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/*
* (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 2000 Dirk Mueller (mueller@kde.org)
* Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#ifndef RenderText_h
#define RenderText_h
#include "core/rendering/RenderObject.h"
#include "wtf/Forward.h"
#include "wtf/PassRefPtr.h"
namespace WebCore {
class AbstractInlineTextBox;
class InlineTextBox;
class RenderText : public RenderObject {
public:
// FIXME: If the node argument is not a Text node or the string argument is
// not the content of the Text node, updating text-transform property
// doesn't re-transform the string.
RenderText(Node*, PassRefPtr<StringImpl>);
#ifndef NDEBUG
virtual ~RenderText();
#endif
virtual const char* renderName() const;
virtual bool isTextFragment() const;
virtual bool isWordBreak() const;
virtual PassRefPtr<StringImpl> originalText() const;
void extractTextBox(InlineTextBox*);
void attachTextBox(InlineTextBox*);
void removeTextBox(InlineTextBox*);
const String& text() const { return m_text; }
String textWithoutTranscoding() const;
virtual unsigned textStartOffset() const { return 0; }
InlineTextBox* createInlineTextBox();
void dirtyLineBoxes(bool fullLayout);
virtual void absoluteRects(Vector<IntRect>&, const LayoutPoint& accumulatedOffset) const OVERRIDE FINAL;
void absoluteRectsForRange(Vector<IntRect>&, unsigned startOffset = 0, unsigned endOffset = INT_MAX, bool useSelectionHeight = false, bool* wasFixed = 0);
virtual void absoluteQuads(Vector<FloatQuad>&, bool* wasFixed) const OVERRIDE FINAL;
void absoluteQuadsForRange(Vector<FloatQuad>&, unsigned startOffset = 0, unsigned endOffset = INT_MAX, bool useSelectionHeight = false, bool* wasFixed = 0);
enum ClippingOption { NoClipping, ClipToEllipsis };
void absoluteQuads(Vector<FloatQuad>&, bool* wasFixed = 0, ClippingOption = NoClipping) const;
virtual PositionWithAffinity positionForPoint(const LayoutPoint&) OVERRIDE;
bool is8Bit() const { return m_text.is8Bit(); }
const LChar* characters8() const { return m_text.impl()->characters8(); }
const UChar* characters16() const { return m_text.impl()->characters16(); }
bool hasEmptyText() const { return m_text.isEmpty(); }
String substring(unsigned position, unsigned length) const { return m_text.substring(position, length); }
UChar characterAt(unsigned) const;
UChar uncheckedCharacterAt(unsigned) const;
UChar operator[](unsigned i) const { return uncheckedCharacterAt(i); }
unsigned textLength() const { return m_text.length(); } // non virtual implementation of length()
void positionLineBox(InlineBox*);
virtual float width(unsigned from, unsigned len, const Font&, float xPos, HashSet<const SimpleFontData*>* fallbackFonts = 0, GlyphOverflow* = 0) const;
virtual float width(unsigned from, unsigned len, float xPos, bool firstLine = false, HashSet<const SimpleFontData*>* fallbackFonts = 0, GlyphOverflow* = 0) const;
float minLogicalWidth() const;
float maxLogicalWidth() const;
void trimmedPrefWidths(float leadWidth,
float& firstLineMinWidth, bool& hasBreakableStart,
float& lastLineMinWidth, bool& hasBreakableEnd,
bool& hasBreakableChar, bool& hasBreak,
float& firstLineMaxWidth, float& lastLineMaxWidth,
float& minWidth, float& maxWidth, bool& stripFrontSpaces);
virtual IntRect linesBoundingBox() const;
LayoutRect linesVisualOverflowBoundingBox() const;
FloatPoint firstRunOrigin() const;
float firstRunX() const;
float firstRunY() const;
virtual void setText(PassRefPtr<StringImpl>, bool force = false);
void setTextWithOffset(PassRefPtr<StringImpl>, unsigned offset, unsigned len, bool force = false);
virtual void transformText();
virtual bool canBeSelectionLeaf() const { return true; }
virtual void setSelectionState(SelectionState s) OVERRIDE FINAL;
virtual LayoutRect selectionRectForRepaint(const RenderLayerModelObject* repaintContainer, bool clipToVisibleContent = true) OVERRIDE;
virtual LayoutRect localCaretRect(InlineBox*, int caretOffset, LayoutUnit* extraWidthToEndOfLine = 0);
LayoutUnit marginLeft() const { return minimumValueForLength(style()->marginLeft(), 0, view()); }
LayoutUnit marginRight() const { return minimumValueForLength(style()->marginRight(), 0, view()); }
virtual LayoutRect clippedOverflowRectForRepaint(const RenderLayerModelObject* repaintContainer) const OVERRIDE FINAL;
InlineTextBox* firstTextBox() const { return m_firstTextBox; }
InlineTextBox* lastTextBox() const { return m_lastTextBox; }
virtual int caretMinOffset() const;
virtual int caretMaxOffset() const;
unsigned renderedTextLength() const;
virtual int previousOffset(int current) const OVERRIDE FINAL;
virtual int previousOffsetForBackwardDeletion(int current) const OVERRIDE FINAL;
virtual int nextOffset(int current) const OVERRIDE FINAL;
bool containsReversedText() const { return m_containsReversedText; }
bool isSecure() const { return style()->textSecurity() != TSNONE; }
void momentarilyRevealLastTypedCharacter(unsigned lastTypedCharacterOffset);
InlineTextBox* findNextInlineTextBox(int offset, int& pos) const;
void checkConsistency() const;
bool isAllCollapsibleWhitespace() const;
bool canUseSimpleFontCodePath() const { return m_canUseSimpleFontCodePath; }
bool knownToHaveNoOverflowAndNoFallbackFonts() const { return m_knownToHaveNoOverflowAndNoFallbackFonts; }
void removeAndDestroyTextBoxes();
PassRefPtr<AbstractInlineTextBox> firstAbstractInlineTextBox();
protected:
virtual void computePreferredLogicalWidths(float leadWidth);
virtual void willBeDestroyed();
virtual void styleWillChange(StyleDifference, const RenderStyle*) OVERRIDE FINAL { }
virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle);
virtual void setTextInternal(PassRefPtr<StringImpl>);
virtual UChar previousCharacter() const;
virtual void addLayerHitTestRects(LayerHitTestRects&, const RenderLayer* currentLayer, const LayoutPoint& layerOffset, const LayoutRect& containerRect) const OVERRIDE;
virtual InlineTextBox* createTextBox(); // Subclassed by SVG.
private:
void computePreferredLogicalWidths(float leadWidth, HashSet<const SimpleFontData*>& fallbackFonts, GlyphOverflow&);
bool computeCanUseSimpleFontCodePath() const;
// Make length() private so that callers that have a RenderText*
// will use the more efficient textLength() instead, while
// callers with a RenderObject* can continue to use length().
virtual unsigned length() const OVERRIDE FINAL { return textLength(); }
virtual void paint(PaintInfo&, const LayoutPoint&) OVERRIDE FINAL { ASSERT_NOT_REACHED(); }
virtual void layout() OVERRIDE FINAL { ASSERT_NOT_REACHED(); }
virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation&, const LayoutPoint&, HitTestAction) OVERRIDE FINAL { ASSERT_NOT_REACHED(); return false; }
void deleteTextBoxes();
bool containsOnlyWhitespace(unsigned from, unsigned len) const;
float widthFromCache(const Font&, int start, int len, float xPos, HashSet<const SimpleFontData*>* fallbackFonts, GlyphOverflow*) const;
bool isAllASCII() const { return m_isAllASCII; }
void updateNeedsTranscoding();
void secureText(UChar mask);
// We put the bitfield first to minimize padding on 64-bit.
bool m_hasBreakableChar : 1; // Whether or not we can be broken into multiple lines.
bool m_hasBreak : 1; // Whether or not we have a hard break (e.g., <pre> with '\n').
bool m_hasTab : 1; // Whether or not we have a variable width tab character (e.g., <pre> with '\t').
bool m_hasBreakableStart : 1;
bool m_hasBreakableEnd : 1;
bool m_hasEndWhiteSpace : 1;
bool m_linesDirty : 1; // This bit indicates that the text run has already dirtied specific
// line boxes, and this hint will enable layoutInlineChildren to avoid
// just dirtying everything when character data is modified (e.g., appended/inserted
// or removed).
bool m_containsReversedText : 1;
bool m_isAllASCII : 1;
bool m_canUseSimpleFontCodePath : 1;
mutable bool m_knownToHaveNoOverflowAndNoFallbackFonts : 1;
bool m_needsTranscoding : 1;
float m_minWidth;
float m_maxWidth;
float m_firstLineMinWidth;
float m_lastLineLineMinWidth;
String m_text;
InlineTextBox* m_firstTextBox;
InlineTextBox* m_lastTextBox;
};
inline UChar RenderText::uncheckedCharacterAt(unsigned i) const
{
ASSERT_WITH_SECURITY_IMPLICATION(i < textLength());
return is8Bit() ? characters8()[i] : characters16()[i];
}
inline UChar RenderText::characterAt(unsigned i) const
{
if (i >= textLength())
return 0;
return uncheckedCharacterAt(i);
}
DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderText, isText());
#ifdef NDEBUG
inline void RenderText::checkConsistency() const
{
}
#endif
void applyTextTransform(const RenderStyle*, String&, UChar);
} // namespace WebCore
#endif // RenderText_h