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
|
/*
* Copyright (C) 2007 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.
*/
#include "core/layout/LayoutState.h"
#include "core/layout/LayoutFlowThread.h"
#include "core/layout/LayoutInline.h"
#include "core/layout/LayoutView.h"
namespace blink {
LayoutState::LayoutState(LayoutView& view)
: m_isPaginated(view.pageLogicalHeight()),
m_containingBlockLogicalWidthChanged(false),
m_paginationStateChanged(false),
m_flowThread(nullptr),
m_next(nullptr),
m_layoutObject(view) {
ASSERT(!view.layoutState());
view.pushLayoutState(*this);
}
LayoutState::LayoutState(LayoutBox& layoutObject,
bool containingBlockLogicalWidthChanged)
: m_containingBlockLogicalWidthChanged(containingBlockLogicalWidthChanged),
m_next(layoutObject.view()->layoutState()),
m_layoutObject(layoutObject) {
if (layoutObject.isLayoutFlowThread())
m_flowThread = toLayoutFlowThread(&layoutObject);
else
m_flowThread = m_next->flowThread();
m_paginationStateChanged = m_next->m_paginationStateChanged;
layoutObject.view()->pushLayoutState(*this);
if (layoutObject.isLayoutFlowThread()) {
// Entering a new pagination context.
m_paginationOffset = LayoutSize();
m_isPaginated = true;
return;
}
// Disable pagination for objects we don't support. For now this includes
// overflow:scroll/auto, inline blocks and writing mode roots. Additionally,
// pagination inside SVG is not allowed.
if (layoutObject.getPaginationBreakability() == LayoutBox::ForbidBreaks ||
m_layoutObject.isSVGChild()) {
m_flowThread = nullptr;
m_isPaginated = false;
return;
}
m_isPaginated = m_next->m_isPaginated;
if (!m_isPaginated)
return;
// Now adjust the pagination offset, so that we can easily figure out how far
// away we are from the start of the pagination context.
m_paginationOffset = m_next->m_paginationOffset;
bool fixed = layoutObject.isOutOfFlowPositioned() &&
layoutObject.style()->position() == FixedPosition;
if (fixed)
return;
m_paginationOffset =
m_next->m_paginationOffset + layoutObject.locationOffset();
if (!layoutObject.isOutOfFlowPositioned())
return;
if (LayoutObject* container = layoutObject.container()) {
if (container->style()->hasInFlowPosition() &&
container->isLayoutInline()) {
m_paginationOffset +=
toLayoutInline(container)->offsetForInFlowPositionedInline(
layoutObject);
}
}
// FIXME: <http://bugs.webkit.org/show_bug.cgi?id=13443> Apply control clip if
// present.
}
LayoutState::LayoutState(LayoutObject& root)
: m_isPaginated(false),
m_containingBlockLogicalWidthChanged(false),
m_paginationStateChanged(false),
m_flowThread(nullptr),
m_next(root.view()->layoutState()),
m_layoutObject(root) {
ASSERT(!m_next);
// We'll end up pushing in LayoutView itself, so don't bother adding it.
if (root.isLayoutView())
return;
root.view()->pushLayoutState(*this);
}
LayoutState::~LayoutState() {
if (m_layoutObject.view()->layoutState()) {
ASSERT(m_layoutObject.view()->layoutState() == this);
m_layoutObject.view()->popLayoutState();
}
}
LayoutUnit LayoutState::pageLogicalOffset(
const LayoutBox& child,
const LayoutUnit& childLogicalOffset) const {
if (child.isHorizontalWritingMode())
return m_paginationOffset.height() + childLogicalOffset;
return m_paginationOffset.width() + childLogicalOffset;
}
} // namespace blink
|
