141 lines
6.5 KiB
C++
141 lines
6.5 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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* Copyright (C) 2013 ChangSeok Oh <shivamidow@gmail.com>
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* Copyright (C) 2013 Adobe Systems Inc. All right 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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#pragma once
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#include "LineInfo.h"
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#include "RenderLayer.h"
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namespace WebCore {
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enum WhitespacePosition { LeadingWhitespace, TrailingWhitespace };
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inline bool hasInlineDirectionBordersPaddingOrMargin(const RenderInline& flow)
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{
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// Where an empty inline is split across anonymous blocks we should only give lineboxes to the 'sides' of the
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// inline that have borders, padding or margin.
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bool shouldApplyStartBorderPaddingOrMargin = !flow.parent()->isAnonymousBlock() || !flow.isContinuation();
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if (shouldApplyStartBorderPaddingOrMargin && (flow.borderStart() || flow.marginStart() || flow.paddingStart()))
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return true;
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bool shouldApplyEndBorderPaddingOrMargin = !flow.parent()->isAnonymousBlock() || flow.isContinuation() || !flow.inlineContinuation();
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return shouldApplyEndBorderPaddingOrMargin && (flow.borderEnd() || flow.marginEnd() || flow.paddingEnd());
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}
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inline const RenderStyle& lineStyle(const RenderObject& renderer, const LineInfo& lineInfo)
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{
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return lineInfo.isFirstLine() ? renderer.firstLineStyle() : renderer.style();
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}
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inline bool requiresLineBoxForContent(const RenderInline& flow, const LineInfo& lineInfo)
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{
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RenderElement* parent = flow.parent();
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if (flow.document().inNoQuirksMode()) {
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const RenderStyle& flowStyle = lineStyle(flow, lineInfo);
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const RenderStyle& parentStyle = lineStyle(*parent, lineInfo);
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if (flowStyle.lineHeight() != parentStyle.lineHeight()
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|| flowStyle.verticalAlign() != parentStyle.verticalAlign()
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|| !parentStyle.fontCascade().fontMetrics().hasIdenticalAscentDescentAndLineGap(flowStyle.fontCascade().fontMetrics()))
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return true;
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}
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return false;
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}
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inline bool shouldCollapseWhiteSpace(const RenderStyle* style, const LineInfo& lineInfo, WhitespacePosition whitespacePosition)
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{
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// CSS2 16.6.1
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// If a space (U+0020) at the beginning of a line has 'white-space' set to 'normal', 'nowrap', or 'pre-line', it is removed.
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// If a space (U+0020) at the end of a line has 'white-space' set to 'normal', 'nowrap', or 'pre-line', it is also removed.
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// If spaces (U+0020) or tabs (U+0009) at the end of a line have 'white-space' set to 'pre-wrap', UAs may visually collapse them.
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return style->collapseWhiteSpace()
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|| (whitespacePosition == TrailingWhitespace && style->whiteSpace() == WhiteSpace::PreWrap && (!lineInfo.isEmpty() || !lineInfo.previousLineBrokeCleanly()));
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}
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inline bool skipNonBreakingSpace(const InlineIterator& it, const LineInfo& lineInfo)
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{
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if (it.renderer()->style().nbspMode() != NBSPMode::Space || it.current() != noBreakSpace)
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return false;
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// FIXME: This is bad. It makes nbsp inconsistent with space and won't work correctly
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// with m_minWidth/m_maxWidth.
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// Do not skip a non-breaking space if it is the first character
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// on a line after a clean line break (or on the first line, since previousLineBrokeCleanly starts off
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// |true|).
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if (lineInfo.isEmpty() && lineInfo.previousLineBrokeCleanly())
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return false;
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return true;
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}
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inline bool alwaysRequiresLineBox(const RenderInline& flow)
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{
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// FIXME: Right now, we only allow line boxes for inlines that are truly empty.
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// We need to fix this, though, because at the very least, inlines containing only
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// ignorable whitespace should should also have line boxes.
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return isEmptyInline(flow) && hasInlineDirectionBordersPaddingOrMargin(flow);
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}
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inline bool requiresLineBox(const InlineIterator& it, const LineInfo& lineInfo = LineInfo(), WhitespacePosition whitespacePosition = LeadingWhitespace)
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{
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if (it.renderer()->isFloatingOrOutOfFlowPositioned())
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return false;
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if (it.renderer()->isBR())
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return true;
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bool rendererIsEmptyInline = false;
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if (is<RenderInline>(*it.renderer())) {
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const auto& inlineRenderer = downcast<RenderInline>(*it.renderer());
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if (!alwaysRequiresLineBox(inlineRenderer) && !requiresLineBoxForContent(inlineRenderer, lineInfo))
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return false;
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rendererIsEmptyInline = isEmptyInline(inlineRenderer);
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}
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if (!shouldCollapseWhiteSpace(&it.renderer()->style(), lineInfo, whitespacePosition))
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return true;
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UChar current = it.current();
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bool notJustWhitespace = current != ' ' && current != '\t' && current != softHyphen && (current != '\n' || it.renderer()->preservesNewline()) && !skipNonBreakingSpace(it, lineInfo);
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return notJustWhitespace || rendererIsEmptyInline;
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}
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inline void setStaticPositions(RenderBlockFlow& block, RenderBox& child, IndentTextOrNot shouldIndentText)
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{
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// FIXME: The math here is actually not really right. It's a best-guess approximation that
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// will work for the common cases
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RenderElement* containerBlock = child.container();
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LayoutUnit blockHeight = block.logicalHeight();
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if (is<RenderInline>(*containerBlock)) {
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// A relative positioned inline encloses us. In this case, we also have to determine our
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// position as though we were an inline. Set |staticInlinePosition| and |staticBlockPosition| on the relative positioned
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// inline so that we can obtain the value later.
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downcast<RenderInline>(*containerBlock).layer()->setStaticInlinePosition(block.startAlignedOffsetForLine(blockHeight, DoNotIndentText));
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downcast<RenderInline>(*containerBlock).layer()->setStaticBlockPosition(blockHeight);
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}
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block.updateStaticInlinePositionForChild(child, blockHeight, shouldIndentText);
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child.layer()->setStaticBlockPosition(blockHeight);
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}
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} // namespace WebCore
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