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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 #ifndef NGBlockLayoutAlgorithm_h | 5 #ifndef NGBlockLayoutAlgorithm_h |
6 #define NGBlockLayoutAlgorithm_h | 6 #define NGBlockLayoutAlgorithm_h |
7 | 7 |
8 #include "core/CoreExport.h" | 8 #include "core/CoreExport.h" |
9 #include "core/layout/ng/ng_block_node.h" | 9 #include "core/layout/ng/ng_block_node.h" |
10 #include "core/layout/ng/ng_break_token.h" | 10 #include "core/layout/ng/ng_break_token.h" |
11 #include "core/layout/ng/ng_column_mapper.h" | 11 #include "core/layout/ng/ng_column_mapper.h" |
12 #include "core/layout/ng/ng_fragment_builder.h" | 12 #include "core/layout/ng/ng_fragment_builder.h" |
13 #include "core/layout/ng/ng_layout_algorithm.h" | 13 #include "core/layout/ng/ng_layout_algorithm.h" |
14 #include "core/layout/ng/ng_units.h" | 14 #include "core/layout/ng/ng_units.h" |
15 #include "wtf/RefPtr.h" | 15 #include "wtf/RefPtr.h" |
16 | 16 |
17 namespace blink { | 17 namespace blink { |
18 | 18 |
19 class ComputedStyle; | 19 class ComputedStyle; |
20 class NGBlockBreakToken; | 20 class NGBlockBreakToken; |
21 class NGConstraintSpace; | 21 class NGConstraintSpace; |
22 class NGConstraintSpaceBuilder; | 22 class NGConstraintSpaceBuilder; |
23 class NGInlineNode; | 23 class NGInlineNode; |
| 24 class NGLayoutResult; |
24 class NGPhysicalFragment; | 25 class NGPhysicalFragment; |
25 | 26 |
26 // A class for general block layout (e.g. a <div> with no special style). | 27 // A class for general block layout (e.g. a <div> with no special style). |
27 // Lays out the children in sequence. | 28 // Lays out the children in sequence. |
28 class CORE_EXPORT NGBlockLayoutAlgorithm : public NGLayoutAlgorithm { | 29 class CORE_EXPORT NGBlockLayoutAlgorithm : public NGLayoutAlgorithm { |
29 public: | 30 public: |
30 // Default constructor. | 31 // Default constructor. |
31 // @param node The input node to perform layout upon. | 32 // @param node The input node to perform layout upon. |
32 // @param space The constraint space which the algorithm should generate a | 33 // @param space The constraint space which the algorithm should generate a |
33 // fragment within. | 34 // fragment within. |
34 // @param break_token The break token from which the layout should start. | 35 // @param break_token The break token from which the layout should start. |
35 NGBlockLayoutAlgorithm(NGBlockNode* node, | 36 NGBlockLayoutAlgorithm(NGBlockNode* node, |
36 NGConstraintSpace* space, | 37 NGConstraintSpace* space, |
37 NGBreakToken* break_token = nullptr); | 38 NGBreakToken* break_token = nullptr); |
38 | 39 |
39 Optional<MinAndMaxContentSizes> ComputeMinAndMaxContentSizes() const override; | 40 Optional<MinAndMaxContentSizes> ComputeMinAndMaxContentSizes() const override; |
40 RefPtr<NGPhysicalFragment> Layout() override; | 41 RefPtr<NGLayoutResult> Layout() override; |
41 | 42 |
42 private: | 43 private: |
43 NGBoxStrut CalculateMargins(const NGConstraintSpace& space, | 44 NGBoxStrut CalculateMargins(const NGConstraintSpace& space, |
44 const ComputedStyle& style); | 45 const ComputedStyle& style); |
45 | 46 |
46 // Creates a new constraint space for the current child. | 47 // Creates a new constraint space for the current child. |
47 NGConstraintSpace* CreateConstraintSpaceForCurrentChild(); | 48 NGConstraintSpace* CreateConstraintSpaceForCurrentChild(); |
48 void FinishCurrentChildLayout(RefPtr<NGPhysicalBoxFragment>); | 49 void FinishCurrentChildLayout(RefPtr<NGLayoutResult>); |
49 | 50 |
50 // Layout inline children. | 51 // Layout inline children. |
51 void LayoutInlineChildren(NGInlineNode*); | 52 void LayoutInlineChildren(NGInlineNode*); |
52 | 53 |
53 // Proceed to the next sibling that still needs layout. | 54 // Proceed to the next sibling that still needs layout. |
54 // | 55 // |
55 // @param child_fragment The newly created fragment for the current child. | 56 // @param child_fragment The newly created fragment for the current child. |
56 // @return true if we can continue to lay out, or false if we need to abort | 57 // @return true if we can continue to lay out, or false if we need to abort |
57 // due to a fragmentainer break. | 58 // due to a fragmentainer break. |
58 bool ProceedToNextUnfinishedSibling(NGPhysicalFragment* child_fragment); | 59 bool ProceedToNextUnfinishedSibling(NGPhysicalFragment* child_fragment); |
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142 // MarginStrut for the previous child. | 143 // MarginStrut for the previous child. |
143 NGMarginStrut curr_margin_strut_; | 144 NGMarginStrut curr_margin_strut_; |
144 NGLogicalOffset bfc_offset_; | 145 NGLogicalOffset bfc_offset_; |
145 NGLogicalOffset curr_bfc_offset_; | 146 NGLogicalOffset curr_bfc_offset_; |
146 NGBoxStrut curr_child_margins_; | 147 NGBoxStrut curr_child_margins_; |
147 }; | 148 }; |
148 | 149 |
149 } // namespace blink | 150 } // namespace blink |
150 | 151 |
151 #endif // NGBlockLayoutAlgorithm_h | 152 #endif // NGBlockLayoutAlgorithm_h |
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