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
|
/*
* Copyright (C) 2013 Apple Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#ifndef LogicalSelectionOffsetCaches_h
#define LogicalSelectionOffsetCaches_h
#include "RenderBlock.h"
namespace WebCore {
class LogicalSelectionOffsetCaches {
public:
class ContainingBlockInfo {
public:
ContainingBlockInfo()
: m_hasFloatsOrFlowThreads(false)
, m_cachedLogicalLeftSelectionOffset(false)
, m_cachedLogicalRightSelectionOffset(false)
{ }
void setBlock(RenderBlock* block, const LogicalSelectionOffsetCaches* cache, bool parentCacheHasFloatsOrFlowThreads = false)
{
m_block = block;
m_hasFloatsOrFlowThreads = parentCacheHasFloatsOrFlowThreads || m_hasFloatsOrFlowThreads || m_block->containsFloats() || m_block->flowThreadContainingBlock();
m_cache = cache;
m_cachedLogicalLeftSelectionOffset = false;
m_cachedLogicalRightSelectionOffset = false;
}
LayoutUnit logicalLeftSelectionOffset(RenderBlock& rootBlock, LayoutUnit position) const
{
ASSERT(m_cache);
if (m_hasFloatsOrFlowThreads || !m_cachedLogicalLeftSelectionOffset) {
m_cachedLogicalLeftSelectionOffset = true;
m_logicalLeftSelectionOffset = m_block->logicalLeftSelectionOffset(rootBlock, position, *m_cache);
} else
ASSERT(m_logicalLeftSelectionOffset == m_block->logicalLeftSelectionOffset(rootBlock, position, *m_cache));
return m_logicalLeftSelectionOffset;
}
LayoutUnit logicalRightSelectionOffset(RenderBlock& rootBlock, LayoutUnit position) const
{
ASSERT(m_cache);
if (m_hasFloatsOrFlowThreads || !m_cachedLogicalRightSelectionOffset) {
m_cachedLogicalRightSelectionOffset = true;
m_logicalRightSelectionOffset = m_block->logicalRightSelectionOffset(rootBlock, position, *m_cache);
} else
ASSERT(m_logicalRightSelectionOffset == m_block->logicalRightSelectionOffset(rootBlock, position, *m_cache));
return m_logicalRightSelectionOffset;
}
RenderBlock* block() const { return m_block; }
const LogicalSelectionOffsetCaches* cache() const { return m_cache; }
bool hasFloatsOrFlowThreads() const { return m_hasFloatsOrFlowThreads; }
private:
RenderBlock* m_block { nullptr };
const LogicalSelectionOffsetCaches* m_cache { nullptr };
bool m_hasFloatsOrFlowThreads : 1;
mutable bool m_cachedLogicalLeftSelectionOffset : 1;
mutable bool m_cachedLogicalRightSelectionOffset : 1;
mutable LayoutUnit m_logicalLeftSelectionOffset;
mutable LayoutUnit m_logicalRightSelectionOffset;
};
explicit LogicalSelectionOffsetCaches(RenderBlock& rootBlock)
{
#if ENABLE(TEXT_SELECTION)
// FIXME: We should either move this assertion to the caller (if applicable) or structure the code
// such that we can remove this assertion.
ASSERT(rootBlock.isSelectionRoot());
#endif
auto parent = rootBlock.parent();
// LogicalSelectionOffsetCaches should not be used on an orphaned tree.
m_containingBlockForFixedPosition.setBlock(containingBlockForFixedPosition(parent), nullptr);
m_containingBlockForAbsolutePosition.setBlock(containingBlockForAbsolutePosition(parent), nullptr);
m_containingBlockForInflowPosition.setBlock(containingBlockForObjectInFlow(parent), nullptr);
}
LogicalSelectionOffsetCaches(RenderBlock& block, const LogicalSelectionOffsetCaches& cache)
: m_containingBlockForFixedPosition(cache.m_containingBlockForFixedPosition)
, m_containingBlockForAbsolutePosition(cache.m_containingBlockForAbsolutePosition)
{
if (block.canContainFixedPositionObjects())
m_containingBlockForFixedPosition.setBlock(&block, &cache, cache.m_containingBlockForFixedPosition.hasFloatsOrFlowThreads());
if (block.canContainAbsolutelyPositionedObjects() && !block.isRenderInline() && !block.isAnonymousBlock())
m_containingBlockForAbsolutePosition.setBlock(&block, &cache, cache.m_containingBlockForAbsolutePosition.hasFloatsOrFlowThreads());
m_containingBlockForInflowPosition.setBlock(&block, &cache, cache.m_containingBlockForInflowPosition.hasFloatsOrFlowThreads());
}
const ContainingBlockInfo& containingBlockInfo(RenderBlock& block) const
{
EPosition position = block.style().position();
if (position == FixedPosition) {
ASSERT(block.containingBlock() == m_containingBlockForFixedPosition.block());
return m_containingBlockForFixedPosition;
}
if (position == AbsolutePosition) {
ASSERT(block.containingBlock() == m_containingBlockForAbsolutePosition.block());
return m_containingBlockForAbsolutePosition;
}
ASSERT(block.containingBlock() == m_containingBlockForInflowPosition.block());
return m_containingBlockForInflowPosition;
}
private:
ContainingBlockInfo m_containingBlockForFixedPosition;
ContainingBlockInfo m_containingBlockForAbsolutePosition;
ContainingBlockInfo m_containingBlockForInflowPosition;
};
} // namespace WebCore
#endif // LogicalSelectionOffsetCaches_h
|
