1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
|
/*
* Copyright (C) 2011 Adobe Systems Incorporated. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
* 2. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
* OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
* TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
* THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef RenderFlowThread_h
#define RenderFlowThread_h
#include "RenderBlock.h"
#include <wtf/HashCountedSet.h>
#include <wtf/ListHashSet.h>
#include <wtf/PassRefPtr.h>
#include <wtf/UnusedParam.h>
namespace WebCore {
class RenderFlowThread;
class RenderStyle;
class RenderRegion;
typedef ListHashSet<RenderRegion*> RenderRegionList;
// RenderFlowThread is used to collect all the render objects that participate in a
// flow thread. It will also help in doing the layout. However, it will not render
// directly to screen. Instead, RenderRegion objects will redirect their paint
// and nodeAtPoint methods to this object. Each RenderRegion will actually be a viewPort
// of the RenderFlowThread.
class RenderFlowThread: public RenderBlock {
public:
RenderFlowThread(Node*);
virtual ~RenderFlowThread() { };
virtual bool isRenderFlowThread() const { return true; }
virtual void layout();
// Always create a RenderLayer for the RenderFlowThread so that we
// can easily avoid drawing the children directly.
virtual bool requiresLayer() const { return true; }
void removeFlowChildInfo(RenderObject*);
#ifndef NDEBUG
bool hasChildInfo(RenderObject* child) const { return child && child->isBox() && m_regionRangeMap.contains(toRenderBox(child)); }
#endif
virtual void addRegionToThread(RenderRegion*);
virtual void removeRegionFromThread(RenderRegion*);
const RenderRegionList& renderRegionList() const { return m_regionList; }
void computeLogicalWidth();
void computeLogicalHeight();
void paintIntoRegion(PaintInfo&, RenderRegion*, const LayoutPoint& paintOffset);
bool hitTestRegion(RenderRegion*, const HitTestRequest&, HitTestResult&, const LayoutPoint& pointInContainer, const LayoutPoint& accumulatedOffset);
bool hasRegions() const { return m_regionList.size(); }
bool hasValidRegions() const { ASSERT(!m_regionsInvalidated); return m_hasValidRegions; }
// Check if the content is flown into at least a region with region styling rules.
bool hasRegionsWithStyling() const { return m_hasRegionsWithStyling; }
void checkRegionsWithStyling();
void invalidateRegions() { m_regionsInvalidated = true; setNeedsLayout(true); }
bool hasValidRegionInfo() const { return !m_regionsInvalidated && hasValidRegions(); }
static PassRefPtr<RenderStyle> createFlowThreadStyle(RenderStyle* parentStyle);
void styleDidChange(StyleDifference, const RenderStyle* oldStyle);
void repaintRectangleInRegions(const LayoutRect&, bool immediate);
LayoutUnit regionLogicalTopForLine(LayoutUnit position) const;
LayoutUnit regionLogicalWidthForLine(LayoutUnit position) const;
LayoutUnit regionLogicalHeightForLine(LayoutUnit position) const;
LayoutUnit regionRemainingLogicalHeightForLine(LayoutUnit position, PageBoundaryRule = IncludePageBoundary) const;
RenderRegion* renderRegionForLine(LayoutUnit position, bool extendLastRegion = false) const;
bool regionsHaveUniformLogicalWidth() const { return m_regionsHaveUniformLogicalWidth; }
bool regionsHaveUniformLogicalHeight() const { return m_regionsHaveUniformLogicalHeight; }
RenderRegion* mapFromFlowToRegion(TransformState&) const;
void removeRenderBoxRegionInfo(RenderBox*);
bool logicalWidthChangedInRegions(const RenderBlock*, LayoutUnit offsetFromLogicalTopOfFirstPage);
LayoutUnit contentLogicalWidthOfFirstRegion() const;
LayoutUnit contentLogicalHeightOfFirstRegion() const;
LayoutUnit contentLogicalLeftOfFirstRegion() const;
RenderRegion* firstRegion() const;
RenderRegion* lastRegion() const;
void setRegionRangeForBox(const RenderBox*, LayoutUnit offsetFromLogicalTopOfFirstPage);
void getRegionRangeForBox(const RenderBox*, RenderRegion*& startRegion, RenderRegion*& endRegion) const;
void clearRenderObjectCustomStyle(const RenderObject*,
const RenderRegion* oldStartRegion = 0, const RenderRegion* oldEndRegion = 0,
const RenderRegion* newStartRegion = 0, const RenderRegion* newEndRegion = 0);
void computeOverflowStateForRegions(LayoutUnit oldClientAfterEdge);
bool overset() const { return m_overset; }
// Check if the object is in region and the region is part of this flow thread.
bool objectInFlowRegion(const RenderObject*, const RenderRegion*) const;
protected:
virtual const char* renderName() const = 0;
bool shouldRepaint(const LayoutRect&) const;
void regionLayoutUpdateEventTimerFired(Timer<RenderFlowThread>*);
bool regionInRange(const RenderRegion* targetRegion, const RenderRegion* startRegion, const RenderRegion* endRegion) const;
RenderRegionList m_regionList;
class RenderRegionRange {
public:
RenderRegionRange()
{
setRange(0, 0);
}
RenderRegionRange(RenderRegion* start, RenderRegion* end)
{
setRange(start, end);
}
void setRange(RenderRegion* start, RenderRegion* end)
{
m_startRegion = start;
m_endRegion = end;
}
RenderRegion* startRegion() const { return m_startRegion; }
RenderRegion* endRegion() const { return m_endRegion; }
private:
RenderRegion* m_startRegion;
RenderRegion* m_endRegion;
};
// A maps from RenderBox
typedef HashMap<const RenderBox*, RenderRegionRange> RenderRegionRangeMap;
RenderRegionRangeMap m_regionRangeMap;
bool m_hasValidRegions;
bool m_regionsInvalidated;
bool m_regionsHaveUniformLogicalWidth;
bool m_regionsHaveUniformLogicalHeight;
bool m_overset;
bool m_hasRegionsWithStyling;
Timer<RenderFlowThread> m_regionLayoutUpdateEventTimer;
};
inline RenderFlowThread* toRenderFlowThread(RenderObject* object)
{
ASSERT(!object || object->isRenderFlowThread());
return static_cast<RenderFlowThread*>(object);
}
inline const RenderFlowThread* toRenderFlowThread(const RenderObject* object)
{
ASSERT(!object || object->isRenderFlowThread());
return static_cast<const RenderFlowThread*>(object);
}
// This will catch anyone doing an unnecessary cast.
void toRenderFlowThread(const RenderFlowThread*);
} // namespace WebCore
#endif // RenderFlowThread_h
|
