1 /*
2 * (C) 1999 Lars Knoll (knoll@kde.org)
3 * (C) 2000 Dirk Mueller (mueller@kde.org)
4 * Copyright (C) 2004, 2005, 2006, 2009, 2010, 2011 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 InlineTextBox_h
24 #define InlineTextBox_h
25
26 #include "core/rendering/InlineBox.h"
27 #include "core/rendering/RenderText.h" // so textRenderer() can be inline
28 #include "platform/text/TextRun.h"
29 #include "wtf/Forward.h"
30
31 namespace WebCore {
32
33 struct CompositionUnderline;
34 class DocumentMarker;
35 class GraphicsContext;
36
37 const unsigned short cNoTruncation = USHRT_MAX;
38 const unsigned short cFullTruncation = USHRT_MAX - 1;
39
40 // Helper functions shared by InlineTextBox / SVGRootInlineBox
41 void updateGraphicsContext(GraphicsContext*, const Color& fillColor, const Color& strokeColor, float strokeThickness, ColorSpace);
42 Color correctedTextColor(Color textColor, Color backgroundColor);
43
44 class InlineTextBox : public InlineBox {
45 public:
InlineTextBox(RenderObject & obj)46 InlineTextBox(RenderObject& obj)
47 : InlineBox(obj)
48 , m_prevTextBox(0)
49 , m_nextTextBox(0)
50 , m_start(0)
51 , m_len(0)
52 , m_truncation(cNoTruncation)
53 {
54 }
55
56 virtual void destroy() OVERRIDE FINAL;
57
prevTextBox()58 InlineTextBox* prevTextBox() const { return m_prevTextBox; }
nextTextBox()59 InlineTextBox* nextTextBox() const { return m_nextTextBox; }
setNextTextBox(InlineTextBox * n)60 void setNextTextBox(InlineTextBox* n) { m_nextTextBox = n; }
setPreviousTextBox(InlineTextBox * p)61 void setPreviousTextBox(InlineTextBox* p) { m_prevTextBox = p; }
62
63 // FIXME: These accessors should ASSERT(!isDirty()). See https://bugs.webkit.org/show_bug.cgi?id=97264
start()64 unsigned start() const { return m_start; }
end()65 unsigned end() const { return m_len ? m_start + m_len - 1 : m_start; }
len()66 unsigned len() const { return m_len; }
67
setStart(unsigned start)68 void setStart(unsigned start) { m_start = start; }
setLen(unsigned len)69 void setLen(unsigned len) { m_len = len; }
70
offsetRun(int d)71 void offsetRun(int d) { ASSERT(!isDirty()); m_start += d; }
72
truncation()73 unsigned short truncation() { return m_truncation; }
74
75 virtual void markDirty() OVERRIDE FINAL;
76
77 using InlineBox::hasHyphen;
78 using InlineBox::setHasHyphen;
79 using InlineBox::canHaveLeadingExpansion;
80 using InlineBox::setCanHaveLeadingExpansion;
81
compareByStart(const InlineTextBox * first,const InlineTextBox * second)82 static inline bool compareByStart(const InlineTextBox* first, const InlineTextBox* second) { return first->start() < second->start(); }
83
84 virtual int baselinePosition(FontBaseline) const OVERRIDE FINAL;
85 virtual LayoutUnit lineHeight() const OVERRIDE FINAL;
86
87 bool getEmphasisMarkPosition(RenderStyle*, TextEmphasisPosition&) const;
88
89 LayoutRect logicalOverflowRect() const;
90 void setLogicalOverflowRect(const LayoutRect&);
logicalTopVisualOverflow()91 LayoutUnit logicalTopVisualOverflow() const { return logicalOverflowRect().y(); }
logicalBottomVisualOverflow()92 LayoutUnit logicalBottomVisualOverflow() const { return logicalOverflowRect().maxY(); }
logicalLeftVisualOverflow()93 LayoutUnit logicalLeftVisualOverflow() const { return logicalOverflowRect().x(); }
logicalRightVisualOverflow()94 LayoutUnit logicalRightVisualOverflow() const { return logicalOverflowRect().maxX(); }
95
96 #ifndef NDEBUG
97 virtual void showBox(int = 0) const OVERRIDE;
98 virtual const char* boxName() const OVERRIDE;
99 #endif
100
101 enum RotationDirection { Counterclockwise, Clockwise };
102 static AffineTransform rotation(const FloatRect& boxRect, RotationDirection);
103 private:
104 LayoutUnit selectionTop();
105 LayoutUnit selectionBottom();
106 LayoutUnit selectionHeight();
107
108 // charactersWithHyphen, if provided, must not be destroyed before the TextRun.
109 TextRun constructTextRun(RenderStyle*, const Font&, StringBuilder* charactersWithHyphen = 0) const;
110 TextRun constructTextRun(RenderStyle*, const Font&, StringView, int maximumLength, StringBuilder* charactersWithHyphen = 0) const;
111
112 public:
113 TextRun constructTextRunForInspector(RenderStyle*, const Font&) const;
calculateBoundaries()114 virtual FloatRect calculateBoundaries() const OVERRIDE { return FloatRect(x(), y(), width(), height()); }
115
116 virtual LayoutRect localSelectionRect(int startPos, int endPos);
117 bool isSelected(int startPos, int endPos) const;
118 void selectionStartEnd(int& sPos, int& ePos);
119
120 protected:
121 virtual void paint(PaintInfo&, const LayoutPoint&, LayoutUnit lineTop, LayoutUnit lineBottom) OVERRIDE;
122 virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, LayoutUnit lineTop, LayoutUnit lineBottom) OVERRIDE;
123
124 public:
125 RenderText& textRenderer() const;
126
127 private:
128 virtual void deleteLine() OVERRIDE FINAL;
129 virtual void extractLine() OVERRIDE FINAL;
130 virtual void attachLine() OVERRIDE FINAL;
131
132 public:
133 virtual RenderObject::SelectionState selectionState() OVERRIDE FINAL;
134
135 private:
clearTruncation()136 virtual void clearTruncation() OVERRIDE FINAL { m_truncation = cNoTruncation; }
137 virtual float placeEllipsisBox(bool flowIsLTR, float visibleLeftEdge, float visibleRightEdge, float ellipsisWidth, float &truncatedWidth, bool& foundBox) OVERRIDE FINAL;
138
139 public:
140 virtual bool isLineBreak() const OVERRIDE FINAL;
141
setExpansion(int newExpansion)142 void setExpansion(int newExpansion)
143 {
144 m_logicalWidth -= expansion();
145 InlineBox::setExpansion(newExpansion);
146 m_logicalWidth += newExpansion;
147 }
148
149 private:
isInlineTextBox()150 virtual bool isInlineTextBox() const OVERRIDE FINAL { return true; }
151
152 public:
153 virtual int caretMinOffset() const OVERRIDE FINAL;
154 virtual int caretMaxOffset() const OVERRIDE FINAL;
155
156 private:
157 float textPos() const; // returns the x position relative to the left start of the text line.
158
159 public:
160 virtual int offsetForPosition(float x, bool includePartialGlyphs = true) const;
161 virtual float positionForOffset(int offset) const;
162
163 bool containsCaretOffset(int offset) const; // false for offset after line break
164
165 // Fills a vector with the pixel width of each character.
166 void characterWidths(Vector<float>&) const;
167
168 private:
169 InlineTextBox* m_prevTextBox; // The previous box that also uses our RenderObject
170 InlineTextBox* m_nextTextBox; // The next box that also uses our RenderObject
171
172 int m_start;
173 unsigned short m_len;
174
175 unsigned short m_truncation; // Where to truncate when text overflow is applied. We use special constants to
176 // denote no truncation (the whole run paints) and full truncation (nothing paints at all).
177
178 unsigned underlinePaintStart(const CompositionUnderline&);
179 unsigned underlinePaintEnd(const CompositionUnderline&);
180
181 protected:
182 void paintSingleCompositionBackgroundRun(GraphicsContext*, const FloatPoint& boxOrigin, RenderStyle*, const Font&, Color backgroundColor, int startPos, int endPos);
183 void paintCompositionBackgrounds(GraphicsContext*, const FloatPoint& boxOrigin, RenderStyle*, const Font&, bool useCustomUnderlines);
184 void paintDocumentMarkers(GraphicsContext*, const FloatPoint& boxOrigin, RenderStyle*, const Font&, bool background);
185 void paintCompositionUnderline(GraphicsContext*, const FloatPoint& boxOrigin, const CompositionUnderline&);
186
187 // These functions both paint markers and update the DocumentMarker's renderedRect.
188 virtual void paintDocumentMarker(GraphicsContext*, const FloatPoint& boxOrigin, DocumentMarker*, RenderStyle*, const Font&, bool grammar);
189 virtual void paintTextMatchMarker(GraphicsContext*, const FloatPoint& boxOrigin, DocumentMarker*, RenderStyle*, const Font&);
190
191 private:
192 void paintDecoration(GraphicsContext*, const FloatPoint& boxOrigin, TextDecoration, const ShadowList*);
193 void paintSelection(GraphicsContext*, const FloatPoint& boxOrigin, RenderStyle*, const Font&, Color textColor);
194
expansionBehavior()195 TextRun::ExpansionBehavior expansionBehavior() const
196 {
197 return (canHaveLeadingExpansion() ? TextRun::AllowLeadingExpansion : TextRun::ForbidLeadingExpansion)
198 | (expansion() && nextLeafChild() ? TextRun::AllowTrailingExpansion : TextRun::ForbidTrailingExpansion);
199 }
200 };
201
202 DEFINE_INLINE_BOX_TYPE_CASTS(InlineTextBox);
203
textRenderer()204 inline RenderText& InlineTextBox::textRenderer() const
205 {
206 return toRenderText(renderer());
207 }
208
209 void alignSelectionRectToDevicePixels(FloatRect&);
210
rotation(const FloatRect & boxRect,RotationDirection rotationDirection)211 inline AffineTransform InlineTextBox::rotation(const FloatRect& boxRect, RotationDirection rotationDirection)
212 {
213 return rotationDirection == Clockwise ? AffineTransform(0, 1, -1, 0, boxRect.x() + boxRect.maxY(), boxRect.maxY() - boxRect.x())
214 : AffineTransform(0, -1, 1, 0, boxRect.x() - boxRect.maxY(), boxRect.x() + boxRect.maxY());
215 }
216
217 } // namespace WebCore
218
219 #endif // InlineTextBox_h
220