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
|
/*
* Copyright (C) 2023 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 "FormattingConstraints.h"
#include "InlineFormattingContext.h"
#include "InlineFormattingUtils.h"
#include "InlineItem.h"
#include "InlineLineBuilder.h"
#include "InlineTextItem.h"
#include <optional>
namespace WebCore {
namespace Layout {
class InlineContentConstrainer {
public:
InlineContentConstrainer(InlineFormattingContext&, const InlineItemList&, const HorizontalConstraints&);
std::optional<Vector<LayoutUnit>> computeParagraphLevelConstraints(TextWrapStyle);
private:
friend struct SlidingWidth;
struct EntryBalance {
float accumulatedCost { std::numeric_limits<float>::infinity() };
size_t previousBreakIndex { 0 };
};
struct EntryPretty {
float accumulatedCost { std::numeric_limits<float>::infinity() };
size_t previousBreakIndex { 0 };
size_t lineIndex { 0 };
InlineLayoutUnit lastLineWidth { 0 };
InlineItemPosition lineEnd { };
std::optional<PreviousLine> previousLine { };
};
void initialize();
void updateCachedWidths();
void checkCanConstrainInlineItems();
EntryPretty layoutSingleLineForPretty(InlineItemRange layoutRange, InlineLayoutUnit idealLineWidth, EntryPretty lastValidEntry);
std::optional<Vector<LayoutUnit>> balanceRangeWithLineRequirement(InlineItemRange, InlineLayoutUnit idealLineWidth, size_t numberOfLines, bool isFirstChunk);
std::optional<Vector<LayoutUnit>> balanceRangeWithNoLineRequirement(InlineItemRange, InlineLayoutUnit idealLineWidth, bool isFirstChunk);
std::optional<Vector<LayoutUnit>> prettifyRange(InlineItemRange, InlineLayoutUnit idealLineWidth, bool isFirstChunk);
InlineLayoutUnit inlineItemWidth(size_t inlineItemIndex, bool useFirstLineStyle) const;
bool shouldTrimLeading(size_t inlineItemIndex, bool useFirstLineStyle, bool isFirstLineInChunk) const;
bool shouldTrimTrailing(size_t inlineItemIndex, bool useFirstLineStyle) const;
Vector<size_t> computeBreakOpportunities(InlineItemRange) const;
Vector<LayoutUnit> computeLineWidthsFromBreaks(InlineItemRange, const Vector<size_t>& breaks, bool isFirstChunk) const;
InlineLayoutUnit computeTextIndent(std::optional<bool> previousLineEndsWithLineBreak) const;
InlineFormattingContext& m_inlineFormattingContext;
const InlineItemList& m_inlineItemList;
const HorizontalConstraints& m_horizontalConstraints;
Vector<InlineItemRange> m_originalLineInlineItemRanges;
Vector<LayoutUnit> m_originalLineConstraints;
LayoutUnit m_maximumLineWidthConstraint { 0 };
Vector<bool> m_originalLineEndsWithForcedBreak;
Vector<InlineLayoutUnit> m_inlineItemWidths;
Vector<InlineLayoutUnit> m_firstLineStyleInlineItemWidths;
size_t m_numberOfLinesInOriginalLayout { 0 };
size_t m_numberOfInlineItems { 0 };
bool m_cannotConstrainContent { false };
bool m_hasSingleLineVisibleContent { false };
bool m_hasValidInlineItemWidthCache { false };
};
struct SlidingWidth {
SlidingWidth(const InlineContentConstrainer&, const InlineItemList&, size_t start, size_t end, bool useFirstLineStyle, bool isFirstLineInChunk);
InlineLayoutUnit width();
void advanceStart();
void advanceStartTo(size_t newStart);
void advanceEnd();
void advanceEndTo(size_t newEnd);
private:
const InlineContentConstrainer& m_inlineContentConstrainer;
#if ASSERT_ENABLED
const InlineItemList& m_inlineItemList;
#endif
size_t m_start { 0 };
size_t m_end { 0 };
bool m_useFirstLineStyle { false };
bool m_isFirstLineInChunk { false };
InlineLayoutUnit m_totalWidth { 0 };
InlineLayoutUnit m_leadingTrimmableWidth { 0 };
InlineLayoutUnit m_trailingTrimmableWidth { 0 };
std::optional<size_t> m_firstLeadingNonTrimmedItem;
};
}
}
|
