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