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Diffstat (limited to 'layout/generic/TextOverflow.cpp')
| -rw-r--r-- | layout/generic/TextOverflow.cpp | 837 |
1 files changed, 837 insertions, 0 deletions
diff --git a/layout/generic/TextOverflow.cpp b/layout/generic/TextOverflow.cpp new file mode 100644 index 000000000..b4d935fbf --- /dev/null +++ b/layout/generic/TextOverflow.cpp @@ -0,0 +1,837 @@ +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set shiftwidth=2 tabstop=8 autoindent cindent expandtab: */ +/* 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/. */ + +#include "TextOverflow.h" +#include <algorithm> + +// Please maintain alphabetical order below +#include "nsBlockFrame.h" +#include "nsCaret.h" +#include "nsContentUtils.h" +#include "nsCSSAnonBoxes.h" +#include "nsFontMetrics.h" +#include "nsGfxScrollFrame.h" +#include "nsIScrollableFrame.h" +#include "nsLayoutUtils.h" +#include "nsPresContext.h" +#include "nsRect.h" +#include "nsRenderingContext.h" +#include "nsTextFrame.h" +#include "nsIFrameInlines.h" +#include "mozilla/ArrayUtils.h" +#include "mozilla/Likely.h" +#include "nsISelection.h" + +namespace mozilla { +namespace css { + +class LazyReferenceRenderingDrawTargetGetterFromFrame final : + public gfxFontGroup::LazyReferenceDrawTargetGetter { +public: + typedef mozilla::gfx::DrawTarget DrawTarget; + + explicit LazyReferenceRenderingDrawTargetGetterFromFrame(nsIFrame* aFrame) + : mFrame(aFrame) {} + virtual already_AddRefed<DrawTarget> GetRefDrawTarget() override + { + RefPtr<gfxContext> ctx = + mFrame->PresContext()->PresShell()->CreateReferenceRenderingContext(); + RefPtr<DrawTarget> dt = ctx->GetDrawTarget(); + return dt.forget(); + } +private: + nsIFrame* mFrame; +}; + +static gfxTextRun* +GetEllipsisTextRun(nsIFrame* aFrame) +{ + RefPtr<nsFontMetrics> fm = + nsLayoutUtils::GetInflatedFontMetricsForFrame(aFrame); + LazyReferenceRenderingDrawTargetGetterFromFrame lazyRefDrawTargetGetter(aFrame); + return fm->GetThebesFontGroup()->GetEllipsisTextRun( + aFrame->PresContext()->AppUnitsPerDevPixel(), + nsLayoutUtils::GetTextRunOrientFlagsForStyle(aFrame->StyleContext()), + lazyRefDrawTargetGetter); +} + +static nsIFrame* +GetSelfOrNearestBlock(nsIFrame* aFrame) +{ + return nsLayoutUtils::GetAsBlock(aFrame) ? aFrame : + nsLayoutUtils::FindNearestBlockAncestor(aFrame); +} + +// Return true if the frame is an atomic inline-level element. +// It's not supposed to be called for block frames since we never +// process block descendants for text-overflow. +static bool +IsAtomicElement(nsIFrame* aFrame, const nsIAtom* aFrameType) +{ + NS_PRECONDITION(!nsLayoutUtils::GetAsBlock(aFrame) || + !aFrame->IsBlockOutside(), + "unexpected block frame"); + NS_PRECONDITION(aFrameType != nsGkAtoms::placeholderFrame, + "unexpected placeholder frame"); + return !aFrame->IsFrameOfType(nsIFrame::eLineParticipant); +} + +static bool +IsFullyClipped(nsTextFrame* aFrame, nscoord aLeft, nscoord aRight, + nscoord* aSnappedLeft, nscoord* aSnappedRight) +{ + *aSnappedLeft = aLeft; + *aSnappedRight = aRight; + if (aLeft <= 0 && aRight <= 0) { + return false; + } + return !aFrame->MeasureCharClippedText(aLeft, aRight, + aSnappedLeft, aSnappedRight); +} + +static bool +IsInlineAxisOverflowVisible(nsIFrame* aFrame) +{ + NS_PRECONDITION(nsLayoutUtils::GetAsBlock(aFrame) != nullptr, + "expected a block frame"); + + nsIFrame* f = aFrame; + while (f && f->StyleContext()->GetPseudo() && + f->GetType() != nsGkAtoms::scrollFrame) { + f = f->GetParent(); + } + if (!f) { + return true; + } + auto overflow = aFrame->GetWritingMode().IsVertical() ? + f->StyleDisplay()->mOverflowY : f->StyleDisplay()->mOverflowX; + return overflow == NS_STYLE_OVERFLOW_VISIBLE; +} + +static void +ClipMarker(const nsRect& aContentArea, + const nsRect& aMarkerRect, + DisplayListClipState::AutoSaveRestore& aClipState) +{ + nscoord rightOverflow = aMarkerRect.XMost() - aContentArea.XMost(); + nsRect markerRect = aMarkerRect; + if (rightOverflow > 0) { + // Marker overflows on the right side (content width < marker width). + markerRect.width -= rightOverflow; + aClipState.ClipContentDescendants(markerRect); + } else { + nscoord leftOverflow = aContentArea.x - aMarkerRect.x; + if (leftOverflow > 0) { + // Marker overflows on the left side + markerRect.width -= leftOverflow; + markerRect.x += leftOverflow; + aClipState.ClipContentDescendants(markerRect); + } + } +} + +static void +InflateIStart(WritingMode aWM, LogicalRect* aRect, nscoord aDelta) +{ + nscoord iend = aRect->IEnd(aWM); + aRect->IStart(aWM) -= aDelta; + aRect->ISize(aWM) = std::max(iend - aRect->IStart(aWM), 0); +} + +static void +InflateIEnd(WritingMode aWM, LogicalRect* aRect, nscoord aDelta) +{ + aRect->ISize(aWM) = std::max(aRect->ISize(aWM) + aDelta, 0); +} + +static bool +IsFrameDescendantOfAny(nsIFrame* aChild, + const TextOverflow::FrameHashtable& aSetOfFrames, + nsIFrame* aCommonAncestor) +{ + for (nsIFrame* f = aChild; f && f != aCommonAncestor; + f = nsLayoutUtils::GetCrossDocParentFrame(f)) { + if (aSetOfFrames.GetEntry(f)) { + return true; + } + } + return false; +} + +class nsDisplayTextOverflowMarker : public nsDisplayItem +{ +public: + nsDisplayTextOverflowMarker(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame, + const nsRect& aRect, nscoord aAscent, + const nsStyleTextOverflowSide* aStyle, + uint32_t aIndex) + : nsDisplayItem(aBuilder, aFrame), mRect(aRect), + mStyle(aStyle), mAscent(aAscent), mIndex(aIndex) { + MOZ_COUNT_CTOR(nsDisplayTextOverflowMarker); + } +#ifdef NS_BUILD_REFCNT_LOGGING + virtual ~nsDisplayTextOverflowMarker() { + MOZ_COUNT_DTOR(nsDisplayTextOverflowMarker); + } +#endif + virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder, + bool* aSnap) override { + *aSnap = false; + nsRect shadowRect = + nsLayoutUtils::GetTextShadowRectsUnion(mRect, mFrame); + return mRect.Union(shadowRect); + } + + virtual nsRect GetComponentAlphaBounds(nsDisplayListBuilder* aBuilder) override + { + if (gfxPlatform::GetPlatform()->RespectsFontStyleSmoothing()) { + // On OS X, web authors can turn off subpixel text rendering using the + // CSS property -moz-osx-font-smoothing. If they do that, we don't need + // to use component alpha layers for the affected text. + if (mFrame->StyleFont()->mFont.smoothing == NS_FONT_SMOOTHING_GRAYSCALE) { + return nsRect(); + } + } + bool snap; + return GetBounds(aBuilder, &snap); + } + + virtual void Paint(nsDisplayListBuilder* aBuilder, + nsRenderingContext* aCtx) override; + + virtual uint32_t GetPerFrameKey() override { + return (mIndex << nsDisplayItem::TYPE_BITS) | nsDisplayItem::GetPerFrameKey(); + } + void PaintTextToContext(nsRenderingContext* aCtx, + nsPoint aOffsetFromRect); + NS_DISPLAY_DECL_NAME("TextOverflow", TYPE_TEXT_OVERFLOW) +private: + nsRect mRect; // in reference frame coordinates + const nsStyleTextOverflowSide* mStyle; + nscoord mAscent; // baseline for the marker text in mRect + uint32_t mIndex; +}; + +static void +PaintTextShadowCallback(nsRenderingContext* aCtx, + nsPoint aShadowOffset, + const nscolor& aShadowColor, + void* aData) +{ + reinterpret_cast<nsDisplayTextOverflowMarker*>(aData)-> + PaintTextToContext(aCtx, aShadowOffset); +} + +void +nsDisplayTextOverflowMarker::Paint(nsDisplayListBuilder* aBuilder, + nsRenderingContext* aCtx) +{ + nscolor foregroundColor = nsLayoutUtils:: + GetColor(mFrame, eCSSProperty__webkit_text_fill_color); + + // Paint the text-shadows for the overflow marker + nsLayoutUtils::PaintTextShadow(mFrame, aCtx, mRect, mVisibleRect, + foregroundColor, PaintTextShadowCallback, + (void*)this); + aCtx->ThebesContext()->SetColor(gfx::Color::FromABGR(foregroundColor)); + PaintTextToContext(aCtx, nsPoint(0, 0)); +} + +void +nsDisplayTextOverflowMarker::PaintTextToContext(nsRenderingContext* aCtx, + nsPoint aOffsetFromRect) +{ + WritingMode wm = mFrame->GetWritingMode(); + nsPoint pt(mRect.x, mRect.y); + if (wm.IsVertical()) { + if (wm.IsVerticalLR()) { + pt.x = NSToCoordFloor(nsLayoutUtils::GetSnappedBaselineX( + mFrame, aCtx->ThebesContext(), pt.x, mAscent)); + } else { + pt.x = NSToCoordFloor(nsLayoutUtils::GetSnappedBaselineX( + mFrame, aCtx->ThebesContext(), pt.x + mRect.width, -mAscent)); + } + } else { + pt.y = NSToCoordFloor(nsLayoutUtils::GetSnappedBaselineY( + mFrame, aCtx->ThebesContext(), pt.y, mAscent)); + } + pt += aOffsetFromRect; + + if (mStyle->mType == NS_STYLE_TEXT_OVERFLOW_ELLIPSIS) { + gfxTextRun* textRun = GetEllipsisTextRun(mFrame); + if (textRun) { + NS_ASSERTION(!textRun->IsRightToLeft(), + "Ellipsis textruns should always be LTR!"); + gfxPoint gfxPt(pt.x, pt.y); + textRun->Draw(gfxTextRun::Range(textRun), gfxPt, + gfxTextRun::DrawParams(aCtx->ThebesContext())); + } + } else { + RefPtr<nsFontMetrics> fm = + nsLayoutUtils::GetInflatedFontMetricsForFrame(mFrame); + nsLayoutUtils::DrawString(mFrame, *fm, aCtx, mStyle->mString.get(), + mStyle->mString.Length(), pt); + } +} + +TextOverflow::TextOverflow(nsDisplayListBuilder* aBuilder, + nsIFrame* aBlockFrame) + : mContentArea(aBlockFrame->GetWritingMode(), + aBlockFrame->GetContentRectRelativeToSelf(), + aBlockFrame->GetSize()) + , mBuilder(aBuilder) + , mBlock(aBlockFrame) + , mScrollableFrame(nsLayoutUtils::GetScrollableFrameFor(aBlockFrame)) + , mBlockSize(aBlockFrame->GetSize()) + , mBlockWM(aBlockFrame->GetWritingMode()) + , mAdjustForPixelSnapping(false) +{ +#ifdef MOZ_XUL + if (!mScrollableFrame) { + nsIAtom* pseudoType = aBlockFrame->StyleContext()->GetPseudo(); + if (pseudoType == nsCSSAnonBoxes::mozXULAnonymousBlock) { + mScrollableFrame = + nsLayoutUtils::GetScrollableFrameFor(aBlockFrame->GetParent()); + // nsXULScrollFrame::ClampAndSetBounds rounds to nearest pixels + // for RTL blocks (also for overflow:hidden), so we need to move + // the edges 1px outward in ExamineLineFrames to avoid triggering + // a text-overflow marker in this case. + mAdjustForPixelSnapping = !mBlockWM.IsBidiLTR(); + } + } +#endif + mCanHaveInlineAxisScrollbar = false; + if (mScrollableFrame) { + auto scrollbarStyle = mBlockWM.IsVertical() ? + mScrollableFrame->GetScrollbarStyles().mVertical : + mScrollableFrame->GetScrollbarStyles().mHorizontal; + mCanHaveInlineAxisScrollbar = scrollbarStyle != NS_STYLE_OVERFLOW_HIDDEN; + if (!mAdjustForPixelSnapping) { + // Scrolling to the end position can leave some text still overflowing due + // to pixel snapping behaviour in our scrolling code. + mAdjustForPixelSnapping = mCanHaveInlineAxisScrollbar; + } + // Use a null containerSize to convert a vector from logical to physical. + const nsSize nullContainerSize; + mContentArea.MoveBy(mBlockWM, + LogicalPoint(mBlockWM, + mScrollableFrame->GetScrollPosition(), + nullContainerSize)); + nsIFrame* scrollFrame = do_QueryFrame(mScrollableFrame); + scrollFrame->AddStateBits(NS_SCROLLFRAME_INVALIDATE_CONTENTS_ON_SCROLL); + } + uint8_t direction = aBlockFrame->StyleVisibility()->mDirection; + const nsStyleTextReset* style = aBlockFrame->StyleTextReset(); + if (mBlockWM.IsBidiLTR()) { + mIStart.Init(style->mTextOverflow.GetLeft(direction)); + mIEnd.Init(style->mTextOverflow.GetRight(direction)); + } else { + mIStart.Init(style->mTextOverflow.GetRight(direction)); + mIEnd.Init(style->mTextOverflow.GetLeft(direction)); + } + // The left/right marker string is setup in ExamineLineFrames when a line + // has overflow on that side. +} + +/* static */ TextOverflow* +TextOverflow::WillProcessLines(nsDisplayListBuilder* aBuilder, + nsIFrame* aBlockFrame) +{ + if (!CanHaveTextOverflow(aBuilder, aBlockFrame)) { + return nullptr; + } + nsIScrollableFrame* scrollableFrame = nsLayoutUtils::GetScrollableFrameFor(aBlockFrame); + if (scrollableFrame && scrollableFrame->IsTransformingByAPZ()) { + // If the APZ is actively scrolling this, don't bother with markers. + return nullptr; + } + return new TextOverflow(aBuilder, aBlockFrame); +} + +void +TextOverflow::ExamineFrameSubtree(nsIFrame* aFrame, + const LogicalRect& aContentArea, + const LogicalRect& aInsideMarkersArea, + FrameHashtable* aFramesToHide, + AlignmentEdges* aAlignmentEdges, + bool* aFoundVisibleTextOrAtomic, + InnerClipEdges* aClippedMarkerEdges) +{ + const nsIAtom* frameType = aFrame->GetType(); + if (frameType == nsGkAtoms::brFrame || + frameType == nsGkAtoms::placeholderFrame) { + return; + } + const bool isAtomic = IsAtomicElement(aFrame, frameType); + if (aFrame->StyleVisibility()->IsVisible()) { + LogicalRect childRect = + GetLogicalScrollableOverflowRectRelativeToBlock(aFrame); + bool overflowIStart = + childRect.IStart(mBlockWM) < aContentArea.IStart(mBlockWM); + bool overflowIEnd = + childRect.IEnd(mBlockWM) > aContentArea.IEnd(mBlockWM); + if (overflowIStart) { + mIStart.mHasOverflow = true; + } + if (overflowIEnd) { + mIEnd.mHasOverflow = true; + } + if (isAtomic && ((mIStart.mActive && overflowIStart) || + (mIEnd.mActive && overflowIEnd))) { + aFramesToHide->PutEntry(aFrame); + } else if (isAtomic || frameType == nsGkAtoms::textFrame) { + AnalyzeMarkerEdges(aFrame, frameType, aInsideMarkersArea, + aFramesToHide, aAlignmentEdges, + aFoundVisibleTextOrAtomic, + aClippedMarkerEdges); + } + } + if (isAtomic) { + return; + } + + for (nsIFrame* child : aFrame->PrincipalChildList()) { + ExamineFrameSubtree(child, aContentArea, aInsideMarkersArea, + aFramesToHide, aAlignmentEdges, + aFoundVisibleTextOrAtomic, + aClippedMarkerEdges); + } +} + +void +TextOverflow::AnalyzeMarkerEdges(nsIFrame* aFrame, + const nsIAtom* aFrameType, + const LogicalRect& aInsideMarkersArea, + FrameHashtable* aFramesToHide, + AlignmentEdges* aAlignmentEdges, + bool* aFoundVisibleTextOrAtomic, + InnerClipEdges* aClippedMarkerEdges) +{ + LogicalRect borderRect(mBlockWM, + nsRect(aFrame->GetOffsetTo(mBlock), + aFrame->GetSize()), + mBlockSize); + nscoord istartOverlap = std::max( + aInsideMarkersArea.IStart(mBlockWM) - borderRect.IStart(mBlockWM), 0); + nscoord iendOverlap = std::max( + borderRect.IEnd(mBlockWM) - aInsideMarkersArea.IEnd(mBlockWM), 0); + bool insideIStartEdge = + aInsideMarkersArea.IStart(mBlockWM) <= borderRect.IEnd(mBlockWM); + bool insideIEndEdge = + borderRect.IStart(mBlockWM) <= aInsideMarkersArea.IEnd(mBlockWM); + + if (istartOverlap > 0) { + aClippedMarkerEdges->AccumulateIStart(mBlockWM, borderRect); + if (!mIStart.mActive) { + istartOverlap = 0; + } + } + if (iendOverlap > 0) { + aClippedMarkerEdges->AccumulateIEnd(mBlockWM, borderRect); + if (!mIEnd.mActive) { + iendOverlap = 0; + } + } + + if ((istartOverlap > 0 && insideIStartEdge) || + (iendOverlap > 0 && insideIEndEdge)) { + if (aFrameType == nsGkAtoms::textFrame) { + if (aInsideMarkersArea.IStart(mBlockWM) < + aInsideMarkersArea.IEnd(mBlockWM)) { + // a clipped text frame and there is some room between the markers + nscoord snappedIStart, snappedIEnd; + auto textFrame = static_cast<nsTextFrame*>(aFrame); + bool isFullyClipped = mBlockWM.IsBidiLTR() ? + IsFullyClipped(textFrame, istartOverlap, iendOverlap, + &snappedIStart, &snappedIEnd) : + IsFullyClipped(textFrame, iendOverlap, istartOverlap, + &snappedIEnd, &snappedIStart); + if (!isFullyClipped) { + LogicalRect snappedRect = borderRect; + if (istartOverlap > 0) { + snappedRect.IStart(mBlockWM) += snappedIStart; + snappedRect.ISize(mBlockWM) -= snappedIStart; + } + if (iendOverlap > 0) { + snappedRect.ISize(mBlockWM) -= snappedIEnd; + } + aAlignmentEdges->Accumulate(mBlockWM, snappedRect); + *aFoundVisibleTextOrAtomic = true; + } + } + } else { + aFramesToHide->PutEntry(aFrame); + } + } else if (!insideIStartEdge || !insideIEndEdge) { + // frame is outside + if (IsAtomicElement(aFrame, aFrameType)) { + aFramesToHide->PutEntry(aFrame); + } + } else { + // frame is inside + aAlignmentEdges->Accumulate(mBlockWM, borderRect); + *aFoundVisibleTextOrAtomic = true; + } +} + +void +TextOverflow::ExamineLineFrames(nsLineBox* aLine, + FrameHashtable* aFramesToHide, + AlignmentEdges* aAlignmentEdges) +{ + // No ellipsing for 'clip' style. + bool suppressIStart = mIStart.mStyle->mType == NS_STYLE_TEXT_OVERFLOW_CLIP; + bool suppressIEnd = mIEnd.mStyle->mType == NS_STYLE_TEXT_OVERFLOW_CLIP; + if (mCanHaveInlineAxisScrollbar) { + LogicalPoint pos(mBlockWM, mScrollableFrame->GetScrollPosition(), + mBlockSize); + LogicalRect scrollRange(mBlockWM, mScrollableFrame->GetScrollRange(), + mBlockSize); + // No ellipsing when nothing to scroll to on that side (this includes + // overflow:auto that doesn't trigger a horizontal scrollbar). + if (pos.I(mBlockWM) <= scrollRange.IStart(mBlockWM)) { + suppressIStart = true; + } + if (pos.I(mBlockWM) >= scrollRange.IEnd(mBlockWM)) { + suppressIEnd = true; + } + } + + LogicalRect contentArea = mContentArea; + const nscoord scrollAdjust = mAdjustForPixelSnapping ? + mBlock->PresContext()->AppUnitsPerDevPixel() : 0; + InflateIStart(mBlockWM, &contentArea, scrollAdjust); + InflateIEnd(mBlockWM, &contentArea, scrollAdjust); + LogicalRect lineRect(mBlockWM, aLine->GetScrollableOverflowArea(), + mBlockSize); + const bool istartOverflow = + !suppressIStart && lineRect.IStart(mBlockWM) < contentArea.IStart(mBlockWM); + const bool iendOverflow = + !suppressIEnd && lineRect.IEnd(mBlockWM) > contentArea.IEnd(mBlockWM); + if (!istartOverflow && !iendOverflow) { + // The line does not overflow on a side we should ellipsize. + return; + } + + int pass = 0; + bool retryEmptyLine = true; + bool guessIStart = istartOverflow; + bool guessIEnd = iendOverflow; + mIStart.mActive = istartOverflow; + mIEnd.mActive = iendOverflow; + bool clippedIStartMarker = false; + bool clippedIEndMarker = false; + do { + // Setup marker strings as needed. + if (guessIStart) { + mIStart.SetupString(mBlock); + } + if (guessIEnd) { + mIEnd.SetupString(mBlock); + } + + // If there is insufficient space for both markers then keep the one on the + // end side per the block's 'direction'. + nscoord istartMarkerISize = mIStart.mActive ? mIStart.mISize : 0; + nscoord iendMarkerISize = mIEnd.mActive ? mIEnd.mISize : 0; + if (istartMarkerISize && iendMarkerISize && + istartMarkerISize + iendMarkerISize > contentArea.ISize(mBlockWM)) { + istartMarkerISize = 0; + } + + // Calculate the area between the potential markers aligned at the + // block's edge. + LogicalRect insideMarkersArea = mContentArea; + if (guessIStart) { + InflateIStart(mBlockWM, &insideMarkersArea, -istartMarkerISize); + } + if (guessIEnd) { + InflateIEnd(mBlockWM, &insideMarkersArea, -iendMarkerISize); + } + + // Analyze the frames on aLine for the overflow situation at the content + // edges and at the edges of the area between the markers. + bool foundVisibleTextOrAtomic = false; + int32_t n = aLine->GetChildCount(); + nsIFrame* child = aLine->mFirstChild; + InnerClipEdges clippedMarkerEdges; + for (; n-- > 0; child = child->GetNextSibling()) { + ExamineFrameSubtree(child, contentArea, insideMarkersArea, + aFramesToHide, aAlignmentEdges, + &foundVisibleTextOrAtomic, + &clippedMarkerEdges); + } + if (!foundVisibleTextOrAtomic && retryEmptyLine) { + aAlignmentEdges->mAssigned = false; + aFramesToHide->Clear(); + pass = -1; + if (mIStart.IsNeeded() && mIStart.mActive && !clippedIStartMarker) { + if (clippedMarkerEdges.mAssignedIStart && + clippedMarkerEdges.mIStart > mContentArea.IStart(mBlockWM)) { + mIStart.mISize = + clippedMarkerEdges.mIStart - mContentArea.IStart(mBlockWM); + NS_ASSERTION(mIStart.mISize < mIStart.mIntrinsicISize, + "clipping a marker should make it strictly smaller"); + clippedIStartMarker = true; + } else { + mIStart.mActive = guessIStart = false; + } + continue; + } + if (mIEnd.IsNeeded() && mIEnd.mActive && !clippedIEndMarker) { + if (clippedMarkerEdges.mAssignedIEnd && + mContentArea.IEnd(mBlockWM) > clippedMarkerEdges.mIEnd) { + mIEnd.mISize = mContentArea.IEnd(mBlockWM) - clippedMarkerEdges.mIEnd; + NS_ASSERTION(mIEnd.mISize < mIEnd.mIntrinsicISize, + "clipping a marker should make it strictly smaller"); + clippedIEndMarker = true; + } else { + mIEnd.mActive = guessIEnd = false; + } + continue; + } + // The line simply has no visible content even without markers, + // so examine the line again without suppressing markers. + retryEmptyLine = false; + mIStart.mISize = mIStart.mIntrinsicISize; + mIStart.mActive = guessIStart = istartOverflow; + mIEnd.mISize = mIEnd.mIntrinsicISize; + mIEnd.mActive = guessIEnd = iendOverflow; + continue; + } + if (guessIStart == (mIStart.mActive && mIStart.IsNeeded()) && + guessIEnd == (mIEnd.mActive && mIEnd.IsNeeded())) { + break; + } else { + guessIStart = mIStart.mActive && mIStart.IsNeeded(); + guessIEnd = mIEnd.mActive && mIEnd.IsNeeded(); + mIStart.Reset(); + mIEnd.Reset(); + aFramesToHide->Clear(); + } + NS_ASSERTION(pass == 0, "2nd pass should never guess wrong"); + } while (++pass != 2); + if (!istartOverflow || !mIStart.mActive) { + mIStart.Reset(); + } + if (!iendOverflow || !mIEnd.mActive) { + mIEnd.Reset(); + } +} + +void +TextOverflow::ProcessLine(const nsDisplayListSet& aLists, + nsLineBox* aLine) +{ + NS_ASSERTION(mIStart.mStyle->mType != NS_STYLE_TEXT_OVERFLOW_CLIP || + mIEnd.mStyle->mType != NS_STYLE_TEXT_OVERFLOW_CLIP, + "TextOverflow with 'clip' for both sides"); + mIStart.Reset(); + mIStart.mActive = mIStart.mStyle->mType != NS_STYLE_TEXT_OVERFLOW_CLIP; + mIEnd.Reset(); + mIEnd.mActive = mIEnd.mStyle->mType != NS_STYLE_TEXT_OVERFLOW_CLIP; + + FrameHashtable framesToHide(64); + AlignmentEdges alignmentEdges; + ExamineLineFrames(aLine, &framesToHide, &alignmentEdges); + bool needIStart = mIStart.IsNeeded(); + bool needIEnd = mIEnd.IsNeeded(); + if (!needIStart && !needIEnd) { + return; + } + NS_ASSERTION(mIStart.mStyle->mType != NS_STYLE_TEXT_OVERFLOW_CLIP || + !needIStart, "left marker for 'clip'"); + NS_ASSERTION(mIEnd.mStyle->mType != NS_STYLE_TEXT_OVERFLOW_CLIP || + !needIEnd, "right marker for 'clip'"); + + // If there is insufficient space for both markers then keep the one on the + // end side per the block's 'direction'. + if (needIStart && needIEnd && + mIStart.mISize + mIEnd.mISize > mContentArea.ISize(mBlockWM)) { + needIStart = false; + } + LogicalRect insideMarkersArea = mContentArea; + if (needIStart) { + InflateIStart(mBlockWM, &insideMarkersArea, -mIStart.mISize); + } + if (needIEnd) { + InflateIEnd(mBlockWM, &insideMarkersArea, -mIEnd.mISize); + } + if (!mCanHaveInlineAxisScrollbar && alignmentEdges.mAssigned) { + LogicalRect alignmentRect(mBlockWM, alignmentEdges.mIStart, + insideMarkersArea.BStart(mBlockWM), + alignmentEdges.ISize(), 1); + insideMarkersArea.IntersectRect(insideMarkersArea, alignmentRect); + } + + // Clip and remove display items as needed at the final marker edges. + nsDisplayList* lists[] = { aLists.Content(), aLists.PositionedDescendants() }; + for (uint32_t i = 0; i < ArrayLength(lists); ++i) { + PruneDisplayListContents(lists[i], framesToHide, insideMarkersArea); + } + CreateMarkers(aLine, needIStart, needIEnd, insideMarkersArea); +} + +void +TextOverflow::PruneDisplayListContents(nsDisplayList* aList, + const FrameHashtable& aFramesToHide, + const LogicalRect& aInsideMarkersArea) +{ + nsDisplayList saved; + nsDisplayItem* item; + while ((item = aList->RemoveBottom())) { + nsIFrame* itemFrame = item->Frame(); + if (IsFrameDescendantOfAny(itemFrame, aFramesToHide, mBlock)) { + item->~nsDisplayItem(); + continue; + } + + nsDisplayList* wrapper = item->GetSameCoordinateSystemChildren(); + if (wrapper) { + if (!itemFrame || GetSelfOrNearestBlock(itemFrame) == mBlock) { + PruneDisplayListContents(wrapper, aFramesToHide, aInsideMarkersArea); + } + } + + nsCharClipDisplayItem* charClip = itemFrame ? + nsCharClipDisplayItem::CheckCast(item) : nullptr; + if (charClip && GetSelfOrNearestBlock(itemFrame) == mBlock) { + LogicalRect rect = + GetLogicalScrollableOverflowRectRelativeToBlock(itemFrame); + if (mIStart.IsNeeded()) { + nscoord istart = + aInsideMarkersArea.IStart(mBlockWM) - rect.IStart(mBlockWM); + if (istart > 0) { + (mBlockWM.IsBidiLTR() ? + charClip->mVisIStartEdge : charClip->mVisIEndEdge) = istart; + } + } + if (mIEnd.IsNeeded()) { + nscoord iend = rect.IEnd(mBlockWM) - aInsideMarkersArea.IEnd(mBlockWM); + if (iend > 0) { + (mBlockWM.IsBidiLTR() ? + charClip->mVisIEndEdge : charClip->mVisIStartEdge) = iend; + } + } + } + + saved.AppendToTop(item); + } + aList->AppendToTop(&saved); +} + +/* static */ bool +TextOverflow::HasClippedOverflow(nsIFrame* aBlockFrame) +{ + const nsStyleTextReset* style = aBlockFrame->StyleTextReset(); + return style->mTextOverflow.mLeft.mType == NS_STYLE_TEXT_OVERFLOW_CLIP && + style->mTextOverflow.mRight.mType == NS_STYLE_TEXT_OVERFLOW_CLIP; +} + +/* static */ bool +TextOverflow::CanHaveTextOverflow(nsDisplayListBuilder* aBuilder, + nsIFrame* aBlockFrame) +{ + // Nothing to do for text-overflow:clip or if 'overflow-x/y:visible' or if + // we're just building items for event processing or frame visibility. + if (HasClippedOverflow(aBlockFrame) || + IsInlineAxisOverflowVisible(aBlockFrame) || + aBuilder->IsForEventDelivery() || + aBuilder->IsForFrameVisibility()) { + return false; + } + + // Skip ComboboxControlFrame because it would clip the drop-down arrow. + // Its anon block inherits 'text-overflow' and does what is expected. + if (aBlockFrame->GetType() == nsGkAtoms::comboboxControlFrame) { + return false; + } + + // Inhibit the markers if a descendant content owns the caret. + RefPtr<nsCaret> caret = aBlockFrame->PresContext()->PresShell()->GetCaret(); + if (caret && caret->IsVisible()) { + nsCOMPtr<nsISelection> domSelection = caret->GetSelection(); + if (domSelection) { + nsCOMPtr<nsIDOMNode> node; + domSelection->GetFocusNode(getter_AddRefs(node)); + nsCOMPtr<nsIContent> content = do_QueryInterface(node); + if (content && nsContentUtils::ContentIsDescendantOf(content, + aBlockFrame->GetContent())) { + return false; + } + } + } + return true; +} + +void +TextOverflow::CreateMarkers(const nsLineBox* aLine, + bool aCreateIStart, bool aCreateIEnd, + const mozilla::LogicalRect& aInsideMarkersArea) +{ + if (aCreateIStart) { + DisplayListClipState::AutoSaveRestore clipState(mBuilder); + + LogicalRect markerLogicalRect( + mBlockWM, aInsideMarkersArea.IStart(mBlockWM) - mIStart.mIntrinsicISize, + aLine->BStart(), mIStart.mIntrinsicISize, aLine->BSize()); + nsPoint offset = mBuilder->ToReferenceFrame(mBlock); + nsRect markerRect = + markerLogicalRect.GetPhysicalRect(mBlockWM, mBlockSize) + offset; + ClipMarker(mContentArea.GetPhysicalRect(mBlockWM, mBlockSize) + offset, + markerRect, clipState); + nsDisplayItem* marker = new (mBuilder) + nsDisplayTextOverflowMarker(mBuilder, mBlock, markerRect, + aLine->GetLogicalAscent(), mIStart.mStyle, 0); + mMarkerList.AppendNewToTop(marker); + } + + if (aCreateIEnd) { + DisplayListClipState::AutoSaveRestore clipState(mBuilder); + + LogicalRect markerLogicalRect( + mBlockWM, aInsideMarkersArea.IEnd(mBlockWM), aLine->BStart(), + mIEnd.mIntrinsicISize, aLine->BSize()); + nsPoint offset = mBuilder->ToReferenceFrame(mBlock); + nsRect markerRect = + markerLogicalRect.GetPhysicalRect(mBlockWM, mBlockSize) + offset; + ClipMarker(mContentArea.GetPhysicalRect(mBlockWM, mBlockSize) + offset, + markerRect, clipState); + nsDisplayItem* marker = new (mBuilder) + nsDisplayTextOverflowMarker(mBuilder, mBlock, markerRect, + aLine->GetLogicalAscent(), mIEnd.mStyle, 1); + mMarkerList.AppendNewToTop(marker); + } +} + +void +TextOverflow::Marker::SetupString(nsIFrame* aFrame) +{ + if (mInitialized) { + return; + } + + if (mStyle->mType == NS_STYLE_TEXT_OVERFLOW_ELLIPSIS) { + gfxTextRun* textRun = GetEllipsisTextRun(aFrame); + if (textRun) { + mISize = textRun->GetAdvanceWidth(); + } else { + mISize = 0; + } + } else { + nsRenderingContext rc( + aFrame->PresContext()->PresShell()->CreateReferenceRenderingContext()); + RefPtr<nsFontMetrics> fm = + nsLayoutUtils::GetInflatedFontMetricsForFrame(aFrame); + mISize = nsLayoutUtils::AppUnitWidthOfStringBidi(mStyle->mString, aFrame, + *fm, rc); + } + mIntrinsicISize = mISize; + mInitialized = true; +} + +} // namespace css +} // namespace mozilla |