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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_block_layout_algorithm.h" | 5 #include "core/layout/ng/ng_block_layout_algorithm.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_fragment_builder.h" | 8 #include "core/layout/ng/ng_fragment_builder.h" |
9 #include "core/layout/ng/ng_fragment.h" | 9 #include "core/layout/ng/ng_fragment.h" |
10 #include "core/layout/ng/ng_length_utils.h" | 10 #include "core/layout/ng/ng_length_utils.h" |
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34 state_(kStateInit), | 34 state_(kStateInit), |
35 is_fragment_margin_strut_block_start_updated_(false) { | 35 is_fragment_margin_strut_block_start_updated_(false) { |
36 DCHECK(style_); | 36 DCHECK(style_); |
37 } | 37 } |
38 | 38 |
39 bool NGBlockLayoutAlgorithm::Layout(const NGConstraintSpace* constraint_space, | 39 bool NGBlockLayoutAlgorithm::Layout(const NGConstraintSpace* constraint_space, |
40 NGPhysicalFragment** out) { | 40 NGPhysicalFragment** out) { |
41 switch (state_) { | 41 switch (state_) { |
42 case kStateInit: { | 42 case kStateInit: { |
43 border_and_padding_ = | 43 border_and_padding_ = |
44 computeBorders(*style_) + computePadding(*constraint_space, *style_); | 44 ComputeBorders(*style_) + ComputePadding(*constraint_space, *style_); |
45 | 45 |
46 LayoutUnit inline_size = | 46 LayoutUnit inline_size = |
47 computeInlineSizeForFragment(*constraint_space, *style_); | 47 ComputeInlineSizeForFragment(*constraint_space, *style_); |
48 LayoutUnit adjusted_inline_size = | 48 LayoutUnit adjusted_inline_size = |
49 inline_size - border_and_padding_.InlineSum(); | 49 inline_size - border_and_padding_.InlineSum(); |
50 // TODO(layout-ng): For quirks mode, should we pass blockSize instead of | 50 // TODO(layout-ng): For quirks mode, should we pass blockSize instead of |
51 // -1? | 51 // -1? |
52 LayoutUnit block_size = computeBlockSizeForFragment( | 52 LayoutUnit block_size = ComputeBlockSizeForFragment( |
53 *constraint_space, *style_, NGSizeIndefinite); | 53 *constraint_space, *style_, NGSizeIndefinite); |
54 LayoutUnit adjusted_block_size(block_size); | 54 LayoutUnit adjusted_block_size(block_size); |
55 // Our calculated block-axis size may be indefinite at this point. | 55 // Our calculated block-axis size may be indefinite at this point. |
56 // If so, just leave the size as NGSizeIndefinite instead of subtracting | 56 // If so, just leave the size as NGSizeIndefinite instead of subtracting |
57 // borders and padding. | 57 // borders and padding. |
58 if (adjusted_block_size != NGSizeIndefinite) | 58 if (adjusted_block_size != NGSizeIndefinite) |
59 adjusted_block_size -= border_and_padding_.BlockSum(); | 59 adjusted_block_size -= border_and_padding_.BlockSum(); |
60 constraint_space_for_children_ = new NGConstraintSpace( | 60 constraint_space_for_children_ = new NGConstraintSpace( |
61 FromPlatformWritingMode(style_->getWritingMode()), | 61 FromPlatformWritingMode(style_->getWritingMode()), |
62 FromPlatformDirection(style_->direction()), *constraint_space, | 62 FromPlatformDirection(style_->direction()), *constraint_space, |
63 NGLogicalSize(adjusted_inline_size, adjusted_block_size)); | 63 NGLogicalSize(adjusted_inline_size, adjusted_block_size)); |
64 content_size_ = border_and_padding_.block_start; | 64 content_size_ = border_and_padding_.block_start; |
65 | 65 |
66 builder_ = new NGFragmentBuilder(NGPhysicalFragmentBase::FragmentBox); | 66 builder_ = new NGFragmentBuilder(NGPhysicalFragmentBase::FragmentBox); |
67 builder_->SetDirection(constraint_space->Direction()); | 67 builder_->SetDirection(constraint_space->Direction()); |
68 builder_->SetWritingMode(constraint_space->WritingMode()); | 68 builder_->SetWritingMode(constraint_space->WritingMode()); |
69 builder_->SetInlineSize(inline_size).SetBlockSize(block_size); | 69 builder_->SetInlineSize(inline_size).SetBlockSize(block_size); |
70 current_child_ = first_child_; | 70 current_child_ = first_child_; |
71 state_ = kStateChildLayout; | 71 state_ = kStateChildLayout; |
72 return false; | 72 return false; |
73 } | 73 } |
74 case kStateChildLayout: { | 74 case kStateChildLayout: { |
75 if (current_child_) { | 75 if (current_child_) { |
76 NGFragment* fragment; | 76 NGFragment* fragment; |
77 if (!current_child_->Layout(constraint_space_for_children_, &fragment)) | 77 if (!current_child_->Layout(constraint_space_for_children_, &fragment)) |
78 return false; | 78 return false; |
79 NGBoxStrut child_margins = computeMargins( | 79 NGBoxStrut child_margins = ComputeMargins( |
80 *constraint_space_for_children_, *current_child_->Style(), | 80 *constraint_space_for_children_, *current_child_->Style(), |
81 constraint_space_for_children_->WritingMode(), | 81 constraint_space_for_children_->WritingMode(), |
82 constraint_space_for_children_->Direction()); | 82 constraint_space_for_children_->Direction()); |
83 ApplyAutoMargins(*constraint_space_for_children_, | 83 ApplyAutoMargins(*constraint_space_for_children_, |
84 *current_child_->Style(), *fragment, child_margins); | 84 *current_child_->Style(), *fragment, child_margins); |
85 | 85 |
86 const NGBoxStrut margins = | 86 const NGBoxStrut margins = |
87 CollapseMargins(*constraint_space, child_margins, *fragment); | 87 CollapseMargins(*constraint_space, child_margins, *fragment); |
88 | 88 |
89 // TODO(layout-ng): Support auto margins | 89 // TODO(layout-ng): Support auto margins |
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101 if (current_child_) | 101 if (current_child_) |
102 return false; | 102 return false; |
103 } | 103 } |
104 state_ = kStateFinalize; | 104 state_ = kStateFinalize; |
105 return false; | 105 return false; |
106 } | 106 } |
107 case kStateFinalize: { | 107 case kStateFinalize: { |
108 content_size_ += border_and_padding_.block_end; | 108 content_size_ += border_and_padding_.block_end; |
109 | 109 |
110 // Recompute the block-axis size now that we know our content size. | 110 // Recompute the block-axis size now that we know our content size. |
111 LayoutUnit block_size = computeBlockSizeForFragment( | 111 LayoutUnit block_size = ComputeBlockSizeForFragment( |
112 *constraint_space, *style_, content_size_); | 112 *constraint_space, *style_, content_size_); |
113 | 113 |
114 builder_->SetBlockSize(block_size) | 114 builder_->SetBlockSize(block_size) |
115 .SetInlineOverflow(max_inline_size_) | 115 .SetInlineOverflow(max_inline_size_) |
116 .SetBlockOverflow(content_size_); | 116 .SetBlockOverflow(content_size_); |
117 *out = builder_->ToFragment(); | 117 *out = builder_->ToFragment(); |
118 state_ = kStateInit; | 118 state_ = kStateInit; |
119 return true; | 119 return true; |
120 } | 120 } |
121 }; | 121 }; |
122 NOTREACHED(); | 122 NOTREACHED(); |
123 *out = nullptr; | 123 *out = nullptr; |
124 return true; | 124 return true; |
125 } | 125 } |
126 | 126 |
127 NGBoxStrut NGBlockLayoutAlgorithm::CollapseMargins( | 127 NGBoxStrut NGBlockLayoutAlgorithm::CollapseMargins( |
128 const NGConstraintSpace& space, | 128 const NGConstraintSpace& space, |
129 const NGBoxStrut& margins, | 129 const NGBoxStrut& margins, |
130 const NGFragment& fragment) { | 130 const NGFragment& fragment) { |
131 bool is_zero_height_box = !fragment.BlockSize() && margins.IsEmpty() && | 131 bool is_zero_height_box = !fragment.BlockSize() && margins.IsEmpty() && |
132 fragment.MarginStrut().IsEmpty(); | 132 fragment.MarginStrut().IsEmpty(); |
133 // Create the current child's margin strut from its children's margin strut or | 133 // Create the current child's margin strut from its children's margin strut or |
134 // use margin strut from the the last non-empty child. | 134 // use margin strut from the the last non-empty child. |
135 NGMarginStrut curr_margin_strut = | 135 NGMarginStrut curr_margin_strut = |
136 is_zero_height_box ? prev_child_margin_strut_ : fragment.MarginStrut(); | 136 is_zero_height_box ? prev_child_margin_strut_ : fragment.MarginStrut(); |
137 | 137 |
138 // Calculate borders and padding for the current child. | 138 // Calculate borders and padding for the current child. |
139 NGBoxStrut border_and_padding = | 139 NGBoxStrut border_and_padding = |
140 computeBorders(*current_child_->Style()) + | 140 ComputeBorders(*current_child_->Style()) + |
141 computePadding(space, *current_child_->Style()); | 141 ComputePadding(space, *current_child_->Style()); |
142 | 142 |
143 // Collapse BLOCK-START margins if there is no padding or border between | 143 // Collapse BLOCK-START margins if there is no padding or border between |
144 // parent (current child) and its first in-flow child. | 144 // parent (current child) and its first in-flow child. |
145 if (border_and_padding.block_start) { | 145 if (border_and_padding.block_start) { |
146 curr_margin_strut.SetMarginBlockStart(margins.block_start); | 146 curr_margin_strut.SetMarginBlockStart(margins.block_start); |
147 } else { | 147 } else { |
148 curr_margin_strut.AppendMarginBlockStart(margins.block_start); | 148 curr_margin_strut.AppendMarginBlockStart(margins.block_start); |
149 } | 149 } |
150 | 150 |
151 // Collapse BLOCK-END margins if | 151 // Collapse BLOCK-END margins if |
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193 | 193 |
194 void NGBlockLayoutAlgorithm::UpdateMarginStrut(const NGMarginStrut& from) { | 194 void NGBlockLayoutAlgorithm::UpdateMarginStrut(const NGMarginStrut& from) { |
195 if (!is_fragment_margin_strut_block_start_updated_) { | 195 if (!is_fragment_margin_strut_block_start_updated_) { |
196 builder_->SetMarginStrutBlockStart(from); | 196 builder_->SetMarginStrutBlockStart(from); |
197 is_fragment_margin_strut_block_start_updated_ = true; | 197 is_fragment_margin_strut_block_start_updated_ = true; |
198 } | 198 } |
199 builder_->SetMarginStrutBlockEnd(from); | 199 builder_->SetMarginStrutBlockEnd(from); |
200 } | 200 } |
201 | 201 |
202 } // namespace blink | 202 } // namespace blink |
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