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
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
|
/*
* Copyright (C) 2017 Igalia S.L.
*
* 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 "config.h"
#include "GridLayoutFunctions.h"
#include "LengthFunctions.h"
#include "RenderBoxInlines.h"
#include "RenderBoxModelObjectInlines.h"
#include "RenderGrid.h"
#include "RenderStyleInlines.h"
namespace WebCore {
namespace GridLayoutFunctions {
static inline bool marginStartIsAuto(const RenderBox& child, GridTrackSizingDirection direction)
{
return direction == ForColumns ? child.style().marginStart().isAuto() : child.style().marginBefore().isAuto();
}
static inline bool marginEndIsAuto(const RenderBox& child, GridTrackSizingDirection direction)
{
return direction == ForColumns ? child.style().marginEnd().isAuto() : child.style().marginAfter().isAuto();
}
static bool childHasMargin(const RenderBox& child, GridTrackSizingDirection direction)
{
// Length::IsZero returns true for 'auto' margins, which is aligned with the purpose of this function.
if (direction == ForColumns)
return !child.style().marginStart().isZero() || !child.style().marginEnd().isZero();
return !child.style().marginBefore().isZero() || !child.style().marginAfter().isZero();
}
LayoutUnit computeMarginLogicalSizeForChild(const RenderGrid& grid, GridTrackSizingDirection direction, const RenderBox& child)
{
GridTrackSizingDirection flowAwareDirection = flowAwareDirectionForChild(grid, child, direction);
if (!childHasMargin(child, flowAwareDirection))
return 0;
LayoutUnit marginStart;
LayoutUnit marginEnd;
if (direction == ForColumns)
child.computeInlineDirectionMargins(grid, child.containingBlockLogicalWidthForContentInFragment(nullptr), { }, child.logicalWidth(), marginStart, marginEnd);
else
child.computeBlockDirectionMargins(grid, marginStart, marginEnd);
return marginStartIsAuto(child, flowAwareDirection) ? marginEnd : marginEndIsAuto(child, flowAwareDirection) ? marginStart : marginStart + marginEnd;
}
static bool hasRelativeOrIntrinsicSizeForChild(const RenderBox& child, GridTrackSizingDirection direction)
{
if (direction == ForColumns)
return child.hasRelativeLogicalWidth() || child.style().logicalWidth().isIntrinsicOrAuto();
return child.hasRelativeLogicalHeight() || child.style().logicalHeight().isIntrinsicOrAuto();
}
static LayoutUnit extraMarginForSubgrid(const RenderGrid& parent, unsigned startLine, unsigned endLine, GridTrackSizingDirection direction)
{
unsigned numTracks = parent.numTracks(direction);
if (!numTracks || !parent.isSubgrid(direction))
return 0_lu;
std::optional<LayoutUnit> availableSpace;
if (!hasRelativeOrIntrinsicSizeForChild(parent, direction))
availableSpace = parent.availableSpaceForGutters(direction);
RenderGrid& grandParent = downcast<RenderGrid>(*parent.parent());
LayoutUnit mbp;
if (!startLine)
mbp += (direction == ForColumns) ? parent.marginAndBorderAndPaddingStart() : parent.marginAndBorderAndPaddingBefore();
else
mbp += (parent.gridGap(direction, availableSpace) - grandParent.gridGap(direction)) / 2;
if (endLine == numTracks)
mbp += (direction == ForColumns) ? parent.marginAndBorderAndPaddingEnd() : parent.marginAndBorderAndPaddingAfter();
else
mbp += (parent.gridGap(direction, availableSpace) - grandParent.gridGap(direction)) / 2;
return mbp;
}
LayoutUnit extraMarginForSubgridAncestors(GridTrackSizingDirection direction, const RenderBox& child)
{
const RenderGrid* grid = downcast<RenderGrid>(child.parent());
LayoutUnit mbp;
while (grid->isSubgrid(direction)) {
GridSpan span = grid->gridSpanForChild(child, direction);
mbp += extraMarginForSubgrid(*grid, span.startLine(), span.endLine(), direction);
const RenderElement* parent = grid->parent();
if (!parent || !is<RenderGrid>(parent))
break;
const RenderGrid* parentGrid = downcast<RenderGrid>(parent);
direction = flowAwareDirectionForParent(*grid, *parentGrid, direction);
grid = parentGrid;
}
return mbp;
}
LayoutUnit marginLogicalSizeForChild(const RenderGrid& grid, GridTrackSizingDirection direction, const RenderBox& child)
{
LayoutUnit margin;
if (child.needsLayout())
margin = computeMarginLogicalSizeForChild(grid, direction, child);
else {
GridTrackSizingDirection flowAwareDirection = flowAwareDirectionForChild(grid, child, direction);
bool isRowAxis = flowAwareDirection == ForColumns;
LayoutUnit marginStart = marginStartIsAuto(child, flowAwareDirection) ? 0_lu : isRowAxis ? child.marginStart() : child.marginBefore();
LayoutUnit marginEnd = marginEndIsAuto(child, flowAwareDirection) ? 0_lu : isRowAxis ? child.marginEnd() : child.marginAfter();
margin = marginStart + marginEnd;
}
if (&grid != child.parent()) {
GridTrackSizingDirection subgridDirection = flowAwareDirectionForChild(grid, *downcast<RenderGrid>(child.parent()), direction);
margin += extraMarginForSubgridAncestors(subgridDirection, child);
}
return margin;
}
bool isOrthogonalChild(const RenderGrid& grid, const RenderBox& child)
{
return child.isHorizontalWritingMode() != grid.isHorizontalWritingMode();
}
bool isOrthogonalParent(const RenderGrid& grid, const RenderElement& parent)
{
return parent.isHorizontalWritingMode() != grid.isHorizontalWritingMode();
}
bool isAspectRatioBlockSizeDependentChild(const RenderBox& child)
{
return (child.style().hasAspectRatio() || child.hasIntrinsicAspectRatio()) && (child.hasRelativeLogicalHeight() || child.hasStretchedLogicalHeight());
}
GridTrackSizingDirection flowAwareDirectionForChild(const RenderGrid& grid, const RenderBox& child, GridTrackSizingDirection direction)
{
return !isOrthogonalChild(grid, child) ? direction : (direction == ForColumns ? ForRows : ForColumns);
}
GridTrackSizingDirection flowAwareDirectionForParent(const RenderGrid& grid, const RenderElement& parent, GridTrackSizingDirection direction)
{
return isOrthogonalParent(grid, parent) ? (direction == ForColumns ? ForRows : ForColumns) : direction;
}
bool hasOverridingContainingBlockContentSizeForChild(const RenderBox& child, GridTrackSizingDirection direction)
{
return direction == ForColumns ? child.hasOverridingContainingBlockContentLogicalWidth() : child.hasOverridingContainingBlockContentLogicalHeight();
}
std::optional<LayoutUnit> overridingContainingBlockContentSizeForChild(const RenderBox& child, GridTrackSizingDirection direction)
{
return direction == ForColumns ? child.overridingContainingBlockContentLogicalWidth() : child.overridingContainingBlockContentLogicalHeight();
}
bool isFlippedDirection(const RenderGrid& grid, GridTrackSizingDirection direction)
{
if (direction == ForColumns)
return !grid.style().isLeftToRightDirection();
return grid.style().isFlippedBlocksWritingMode();
}
bool isSubgridReversedDirection(const RenderGrid& grid, GridTrackSizingDirection outerDirection, const RenderGrid& subgrid)
{
GridTrackSizingDirection childDirection = flowAwareDirectionForChild(grid, subgrid, outerDirection);
ASSERT(subgrid.isSubgrid(childDirection));
return isFlippedDirection(grid, outerDirection) != isFlippedDirection(subgrid, childDirection);
}
} // namespace GridLayoutFunctions
} // namespace WebCore
|
