448 lines
18 KiB
C++
448 lines
18 KiB
C++
/*
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* Copyright (C) 2003, 2004, 2005, 2006, 2007, 2009, 2010, 2011 Apple 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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#pragma once
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#include "HitTestRequest.h"
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#include "RenderBoxModelObject.h"
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#include "RenderText.h"
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#include "TextFlags.h"
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#include <wtf/IsoMalloc.h>
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#include <wtf/TypeCasts.h>
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#include <wtf/WeakPtr.h>
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namespace WebCore {
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class HitTestResult;
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class LegacyRootInlineBox;
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// LegacyInlineBox represents a rectangle that occurs on a line. It corresponds to
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// some RenderObject (i.e., it represents a portion of that RenderObject).
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class LegacyInlineBox {
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WTF_MAKE_ISO_ALLOCATED(LegacyInlineBox);
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public:
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virtual ~LegacyInlineBox();
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void assertNotDeleted() const;
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virtual void deleteLine() = 0;
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virtual void extractLine() = 0;
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virtual void attachLine() = 0;
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virtual bool isLineBreak() const { return renderer().isLineBreak(); }
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WEBCORE_EXPORT virtual void adjustPosition(float dx, float dy);
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void adjustLogicalPosition(float deltaLogicalLeft, float deltaLogicalTop)
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{
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if (isHorizontal())
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adjustPosition(deltaLogicalLeft, deltaLogicalTop);
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else
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adjustPosition(deltaLogicalTop, deltaLogicalLeft);
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}
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void adjustLineDirectionPosition(float delta)
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{
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if (isHorizontal())
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adjustPosition(delta, 0);
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else
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adjustPosition(0, delta);
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}
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void adjustBlockDirectionPosition(float delta)
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{
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if (isHorizontal())
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adjustPosition(0, delta);
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else
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adjustPosition(delta, 0);
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}
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virtual void paint(PaintInfo&, const LayoutPoint&, LayoutUnit lineTop, LayoutUnit lineBottom) = 0;
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virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, LayoutUnit lineTop, LayoutUnit lineBottom, HitTestAction) = 0;
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#if ENABLE(TREE_DEBUGGING)
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void showNodeTreeForThis() const;
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void showLineTreeForThis() const;
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WEBCORE_EXPORT virtual void outputLineTreeAndMark(WTF::TextStream&, const LegacyInlineBox* markedBox, int depth) const;
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WEBCORE_EXPORT virtual void outputLineBox(WTF::TextStream&, bool mark, int depth) const;
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WEBCORE_EXPORT virtual const char* boxName() const;
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#endif
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bool behavesLikeText() const { return m_bitfields.behavesLikeText(); }
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void setBehavesLikeText(bool behavesLikeText) { m_bitfields.setBehavesLikeText(behavesLikeText); }
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virtual bool isInlineElementBox() const { return false; }
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virtual bool isInlineFlowBox() const { return false; }
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virtual bool isInlineTextBox() const { return false; }
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virtual bool isRootInlineBox() const { return false; }
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virtual bool isSVGInlineTextBox() const { return false; }
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virtual bool isSVGInlineFlowBox() const { return false; }
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virtual bool isSVGRootInlineBox() const { return false; }
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bool hasVirtualLogicalHeight() const { return m_bitfields.hasVirtualLogicalHeight(); }
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void setHasVirtualLogicalHeight() { m_bitfields.setHasVirtualLogicalHeight(true); }
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virtual float virtualLogicalHeight() const
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{
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ASSERT_NOT_REACHED();
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return 0;
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}
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bool isHorizontal() const { return m_bitfields.isHorizontal(); }
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void setIsHorizontal(bool isHorizontal) { m_bitfields.setIsHorizontal(isHorizontal); }
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bool isConstructed() { return m_bitfields.constructed(); }
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virtual void setConstructed() { m_bitfields.setConstructed(true); }
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void setExtracted(bool extracted = true) { m_bitfields.setExtracted(extracted); }
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void setIsFirstLine(bool firstLine) { m_bitfields.setFirstLine(firstLine); }
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bool isFirstLine() const { return m_bitfields.firstLine(); }
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void removeFromParent();
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LegacyInlineBox* nextOnLine() const { return m_nextOnLine; }
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LegacyInlineBox* previousOnLine() const { return m_previousOnLine; }
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void setNextOnLine(LegacyInlineBox* next)
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{
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ASSERT(m_parent || !next);
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m_nextOnLine = next;
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}
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void setPreviousOnLine(LegacyInlineBox* previous)
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{
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ASSERT(m_parent || !previous);
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m_previousOnLine = previous;
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}
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bool nextOnLineExists() const;
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bool previousOnLineExists() const;
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virtual bool isLeaf() const { return true; }
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LegacyInlineBox* nextLeafOnLine() const;
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LegacyInlineBox* previousLeafOnLine() const;
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// FIXME: Hide this once all callers are using tighter types.
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RenderObject& renderer() const { return *m_renderer; }
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LegacyInlineFlowBox* parent() const
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{
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assertNotDeleted();
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ASSERT_WITH_SECURITY_IMPLICATION(!m_hasBadParent);
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return m_parent;
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}
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void setParent(LegacyInlineFlowBox* par) { m_parent = par; }
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const LegacyRootInlineBox& root() const;
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LegacyRootInlineBox& root();
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// x() is the left side of the box in the containing block's coordinate system.
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void setX(float x) { m_topLeft.setX(x); }
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float x() const { return m_topLeft.x(); }
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float left() const { return m_topLeft.x(); }
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// y() is the top side of the box in the containing block's coordinate system.
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void setY(float y) { m_topLeft.setY(y); }
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float y() const { return m_topLeft.y(); }
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float top() const { return m_topLeft.y(); }
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const FloatPoint& topLeft() const { return m_topLeft; }
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float width() const { return isHorizontal() ? logicalWidth() : logicalHeight(); }
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float height() const { return isHorizontal() ? logicalHeight() : logicalWidth(); }
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FloatSize size() const { return FloatSize(width(), height()); }
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float right() const { return left() + width(); }
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float bottom() const { return top() + height(); }
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// The logicalLeft position is the left edge of the line box in a horizontal line and the top edge in a vertical line.
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float logicalLeft() const { return isHorizontal() ? m_topLeft.x() : m_topLeft.y(); }
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float logicalRight() const { return logicalLeft() + logicalWidth(); }
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void setLogicalLeft(float left)
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{
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if (isHorizontal())
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setX(left);
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else
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setY(left);
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}
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// The logicalTop[ position is the top edge of the line box in a horizontal line and the left edge in a vertical line.
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float logicalTop() const { return isHorizontal() ? m_topLeft.y() : m_topLeft.x(); }
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float logicalBottom() const { return logicalTop() + logicalHeight(); }
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void setLogicalTop(float top)
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{
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if (isHorizontal())
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setY(top);
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else
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setX(top);
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}
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// The logical width is our extent in the line's overall inline direction, i.e., width for horizontal text and height for vertical text.
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void setLogicalWidth(float w) { m_logicalWidth = w; }
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float logicalWidth() const { return m_logicalWidth; }
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// The logical height is our extent in the block flow direction, i.e., height for horizontal text and width for vertical text.
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float logicalHeight() const;
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FloatRect logicalFrameRect() const { return isHorizontal() ? FloatRect(m_topLeft.x(), m_topLeft.y(), m_logicalWidth, logicalHeight()) : FloatRect(m_topLeft.y(), m_topLeft.x(), m_logicalWidth, logicalHeight()); }
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FloatRect frameRect() const { return FloatRect(topLeft(), size()); }
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WEBCORE_EXPORT virtual LayoutUnit baselinePosition(FontBaseline baselineType) const;
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WEBCORE_EXPORT virtual LayoutUnit lineHeight() const;
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WEBCORE_EXPORT virtual int caretMinOffset() const;
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WEBCORE_EXPORT virtual int caretMaxOffset() const;
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unsigned char bidiLevel() const { return m_bitfields.bidiEmbeddingLevel(); }
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void setBidiLevel(unsigned char level) { m_bitfields.setBidiEmbeddingLevel(level); }
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TextDirection direction() const { return bidiLevel() % 2 ? TextDirection::RTL : TextDirection::LTR; }
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bool isLeftToRightDirection() const { return direction() == TextDirection::LTR; }
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int caretLeftmostOffset() const { return isLeftToRightDirection() ? caretMinOffset() : caretMaxOffset(); }
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int caretRightmostOffset() const { return isLeftToRightDirection() ? caretMaxOffset() : caretMinOffset(); }
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virtual void clearTruncation() { }
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bool isDirty() const { return m_bitfields.dirty(); }
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virtual void markDirty(bool dirty = true) { m_bitfields.setDirty(dirty); }
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WEBCORE_EXPORT virtual void dirtyLineBoxes();
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WEBCORE_EXPORT virtual RenderObject::HighlightState selectionState();
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WEBCORE_EXPORT virtual bool canAccommodateEllipsis(bool ltr, int blockEdge, int ellipsisWidth) const;
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// visibleLeftEdge, visibleRightEdge are in the parent's coordinate system.
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WEBCORE_EXPORT virtual float placeEllipsisBox(bool ltr, float visibleLeftEdge, float visibleRightEdge, float ellipsisWidth, float &truncatedWidth, bool&);
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#if !ASSERT_WITH_SECURITY_IMPLICATION_DISABLED
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void setHasBadParent();
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void invalidateParentChildList();
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#endif
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bool visibleToHitTesting(std::optional<HitTestRequest> hitTestRequest = std::nullopt) const
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{
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if (renderer().style().visibility() != Visibility::Visible)
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return false;
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if ((!hitTestRequest || !hitTestRequest->ignoreCSSPointerEventsProperty()) && renderer().style().pointerEvents() == PointerEvents::None)
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return false;
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return true;
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}
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const RenderStyle& lineStyle() const { return m_bitfields.firstLine() ? renderer().firstLineStyle() : renderer().style(); }
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VerticalAlign verticalAlign() const { return lineStyle().verticalAlign(); }
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// Use with caution! The type is not checked!
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RenderBoxModelObject* boxModelObject() const
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{
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if (!is<RenderText>(renderer()))
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return &downcast<RenderBoxModelObject>(renderer());
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return nullptr;
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}
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FloatPoint locationIncludingFlipping() const;
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void flipForWritingMode(FloatRect&) const;
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FloatPoint flipForWritingMode(const FloatPoint&) const;
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void flipForWritingMode(LayoutRect&) const;
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LayoutPoint flipForWritingMode(const LayoutPoint&) const;
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bool knownToHaveNoOverflow() const { return m_bitfields.knownToHaveNoOverflow(); }
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void clearKnownToHaveNoOverflow();
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bool dirOverride() const { return m_bitfields.dirOverride(); }
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void setDirOverride(bool dirOverride) { m_bitfields.setDirOverride(dirOverride); }
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void setExpansion(float newExpansion)
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{
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m_logicalWidth -= m_expansion;
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m_expansion = newExpansion;
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m_logicalWidth += m_expansion;
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}
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void setExpansionWithoutGrowing(float newExpansion)
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{
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ASSERT(!m_expansion);
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m_expansion = newExpansion;
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}
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float expansion() const { return m_expansion; }
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void setHasHyphen(bool hasHyphen) { m_bitfields.setHasEllipsisBoxOrHyphen(hasHyphen); }
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void setCanHaveLeftExpansion(bool canHaveLeftExpansion) { m_bitfields.setCanHaveLeftExpansion(canHaveLeftExpansion); }
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void setCanHaveRightExpansion(bool canHaveRightExpansion) { m_bitfields.setCanHaveRightExpansion(canHaveRightExpansion); }
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void setForceRightExpansion() { m_bitfields.setForceRightExpansion(true); }
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void setForceLeftExpansion() { m_bitfields.setForceLeftExpansion(true); }
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private:
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LegacyInlineBox* m_nextOnLine { nullptr }; // The next element on the same line as us.
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LegacyInlineBox* m_previousOnLine { nullptr }; // The previous element on the same line as us.
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LegacyInlineFlowBox* m_parent { nullptr }; // The box that contains us.
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WeakPtr<RenderObject> m_renderer;
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private:
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float m_logicalWidth { 0 };
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float m_expansion { 0 };
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FloatPoint m_topLeft;
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#define ADD_BOOLEAN_BITFIELD(name, Name) \
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private:\
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unsigned m_##name : 1;\
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public:\
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bool name() const { return m_##name; }\
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void set##Name(bool name) { m_##name = name; }\
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class InlineBoxBitfields {
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public:
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explicit InlineBoxBitfields(bool firstLine = false, bool constructed = false, bool dirty = false, bool extracted = false, bool isHorizontal = true)
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: m_firstLine(firstLine)
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, m_constructed(constructed)
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, m_bidiEmbeddingLevel(0)
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, m_dirty(dirty)
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, m_extracted(extracted)
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, m_hasVirtualLogicalHeight(false)
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, m_isHorizontal(isHorizontal)
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, m_endsWithBreak(false)
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, m_canHaveLeftExpansion(false)
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, m_canHaveRightExpansion(false)
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, m_knownToHaveNoOverflow(true)
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, m_hasEllipsisBoxOrHyphen(false)
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, m_dirOverride(false)
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, m_behavesLikeText(false)
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, m_forceRightExpansion(false)
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, m_forceLeftExpansion(false)
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, m_determinedIfNextOnLineExists(false)
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, m_nextOnLineExists(false)
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{
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}
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// Some of these bits are actually for subclasses and moved here to compact the structures.
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// for this class
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ADD_BOOLEAN_BITFIELD(firstLine, FirstLine);
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ADD_BOOLEAN_BITFIELD(constructed, Constructed);
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private:
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unsigned m_bidiEmbeddingLevel : 6; // The maximium bidi level is 62: http://unicode.org/reports/tr9/#Explicit_Levels_and_Directions
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public:
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unsigned char bidiEmbeddingLevel() const { return m_bidiEmbeddingLevel; }
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void setBidiEmbeddingLevel(unsigned char bidiEmbeddingLevel) { m_bidiEmbeddingLevel = bidiEmbeddingLevel; }
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ADD_BOOLEAN_BITFIELD(dirty, Dirty);
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ADD_BOOLEAN_BITFIELD(extracted, Extracted);
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ADD_BOOLEAN_BITFIELD(hasVirtualLogicalHeight, HasVirtualLogicalHeight);
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ADD_BOOLEAN_BITFIELD(isHorizontal, IsHorizontal);
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// for RootInlineBox
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ADD_BOOLEAN_BITFIELD(endsWithBreak, EndsWithBreak); // Whether the line ends with a <br>.
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// shared between RootInlineBox and LegacyInlineTextBox
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ADD_BOOLEAN_BITFIELD(canHaveLeftExpansion, CanHaveLeftExpansion);
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ADD_BOOLEAN_BITFIELD(canHaveRightExpansion, CanHaveRightExpansion);
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ADD_BOOLEAN_BITFIELD(knownToHaveNoOverflow, KnownToHaveNoOverflow);
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ADD_BOOLEAN_BITFIELD(hasEllipsisBoxOrHyphen, HasEllipsisBoxOrHyphen);
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// for LegacyInlineTextBox
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ADD_BOOLEAN_BITFIELD(dirOverride, DirOverride);
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ADD_BOOLEAN_BITFIELD(behavesLikeText, BehavesLikeText); // Whether or not this object represents text with a non-zero height. Includes non-image list markers, text boxes, br.
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ADD_BOOLEAN_BITFIELD(forceRightExpansion, ForceRightExpansion);
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ADD_BOOLEAN_BITFIELD(forceLeftExpansion, ForceLeftExpansion);
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private:
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mutable unsigned m_determinedIfNextOnLineExists : 1;
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public:
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bool determinedIfNextOnLineExists() const { return m_determinedIfNextOnLineExists; }
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void setDeterminedIfNextOnLineExists(bool determinedIfNextOnLineExists) const { m_determinedIfNextOnLineExists = determinedIfNextOnLineExists; }
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private:
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mutable unsigned m_nextOnLineExists : 1;
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public:
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bool nextOnLineExists() const { return m_nextOnLineExists; }
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void setNextOnLineExists(bool nextOnLineExists) const { m_nextOnLineExists = nextOnLineExists; }
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};
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#undef ADD_BOOLEAN_BITFIELD
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InlineBoxBitfields m_bitfields;
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protected:
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explicit LegacyInlineBox(RenderObject& renderer)
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: m_renderer(makeWeakPtr(renderer))
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{
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}
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LegacyInlineBox(RenderObject& renderer, FloatPoint topLeft, float logicalWidth, bool firstLine, bool constructed, bool dirty, bool extracted, bool isHorizontal, LegacyInlineBox* next, LegacyInlineBox* previous, LegacyInlineFlowBox* parent)
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: m_nextOnLine(next)
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, m_previousOnLine(previous)
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, m_parent(parent)
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, m_renderer(makeWeakPtr(renderer))
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, m_logicalWidth(logicalWidth)
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, m_topLeft(topLeft)
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, m_bitfields(firstLine, constructed, dirty, extracted, isHorizontal)
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{
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}
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// For RootInlineBox
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bool endsWithBreak() const { return m_bitfields.endsWithBreak(); }
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void setEndsWithBreak(bool endsWithBreak) { m_bitfields.setEndsWithBreak(endsWithBreak); }
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bool hasEllipsisBox() const { return m_bitfields.hasEllipsisBoxOrHyphen(); }
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void setHasEllipsisBox(bool hasEllipsisBox) { m_bitfields.setHasEllipsisBoxOrHyphen(hasEllipsisBox); }
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// For LegacyInlineTextBox
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bool hasHyphen() const { return m_bitfields.hasEllipsisBoxOrHyphen(); }
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bool canHaveLeftExpansion() const { return m_bitfields.canHaveLeftExpansion(); }
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bool canHaveRightExpansion() const { return m_bitfields.canHaveRightExpansion(); }
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bool forceRightExpansion() const { return m_bitfields.forceRightExpansion(); }
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bool forceLeftExpansion() const { return m_bitfields.forceLeftExpansion(); }
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// For LegacyInlineFlowBox and LegacyInlineTextBox
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bool extracted() const { return m_bitfields.extracted(); }
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protected:
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#if !ASSERT_WITH_SECURITY_IMPLICATION_DISABLED
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private:
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static constexpr unsigned deletionSentinelNotDeletedValue = 0xF0F0F0F0U;
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static constexpr unsigned deletionSentinelDeletedValue = 0xF0DEADF0U;
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unsigned m_deletionSentinel { deletionSentinelNotDeletedValue };
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bool m_hasBadParent { false };
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protected:
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bool m_isEverInChildList { true };
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#endif
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};
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#if ASSERT_WITH_SECURITY_IMPLICATION_DISABLED
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inline LegacyInlineBox::~LegacyInlineBox()
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{
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}
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inline void LegacyInlineBox::assertNotDeleted() const
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{
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}
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#endif
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} // namespace WebCore
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#define SPECIALIZE_TYPE_TRAITS_INLINE_BOX(ToValueTypeName, predicate) \
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SPECIALIZE_TYPE_TRAITS_BEGIN(WebCore::ToValueTypeName) \
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static bool isType(const WebCore::LegacyInlineBox& box) { return box.predicate; } \
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SPECIALIZE_TYPE_TRAITS_END()
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#if ENABLE(TREE_DEBUGGING)
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// Outside the WebCore namespace for ease of invocation from the debugger.
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void showNodeTree(const WebCore::LegacyInlineBox*);
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void showLineTree(const WebCore::LegacyInlineBox*);
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#endif
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