837 lines
30 KiB
C++
837 lines
30 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "TextOverflow.h"
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#include <algorithm>
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// Please maintain alphabetical order below
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#include "nsBlockFrame.h"
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#include "nsCaret.h"
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#include "nsContentUtils.h"
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#include "nsCSSAnonBoxes.h"
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#include "nsFontMetrics.h"
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#include "nsGfxScrollFrame.h"
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#include "nsIScrollableFrame.h"
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#include "nsLayoutUtils.h"
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#include "nsPresContext.h"
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#include "nsRect.h"
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#include "nsRenderingContext.h"
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#include "nsTextFrame.h"
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#include "nsIFrameInlines.h"
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#include "mozilla/ArrayUtils.h"
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#include "mozilla/Likely.h"
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#include "nsISelection.h"
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namespace mozilla {
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namespace css {
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class LazyReferenceRenderingDrawTargetGetterFromFrame final :
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public gfxFontGroup::LazyReferenceDrawTargetGetter {
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public:
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typedef mozilla::gfx::DrawTarget DrawTarget;
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explicit LazyReferenceRenderingDrawTargetGetterFromFrame(nsIFrame* aFrame)
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: mFrame(aFrame) {}
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virtual already_AddRefed<DrawTarget> GetRefDrawTarget() override
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{
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RefPtr<gfxContext> ctx =
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mFrame->PresContext()->PresShell()->CreateReferenceRenderingContext();
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RefPtr<DrawTarget> dt = ctx->GetDrawTarget();
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return dt.forget();
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}
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private:
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nsIFrame* mFrame;
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};
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static gfxTextRun*
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GetEllipsisTextRun(nsIFrame* aFrame)
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{
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RefPtr<nsFontMetrics> fm =
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nsLayoutUtils::GetInflatedFontMetricsForFrame(aFrame);
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LazyReferenceRenderingDrawTargetGetterFromFrame lazyRefDrawTargetGetter(aFrame);
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return fm->GetThebesFontGroup()->GetEllipsisTextRun(
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aFrame->PresContext()->AppUnitsPerDevPixel(),
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nsLayoutUtils::GetTextRunOrientFlagsForStyle(aFrame->StyleContext()),
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lazyRefDrawTargetGetter);
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}
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static nsIFrame*
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GetSelfOrNearestBlock(nsIFrame* aFrame)
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{
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return nsLayoutUtils::GetAsBlock(aFrame) ? aFrame :
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nsLayoutUtils::FindNearestBlockAncestor(aFrame);
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}
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// Return true if the frame is an atomic inline-level element.
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// It's not supposed to be called for block frames since we never
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// process block descendants for text-overflow.
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static bool
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IsAtomicElement(nsIFrame* aFrame, const nsIAtom* aFrameType)
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{
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NS_PRECONDITION(!nsLayoutUtils::GetAsBlock(aFrame) ||
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!aFrame->IsBlockOutside(),
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"unexpected block frame");
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NS_PRECONDITION(aFrameType != nsGkAtoms::placeholderFrame,
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"unexpected placeholder frame");
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return !aFrame->IsFrameOfType(nsIFrame::eLineParticipant);
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}
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static bool
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IsFullyClipped(nsTextFrame* aFrame, nscoord aLeft, nscoord aRight,
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nscoord* aSnappedLeft, nscoord* aSnappedRight)
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{
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*aSnappedLeft = aLeft;
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*aSnappedRight = aRight;
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if (aLeft <= 0 && aRight <= 0) {
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return false;
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}
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return !aFrame->MeasureCharClippedText(aLeft, aRight,
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aSnappedLeft, aSnappedRight);
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}
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static bool
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IsInlineAxisOverflowVisible(nsIFrame* aFrame)
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{
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NS_PRECONDITION(nsLayoutUtils::GetAsBlock(aFrame) != nullptr,
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"expected a block frame");
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nsIFrame* f = aFrame;
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while (f && f->StyleContext()->GetPseudo() &&
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f->GetType() != nsGkAtoms::scrollFrame) {
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f = f->GetParent();
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}
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if (!f) {
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return true;
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}
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auto overflow = aFrame->GetWritingMode().IsVertical() ?
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f->StyleDisplay()->mOverflowY : f->StyleDisplay()->mOverflowX;
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return overflow == NS_STYLE_OVERFLOW_VISIBLE;
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}
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static void
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ClipMarker(const nsRect& aContentArea,
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const nsRect& aMarkerRect,
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DisplayListClipState::AutoSaveRestore& aClipState)
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{
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nscoord rightOverflow = aMarkerRect.XMost() - aContentArea.XMost();
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nsRect markerRect = aMarkerRect;
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if (rightOverflow > 0) {
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// Marker overflows on the right side (content width < marker width).
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markerRect.width -= rightOverflow;
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aClipState.ClipContentDescendants(markerRect);
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} else {
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nscoord leftOverflow = aContentArea.x - aMarkerRect.x;
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if (leftOverflow > 0) {
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// Marker overflows on the left side
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markerRect.width -= leftOverflow;
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markerRect.x += leftOverflow;
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aClipState.ClipContentDescendants(markerRect);
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}
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}
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}
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static void
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InflateIStart(WritingMode aWM, LogicalRect* aRect, nscoord aDelta)
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{
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nscoord iend = aRect->IEnd(aWM);
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aRect->IStart(aWM) -= aDelta;
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aRect->ISize(aWM) = std::max(iend - aRect->IStart(aWM), 0);
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}
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static void
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InflateIEnd(WritingMode aWM, LogicalRect* aRect, nscoord aDelta)
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{
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aRect->ISize(aWM) = std::max(aRect->ISize(aWM) + aDelta, 0);
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}
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static bool
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IsFrameDescendantOfAny(nsIFrame* aChild,
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const TextOverflow::FrameHashtable& aSetOfFrames,
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nsIFrame* aCommonAncestor)
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{
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for (nsIFrame* f = aChild; f && f != aCommonAncestor;
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f = nsLayoutUtils::GetCrossDocParentFrame(f)) {
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if (aSetOfFrames.GetEntry(f)) {
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return true;
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}
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}
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return false;
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}
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class nsDisplayTextOverflowMarker : public nsDisplayItem
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{
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public:
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nsDisplayTextOverflowMarker(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
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const nsRect& aRect, nscoord aAscent,
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const nsStyleTextOverflowSide* aStyle,
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uint32_t aIndex)
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: nsDisplayItem(aBuilder, aFrame), mRect(aRect),
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mStyle(aStyle), mAscent(aAscent), mIndex(aIndex) {
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MOZ_COUNT_CTOR(nsDisplayTextOverflowMarker);
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}
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#ifdef NS_BUILD_REFCNT_LOGGING
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virtual ~nsDisplayTextOverflowMarker() {
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MOZ_COUNT_DTOR(nsDisplayTextOverflowMarker);
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}
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#endif
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virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder,
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bool* aSnap) override {
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*aSnap = false;
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nsRect shadowRect =
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nsLayoutUtils::GetTextShadowRectsUnion(mRect, mFrame);
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return mRect.Union(shadowRect);
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}
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virtual nsRect GetComponentAlphaBounds(nsDisplayListBuilder* aBuilder) override
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{
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if (gfxPlatform::GetPlatform()->RespectsFontStyleSmoothing()) {
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// On OS X, web authors can turn off subpixel text rendering using the
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// CSS property -moz-osx-font-smoothing. If they do that, we don't need
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// to use component alpha layers for the affected text.
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if (mFrame->StyleFont()->mFont.smoothing == NS_FONT_SMOOTHING_GRAYSCALE) {
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return nsRect();
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}
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}
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bool snap;
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return GetBounds(aBuilder, &snap);
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}
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virtual void Paint(nsDisplayListBuilder* aBuilder,
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nsRenderingContext* aCtx) override;
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virtual uint32_t GetPerFrameKey() override {
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return (mIndex << nsDisplayItem::TYPE_BITS) | nsDisplayItem::GetPerFrameKey();
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}
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void PaintTextToContext(nsRenderingContext* aCtx,
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nsPoint aOffsetFromRect);
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NS_DISPLAY_DECL_NAME("TextOverflow", TYPE_TEXT_OVERFLOW)
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private:
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nsRect mRect; // in reference frame coordinates
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const nsStyleTextOverflowSide* mStyle;
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nscoord mAscent; // baseline for the marker text in mRect
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uint32_t mIndex;
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};
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static void
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PaintTextShadowCallback(nsRenderingContext* aCtx,
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nsPoint aShadowOffset,
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const nscolor& aShadowColor,
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void* aData)
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{
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reinterpret_cast<nsDisplayTextOverflowMarker*>(aData)->
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PaintTextToContext(aCtx, aShadowOffset);
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}
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void
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nsDisplayTextOverflowMarker::Paint(nsDisplayListBuilder* aBuilder,
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nsRenderingContext* aCtx)
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{
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nscolor foregroundColor = nsLayoutUtils::
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GetColor(mFrame, eCSSProperty__webkit_text_fill_color);
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// Paint the text-shadows for the overflow marker
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nsLayoutUtils::PaintTextShadow(mFrame, aCtx, mRect, mVisibleRect,
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foregroundColor, PaintTextShadowCallback,
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(void*)this);
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aCtx->ThebesContext()->SetColor(gfx::Color::FromABGR(foregroundColor));
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PaintTextToContext(aCtx, nsPoint(0, 0));
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}
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void
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nsDisplayTextOverflowMarker::PaintTextToContext(nsRenderingContext* aCtx,
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nsPoint aOffsetFromRect)
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{
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WritingMode wm = mFrame->GetWritingMode();
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nsPoint pt(mRect.x, mRect.y);
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if (wm.IsVertical()) {
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if (wm.IsVerticalLR()) {
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pt.x = NSToCoordFloor(nsLayoutUtils::GetSnappedBaselineX(
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mFrame, aCtx->ThebesContext(), pt.x, mAscent));
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} else {
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pt.x = NSToCoordFloor(nsLayoutUtils::GetSnappedBaselineX(
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mFrame, aCtx->ThebesContext(), pt.x + mRect.width, -mAscent));
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}
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} else {
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pt.y = NSToCoordFloor(nsLayoutUtils::GetSnappedBaselineY(
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mFrame, aCtx->ThebesContext(), pt.y, mAscent));
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}
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pt += aOffsetFromRect;
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if (mStyle->mType == NS_STYLE_TEXT_OVERFLOW_ELLIPSIS) {
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gfxTextRun* textRun = GetEllipsisTextRun(mFrame);
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if (textRun) {
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NS_ASSERTION(!textRun->IsRightToLeft(),
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"Ellipsis textruns should always be LTR!");
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gfxPoint gfxPt(pt.x, pt.y);
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textRun->Draw(gfxTextRun::Range(textRun), gfxPt,
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gfxTextRun::DrawParams(aCtx->ThebesContext()));
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}
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} else {
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RefPtr<nsFontMetrics> fm =
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nsLayoutUtils::GetInflatedFontMetricsForFrame(mFrame);
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nsLayoutUtils::DrawString(mFrame, *fm, aCtx, mStyle->mString.get(),
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mStyle->mString.Length(), pt);
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}
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}
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TextOverflow::TextOverflow(nsDisplayListBuilder* aBuilder,
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nsIFrame* aBlockFrame)
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: mContentArea(aBlockFrame->GetWritingMode(),
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aBlockFrame->GetContentRectRelativeToSelf(),
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aBlockFrame->GetSize())
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, mBuilder(aBuilder)
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, mBlock(aBlockFrame)
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, mScrollableFrame(nsLayoutUtils::GetScrollableFrameFor(aBlockFrame))
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, mBlockSize(aBlockFrame->GetSize())
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, mBlockWM(aBlockFrame->GetWritingMode())
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, mAdjustForPixelSnapping(false)
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{
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#ifdef MOZ_XUL
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if (!mScrollableFrame) {
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nsIAtom* pseudoType = aBlockFrame->StyleContext()->GetPseudo();
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if (pseudoType == nsCSSAnonBoxes::mozXULAnonymousBlock) {
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mScrollableFrame =
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nsLayoutUtils::GetScrollableFrameFor(aBlockFrame->GetParent());
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// nsXULScrollFrame::ClampAndSetBounds rounds to nearest pixels
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// for RTL blocks (also for overflow:hidden), so we need to move
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// the edges 1px outward in ExamineLineFrames to avoid triggering
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// a text-overflow marker in this case.
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mAdjustForPixelSnapping = !mBlockWM.IsBidiLTR();
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}
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}
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#endif
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mCanHaveInlineAxisScrollbar = false;
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if (mScrollableFrame) {
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auto scrollbarStyle = mBlockWM.IsVertical() ?
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mScrollableFrame->GetScrollStyles().mVertical :
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mScrollableFrame->GetScrollStyles().mHorizontal;
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mCanHaveInlineAxisScrollbar = scrollbarStyle != NS_STYLE_OVERFLOW_HIDDEN;
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if (!mAdjustForPixelSnapping) {
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// Scrolling to the end position can leave some text still overflowing due
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// to pixel snapping behaviour in our scrolling code.
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mAdjustForPixelSnapping = mCanHaveInlineAxisScrollbar;
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}
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// Use a null containerSize to convert a vector from logical to physical.
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const nsSize nullContainerSize;
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mContentArea.MoveBy(mBlockWM,
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LogicalPoint(mBlockWM,
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mScrollableFrame->GetScrollPosition(),
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nullContainerSize));
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nsIFrame* scrollFrame = do_QueryFrame(mScrollableFrame);
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scrollFrame->AddStateBits(NS_SCROLLFRAME_INVALIDATE_CONTENTS_ON_SCROLL);
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}
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uint8_t direction = aBlockFrame->StyleVisibility()->mDirection;
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const nsStyleTextReset* style = aBlockFrame->StyleTextReset();
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if (mBlockWM.IsBidiLTR()) {
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mIStart.Init(style->mTextOverflow.GetLeft(direction));
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mIEnd.Init(style->mTextOverflow.GetRight(direction));
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} else {
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mIStart.Init(style->mTextOverflow.GetRight(direction));
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mIEnd.Init(style->mTextOverflow.GetLeft(direction));
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}
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// The left/right marker string is setup in ExamineLineFrames when a line
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// has overflow on that side.
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}
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/* static */ TextOverflow*
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TextOverflow::WillProcessLines(nsDisplayListBuilder* aBuilder,
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nsIFrame* aBlockFrame)
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{
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if (!CanHaveTextOverflow(aBuilder, aBlockFrame)) {
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return nullptr;
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}
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nsIScrollableFrame* scrollableFrame = nsLayoutUtils::GetScrollableFrameFor(aBlockFrame);
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if (scrollableFrame && scrollableFrame->IsTransformingByAPZ()) {
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// If the APZ is actively scrolling this, don't bother with markers.
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return nullptr;
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}
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return new TextOverflow(aBuilder, aBlockFrame);
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}
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void
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TextOverflow::ExamineFrameSubtree(nsIFrame* aFrame,
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const LogicalRect& aContentArea,
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const LogicalRect& aInsideMarkersArea,
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FrameHashtable* aFramesToHide,
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AlignmentEdges* aAlignmentEdges,
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bool* aFoundVisibleTextOrAtomic,
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InnerClipEdges* aClippedMarkerEdges)
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{
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const nsIAtom* frameType = aFrame->GetType();
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if (frameType == nsGkAtoms::brFrame ||
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frameType == nsGkAtoms::placeholderFrame) {
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return;
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}
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const bool isAtomic = IsAtomicElement(aFrame, frameType);
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if (aFrame->StyleVisibility()->IsVisible()) {
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LogicalRect childRect =
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GetLogicalScrollableOverflowRectRelativeToBlock(aFrame);
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bool overflowIStart =
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childRect.IStart(mBlockWM) < aContentArea.IStart(mBlockWM);
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bool overflowIEnd =
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childRect.IEnd(mBlockWM) > aContentArea.IEnd(mBlockWM);
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if (overflowIStart) {
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mIStart.mHasOverflow = true;
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}
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if (overflowIEnd) {
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mIEnd.mHasOverflow = true;
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}
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if (isAtomic && ((mIStart.mActive && overflowIStart) ||
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(mIEnd.mActive && overflowIEnd))) {
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aFramesToHide->PutEntry(aFrame);
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} else if (isAtomic || frameType == nsGkAtoms::textFrame) {
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AnalyzeMarkerEdges(aFrame, frameType, aInsideMarkersArea,
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aFramesToHide, aAlignmentEdges,
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aFoundVisibleTextOrAtomic,
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aClippedMarkerEdges);
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}
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}
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if (isAtomic) {
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return;
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}
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for (nsIFrame* child : aFrame->PrincipalChildList()) {
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ExamineFrameSubtree(child, aContentArea, aInsideMarkersArea,
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aFramesToHide, aAlignmentEdges,
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aFoundVisibleTextOrAtomic,
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aClippedMarkerEdges);
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}
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}
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void
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TextOverflow::AnalyzeMarkerEdges(nsIFrame* aFrame,
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const nsIAtom* aFrameType,
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const LogicalRect& aInsideMarkersArea,
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FrameHashtable* aFramesToHide,
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AlignmentEdges* aAlignmentEdges,
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bool* aFoundVisibleTextOrAtomic,
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InnerClipEdges* aClippedMarkerEdges)
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{
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LogicalRect borderRect(mBlockWM,
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nsRect(aFrame->GetOffsetTo(mBlock),
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aFrame->GetSize()),
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mBlockSize);
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nscoord istartOverlap = std::max(
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aInsideMarkersArea.IStart(mBlockWM) - borderRect.IStart(mBlockWM), 0);
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nscoord iendOverlap = std::max(
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borderRect.IEnd(mBlockWM) - aInsideMarkersArea.IEnd(mBlockWM), 0);
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bool insideIStartEdge =
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aInsideMarkersArea.IStart(mBlockWM) <= borderRect.IEnd(mBlockWM);
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bool insideIEndEdge =
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borderRect.IStart(mBlockWM) <= aInsideMarkersArea.IEnd(mBlockWM);
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if (istartOverlap > 0) {
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aClippedMarkerEdges->AccumulateIStart(mBlockWM, borderRect);
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if (!mIStart.mActive) {
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istartOverlap = 0;
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}
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}
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if (iendOverlap > 0) {
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aClippedMarkerEdges->AccumulateIEnd(mBlockWM, borderRect);
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if (!mIEnd.mActive) {
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iendOverlap = 0;
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}
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}
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if ((istartOverlap > 0 && insideIStartEdge) ||
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(iendOverlap > 0 && insideIEndEdge)) {
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if (aFrameType == nsGkAtoms::textFrame) {
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if (aInsideMarkersArea.IStart(mBlockWM) <
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aInsideMarkersArea.IEnd(mBlockWM)) {
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// a clipped text frame and there is some room between the markers
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nscoord snappedIStart, snappedIEnd;
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auto textFrame = static_cast<nsTextFrame*>(aFrame);
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bool isFullyClipped = mBlockWM.IsBidiLTR() ?
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IsFullyClipped(textFrame, istartOverlap, iendOverlap,
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&snappedIStart, &snappedIEnd) :
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IsFullyClipped(textFrame, iendOverlap, istartOverlap,
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&snappedIEnd, &snappedIStart);
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if (!isFullyClipped) {
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LogicalRect snappedRect = borderRect;
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if (istartOverlap > 0) {
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snappedRect.IStart(mBlockWM) += snappedIStart;
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snappedRect.ISize(mBlockWM) -= snappedIStart;
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}
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if (iendOverlap > 0) {
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snappedRect.ISize(mBlockWM) -= snappedIEnd;
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}
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aAlignmentEdges->Accumulate(mBlockWM, snappedRect);
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*aFoundVisibleTextOrAtomic = true;
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}
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}
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} else {
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aFramesToHide->PutEntry(aFrame);
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}
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} else if (!insideIStartEdge || !insideIEndEdge) {
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// frame is outside
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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
|