1/* 2 * (C) 1999 Lars Knoll (knoll@kde.org) 3 * (C) 2000 Dirk Mueller (mueller@kde.org) 4 * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved. 5 * 6 * This library is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Library General Public 8 * License as published by the Free Software Foundation; either 9 * version 2 of the License, or (at your option) any later version. 10 * 11 * This library is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Library General Public License for more details. 15 * 16 * You should have received a copy of the GNU Library General Public License 17 * along with this library; see the file COPYING.LIB. If not, write to 18 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 19 * Boston, MA 02110-1301, USA. 20 * 21 */ 22 23#ifndef RenderText_h 24#define RenderText_h 25 26#include "RenderObject.h" 27#include "RenderView.h" 28#include <wtf/Forward.h> 29 30namespace WebCore { 31 32class InlineTextBox; 33 34class RenderText : public RenderObject { 35public: 36 RenderText(Node*, PassRefPtr<StringImpl>); 37#ifndef NDEBUG 38 virtual ~RenderText(); 39#endif 40 41 virtual const char* renderName() const; 42 43 virtual bool isTextFragment() const; 44 virtual bool isWordBreak() const; 45 46 virtual PassRefPtr<StringImpl> originalText() const; 47 48 void extractTextBox(InlineTextBox*); 49 void attachTextBox(InlineTextBox*); 50 void removeTextBox(InlineTextBox*); 51 52 StringImpl* text() const { return m_text.impl(); } 53 String textWithoutTranscoding() const; 54 55 InlineTextBox* createInlineTextBox(); 56 void dirtyLineBoxes(bool fullLayout); 57 58 virtual void absoluteRects(Vector<IntRect>&, const LayoutPoint& accumulatedOffset) const; 59 void absoluteRectsForRange(Vector<IntRect>&, unsigned startOffset = 0, unsigned endOffset = UINT_MAX, bool useSelectionHeight = false, bool* wasFixed = 0); 60 61 virtual void absoluteQuads(Vector<FloatQuad>&, bool* wasFixed) const; 62 void absoluteQuadsForRange(Vector<FloatQuad>&, unsigned startOffset = 0, unsigned endOffset = UINT_MAX, bool useSelectionHeight = false, bool* wasFixed = 0); 63 64 enum ClippingOption { NoClipping, ClipToEllipsis }; 65 void absoluteQuads(Vector<FloatQuad>&, bool* wasFixed = 0, ClippingOption = NoClipping) const; 66 67 virtual VisiblePosition positionForPoint(const LayoutPoint&); 68 69 bool is8Bit() const { return m_text.is8Bit(); } 70 const LChar* characters8() const { return m_text.impl()->characters8(); } 71 const UChar* characters16() const { return m_text.impl()->characters16(); } 72 const UChar* characters() const { return m_text.characters(); } 73 UChar characterAt(unsigned) const; 74 UChar uncheckedCharacterAt(unsigned) const; 75 UChar operator[](unsigned i) const { return uncheckedCharacterAt(i); } 76 unsigned textLength() const { return m_text.length(); } // non virtual implementation of length() 77 void positionLineBox(InlineBox*); 78 79 virtual float width(unsigned from, unsigned len, const Font&, float xPos, HashSet<const SimpleFontData*>* fallbackFonts = 0, GlyphOverflow* = 0) const; 80 virtual float width(unsigned from, unsigned len, float xPos, bool firstLine = false, HashSet<const SimpleFontData*>* fallbackFonts = 0, GlyphOverflow* = 0) const; 81 82 float minLogicalWidth() const; 83 float maxLogicalWidth() const; 84 85 void trimmedPrefWidths(float leadWidth, 86 float& beginMinW, bool& beginWS, 87 float& endMinW, bool& endWS, 88 bool& hasBreakableChar, bool& hasBreak, 89 float& beginMaxW, float& endMaxW, 90 float& minW, float& maxW, bool& stripFrontSpaces); 91 92 virtual IntRect linesBoundingBox() const; 93 LayoutRect linesVisualOverflowBoundingBox() const; 94 95 FloatPoint firstRunOrigin() const; 96 float firstRunX() const; 97 float firstRunY() const; 98 99 virtual void setText(PassRefPtr<StringImpl>, bool force = false); 100 void setTextWithOffset(PassRefPtr<StringImpl>, unsigned offset, unsigned len, bool force = false); 101 102 virtual void transformText(); 103 104 virtual bool canBeSelectionLeaf() const { return true; } 105 virtual void setSelectionState(SelectionState s); 106 virtual LayoutRect selectionRectForRepaint(const RenderLayerModelObject* repaintContainer, bool clipToVisibleContent = true) OVERRIDE; 107 virtual LayoutRect localCaretRect(InlineBox*, int caretOffset, LayoutUnit* extraWidthToEndOfLine = 0); 108 109 virtual LayoutUnit marginLeft() const { return minimumValueForLength(style()->marginLeft(), 0, view()); } 110 virtual LayoutUnit marginRight() const { return minimumValueForLength(style()->marginRight(), 0, view()); } 111 112 virtual LayoutRect clippedOverflowRectForRepaint(const RenderLayerModelObject* repaintContainer) const OVERRIDE; 113 114 InlineTextBox* firstTextBox() const { return m_firstTextBox; } 115 InlineTextBox* lastTextBox() const { return m_lastTextBox; } 116 117 virtual int caretMinOffset() const; 118 virtual int caretMaxOffset() const; 119 virtual unsigned renderedTextLength() const; 120 121 virtual int previousOffset(int current) const; 122 virtual int previousOffsetForBackwardDeletion(int current) const; 123 virtual int nextOffset(int current) const; 124 125 bool containsReversedText() const { return m_containsReversedText; } 126 127 bool isSecure() const { return style()->textSecurity() != TSNONE; } 128 void momentarilyRevealLastTypedCharacter(unsigned lastTypedCharacterOffset); 129 130 InlineTextBox* findNextInlineTextBox(int offset, int& pos) const; 131 132 void checkConsistency() const; 133 134 bool isAllCollapsibleWhitespace() const; 135 136 bool canUseSimpleFontCodePath() const { return m_canUseSimpleFontCodePath; } 137 bool knownToHaveNoOverflowAndNoFallbackFonts() const { return m_knownToHaveNoOverflowAndNoFallbackFonts; } 138 139 void removeAndDestroyTextBoxes(); 140 141protected: 142 virtual void computePreferredLogicalWidths(float leadWidth); 143 virtual void willBeDestroyed(); 144 145 virtual void styleWillChange(StyleDifference, const RenderStyle*) { } 146 virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle); 147 148 virtual void setTextInternal(PassRefPtr<StringImpl>); 149 virtual UChar previousCharacter() const; 150 151 virtual InlineTextBox* createTextBox(); // Subclassed by SVG. 152 153private: 154 void computePreferredLogicalWidths(float leadWidth, HashSet<const SimpleFontData*>& fallbackFonts, GlyphOverflow&); 155 156 bool computeCanUseSimpleFontCodePath() const; 157 158 // Make length() private so that callers that have a RenderText* 159 // will use the more efficient textLength() instead, while 160 // callers with a RenderObject* can continue to use length(). 161 virtual unsigned length() const { return textLength(); } 162 163 virtual void paint(PaintInfo&, const LayoutPoint&) { ASSERT_NOT_REACHED(); } 164 virtual void layout() { ASSERT_NOT_REACHED(); } 165 virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation&, const LayoutPoint&, HitTestAction) OVERRIDE { ASSERT_NOT_REACHED(); return false; } 166 167 void deleteTextBoxes(); 168 bool containsOnlyWhitespace(unsigned from, unsigned len) const; 169 float widthFromCache(const Font&, int start, int len, float xPos, HashSet<const SimpleFontData*>* fallbackFonts, GlyphOverflow*) const; 170 bool isAllASCII() const { return m_isAllASCII; } 171 void updateNeedsTranscoding(); 172 173 void secureText(UChar mask); 174 175 // We put the bitfield first to minimize padding on 64-bit. 176 bool m_hasBreakableChar : 1; // Whether or not we can be broken into multiple lines. 177 bool m_hasBreak : 1; // Whether or not we have a hard break (e.g., <pre> with '\n'). 178 bool m_hasTab : 1; // Whether or not we have a variable width tab character (e.g., <pre> with '\t'). 179 bool m_hasBeginWS : 1; // Whether or not we begin with WS (only true if we aren't pre) 180 bool m_hasEndWS : 1; // Whether or not we end with WS (only true if we aren't pre) 181 bool m_linesDirty : 1; // This bit indicates that the text run has already dirtied specific 182 // line boxes, and this hint will enable layoutInlineChildren to avoid 183 // just dirtying everything when character data is modified (e.g., appended/inserted 184 // or removed). 185 bool m_containsReversedText : 1; 186 bool m_isAllASCII : 1; 187 bool m_canUseSimpleFontCodePath : 1; 188 mutable bool m_knownToHaveNoOverflowAndNoFallbackFonts : 1; 189 bool m_needsTranscoding : 1; 190 191 float m_minWidth; 192 float m_maxWidth; 193 float m_beginMinWidth; 194 float m_endMinWidth; 195 196 String m_text; 197 198 InlineTextBox* m_firstTextBox; 199 InlineTextBox* m_lastTextBox; 200}; 201 202inline UChar RenderText::uncheckedCharacterAt(unsigned i) const 203{ 204 ASSERT_WITH_SECURITY_IMPLICATION(i < textLength()); 205 return is8Bit() ? characters8()[i] : characters16()[i]; 206} 207 208inline UChar RenderText::characterAt(unsigned i) const 209{ 210 if (i >= textLength()) 211 return 0; 212 213 return uncheckedCharacterAt(i); 214} 215 216inline RenderText* toRenderText(RenderObject* object) 217{ 218 ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isText()); 219 return static_cast<RenderText*>(object); 220} 221 222inline const RenderText* toRenderText(const RenderObject* object) 223{ 224 ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isText()); 225 return static_cast<const RenderText*>(object); 226} 227 228// This will catch anyone doing an unnecessary cast. 229void toRenderText(const RenderText*); 230 231#ifdef NDEBUG 232inline void RenderText::checkConsistency() const 233{ 234} 235#endif 236 237void applyTextTransform(const RenderStyle*, String&, UChar); 238 239} // namespace WebCore 240 241#endif // RenderText_h 242