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0dfbf8aa38
Yo dawg, I heard you like ternaries. R=abarth@chromium.org Review URL: https://codereview.chromium.org/688233002
1642 lines
74 KiB
C++
1642 lines
74 KiB
C++
/*
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* Copyright (C) 2000 Lars Knoll (knoll@kde.org)
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* Copyright (C) 2003, 2004, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All right reserved.
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* Copyright (C) 2010 Google Inc. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*
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*/
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#include "config.h"
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#include "core/rendering/BidiRunForLine.h"
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#include "core/rendering/RenderLayer.h"
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#include "core/rendering/RenderObjectInlines.h"
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#include "core/rendering/RenderView.h"
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#include "core/rendering/TextRunConstructor.h"
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#include "core/rendering/TrailingFloatsRootInlineBox.h"
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#include "core/rendering/VerticalPositionCache.h"
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#include "core/rendering/line/BreakingContextInlineHeaders.h"
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#include "core/rendering/line/LineLayoutState.h"
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#include "core/rendering/line/LineWidth.h"
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#include "core/rendering/line/RenderTextInfo.h"
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#include "core/rendering/line/WordMeasurement.h"
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#include "platform/fonts/Character.h"
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#include "platform/text/BidiResolver.h"
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#include "wtf/RefCountedLeakCounter.h"
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#include "wtf/StdLibExtras.h"
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#include "wtf/Vector.h"
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#include "wtf/unicode/CharacterNames.h"
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namespace blink {
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using namespace WTF::Unicode;
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static inline InlineBox* createInlineBoxForRenderer(RenderObject* obj, bool isRootLineBox, bool isOnlyRun = false)
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{
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if (isRootLineBox)
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return toRenderBlockFlow(obj)->createAndAppendRootInlineBox();
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if (obj->isText()) {
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InlineTextBox* textBox = toRenderText(obj)->createInlineTextBox();
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// We only treat a box as text for a <br> if we are on a line by ourself or in strict mode
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// (Note the use of strict mode. In "almost strict" mode, we don't treat the box for <br> as text.)
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return textBox;
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}
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if (obj->isBox())
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return toRenderBox(obj)->createInlineBox();
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return toRenderInline(obj)->createAndAppendInlineFlowBox();
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}
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static inline void dirtyLineBoxesForRenderer(RenderObject* o, bool fullLayout)
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{
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if (o->isText()) {
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RenderText* renderText = toRenderText(o);
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renderText->dirtyLineBoxes(fullLayout);
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} else
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toRenderInline(o)->dirtyLineBoxes(fullLayout);
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}
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static bool parentIsConstructedOrHaveNext(InlineFlowBox* parentBox)
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{
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do {
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if (parentBox->isConstructed() || parentBox->nextOnLine())
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return true;
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parentBox = parentBox->parent();
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} while (parentBox);
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return false;
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}
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InlineFlowBox* RenderBlockFlow::createLineBoxes(RenderObject* obj, const LineInfo& lineInfo, InlineBox* childBox)
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{
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// See if we have an unconstructed line box for this object that is also
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// the last item on the line.
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unsigned lineDepth = 1;
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InlineFlowBox* parentBox = 0;
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InlineFlowBox* result = 0;
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bool hasDefaultLineBoxContain = style()->lineBoxContain() == RenderStyle::initialLineBoxContain();
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do {
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ASSERT_WITH_SECURITY_IMPLICATION(obj->isRenderInline() || obj == this);
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RenderInline* inlineFlow = (obj != this) ? toRenderInline(obj) : 0;
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// Get the last box we made for this render object.
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parentBox = inlineFlow ? inlineFlow->lastLineBox() : toRenderBlock(obj)->lastLineBox();
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// If this box or its ancestor is constructed then it is from a previous line, and we need
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// to make a new box for our line. If this box or its ancestor is unconstructed but it has
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// something following it on the line, then we know we have to make a new box
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// as well. In this situation our inline has actually been split in two on
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// the same line (this can happen with very fancy language mixtures).
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bool constructedNewBox = false;
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bool allowedToConstructNewBox = !hasDefaultLineBoxContain || !inlineFlow || inlineFlow->alwaysCreateLineBoxes();
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bool canUseExistingParentBox = parentBox && !parentIsConstructedOrHaveNext(parentBox);
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if (allowedToConstructNewBox && !canUseExistingParentBox) {
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// We need to make a new box for this render object. Once
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// made, we need to place it at the end of the current line.
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InlineBox* newBox = createInlineBoxForRenderer(obj, obj == this);
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ASSERT_WITH_SECURITY_IMPLICATION(newBox->isInlineFlowBox());
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parentBox = toInlineFlowBox(newBox);
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parentBox->setFirstLineStyleBit(lineInfo.isFirstLine());
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if (!hasDefaultLineBoxContain)
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parentBox->clearDescendantsHaveSameLineHeightAndBaseline();
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constructedNewBox = true;
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}
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if (constructedNewBox || canUseExistingParentBox) {
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if (!result)
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result = parentBox;
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// If we have hit the block itself, then |box| represents the root
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// inline box for the line, and it doesn't have to be appended to any parent
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// inline.
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if (childBox)
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parentBox->addToLine(childBox);
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if (!constructedNewBox || obj == this)
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break;
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childBox = parentBox;
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}
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// If we've exceeded our line depth, then jump straight to the root and skip all the remaining
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// intermediate inline flows.
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obj = (++lineDepth >= cMaxLineDepth) ? this : obj->parent();
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} while (true);
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return result;
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}
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template <typename CharacterType>
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static inline bool endsWithASCIISpaces(const CharacterType* characters, unsigned pos, unsigned end)
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{
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while (isASCIISpace(characters[pos])) {
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pos++;
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if (pos >= end)
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return true;
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}
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return false;
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}
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static bool reachedEndOfTextRenderer(const BidiRunList<BidiRun>& bidiRuns)
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{
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BidiRun* run = bidiRuns.logicallyLastRun();
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if (!run)
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return true;
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unsigned pos = run->stop();
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RenderObject* r = run->m_object;
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if (!r->isText())
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return false;
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RenderText* renderText = toRenderText(r);
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unsigned length = renderText->textLength();
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if (pos >= length)
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return true;
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if (renderText->is8Bit())
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return endsWithASCIISpaces(renderText->characters8(), pos, length);
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return endsWithASCIISpaces(renderText->characters16(), pos, length);
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}
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RootInlineBox* RenderBlockFlow::constructLine(BidiRunList<BidiRun>& bidiRuns, const LineInfo& lineInfo)
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{
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ASSERT(bidiRuns.firstRun());
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bool rootHasSelectedChildren = false;
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InlineFlowBox* parentBox = 0;
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int runCount = bidiRuns.runCount() - lineInfo.runsFromLeadingWhitespace();
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for (BidiRun* r = bidiRuns.firstRun(); r; r = r->next()) {
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// Create a box for our object.
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bool isOnlyRun = (runCount == 1);
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if (runCount == 2)
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isOnlyRun = false;
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if (lineInfo.isEmpty())
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continue;
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InlineBox* box = createInlineBoxForRenderer(r->m_object, false, isOnlyRun);
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r->m_box = box;
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ASSERT(box);
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if (!box)
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continue;
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if (!rootHasSelectedChildren && box->renderer().selectionState() != RenderObject::SelectionNone)
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rootHasSelectedChildren = true;
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// If we have no parent box yet, or if the run is not simply a sibling,
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// then we need to construct inline boxes as necessary to properly enclose the
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// run's inline box. Segments can only be siblings at the root level, as
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// they are positioned separately.
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if (!parentBox || parentBox->renderer() != r->m_object->parent()) {
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// Create new inline boxes all the way back to the appropriate insertion point.
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parentBox = createLineBoxes(r->m_object->parent(), lineInfo, box);
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} else {
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// Append the inline box to this line.
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parentBox->addToLine(box);
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}
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box->setBidiLevel(r->level());
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if (box->isInlineTextBox()) {
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InlineTextBox* text = toInlineTextBox(box);
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text->setStart(r->m_start);
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text->setLen(r->m_stop - r->m_start);
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text->setDirOverride(r->dirOverride());
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if (r->m_hasHyphen)
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text->setHasHyphen(true);
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}
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}
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// We should have a root inline box. It should be unconstructed and
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// be the last continuation of our line list.
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ASSERT(lastLineBox() && !lastLineBox()->isConstructed());
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// Set the m_selectedChildren flag on the root inline box if one of the leaf inline box
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// from the bidi runs walk above has a selection state.
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if (rootHasSelectedChildren)
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lastLineBox()->root().setHasSelectedChildren(true);
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// Set bits on our inline flow boxes that indicate which sides should
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// paint borders/margins/padding. This knowledge will ultimately be used when
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// we determine the horizontal positions and widths of all the inline boxes on
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// the line.
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bool isLogicallyLastRunWrapped = bidiRuns.logicallyLastRun()->m_object && bidiRuns.logicallyLastRun()->m_object->isText() ? !reachedEndOfTextRenderer(bidiRuns) : true;
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lastLineBox()->determineSpacingForFlowBoxes(lineInfo.isLastLine(), isLogicallyLastRunWrapped, bidiRuns.logicallyLastRun()->m_object);
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// Now mark the line boxes as being constructed.
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lastLineBox()->setConstructed();
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// Return the last line.
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return lastRootBox();
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}
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ETextAlign RenderBlockFlow::textAlignmentForLine(bool endsWithSoftBreak) const
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{
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ETextAlign alignment = style()->textAlign();
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if (endsWithSoftBreak)
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return alignment;
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if (!RuntimeEnabledFeatures::css3TextEnabled())
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return (alignment == JUSTIFY) ? TASTART : alignment;
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if (alignment != JUSTIFY)
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return alignment;
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TextAlignLast alignmentLast = style()->textAlignLast();
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switch (alignmentLast) {
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case TextAlignLastStart:
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return TASTART;
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case TextAlignLastEnd:
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return TAEND;
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case TextAlignLastLeft:
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return LEFT;
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case TextAlignLastRight:
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return RIGHT;
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case TextAlignLastCenter:
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return CENTER;
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case TextAlignLastJustify:
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return JUSTIFY;
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case TextAlignLastAuto:
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if (style()->textJustify() == TextJustifyDistribute)
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return JUSTIFY;
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return TASTART;
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}
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return alignment;
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}
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static void updateLogicalWidthForLeftAlignedBlock(bool isLeftToRightDirection, BidiRun* trailingSpaceRun, float& logicalLeft, float& totalLogicalWidth, float availableLogicalWidth)
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{
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// The direction of the block should determine what happens with wide lines.
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// In particular with RTL blocks, wide lines should still spill out to the left.
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if (isLeftToRightDirection) {
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if (totalLogicalWidth > availableLogicalWidth && trailingSpaceRun)
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trailingSpaceRun->m_box->setLogicalWidth(std::max<float>(0, trailingSpaceRun->m_box->logicalWidth() - totalLogicalWidth + availableLogicalWidth));
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return;
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}
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if (trailingSpaceRun)
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trailingSpaceRun->m_box->setLogicalWidth(0);
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else if (totalLogicalWidth > availableLogicalWidth)
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logicalLeft -= (totalLogicalWidth - availableLogicalWidth);
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}
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static void updateLogicalWidthForRightAlignedBlock(bool isLeftToRightDirection, BidiRun* trailingSpaceRun, float& logicalLeft, float& totalLogicalWidth, float availableLogicalWidth)
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{
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// Wide lines spill out of the block based off direction.
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// So even if text-align is right, if direction is LTR, wide lines should overflow out of the right
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// side of the block.
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if (isLeftToRightDirection) {
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if (trailingSpaceRun) {
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totalLogicalWidth -= trailingSpaceRun->m_box->logicalWidth();
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trailingSpaceRun->m_box->setLogicalWidth(0);
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}
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if (totalLogicalWidth < availableLogicalWidth)
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logicalLeft += availableLogicalWidth - totalLogicalWidth;
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return;
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}
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if (totalLogicalWidth > availableLogicalWidth && trailingSpaceRun) {
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trailingSpaceRun->m_box->setLogicalWidth(std::max<float>(0, trailingSpaceRun->m_box->logicalWidth() - totalLogicalWidth + availableLogicalWidth));
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totalLogicalWidth -= trailingSpaceRun->m_box->logicalWidth();
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} else
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logicalLeft += availableLogicalWidth - totalLogicalWidth;
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}
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static void updateLogicalWidthForCenterAlignedBlock(bool isLeftToRightDirection, BidiRun* trailingSpaceRun, float& logicalLeft, float& totalLogicalWidth, float availableLogicalWidth)
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{
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float trailingSpaceWidth = 0;
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if (trailingSpaceRun) {
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totalLogicalWidth -= trailingSpaceRun->m_box->logicalWidth();
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trailingSpaceWidth = std::min(trailingSpaceRun->m_box->logicalWidth(), (availableLogicalWidth - totalLogicalWidth + 1) / 2);
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trailingSpaceRun->m_box->setLogicalWidth(std::max<float>(0, trailingSpaceWidth));
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}
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if (isLeftToRightDirection)
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logicalLeft += std::max<float>((availableLogicalWidth - totalLogicalWidth) / 2, 0);
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else
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logicalLeft += totalLogicalWidth > availableLogicalWidth ? (availableLogicalWidth - totalLogicalWidth) : (availableLogicalWidth - totalLogicalWidth) / 2 - trailingSpaceWidth;
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}
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static inline void setLogicalWidthForTextRun(RootInlineBox* lineBox, BidiRun* run, RenderText* renderer, float xPos, const LineInfo& lineInfo,
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GlyphOverflowAndFallbackFontsMap& textBoxDataMap, VerticalPositionCache& verticalPositionCache, WordMeasurements& wordMeasurements)
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{
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HashSet<const SimpleFontData*> fallbackFonts;
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GlyphOverflow glyphOverflow;
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const Font& font = renderer->style(lineInfo.isFirstLine())->font();
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// Always compute glyph overflow if the block's line-box-contain value is "glyphs".
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if (lineBox->fitsToGlyphs()) {
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// If we don't stick out of the root line's font box, then don't bother computing our glyph overflow. This optimization
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// will keep us from computing glyph bounds in nearly all cases.
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bool includeRootLine = lineBox->includesRootLineBoxFontOrLeading();
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int baselineShift = lineBox->verticalPositionForBox(run->m_box, verticalPositionCache);
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int rootDescent = includeRootLine ? font.fontMetrics().descent() : 0;
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int rootAscent = includeRootLine ? font.fontMetrics().ascent() : 0;
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int boxAscent = font.fontMetrics().ascent() - baselineShift;
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int boxDescent = font.fontMetrics().descent() + baselineShift;
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if (boxAscent > rootDescent || boxDescent > rootAscent)
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glyphOverflow.computeBounds = true;
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}
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LayoutUnit hyphenWidth = 0;
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if (toInlineTextBox(run->m_box)->hasHyphen()) {
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const Font& font = renderer->style(lineInfo.isFirstLine())->font();
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hyphenWidth = measureHyphenWidth(renderer, font, run->direction());
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}
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float measuredWidth = 0;
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bool kerningIsEnabled = font.fontDescription().typesettingFeatures() & Kerning;
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#if OS(MACOSX)
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// FIXME: Having any font feature settings enabled can lead to selection gaps on
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// Chromium-mac. https://bugs.webkit.org/show_bug.cgi?id=113418
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bool canUseSimpleFontCodePath = renderer->canUseSimpleFontCodePath() && !font.fontDescription().featureSettings();
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#else
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bool canUseSimpleFontCodePath = renderer->canUseSimpleFontCodePath();
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#endif
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// Since we don't cache glyph overflows, we need to re-measure the run if
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// the style is linebox-contain: glyph.
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if (!lineBox->fitsToGlyphs() && canUseSimpleFontCodePath) {
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int lastEndOffset = run->m_start;
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for (size_t i = 0, size = wordMeasurements.size(); i < size && lastEndOffset < run->m_stop; ++i) {
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const WordMeasurement& wordMeasurement = wordMeasurements[i];
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if (wordMeasurement.width <=0 || wordMeasurement.startOffset == wordMeasurement.endOffset)
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continue;
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if (wordMeasurement.renderer != renderer || wordMeasurement.startOffset != lastEndOffset || wordMeasurement.endOffset > run->m_stop)
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continue;
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lastEndOffset = wordMeasurement.endOffset;
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if (kerningIsEnabled && lastEndOffset == run->m_stop) {
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int wordLength = lastEndOffset - wordMeasurement.startOffset;
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measuredWidth += renderer->width(wordMeasurement.startOffset, wordLength, xPos, run->direction(), lineInfo.isFirstLine());
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if (i > 0 && wordLength == 1 && renderer->characterAt(wordMeasurement.startOffset) == ' ')
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measuredWidth += renderer->style()->wordSpacing();
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} else
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measuredWidth += wordMeasurement.width;
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if (!wordMeasurement.fallbackFonts.isEmpty()) {
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HashSet<const SimpleFontData*>::const_iterator end = wordMeasurement.fallbackFonts.end();
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for (HashSet<const SimpleFontData*>::const_iterator it = wordMeasurement.fallbackFonts.begin(); it != end; ++it)
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fallbackFonts.add(*it);
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}
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}
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if (measuredWidth && lastEndOffset != run->m_stop) {
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// If we don't have enough cached data, we'll measure the run again.
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measuredWidth = 0;
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fallbackFonts.clear();
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}
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}
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if (!measuredWidth)
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measuredWidth = renderer->width(run->m_start, run->m_stop - run->m_start, xPos, run->direction(), lineInfo.isFirstLine(), &fallbackFonts, &glyphOverflow);
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run->m_box->setLogicalWidth(measuredWidth + hyphenWidth);
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if (!fallbackFonts.isEmpty()) {
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ASSERT(run->m_box->isText());
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GlyphOverflowAndFallbackFontsMap::ValueType* it = textBoxDataMap.add(toInlineTextBox(run->m_box), std::make_pair(Vector<const SimpleFontData*>(), GlyphOverflow())).storedValue;
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ASSERT(it->value.first.isEmpty());
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copyToVector(fallbackFonts, it->value.first);
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run->m_box->parent()->clearDescendantsHaveSameLineHeightAndBaseline();
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}
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if (!glyphOverflow.isZero()) {
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ASSERT(run->m_box->isText());
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GlyphOverflowAndFallbackFontsMap::ValueType* it = textBoxDataMap.add(toInlineTextBox(run->m_box), std::make_pair(Vector<const SimpleFontData*>(), GlyphOverflow())).storedValue;
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it->value.second = glyphOverflow;
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run->m_box->clearKnownToHaveNoOverflow();
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}
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}
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static inline void computeExpansionForJustifiedText(BidiRun* firstRun, BidiRun* trailingSpaceRun, Vector<unsigned, 16>& expansionOpportunities, unsigned expansionOpportunityCount, float& totalLogicalWidth, float availableLogicalWidth)
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{
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if (!expansionOpportunityCount || availableLogicalWidth <= totalLogicalWidth)
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return;
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size_t i = 0;
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for (BidiRun* r = firstRun; r; r = r->next()) {
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if (!r->m_box || r == trailingSpaceRun)
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continue;
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if (r->m_object->isText()) {
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unsigned opportunitiesInRun = expansionOpportunities[i++];
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ASSERT(opportunitiesInRun <= expansionOpportunityCount);
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|
// Don't justify for white-space: pre.
|
|
if (r->m_object->style()->whiteSpace() != PRE) {
|
|
InlineTextBox* textBox = toInlineTextBox(r->m_box);
|
|
int expansion = (availableLogicalWidth - totalLogicalWidth) * opportunitiesInRun / expansionOpportunityCount;
|
|
textBox->setExpansion(expansion);
|
|
totalLogicalWidth += expansion;
|
|
}
|
|
expansionOpportunityCount -= opportunitiesInRun;
|
|
if (!expansionOpportunityCount)
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
void RenderBlockFlow::updateLogicalWidthForAlignment(const ETextAlign& textAlign, const RootInlineBox* rootInlineBox, BidiRun* trailingSpaceRun, float& logicalLeft, float& totalLogicalWidth, float& availableLogicalWidth, unsigned expansionOpportunityCount)
|
|
{
|
|
TextDirection direction;
|
|
if (rootInlineBox && rootInlineBox->renderer().style()->unicodeBidi() == Plaintext)
|
|
direction = rootInlineBox->direction();
|
|
else
|
|
direction = style()->direction();
|
|
|
|
// Armed with the total width of the line (without justification),
|
|
// we now examine our text-align property in order to determine where to position the
|
|
// objects horizontally. The total width of the line can be increased if we end up
|
|
// justifying text.
|
|
switch (textAlign) {
|
|
case LEFT:
|
|
case WEBKIT_LEFT:
|
|
updateLogicalWidthForLeftAlignedBlock(style()->isLeftToRightDirection(), trailingSpaceRun, logicalLeft, totalLogicalWidth, availableLogicalWidth);
|
|
break;
|
|
case RIGHT:
|
|
case WEBKIT_RIGHT:
|
|
updateLogicalWidthForRightAlignedBlock(style()->isLeftToRightDirection(), trailingSpaceRun, logicalLeft, totalLogicalWidth, availableLogicalWidth);
|
|
break;
|
|
case CENTER:
|
|
case WEBKIT_CENTER:
|
|
updateLogicalWidthForCenterAlignedBlock(style()->isLeftToRightDirection(), trailingSpaceRun, logicalLeft, totalLogicalWidth, availableLogicalWidth);
|
|
break;
|
|
case JUSTIFY:
|
|
adjustInlineDirectionLineBounds(expansionOpportunityCount, logicalLeft, availableLogicalWidth);
|
|
if (expansionOpportunityCount) {
|
|
if (trailingSpaceRun) {
|
|
totalLogicalWidth -= trailingSpaceRun->m_box->logicalWidth();
|
|
trailingSpaceRun->m_box->setLogicalWidth(0);
|
|
}
|
|
break;
|
|
}
|
|
// Fall through
|
|
case TASTART:
|
|
if (direction == LTR)
|
|
updateLogicalWidthForLeftAlignedBlock(style()->isLeftToRightDirection(), trailingSpaceRun, logicalLeft, totalLogicalWidth, availableLogicalWidth);
|
|
else
|
|
updateLogicalWidthForRightAlignedBlock(style()->isLeftToRightDirection(), trailingSpaceRun, logicalLeft, totalLogicalWidth, availableLogicalWidth);
|
|
break;
|
|
case TAEND:
|
|
if (direction == LTR)
|
|
updateLogicalWidthForRightAlignedBlock(style()->isLeftToRightDirection(), trailingSpaceRun, logicalLeft, totalLogicalWidth, availableLogicalWidth);
|
|
else
|
|
updateLogicalWidthForLeftAlignedBlock(style()->isLeftToRightDirection(), trailingSpaceRun, logicalLeft, totalLogicalWidth, availableLogicalWidth);
|
|
break;
|
|
}
|
|
if (style()->shouldPlaceBlockDirectionScrollbarOnLogicalLeft())
|
|
logicalLeft += verticalScrollbarWidth();
|
|
}
|
|
|
|
static void updateLogicalInlinePositions(RenderBlockFlow* block, float& lineLogicalLeft, float& lineLogicalRight, float& availableLogicalWidth, bool firstLine, IndentTextOrNot shouldIndentText, LayoutUnit boxLogicalHeight)
|
|
{
|
|
LayoutUnit lineLogicalHeight = block->minLineHeightForReplacedRenderer(firstLine, boxLogicalHeight);
|
|
lineLogicalLeft = block->logicalLeftOffsetForLine(block->logicalHeight(), shouldIndentText == IndentText, lineLogicalHeight).toFloat();
|
|
lineLogicalRight = block->logicalRightOffsetForLine(block->logicalHeight(), shouldIndentText == IndentText, lineLogicalHeight).toFloat();
|
|
availableLogicalWidth = lineLogicalRight - lineLogicalLeft;
|
|
}
|
|
|
|
void RenderBlockFlow::computeInlineDirectionPositionsForLine(RootInlineBox* lineBox, const LineInfo& lineInfo, BidiRun* firstRun, BidiRun* trailingSpaceRun, bool reachedEnd,
|
|
GlyphOverflowAndFallbackFontsMap& textBoxDataMap, VerticalPositionCache& verticalPositionCache, WordMeasurements& wordMeasurements)
|
|
{
|
|
ETextAlign textAlign = textAlignmentForLine(!reachedEnd && !lineBox->endsWithBreak());
|
|
|
|
// CSS 2.1: "'Text-indent' only affects a line if it is the first formatted line of an element. For example, the first line of an anonymous block
|
|
// box is only affected if it is the first child of its parent element."
|
|
// CSS3 "text-indent", "each-line" affects the first line of the block container as well as each line after a forced line break,
|
|
// but does not affect lines after a soft wrap break.
|
|
bool isFirstLine = lineInfo.isFirstLine() && !(isAnonymousBlock() && parent()->slowFirstChild() != this);
|
|
bool isAfterHardLineBreak = lineBox->prevRootBox() && lineBox->prevRootBox()->endsWithBreak();
|
|
IndentTextOrNot shouldIndentText = requiresIndent(isFirstLine, isAfterHardLineBreak, style());
|
|
float lineLogicalLeft;
|
|
float lineLogicalRight;
|
|
float availableLogicalWidth;
|
|
updateLogicalInlinePositions(this, lineLogicalLeft, lineLogicalRight, availableLogicalWidth, isFirstLine, shouldIndentText, 0);
|
|
bool needsWordSpacing;
|
|
|
|
if (firstRun && firstRun->m_object->isReplaced()) {
|
|
RenderBox* renderBox = toRenderBox(firstRun->m_object);
|
|
updateLogicalInlinePositions(this, lineLogicalLeft, lineLogicalRight, availableLogicalWidth, isFirstLine, shouldIndentText, renderBox->logicalHeight());
|
|
}
|
|
|
|
computeInlineDirectionPositionsForSegment(lineBox, lineInfo, textAlign, lineLogicalLeft, availableLogicalWidth, firstRun, trailingSpaceRun, textBoxDataMap, verticalPositionCache, wordMeasurements);
|
|
// The widths of all runs are now known. We can now place every inline box (and
|
|
// compute accurate widths for the inline flow boxes).
|
|
needsWordSpacing = false;
|
|
lineBox->placeBoxesInInlineDirection(lineLogicalLeft, needsWordSpacing);
|
|
}
|
|
|
|
BidiRun* RenderBlockFlow::computeInlineDirectionPositionsForSegment(RootInlineBox* lineBox, const LineInfo& lineInfo, ETextAlign textAlign, float& logicalLeft,
|
|
float& availableLogicalWidth, BidiRun* firstRun, BidiRun* trailingSpaceRun, GlyphOverflowAndFallbackFontsMap& textBoxDataMap, VerticalPositionCache& verticalPositionCache,
|
|
WordMeasurements& wordMeasurements)
|
|
{
|
|
bool needsWordSpacing = true;
|
|
float totalLogicalWidth = lineBox->getFlowSpacingLogicalWidth().toFloat();
|
|
unsigned expansionOpportunityCount = 0;
|
|
bool isAfterExpansion = true;
|
|
Vector<unsigned, 16> expansionOpportunities;
|
|
RenderObject* previousObject = 0;
|
|
TextJustify textJustify = style()->textJustify();
|
|
|
|
BidiRun* r = firstRun;
|
|
for (; r; r = r->next()) {
|
|
if (!r->m_box || r->m_object->isOutOfFlowPositioned() || r->m_box->isLineBreak())
|
|
continue; // Positioned objects are only participating to figure out their
|
|
// correct static x position. They have no effect on the width.
|
|
// Similarly, line break boxes have no effect on the width.
|
|
if (r->m_object->isText()) {
|
|
RenderText* rt = toRenderText(r->m_object);
|
|
if (textAlign == JUSTIFY && r != trailingSpaceRun && textJustify != TextJustifyNone) {
|
|
if (!isAfterExpansion)
|
|
toInlineTextBox(r->m_box)->setCanHaveLeadingExpansion(true);
|
|
unsigned opportunitiesInRun;
|
|
if (rt->is8Bit())
|
|
opportunitiesInRun = Character::expansionOpportunityCount(rt->characters8() + r->m_start, r->m_stop - r->m_start, r->m_box->direction(), isAfterExpansion);
|
|
else
|
|
opportunitiesInRun = Character::expansionOpportunityCount(rt->characters16() + r->m_start, r->m_stop - r->m_start, r->m_box->direction(), isAfterExpansion);
|
|
expansionOpportunities.append(opportunitiesInRun);
|
|
expansionOpportunityCount += opportunitiesInRun;
|
|
}
|
|
|
|
if (rt->textLength()) {
|
|
if (!r->m_start && needsWordSpacing && isSpaceOrNewline(rt->characterAt(r->m_start)))
|
|
totalLogicalWidth += rt->style(lineInfo.isFirstLine())->font().fontDescription().wordSpacing();
|
|
needsWordSpacing = !isSpaceOrNewline(rt->characterAt(r->m_stop - 1));
|
|
}
|
|
|
|
setLogicalWidthForTextRun(lineBox, r, rt, totalLogicalWidth, lineInfo, textBoxDataMap, verticalPositionCache, wordMeasurements);
|
|
} else {
|
|
isAfterExpansion = false;
|
|
if (!r->m_object->isRenderInline()) {
|
|
RenderBox* renderBox = toRenderBox(r->m_object);
|
|
r->m_box->setLogicalWidth(logicalWidthForChild(renderBox).toFloat());
|
|
totalLogicalWidth += marginStartForChild(renderBox) + marginEndForChild(renderBox);
|
|
}
|
|
}
|
|
|
|
totalLogicalWidth += r->m_box->logicalWidth();
|
|
previousObject = r->m_object;
|
|
}
|
|
|
|
if (isAfterExpansion && !expansionOpportunities.isEmpty()) {
|
|
expansionOpportunities.last()--;
|
|
expansionOpportunityCount--;
|
|
}
|
|
|
|
updateLogicalWidthForAlignment(textAlign, lineBox, trailingSpaceRun, logicalLeft, totalLogicalWidth, availableLogicalWidth, expansionOpportunityCount);
|
|
|
|
computeExpansionForJustifiedText(firstRun, trailingSpaceRun, expansionOpportunities, expansionOpportunityCount, totalLogicalWidth, availableLogicalWidth);
|
|
|
|
return r;
|
|
}
|
|
|
|
void RenderBlockFlow::computeBlockDirectionPositionsForLine(RootInlineBox* lineBox, BidiRun* firstRun, GlyphOverflowAndFallbackFontsMap& textBoxDataMap,
|
|
VerticalPositionCache& verticalPositionCache)
|
|
{
|
|
setLogicalHeight(lineBox->alignBoxesInBlockDirection(logicalHeight(), textBoxDataMap, verticalPositionCache));
|
|
|
|
// Now make sure we place replaced render objects correctly.
|
|
for (BidiRun* r = firstRun; r; r = r->next()) {
|
|
ASSERT(r->m_box);
|
|
if (!r->m_box)
|
|
continue; // Skip runs with no line boxes.
|
|
|
|
// Align positioned boxes with the top of the line box. This is
|
|
// a reasonable approximation of an appropriate y position.
|
|
if (r->m_object->isOutOfFlowPositioned())
|
|
r->m_box->setLogicalTop(logicalHeight().toFloat());
|
|
|
|
// Position is used to properly position both replaced elements and
|
|
// to update the static normal flow x/y of positioned elements.
|
|
if (r->m_object->isText())
|
|
toRenderText(r->m_object)->positionLineBox(r->m_box);
|
|
else if (r->m_object->isBox())
|
|
toRenderBox(r->m_object)->positionLineBox(r->m_box);
|
|
}
|
|
}
|
|
|
|
// This function constructs line boxes for all of the text runs in the resolver and computes their position.
|
|
RootInlineBox* RenderBlockFlow::createLineBoxesFromBidiRuns(unsigned bidiLevel, BidiRunList<BidiRun>& bidiRuns, const InlineIterator& end, LineInfo& lineInfo, VerticalPositionCache& verticalPositionCache, BidiRun* trailingSpaceRun, WordMeasurements& wordMeasurements)
|
|
{
|
|
if (!bidiRuns.runCount())
|
|
return 0;
|
|
|
|
// FIXME: Why is this only done when we had runs?
|
|
lineInfo.setLastLine(!end.object());
|
|
|
|
RootInlineBox* lineBox = constructLine(bidiRuns, lineInfo);
|
|
if (!lineBox)
|
|
return 0;
|
|
|
|
lineBox->setBidiLevel(bidiLevel);
|
|
lineBox->setEndsWithBreak(lineInfo.previousLineBrokeCleanly());
|
|
|
|
GlyphOverflowAndFallbackFontsMap textBoxDataMap;
|
|
|
|
// Now we position all of our text runs horizontally.
|
|
computeInlineDirectionPositionsForLine(lineBox, lineInfo, bidiRuns.firstRun(), trailingSpaceRun, end.atEnd(), textBoxDataMap, verticalPositionCache, wordMeasurements);
|
|
|
|
// Now position our text runs vertically.
|
|
computeBlockDirectionPositionsForLine(lineBox, bidiRuns.firstRun(), textBoxDataMap, verticalPositionCache);
|
|
|
|
// Compute our overflow now.
|
|
lineBox->computeOverflow(lineBox->lineTop(), lineBox->lineBottom(), textBoxDataMap);
|
|
|
|
return lineBox;
|
|
}
|
|
|
|
static void deleteLineRange(LineLayoutState& layoutState, RootInlineBox* startLine, RootInlineBox* stopLine = 0)
|
|
{
|
|
RootInlineBox* boxToDelete = startLine;
|
|
while (boxToDelete && boxToDelete != stopLine) {
|
|
layoutState.updatePaintInvalidationRangeFromBox(boxToDelete);
|
|
// Note: deleteLineRange(firstRootBox()) is not identical to deleteLineBoxTree().
|
|
// deleteLineBoxTree uses nextLineBox() instead of nextRootBox() when traversing.
|
|
RootInlineBox* next = boxToDelete->nextRootBox();
|
|
boxToDelete->deleteLine();
|
|
boxToDelete = next;
|
|
}
|
|
}
|
|
|
|
void RenderBlockFlow::layoutRunsAndFloats(LineLayoutState& layoutState)
|
|
{
|
|
// We want to skip ahead to the first dirty line
|
|
InlineBidiResolver resolver;
|
|
RootInlineBox* startLine = determineStartPosition(layoutState, resolver);
|
|
|
|
// We also find the first clean line and extract these lines. We will add them back
|
|
// if we determine that we're able to synchronize after handling all our dirty lines.
|
|
InlineIterator cleanLineStart;
|
|
BidiStatus cleanLineBidiStatus;
|
|
if (!layoutState.isFullLayout() && startLine)
|
|
determineEndPosition(layoutState, startLine, cleanLineStart, cleanLineBidiStatus);
|
|
|
|
if (startLine) {
|
|
if (!layoutState.usesPaintInvalidationBounds())
|
|
layoutState.setPaintInvalidationRange(logicalHeight());
|
|
deleteLineRange(layoutState, startLine);
|
|
}
|
|
|
|
layoutRunsAndFloatsInRange(layoutState, resolver, cleanLineStart, cleanLineBidiStatus);
|
|
linkToEndLineIfNeeded(layoutState);
|
|
markDirtyFloatsForPaintInvalidation(layoutState.floats());
|
|
}
|
|
|
|
// Before restarting the layout loop with a new logicalHeight, remove all floats that were added and reset the resolver.
|
|
inline const InlineIterator& RenderBlockFlow::restartLayoutRunsAndFloatsInRange(LayoutUnit oldLogicalHeight, LayoutUnit newLogicalHeight, FloatingObject* lastFloatFromPreviousLine, InlineBidiResolver& resolver, const InlineIterator& oldEnd)
|
|
{
|
|
setLogicalHeight(newLogicalHeight);
|
|
resolver.setPositionIgnoringNestedIsolates(oldEnd);
|
|
return oldEnd;
|
|
}
|
|
|
|
void RenderBlockFlow::layoutRunsAndFloatsInRange(LineLayoutState& layoutState,
|
|
InlineBidiResolver& resolver, const InlineIterator& cleanLineStart,
|
|
const BidiStatus& cleanLineBidiStatus)
|
|
{
|
|
RenderStyle* styleToUse = style();
|
|
LineMidpointState& lineMidpointState = resolver.midpointState();
|
|
InlineIterator endOfLine = resolver.position();
|
|
bool checkForEndLineMatch = layoutState.endLine();
|
|
RenderTextInfo renderTextInfo;
|
|
VerticalPositionCache verticalPositionCache;
|
|
|
|
LineBreaker lineBreaker(this);
|
|
|
|
while (!endOfLine.atEnd()) {
|
|
// FIXME: Is this check necessary before the first iteration or can it be moved to the end?
|
|
if (checkForEndLineMatch) {
|
|
layoutState.setEndLineMatched(matchedEndLine(layoutState, resolver, cleanLineStart, cleanLineBidiStatus));
|
|
if (layoutState.endLineMatched()) {
|
|
resolver.setPosition(InlineIterator(resolver.position().root(), 0, 0), 0);
|
|
break;
|
|
}
|
|
}
|
|
|
|
lineMidpointState.reset();
|
|
|
|
layoutState.lineInfo().setEmpty(true);
|
|
layoutState.lineInfo().resetRunsFromLeadingWhitespace();
|
|
|
|
bool isNewUBAParagraph = layoutState.lineInfo().previousLineBrokeCleanly();
|
|
FloatingObject* lastFloatFromPreviousLine = 0;
|
|
|
|
WordMeasurements wordMeasurements;
|
|
endOfLine = lineBreaker.nextLineBreak(resolver, layoutState.lineInfo(), renderTextInfo,
|
|
lastFloatFromPreviousLine, wordMeasurements);
|
|
renderTextInfo.m_lineBreakIterator.resetPriorContext();
|
|
if (resolver.position().atEnd()) {
|
|
// FIXME: We shouldn't be creating any runs in nextLineBreak to begin with!
|
|
// Once BidiRunList is separated from BidiResolver this will not be needed.
|
|
resolver.runs().deleteRuns();
|
|
resolver.markCurrentRunEmpty(); // FIXME: This can probably be replaced by an ASSERT (or just removed).
|
|
layoutState.setCheckForFloatsFromLastLine(true);
|
|
resolver.setPosition(InlineIterator(resolver.position().root(), 0, 0), 0);
|
|
break;
|
|
}
|
|
|
|
ASSERT(endOfLine != resolver.position());
|
|
|
|
// This is a short-cut for empty lines.
|
|
if (layoutState.lineInfo().isEmpty()) {
|
|
if (lastRootBox())
|
|
lastRootBox()->setLineBreakInfo(endOfLine.object(), endOfLine.offset(), resolver.status());
|
|
} else {
|
|
VisualDirectionOverride override = (styleToUse->rtlOrdering() == VisualOrder ? (styleToUse->direction() == LTR ? VisualLeftToRightOverride : VisualRightToLeftOverride) : NoVisualOverride);
|
|
if (isNewUBAParagraph && styleToUse->unicodeBidi() == Plaintext && !resolver.context()->parent()) {
|
|
TextDirection direction = determinePlaintextDirectionality(resolver.position().root(), resolver.position().object(), resolver.position().offset());
|
|
resolver.setStatus(BidiStatus(direction, isOverride(styleToUse->unicodeBidi())));
|
|
}
|
|
// FIXME: This ownership is reversed. We should own the BidiRunList and pass it to createBidiRunsForLine.
|
|
BidiRunList<BidiRun>& bidiRuns = resolver.runs();
|
|
constructBidiRunsForLine(resolver, bidiRuns, endOfLine, override, layoutState.lineInfo().previousLineBrokeCleanly(), isNewUBAParagraph);
|
|
ASSERT(resolver.position() == endOfLine);
|
|
|
|
BidiRun* trailingSpaceRun = resolver.trailingSpaceRun();
|
|
|
|
if (bidiRuns.runCount() && lineBreaker.lineWasHyphenated())
|
|
bidiRuns.logicallyLastRun()->m_hasHyphen = true;
|
|
|
|
// Now that the runs have been ordered, we create the line boxes.
|
|
// At the same time we figure out where border/padding/margin should be applied for
|
|
// inline flow boxes.
|
|
|
|
RootInlineBox* lineBox = createLineBoxesFromBidiRuns(resolver.status().context->level(), bidiRuns, endOfLine, layoutState.lineInfo(), verticalPositionCache, trailingSpaceRun, wordMeasurements);
|
|
|
|
bidiRuns.deleteRuns();
|
|
resolver.markCurrentRunEmpty(); // FIXME: This can probably be replaced by an ASSERT (or just removed).
|
|
|
|
if (lineBox) {
|
|
lineBox->setLineBreakInfo(endOfLine.object(), endOfLine.offset(), resolver.status());
|
|
if (layoutState.usesPaintInvalidationBounds())
|
|
layoutState.updatePaintInvalidationRangeFromBox(lineBox);
|
|
}
|
|
}
|
|
|
|
for (size_t i = 0; i < lineBreaker.positionedObjects().size(); ++i)
|
|
setStaticPositions(this, lineBreaker.positionedObjects()[i]);
|
|
|
|
if (!layoutState.lineInfo().isEmpty()) {
|
|
layoutState.lineInfo().setFirstLine(false);
|
|
clearFloats(lineBreaker.clear());
|
|
}
|
|
|
|
lineMidpointState.reset();
|
|
resolver.setPosition(endOfLine, numberOfIsolateAncestors(endOfLine));
|
|
}
|
|
|
|
clearDidBreakAtLineToAvoidWidow();
|
|
}
|
|
|
|
void RenderBlockFlow::linkToEndLineIfNeeded(LineLayoutState& layoutState)
|
|
{
|
|
if (layoutState.endLine()) {
|
|
if (layoutState.endLineMatched()) {
|
|
// Attach all the remaining lines, and then adjust their y-positions as needed.
|
|
LayoutUnit delta = logicalHeight() - layoutState.endLineLogicalTop();
|
|
for (RootInlineBox* line = layoutState.endLine(); line; line = line->nextRootBox()) {
|
|
line->attachLine();
|
|
if (delta) {
|
|
layoutState.updatePaintInvalidationRangeFromBox(line, delta);
|
|
line->adjustBlockDirectionPosition(delta.toFloat());
|
|
}
|
|
}
|
|
setLogicalHeight(lastRootBox()->lineBottomWithLeading());
|
|
} else {
|
|
// Delete all the remaining lines.
|
|
deleteLineRange(layoutState, layoutState.endLine());
|
|
}
|
|
}
|
|
}
|
|
|
|
void RenderBlockFlow::markDirtyFloatsForPaintInvalidation(Vector<FloatWithRect>& floats)
|
|
{
|
|
size_t floatCount = floats.size();
|
|
// Floats that did not have layout did not paint invalidations when we laid them out. They would have
|
|
// painted by now if they had moved, but if they stayed at (0, 0), they still need to be
|
|
// painted.
|
|
for (size_t i = 0; i < floatCount; ++i) {
|
|
if (!floats[i].everHadLayout) {
|
|
RenderBox* f = floats[i].object;
|
|
if (!f->x() && !f->y() && f->checkForPaintInvalidation()) {
|
|
f->setShouldDoFullPaintInvalidation(true);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
struct InlineMinMaxIterator {
|
|
/* InlineMinMaxIterator is a class that will iterate over all render objects that contribute to
|
|
inline min/max width calculations. Note the following about the way it walks:
|
|
(1) Positioned content is skipped (since it does not contribute to min/max width of a block)
|
|
(2) We do not drill into the children of floats or replaced elements, since you can't break
|
|
in the middle of such an element.
|
|
(3) Inline flows (e.g., <a>, <span>, <i>) are walked twice, since each side can have
|
|
distinct borders/margin/padding that contribute to the min/max width.
|
|
*/
|
|
RenderObject* parent;
|
|
RenderObject* current;
|
|
bool endOfInline;
|
|
|
|
InlineMinMaxIterator(RenderObject* p, bool end = false)
|
|
: parent(p), current(p), endOfInline(end)
|
|
{
|
|
|
|
}
|
|
|
|
RenderObject* next();
|
|
};
|
|
|
|
RenderObject* InlineMinMaxIterator::next()
|
|
{
|
|
RenderObject* result = 0;
|
|
bool oldEndOfInline = endOfInline;
|
|
endOfInline = false;
|
|
while (current || current == parent) {
|
|
if (!oldEndOfInline && (current == parent || (!current->isFloating() && !current->isReplaced() && !current->isOutOfFlowPositioned())))
|
|
result = current->slowFirstChild();
|
|
|
|
if (!result) {
|
|
// We hit the end of our inline. (It was empty, e.g., <span></span>.)
|
|
if (!oldEndOfInline && current->isRenderInline()) {
|
|
result = current;
|
|
endOfInline = true;
|
|
break;
|
|
}
|
|
|
|
while (current && current != parent) {
|
|
result = current->nextSibling();
|
|
if (result)
|
|
break;
|
|
current = current->parent();
|
|
if (current && current != parent && current->isRenderInline()) {
|
|
result = current;
|
|
endOfInline = true;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!result)
|
|
break;
|
|
|
|
if (!result->isOutOfFlowPositioned() && (result->isText() || result->isFloating() || result->isReplaced() || result->isRenderInline()))
|
|
break;
|
|
|
|
current = result;
|
|
result = 0;
|
|
}
|
|
|
|
// Update our position.
|
|
current = result;
|
|
return current;
|
|
}
|
|
|
|
static LayoutUnit getBPMWidth(LayoutUnit childValue, Length cssUnit)
|
|
{
|
|
if (cssUnit.type() != Auto)
|
|
return (cssUnit.isFixed() ? static_cast<LayoutUnit>(cssUnit.value()) : childValue);
|
|
return 0;
|
|
}
|
|
|
|
static LayoutUnit getBorderPaddingMargin(RenderBoxModelObject* child, bool endOfInline)
|
|
{
|
|
RenderStyle* childStyle = child->style();
|
|
if (endOfInline) {
|
|
return getBPMWidth(child->marginEnd(), childStyle->marginEnd()) +
|
|
getBPMWidth(child->paddingEnd(), childStyle->paddingEnd()) +
|
|
child->borderEnd();
|
|
}
|
|
return getBPMWidth(child->marginStart(), childStyle->marginStart()) +
|
|
getBPMWidth(child->paddingStart(), childStyle->paddingStart()) +
|
|
child->borderStart();
|
|
}
|
|
|
|
static inline void stripTrailingSpace(float& inlineMax, float& inlineMin, RenderObject* trailingSpaceChild)
|
|
{
|
|
if (trailingSpaceChild && trailingSpaceChild->isText()) {
|
|
// Collapse away the trailing space at the end of a block.
|
|
RenderText* t = toRenderText(trailingSpaceChild);
|
|
const UChar space = ' ';
|
|
const Font& font = t->style()->font(); // FIXME: This ignores first-line.
|
|
float spaceWidth = font.width(constructTextRun(t, font, &space, 1, t->style(), LTR));
|
|
inlineMax -= spaceWidth + font.fontDescription().wordSpacing();
|
|
if (inlineMin > inlineMax)
|
|
inlineMin = inlineMax;
|
|
}
|
|
}
|
|
|
|
static inline void updatePreferredWidth(LayoutUnit& preferredWidth, float& result)
|
|
{
|
|
LayoutUnit snappedResult = LayoutUnit::fromFloatCeil(result);
|
|
preferredWidth = std::max(snappedResult, preferredWidth);
|
|
}
|
|
|
|
// When converting between floating point and LayoutUnits we risk losing precision
|
|
// with each conversion. When this occurs while accumulating our preferred widths,
|
|
// we can wind up with a line width that's larger than our maxPreferredWidth due to
|
|
// pure float accumulation.
|
|
static inline LayoutUnit adjustFloatForSubPixelLayout(float value)
|
|
{
|
|
return LayoutUnit::fromFloatCeil(value);
|
|
}
|
|
|
|
// FIXME: This function should be broken into something less monolithic.
|
|
// FIXME: The main loop here is very similar to LineBreaker::nextSegmentBreak. They can probably reuse code.
|
|
void RenderBlockFlow::computeInlinePreferredLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth)
|
|
{
|
|
float inlineMax = 0;
|
|
float inlineMin = 0;
|
|
|
|
RenderStyle* styleToUse = style();
|
|
RenderBlock* containingBlock = this->containingBlock();
|
|
LayoutUnit cw = containingBlock ? containingBlock->contentLogicalWidth() : LayoutUnit();
|
|
|
|
// If we are at the start of a line, we want to ignore all white-space.
|
|
// Also strip spaces if we previously had text that ended in a trailing space.
|
|
bool stripFrontSpaces = true;
|
|
RenderObject* trailingSpaceChild = 0;
|
|
|
|
bool autoWrap, oldAutoWrap;
|
|
autoWrap = oldAutoWrap = styleToUse->autoWrap();
|
|
|
|
InlineMinMaxIterator childIterator(this);
|
|
|
|
// Only gets added to the max preffered width once.
|
|
bool addedTextIndent = false;
|
|
// Signals the text indent was more negative than the min preferred width
|
|
bool hasRemainingNegativeTextIndent = false;
|
|
|
|
LayoutUnit textIndent = minimumValueForLength(styleToUse->textIndent(), cw);
|
|
RenderObject* prevFloat = 0;
|
|
bool isPrevChildInlineFlow = false;
|
|
bool shouldBreakLineAfterText = false;
|
|
while (RenderObject* child = childIterator.next()) {
|
|
autoWrap = child->isReplaced() ? child->parent()->style()->autoWrap() :
|
|
child->style()->autoWrap();
|
|
|
|
// Step One: determine whether or not we need to go ahead and
|
|
// terminate our current line. Each discrete chunk can become
|
|
// the new min-width, if it is the widest chunk seen so far, and
|
|
// it can also become the max-width.
|
|
|
|
// Children fall into three categories:
|
|
// (1) An inline flow object. These objects always have a min/max of 0,
|
|
// and are included in the iteration solely so that their margins can
|
|
// be added in.
|
|
//
|
|
// (2) An inline non-text non-flow object, e.g., an inline replaced element.
|
|
// These objects can always be on a line by themselves, so in this situation
|
|
// we need to go ahead and break the current line, and then add in our own
|
|
// margins and min/max width on its own line, and then terminate the line.
|
|
//
|
|
// (3) A text object. Text runs can have breakable characters at the start,
|
|
// the middle or the end. They may also lose whitespace off the front if
|
|
// we're already ignoring whitespace. In order to compute accurate min-width
|
|
// information, we need three pieces of information.
|
|
// (a) the min-width of the first non-breakable run. Should be 0 if the text string
|
|
// starts with whitespace.
|
|
// (b) the min-width of the last non-breakable run. Should be 0 if the text string
|
|
// ends with whitespace.
|
|
// (c) the min/max width of the string (trimmed for whitespace).
|
|
//
|
|
// If the text string starts with whitespace, then we need to go ahead and
|
|
// terminate our current line (unless we're already in a whitespace stripping
|
|
// mode.
|
|
//
|
|
// If the text string has a breakable character in the middle, but didn't start
|
|
// with whitespace, then we add the width of the first non-breakable run and
|
|
// then end the current line. We then need to use the intermediate min/max width
|
|
// values (if any of them are larger than our current min/max). We then look at
|
|
// the width of the last non-breakable run and use that to start a new line
|
|
// (unless we end in whitespace).
|
|
RenderStyle* childStyle = child->style();
|
|
float childMin = 0;
|
|
float childMax = 0;
|
|
|
|
if (!child->isText()) {
|
|
// Case (1) and (2). Inline replaced and inline flow elements.
|
|
if (child->isRenderInline()) {
|
|
// Add in padding/border/margin from the appropriate side of
|
|
// the element.
|
|
float bpm = getBorderPaddingMargin(toRenderInline(child), childIterator.endOfInline).toFloat();
|
|
childMin += bpm;
|
|
childMax += bpm;
|
|
|
|
inlineMin += childMin;
|
|
inlineMax += childMax;
|
|
|
|
child->clearPreferredLogicalWidthsDirty();
|
|
} else {
|
|
// Inline replaced elts add in their margins to their min/max values.
|
|
LayoutUnit margins = 0;
|
|
Length startMargin = childStyle->marginStart();
|
|
Length endMargin = childStyle->marginEnd();
|
|
if (startMargin.isFixed())
|
|
margins += adjustFloatForSubPixelLayout(startMargin.value());
|
|
if (endMargin.isFixed())
|
|
margins += adjustFloatForSubPixelLayout(endMargin.value());
|
|
childMin += margins.ceilToFloat();
|
|
childMax += margins.ceilToFloat();
|
|
}
|
|
}
|
|
|
|
if (!child->isRenderInline() && !child->isText()) {
|
|
// Case (2). Inline replaced elements and floats.
|
|
// Go ahead and terminate the current line as far as
|
|
// minwidth is concerned.
|
|
LayoutUnit childMinPreferredLogicalWidth = child->minPreferredLogicalWidth();
|
|
LayoutUnit childMaxPreferredLogicalWidth = child->maxPreferredLogicalWidth();
|
|
childMin += childMinPreferredLogicalWidth.ceilToFloat();
|
|
childMax += childMaxPreferredLogicalWidth.ceilToFloat();
|
|
|
|
bool clearPreviousFloat;
|
|
if (child->isFloating()) {
|
|
clearPreviousFloat = (prevFloat
|
|
&& ((prevFloat->style()->floating() == LeftFloat && (childStyle->clear() & CLEFT))
|
|
|| (prevFloat->style()->floating() == RightFloat && (childStyle->clear() & CRIGHT))));
|
|
prevFloat = child;
|
|
} else {
|
|
clearPreviousFloat = false;
|
|
}
|
|
|
|
bool canBreakReplacedElement = true;
|
|
if ((canBreakReplacedElement && (autoWrap || oldAutoWrap) && (!isPrevChildInlineFlow || shouldBreakLineAfterText)) || clearPreviousFloat) {
|
|
updatePreferredWidth(minLogicalWidth, inlineMin);
|
|
inlineMin = 0;
|
|
}
|
|
|
|
// If we're supposed to clear the previous float, then terminate maxwidth as well.
|
|
if (clearPreviousFloat) {
|
|
updatePreferredWidth(maxLogicalWidth, inlineMax);
|
|
inlineMax = 0;
|
|
}
|
|
|
|
// Add in text-indent. This is added in only once.
|
|
if (!addedTextIndent && !child->isFloating()) {
|
|
float ceiledTextIndent = textIndent.ceilToFloat();
|
|
childMin += ceiledTextIndent;
|
|
childMax += ceiledTextIndent;
|
|
|
|
if (childMin < 0)
|
|
textIndent = adjustFloatForSubPixelLayout(childMin);
|
|
else
|
|
addedTextIndent = true;
|
|
}
|
|
|
|
// Add our width to the max.
|
|
inlineMax += std::max<float>(0, childMax);
|
|
|
|
if (!autoWrap || !canBreakReplacedElement || (isPrevChildInlineFlow && !shouldBreakLineAfterText)) {
|
|
if (child->isFloating())
|
|
updatePreferredWidth(minLogicalWidth, childMin);
|
|
else
|
|
inlineMin += childMin;
|
|
} else {
|
|
// Now check our line.
|
|
updatePreferredWidth(minLogicalWidth, childMin);
|
|
|
|
// Now start a new line.
|
|
inlineMin = 0;
|
|
}
|
|
|
|
if (autoWrap && canBreakReplacedElement && isPrevChildInlineFlow) {
|
|
updatePreferredWidth(minLogicalWidth, inlineMin);
|
|
inlineMin = 0;
|
|
}
|
|
|
|
// We are no longer stripping whitespace at the start of
|
|
// a line.
|
|
if (!child->isFloating()) {
|
|
stripFrontSpaces = false;
|
|
trailingSpaceChild = 0;
|
|
}
|
|
} else if (child->isText()) {
|
|
// Case (3). Text.
|
|
RenderText* t = toRenderText(child);
|
|
|
|
// Determine if we have a breakable character. Pass in
|
|
// whether or not we should ignore any spaces at the front
|
|
// of the string. If those are going to be stripped out,
|
|
// then they shouldn't be considered in the breakable char
|
|
// check.
|
|
bool hasBreakableChar, hasBreak;
|
|
float firstLineMinWidth, lastLineMinWidth;
|
|
bool hasBreakableStart, hasBreakableEnd;
|
|
float firstLineMaxWidth, lastLineMaxWidth;
|
|
t->trimmedPrefWidths(inlineMax,
|
|
firstLineMinWidth, hasBreakableStart, lastLineMinWidth, hasBreakableEnd,
|
|
hasBreakableChar, hasBreak, firstLineMaxWidth, lastLineMaxWidth,
|
|
childMin, childMax, stripFrontSpaces, styleToUse->direction());
|
|
|
|
// This text object will not be rendered, but it may still provide a breaking opportunity.
|
|
if (!hasBreak && !childMax) {
|
|
if (autoWrap && (hasBreakableStart || hasBreakableEnd)) {
|
|
updatePreferredWidth(minLogicalWidth, inlineMin);
|
|
inlineMin = 0;
|
|
}
|
|
continue;
|
|
}
|
|
|
|
if (stripFrontSpaces)
|
|
trailingSpaceChild = child;
|
|
else
|
|
trailingSpaceChild = 0;
|
|
|
|
// Add in text-indent. This is added in only once.
|
|
float ti = 0;
|
|
if (!addedTextIndent || hasRemainingNegativeTextIndent) {
|
|
ti = textIndent.ceilToFloat();
|
|
childMin += ti;
|
|
firstLineMinWidth += ti;
|
|
|
|
// It the text indent negative and larger than the child minimum, we re-use the remainder
|
|
// in future minimum calculations, but using the negative value again on the maximum
|
|
// will lead to under-counting the max pref width.
|
|
if (!addedTextIndent) {
|
|
childMax += ti;
|
|
firstLineMaxWidth += ti;
|
|
addedTextIndent = true;
|
|
}
|
|
|
|
if (childMin < 0) {
|
|
textIndent = childMin;
|
|
hasRemainingNegativeTextIndent = true;
|
|
}
|
|
}
|
|
|
|
// If we have no breakable characters at all,
|
|
// then this is the easy case. We add ourselves to the current
|
|
// min and max and continue.
|
|
if (!hasBreakableChar) {
|
|
inlineMin += childMin;
|
|
} else {
|
|
if (hasBreakableStart) {
|
|
updatePreferredWidth(minLogicalWidth, inlineMin);
|
|
} else {
|
|
inlineMin += firstLineMinWidth;
|
|
updatePreferredWidth(minLogicalWidth, inlineMin);
|
|
childMin -= ti;
|
|
}
|
|
|
|
inlineMin = childMin;
|
|
|
|
if (hasBreakableEnd) {
|
|
updatePreferredWidth(minLogicalWidth, inlineMin);
|
|
inlineMin = 0;
|
|
shouldBreakLineAfterText = false;
|
|
} else {
|
|
updatePreferredWidth(minLogicalWidth, inlineMin);
|
|
inlineMin = lastLineMinWidth;
|
|
shouldBreakLineAfterText = true;
|
|
}
|
|
}
|
|
|
|
if (hasBreak) {
|
|
inlineMax += firstLineMaxWidth;
|
|
updatePreferredWidth(maxLogicalWidth, inlineMax);
|
|
updatePreferredWidth(maxLogicalWidth, childMax);
|
|
inlineMax = lastLineMaxWidth;
|
|
addedTextIndent = true;
|
|
} else {
|
|
inlineMax += std::max<float>(0, childMax);
|
|
}
|
|
}
|
|
|
|
if (!child->isText() && child->isRenderInline())
|
|
isPrevChildInlineFlow = true;
|
|
else
|
|
isPrevChildInlineFlow = false;
|
|
|
|
oldAutoWrap = autoWrap;
|
|
}
|
|
|
|
if (styleToUse->collapseWhiteSpace())
|
|
stripTrailingSpace(inlineMax, inlineMin, trailingSpaceChild);
|
|
|
|
updatePreferredWidth(minLogicalWidth, inlineMin);
|
|
updatePreferredWidth(maxLogicalWidth, inlineMax);
|
|
}
|
|
|
|
void RenderBlockFlow::layoutInlineChildren(bool relayoutChildren, LayoutUnit& paintInvalidationLogicalTop, LayoutUnit& paintInvalidationLogicalBottom, LayoutUnit afterEdge)
|
|
{
|
|
// Figure out if we should clear out our line boxes.
|
|
// FIXME: Handle resize eventually!
|
|
bool isFullLayout = !firstLineBox() || selfNeedsLayout() || relayoutChildren;
|
|
LineLayoutState layoutState(isFullLayout, paintInvalidationLogicalTop, paintInvalidationLogicalBottom);
|
|
|
|
if (isFullLayout) {
|
|
// Ensure the old line boxes will be erased.
|
|
if (firstLineBox())
|
|
setShouldDoFullPaintInvalidation(true);
|
|
lineBoxes()->deleteLineBoxes();
|
|
}
|
|
|
|
// Text truncation kicks in in two cases:
|
|
// 1) If your overflow isn't visible and your text-overflow-mode isn't clip.
|
|
// 2) If you're an anonymous block with a block parent that satisfies #1 that was created
|
|
// to accomodate a block that has inline and block children. This excludes parents where
|
|
// canCollapseAnonymousBlockChild is false, notabley flex items and grid items.
|
|
// FIXME: CSS3 says that descendants that are clipped must also know how to truncate. This is insanely
|
|
// difficult to figure out in general (especially in the middle of doing layout), so we only handle the
|
|
// simple case of an anonymous block truncating when it's parent is clipped.
|
|
bool hasTextOverflow = (style()->textOverflow() && hasOverflowClip())
|
|
|| (isAnonymousBlock() && parent() && parent()->isRenderBlock() && toRenderBlock(parent())->canCollapseAnonymousBlockChild()
|
|
&& parent()->style()->textOverflow() && parent()->hasOverflowClip());
|
|
|
|
// Walk all the lines and delete our ellipsis line boxes if they exist.
|
|
if (hasTextOverflow)
|
|
deleteEllipsisLineBoxes();
|
|
|
|
if (firstChild()) {
|
|
// In full layout mode, clear the line boxes of children upfront. Otherwise,
|
|
// siblings can run into stale root lineboxes during layout. Then layout
|
|
// the replaced elements later. In partial layout mode, line boxes are not
|
|
// deleted and only dirtied. In that case, we can layout the replaced
|
|
// elements at the same time.
|
|
Vector<RenderBox*> replacedChildren;
|
|
for (InlineWalker walker(this); !walker.atEnd(); walker.advance()) {
|
|
RenderObject* o = walker.current();
|
|
|
|
if (!layoutState.hasInlineChild() && o->isInline())
|
|
layoutState.setHasInlineChild(true);
|
|
|
|
if (o->isReplaced() || o->isFloating() || o->isOutOfFlowPositioned()) {
|
|
RenderBox* box = toRenderBox(o);
|
|
|
|
updateBlockChildDirtyBitsBeforeLayout(relayoutChildren, box);
|
|
|
|
if (o->isOutOfFlowPositioned())
|
|
o->containingBlock()->insertPositionedObject(box);
|
|
else if (o->isFloating())
|
|
layoutState.floats().append(FloatWithRect(box));
|
|
else if (isFullLayout || o->needsLayout()) {
|
|
// Replaced element.
|
|
box->dirtyLineBoxes(isFullLayout);
|
|
if (isFullLayout)
|
|
replacedChildren.append(box);
|
|
else
|
|
o->layoutIfNeeded();
|
|
}
|
|
} else if (o->isText() || (o->isRenderInline() && !walker.atEndOfInline())) {
|
|
if (!o->isText())
|
|
toRenderInline(o)->updateAlwaysCreateLineBoxes(layoutState.isFullLayout());
|
|
if (layoutState.isFullLayout() || o->selfNeedsLayout())
|
|
dirtyLineBoxesForRenderer(o, layoutState.isFullLayout());
|
|
o->clearNeedsLayout();
|
|
}
|
|
}
|
|
|
|
for (size_t i = 0; i < replacedChildren.size(); i++)
|
|
replacedChildren[i]->layoutIfNeeded();
|
|
|
|
layoutRunsAndFloats(layoutState);
|
|
}
|
|
|
|
// Expand the last line to accommodate Ruby and emphasis marks.
|
|
int lastLineAnnotationsAdjustment = 0;
|
|
if (lastRootBox()) {
|
|
LayoutUnit lowestAllowedPosition = std::max(lastRootBox()->lineBottom(), logicalHeight() + paddingAfter());
|
|
lastLineAnnotationsAdjustment = lastRootBox()->computeUnderAnnotationAdjustment(lowestAllowedPosition);
|
|
}
|
|
|
|
// Now add in the bottom border/padding.
|
|
setLogicalHeight(logicalHeight() + lastLineAnnotationsAdjustment + afterEdge);
|
|
|
|
if (!firstLineBox() && hasLineIfEmpty())
|
|
setLogicalHeight(logicalHeight() + lineHeight(true, HorizontalLine, PositionOfInteriorLineBoxes));
|
|
|
|
// See if we have any lines that spill out of our block. If we do, then we will possibly need to
|
|
// truncate text.
|
|
if (hasTextOverflow)
|
|
checkLinesForTextOverflow();
|
|
|
|
// Ensure the new line boxes will be painted.
|
|
if (isFullLayout && firstLineBox())
|
|
setShouldDoFullPaintInvalidation(true);
|
|
}
|
|
|
|
void RenderBlockFlow::checkFloatsInCleanLine(RootInlineBox* line, Vector<FloatWithRect>& floats, size_t& floatIndex, bool& encounteredNewFloat, bool& dirtiedByFloat)
|
|
{
|
|
Vector<RenderBox*>* cleanLineFloats = line->floatsPtr();
|
|
if (!cleanLineFloats)
|
|
return;
|
|
|
|
Vector<RenderBox*>::iterator end = cleanLineFloats->end();
|
|
for (Vector<RenderBox*>::iterator it = cleanLineFloats->begin(); it != end; ++it) {
|
|
RenderBox* floatingBox = *it;
|
|
floatingBox->layoutIfNeeded();
|
|
LayoutSize newSize(floatingBox->width() + floatingBox->marginWidth(), floatingBox->height() + floatingBox->marginHeight());
|
|
if (floats[floatIndex].object != floatingBox) {
|
|
encounteredNewFloat = true;
|
|
return;
|
|
}
|
|
|
|
if (floats[floatIndex].rect.size() != newSize) {
|
|
LayoutUnit floatTop = floats[floatIndex].rect.y();
|
|
LayoutUnit floatHeight = std::max(floats[floatIndex].rect.height(), newSize.height());
|
|
floatHeight = std::min(floatHeight, LayoutUnit::max() - floatTop);
|
|
line->markDirty();
|
|
markLinesDirtyInBlockRange(line->lineBottomWithLeading(), floatTop + floatHeight, line);
|
|
floats[floatIndex].rect.setSize(newSize);
|
|
dirtiedByFloat = true;
|
|
}
|
|
floatIndex++;
|
|
}
|
|
}
|
|
|
|
RootInlineBox* RenderBlockFlow::determineStartPosition(LineLayoutState& layoutState, InlineBidiResolver& resolver)
|
|
{
|
|
RootInlineBox* curr = 0;
|
|
RootInlineBox* last = 0;
|
|
|
|
// FIXME: This entire float-checking block needs to be broken into a new function.
|
|
bool dirtiedByFloat = false;
|
|
if (!layoutState.isFullLayout()) {
|
|
size_t floatIndex = 0;
|
|
for (curr = firstRootBox(); curr && !curr->isDirty(); curr = curr->nextRootBox()) {
|
|
// If a new float has been inserted before this line or before its last known float, just do a full layout.
|
|
bool encounteredNewFloat = false;
|
|
checkFloatsInCleanLine(curr, layoutState.floats(), floatIndex, encounteredNewFloat, dirtiedByFloat);
|
|
if (encounteredNewFloat)
|
|
layoutState.markForFullLayout();
|
|
|
|
if (dirtiedByFloat || layoutState.isFullLayout())
|
|
break;
|
|
}
|
|
// Check if a new float has been inserted after the last known float.
|
|
if (!curr && floatIndex < layoutState.floats().size())
|
|
layoutState.markForFullLayout();
|
|
}
|
|
|
|
if (layoutState.isFullLayout()) {
|
|
// If we encountered a new float and have inline children, mark ourself to force us to issue paint invalidations.
|
|
if (layoutState.hasInlineChild() && !selfNeedsLayout()) {
|
|
setNeedsLayoutAndFullPaintInvalidation(MarkOnlyThis);
|
|
setShouldDoFullPaintInvalidation(true);
|
|
}
|
|
|
|
// FIXME: This should just call deleteLineBoxTree, but that causes
|
|
// crashes for fast/repaint tests.
|
|
curr = firstRootBox();
|
|
while (curr) {
|
|
// Note: This uses nextRootBox() insted of nextLineBox() like deleteLineBoxTree does.
|
|
RootInlineBox* next = curr->nextRootBox();
|
|
curr->deleteLine();
|
|
curr = next;
|
|
}
|
|
ASSERT(!firstLineBox() && !lastLineBox());
|
|
} else {
|
|
if (curr) {
|
|
// We have a dirty line.
|
|
if (RootInlineBox* prevRootBox = curr->prevRootBox()) {
|
|
// We have a previous line.
|
|
if (!dirtiedByFloat && (!prevRootBox->endsWithBreak() || !prevRootBox->lineBreakObj() || (prevRootBox->lineBreakObj()->isText() && prevRootBox->lineBreakPos() >= toRenderText(prevRootBox->lineBreakObj())->textLength())))
|
|
// The previous line didn't break cleanly or broke at a newline
|
|
// that has been deleted, so treat it as dirty too.
|
|
curr = prevRootBox;
|
|
}
|
|
} else {
|
|
// No dirty lines were found.
|
|
// If the last line didn't break cleanly, treat it as dirty.
|
|
if (lastRootBox() && !lastRootBox()->endsWithBreak())
|
|
curr = lastRootBox();
|
|
}
|
|
|
|
// If we have no dirty lines, then last is just the last root box.
|
|
last = curr ? curr->prevRootBox() : lastRootBox();
|
|
}
|
|
|
|
layoutState.lineInfo().setFirstLine(!last);
|
|
layoutState.lineInfo().setPreviousLineBrokeCleanly(!last || last->endsWithBreak());
|
|
|
|
if (last) {
|
|
setLogicalHeight(last->lineBottomWithLeading());
|
|
InlineIterator iter = InlineIterator(this, last->lineBreakObj(), last->lineBreakPos());
|
|
resolver.setPosition(iter, numberOfIsolateAncestors(iter));
|
|
resolver.setStatus(last->lineBreakBidiStatus());
|
|
} else {
|
|
TextDirection direction = style()->direction();
|
|
if (style()->unicodeBidi() == Plaintext)
|
|
direction = determinePlaintextDirectionality(this);
|
|
resolver.setStatus(BidiStatus(direction, isOverride(style()->unicodeBidi())));
|
|
InlineIterator iter = InlineIterator(this, bidiFirstSkippingEmptyInlines(this, resolver.runs(), &resolver), 0);
|
|
resolver.setPosition(iter, numberOfIsolateAncestors(iter));
|
|
}
|
|
return curr;
|
|
}
|
|
|
|
void RenderBlockFlow::determineEndPosition(LineLayoutState& layoutState, RootInlineBox* startLine, InlineIterator& cleanLineStart, BidiStatus& cleanLineBidiStatus)
|
|
{
|
|
ASSERT(!layoutState.endLine());
|
|
size_t floatIndex = layoutState.floatIndex();
|
|
RootInlineBox* last = 0;
|
|
for (RootInlineBox* curr = startLine->nextRootBox(); curr; curr = curr->nextRootBox()) {
|
|
if (!curr->isDirty()) {
|
|
bool encounteredNewFloat = false;
|
|
bool dirtiedByFloat = false;
|
|
checkFloatsInCleanLine(curr, layoutState.floats(), floatIndex, encounteredNewFloat, dirtiedByFloat);
|
|
if (encounteredNewFloat)
|
|
return;
|
|
}
|
|
if (curr->isDirty())
|
|
last = 0;
|
|
else if (!last)
|
|
last = curr;
|
|
}
|
|
|
|
if (!last)
|
|
return;
|
|
|
|
// At this point, |last| is the first line in a run of clean lines that ends with the last line
|
|
// in the block.
|
|
|
|
RootInlineBox* prev = last->prevRootBox();
|
|
cleanLineStart = InlineIterator(this, prev->lineBreakObj(), prev->lineBreakPos());
|
|
cleanLineBidiStatus = prev->lineBreakBidiStatus();
|
|
layoutState.setEndLineLogicalTop(prev->lineBottomWithLeading());
|
|
|
|
for (RootInlineBox* line = last; line; line = line->nextRootBox())
|
|
line->extractLine(); // Disconnect all line boxes from their render objects while preserving
|
|
// their connections to one another.
|
|
|
|
layoutState.setEndLine(last);
|
|
}
|
|
|
|
bool RenderBlockFlow::checkPaginationAndFloatsAtEndLine(LineLayoutState& layoutState)
|
|
{
|
|
// FIXME(sky): Remove this.
|
|
return true;
|
|
}
|
|
|
|
bool RenderBlockFlow::matchedEndLine(LineLayoutState& layoutState, const InlineBidiResolver& resolver, const InlineIterator& endLineStart, const BidiStatus& endLineStatus)
|
|
{
|
|
if (resolver.position() == endLineStart) {
|
|
if (resolver.status() != endLineStatus)
|
|
return false;
|
|
return checkPaginationAndFloatsAtEndLine(layoutState);
|
|
}
|
|
|
|
// The first clean line doesn't match, but we can check a handful of following lines to try
|
|
// to match back up.
|
|
static int numLines = 8; // The # of lines we're willing to match against.
|
|
RootInlineBox* originalEndLine = layoutState.endLine();
|
|
RootInlineBox* line = originalEndLine;
|
|
for (int i = 0; i < numLines && line; i++, line = line->nextRootBox()) {
|
|
if (line->lineBreakObj() == resolver.position().object() && line->lineBreakPos() == resolver.position().offset()) {
|
|
// We have a match.
|
|
if (line->lineBreakBidiStatus() != resolver.status())
|
|
return false; // ...but the bidi state doesn't match.
|
|
|
|
bool matched = false;
|
|
RootInlineBox* result = line->nextRootBox();
|
|
layoutState.setEndLine(result);
|
|
if (result) {
|
|
layoutState.setEndLineLogicalTop(line->lineBottomWithLeading());
|
|
matched = checkPaginationAndFloatsAtEndLine(layoutState);
|
|
}
|
|
|
|
// Now delete the lines that we failed to sync.
|
|
deleteLineRange(layoutState, originalEndLine, result);
|
|
return matched;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
bool RenderBlockFlow::generatesLineBoxesForInlineChild(RenderObject* inlineObj)
|
|
|
|
{
|
|
ASSERT(inlineObj->parent() == this);
|
|
|
|
InlineIterator it(this, inlineObj, 0);
|
|
// FIXME: We should pass correct value for WhitespacePosition.
|
|
while (!it.atEnd() && !requiresLineBox(it))
|
|
it.increment();
|
|
|
|
return !it.atEnd();
|
|
}
|
|
|
|
|
|
void RenderBlockFlow::addOverflowFromInlineChildren()
|
|
{
|
|
LayoutUnit endPadding = hasOverflowClip() ? paddingEnd() : LayoutUnit();
|
|
// FIXME: Need to find another way to do this, since scrollbars could show when we don't want them to.
|
|
if (hasOverflowClip() && !endPadding && node() && node()->isRootEditableElement() && style()->isLeftToRightDirection())
|
|
endPadding = 1;
|
|
for (RootInlineBox* curr = firstRootBox(); curr; curr = curr->nextRootBox()) {
|
|
addLayoutOverflow(curr->paddedLayoutOverflowRect(endPadding));
|
|
LayoutRect visualOverflow = curr->visualOverflowRect(curr->lineTop(), curr->lineBottom());
|
|
addContentsVisualOverflow(visualOverflow);
|
|
}
|
|
}
|
|
|
|
void RenderBlockFlow::deleteEllipsisLineBoxes()
|
|
{
|
|
ETextAlign textAlign = style()->textAlign();
|
|
bool ltr = style()->isLeftToRightDirection();
|
|
bool firstLine = true;
|
|
for (RootInlineBox* curr = firstRootBox(); curr; curr = curr->nextRootBox()) {
|
|
if (curr->hasEllipsisBox()) {
|
|
curr->clearTruncation();
|
|
|
|
// Shift the line back where it belongs if we cannot accomodate an ellipsis.
|
|
float logicalLeft = logicalLeftOffsetForLine(curr->lineTop(), firstLine).toFloat();
|
|
float availableLogicalWidth = logicalRightOffsetForLine(curr->lineTop(), false) - logicalLeft;
|
|
float totalLogicalWidth = curr->logicalWidth();
|
|
updateLogicalWidthForAlignment(textAlign, curr, 0, logicalLeft, totalLogicalWidth, availableLogicalWidth, 0);
|
|
|
|
if (ltr)
|
|
curr->adjustLogicalPosition((logicalLeft - curr->logicalLeft()), 0);
|
|
else
|
|
curr->adjustLogicalPosition(-(curr->logicalLeft() - logicalLeft), 0);
|
|
}
|
|
firstLine = false;
|
|
}
|
|
}
|
|
|
|
void RenderBlockFlow::checkLinesForTextOverflow()
|
|
{
|
|
// Determine the width of the ellipsis using the current font.
|
|
// FIXME: CSS3 says this is configurable, also need to use 0x002E (FULL STOP) if horizontal ellipsis is "not renderable"
|
|
const Font& font = style()->font();
|
|
DEFINE_STATIC_LOCAL(AtomicString, ellipsisStr, (&horizontalEllipsis, 1));
|
|
const Font& firstLineFont = firstLineStyle()->font();
|
|
// FIXME: We should probably not hard-code the direction here. https://crbug.com/333004
|
|
TextDirection ellipsisDirection = LTR;
|
|
float firstLineEllipsisWidth = firstLineFont.width(constructTextRun(this, firstLineFont, &horizontalEllipsis, 1, firstLineStyle(), ellipsisDirection));
|
|
float ellipsisWidth = (font == firstLineFont) ? firstLineEllipsisWidth : font.width(constructTextRun(this, font, &horizontalEllipsis, 1, style(), ellipsisDirection));
|
|
|
|
// For LTR text truncation, we want to get the right edge of our padding box, and then we want to see
|
|
// if the right edge of a line box exceeds that. For RTL, we use the left edge of the padding box and
|
|
// check the left edge of the line box to see if it is less
|
|
// Include the scrollbar for overflow blocks, which means we want to use "contentWidth()"
|
|
bool ltr = style()->isLeftToRightDirection();
|
|
ETextAlign textAlign = style()->textAlign();
|
|
bool firstLine = true;
|
|
for (RootInlineBox* curr = firstRootBox(); curr; curr = curr->nextRootBox()) {
|
|
float currLogicalLeft = curr->logicalLeft();
|
|
LayoutUnit blockRightEdge = logicalRightOffsetForLine(curr->lineTop(), firstLine);
|
|
LayoutUnit blockLeftEdge = logicalLeftOffsetForLine(curr->lineTop(), firstLine);
|
|
LayoutUnit lineBoxEdge = ltr ? currLogicalLeft + curr->logicalWidth() : currLogicalLeft;
|
|
if ((ltr && lineBoxEdge > blockRightEdge) || (!ltr && lineBoxEdge < blockLeftEdge)) {
|
|
// This line spills out of our box in the appropriate direction. Now we need to see if the line
|
|
// can be truncated. In order for truncation to be possible, the line must have sufficient space to
|
|
// accommodate our truncation string, and no replaced elements (images, tables) can overlap the ellipsis
|
|
// space.
|
|
|
|
LayoutUnit width = firstLine ? firstLineEllipsisWidth : ellipsisWidth;
|
|
LayoutUnit blockEdge = ltr ? blockRightEdge : blockLeftEdge;
|
|
if (curr->lineCanAccommodateEllipsis(ltr, blockEdge, lineBoxEdge, width)) {
|
|
float totalLogicalWidth = curr->placeEllipsis(ellipsisStr, ltr, blockLeftEdge.toFloat(), blockRightEdge.toFloat(), width.toFloat());
|
|
|
|
float logicalLeft = 0; // We are only intersted in the delta from the base position.
|
|
float availableLogicalWidth = (blockRightEdge - blockLeftEdge).toFloat();
|
|
updateLogicalWidthForAlignment(textAlign, curr, 0, logicalLeft, totalLogicalWidth, availableLogicalWidth, 0);
|
|
if (ltr)
|
|
curr->adjustLogicalPosition(logicalLeft, 0);
|
|
else
|
|
curr->adjustLogicalPosition(logicalLeft - (availableLogicalWidth - totalLogicalWidth), 0);
|
|
}
|
|
}
|
|
firstLine = false;
|
|
}
|
|
}
|
|
|
|
LayoutUnit RenderBlockFlow::startAlignedOffsetForLine(LayoutUnit position, bool firstLine)
|
|
{
|
|
ETextAlign textAlign = style()->textAlign();
|
|
|
|
if (textAlign == TASTART) // FIXME: Handle TAEND here
|
|
return startOffsetForLine(position, firstLine);
|
|
|
|
// updateLogicalWidthForAlignment() handles the direction of the block so no need to consider it here
|
|
float totalLogicalWidth = 0;
|
|
float logicalLeft = logicalLeftOffsetForLine(logicalHeight(), false).toFloat();
|
|
float availableLogicalWidth = logicalRightOffsetForLine(logicalHeight(), false) - logicalLeft;
|
|
updateLogicalWidthForAlignment(textAlign, 0, 0, logicalLeft, totalLogicalWidth, availableLogicalWidth, 0);
|
|
|
|
if (!style()->isLeftToRightDirection())
|
|
return logicalWidth() - logicalLeft;
|
|
return logicalLeft;
|
|
}
|
|
|
|
}
|