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1 // Copyright 2016 The Chromium Authors. All rights reserved. | 1 // Copyright 2016 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "core/layout/ng/ng_absolute_utils.h" | 5 #include "core/layout/ng/ng_absolute_utils.h" |
6 | 6 |
7 #include "core/layout/ng/ng_constraint_space.h" | 7 #include "core/layout/ng/ng_constraint_space.h" |
8 #include "core/layout/ng/ng_length_utils.h" | 8 #include "core/layout/ng/ng_length_utils.h" |
9 #include "core/style/ComputedStyle.h" | 9 #include "core/style/ComputedStyle.h" |
10 #include "platform/LengthFunctions.h" | 10 #include "platform/LengthFunctions.h" |
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77 // left + marginLeft + width + marginRight + right = container width | 77 // left + marginLeft + width + marginRight + right = container width |
78 if (left == NGSizeIndefinite && right == NGSizeIndefinite && | 78 if (left == NGSizeIndefinite && right == NGSizeIndefinite && |
79 width == NGSizeIndefinite) { | 79 width == NGSizeIndefinite) { |
80 // Standard: "If all three of left, width, and right are auto:" | 80 // Standard: "If all three of left, width, and right are auto:" |
81 if (margin_left == NGSizeIndefinite) | 81 if (margin_left == NGSizeIndefinite) |
82 margin_left = LayoutUnit(); | 82 margin_left = LayoutUnit(); |
83 if (margin_right == NGSizeIndefinite) | 83 if (margin_right == NGSizeIndefinite) |
84 margin_right = LayoutUnit(); | 84 margin_right = LayoutUnit(); |
85 DCHECK(child_auto_width.has_value()); | 85 DCHECK(child_auto_width.has_value()); |
86 width = *child_auto_width; | 86 width = *child_auto_width; |
87 if (space.Direction() == LTR) { | 87 if (space.Direction() == TextDirection::Ltr) { |
88 left = static_position.LeftPosition(container_size.width, width, | 88 left = static_position.LeftPosition(container_size.width, width, |
89 margin_left, margin_right); | 89 margin_left, margin_right); |
90 } else { | 90 } else { |
91 right = static_position.RightPosition(container_size.width, width, | 91 right = static_position.RightPosition(container_size.width, width, |
92 margin_left, margin_right); | 92 margin_left, margin_right); |
93 } | 93 } |
94 } else if (left != NGSizeIndefinite && right != NGSizeIndefinite && | 94 } else if (left != NGSizeIndefinite && right != NGSizeIndefinite && |
95 width != NGSizeIndefinite) { | 95 width != NGSizeIndefinite) { |
96 // Standard: "If left, right, and width are not auto:" | 96 // Standard: "If left, right, and width are not auto:" |
97 // Compute margins. | 97 // Compute margins. |
98 LayoutUnit margin_space = container_size.width - left - right - width; | 98 LayoutUnit margin_space = container_size.width - left - right - width; |
99 // When both margins are auto. | 99 // When both margins are auto. |
100 if (margin_left == NGSizeIndefinite && margin_right == NGSizeIndefinite) { | 100 if (margin_left == NGSizeIndefinite && margin_right == NGSizeIndefinite) { |
101 if (margin_space > 0) { | 101 if (margin_space > 0) { |
102 margin_left = margin_space / 2; | 102 margin_left = margin_space / 2; |
103 margin_right = margin_space / 2; | 103 margin_right = margin_space / 2; |
104 } else { | 104 } else { |
105 // Margins are negative. | 105 // Margins are negative. |
106 if (space.Direction() == LTR) { | 106 if (space.Direction() == TextDirection::Ltr) { |
107 margin_left = LayoutUnit(); | 107 margin_left = LayoutUnit(); |
108 margin_right = margin_space; | 108 margin_right = margin_space; |
109 } else { | 109 } else { |
110 margin_right = LayoutUnit(); | 110 margin_right = LayoutUnit(); |
111 margin_left = margin_space; | 111 margin_left = margin_space; |
112 } | 112 } |
113 } | 113 } |
114 } else if (margin_left == NGSizeIndefinite) { | 114 } else if (margin_left == NGSizeIndefinite) { |
115 margin_left = margin_space; | 115 margin_left = margin_space; |
116 } else if (margin_right == NGSizeIndefinite) { | 116 } else if (margin_right == NGSizeIndefinite) { |
117 margin_right = margin_space; | 117 margin_right = margin_space; |
118 } else { | 118 } else { |
119 // Are values overconstrained? | 119 // Are values overconstrained? |
120 if (margin_left + margin_right != margin_space) { | 120 if (margin_left + margin_right != margin_space) { |
121 // Relax the end. | 121 // Relax the end. |
122 if (space.Direction() == LTR) | 122 if (space.Direction() == TextDirection::Ltr) |
123 right -= margin_left + margin_right - margin_space; | 123 right -= margin_left + margin_right - margin_space; |
124 else | 124 else |
125 left -= margin_left + margin_right - margin_space; | 125 left -= margin_left + margin_right - margin_space; |
126 } | 126 } |
127 } | 127 } |
128 } | 128 } |
129 | 129 |
130 // Set unknown margins. | 130 // Set unknown margins. |
131 if (margin_left == NGSizeIndefinite) | 131 if (margin_left == NGSizeIndefinite) |
132 margin_left = LayoutUnit(); | 132 margin_left = LayoutUnit(); |
133 if (margin_right == NGSizeIndefinite) | 133 if (margin_right == NGSizeIndefinite) |
134 margin_right = LayoutUnit(); | 134 margin_right = LayoutUnit(); |
135 | 135 |
136 // Rules 1 through 3, 2 out of 3 are unknown. | 136 // Rules 1 through 3, 2 out of 3 are unknown. |
137 if (left == NGSizeIndefinite && width == NGSizeIndefinite) { | 137 if (left == NGSizeIndefinite && width == NGSizeIndefinite) { |
138 // Rule 1: left/width are unknown. | 138 // Rule 1: left/width are unknown. |
139 DCHECK_NE(right, NGSizeIndefinite); | 139 DCHECK_NE(right, NGSizeIndefinite); |
140 DCHECK(child_auto_width.has_value()); | 140 DCHECK(child_auto_width.has_value()); |
141 width = *child_auto_width; | 141 width = *child_auto_width; |
142 } else if (left == NGSizeIndefinite && right == NGSizeIndefinite) { | 142 } else if (left == NGSizeIndefinite && right == NGSizeIndefinite) { |
143 // Rule 2. | 143 // Rule 2. |
144 DCHECK_NE(width, NGSizeIndefinite); | 144 DCHECK_NE(width, NGSizeIndefinite); |
145 if (space.Direction() == LTR) | 145 if (space.Direction() == TextDirection::Ltr) |
146 left = static_position.LeftPosition(container_size.width, width, | 146 left = static_position.LeftPosition(container_size.width, width, |
147 margin_left, margin_right); | 147 margin_left, margin_right); |
148 else | 148 else |
149 right = static_position.RightPosition(container_size.width, width, | 149 right = static_position.RightPosition(container_size.width, width, |
150 margin_left, margin_right); | 150 margin_left, margin_right); |
151 } else if (width == NGSizeIndefinite && right == NGSizeIndefinite) { | 151 } else if (width == NGSizeIndefinite && right == NGSizeIndefinite) { |
152 // Rule 3. | 152 // Rule 3. |
153 DCHECK(child_auto_width.has_value()); | 153 DCHECK(child_auto_width.has_value()); |
154 width = *child_auto_width; | 154 width = *child_auto_width; |
155 } | 155 } |
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342 NGAbsolutePhysicalPosition* position) { | 342 NGAbsolutePhysicalPosition* position) { |
343 if (style.isHorizontalWritingMode()) | 343 if (style.isHorizontalWritingMode()) |
344 ComputeAbsoluteVertical(space, style, static_position, child_block_size, | 344 ComputeAbsoluteVertical(space, style, static_position, child_block_size, |
345 position); | 345 position); |
346 else | 346 else |
347 ComputeAbsoluteHorizontal(space, style, static_position, child_block_size, | 347 ComputeAbsoluteHorizontal(space, style, static_position, child_block_size, |
348 position); | 348 position); |
349 } | 349 } |
350 | 350 |
351 } // namespace blink | 351 } // namespace blink |
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