PREF_WIDTH); } /* virtual */ nsSize nsInlineFrame::ComputeSize(nsRenderingContext *aRenderingContext, nsSize aCBSize, nscoord aAvailableWidth, nsSize aMargin, nsSize aBorder, nsSize aPadding, uint32_t aFlags) { // Inlines and text don't compute size before reflow. return nsSize(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE); } nsRect nsInlineFrame::ComputeTightBounds(gfxContext* aContext) const { // be conservative if (StyleContext()->HasTextDecorationLines()) { return GetVisualOverflowRect(); } return ComputeSimpleTightBounds(aContext); } void nsInlineFrame::ReparentFloatsForInlineChild(nsIFrame* aOurLineContainer, nsIFrame* aFrame, bool aReparentSiblings) { // XXXbz this would be better if it took a nsFrameList or a frame // list slice.... NS_ASSERTION(aOurLineContainer->GetNextContinuation() || aOurLineContainer->GetPrevContinuation(), "Don't call this when we have no continuation, it's a waste"); if (!aFrame) { NS_ASSERTION(aReparentSiblings, "Why did we get called?"); return; } nsIFrame* ancestor = aFrame; do { ancestor = ancestor->GetParent(); if (!ancestor) return; } while (!ancestor->IsFloatContainingBlock()); if (ancestor == aOurLineContainer) return; nsBlockFrame* ourBlock = nsLayoutUtils::GetAsBlock(aOurLineContainer); NS_ASSERTION(ourBlock, "Not a block, but broke vertically?"); nsBlockFrame* frameBlock = nsLayoutUtils::GetAsBlock(ancestor); NS_ASSERTION(frameBlock, "ancestor not a block"); while (true) { ourBlock->ReparentFloats(aFrame, frameBlock, false); if (!aReparentSiblings) return; nsIFrame* next = aFrame->GetNextSibling(); if (!next) return; if (next->GetParent() == aFrame->GetParent()) { aFrame = next; continue; } // This is paranoid and will hardly ever get hit ... but we can't actually // trust that the frames in the sibling chain all have the same parent, // because lazy reparenting may be going on. If we find a different // parent we need to redo our analysis. ReparentFloatsForInlineChild(aOurLineContainer, next, aReparentSiblings); return; } } static void ReparentChildListStyle(nsPresContext* aPresContext, const nsFrameList::Slice& aFrames, nsIFrame* aParentFrame) { RestyleManager* restyleManager = aPresContext->RestyleManager(); for (nsFrameList::Enumerator e(aFrames); !e.AtEnd(); e.Next()) { NS_ASSERTION(e.get()->GetParent() == aParentFrame, "Bogus parentage"); restyleManager->ReparentStyleContext(e.get()); } } NS_IMETHODIMP nsInlineFrame::Reflow(nsPresContext* aPresContext, nsHTMLReflowMetrics& aMetrics, const nsHTMLReflowState& aReflowState, nsReflowStatus& aStatus) { DO_GLOBAL_REFLOW_COUNT("nsInlineFrame"); DISPLAY_REFLOW(aPresContext, this, aReflowState, aMetrics, aStatus); if (nullptr == aReflowState.mLineLayout) { return NS_ERROR_INVALID_ARG; } if (IsFrameTreeTooDeep(aReflowState, aMetrics, aStatus)) { return NS_OK; } bool lazilySetParentPointer = false; nsIFrame* lineContainer = aReflowState.mLineLayout->LineContainerFrame(); // Check for an overflow list with our prev-in-flow nsInlineFrame* prevInFlow = (nsInlineFrame*)GetPrevInFlow(); if (prevInFlow) { AutoFrameListPtr prevOverflowFrames(aPresContext, prevInFlow->StealOverflowFrames()); if (prevOverflowFrames) { // When pushing and pulling frames we need to check for whether any // views need to be reparented. nsContainerFrame::ReparentFrameViewList(aPresContext, *prevOverflowFrames, prevInFlow, this); // Check if we should do the lazilySetParentPointer optimization. // Only do it in simple cases where we're being reflowed for the // first time, nothing (e.g. bidi resolution) has already given // us children, and there's no next-in-flow, so all our frames // will be taken from prevOverflowFrames. if ((GetStateBits() & NS_FRAME_FIRST_REFLOW) && mFrames.IsEmpty() && !GetNextInFlow()) { // If our child list is empty, just put the new frames into it. // Note that we don't set the parent pointer for the new frames. Instead wait // to do this until we actually reflow the frame. If the overflow list contains // thousands of frames this is a big performance issue (see bug #5588) mFrames.SetFrames(*prevOverflowFrames); lazilySetParentPointer = true; } else { // Assign all floats to our block if necessary if (lineContainer && lineContainer->GetPrevContinuation()) { ReparentFloatsForInlineChild(lineContainer, prevOverflowFrames->FirstChild(), true); } // Insert the new frames at the beginning of the child list // and set their parent pointer const nsFrameList::Slice& newFrames = mFrames.InsertFrames(this, nullptr, *prevOverflowFrames); // If our prev in flow was under the first continuation of a first-line // frame then we need to reparent the style contexts to remove the // the special first-line styling. In the lazilySetParentPointer case // we reparent the style contexts when we set their parents in // nsInlineFrame::ReflowFrames and nsInlineFrame::ReflowInlineFrame. if (aReflowState.mLineLayout->GetInFirstLine()) { ReparentChildListStyle(aPresContext, newFrames, this); } } } } // It's also possible that we have an overflow list for ourselves #ifdef DEBUG if (GetStateBits() & NS_FRAME_FIRST_REFLOW) { // If it's our initial reflow, then we should not have an overflow list. // However, add an assertion in case we get reflowed more than once with // the initial reflow reason nsFrameList* overflowFrames = GetOverflowFrames(); NS_ASSERTION(!overflowFrames || overflowFrames->IsEmpty(), "overflow list is not empty for initial reflow"); } #endif if (!(GetStateBits() & NS_FRAME_FIRST_REFLOW)) { DrainFlags flags = lazilySetParentPointer ? eDontReparentFrames : DrainFlags(0); if (aReflowState.mLineLayout->GetInFirstLine()) { flags = DrainFlags(flags | eInFirstLine); } DrainSelfOverflowListInternal(flags, lineContainer); } // Set our own reflow state (additional state above and beyond // aReflowState) InlineReflowState irs; irs.mPrevFrame = nullptr; irs.mLineContainer = lineContainer; irs.mLineLayout = aReflowState.mLineLayout; irs.mNextInFlow = (nsInlineFrame*) GetNextInFlow(); irs.mSetParentPointer = lazilySetParentPointer; nsresult rv; if (mFrames.IsEmpty()) { // Try to pull over one frame before starting so that we know // whether we have an anonymous block or not. bool complete; (void) PullOneFrame(aPresContext, irs, &complete); } rv = ReflowFrames(aPresContext, aReflowState, irs, aMetrics, aStatus); ReflowAbsoluteFrames(aPresContext, aMetrics, aReflowState, aStatus); // Note: the line layout code will properly compute our // overflow-rect state for us. NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aMetrics); return rv; } bool nsInlineFrame::DrainSelfOverflowListInternal(DrainFlags aFlags, nsIFrame* aLineContainer) { AutoFrameListPtr overflowFrames(PresContext(), StealOverflowFrames()); if (overflowFrames) { NS_ASSERTION(mFrames.NotEmpty(), "overflow list w/o frames"); // The frames on our own overflowlist may have been pushed by a // previous lazilySetParentPointer Reflow so we need to ensure the // correct parent pointer. This is sometimes skipped by Reflow. if (!(aFlags & eDontReparentFrames)) { nsIFrame* firstChild = overflowFrames->FirstChild(); if (aLineContainer && aLineContainer->GetPrevContinuation()) { ReparentFloatsForInlineChild(aLineContainer, firstChild, true); } const bool inFirstLine = (aFlags & eInFirstLine); RestyleManager* restyleManager = PresContext()->RestyleManager(); for (nsIFrame* f = firstChild; f; f = f->GetNextSibling()) { f->SetParent(this); if (inFirstLine) { restyleManager->ReparentStyleContext(f); } } } bool result = !overflowFrames->IsEmpty(); mFrames.AppendFrames(nullptr, *overflowFrames); return result; } return false; } /* virtual */ bool nsInlineFrame::DrainSelfOverflowList() { nsIFrame* lineContainer = nsLayoutUtils::FindNearestBlockAncestor(this); // Add the eInFirstLine flag if we have a ::first-line ancestor frame. // No need to look further than the nearest line container though. DrainFlags flags = DrainFlags(0); for (nsIFrame* p = GetParent(); p != lineContainer; p = p->GetParent()) { if (p->GetType() == nsGkAtoms::lineFrame) { flags = DrainFlags(flags | eInFirstLine); break; } } return DrainSelfOverflowListInternal(flags, lineContainer); } /* virtual */ bool nsInlineFrame::CanContinueTextRun() const { // We can continue a text run through an inline frame return true; } /* virtual */ void nsInlineFrame::PullOverflowsFromPrevInFlow() { nsInlineFrame* prevInFlow = static_cast(GetPrevInFlow()); if (prevInFlow) { nsPresContext* presContext = PresContext(); AutoFrameListPtr prevOverflowFrames(presContext, prevInFlow->StealOverflowFrames()); if (prevOverflowFrames) { // Assume that our prev-in-flow has the same line container that we do. nsContainerFrame::ReparentFrameViewList(presContext, *prevOverflowFrames, prevInFlow, this); mFrames.InsertFrames(this, nullptr, *prevOverflowFrames); } } } nsresult nsInlineFrame::ReflowFrames(nsPresContext* aPresContext, const nsHTMLReflowState& aReflowState, InlineReflowState& irs, nsHTMLReflowMetrics& aMetrics, nsReflowStatus& aStatus) { nsresult rv = NS_OK; aStatus = NS_FRAME_COMPLETE; nsLineLayout* lineLayout = aReflowState.mLineLayout; bool inFirstLine = aReflowState.mLineLayout->GetInFirstLine(); RestyleManager* restyleManager = aPresContext->RestyleManager(); bool ltr = (NS_STYLE_DIRECTION_LTR == aReflowState.mStyleVisibility->mDirection); nscoord leftEdge = 0; // Don't offset by our start borderpadding if we have a prev continuation or // if we're in a part of an {ib} split other than the first one. if (!GetPrevContinuation() && !FrameIsNonFirstInIBSplit()) { leftEdge = ltr ? aReflowState.mComputedBorderPadding.left : aReflowState.mComputedBorderPadding.right; } nscoord availableWidth = aReflowState.availableWidth; NS_ASSERTION(availableWidth != NS_UNCONSTRAINEDSIZE, "should no longer use available widths"); // Subtract off left and right border+padding from availableWidth availableWidth -= leftEdge; availableWidth -= ltr ? aReflowState.mComputedBorderPadding.right : aReflowState.mComputedBorderPadding.left; lineLayout->BeginSpan(this, &aReflowState, leftEdge, leftEdge + availableWidth, &mBaseline); // First reflow our principal children. nsIFrame* frame = mFrames.FirstChild(); bool done = false; while (frame) { // Check if we should lazily set the child frame's parent pointer. if (irs.mSetParentPointer) { bool havePrevBlock = irs.mLineContainer && irs.mLineContainer->GetPrevContinuation(); nsIFrame* child = frame; do { // If our block is the first in flow, then any floats under the pulled // frame must already belong to our block. if (havePrevBlock) { // This has to happen before we update frame's parent; we need to // know frame's ancestry under its old block. // The blockChildren.ContainsFrame check performed by // ReparentFloatsForInlineChild here may be slow, but we can't // easily avoid it because we don't know where 'frame' originally // came from. If we really really have to optimize this we could // cache whether frame->GetParent() is under its containing blocks // overflowList or not. ReparentFloatsForInlineChild(irs.mLineContainer, child, false); } child->SetParent(this); if (inFirstLine) { restyleManager->ReparentStyleContext(child); } // We also need to do the same for |frame|'s next-in-flows that are in // the sibling list. Otherwise, if we reflow |frame| and it's complete // we'll crash when trying to delete its next-in-flow. // This scenario doesn't happen often, but it can happen. nsIFrame* nextSibling = child->GetNextSibling(); child = child->GetNextInFlow(); if (MOZ_UNLIKELY(child)) { while (child != nextSibling && nextSibling) { nextSibling = nextSibling->GetNextSibling(); } if (!nextSibling) { child = nullptr; } } MOZ_ASSERT(!child || mFrames.ContainsFrame(child)); } while (child); // Fix the parent pointer for ::first-letter child frame next-in-flows, // so nsFirstLetterFrame::Reflow can destroy them safely (bug 401042). nsIFrame* realFrame = nsPlaceholderFrame::GetRealFrameFor(frame); if (realFrame->GetType() == nsGkAtoms::letterFrame) { nsIFrame* child = realFrame->GetFirstPrincipalChild(); if (child) { NS_ASSERTION(child->GetType() == nsGkAtoms::textFrame, "unexpected frame type"); nsIFrame* nextInFlow = child->GetNextInFlow(); for ( ; nextInFlow; nextInFlow = nextInFlow->GetNextInFlow()) { NS_ASSERTION(nextInFlow->GetType() == nsGkAtoms::textFrame, "unexpected frame type"); if (mFrames.ContainsFrame(nextInFlow)) { nextInFlow->SetParent(this); if (inFirstLine) { restyleManager->ReparentStyleContext(nextInFlow); } } else { #ifdef DEBUG // Once we find a next-in-flow that isn't ours none of the // remaining next-in-flows should be either. for ( ; nextInFlow; nextInFlow = nextInFlow->GetNextInFlow()) { NS_ASSERTION(!mFrames.ContainsFrame(nextInFlow), "unexpected letter frame flow"); } #endif break; } } } } } MOZ_ASSERT(frame->GetParent() == this); if (!done) { bool reflowingFirstLetter = lineLayout->GetFirstLetterStyleOK(); rv = ReflowInlineFrame(aPresContext, aReflowState, irs, frame, aStatus); done = NS_FAILED(rv) || NS_INLINE_IS_BREAK(aStatus) || (!reflowingFirstLetter && NS_FRAME_IS_NOT_COMPLETE(aStatus)); if (done) { if (!irs.mSetParentPointer) { break; } // Keep reparenting the remaining siblings, but don't reflow them. nsFrameList* pushedFrames = GetOverflowFrames(); if (pushedFrames && pushedFrames->FirstChild() == frame) { // Don't bother if |frame| was pushed to our overflow list. break; } } else { irs.mPrevFrame = frame; } } frame = frame->GetNextSibling(); } // Attempt to pull frames from our next-in-flow until we can't if (!done && GetNextInFlow()) { while (true) { bool reflowingFirstLetter = lineLayout->GetFirstLetterStyleOK(); bool isComplete; if (!frame) { // Could be non-null if we pulled a first-letter frame and // it created a continuation, since we don't push those. frame = PullOneFrame(aPresContext, irs, &isComplete); } #ifdef NOISY_PUSHING printf("%p pulled up %p\n", this, frame); #endif if (nullptr == frame) { if (!isComplete) { aStatus = NS_FRAME_NOT_COMPLETE; } break; } rv = ReflowInlineFrame(aPresContext, aReflowState, irs, frame, aStatus); if (NS_FAILED(rv) || NS_INLINE_IS_BREAK(aStatus) || (!reflowingFirstLetter && NS_FRAME_IS_NOT_COMPLETE(aStatus))) { break; } irs.mPrevFrame = frame; frame = frame->GetNextSibling(); } } NS_ASSERTION(!NS_FRAME_IS_COMPLETE(aStatus) || !GetOverflowFrames(), "We can't be complete AND have overflow frames!"); // If after reflowing our children they take up no area then make // sure that we don't either. // // Note: CSS demands that empty inline elements still affect the // line-height calculations. However, continuations of an inline // that are empty we force to empty so that things like collapsed // whitespace in an inline element don't affect the line-height. aMetrics.width = lineLayout->EndSpan(this); // Compute final width. // Make sure to not include our start border and padding if we have a prev // continuation or if we're in a part of an {ib} split other than the first // one. if (!GetPrevContinuation() && !FrameIsNonFirstInIBSplit()) { aMetrics.width += ltr ? aReflowState.mComputedBorderPadding.left : aReflowState.mComputedBorderPadding.right; } /* * We want to only apply the end border and padding if we're the last * continuation and either not in an {ib} split or the last part of it. To * be the last continuation we have to be complete (so that we won't get a * next-in-flow) and have no non-fluid continuations on our continuation * chain. */ if (NS_FRAME_IS_COMPLETE(aStatus) && !LastInFlow()->GetNextContinuation() && !FrameIsNonLastInIBSplit()) { aMetrics.width += ltr ? aReflowState.mComputedBorderPadding.right : aReflowState.mComputedBorderPadding.left; } nsRefPtr fm; float inflation = nsLayoutUtils::FontSizeInflationFor(this); nsLayoutUtils::GetFontMetricsForFrame(this, getter_AddRefs(fm), inflation); aReflowState.rendContext->SetFont(fm); if (fm) { // Compute final height of the frame. // // Do things the standard css2 way -- though it's hard to find it // in the css2 spec! It's actually found in the css1 spec section // 4.4 (you will have to read between the lines to really see // it). // // The height of our box is the sum of our font size plus the top // and bottom border and padding. The height of children do not // affect our height. aMetrics.ascent = fm->MaxAscent(); aMetrics.height = fm->MaxHeight(); } else { NS_WARNING("Cannot get font metrics - defaulting sizes to 0"); aMetrics.ascent = aMetrics.height = 0; } aMetrics.ascent += aReflowState.mComputedBorderPadding.top; aMetrics.height += aReflowState.mComputedBorderPadding.top + aReflowState.mComputedBorderPadding.bottom; // For now our overflow area is zero. The real value will be // computed in |nsLineLayout::RelativePositionFrames|. aMetrics.mOverflowAreas.Clear(); #ifdef NOISY_FINAL_SIZE ListTag(stdout); printf(": metrics=%d,%d ascent=%d\n", aMetrics.width, aMetrics.height, aMetrics.ascent); #endif return rv; } nsresult nsInlineFrame::ReflowInlineFrame(nsPresContext* aPresContext, const nsHTMLReflowState& aReflowState, InlineReflowState& irs, nsIFrame* aFrame, nsReflowStatus& aStatus) { nsLineLayout* lineLayout = aReflowState.mLineLayout; bool reflowingFirstLetter = lineLayout->GetFirstLetterStyleOK(); bool pushedFrame; nsresult rv = lineLayout->ReflowFrame(aFrame, aStatus, nullptr, pushedFrame); if (NS_FAILED(rv)) { return rv; } if (NS_INLINE_IS_BREAK_BEFORE(aStatus)) { if (aFrame != mFrames.FirstChild()) { // Change break-before status into break-after since we have // already placed at least one child frame. This preserves the // break-type so that it can be propagated upward. aStatus = NS_FRAME_NOT_COMPLETE | NS_INLINE_BREAK | NS_INLINE_BREAK_AFTER | (aStatus & NS_INLINE_BREAK_TYPE_MASK); PushFrames(aPresContext, aFrame, irs.mPrevFrame, irs); } else { // Preserve reflow status when breaking-before our first child // and propagate it upward without modification. } return NS_OK; } // Create a next-in-flow if needed. if (!NS_FRAME_IS_FULLY_COMPLETE(aStatus)) { nsIFrame* newFrame; rv = CreateNextInFlow(aPresContext, aFrame, newFrame); if (NS_FAILED(rv)) { return rv; } } if (NS_INLINE_IS_BREAK_AFTER(aStatus)) { nsIFrame* nextFrame = aFrame->GetNextSibling(); if (nextFrame) { NS_FRAME_SET_INCOMPLETE(aStatus); PushFrames(aPresContext, nextFrame, aFrame, irs); } else { // We must return an incomplete status if there are more child // frames remaining in a next-in-flow that follows this frame. nsInlineFrame* nextInFlow = static_cast(GetNextInFlow()); while (nextInFlow) { if (nextInFlow->mFrames.NotEmpty()) { NS_FRAME_SET_INCOMPLETE(aStatus); break; } nextInFlow = static_cast(nextInFlow->GetNextInFlow()); } } return NS_OK; } if (!NS_FRAME_IS_FULLY_COMPLETE(aStatus) && !reflowingFirstLetter) { nsIFrame* nextFrame = aFrame->GetNextSibling(); if (nextFrame) { PushFrames(aPresContext, nextFrame, aFrame, irs); } } return NS_OK; } nsIFrame* nsInlineFrame::PullOneFrame(nsPresContext* aPresContext, InlineReflowState& irs, bool* aIsComplete) { bool isComplete = true; nsIFrame* frame = nullptr; nsInlineFrame* nextInFlow = irs.mNextInFlow; while (nextInFlow) { frame = nextInFlow->mFrames.FirstChild(); if (!frame) { // The nextInFlow's principal list has no frames, try its overflow list. nsFrameList* overflowFrames = nextInFlow->GetOverflowFrames(); if (overflowFrames) { frame = overflowFrames->RemoveFirstChild(); if (overflowFrames->IsEmpty()) { // We're stealing the only frame - delete the overflow list. nextInFlow->DestroyOverflowList(aPresContext); } else { // We leave the remaining frames on the overflow list (rather than // putting them on nextInFlow's principal list) so we don't have to // set up the parent for them. } // ReparentFloatsForInlineChild needs it to be on a child list - // we remove it again below. nextInFlow->mFrames.SetFrames(frame); } } if (frame) { // If our block has no next continuation, then any floats belonging to // the pulled frame must belong to our block already. This check ensures // we do no extra work in the common non-vertical-breaking case. if (irs.mLineContainer && irs.mLineContainer->GetNextContinuation()) { // The blockChildren.ContainsFrame check performed by // ReparentFloatsForInlineChild will be fast because frame's ancestor // will be the first child of its containing block. ReparentFloatsForInlineChild(irs.mLineContainer, frame, false); } nextInFlow->mFrames.RemoveFirstChild(); // nsFirstLineFrame::PullOneFrame calls ReparentStyleContext. mFrames.InsertFrame(this, irs.mPrevFrame, frame); isComplete = false; if (irs.mLineLayout) { irs.mLineLayout->SetDirtyNextLine(); } nsContainerFrame::ReparentFrameView(aPresContext, frame, nextInFlow, this); break; } nextInFlow = static_cast(nextInFlow->GetNextInFlow()); irs.mNextInFlow = nextInFlow; } *aIsComplete = isComplete; return frame; } void nsInlineFrame::PushFrames(nsPresContext* aPresContext, nsIFrame* aFromChild, nsIFrame* aPrevSibling, InlineReflowState& aState) { NS_PRECONDITION(aFromChild, "null pointer"); NS_PRECONDITION(aPrevSibling, "pushing first child"); NS_PRECONDITION(aPrevSibling->GetNextSibling() == aFromChild, "bad prev sibling"); #ifdef NOISY_PUSHING printf("%p pushing aFromChild %p, disconnecting from prev sib %p\n", this, aFromChild, aPrevSibling); #endif // Add the frames to our overflow list (let our next in flow drain // our overflow list when it is ready) SetOverflowFrames(aPresContext, mFrames.RemoveFramesAfter(aPrevSibling)); if (aState.mLineLayout) { aState.mLineLayout->SetDirtyNextLine(); } } ////////////////////////////////////////////////////////////////////// int nsInlineFrame::GetSkipSides(const nsHTMLReflowState* aReflowState) const { int skip = 0; if (!IsLeftMost()) { nsInlineFrame* prev = (nsInlineFrame*) GetPrevContinuation(); if ((GetStateBits() & NS_INLINE_FRAME_BIDI_VISUAL_STATE_IS_SET) || (prev && (prev->mRect.height || prev->mRect.width))) { // Prev continuation is not empty therefore we don't render our left // border edge. skip |= 1 << NS_SIDE_LEFT; } else { // If the prev continuation is empty, then go ahead and let our left // edge border render. } } if (!IsRightMost()) { nsInlineFrame* next = (nsInlineFrame*) GetNextContinuation(); if ((GetStateBits() & NS_INLINE_FRAME_BIDI_VISUAL_STATE_IS_SET) || (next && (next->mRect.height || next->mRect.width))) { // Next continuation is not empty therefore we don't render our right // border edge. skip |= 1 << NS_SIDE_RIGHT; } else { // If the next continuation is empty, then go ahead and let our right // edge border render. } } if (GetStateBits() & NS_FRAME_IS_SPECIAL) { // All but the last part of an {ib} split should skip the "end" side (as // determined by this frame's direction) and all but the first part of such // a split should skip the "start" side. But figuring out which part of // the split we are involves getting our first continuation, which might be // expensive. So don't bother if we already have the relevant bits set. bool ltr = (NS_STYLE_DIRECTION_LTR == StyleVisibility()->mDirection); int startBit = (1 << (ltr ? NS_SIDE_LEFT : NS_SIDE_RIGHT)); int endBit = (1 << (ltr ? NS_SIDE_RIGHT : NS_SIDE_LEFT)); if (((startBit | endBit) & skip) != (startBit | endBit)) { // We're missing one of the skip bits, so check whether we need to set it. // Only get the first continuation once, as an optimization. nsIFrame* firstContinuation = FirstContinuation(); if (firstContinuation->FrameIsNonLastInIBSplit()) { skip |= endBit; } if (firstContinuation->FrameIsNonFirstInIBSplit()) { skip |= startBit; } } } return skip; } nscoord nsInlineFrame::GetBaseline() const { return mBaseline; } #ifdef ACCESSIBILITY a11y::AccType nsInlineFrame::AccessibleType() { // Broken image accessibles are created here, because layout // replaces the image or image control frame with an inline frame nsIAtom *tagAtom = mContent->Tag(); if (tagAtom == nsGkAtoms::input) // Broken return a11y::eHTMLButtonType; if (tagAtom == nsGkAtoms::img) // Create accessible for broken return a11y::eHyperTextType; return a11y::eNoType; } #endif ////////////////////////////////////////////////////////////////////// // nsLineFrame implementation nsIFrame* NS_NewFirstLineFrame(nsIPresShell* aPresShell, nsStyleContext* aContext) { return new (aPresShell) nsFirstLineFrame(aContext); } NS_IMPL_FRAMEARENA_HELPERS(nsFirstLineFrame) void nsFirstLineFrame::Init(nsIContent* aContent, nsIFrame* aParent, nsIFrame* aPrevInFlow) { nsInlineFrame::Init(aContent, aParent, aPrevInFlow); if (!aPrevInFlow) { MOZ_ASSERT(StyleContext()->GetPseudo() == nsCSSPseudoElements::firstLine); return; } // This frame is a continuation - fixup the style context if aPrevInFlow // is the first-in-flow (the only one with a ::first-line pseudo). if (aPrevInFlow->StyleContext()->GetPseudo() == nsCSSPseudoElements::firstLine) { MOZ_ASSERT(FirstInFlow() == aPrevInFlow); // Create a new style context that is a child of the parent // style context thus removing the ::first-line style. This way // we behave as if an anonymous (unstyled) span was the child // of the parent frame. nsStyleContext* parentContext = aParent->StyleContext(); nsRefPtr newSC = PresContext()->StyleSet()-> ResolveAnonymousBoxStyle(nsCSSAnonBoxes::mozLineFrame, parentContext); SetStyleContext(newSC); } else { MOZ_ASSERT(FirstInFlow() != aPrevInFlow); MOZ_ASSERT(aPrevInFlow->StyleContext()->GetPseudo() == nsCSSAnonBoxes::mozLineFrame); } } #ifdef DEBUG NS_IMETHODIMP nsFirstLineFrame::GetFrameName(nsAString& aResult) const { return MakeFrameName(NS_LITERAL_STRING("Line"), aResult); } #endif nsIAtom* nsFirstLineFrame::GetType() const { return nsGkAtoms::lineFrame; } nsIFrame* nsFirstLineFrame::PullOneFrame(nsPresContext* aPresContext, InlineReflowState& irs, bool* aIsComplete) { nsIFrame* frame = nsInlineFrame::PullOneFrame(aPresContext, irs, aIsComplete); if (frame && !GetPrevInFlow()) { // We are a first-line frame. Fixup the child frames // style-context that we just pulled. NS_ASSERTION(frame->GetParent() == this, "Incorrect parent?"); aPresContext->RestyleManager()->ReparentStyleContext(frame); } return frame; } NS_IMETHODIMP nsFirstLineFrame::Reflow(nsPresContext* aPresContext, nsHTMLReflowMetrics& aMetrics, const nsHTMLReflowState& aReflowState, nsReflowStatus& aStatus) { if (nullptr == aReflowState.mLineLayout) { return NS_ERROR_INVALID_ARG; } nsIFrame* lineContainer = aReflowState.mLineLayout->LineContainerFrame(); // Check for an overflow list with our prev-in-flow nsFirstLineFrame* prevInFlow = (nsFirstLineFrame*)GetPrevInFlow(); if (prevInFlow) { AutoFrameListPtr prevOverflowFrames(aPresContext, prevInFlow->StealOverflowFrames()); if (prevOverflowFrames) { // Assign all floats to our block if necessary if (lineContainer && lineContainer->GetPrevContinuation()) { ReparentFloatsForInlineChild(lineContainer, prevOverflowFrames->FirstChild(), true); } const nsFrameList::Slice& newFrames = mFrames.InsertFrames(this, nullptr, *prevOverflowFrames); ReparentChildListStyle(aPresContext, newFrames, this); } } // It's also possible that we have an overflow list for ourselves. DrainSelfOverflowList(); // Set our own reflow state (additional state above and beyond // aReflowState) InlineReflowState irs; irs.mPrevFrame = nullptr; irs.mLineContainer = lineContainer; irs.mLineLayout = aReflowState.mLineLayout; irs.mNextInFlow = (nsInlineFrame*) GetNextInFlow(); nsresult rv; bool wasEmpty = mFrames.IsEmpty(); if (wasEmpty) { // Try to pull over one frame before starting so that we know // whether we have an anonymous block or not. bool complete; PullOneFrame(aPresContext, irs, &complete); } if (nullptr == GetPrevInFlow()) { // XXX This is pretty sick, but what we do here is to pull-up, in // advance, all of the next-in-flows children. We re-resolve their // style while we are at at it so that when we reflow they have // the right style. // // All of this is so that text-runs reflow properly. irs.mPrevFrame = mFrames.LastChild(); for (;;) { bool complete; nsIFrame* frame = PullOneFrame(aPresContext, irs, &complete); if (!frame) { break; } irs.mPrevFrame = frame; } irs.mPrevFrame = nullptr; } NS_ASSERTION(!aReflowState.mLineLayout->GetInFirstLine(), "Nested first-line frames? BOGUS"); aReflowState.mLineLayout->SetInFirstLine(true); rv = ReflowFrames(aPresContext, aReflowState, irs, aMetrics, aStatus); aReflowState.mLineLayout->SetInFirstLine(false); ReflowAbsoluteFrames(aPresContext, aMetrics, aReflowState, aStatus); // Note: the line layout code will properly compute our overflow state for us return rv; } /* virtual */ void nsFirstLineFrame::PullOverflowsFromPrevInFlow() { nsFirstLineFrame* prevInFlow = static_cast(GetPrevInFlow()); if (prevInFlow) { nsPresContext* presContext = PresContext(); AutoFrameListPtr prevOverflowFrames(presContext, prevInFlow->StealOverflowFrames()); if (prevOverflowFrames) { // Assume that our prev-in-flow has the same line container that we do. const nsFrameList::Slice& newFrames = mFrames.InsertFrames(this, nullptr, *prevOverflowFrames); ReparentChildListStyle(presContext, newFrames, this); } } } /* virtual */ bool nsFirstLineFrame::DrainSelfOverflowList() { AutoFrameListPtr overflowFrames(PresContext(), StealOverflowFrames()); if (overflowFrames) { NS_ASSERTION(mFrames.NotEmpty(), "overflow list w/o frames"); bool result = !overflowFrames->IsEmpty(); const nsFrameList::Slice& newFrames = mFrames.AppendFrames(nullptr, *overflowFrames); ReparentChildListStyle(PresContext(), newFrames, this); return result; } return false; }