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, 2013 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 "RenderElement.h" 27#include "RenderTextLineBoxes.h" 28#include "SimpleLineLayout.h" 29#include "Text.h" 30#include <wtf/Forward.h> 31 32namespace WebCore { 33 34class InlineTextBox; 35 36class RenderText : public RenderObject { 37public: 38 RenderText(Text&, const String&); 39 RenderText(Document&, const String&); 40 41 virtual ~RenderText(); 42 43 virtual const char* renderName() const override; 44 45 Text* textNode() const; 46 47 virtual bool isTextFragment() const; 48 49 RenderStyle& style() const; 50 RenderStyle& firstLineStyle() const; 51 52 virtual String originalText() const; 53 54 void extractTextBox(InlineTextBox& box) { m_lineBoxes.extract(box); } 55 void attachTextBox(InlineTextBox& box) { m_lineBoxes.attach(box); } 56 void removeTextBox(InlineTextBox& box) { m_lineBoxes.remove(box); } 57 58 StringImpl* text() const { return m_text.impl(); } 59 String textWithoutConvertingBackslashToYenSymbol() const; 60 61 InlineTextBox* createInlineTextBox() { return m_lineBoxes.createAndAppendLineBox(*this); } 62 void dirtyLineBoxes(bool fullLayout); 63 64 virtual void absoluteRects(Vector<IntRect>&, const LayoutPoint& accumulatedOffset) const override final; 65 Vector<IntRect> absoluteRectsForRange(unsigned startOffset = 0, unsigned endOffset = UINT_MAX, bool useSelectionHeight = false, bool* wasFixed = nullptr) const; 66#if PLATFORM(IOS) 67 virtual void collectSelectionRects(Vector<SelectionRect>&, unsigned startOffset = 0, unsigned endOffset = std::numeric_limits<unsigned>::max()) override; 68#endif 69 70 virtual void absoluteQuads(Vector<FloatQuad>&, bool* wasFixed) const override final; 71 Vector<FloatQuad> absoluteQuadsForRange(unsigned startOffset = 0, unsigned endOffset = UINT_MAX, bool useSelectionHeight = false, bool* wasFixed = nullptr) const; 72 73 Vector<FloatQuad> absoluteQuadsClippedToEllipsis() const; 74 75 virtual VisiblePosition positionForPoint(const LayoutPoint&, const RenderRegion*) override; 76 77 bool is8Bit() const { return m_text.impl()->is8Bit(); } 78 const LChar* characters8() const { return m_text.impl()->characters8(); } 79 const UChar* characters16() const { return m_text.impl()->characters16(); } 80 UChar characterAt(unsigned) const; 81 UChar uncheckedCharacterAt(unsigned) const; 82 UChar operator[](unsigned i) const { return uncheckedCharacterAt(i); } 83 unsigned textLength() const { return m_text.impl()->length(); } // non virtual implementation of length() 84 void positionLineBox(InlineTextBox&); 85 86 virtual float width(unsigned from, unsigned len, const Font&, float xPos, HashSet<const SimpleFontData*>* fallbackFonts = 0, GlyphOverflow* = 0) const; 87 virtual float width(unsigned from, unsigned len, float xPos, bool firstLine = false, HashSet<const SimpleFontData*>* fallbackFonts = 0, GlyphOverflow* = 0) const; 88 89 float minLogicalWidth() const; 90 float maxLogicalWidth() const; 91 92 void trimmedPrefWidths(float leadWidth, 93 float& beginMinW, bool& beginWS, 94 float& endMinW, bool& endWS, 95 bool& hasBreakableChar, bool& hasBreak, 96 float& beginMaxW, float& endMaxW, 97 float& minW, float& maxW, bool& stripFrontSpaces); 98 99 virtual IntRect linesBoundingBox() const; 100 LayoutRect linesVisualOverflowBoundingBox() const; 101 102 IntPoint firstRunLocation() const; 103 104 virtual void setText(const String&, bool force = false); 105 void setTextWithOffset(const String&, unsigned offset, unsigned len, bool force = false); 106 107 virtual bool canBeSelectionLeaf() const override { return true; } 108 virtual void setSelectionState(SelectionState) override final; 109 virtual LayoutRect selectionRectForRepaint(const RenderLayerModelObject* repaintContainer, bool clipToVisibleContent = true) override; 110 virtual LayoutRect localCaretRect(InlineBox*, int caretOffset, LayoutUnit* extraWidthToEndOfLine = 0) override; 111 112 LayoutRect collectSelectionRectsForLineBoxes(const RenderLayerModelObject* repaintContainer, bool clipToVisibleContent, Vector<LayoutRect>& rects); 113 114 LayoutUnit marginLeft() const { return minimumValueForLength(style().marginLeft(), 0); } 115 LayoutUnit marginRight() const { return minimumValueForLength(style().marginRight(), 0); } 116 117 virtual LayoutRect clippedOverflowRectForRepaint(const RenderLayerModelObject* repaintContainer) const override final; 118 119 InlineTextBox* firstTextBox() const { return m_lineBoxes.first(); } 120 InlineTextBox* lastTextBox() const { return m_lineBoxes.last(); } 121 122 virtual int caretMinOffset() const override; 123 virtual int caretMaxOffset() const override; 124 unsigned countRenderedCharacterOffsetsUntil(unsigned) const; 125 bool containsRenderedCharacterOffset(unsigned) const; 126 bool containsCaretOffset(unsigned) const; 127 bool hasRenderedText() const; 128 129 virtual int previousOffset(int current) const override final; 130 virtual int previousOffsetForBackwardDeletion(int current) const override final; 131 virtual int nextOffset(int current) const override final; 132 133 bool containsReversedText() const { return m_containsReversedText; } 134 135 bool isSecure() const { return style().textSecurity() != TSNONE; } 136 void momentarilyRevealLastTypedCharacter(unsigned lastTypedCharacterOffset); 137 138 InlineTextBox* findNextInlineTextBox(int offset, int& pos) const { return m_lineBoxes.findNext(offset, pos); } 139 140 bool isAllCollapsibleWhitespace() const; 141 142 bool canUseSimpleFontCodePath() const { return m_canUseSimpleFontCodePath; } 143 144 void removeAndDestroyTextBoxes(); 145 146 virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle); 147 148 virtual std::unique_ptr<InlineTextBox> createTextBox(); // Subclassed by RenderSVGInlineText. 149 150#if ENABLE(IOS_TEXT_AUTOSIZING) 151 float candidateComputedTextSize() const { return m_candidateComputedTextSize; } 152 void setCandidateComputedTextSize(float s) { m_candidateComputedTextSize = s; } 153#endif 154 155 void ensureLineBoxes(); 156 void deleteLineBoxesBeforeSimpleLineLayout(); 157 const SimpleLineLayout::Layout* simpleLineLayout() const; 158 159protected: 160 virtual void computePreferredLogicalWidths(float leadWidth); 161 virtual void willBeDestroyed() override; 162 163 virtual void setRenderedText(const String&); 164 virtual UChar previousCharacter() const; 165 166private: 167 RenderText(Node&, const String&); 168 169 virtual bool canHaveChildren() const override final { return false; } 170 171 void computePreferredLogicalWidths(float leadWidth, HashSet<const SimpleFontData*>& fallbackFonts, GlyphOverflow&); 172 173 bool computeCanUseSimpleFontCodePath() const; 174 175 // Make length() private so that callers that have a RenderText* 176 // will use the more efficient textLength() instead, while 177 // callers with a RenderObject* can continue to use length(). 178 virtual unsigned length() const override final { return textLength(); } 179 180 virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation&, const LayoutPoint&, HitTestAction) override final { ASSERT_NOT_REACHED(); return false; } 181 182 bool containsOnlyWhitespace(unsigned from, unsigned len) const; 183 float widthFromCache(const Font&, int start, int len, float xPos, HashSet<const SimpleFontData*>* fallbackFonts, GlyphOverflow*, const RenderStyle&) const; 184 bool isAllASCII() const { return m_isAllASCII; } 185 bool computeUseBackslashAsYenSymbol() const; 186 187 void secureText(UChar mask); 188 189 LayoutRect collectSelectionRectsForLineBoxes(const RenderLayerModelObject* repaintContainer, bool clipToVisibleContent, Vector<LayoutRect>*); 190 191 void node() const = delete; 192 193 // We put the bitfield first to minimize padding on 64-bit. 194 bool m_hasBreakableChar : 1; // Whether or not we can be broken into multiple lines. 195 bool m_hasBreak : 1; // Whether or not we have a hard break (e.g., <pre> with '\n'). 196 bool m_hasTab : 1; // Whether or not we have a variable width tab character (e.g., <pre> with '\t'). 197 bool m_hasBeginWS : 1; // Whether or not we begin with WS (only true if we aren't pre) 198 bool m_hasEndWS : 1; // Whether or not we end with WS (only true if we aren't pre) 199 bool m_linesDirty : 1; // This bit indicates that the text run has already dirtied specific 200 // line boxes, and this hint will enable layoutInlineChildren to avoid 201 // just dirtying everything when character data is modified (e.g., appended/inserted 202 // or removed). 203 bool m_containsReversedText : 1; 204 bool m_isAllASCII : 1; 205 bool m_canUseSimpleFontCodePath : 1; 206 mutable bool m_knownToHaveNoOverflowAndNoFallbackFonts : 1; 207 bool m_useBackslashAsYenSymbol : 1; 208 bool m_originalTextDiffersFromRendered : 1; 209 210#if ENABLE(IOS_TEXT_AUTOSIZING) 211 // FIXME: This should probably be part of the text sizing structures in Document instead. That would save some memory. 212 float m_candidateComputedTextSize; 213#endif 214 float m_minWidth; 215 float m_maxWidth; 216 float m_beginMinWidth; 217 float m_endMinWidth; 218 219 String m_text; 220 221 RenderTextLineBoxes m_lineBoxes; 222}; 223 224RENDER_OBJECT_TYPE_CASTS(RenderText, isText()) 225 226inline UChar RenderText::uncheckedCharacterAt(unsigned i) const 227{ 228 ASSERT_WITH_SECURITY_IMPLICATION(i < textLength()); 229 return is8Bit() ? characters8()[i] : characters16()[i]; 230} 231 232inline UChar RenderText::characterAt(unsigned i) const 233{ 234 if (i >= textLength()) 235 return 0; 236 237 return uncheckedCharacterAt(i); 238} 239 240inline RenderStyle& RenderText::style() const 241{ 242 return parent()->style(); 243} 244 245inline RenderStyle& RenderText::firstLineStyle() const 246{ 247 return parent()->firstLineStyle(); 248} 249 250void applyTextTransform(const RenderStyle&, String&, UChar); 251void makeCapitalized(String*, UChar previous); 252 253inline RenderText* Text::renderer() const 254{ 255 return toRenderText(Node::renderer()); 256} 257 258} // namespace WebCore 259 260#endif // RenderText_h 261