1 /* 2 * (C) 1999 Lars Knoll (knoll (at) kde.org) 3 * (C) 2000 Dirk Mueller (mueller (at) 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 "core/rendering/RenderObject.h" 27 #include "core/rendering/RenderView.h" 28 #include "wtf/Forward.h" 29 30 namespace WebCore { 31 32 class InlineTextBox; 33 34 class RenderText : public RenderObject { 35 public: 36 // FIXME: If the node argument is not a Text node or the string argument is 37 // not the content of the Text node, updating text-transform property 38 // doesn't re-transform the string. 39 RenderText(Node*, PassRefPtr<StringImpl>); 40 #ifndef NDEBUG 41 virtual ~RenderText(); 42 #endif 43 44 virtual const char* renderName() const; 45 46 virtual bool isTextFragment() const; 47 virtual bool isWordBreak() const; 48 49 virtual PassRefPtr<StringImpl> originalText() const; 50 51 void extractTextBox(InlineTextBox*); 52 void attachTextBox(InlineTextBox*); 53 void removeTextBox(InlineTextBox*); 54 55 const String& text() const { return m_text; } 56 String textWithoutTranscoding() const; 57 58 InlineTextBox* createInlineTextBox(); 59 void dirtyLineBoxes(bool fullLayout); 60 61 virtual void absoluteRects(Vector<IntRect>&, const LayoutPoint& accumulatedOffset) const OVERRIDE FINAL; 62 void absoluteRectsForRange(Vector<IntRect>&, unsigned startOffset = 0, unsigned endOffset = INT_MAX, bool useSelectionHeight = false, bool* wasFixed = 0); 63 64 virtual void absoluteQuads(Vector<FloatQuad>&, bool* wasFixed) const OVERRIDE FINAL; 65 void absoluteQuadsForRange(Vector<FloatQuad>&, unsigned startOffset = 0, unsigned endOffset = INT_MAX, bool useSelectionHeight = false, bool* wasFixed = 0); 66 67 enum ClippingOption { NoClipping, ClipToEllipsis }; 68 void absoluteQuads(Vector<FloatQuad>&, bool* wasFixed = 0, ClippingOption = NoClipping) const; 69 70 virtual PositionWithAffinity positionForPoint(const LayoutPoint&) OVERRIDE; 71 72 bool is8Bit() const { return m_text.is8Bit(); } 73 const LChar* characters8() const { return m_text.impl()->characters8(); } 74 const UChar* characters16() const { return m_text.impl()->characters16(); } 75 bool hasEmptyText() const { return m_text.isEmpty(); } 76 String substring(unsigned position, unsigned length) const { return m_text.substring(position, length); } 77 UChar characterAt(unsigned) const; 78 UChar uncheckedCharacterAt(unsigned) const; 79 UChar operator[](unsigned i) const { return uncheckedCharacterAt(i); } 80 unsigned textLength() const { return m_text.length(); } // non virtual implementation of length() 81 void positionLineBox(InlineBox*); 82 83 virtual float width(unsigned from, unsigned len, const Font&, float xPos, HashSet<const SimpleFontData*>* fallbackFonts = 0, GlyphOverflow* = 0) const; 84 virtual float width(unsigned from, unsigned len, float xPos, bool firstLine = false, HashSet<const SimpleFontData*>* fallbackFonts = 0, GlyphOverflow* = 0) const; 85 86 float minLogicalWidth() const; 87 float maxLogicalWidth() const; 88 89 void trimmedPrefWidths(float leadWidth, 90 float& firstLineMinWidth, bool& hasBreakableStart, 91 float& lastLineMinWidth, bool& hasBreakableEnd, 92 bool& hasBreakableChar, bool& hasBreak, 93 float& firstLineMaxWidth, float& lastLineMaxWidth, 94 float& minWidth, float& maxWidth, bool& stripFrontSpaces); 95 96 virtual IntRect linesBoundingBox() const; 97 LayoutRect linesVisualOverflowBoundingBox() const; 98 99 FloatPoint firstRunOrigin() const; 100 float firstRunX() const; 101 float firstRunY() const; 102 103 virtual void setText(PassRefPtr<StringImpl>, bool force = false); 104 void setTextWithOffset(PassRefPtr<StringImpl>, unsigned offset, unsigned len, bool force = false); 105 106 virtual void transformText(); 107 108 virtual bool canBeSelectionLeaf() const { return true; } 109 virtual void setSelectionState(SelectionState s) OVERRIDE FINAL; 110 virtual LayoutRect selectionRectForRepaint(const RenderLayerModelObject* repaintContainer, bool clipToVisibleContent = true) OVERRIDE; 111 virtual LayoutRect localCaretRect(InlineBox*, int caretOffset, LayoutUnit* extraWidthToEndOfLine = 0); 112 113 LayoutUnit marginLeft() const { return minimumValueForLength(style()->marginLeft(), 0, view()); } 114 LayoutUnit marginRight() const { return minimumValueForLength(style()->marginRight(), 0, view()); } 115 116 virtual LayoutRect clippedOverflowRectForRepaint(const RenderLayerModelObject* repaintContainer) const OVERRIDE FINAL; 117 118 InlineTextBox* firstTextBox() const { return m_firstTextBox; } 119 InlineTextBox* lastTextBox() const { return m_lastTextBox; } 120 121 virtual int caretMinOffset() const; 122 virtual int caretMaxOffset() const; 123 unsigned renderedTextLength() const; 124 125 virtual int previousOffset(int current) const OVERRIDE FINAL; 126 virtual int previousOffsetForBackwardDeletion(int current) const OVERRIDE FINAL; 127 virtual int nextOffset(int current) const OVERRIDE FINAL; 128 129 bool containsReversedText() const { return m_containsReversedText; } 130 131 bool isSecure() const { return style()->textSecurity() != TSNONE; } 132 void momentarilyRevealLastTypedCharacter(unsigned lastTypedCharacterOffset); 133 134 InlineTextBox* findNextInlineTextBox(int offset, int& pos) const; 135 136 void checkConsistency() const; 137 138 bool isAllCollapsibleWhitespace() const; 139 140 bool canUseSimpleFontCodePath() const { return m_canUseSimpleFontCodePath; } 141 bool knownToHaveNoOverflowAndNoFallbackFonts() const { return m_knownToHaveNoOverflowAndNoFallbackFonts; } 142 143 void removeAndDestroyTextBoxes(); 144 145 protected: 146 virtual void computePreferredLogicalWidths(float leadWidth); 147 virtual void willBeDestroyed(); 148 149 virtual void styleWillChange(StyleDifference, const RenderStyle*) OVERRIDE FINAL { } 150 virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle); 151 152 virtual void setTextInternal(PassRefPtr<StringImpl>); 153 virtual UChar previousCharacter() const; 154 155 virtual void addLayerHitTestRects(LayerHitTestRects&, const RenderLayer* currentLayer, const LayoutPoint& layerOffset, const LayoutRect& containerRect) const OVERRIDE; 156 157 virtual InlineTextBox* createTextBox(); // Subclassed by SVG. 158 159 private: 160 void computePreferredLogicalWidths(float leadWidth, HashSet<const SimpleFontData*>& fallbackFonts, GlyphOverflow&); 161 162 bool computeCanUseSimpleFontCodePath() const; 163 164 // Make length() private so that callers that have a RenderText* 165 // will use the more efficient textLength() instead, while 166 // callers with a RenderObject* can continue to use length(). 167 virtual unsigned length() const OVERRIDE FINAL { return textLength(); } 168 169 virtual void paint(PaintInfo&, const LayoutPoint&) OVERRIDE FINAL { ASSERT_NOT_REACHED(); } 170 virtual void layout() OVERRIDE FINAL { ASSERT_NOT_REACHED(); } 171 virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation&, const LayoutPoint&, HitTestAction) OVERRIDE FINAL { ASSERT_NOT_REACHED(); return false; } 172 173 void deleteTextBoxes(); 174 bool containsOnlyWhitespace(unsigned from, unsigned len) const; 175 float widthFromCache(const Font&, int start, int len, float xPos, HashSet<const SimpleFontData*>* fallbackFonts, GlyphOverflow*) const; 176 bool isAllASCII() const { return m_isAllASCII; } 177 void updateNeedsTranscoding(); 178 179 void secureText(UChar mask); 180 181 // We put the bitfield first to minimize padding on 64-bit. 182 bool m_hasBreakableChar : 1; // Whether or not we can be broken into multiple lines. 183 bool m_hasBreak : 1; // Whether or not we have a hard break (e.g., <pre> with '\n'). 184 bool m_hasTab : 1; // Whether or not we have a variable width tab character (e.g., <pre> with '\t'). 185 bool m_hasBreakableStart : 1; 186 bool m_hasBreakableEnd : 1; 187 bool m_hasEndWhiteSpace : 1; 188 bool m_linesDirty : 1; // This bit indicates that the text run has already dirtied specific 189 // line boxes, and this hint will enable layoutInlineChildren to avoid 190 // just dirtying everything when character data is modified (e.g., appended/inserted 191 // or removed). 192 bool m_containsReversedText : 1; 193 bool m_isAllASCII : 1; 194 bool m_canUseSimpleFontCodePath : 1; 195 mutable bool m_knownToHaveNoOverflowAndNoFallbackFonts : 1; 196 bool m_needsTranscoding : 1; 197 198 float m_minWidth; 199 float m_maxWidth; 200 float m_firstLineMinWidth; 201 float m_lastLineLineMinWidth; 202 203 String m_text; 204 205 InlineTextBox* m_firstTextBox; 206 InlineTextBox* m_lastTextBox; 207 }; 208 209 inline UChar RenderText::uncheckedCharacterAt(unsigned i) const 210 { 211 ASSERT_WITH_SECURITY_IMPLICATION(i < textLength()); 212 return is8Bit() ? characters8()[i] : characters16()[i]; 213 } 214 215 inline UChar RenderText::characterAt(unsigned i) const 216 { 217 if (i >= textLength()) 218 return 0; 219 220 return uncheckedCharacterAt(i); 221 } 222 223 inline RenderText* toRenderText(RenderObject* object) 224 { 225 ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isText()); 226 return static_cast<RenderText*>(object); 227 } 228 229 inline const RenderText* toRenderText(const RenderObject* object) 230 { 231 ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isText()); 232 return static_cast<const RenderText*>(object); 233 } 234 235 // This will catch anyone doing an unnecessary cast. 236 void toRenderText(const RenderText*); 237 238 #ifdef NDEBUG 239 inline void RenderText::checkConsistency() const 240 { 241 } 242 #endif 243 244 void applyTextTransform(const RenderStyle*, String&, UChar); 245 246 } // namespace WebCore 247 248 #endif // RenderText_h 249
