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
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
|
/*
* Copyright (C) 2020 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.
*/
#include "config.h"
#include "FlexFormattingContext.h"
#include "FlexFormattingGeometry.h"
#include "FlexFormattingState.h"
#include "FlexRect.h"
#include "InlineRect.h"
#include "LayoutBoxGeometry.h"
#include "LayoutChildIterator.h"
#include "LayoutContext.h"
#include "LengthFunctions.h"
#include "RenderStyleInlines.h"
#include <wtf/FixedVector.h>
#include <wtf/IsoMallocInlines.h>
namespace WebCore {
namespace Layout {
WTF_MAKE_ISO_ALLOCATED_IMPL(FlexFormattingContext);
FlexFormattingContext::FlexFormattingContext(const ElementBox& formattingContextRoot, FlexFormattingState& formattingState)
: FormattingContext(formattingContextRoot, formattingState)
, m_flexFormattingGeometry(*this)
, m_flexFormattingQuirks(*this)
{
}
void FlexFormattingContext::layout(const ConstraintsForFlexContent& constraints)
{
auto logicalFlexItems = convertFlexItemsToLogicalSpace(constraints);
auto flexLayout = FlexLayout { *this };
auto logicalFlexConstraints = [&] {
auto flexDirection = root().style().flexDirection();
auto flexDirectionIsInlineAxis = flexDirection == FlexDirection::Row || flexDirection == FlexDirection::RowReverse;
auto logicalVerticalSpace = flexDirectionIsInlineAxis ? constraints.availableVerticalSpace() : std::make_optional(constraints.horizontal().logicalWidth);
auto logicalHorizontalSpace = flexDirectionIsInlineAxis ? std::make_optional(constraints.horizontal().logicalWidth) : constraints.availableVerticalSpace();
return FlexLayout::LogicalConstraints { { logicalHorizontalSpace, { }, { }, { }, { }, { } }, { logicalVerticalSpace, { }, { }, { }, { }, { } } };
};
auto flexItemRects = flexLayout.layout(logicalFlexConstraints(), logicalFlexItems);
setFlexItemsGeometry(logicalFlexItems, flexItemRects, constraints);
}
IntrinsicWidthConstraints FlexFormattingContext::computedIntrinsicWidthConstraints()
{
return { };
}
FlexLayout::LogicalFlexItems FlexFormattingContext::convertFlexItemsToLogicalSpace(const ConstraintsForFlexContent& constraints)
{
struct FlexItem {
LogicalFlexItem::MainAxisGeometry mainAxis;
LogicalFlexItem::CrossAxisGeometry crossAxis;
int logicalOrder { 0 };
CheckedPtr<const ElementBox> layoutBox;
};
Vector<FlexItem> flexItemList;
auto flexItemsNeedReordering = false;
auto& formattingState = this->formattingState();
auto convertVisualToLogical = [&] {
auto direction = root().style().flexDirection();
auto previousLogicalOrder = std::optional<int> { };
for (auto* flexItem = root().firstInFlowChild(); flexItem; flexItem = flexItem->nextInFlowSibling()) {
auto& flexItemGeometry = formattingState.boxGeometry(*flexItem);
auto& style = flexItem->style();
auto mainAxis = LogicalFlexItem::MainAxisGeometry { };
auto crossAxis = LogicalFlexItem::CrossAxisGeometry { };
switch (direction) {
case FlexDirection::Row:
case FlexDirection::RowReverse: {
if (style.flexBasis().isAuto()) {
// Auto keyword retrieves the value of the main size property as the used flex-basis.
// If that value is itself auto, then the used value is content.
if (!style.width().isAuto())
mainAxis.definiteFlexBasis = valueForLength(style.width(), constraints.horizontal().logicalWidth);
} else if (!style.flexBasis().isContent())
mainAxis.definiteFlexBasis = valueForLength(style.flexBasis(), constraints.horizontal().logicalWidth);
if (style.width().isSpecified()) {
// FIXME: Add support for non-fixed content and clamp them to min/max.
mainAxis.minimumUsedSize = valueForLength(style.width(), constraints.horizontal().logicalWidth);
mainAxis.maximumUsedSize = mainAxis.minimumUsedSize;
}
if (!style.marginStart().isAuto())
mainAxis.marginStart = flexItemGeometry.marginStart();
if (!style.marginEnd().isAuto())
mainAxis.marginEnd = flexItemGeometry.marginEnd();
mainAxis.borderAndPadding = flexItemGeometry.horizontalBorderAndPadding();
if (!style.marginBefore().isAuto())
crossAxis.marginStart = flexItemGeometry.marginBefore();
if (!style.marginAfter().isAuto())
crossAxis.marginEnd = flexItemGeometry.marginAfter();
auto& height = style.height();
crossAxis.hasSizeAuto = height.isAuto();
if (height.isFixed())
crossAxis.definiteSize = height.value();
if (style.maxHeight().isSpecified())
crossAxis.maximumSize = valueForLength(style.maxHeight(), constraints.availableVerticalSpace().value_or(0));
if (style.minHeight().isSpecified())
crossAxis.minimumSize = valueForLength(style.minHeight(), constraints.availableVerticalSpace().value_or(0));
crossAxis.borderAndPadding = flexItemGeometry.verticalBorderAndPadding();
break;
}
case FlexDirection::Column:
case FlexDirection::ColumnReverse: {
break;
}
default:
ASSERT_NOT_REACHED();
break;
}
auto flexItemOrder = style.order();
flexItemsNeedReordering = flexItemsNeedReordering || flexItemOrder != previousLogicalOrder.value_or(0);
previousLogicalOrder = flexItemOrder;
flexItemList.append({ mainAxis, crossAxis, flexItemOrder, downcast<ElementBox>(flexItem) });
}
};
convertVisualToLogical();
auto reorderFlexItemsIfApplicable = [&] {
if (!flexItemsNeedReordering)
return;
std::stable_sort(flexItemList.begin(), flexItemList.end(), [&] (auto& a, auto& b) {
return a.logicalOrder < b.logicalOrder;
});
};
reorderFlexItemsIfApplicable();
auto logicalFlexItemList = FlexLayout::LogicalFlexItems(flexItemList.size());
for (size_t index = 0; index < flexItemList.size(); ++index) {
auto& flexItem = flexItemList[index];
logicalFlexItemList[index] = { *flexItem.layoutBox
, flexItem.mainAxis
, flexItem.crossAxis
, false
, false
};
}
return logicalFlexItemList;
}
void FlexFormattingContext::setFlexItemsGeometry(const FlexLayout::LogicalFlexItems& logicalFlexItemList, const FlexLayout::LogicalFlexItemRects& logicalRects, const ConstraintsForFlexContent& constraints)
{
auto& formattingState = this->formattingState();
auto logicalWidth = logicalRects.last().right() - logicalRects.first().left();
auto& flexBoxStyle = root().style();
auto flexDirection = flexBoxStyle.flexDirection();
auto isMainAxisParallelWithInlineAxis = FlexFormattingGeometry::isMainAxisParallelWithInlineAxis(root());
auto flexBoxLogicalHeightForWarpReserve = [&]() -> std::optional<LayoutUnit> {
if (flexBoxStyle.flexWrap() != FlexWrap::Reverse)
return { };
if (!isMainAxisParallelWithInlineAxis) {
// We always have a valid horizontal constraint for column logical height.
return constraints.horizontal().logicalWidth;
}
// Let's use the bottom of the content if flex box does not have a definite height.
return constraints.availableVerticalSpace().value_or(logicalRects.last().bottom());
}();
for (size_t index = 0; index < logicalFlexItemList.size(); ++index) {
auto& logicalFlexItem = logicalFlexItemList[index];
auto& flexItemGeometry = formattingState.boxGeometry(logicalFlexItem.layoutBox());
auto borderBoxTopLeft = LayoutPoint { };
auto logicalRect = logicalRects[index];
auto adjustedLogicalTop = !flexBoxLogicalHeightForWarpReserve ? logicalRect.top() : *flexBoxLogicalHeightForWarpReserve - logicalRect.bottom();
switch (flexDirection) {
case FlexDirection::Row: {
borderBoxTopLeft = { constraints.horizontal().logicalLeft + logicalRect.left(), constraints.logicalTop() + adjustedLogicalTop };
break;
}
case FlexDirection::RowReverse:
borderBoxTopLeft = { constraints.horizontal().logicalRight() - logicalRect.right(), constraints.logicalTop() + adjustedLogicalTop };
break;
case FlexDirection::Column: {
auto flippedTopLeft = FloatPoint { adjustedLogicalTop, logicalRect.left() };
borderBoxTopLeft = { constraints.horizontal().logicalLeft + flippedTopLeft.x(), constraints.logicalTop() + flippedTopLeft.y() };
break;
}
case FlexDirection::ColumnReverse: {
auto visualBottom = constraints.logicalTop() + constraints.availableVerticalSpace().value_or(logicalWidth);
borderBoxTopLeft = { constraints.horizontal().logicalLeft + adjustedLogicalTop, visualBottom - logicalRect.right() };
break;
}
default:
ASSERT_NOT_REACHED();
break;
}
flexItemGeometry.setLogicalTopLeft(borderBoxTopLeft);
auto contentBoxWidth = isMainAxisParallelWithInlineAxis ? logicalRect.width() : logicalRect.height();
auto contentBoxHeight = isMainAxisParallelWithInlineAxis ? logicalRect.height() : logicalRect.width();
if (!logicalFlexItem.isContentBoxBased()) {
contentBoxWidth -= flexItemGeometry.horizontalBorderAndPadding();
contentBoxHeight -= flexItemGeometry.verticalBorderAndPadding();
}
flexItemGeometry.setContentBoxWidth(contentBoxWidth);
flexItemGeometry.setContentBoxHeight(contentBoxHeight);
}
}
}
}
|
