michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: /* rendering object for CSS display:inline objects */
michael@0: 
michael@0: #include "nsInlineFrame.h"
michael@0: #include "nsLineLayout.h"
michael@0: #include "nsBlockFrame.h"
michael@0: #include "nsPlaceholderFrame.h"
michael@0: #include "nsGkAtoms.h"
michael@0: #include "nsStyleContext.h"
michael@0: #include "nsPresContext.h"
michael@0: #include "nsRenderingContext.h"
michael@0: #include "nsCSSAnonBoxes.h"
michael@0: #include "nsAutoPtr.h"
michael@0: #include "RestyleManager.h"
michael@0: #include "nsDisplayList.h"
michael@0: #include "mozilla/Likely.h"
michael@0: 
michael@0: #ifdef DEBUG
michael@0: #undef NOISY_PUSHING
michael@0: #endif
michael@0: 
michael@0: using namespace mozilla;
michael@0: using namespace mozilla::layout;
michael@0: 
michael@0: 
michael@0: //////////////////////////////////////////////////////////////////////
michael@0: 
michael@0: // Basic nsInlineFrame methods
michael@0: 
michael@0: nsIFrame*
michael@0: NS_NewInlineFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
michael@0: {
michael@0:   return new (aPresShell) nsInlineFrame(aContext);
michael@0: }
michael@0: 
michael@0: NS_IMPL_FRAMEARENA_HELPERS(nsInlineFrame)
michael@0: 
michael@0: NS_QUERYFRAME_HEAD(nsInlineFrame)
michael@0:   NS_QUERYFRAME_ENTRY(nsInlineFrame)
michael@0: NS_QUERYFRAME_TAIL_INHERITING(nsContainerFrame)
michael@0: 
michael@0: #ifdef DEBUG_FRAME_DUMP
michael@0: nsresult
michael@0: nsInlineFrame::GetFrameName(nsAString& aResult) const
michael@0: {
michael@0:   return MakeFrameName(NS_LITERAL_STRING("Inline"), aResult);
michael@0: }
michael@0: #endif
michael@0: 
michael@0: nsIAtom*
michael@0: nsInlineFrame::GetType() const
michael@0: {
michael@0:   return nsGkAtoms::inlineFrame;
michael@0: }
michael@0: 
michael@0: void
michael@0: nsInlineFrame::InvalidateFrame(uint32_t aDisplayItemKey)
michael@0: {
michael@0:   if (IsSVGText()) {
michael@0:     nsIFrame* svgTextFrame =
michael@0:       nsLayoutUtils::GetClosestFrameOfType(GetParent(),
michael@0:                                            nsGkAtoms::svgTextFrame);
michael@0:     svgTextFrame->InvalidateFrame();
michael@0:     return;
michael@0:   }
michael@0:   nsInlineFrameBase::InvalidateFrame(aDisplayItemKey);
michael@0: }
michael@0: 
michael@0: void
michael@0: nsInlineFrame::InvalidateFrameWithRect(const nsRect& aRect, uint32_t aDisplayItemKey)
michael@0: {
michael@0:   if (IsSVGText()) {
michael@0:     nsIFrame* svgTextFrame =
michael@0:       nsLayoutUtils::GetClosestFrameOfType(GetParent(),
michael@0:                                            nsGkAtoms::svgTextFrame);
michael@0:     svgTextFrame->InvalidateFrame();
michael@0:     return;
michael@0:   }
michael@0:   nsInlineFrameBase::InvalidateFrameWithRect(aRect, aDisplayItemKey);
michael@0: }
michael@0: 
michael@0: static inline bool
michael@0: IsMarginZero(const nsStyleCoord &aCoord)
michael@0: {
michael@0:   return aCoord.GetUnit() == eStyleUnit_Auto ||
michael@0:          nsLayoutUtils::IsMarginZero(aCoord);
michael@0: }
michael@0: 
michael@0: /* virtual */ bool
michael@0: nsInlineFrame::IsSelfEmpty()
michael@0: {
michael@0: #if 0
michael@0:   // I used to think inline frames worked this way, but it seems they
michael@0:   // don't.  At least not in our codebase.
michael@0:   if (GetPresContext()->CompatibilityMode() == eCompatibility_FullStandards) {
michael@0:     return false;
michael@0:   }
michael@0: #endif
michael@0:   const nsStyleMargin* margin = StyleMargin();
michael@0:   const nsStyleBorder* border = StyleBorder();
michael@0:   const nsStylePadding* padding = StylePadding();
michael@0:   // XXX Top and bottom removed, since they shouldn't affect things, but this
michael@0:   // doesn't really match with nsLineLayout.cpp's setting of
michael@0:   // ZeroEffectiveSpanBox, anymore, so what should this really be?
michael@0:   bool haveRight =
michael@0:     border->GetComputedBorderWidth(NS_SIDE_RIGHT) != 0 ||
michael@0:     !nsLayoutUtils::IsPaddingZero(padding->mPadding.GetRight()) ||
michael@0:     !IsMarginZero(margin->mMargin.GetRight());
michael@0:   bool haveLeft =
michael@0:     border->GetComputedBorderWidth(NS_SIDE_LEFT) != 0 ||
michael@0:     !nsLayoutUtils::IsPaddingZero(padding->mPadding.GetLeft()) ||
michael@0:     !IsMarginZero(margin->mMargin.GetLeft());
michael@0:   if (haveLeft || haveRight) {
michael@0:     if (GetStateBits() & NS_FRAME_PART_OF_IBSPLIT) {
michael@0:       bool haveStart, haveEnd;
michael@0:       if (NS_STYLE_DIRECTION_LTR == StyleVisibility()->mDirection) {
michael@0:         haveStart = haveLeft;
michael@0:         haveEnd = haveRight;
michael@0:       } else {
michael@0:         haveStart = haveRight;
michael@0:         haveEnd = haveLeft;
michael@0:       }
michael@0:       // For ib-split frames, ignore things we know we'll skip in GetSkipSides.
michael@0:       // XXXbz should we be doing this for non-ib-split frames too, in a more
michael@0:       // general way?
michael@0: 
michael@0:       // Get the first continuation eagerly, as a performance optimization, to
michael@0:       // avoid having to get it twice..
michael@0:       nsIFrame* firstCont = FirstContinuation();
michael@0:       return
michael@0:         (!haveStart || firstCont->FrameIsNonFirstInIBSplit()) &&
michael@0:         (!haveEnd || firstCont->FrameIsNonLastInIBSplit());
michael@0:     }
michael@0:     return false;
michael@0:   }
michael@0:   return true;
michael@0: }
michael@0: 
michael@0: bool
michael@0: nsInlineFrame::IsEmpty()
michael@0: {
michael@0:   if (!IsSelfEmpty()) {
michael@0:     return false;
michael@0:   }
michael@0: 
michael@0:   for (nsIFrame *kid = mFrames.FirstChild(); kid; kid = kid->GetNextSibling()) {
michael@0:     if (!kid->IsEmpty())
michael@0:       return false;
michael@0:   }
michael@0: 
michael@0:   return true;
michael@0: }
michael@0: 
michael@0: nsIFrame::FrameSearchResult
michael@0: nsInlineFrame::PeekOffsetCharacter(bool aForward, int32_t* aOffset,
michael@0:                                    bool aRespectClusters)
michael@0: {
michael@0:   // Override the implementation in nsFrame, to skip empty inline frames
michael@0:   NS_ASSERTION (aOffset && *aOffset <= 1, "aOffset out of range");
michael@0:   int32_t startOffset = *aOffset;
michael@0:   if (startOffset < 0)
michael@0:     startOffset = 1;
michael@0:   if (aForward == (startOffset == 0)) {
michael@0:     // We're before the frame and moving forward, or after it and moving backwards:
michael@0:     // skip to the other side, but keep going.
michael@0:     *aOffset = 1 - startOffset;
michael@0:   }
michael@0:   return CONTINUE;
michael@0: }
michael@0: 
michael@0: void
michael@0: nsInlineFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
michael@0:                                 const nsRect&           aDirtyRect,
michael@0:                                 const nsDisplayListSet& aLists)
michael@0: {
michael@0:   BuildDisplayListForInline(aBuilder, aDirtyRect, aLists);
michael@0: 
michael@0:   // The sole purpose of this is to trigger display of the selection
michael@0:   // window for Named Anchors, which don't have any children and
michael@0:   // normally don't have any size, but in Editor we use CSS to display
michael@0:   // an image to represent this "hidden" element.
michael@0:   if (!mFrames.FirstChild()) {
michael@0:     DisplaySelectionOverlay(aBuilder, aLists.Content());
michael@0:   }
michael@0: }
michael@0: 
michael@0: //////////////////////////////////////////////////////////////////////
michael@0: // Reflow methods
michael@0: 
michael@0: /* virtual */ void
michael@0: nsInlineFrame::AddInlineMinWidth(nsRenderingContext *aRenderingContext,
michael@0:                                  nsIFrame::InlineMinWidthData *aData)
michael@0: {
michael@0:   DoInlineIntrinsicWidth(aRenderingContext, aData, nsLayoutUtils::MIN_WIDTH);
michael@0: }
michael@0: 
michael@0: /* virtual */ void
michael@0: nsInlineFrame::AddInlinePrefWidth(nsRenderingContext *aRenderingContext,
michael@0:                                   nsIFrame::InlinePrefWidthData *aData)
michael@0: {
michael@0:   DoInlineIntrinsicWidth(aRenderingContext, aData, nsLayoutUtils::PREF_WIDTH);
michael@0: }
michael@0: 
michael@0: /* virtual */ nsSize
michael@0: nsInlineFrame::ComputeSize(nsRenderingContext *aRenderingContext,
michael@0:                            nsSize aCBSize, nscoord aAvailableWidth,
michael@0:                            nsSize aMargin, nsSize aBorder, nsSize aPadding,
michael@0:                            uint32_t aFlags)
michael@0: {
michael@0:   // Inlines and text don't compute size before reflow.
michael@0:   return nsSize(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
michael@0: }
michael@0: 
michael@0: nsRect
michael@0: nsInlineFrame::ComputeTightBounds(gfxContext* aContext) const
michael@0: {
michael@0:   // be conservative
michael@0:   if (StyleContext()->HasTextDecorationLines()) {
michael@0:     return GetVisualOverflowRect();
michael@0:   }
michael@0:   return ComputeSimpleTightBounds(aContext);
michael@0: }
michael@0: 
michael@0: void
michael@0: nsInlineFrame::ReparentFloatsForInlineChild(nsIFrame* aOurLineContainer,
michael@0:                                             nsIFrame* aFrame,
michael@0:                                             bool aReparentSiblings)
michael@0: {
michael@0:   // XXXbz this would be better if it took a nsFrameList or a frame
michael@0:   // list slice....
michael@0:   NS_ASSERTION(aOurLineContainer->GetNextContinuation() ||
michael@0:                aOurLineContainer->GetPrevContinuation(),
michael@0:                "Don't call this when we have no continuation, it's a waste");
michael@0:   if (!aFrame) {
michael@0:     NS_ASSERTION(aReparentSiblings, "Why did we get called?");
michael@0:     return;
michael@0:   }
michael@0: 
michael@0:   nsIFrame* ancestor = aFrame;
michael@0:   do {
michael@0:     ancestor = ancestor->GetParent();
michael@0:     if (!ancestor)
michael@0:       return;
michael@0:   } while (!ancestor->IsFloatContainingBlock());
michael@0: 
michael@0:   if (ancestor == aOurLineContainer)
michael@0:     return;
michael@0: 
michael@0:   nsBlockFrame* ourBlock = nsLayoutUtils::GetAsBlock(aOurLineContainer);
michael@0:   NS_ASSERTION(ourBlock, "Not a block, but broke vertically?");
michael@0:   nsBlockFrame* frameBlock = nsLayoutUtils::GetAsBlock(ancestor);
michael@0:   NS_ASSERTION(frameBlock, "ancestor not a block");
michael@0: 
michael@0:   while (true) {
michael@0:     ourBlock->ReparentFloats(aFrame, frameBlock, false);
michael@0: 
michael@0:     if (!aReparentSiblings)
michael@0:       return;
michael@0:     nsIFrame* next = aFrame->GetNextSibling();
michael@0:     if (!next)
michael@0:       return;
michael@0:     if (next->GetParent() == aFrame->GetParent()) {
michael@0:       aFrame = next;
michael@0:       continue;
michael@0:     }
michael@0:     // This is paranoid and will hardly ever get hit ... but we can't actually
michael@0:     // trust that the frames in the sibling chain all have the same parent,
michael@0:     // because lazy reparenting may be going on. If we find a different
michael@0:     // parent we need to redo our analysis.
michael@0:     ReparentFloatsForInlineChild(aOurLineContainer, next, aReparentSiblings);
michael@0:     return;
michael@0:   }
michael@0: }
michael@0: 
michael@0: static void
michael@0: ReparentChildListStyle(nsPresContext* aPresContext,
michael@0:                        const nsFrameList::Slice& aFrames,
michael@0:                        nsIFrame* aParentFrame)
michael@0: {
michael@0:   RestyleManager* restyleManager = aPresContext->RestyleManager();
michael@0: 
michael@0:   for (nsFrameList::Enumerator e(aFrames); !e.AtEnd(); e.Next()) {
michael@0:     NS_ASSERTION(e.get()->GetParent() == aParentFrame, "Bogus parentage");
michael@0:     restyleManager->ReparentStyleContext(e.get());
michael@0:     nsLayoutUtils::MarkDescendantsDirty(e.get());
michael@0:   }
michael@0: }
michael@0: 
michael@0: nsresult
michael@0: nsInlineFrame::Reflow(nsPresContext*          aPresContext,
michael@0:                       nsHTMLReflowMetrics&     aMetrics,
michael@0:                       const nsHTMLReflowState& aReflowState,
michael@0:                       nsReflowStatus&          aStatus)
michael@0: {
michael@0:   DO_GLOBAL_REFLOW_COUNT("nsInlineFrame");
michael@0:   DISPLAY_REFLOW(aPresContext, this, aReflowState, aMetrics, aStatus);
michael@0:   if (nullptr == aReflowState.mLineLayout) {
michael@0:     return NS_ERROR_INVALID_ARG;
michael@0:   }
michael@0:   if (IsFrameTreeTooDeep(aReflowState, aMetrics, aStatus)) {
michael@0:     return NS_OK;
michael@0:   }
michael@0: 
michael@0:   bool    lazilySetParentPointer = false;
michael@0: 
michael@0:   nsIFrame* lineContainer = aReflowState.mLineLayout->LineContainerFrame();
michael@0: 
michael@0:    // Check for an overflow list with our prev-in-flow
michael@0:   nsInlineFrame* prevInFlow = (nsInlineFrame*)GetPrevInFlow();
michael@0:   if (prevInFlow) {
michael@0:     AutoFrameListPtr prevOverflowFrames(aPresContext,
michael@0:                                         prevInFlow->StealOverflowFrames());
michael@0:     if (prevOverflowFrames) {
michael@0:       // When pushing and pulling frames we need to check for whether any
michael@0:       // views need to be reparented.
michael@0:       nsContainerFrame::ReparentFrameViewList(*prevOverflowFrames, prevInFlow,
michael@0:                                               this);
michael@0: 
michael@0:       // Check if we should do the lazilySetParentPointer optimization.
michael@0:       // Only do it in simple cases where we're being reflowed for the
michael@0:       // first time, nothing (e.g. bidi resolution) has already given
michael@0:       // us children, and there's no next-in-flow, so all our frames
michael@0:       // will be taken from prevOverflowFrames.
michael@0:       if ((GetStateBits() & NS_FRAME_FIRST_REFLOW) && mFrames.IsEmpty() &&
michael@0:           !GetNextInFlow()) {
michael@0:         // If our child list is empty, just put the new frames into it.
michael@0:         // Note that we don't set the parent pointer for the new frames. Instead wait
michael@0:         // to do this until we actually reflow the frame. If the overflow list contains
michael@0:         // thousands of frames this is a big performance issue (see bug #5588)
michael@0:         mFrames.SetFrames(*prevOverflowFrames);
michael@0:         lazilySetParentPointer = true;
michael@0:       } else {
michael@0:         // Assign all floats to our block if necessary
michael@0:         if (lineContainer && lineContainer->GetPrevContinuation()) {
michael@0:           ReparentFloatsForInlineChild(lineContainer,
michael@0:                                        prevOverflowFrames->FirstChild(),
michael@0:                                        true);
michael@0:         }
michael@0:         // Insert the new frames at the beginning of the child list
michael@0:         // and set their parent pointer
michael@0:         const nsFrameList::Slice& newFrames =
michael@0:           mFrames.InsertFrames(this, nullptr, *prevOverflowFrames);
michael@0:         // If our prev in flow was under the first continuation of a first-line
michael@0:         // frame then we need to reparent the style contexts to remove the
michael@0:         // the special first-line styling. In the lazilySetParentPointer case
michael@0:         // we reparent the style contexts when we set their parents in
michael@0:         // nsInlineFrame::ReflowFrames and nsInlineFrame::ReflowInlineFrame.
michael@0:         if (aReflowState.mLineLayout->GetInFirstLine()) {
michael@0:           ReparentChildListStyle(aPresContext, newFrames, this);
michael@0:         }
michael@0:       }
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   // It's also possible that we have an overflow list for ourselves
michael@0: #ifdef DEBUG
michael@0:   if (GetStateBits() & NS_FRAME_FIRST_REFLOW) {
michael@0:     // If it's our initial reflow, then we should not have an overflow list.
michael@0:     // However, add an assertion in case we get reflowed more than once with
michael@0:     // the initial reflow reason
michael@0:     nsFrameList* overflowFrames = GetOverflowFrames();
michael@0:     NS_ASSERTION(!overflowFrames || overflowFrames->IsEmpty(),
michael@0:                  "overflow list is not empty for initial reflow");
michael@0:   }
michael@0: #endif
michael@0:   if (!(GetStateBits() & NS_FRAME_FIRST_REFLOW)) {
michael@0:     DrainFlags flags =
michael@0:       lazilySetParentPointer ? eDontReparentFrames : DrainFlags(0);
michael@0:     if (aReflowState.mLineLayout->GetInFirstLine()) {
michael@0:       flags = DrainFlags(flags | eInFirstLine);
michael@0:     }
michael@0:     DrainSelfOverflowListInternal(flags, lineContainer);
michael@0:   }
michael@0: 
michael@0:   // Set our own reflow state (additional state above and beyond
michael@0:   // aReflowState)
michael@0:   InlineReflowState irs;
michael@0:   irs.mPrevFrame = nullptr;
michael@0:   irs.mLineContainer = lineContainer;
michael@0:   irs.mLineLayout = aReflowState.mLineLayout;
michael@0:   irs.mNextInFlow = (nsInlineFrame*) GetNextInFlow();
michael@0:   irs.mSetParentPointer = lazilySetParentPointer;
michael@0: 
michael@0:   nsresult rv;
michael@0:   if (mFrames.IsEmpty()) {
michael@0:     // Try to pull over one frame before starting so that we know
michael@0:     // whether we have an anonymous block or not.
michael@0:     bool complete;
michael@0:     (void) PullOneFrame(aPresContext, irs, &complete);
michael@0:   }
michael@0: 
michael@0:   rv = ReflowFrames(aPresContext, aReflowState, irs, aMetrics, aStatus);
michael@0: 
michael@0:   ReflowAbsoluteFrames(aPresContext, aMetrics, aReflowState, aStatus);
michael@0: 
michael@0:   // Note: the line layout code will properly compute our
michael@0:   // overflow-rect state for us.
michael@0: 
michael@0:   NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aMetrics);
michael@0:   return rv;
michael@0: }
michael@0: 
michael@0: bool
michael@0: nsInlineFrame::DrainSelfOverflowListInternal(DrainFlags aFlags,
michael@0:                                              nsIFrame* aLineContainer)
michael@0: {
michael@0:   AutoFrameListPtr overflowFrames(PresContext(), StealOverflowFrames());
michael@0:   if (overflowFrames) {
michael@0:     NS_ASSERTION(mFrames.NotEmpty(), "overflow list w/o frames");
michael@0:     // The frames on our own overflowlist may have been pushed by a
michael@0:     // previous lazilySetParentPointer Reflow so we need to ensure the
michael@0:     // correct parent pointer.  This is sometimes skipped by Reflow.
michael@0:     if (!(aFlags & eDontReparentFrames)) {
michael@0:       nsIFrame* firstChild = overflowFrames->FirstChild();
michael@0:       if (aLineContainer && aLineContainer->GetPrevContinuation()) {
michael@0:         ReparentFloatsForInlineChild(aLineContainer, firstChild, true);
michael@0:       }
michael@0:       const bool inFirstLine = (aFlags & eInFirstLine);
michael@0:       RestyleManager* restyleManager = PresContext()->RestyleManager();
michael@0:       for (nsIFrame* f = firstChild; f; f = f->GetNextSibling()) {
michael@0:         f->SetParent(this);
michael@0:         if (inFirstLine) {
michael@0:           restyleManager->ReparentStyleContext(f);
michael@0:           nsLayoutUtils::MarkDescendantsDirty(f);
michael@0:         }
michael@0:       }
michael@0:     }
michael@0:     bool result = !overflowFrames->IsEmpty();
michael@0:     mFrames.AppendFrames(nullptr, *overflowFrames);
michael@0:     return result;
michael@0:   }
michael@0:   return false;
michael@0: }
michael@0: 
michael@0: /* virtual */ bool
michael@0: nsInlineFrame::DrainSelfOverflowList()
michael@0: {
michael@0:   nsIFrame* lineContainer = nsLayoutUtils::FindNearestBlockAncestor(this);
michael@0:   // Add the eInFirstLine flag if we have a ::first-line ancestor frame.
michael@0:   // No need to look further than the nearest line container though.
michael@0:   DrainFlags flags = DrainFlags(0);
michael@0:   for (nsIFrame* p = GetParent(); p != lineContainer; p = p->GetParent()) {
michael@0:     if (p->GetType() == nsGkAtoms::lineFrame) {
michael@0:       flags = DrainFlags(flags | eInFirstLine);
michael@0:       break;
michael@0:     }
michael@0:   }
michael@0:   return DrainSelfOverflowListInternal(flags, lineContainer);
michael@0: }
michael@0: 
michael@0: /* virtual */ bool
michael@0: nsInlineFrame::CanContinueTextRun() const
michael@0: {
michael@0:   // We can continue a text run through an inline frame
michael@0:   return true;
michael@0: }
michael@0: 
michael@0: /* virtual */ void
michael@0: nsInlineFrame::PullOverflowsFromPrevInFlow()
michael@0: {
michael@0:   nsInlineFrame* prevInFlow = static_cast<nsInlineFrame*>(GetPrevInFlow());
michael@0:   if (prevInFlow) {
michael@0:     nsPresContext* presContext = PresContext();
michael@0:     AutoFrameListPtr prevOverflowFrames(presContext,
michael@0:                                         prevInFlow->StealOverflowFrames());
michael@0:     if (prevOverflowFrames) {
michael@0:       // Assume that our prev-in-flow has the same line container that we do.
michael@0:       nsContainerFrame::ReparentFrameViewList(*prevOverflowFrames, prevInFlow,
michael@0:                                               this);
michael@0:       mFrames.InsertFrames(this, nullptr, *prevOverflowFrames);
michael@0:     }
michael@0:   }
michael@0: }
michael@0: 
michael@0: nsresult
michael@0: nsInlineFrame::ReflowFrames(nsPresContext* aPresContext,
michael@0:                             const nsHTMLReflowState& aReflowState,
michael@0:                             InlineReflowState& irs,
michael@0:                             nsHTMLReflowMetrics& aMetrics,
michael@0:                             nsReflowStatus& aStatus)
michael@0: {
michael@0:   nsresult rv = NS_OK;
michael@0:   aStatus = NS_FRAME_COMPLETE;
michael@0: 
michael@0:   nsLineLayout* lineLayout = aReflowState.mLineLayout;
michael@0:   bool inFirstLine = aReflowState.mLineLayout->GetInFirstLine();
michael@0:   RestyleManager* restyleManager = aPresContext->RestyleManager();
michael@0:   WritingMode wm = aReflowState.GetWritingMode();
michael@0:   nscoord startEdge = 0;
michael@0:   // Don't offset by our start borderpadding if we have a prev continuation or
michael@0:   // if we're in a part of an {ib} split other than the first one.
michael@0:   if (!GetPrevContinuation() && !FrameIsNonFirstInIBSplit()) {
michael@0:     startEdge = aReflowState.ComputedLogicalBorderPadding().IStart(wm);
michael@0:   }
michael@0:   nscoord availableISize = aReflowState.AvailableISize();
michael@0:   NS_ASSERTION(availableISize != NS_UNCONSTRAINEDSIZE,
michael@0:                "should no longer use available widths");
michael@0:   // Subtract off inline axis border+padding from availableISize
michael@0:   availableISize -= startEdge;
michael@0:   availableISize -= aReflowState.ComputedLogicalBorderPadding().IEnd(wm);
michael@0:   lineLayout->BeginSpan(this, &aReflowState, startEdge,
michael@0:                         startEdge + availableISize, &mBaseline);
michael@0: 
michael@0:   // First reflow our principal children.
michael@0:   nsIFrame* frame = mFrames.FirstChild();
michael@0:   bool done = false;
michael@0:   while (frame) {
michael@0:     // Check if we should lazily set the child frame's parent pointer.
michael@0:     if (irs.mSetParentPointer) {
michael@0:       bool havePrevBlock =
michael@0:         irs.mLineContainer && irs.mLineContainer->GetPrevContinuation();
michael@0:       nsIFrame* child = frame;
michael@0:       do {
michael@0:         // If our block is the first in flow, then any floats under the pulled
michael@0:         // frame must already belong to our block.
michael@0:         if (havePrevBlock) {
michael@0:           // This has to happen before we update frame's parent; we need to
michael@0:           // know frame's ancestry under its old block.
michael@0:           // The blockChildren.ContainsFrame check performed by
michael@0:           // ReparentFloatsForInlineChild here may be slow, but we can't
michael@0:           // easily avoid it because we don't know where 'frame' originally
michael@0:           // came from. If we really really have to optimize this we could
michael@0:           // cache whether frame->GetParent() is under its containing blocks
michael@0:           // overflowList or not.
michael@0:           ReparentFloatsForInlineChild(irs.mLineContainer, child, false);
michael@0:         }
michael@0:         child->SetParent(this);
michael@0:         if (inFirstLine) {
michael@0:           restyleManager->ReparentStyleContext(child);
michael@0:           nsLayoutUtils::MarkDescendantsDirty(child);
michael@0:         }
michael@0:         // We also need to do the same for |frame|'s next-in-flows that are in
michael@0:         // the sibling list. Otherwise, if we reflow |frame| and it's complete
michael@0:         // we'll crash when trying to delete its next-in-flow.
michael@0:         // This scenario doesn't happen often, but it can happen.
michael@0:         nsIFrame* nextSibling = child->GetNextSibling();
michael@0:         child = child->GetNextInFlow();
michael@0:         if (MOZ_UNLIKELY(child)) {
michael@0:           while (child != nextSibling && nextSibling) {
michael@0:             nextSibling = nextSibling->GetNextSibling();
michael@0:           }
michael@0:           if (!nextSibling) {
michael@0:             child = nullptr;
michael@0:           }
michael@0:         }
michael@0:         MOZ_ASSERT(!child || mFrames.ContainsFrame(child));
michael@0:       } while (child);
michael@0: 
michael@0:       // Fix the parent pointer for ::first-letter child frame next-in-flows,
michael@0:       // so nsFirstLetterFrame::Reflow can destroy them safely (bug 401042).
michael@0:       nsIFrame* realFrame = nsPlaceholderFrame::GetRealFrameFor(frame);
michael@0:       if (realFrame->GetType() == nsGkAtoms::letterFrame) {
michael@0:         nsIFrame* child = realFrame->GetFirstPrincipalChild();
michael@0:         if (child) {
michael@0:           NS_ASSERTION(child->GetType() == nsGkAtoms::textFrame,
michael@0:                        "unexpected frame type");
michael@0:           nsIFrame* nextInFlow = child->GetNextInFlow();
michael@0:           for ( ; nextInFlow; nextInFlow = nextInFlow->GetNextInFlow()) {
michael@0:             NS_ASSERTION(nextInFlow->GetType() == nsGkAtoms::textFrame,
michael@0:                          "unexpected frame type");
michael@0:             if (mFrames.ContainsFrame(nextInFlow)) {
michael@0:               nextInFlow->SetParent(this);
michael@0:               if (inFirstLine) {
michael@0:                 restyleManager->ReparentStyleContext(nextInFlow);
michael@0:                 nsLayoutUtils::MarkDescendantsDirty(nextInFlow);
michael@0:               }
michael@0:             }
michael@0:             else {
michael@0: #ifdef DEBUG              
michael@0:               // Once we find a next-in-flow that isn't ours none of the
michael@0:               // remaining next-in-flows should be either.
michael@0:               for ( ; nextInFlow; nextInFlow = nextInFlow->GetNextInFlow()) {
michael@0:                 NS_ASSERTION(!mFrames.ContainsFrame(nextInFlow),
michael@0:                              "unexpected letter frame flow");
michael@0:               }
michael@0: #endif
michael@0:               break;
michael@0:             }
michael@0:           }
michael@0:         }
michael@0:       }
michael@0:     }
michael@0:     MOZ_ASSERT(frame->GetParent() == this);
michael@0: 
michael@0:     if (!done) {
michael@0:       bool reflowingFirstLetter = lineLayout->GetFirstLetterStyleOK();
michael@0:       rv = ReflowInlineFrame(aPresContext, aReflowState, irs, frame, aStatus);
michael@0:       done = NS_FAILED(rv) ||
michael@0:              NS_INLINE_IS_BREAK(aStatus) || 
michael@0:              (!reflowingFirstLetter && NS_FRAME_IS_NOT_COMPLETE(aStatus));
michael@0:       if (done) {
michael@0:         if (!irs.mSetParentPointer) {
michael@0:           break;
michael@0:         }
michael@0:         // Keep reparenting the remaining siblings, but don't reflow them.
michael@0:         nsFrameList* pushedFrames = GetOverflowFrames();
michael@0:         if (pushedFrames && pushedFrames->FirstChild() == frame) {
michael@0:           // Don't bother if |frame| was pushed to our overflow list.
michael@0:           break;
michael@0:         }
michael@0:       } else {
michael@0:         irs.mPrevFrame = frame;
michael@0:       }
michael@0:     }
michael@0:     frame = frame->GetNextSibling();
michael@0:   }
michael@0: 
michael@0:   // Attempt to pull frames from our next-in-flow until we can't
michael@0:   if (!done && GetNextInFlow()) {
michael@0:     while (true) {
michael@0:       bool reflowingFirstLetter = lineLayout->GetFirstLetterStyleOK();
michael@0:       bool isComplete;
michael@0:       if (!frame) { // Could be non-null if we pulled a first-letter frame and
michael@0:                     // it created a continuation, since we don't push those.
michael@0:         frame = PullOneFrame(aPresContext, irs, &isComplete);
michael@0:       }
michael@0: #ifdef NOISY_PUSHING
michael@0:       printf("%p pulled up %p\n", this, frame);
michael@0: #endif
michael@0:       if (nullptr == frame) {
michael@0:         if (!isComplete) {
michael@0:           aStatus = NS_FRAME_NOT_COMPLETE;
michael@0:         }
michael@0:         break;
michael@0:       }
michael@0:       rv = ReflowInlineFrame(aPresContext, aReflowState, irs, frame, aStatus);
michael@0:       if (NS_FAILED(rv) ||
michael@0:           NS_INLINE_IS_BREAK(aStatus) || 
michael@0:           (!reflowingFirstLetter && NS_FRAME_IS_NOT_COMPLETE(aStatus))) {
michael@0:         break;
michael@0:       }
michael@0:       irs.mPrevFrame = frame;
michael@0:       frame = frame->GetNextSibling();
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   NS_ASSERTION(!NS_FRAME_IS_COMPLETE(aStatus) || !GetOverflowFrames(),
michael@0:                "We can't be complete AND have overflow frames!");
michael@0: 
michael@0:   // If after reflowing our children they take up no area then make
michael@0:   // sure that we don't either.
michael@0:   //
michael@0:   // Note: CSS demands that empty inline elements still affect the
michael@0:   // line-height calculations. However, continuations of an inline
michael@0:   // that are empty we force to empty so that things like collapsed
michael@0:   // whitespace in an inline element don't affect the line-height.
michael@0:   aMetrics.ISize() = lineLayout->EndSpan(this);
michael@0: 
michael@0:   // Compute final width.
michael@0: 
michael@0:   // Make sure to not include our start border and padding if we have a prev
michael@0:   // continuation or if we're in a part of an {ib} split other than the first
michael@0:   // one.
michael@0:   if (!GetPrevContinuation() && !FrameIsNonFirstInIBSplit()) {
michael@0:     aMetrics.ISize() += aReflowState.ComputedLogicalBorderPadding().IStart(wm);
michael@0:   }
michael@0: 
michael@0:   /*
michael@0:    * We want to only apply the end border and padding if we're the last
michael@0:    * continuation and either not in an {ib} split or the last part of it.  To
michael@0:    * be the last continuation we have to be complete (so that we won't get a
michael@0:    * next-in-flow) and have no non-fluid continuations on our continuation
michael@0:    * chain.
michael@0:    */
michael@0:   if (NS_FRAME_IS_COMPLETE(aStatus) &&
michael@0:       !LastInFlow()->GetNextContinuation() &&
michael@0:       !FrameIsNonLastInIBSplit()) {
michael@0:     aMetrics.Width() += aReflowState.ComputedLogicalBorderPadding().IEnd(wm);
michael@0:   }
michael@0: 
michael@0:   nsRefPtr<nsFontMetrics> fm;
michael@0:   float inflation = nsLayoutUtils::FontSizeInflationFor(this);
michael@0:   nsLayoutUtils::GetFontMetricsForFrame(this, getter_AddRefs(fm), inflation);
michael@0:   aReflowState.rendContext->SetFont(fm);
michael@0: 
michael@0:   if (fm) {
michael@0:     // Compute final height of the frame.
michael@0:     //
michael@0:     // Do things the standard css2 way -- though it's hard to find it
michael@0:     // in the css2 spec! It's actually found in the css1 spec section
michael@0:     // 4.4 (you will have to read between the lines to really see
michael@0:     // it).
michael@0:     //
michael@0:     // The height of our box is the sum of our font size plus the top
michael@0:     // and bottom border and padding. The height of children do not
michael@0:     // affect our height.
michael@0:     aMetrics.SetTopAscent(fm->MaxAscent());
michael@0:     aMetrics.Height() = fm->MaxHeight();
michael@0:   } else {
michael@0:     NS_WARNING("Cannot get font metrics - defaulting sizes to 0");
michael@0:     aMetrics.SetTopAscent(aMetrics.Height() = 0);
michael@0:   }
michael@0:   aMetrics.SetTopAscent(aMetrics.TopAscent() + aReflowState.ComputedPhysicalBorderPadding().top);
michael@0:   aMetrics.Height() += aReflowState.ComputedPhysicalBorderPadding().top +
michael@0:     aReflowState.ComputedPhysicalBorderPadding().bottom;
michael@0: 
michael@0:   // For now our overflow area is zero. The real value will be
michael@0:   // computed in |nsLineLayout::RelativePositionFrames|.
michael@0:   aMetrics.mOverflowAreas.Clear();
michael@0: 
michael@0: #ifdef NOISY_FINAL_SIZE
michael@0:   ListTag(stdout);
michael@0:   printf(": metrics=%d,%d ascent=%d\n",
michael@0:          aMetrics.Width(), aMetrics.Height(), aMetrics.TopAscent());
michael@0: #endif
michael@0: 
michael@0:   return rv;
michael@0: }
michael@0: 
michael@0: nsresult
michael@0: nsInlineFrame::ReflowInlineFrame(nsPresContext* aPresContext,
michael@0:                                  const nsHTMLReflowState& aReflowState,
michael@0:                                  InlineReflowState& irs,
michael@0:                                  nsIFrame* aFrame,
michael@0:                                  nsReflowStatus& aStatus)
michael@0: {
michael@0:   nsLineLayout* lineLayout = aReflowState.mLineLayout;
michael@0:   bool reflowingFirstLetter = lineLayout->GetFirstLetterStyleOK();
michael@0:   bool pushedFrame;
michael@0:   nsresult rv =
michael@0:     lineLayout->ReflowFrame(aFrame, aStatus, nullptr, pushedFrame);
michael@0:   
michael@0:   if (NS_FAILED(rv)) {
michael@0:     return rv;
michael@0:   }
michael@0: 
michael@0:   if (NS_INLINE_IS_BREAK_BEFORE(aStatus)) {
michael@0:     if (aFrame != mFrames.FirstChild()) {
michael@0:       // Change break-before status into break-after since we have
michael@0:       // already placed at least one child frame. This preserves the
michael@0:       // break-type so that it can be propagated upward.
michael@0:       aStatus = NS_FRAME_NOT_COMPLETE |
michael@0:         NS_INLINE_BREAK | NS_INLINE_BREAK_AFTER |
michael@0:         (aStatus & NS_INLINE_BREAK_TYPE_MASK);
michael@0:       PushFrames(aPresContext, aFrame, irs.mPrevFrame, irs);
michael@0:     }
michael@0:     else {
michael@0:       // Preserve reflow status when breaking-before our first child
michael@0:       // and propagate it upward without modification.
michael@0:     }
michael@0:     return NS_OK;
michael@0:   }
michael@0: 
michael@0:   // Create a next-in-flow if needed.
michael@0:   if (!NS_FRAME_IS_FULLY_COMPLETE(aStatus)) {
michael@0:     nsIFrame* newFrame;
michael@0:     rv = CreateNextInFlow(aFrame, newFrame);
michael@0:     if (NS_FAILED(rv)) {
michael@0:       return rv;
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   if (NS_INLINE_IS_BREAK_AFTER(aStatus)) {
michael@0:     nsIFrame* nextFrame = aFrame->GetNextSibling();
michael@0:     if (nextFrame) {
michael@0:       NS_FRAME_SET_INCOMPLETE(aStatus);
michael@0:       PushFrames(aPresContext, nextFrame, aFrame, irs);
michael@0:     }
michael@0:     else {
michael@0:       // We must return an incomplete status if there are more child
michael@0:       // frames remaining in a next-in-flow that follows this frame.
michael@0:       nsInlineFrame* nextInFlow = static_cast<nsInlineFrame*>(GetNextInFlow());
michael@0:       while (nextInFlow) {
michael@0:         if (nextInFlow->mFrames.NotEmpty()) {
michael@0:           NS_FRAME_SET_INCOMPLETE(aStatus);
michael@0:           break;
michael@0:         }
michael@0:         nextInFlow = static_cast<nsInlineFrame*>(nextInFlow->GetNextInFlow());
michael@0:       }
michael@0:     }
michael@0:     return NS_OK;
michael@0:   }
michael@0: 
michael@0:   if (!NS_FRAME_IS_FULLY_COMPLETE(aStatus) && !reflowingFirstLetter) {
michael@0:     nsIFrame* nextFrame = aFrame->GetNextSibling();
michael@0:     if (nextFrame) {
michael@0:       PushFrames(aPresContext, nextFrame, aFrame, irs);
michael@0:     }
michael@0:   }
michael@0:   return NS_OK;
michael@0: }
michael@0: 
michael@0: nsIFrame*
michael@0: nsInlineFrame::PullOneFrame(nsPresContext* aPresContext,
michael@0:                             InlineReflowState& irs,
michael@0:                             bool* aIsComplete)
michael@0: {
michael@0:   bool isComplete = true;
michael@0: 
michael@0:   nsIFrame* frame = nullptr;
michael@0:   nsInlineFrame* nextInFlow = irs.mNextInFlow;
michael@0:   while (nextInFlow) {
michael@0:     frame = nextInFlow->mFrames.FirstChild();
michael@0:     if (!frame) {
michael@0:       // The nextInFlow's principal list has no frames, try its overflow list.
michael@0:       nsFrameList* overflowFrames = nextInFlow->GetOverflowFrames();
michael@0:       if (overflowFrames) {
michael@0:         frame = overflowFrames->RemoveFirstChild();
michael@0:         if (overflowFrames->IsEmpty()) {
michael@0:           // We're stealing the only frame - delete the overflow list.
michael@0:           nextInFlow->DestroyOverflowList();
michael@0:         } else {
michael@0:           // We leave the remaining frames on the overflow list (rather than
michael@0:           // putting them on nextInFlow's principal list) so we don't have to
michael@0:           // set up the parent for them.
michael@0:         }
michael@0:         // ReparentFloatsForInlineChild needs it to be on a child list -
michael@0:         // we remove it again below.
michael@0:         nextInFlow->mFrames.SetFrames(frame);
michael@0:       }
michael@0:     }
michael@0: 
michael@0:     if (frame) {
michael@0:       // If our block has no next continuation, then any floats belonging to
michael@0:       // the pulled frame must belong to our block already. This check ensures
michael@0:       // we do no extra work in the common non-vertical-breaking case.
michael@0:       if (irs.mLineContainer && irs.mLineContainer->GetNextContinuation()) {
michael@0:         // The blockChildren.ContainsFrame check performed by
michael@0:         // ReparentFloatsForInlineChild will be fast because frame's ancestor
michael@0:         // will be the first child of its containing block.
michael@0:         ReparentFloatsForInlineChild(irs.mLineContainer, frame, false);
michael@0:       }
michael@0:       nextInFlow->mFrames.RemoveFirstChild();
michael@0:       // nsFirstLineFrame::PullOneFrame calls ReparentStyleContext.
michael@0: 
michael@0:       mFrames.InsertFrame(this, irs.mPrevFrame, frame);
michael@0:       isComplete = false;
michael@0:       if (irs.mLineLayout) {
michael@0:         irs.mLineLayout->SetDirtyNextLine();
michael@0:       }
michael@0:       nsContainerFrame::ReparentFrameView(frame, nextInFlow, this);
michael@0:       break;
michael@0:     }
michael@0:     nextInFlow = static_cast<nsInlineFrame*>(nextInFlow->GetNextInFlow());
michael@0:     irs.mNextInFlow = nextInFlow;
michael@0:   }
michael@0: 
michael@0:   *aIsComplete = isComplete;
michael@0:   return frame;
michael@0: }
michael@0: 
michael@0: void
michael@0: nsInlineFrame::PushFrames(nsPresContext* aPresContext,
michael@0:                           nsIFrame* aFromChild,
michael@0:                           nsIFrame* aPrevSibling,
michael@0:                           InlineReflowState& aState)
michael@0: {
michael@0:   NS_PRECONDITION(aFromChild, "null pointer");
michael@0:   NS_PRECONDITION(aPrevSibling, "pushing first child");
michael@0:   NS_PRECONDITION(aPrevSibling->GetNextSibling() == aFromChild, "bad prev sibling");
michael@0: 
michael@0: #ifdef NOISY_PUSHING
michael@0:   printf("%p pushing aFromChild %p, disconnecting from prev sib %p\n", 
michael@0:          this, aFromChild, aPrevSibling);
michael@0: #endif
michael@0: 
michael@0:   // Add the frames to our overflow list (let our next in flow drain
michael@0:   // our overflow list when it is ready)
michael@0:   SetOverflowFrames(mFrames.RemoveFramesAfter(aPrevSibling));
michael@0:   if (aState.mLineLayout) {
michael@0:     aState.mLineLayout->SetDirtyNextLine();
michael@0:   }
michael@0: }
michael@0: 
michael@0: 
michael@0: //////////////////////////////////////////////////////////////////////
michael@0: 
michael@0: int
michael@0: nsInlineFrame::GetLogicalSkipSides(const nsHTMLReflowState* aReflowState) const
michael@0: {
michael@0:   int skip = 0;
michael@0:   if (!IsFirst()) {
michael@0:     nsInlineFrame* prev = (nsInlineFrame*) GetPrevContinuation();
michael@0:     if ((GetStateBits() & NS_INLINE_FRAME_BIDI_VISUAL_STATE_IS_SET) ||
michael@0:         (prev && (prev->mRect.height || prev->mRect.width))) {
michael@0:       // Prev continuation is not empty therefore we don't render our start
michael@0:       // border edge.
michael@0:       skip |= LOGICAL_SIDE_I_START;
michael@0:     }
michael@0:     else {
michael@0:       // If the prev continuation is empty, then go ahead and let our start
michael@0:       // edge border render.
michael@0:     }
michael@0:   }
michael@0:   if (!IsLast()) {
michael@0:     nsInlineFrame* next = (nsInlineFrame*) GetNextContinuation();
michael@0:     if ((GetStateBits() & NS_INLINE_FRAME_BIDI_VISUAL_STATE_IS_SET) ||
michael@0:         (next && (next->mRect.height || next->mRect.width))) {
michael@0:       // Next continuation is not empty therefore we don't render our end
michael@0:       // border edge.
michael@0:       skip |= LOGICAL_SIDE_I_END;
michael@0:     }
michael@0:     else {
michael@0:       // If the next continuation is empty, then go ahead and let our end
michael@0:       // edge border render.
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   if (GetStateBits() & NS_FRAME_PART_OF_IBSPLIT) {
michael@0:     // All but the last part of an {ib} split should skip the "end" side (as
michael@0:     // determined by this frame's direction) and all but the first part of such
michael@0:     // a split should skip the "start" side.  But figuring out which part of
michael@0:     // the split we are involves getting our first continuation, which might be
michael@0:     // expensive.  So don't bother if we already have the relevant bits set.
michael@0:     if (skip != LOGICAL_SIDES_I_BOTH) {
michael@0:       // We're missing one of the skip bits, so check whether we need to set it.
michael@0:       // Only get the first continuation once, as an optimization.
michael@0:       nsIFrame* firstContinuation = FirstContinuation();
michael@0:       if (firstContinuation->FrameIsNonLastInIBSplit()) {
michael@0:         skip |= LOGICAL_SIDE_I_END;
michael@0:       }
michael@0:       if (firstContinuation->FrameIsNonFirstInIBSplit()) {
michael@0:         skip |= LOGICAL_SIDE_I_START;
michael@0:       }
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   return skip;
michael@0: }
michael@0: 
michael@0: nscoord
michael@0: nsInlineFrame::GetBaseline() const
michael@0: {
michael@0:   return mBaseline;
michael@0: }
michael@0: 
michael@0: #ifdef ACCESSIBILITY
michael@0: a11y::AccType
michael@0: nsInlineFrame::AccessibleType()
michael@0: {
michael@0:   // Broken image accessibles are created here, because layout
michael@0:   // replaces the image or image control frame with an inline frame
michael@0:   nsIAtom *tagAtom = mContent->Tag();
michael@0:   if (tagAtom == nsGkAtoms::input)  // Broken <input type=image ... />
michael@0:     return a11y::eHTMLButtonType;
michael@0:   if (tagAtom == nsGkAtoms::img)  // Create accessible for broken <img>
michael@0:     return a11y::eHyperTextType;
michael@0: 
michael@0:   return a11y::eNoType;
michael@0: }
michael@0: #endif
michael@0: 
michael@0: //////////////////////////////////////////////////////////////////////
michael@0: 
michael@0: // nsLineFrame implementation
michael@0: 
michael@0: nsIFrame*
michael@0: NS_NewFirstLineFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
michael@0: {
michael@0:   return new (aPresShell) nsFirstLineFrame(aContext);
michael@0: }
michael@0: 
michael@0: NS_IMPL_FRAMEARENA_HELPERS(nsFirstLineFrame)
michael@0: 
michael@0: void
michael@0: nsFirstLineFrame::Init(nsIContent* aContent, nsIFrame* aParent,
michael@0:                        nsIFrame* aPrevInFlow)
michael@0: {
michael@0:   nsInlineFrame::Init(aContent, aParent, aPrevInFlow);
michael@0:   if (!aPrevInFlow) {
michael@0:     MOZ_ASSERT(StyleContext()->GetPseudo() == nsCSSPseudoElements::firstLine);
michael@0:     return;
michael@0:   }
michael@0: 
michael@0:   // This frame is a continuation - fixup the style context if aPrevInFlow
michael@0:   // is the first-in-flow (the only one with a ::first-line pseudo).
michael@0:   if (aPrevInFlow->StyleContext()->GetPseudo() == nsCSSPseudoElements::firstLine) {
michael@0:     MOZ_ASSERT(FirstInFlow() == aPrevInFlow);
michael@0:     // Create a new style context that is a child of the parent
michael@0:     // style context thus removing the ::first-line style. This way
michael@0:     // we behave as if an anonymous (unstyled) span was the child
michael@0:     // of the parent frame.
michael@0:     nsStyleContext* parentContext = aParent->StyleContext();
michael@0:     nsRefPtr<nsStyleContext> newSC = PresContext()->StyleSet()->
michael@0:       ResolveAnonymousBoxStyle(nsCSSAnonBoxes::mozLineFrame, parentContext);
michael@0:     SetStyleContext(newSC);
michael@0:   } else {
michael@0:     MOZ_ASSERT(FirstInFlow() != aPrevInFlow);
michael@0:     MOZ_ASSERT(aPrevInFlow->StyleContext()->GetPseudo() ==
michael@0:                  nsCSSAnonBoxes::mozLineFrame);
michael@0:   }
michael@0: }
michael@0: 
michael@0: #ifdef DEBUG_FRAME_DUMP
michael@0: nsresult
michael@0: nsFirstLineFrame::GetFrameName(nsAString& aResult) const
michael@0: {
michael@0:   return MakeFrameName(NS_LITERAL_STRING("Line"), aResult);
michael@0: }
michael@0: #endif
michael@0: 
michael@0: nsIAtom*
michael@0: nsFirstLineFrame::GetType() const
michael@0: {
michael@0:   return nsGkAtoms::lineFrame;
michael@0: }
michael@0: 
michael@0: nsIFrame*
michael@0: nsFirstLineFrame::PullOneFrame(nsPresContext* aPresContext, InlineReflowState& irs,
michael@0:                                bool* aIsComplete)
michael@0: {
michael@0:   nsIFrame* frame = nsInlineFrame::PullOneFrame(aPresContext, irs, aIsComplete);
michael@0:   if (frame && !GetPrevInFlow()) {
michael@0:     // We are a first-line frame. Fixup the child frames
michael@0:     // style-context that we just pulled.
michael@0:     NS_ASSERTION(frame->GetParent() == this, "Incorrect parent?");
michael@0:     aPresContext->RestyleManager()->ReparentStyleContext(frame);
michael@0:     nsLayoutUtils::MarkDescendantsDirty(frame);
michael@0:   }
michael@0:   return frame;
michael@0: }
michael@0: 
michael@0: nsresult
michael@0: nsFirstLineFrame::Reflow(nsPresContext* aPresContext,
michael@0:                          nsHTMLReflowMetrics& aMetrics,
michael@0:                          const nsHTMLReflowState& aReflowState,
michael@0:                          nsReflowStatus& aStatus)
michael@0: {
michael@0:   if (nullptr == aReflowState.mLineLayout) {
michael@0:     return NS_ERROR_INVALID_ARG;
michael@0:   }
michael@0: 
michael@0:   nsIFrame* lineContainer = aReflowState.mLineLayout->LineContainerFrame();
michael@0: 
michael@0:   // Check for an overflow list with our prev-in-flow
michael@0:   nsFirstLineFrame* prevInFlow = (nsFirstLineFrame*)GetPrevInFlow();
michael@0:   if (prevInFlow) {
michael@0:     AutoFrameListPtr prevOverflowFrames(aPresContext,
michael@0:                                         prevInFlow->StealOverflowFrames());
michael@0:     if (prevOverflowFrames) {
michael@0:       // Assign all floats to our block if necessary
michael@0:       if (lineContainer && lineContainer->GetPrevContinuation()) {
michael@0:         ReparentFloatsForInlineChild(lineContainer,
michael@0:                                      prevOverflowFrames->FirstChild(),
michael@0:                                      true);
michael@0:       }
michael@0:       const nsFrameList::Slice& newFrames =
michael@0:         mFrames.InsertFrames(this, nullptr, *prevOverflowFrames);
michael@0:       ReparentChildListStyle(aPresContext, newFrames, this);
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   // It's also possible that we have an overflow list for ourselves.
michael@0:   DrainSelfOverflowList();
michael@0: 
michael@0:   // Set our own reflow state (additional state above and beyond
michael@0:   // aReflowState)
michael@0:   InlineReflowState irs;
michael@0:   irs.mPrevFrame = nullptr;
michael@0:   irs.mLineContainer = lineContainer;
michael@0:   irs.mLineLayout = aReflowState.mLineLayout;
michael@0:   irs.mNextInFlow = (nsInlineFrame*) GetNextInFlow();
michael@0: 
michael@0:   nsresult rv;
michael@0:   bool wasEmpty = mFrames.IsEmpty();
michael@0:   if (wasEmpty) {
michael@0:     // Try to pull over one frame before starting so that we know
michael@0:     // whether we have an anonymous block or not.
michael@0:     bool complete;
michael@0:     PullOneFrame(aPresContext, irs, &complete);
michael@0:   }
michael@0: 
michael@0:   if (nullptr == GetPrevInFlow()) {
michael@0:     // XXX This is pretty sick, but what we do here is to pull-up, in
michael@0:     // advance, all of the next-in-flows children. We re-resolve their
michael@0:     // style while we are at at it so that when we reflow they have
michael@0:     // the right style.
michael@0:     //
michael@0:     // All of this is so that text-runs reflow properly.
michael@0:     irs.mPrevFrame = mFrames.LastChild();
michael@0:     for (;;) {
michael@0:       bool complete;
michael@0:       nsIFrame* frame = PullOneFrame(aPresContext, irs, &complete);
michael@0:       if (!frame) {
michael@0:         break;
michael@0:       }
michael@0:       irs.mPrevFrame = frame;
michael@0:     }
michael@0:     irs.mPrevFrame = nullptr;
michael@0:   }
michael@0: 
michael@0:   NS_ASSERTION(!aReflowState.mLineLayout->GetInFirstLine(),
michael@0:                "Nested first-line frames? BOGUS");
michael@0:   aReflowState.mLineLayout->SetInFirstLine(true);
michael@0:   rv = ReflowFrames(aPresContext, aReflowState, irs, aMetrics, aStatus);
michael@0:   aReflowState.mLineLayout->SetInFirstLine(false);
michael@0: 
michael@0:   ReflowAbsoluteFrames(aPresContext, aMetrics, aReflowState, aStatus);
michael@0: 
michael@0:   // Note: the line layout code will properly compute our overflow state for us
michael@0: 
michael@0:   return rv;
michael@0: }
michael@0: 
michael@0: /* virtual */ void
michael@0: nsFirstLineFrame::PullOverflowsFromPrevInFlow()
michael@0: {
michael@0:   nsFirstLineFrame* prevInFlow = static_cast<nsFirstLineFrame*>(GetPrevInFlow());
michael@0:   if (prevInFlow) {
michael@0:     nsPresContext* presContext = PresContext();
michael@0:     AutoFrameListPtr prevOverflowFrames(presContext,
michael@0:                                         prevInFlow->StealOverflowFrames());
michael@0:     if (prevOverflowFrames) {
michael@0:       // Assume that our prev-in-flow has the same line container that we do.
michael@0:       const nsFrameList::Slice& newFrames =
michael@0:         mFrames.InsertFrames(this, nullptr, *prevOverflowFrames);
michael@0:       ReparentChildListStyle(presContext, newFrames, this);
michael@0:     }
michael@0:   }
michael@0: }
michael@0: 
michael@0: /* virtual */ bool
michael@0: nsFirstLineFrame::DrainSelfOverflowList()
michael@0: {
michael@0:   AutoFrameListPtr overflowFrames(PresContext(), StealOverflowFrames());
michael@0:   if (overflowFrames) {
michael@0:     NS_ASSERTION(mFrames.NotEmpty(), "overflow list w/o frames");
michael@0: 
michael@0:     bool result = !overflowFrames->IsEmpty();
michael@0:     const nsFrameList::Slice& newFrames =
michael@0:       mFrames.AppendFrames(nullptr, *overflowFrames);
michael@0:     ReparentChildListStyle(PresContext(), newFrames, this);
michael@0:     return result;
michael@0:   }
michael@0:   return false;
michael@0: }