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) 2022 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. AND ITS CONTRIBUTORS ``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 ITS 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.
*/
#pragma once
#include <WebCore/Font.h>
#include <WebCore/PlacedFloats.h>
#include <WebCore/StyleTextBoxEdge.h>
#include <algorithm>
namespace WebCore {
namespace Layout {
class BlockFormattingContext;
// This class holds block level information shared across child inline formatting contexts.
class BlockLayoutState {
public:
struct LineClamp {
size_t maximumLines { 0 };
bool shouldDiscardOverflow { false };
bool isLegacy { true };
};
enum class TextBoxTrimSide : uint8_t {
Start = 1 << 0,
End = 1 << 1
};
using TextBoxTrim = OptionSet<TextBoxTrimSide>;
struct LineGrid {
LayoutSize layoutOffset;
LayoutSize gridOffset;
InlineLayoutUnit columnWidth;
LayoutUnit rowHeight;
LayoutUnit topRowOffset;
Ref<const Font> primaryFont;
std::optional<LayoutSize> paginationOrigin;
LayoutUnit pageLogicalTop;
};
struct MarginState {
void resetBeforeSideOfBlock()
{
ASSERT(atBeforeSideOfBlock);
atBeforeSideOfBlock = { };
}
void resetMarginValues()
{
positiveMargin = { };
negativeMargin = { };
contentOffsetAfterSelfCollapsingBlock = { };
}
LayoutUnit margin() const { return positiveMargin - negativeMargin; }
// FIXME: This tracks RenderBlockFlow's MarginInfo for now.
bool canCollapseWithChildren : 1 { false };
bool canCollapseMarginBeforeWithChildren : 1 { false };
bool canCollapseMarginAfterWithChildren : 1 { false };
bool quirkContainer : 1 { false };
bool atBeforeSideOfBlock : 1 { true };
bool atAfterSideOfBlock : 1 { false };
bool hasMarginBeforeQuirk : 1 { false };
bool hasMarginAfterQuirk : 1 { false };
bool determinedMarginBeforeQuirk : 1 { false };
LayoutUnit positiveMargin;
LayoutUnit negativeMargin;
// This tracks the offset initiated by a self collapsing block when "next line top position" diverges from "current line's bottom".
// See the last paragraph at https://www.w3.org/TR/CSS22/box.html#collapsing-margins
LayoutUnit contentOffsetAfterSelfCollapsingBlock;
};
BlockLayoutState(PlacedFloats&, MarginState, std::optional<LineClamp> = { }, TextBoxTrim = { }, Style::TextBoxEdge = CSS::Keyword::Auto { }, std::optional<LayoutUnit> intrusiveInitialLetterLogicalBottom = { }, std::optional<LineGrid> lineGrid = { });
PlacedFloats& placedFloats() { return m_placedFloats; }
const PlacedFloats& placedFloats() const { return m_placedFloats; }
std::optional<LineClamp> lineClamp() const { return m_lineClamp; }
TextBoxTrim textBoxTrim() const { return m_textBoxTrim; }
Style::TextBoxEdge textBoxEdge() const { return m_textBoxEdge; }
std::optional<LayoutUnit> intrusiveInitialLetterLogicalBottom() const { return m_intrusiveInitialLetterLogicalBottom; }
const std::optional<LineGrid>& lineGrid() const { return m_lineGrid; }
MarginState& marginState() { return m_marginState; }
const MarginState& marginState() const { return m_marginState; }
private:
PlacedFloats& m_placedFloats;
std::optional<LineClamp> m_lineClamp;
TextBoxTrim m_textBoxTrim;
Style::TextBoxEdge m_textBoxEdge;
std::optional<LayoutUnit> m_intrusiveInitialLetterLogicalBottom;
std::optional<LineGrid> m_lineGrid;
MarginState m_marginState;
};
inline BlockLayoutState::BlockLayoutState(PlacedFloats& placedFloats, MarginState marginState, std::optional<LineClamp> lineClamp, TextBoxTrim textBoxTrim, Style::TextBoxEdge textBoxEdge, std::optional<LayoutUnit> intrusiveInitialLetterLogicalBottom, std::optional<LineGrid> lineGrid)
: m_placedFloats(placedFloats)
, m_lineClamp(lineClamp)
, m_textBoxTrim(textBoxTrim)
, m_textBoxEdge(textBoxEdge)
, m_intrusiveInitialLetterLogicalBottom(intrusiveInitialLetterLogicalBottom)
, m_lineGrid(lineGrid)
, m_marginState(marginState)
{
}
}
}
|
