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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /layout/generic/nsInlineFrame.cpp
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
Diffstat (limited to 'layout/generic/nsInlineFrame.cpp')
-rw-r--r--layout/generic/nsInlineFrame.cpp1201
1 files changed, 1201 insertions, 0 deletions
diff --git a/layout/generic/nsInlineFrame.cpp b/layout/generic/nsInlineFrame.cpp
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+++ b/layout/generic/nsInlineFrame.cpp
@@ -0,0 +1,1201 @@
+/* -*- 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 "mozilla/RestyleManagerHandle.h"
+#include "mozilla/RestyleManagerHandleInlines.h"
+#include "nsDisplayList.h"
+#include "mozilla/Likely.h"
+#include "SVGTextFrame.h"
+#include "mozilla/StyleSetHandle.h"
+#include "mozilla/StyleSetHandleInlines.h"
+
+#ifdef DEBUG
+#undef NOISY_PUSHING
+#endif
+
+using namespace mozilla;
+using namespace mozilla::layout;
+
+
+//////////////////////////////////////////////////////////////////////
+
+// Basic nsInlineFrame methods
+
+nsInlineFrame*
+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_FRAME_DUMP
+nsresult
+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::svgTextFrame);
+ svgTextFrame->InvalidateFrame();
+ return;
+ }
+ nsContainerFrame::InvalidateFrame(aDisplayItemKey);
+}
+
+void
+nsInlineFrame::InvalidateFrameWithRect(const nsRect& aRect, uint32_t aDisplayItemKey)
+{
+ if (IsSVGText()) {
+ nsIFrame* svgTextFrame =
+ nsLayoutUtils::GetClosestFrameOfType(GetParent(),
+ nsGkAtoms::svgTextFrame);
+ svgTextFrame->InvalidateFrame();
+ return;
+ }
+ nsContainerFrame::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();
+ // Block-start and -end ignored, 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?
+ WritingMode wm = GetWritingMode();
+ bool haveStart, haveEnd;
+ // Initially set up haveStart and haveEnd in terms of visual (LTR/TTB)
+ // coordinates; we'll exchange them later if bidi-RTL is in effect to
+ // get logical start and end flags.
+ if (wm.IsVertical()) {
+ haveStart =
+ border->GetComputedBorderWidth(NS_SIDE_TOP) != 0 ||
+ !nsLayoutUtils::IsPaddingZero(padding->mPadding.GetTop()) ||
+ !IsMarginZero(margin->mMargin.GetTop());
+ haveEnd =
+ border->GetComputedBorderWidth(NS_SIDE_BOTTOM) != 0 ||
+ !nsLayoutUtils::IsPaddingZero(padding->mPadding.GetBottom()) ||
+ !IsMarginZero(margin->mMargin.GetBottom());
+ } else {
+ haveStart =
+ border->GetComputedBorderWidth(NS_SIDE_LEFT) != 0 ||
+ !nsLayoutUtils::IsPaddingZero(padding->mPadding.GetLeft()) ||
+ !IsMarginZero(margin->mMargin.GetLeft());
+ haveEnd =
+ border->GetComputedBorderWidth(NS_SIDE_RIGHT) != 0 ||
+ !nsLayoutUtils::IsPaddingZero(padding->mPadding.GetRight()) ||
+ !IsMarginZero(margin->mMargin.GetRight());
+ }
+ if (haveStart || haveEnd) {
+ // We skip this block and return false for box-decoration-break:clone since
+ // in that case all the continuations will have the border/padding/margin.
+ if ((GetStateBits() & NS_FRAME_PART_OF_IBSPLIT) &&
+ StyleBorder()->mBoxDecorationBreak == StyleBoxDecorationBreak::Slice) {
+ // When direction=rtl, we need to consider logical rather than visual
+ // start and end, so swap the flags.
+ if (!wm.IsBidiLTR()) {
+ Swap(haveStart, haveEnd);
+ }
+ // For ib-split frames, ignore things we know we'll skip in GetSkipSides.
+ // XXXbz should we be doing this for non-ib-split 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) {
+ if (!kid->IsEmpty())
+ return false;
+ }
+
+ return true;
+}
+
+nsIFrame::FrameSearchResult
+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 CONTINUE;
+}
+
+void
+nsInlineFrame::DestroyFrom(nsIFrame* aDestructRoot)
+{
+ nsFrameList* overflowFrames = GetOverflowFrames();
+ if (overflowFrames) {
+ // Fixup the parent pointers for any child frames on the OverflowList.
+ // nsIFrame::DestroyFrom depends on that to find the sticky scroll
+ // container (an ancestor).
+ nsIFrame* lineContainer = nsLayoutUtils::FindNearestBlockAncestor(this);
+ DrainSelfOverflowListInternal(eForDestroy, lineContainer);
+ }
+ nsContainerFrame::DestroyFrom(aDestructRoot);
+}
+
+nsresult
+nsInlineFrame::StealFrame(nsIFrame* aChild)
+{
+ if (MaybeStealOverflowContainerFrame(aChild)) {
+ return NS_OK;
+ }
+
+ nsInlineFrame* parent = this;
+ bool removed = false;
+ do {
+ removed = parent->mFrames.StartRemoveFrame(aChild);
+ if (removed) {
+ break;
+ }
+
+ // We didn't find the child in our principal child list.
+ // Maybe it's on the overflow list?
+ nsFrameList* frameList = parent->GetOverflowFrames();
+ if (frameList) {
+ removed = frameList->ContinueRemoveFrame(aChild);
+ if (frameList->IsEmpty()) {
+ parent->DestroyOverflowList();
+ }
+ if (removed) {
+ break;
+ }
+ }
+
+ // Due to our "lazy reparenting" optimization 'aChild' might not actually
+ // be on any of our child lists, but instead in one of our next-in-flows.
+ parent = static_cast<nsInlineFrame*>(parent->GetNextInFlow());
+ } while (parent);
+
+ MOZ_ASSERT(removed, "nsInlineFrame::StealFrame: can't find aChild");
+ return removed ? NS_OK : NS_ERROR_UNEXPECTED;
+}
+
+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::AddInlineMinISize(nsRenderingContext *aRenderingContext,
+ nsIFrame::InlineMinISizeData *aData)
+{
+ DoInlineIntrinsicISize(aRenderingContext, aData, nsLayoutUtils::MIN_ISIZE);
+}
+
+/* virtual */ void
+nsInlineFrame::AddInlinePrefISize(nsRenderingContext *aRenderingContext,
+ nsIFrame::InlinePrefISizeData *aData)
+{
+ DoInlineIntrinsicISize(aRenderingContext, aData, nsLayoutUtils::PREF_ISIZE);
+}
+
+/* virtual */
+LogicalSize
+nsInlineFrame::ComputeSize(nsRenderingContext *aRenderingContext,
+ WritingMode aWM,
+ const LogicalSize& aCBSize,
+ nscoord aAvailableISize,
+ const LogicalSize& aMargin,
+ const LogicalSize& aBorder,
+ const LogicalSize& aPadding,
+ ComputeSizeFlags aFlags)
+{
+ // Inlines and text don't compute size before reflow.
+ return LogicalSize(aWM, NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
+}
+
+nsRect
+nsInlineFrame::ComputeTightBounds(DrawTarget* aDrawTarget) const
+{
+ // be conservative
+ if (StyleContext()->HasTextDecorationLines()) {
+ return GetVisualOverflowRect();
+ }
+ return ComputeSimpleTightBounds(aDrawTarget);
+}
+
+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;
+ }
+
+ nsBlockFrame* frameBlock = nsLayoutUtils::GetFloatContainingBlock(aFrame);
+ if (!frameBlock || frameBlock == aOurLineContainer) {
+ return;
+ }
+
+ nsBlockFrame* ourBlock = nsLayoutUtils::GetAsBlock(aOurLineContainer);
+ NS_ASSERTION(ourBlock, "Not a block, but broke vertically?");
+
+ 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)
+{
+ RestyleManagerHandle restyleManager = aPresContext->RestyleManager();
+
+ for (nsFrameList::Enumerator e(aFrames); !e.AtEnd(); e.Next()) {
+ NS_ASSERTION(e.get()->GetParent() == aParentFrame, "Bogus parentage");
+ restyleManager->ReparentStyleContext(e.get());
+ nsLayoutUtils::MarkDescendantsDirty(e.get());
+ }
+}
+
+void
+nsInlineFrame::Reflow(nsPresContext* aPresContext,
+ ReflowOutput& aMetrics,
+ const ReflowInput& aReflowInput,
+ nsReflowStatus& aStatus)
+{
+ MarkInReflow();
+ DO_GLOBAL_REFLOW_COUNT("nsInlineFrame");
+ DISPLAY_REFLOW(aPresContext, this, aReflowInput, aMetrics, aStatus);
+ if (nullptr == aReflowInput.mLineLayout) {
+ NS_ERROR("must have non-null aReflowInput.mLineLayout");
+ return;
+ }
+ if (IsFrameTreeTooDeep(aReflowInput, aMetrics, aStatus)) {
+ return;
+ }
+
+ bool lazilySetParentPointer = false;
+
+ nsIFrame* lineContainer = aReflowInput.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(*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 (aReflowInput.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 (aReflowInput.mLineLayout->GetInFirstLine()) {
+ flags = DrainFlags(flags | eInFirstLine);
+ }
+ DrainSelfOverflowListInternal(flags, lineContainer);
+ }
+
+ // Set our own reflow state (additional state above and beyond
+ // aReflowInput)
+ InlineReflowInput irs;
+ irs.mPrevFrame = nullptr;
+ irs.mLineContainer = lineContainer;
+ irs.mLineLayout = aReflowInput.mLineLayout;
+ irs.mNextInFlow = (nsInlineFrame*) GetNextInFlow();
+ irs.mSetParentPointer = lazilySetParentPointer;
+
+ 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);
+ }
+
+ ReflowFrames(aPresContext, aReflowInput, irs, aMetrics, aStatus);
+
+ ReflowAbsoluteFrames(aPresContext, aMetrics, aReflowInput, aStatus);
+
+ // Note: the line layout code will properly compute our
+ // overflow-rect state for us.
+
+ NS_FRAME_SET_TRUNCATION(aStatus, aReflowInput, aMetrics);
+}
+
+nsresult
+nsInlineFrame::AttributeChanged(int32_t aNameSpaceID,
+ nsIAtom* aAttribute,
+ int32_t aModType)
+{
+ nsresult rv =
+ nsContainerFrame::AttributeChanged(aNameSpaceID, aAttribute, aModType);
+
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+
+ if (IsSVGText()) {
+ SVGTextFrame* f = static_cast<SVGTextFrame*>(
+ nsLayoutUtils::GetClosestFrameOfType(this, nsGkAtoms::svgTextFrame));
+ f->HandleAttributeChangeInDescendant(mContent->AsElement(),
+ aNameSpaceID, aAttribute);
+ }
+
+ return NS_OK;
+}
+
+bool
+nsInlineFrame::DrainSelfOverflowListInternal(DrainFlags aFlags,
+ nsIFrame* aLineContainer)
+{
+ AutoFrameListPtr overflowFrames(PresContext(), StealOverflowFrames());
+ if (overflowFrames) {
+ // 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 doReparentSC =
+ (aFlags & eInFirstLine) && !(aFlags & eForDestroy);
+ RestyleManagerHandle restyleManager = PresContext()->RestyleManager();
+ for (nsIFrame* f = firstChild; f; f = f->GetNextSibling()) {
+ f->SetParent(this);
+ if (doReparentSC) {
+ restyleManager->ReparentStyleContext(f);
+ nsLayoutUtils::MarkDescendantsDirty(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<nsInlineFrame*>(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(*prevOverflowFrames, prevInFlow,
+ this);
+ mFrames.InsertFrames(this, nullptr, *prevOverflowFrames);
+ }
+ }
+}
+
+void
+nsInlineFrame::ReflowFrames(nsPresContext* aPresContext,
+ const ReflowInput& aReflowInput,
+ InlineReflowInput& irs,
+ ReflowOutput& aMetrics,
+ nsReflowStatus& aStatus)
+{
+ aStatus = NS_FRAME_COMPLETE;
+
+ nsLineLayout* lineLayout = aReflowInput.mLineLayout;
+ bool inFirstLine = aReflowInput.mLineLayout->GetInFirstLine();
+ RestyleManagerHandle restyleManager = aPresContext->RestyleManager();
+ WritingMode frameWM = aReflowInput.GetWritingMode();
+ WritingMode lineWM = aReflowInput.mLineLayout->mRootSpan->mWritingMode;
+ LogicalMargin framePadding = aReflowInput.ComputedLogicalBorderPadding();
+ nscoord startEdge = 0;
+ const bool boxDecorationBreakClone =
+ MOZ_UNLIKELY(StyleBorder()->mBoxDecorationBreak ==
+ StyleBoxDecorationBreak::Clone);
+ // 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. For
+ // box-decoration-break:clone we always offset our start since all
+ // continuations have border/padding.
+ if ((!GetPrevContinuation() && !FrameIsNonFirstInIBSplit()) ||
+ boxDecorationBreakClone) {
+ startEdge = framePadding.IStart(frameWM);
+ }
+ nscoord availableISize = aReflowInput.AvailableISize();
+ NS_ASSERTION(availableISize != NS_UNCONSTRAINEDSIZE,
+ "should no longer use available widths");
+ // Subtract off inline axis border+padding from availableISize
+ availableISize -= startEdge;
+ availableISize -= framePadding.IEnd(frameWM);
+ lineLayout->BeginSpan(this, &aReflowInput, startEdge,
+ startEdge + availableISize, &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);
+ nsLayoutUtils::MarkDescendantsDirty(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->PrincipalChildList().FirstChild();
+ 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);
+ nsLayoutUtils::MarkDescendantsDirty(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();
+ ReflowInlineFrame(aPresContext, aReflowInput, irs, frame, aStatus);
+ done = 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;
+ }
+ ReflowInlineFrame(aPresContext, aReflowInput, irs, frame, aStatus);
+ if (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.ISize(lineWM) = lineLayout->EndSpan(this);
+
+ // Compute final width.
+
+ // XXX Note that that the padding start and end are in the frame's
+ // writing mode, but the metrics' inline-size is in the line's
+ // writing mode. This makes sense if the line and frame are both
+ // vertical or both horizontal, but what should happen with
+ // orthogonal inlines?
+
+ // 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. For box-decoration-break:clone we always include our start border
+ // and padding since all continuations have them.
+ if ((!GetPrevContinuation() && !FrameIsNonFirstInIBSplit()) ||
+ boxDecorationBreakClone) {
+ aMetrics.ISize(lineWM) += framePadding.IStart(frameWM);
+ }
+
+ /*
+ * 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. For box-decoration-break:clone we always apply the end border and
+ * padding since all continuations have them.
+ */
+ if ((NS_FRAME_IS_COMPLETE(aStatus) &&
+ !LastInFlow()->GetNextContinuation() &&
+ !FrameIsNonLastInIBSplit()) ||
+ boxDecorationBreakClone) {
+ aMetrics.ISize(lineWM) += framePadding.IEnd(frameWM);
+ }
+
+ nsLayoutUtils::SetBSizeFromFontMetrics(this, aMetrics,
+ framePadding, lineWM, frameWM);
+
+ // 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.TopAscent());
+#endif
+}
+
+void
+nsInlineFrame::ReflowInlineFrame(nsPresContext* aPresContext,
+ const ReflowInput& aReflowInput,
+ InlineReflowInput& irs,
+ nsIFrame* aFrame,
+ nsReflowStatus& aStatus)
+{
+ nsLineLayout* lineLayout = aReflowInput.mLineLayout;
+ bool reflowingFirstLetter = lineLayout->GetFirstLetterStyleOK();
+ bool pushedFrame;
+ lineLayout->ReflowFrame(aFrame, aStatus, nullptr, pushedFrame);
+
+ 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;
+ }
+
+ // Create a next-in-flow if needed.
+ if (!NS_FRAME_IS_FULLY_COMPLETE(aStatus)) {
+ CreateNextInFlow(aFrame);
+ }
+
+ 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<nsInlineFrame*>(GetNextInFlow());
+ while (nextInFlow) {
+ if (nextInFlow->mFrames.NotEmpty()) {
+ NS_FRAME_SET_INCOMPLETE(aStatus);
+ break;
+ }
+ nextInFlow = static_cast<nsInlineFrame*>(nextInFlow->GetNextInFlow());
+ }
+ }
+ return;
+ }
+
+ if (!NS_FRAME_IS_FULLY_COMPLETE(aStatus) && !reflowingFirstLetter) {
+ nsIFrame* nextFrame = aFrame->GetNextSibling();
+ if (nextFrame) {
+ PushFrames(aPresContext, nextFrame, aFrame, irs);
+ }
+ }
+}
+
+nsIFrame*
+nsInlineFrame::PullOneFrame(nsPresContext* aPresContext,
+ InlineReflowInput& 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();
+ } 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(frame, nextInFlow, this);
+ break;
+ }
+ nextInFlow = static_cast<nsInlineFrame*>(nextInFlow->GetNextInFlow());
+ irs.mNextInFlow = nextInFlow;
+ }
+
+ *aIsComplete = isComplete;
+ return frame;
+}
+
+void
+nsInlineFrame::PushFrames(nsPresContext* aPresContext,
+ nsIFrame* aFromChild,
+ nsIFrame* aPrevSibling,
+ InlineReflowInput& 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(mFrames.RemoveFramesAfter(aPrevSibling));
+ if (aState.mLineLayout) {
+ aState.mLineLayout->SetDirtyNextLine();
+ }
+}
+
+
+//////////////////////////////////////////////////////////////////////
+
+nsIFrame::LogicalSides
+nsInlineFrame::GetLogicalSkipSides(const ReflowInput* aReflowInput) const
+{
+ if (MOZ_UNLIKELY(StyleBorder()->mBoxDecorationBreak ==
+ StyleBoxDecorationBreak::Clone)) {
+ return LogicalSides();
+ }
+
+ LogicalSides skip;
+ if (!IsFirst()) {
+ 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 start
+ // border edge.
+ skip |= eLogicalSideBitsIStart;
+ }
+ else {
+ // If the prev continuation is empty, then go ahead and let our start
+ // edge border render.
+ }
+ }
+ if (!IsLast()) {
+ 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 end
+ // border edge.
+ skip |= eLogicalSideBitsIEnd;
+ }
+ else {
+ // If the next continuation is empty, then go ahead and let our end
+ // edge border render.
+ }
+ }
+
+ if (GetStateBits() & NS_FRAME_PART_OF_IBSPLIT) {
+ // 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.
+ if (skip != LogicalSides(eLogicalSideBitsIBoth)) {
+ // 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 |= eLogicalSideBitsIEnd;
+ }
+ if (firstContinuation->FrameIsNonFirstInIBSplit()) {
+ skip |= eLogicalSideBitsIStart;
+ }
+ }
+ }
+
+ return skip;
+}
+
+nscoord
+nsInlineFrame::GetLogicalBaseline(mozilla::WritingMode aWritingMode) 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
+ if (mContent->IsHTMLElement(nsGkAtoms::input)) // Broken <input type=image ... />
+ return a11y::eHTMLButtonType;
+ if (mContent->IsHTMLElement(nsGkAtoms::img)) // Create accessible for broken <img>
+ return a11y::eHyperTextType;
+
+ return a11y::eNoType;
+}
+#endif
+
+//////////////////////////////////////////////////////////////////////
+
+// nsLineFrame implementation
+
+nsFirstLineFrame*
+NS_NewFirstLineFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
+{
+ return new (aPresShell) nsFirstLineFrame(aContext);
+}
+
+NS_IMPL_FRAMEARENA_HELPERS(nsFirstLineFrame)
+
+void
+nsFirstLineFrame::Init(nsIContent* aContent,
+ nsContainerFrame* 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();
+ RefPtr<nsStyleContext> newSC = PresContext()->StyleSet()->
+ ResolveAnonymousBoxStyle(nsCSSAnonBoxes::mozLineFrame, parentContext);
+ SetStyleContext(newSC);
+ } else {
+ MOZ_ASSERT(FirstInFlow() != aPrevInFlow);
+ MOZ_ASSERT(aPrevInFlow->StyleContext()->GetPseudo() ==
+ nsCSSAnonBoxes::mozLineFrame);
+ }
+}
+
+#ifdef DEBUG_FRAME_DUMP
+nsresult
+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, InlineReflowInput& 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);
+ nsLayoutUtils::MarkDescendantsDirty(frame);
+ }
+ return frame;
+}
+
+void
+nsFirstLineFrame::Reflow(nsPresContext* aPresContext,
+ ReflowOutput& aMetrics,
+ const ReflowInput& aReflowInput,
+ nsReflowStatus& aStatus)
+{
+ MarkInReflow();
+ if (nullptr == aReflowInput.mLineLayout) {
+ return; // XXX does this happen? why?
+ }
+
+ nsIFrame* lineContainer = aReflowInput.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
+ // aReflowInput)
+ InlineReflowInput irs;
+ irs.mPrevFrame = nullptr;
+ irs.mLineContainer = lineContainer;
+ irs.mLineLayout = aReflowInput.mLineLayout;
+ irs.mNextInFlow = (nsInlineFrame*) GetNextInFlow();
+
+ 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(!aReflowInput.mLineLayout->GetInFirstLine(),
+ "Nested first-line frames? BOGUS");
+ aReflowInput.mLineLayout->SetInFirstLine(true);
+ ReflowFrames(aPresContext, aReflowInput, irs, aMetrics, aStatus);
+ aReflowInput.mLineLayout->SetInFirstLine(false);
+
+ ReflowAbsoluteFrames(aPresContext, aMetrics, aReflowInput, aStatus);
+
+ // Note: the line layout code will properly compute our overflow state for us
+}
+
+/* virtual */ void
+nsFirstLineFrame::PullOverflowsFromPrevInFlow()
+{
+ nsFirstLineFrame* prevInFlow = static_cast<nsFirstLineFrame*>(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) {
+ bool result = !overflowFrames->IsEmpty();
+ const nsFrameList::Slice& newFrames =
+ mFrames.AppendFrames(nullptr, *overflowFrames);
+ ReparentChildListStyle(PresContext(), newFrames, this);
+ return result;
+ }
+ return false;
+}