1 /*
2 * This file is part of the line box implementation for KDE.
3 *
4 * Copyright (C) 2003, 2006, 2007, 2008 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 RootInlineBox_h
24 #define RootInlineBox_h
25
26 #include "BidiContext.h"
27 #include "InlineFlowBox.h"
28
29 namespace WebCore {
30
31 class BidiStatus;
32 class EllipsisBox;
33 class HitTestResult;
34 struct GapRects;
35
36 class RootInlineBox : public InlineFlowBox {
37 public:
RootInlineBox(RenderObject * obj)38 RootInlineBox(RenderObject* obj)
39 : InlineFlowBox(obj)
40 , m_overflow(0)
41 , m_lineBreakObj(0)
42 , m_lineBreakPos(0)
43 {
44 }
45
isRootInlineBox()46 virtual bool isRootInlineBox() { return true; }
47
48 virtual void destroy(RenderArena*);
49 void detachEllipsisBox(RenderArena*);
50
nextRootBox()51 RootInlineBox* nextRootBox() { return static_cast<RootInlineBox*>(m_nextLine); }
prevRootBox()52 RootInlineBox* prevRootBox() { return static_cast<RootInlineBox*>(m_prevLine); }
53
54 virtual void adjustPosition(int dx, int dy);
55
topOverflow()56 virtual int topOverflow() { return m_overflow ? m_overflow->m_topOverflow : m_y; }
bottomOverflow()57 virtual int bottomOverflow() { return m_overflow ? m_overflow->m_bottomOverflow : m_y + m_height; }
leftOverflow()58 virtual int leftOverflow() { return m_overflow ? m_overflow->m_leftOverflow : m_x; }
rightOverflow()59 virtual int rightOverflow() { return m_overflow ? m_overflow->m_rightOverflow : m_x + m_width; }
60
61 virtual void setVerticalOverflowPositions(int top, int bottom);
62 void setHorizontalOverflowPositions(int left, int right);
63
64 virtual void setVerticalSelectionPositions(int top, int bottom);
65
66 #if ENABLE(SVG)
computePerCharacterLayoutInformation()67 virtual void computePerCharacterLayoutInformation() { }
68 #endif
69
lineBreakObj()70 RenderObject* lineBreakObj() const { return m_lineBreakObj; }
71 BidiStatus lineBreakBidiStatus() const;
72 void setLineBreakInfo(RenderObject*, unsigned breakPos, const BidiStatus&);
73
lineBreakPos()74 unsigned lineBreakPos() const { return m_lineBreakPos; }
setLineBreakPos(unsigned p)75 void setLineBreakPos(unsigned p) { m_lineBreakPos = p; }
76
blockHeight()77 int blockHeight() const { return m_blockHeight; }
setBlockHeight(int h)78 void setBlockHeight(int h) { m_blockHeight = h; }
79
endsWithBreak()80 bool endsWithBreak() const { return m_endsWithBreak; }
setEndsWithBreak(bool b)81 void setEndsWithBreak(bool b) { m_endsWithBreak = b; }
82
83 void childRemoved(InlineBox* box);
84
85 bool canAccommodateEllipsis(bool ltr, int blockEdge, int lineBoxEdge, int ellipsisWidth);
86 void placeEllipsis(const AtomicString& ellipsisStr, bool ltr, int blockEdge, int ellipsisWidth, InlineBox* markupBox = 0);
87 virtual int placeEllipsisBox(bool ltr, int blockEdge, int ellipsisWidth, bool& foundBox);
88
89 EllipsisBox* ellipsisBox() const;
90
91 void paintEllipsisBox(RenderObject::PaintInfo&, int tx, int ty) const;
92 bool hitTestEllipsisBox(HitTestResult&, int x, int y, int tx, int ty, HitTestAction, bool);
93
94 virtual void clearTruncation();
95
96 #if PLATFORM(MAC)
97 void addHighlightOverflow();
98 void paintCustomHighlight(RenderObject::PaintInfo&, int tx, int ty, const AtomicString& highlightType);
99 #endif
100
101 virtual void paint(RenderObject::PaintInfo&, int tx, int ty);
102 virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, int, int, int, int);
103
hasSelectedChildren()104 bool hasSelectedChildren() const { return m_hasSelectedChildren; }
105 void setHasSelectedChildren(bool);
106
107 virtual RenderObject::SelectionState selectionState();
108 InlineBox* firstSelectedBox();
109 InlineBox* lastSelectedBox();
110
111 GapRects fillLineSelectionGap(int selTop, int selHeight, RenderBlock* rootBlock, int blockX, int blockY,
112 int tx, int ty, const RenderObject::PaintInfo*);
113
114 RenderBlock* block() const;
115
116 int selectionTop();
selectionBottom()117 int selectionBottom() { return m_overflow ? m_overflow->m_selectionBottom : m_y + m_height; }
selectionHeight()118 int selectionHeight() { return max(0, selectionBottom() - selectionTop()); }
119
120 InlineBox* closestLeafChildForXPos(int x, bool onlyEditableLeaves = false);
121
floats()122 Vector<RenderBox*>& floats()
123 {
124 ASSERT(!isDirty());
125 if (!m_overflow)
126 m_overflow = new (m_object->renderArena()) Overflow(this);
127 return m_overflow->floats;
128 }
129
floatsPtr()130 Vector<RenderBox*>* floatsPtr() { ASSERT(!isDirty()); return m_overflow ? &m_overflow->floats : 0; }
131
132 protected:
133 // Normally we are only as tall as the style on our block dictates, but we might have content
134 // that spills out above the height of our font (e.g, a tall image), or something that extends further
135 // below our line (e.g., a child whose font has a huge descent).
136
137 // Allocated only when some of these fields have non-default values
138 struct Overflow {
OverflowOverflow139 Overflow(RootInlineBox* box)
140 : m_topOverflow(box->m_y)
141 , m_bottomOverflow(box->m_y + box->m_height)
142 , m_leftOverflow(box->m_x)
143 , m_rightOverflow(box->m_x + box->m_width)
144 , m_selectionTop(box->m_y)
145 , m_selectionBottom(box->m_y + box->m_height)
146 {
147 }
148
149 void destroy(RenderArena*);
150 void* operator new(size_t, RenderArena*) throw();
151 void operator delete(void*, size_t);
152
153 int m_topOverflow;
154 int m_bottomOverflow;
155 int m_leftOverflow;
156 int m_rightOverflow;
157 int m_selectionTop;
158 int m_selectionBottom;
159 // Floats hanging off the line are pushed into this vector during layout. It is only
160 // good for as long as the line has not been marked dirty.
161 Vector<RenderBox*> floats;
162 private:
163 void* operator new(size_t) throw();
164 };
165
166 Overflow* m_overflow;
167
168 // Where this line ended. The exact object and the position within that object are stored so that
169 // we can create an InlineIterator beginning just after the end of this line.
170 RenderObject* m_lineBreakObj;
171 unsigned m_lineBreakPos;
172 RefPtr<BidiContext> m_lineBreakContext;
173
174 // The height of the block at the end of this line. This is where the next line starts.
175 int m_blockHeight;
176
177 WTF::Unicode::Direction m_lineBreakBidiStatusEor : 5;
178 WTF::Unicode::Direction m_lineBreakBidiStatusLastStrong : 5;
179 WTF::Unicode::Direction m_lineBreakBidiStatusLast : 5;
180 };
181
setHorizontalOverflowPositions(int left,int right)182 inline void RootInlineBox::setHorizontalOverflowPositions(int left, int right)
183 {
184 if (!m_overflow) {
185 if (left == m_x && right == m_x + m_width)
186 return;
187 m_overflow = new (m_object->renderArena()) Overflow(this);
188 }
189 m_overflow->m_leftOverflow = left;
190 m_overflow->m_rightOverflow = right;
191 }
192
setVerticalSelectionPositions(int top,int bottom)193 inline void RootInlineBox::setVerticalSelectionPositions(int top, int bottom)
194 {
195 if (!m_overflow) {
196 if (top == m_y && bottom == m_y + m_height)
197 return;
198 m_overflow = new (m_object->renderArena()) Overflow(this);
199 }
200 m_overflow->m_selectionTop = top;
201 m_overflow->m_selectionBottom = bottom;
202 }
203
204 } // namespace WebCore
205
206 #endif // RootInlineBox_h
207