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
|
/*
* Copyright (C) 2007, 2013 Apple Inc. 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 APPLE INC. ``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 APPLE INC. OR
* CONTRIBUTORS 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 LayoutState_h
#define LayoutState_h
#include "LayoutRect.h"
#include <wtf/HashMap.h>
#include <wtf/Noncopyable.h>
namespace WebCore {
class RenderBlock;
class RenderBlockFlow;
class RenderBox;
class RenderElement;
class RenderFlowThread;
class RenderObject;
class ShapeInsideInfo;
class LayoutState {
WTF_MAKE_NONCOPYABLE(LayoutState); WTF_MAKE_FAST_ALLOCATED;
public:
LayoutState()
: m_clipped(false)
, m_isPaginated(false)
, m_pageLogicalHeightChanged(false)
#if !ASSERT_DISABLED
, m_layoutDeltaXSaturated(false)
, m_layoutDeltaYSaturated(false)
#endif
{
}
LayoutState(std::unique_ptr<LayoutState>, RenderBox*, const LayoutSize& offset, LayoutUnit pageHeight, bool pageHeightChanged);
explicit LayoutState(RenderObject&);
void clearPaginationInformation();
bool isPaginated() const { return m_isPaginated; }
// The page logical offset is the object's offset from the top of the page in the page progression
// direction (so an x-offset in vertical text and a y-offset for horizontal text).
LayoutUnit pageLogicalOffset(RenderBox*, LayoutUnit childLogicalOffset) const;
LayoutUnit pageLogicalHeight() const { return m_pageLogicalHeight; }
bool pageLogicalHeightChanged() const { return m_pageLogicalHeightChanged; }
RenderBlockFlow* lineGrid() const { return m_lineGrid; }
LayoutSize lineGridOffset() const { return m_lineGridOffset; }
LayoutSize lineGridPaginationOrigin() const { return m_lineGridPaginationOrigin; }
LayoutSize layoutOffset() const { return m_layoutOffset; }
LayoutSize pageOffset() const { return m_pageOffset; }
void setLineGridPaginationOrigin(const LayoutSize& origin) { m_lineGridPaginationOrigin = origin; }
bool needsBlockDirectionLocationSetBeforeLayout() const { return m_lineGrid || (m_isPaginated && m_pageLogicalHeight); }
RenderFlowThread* currentRenderFlowThread() const { return m_currentRenderFlowThread; }
void setCurrentRenderFlowThread(RenderFlowThread* flowThread) { m_currentRenderFlowThread = flowThread; }
private:
void propagateLineGridInfo(RenderBox*);
void establishLineGrid(RenderBlockFlow*);
public:
// Do not add anything apart from bitfields. See https://bugs.webkit.org/show_bug.cgi?id=100173
bool m_clipped : 1;
bool m_isPaginated : 1;
// If our page height has changed, this will force all blocks to relayout.
bool m_pageLogicalHeightChanged : 1;
#if !ASSERT_DISABLED
bool m_layoutDeltaXSaturated : 1;
bool m_layoutDeltaYSaturated : 1;
#endif
// The current line grid that we're snapping to and the offset of the start of the grid.
RenderBlockFlow* m_lineGrid { nullptr };
std::unique_ptr<LayoutState> m_next;
// FIXME: Distinguish between the layout clip rect and the paint clip rect which may be larger,
// e.g., because of composited scrolling.
LayoutRect m_clipRect;
// x/y offset from container. Includes relative positioning and scroll offsets.
LayoutSize m_paintOffset;
// x/y offset from container. Does not include relative positioning or scroll offsets.
LayoutSize m_layoutOffset;
// Transient offset from the final position of the object
// used to ensure that repaints happen in the correct place.
// This is a total delta accumulated from the root.
LayoutSize m_layoutDelta;
// The current page height for the pagination model that encloses us.
LayoutUnit m_pageLogicalHeight;
// The offset of the start of the first page in the nearest enclosing pagination model.
LayoutSize m_pageOffset;
LayoutSize m_lineGridOffset;
LayoutSize m_lineGridPaginationOrigin;
RenderFlowThread* m_currentRenderFlowThread { nullptr };
#ifndef NDEBUG
RenderObject* m_renderer { nullptr };
#endif
};
} // namespace WebCore
#endif // LayoutState_h
|
