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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/geometry/ng_margin_strut.h" | 9 #include "core/layout/ng/geometry/ng_margin_strut.h" |
10 #include "core/layout/ng/ng_block_break_token.h" | 10 #include "core/layout/ng/ng_block_break_token.h" |
11 #include "core/layout/ng/ng_block_node.h" | 11 #include "core/layout/ng/ng_block_node.h" |
| 12 #include "core/layout/ng/ng_box_fragment.h" |
12 #include "core/layout/ng/ng_constraint_space_builder.h" | 13 #include "core/layout/ng/ng_constraint_space_builder.h" |
13 #include "core/layout/ng/ng_layout_algorithm.h" | 14 #include "core/layout/ng/ng_layout_algorithm.h" |
14 #include "platform/wtf/RefPtr.h" | 15 #include "platform/wtf/RefPtr.h" |
15 | 16 |
16 namespace blink { | 17 namespace blink { |
17 | 18 |
18 class NGConstraintSpace; | 19 class NGConstraintSpace; |
19 class NGLayoutResult; | 20 class NGLayoutResult; |
20 | 21 |
21 // Updates the fragment's BFC offset if it's not already set. | 22 // Updates the fragment's BFC offset if it's not already set. |
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38 NGBlockBreakToken* break_token = nullptr); | 39 NGBlockBreakToken* break_token = nullptr); |
39 | 40 |
40 Optional<MinMaxContentSize> ComputeMinMaxContentSize() const override; | 41 Optional<MinMaxContentSize> ComputeMinMaxContentSize() const override; |
41 virtual RefPtr<NGLayoutResult> Layout() override; | 42 virtual RefPtr<NGLayoutResult> Layout() override; |
42 | 43 |
43 private: | 44 private: |
44 NGBoxStrut CalculateMargins(NGLayoutInputNode* child, | 45 NGBoxStrut CalculateMargins(NGLayoutInputNode* child, |
45 const NGConstraintSpace& space); | 46 const NGConstraintSpace& space); |
46 | 47 |
47 // Creates a new constraint space for the current child. | 48 // Creates a new constraint space for the current child. |
48 RefPtr<NGConstraintSpace> CreateConstraintSpaceForChild(NGLayoutInputNode*); | 49 RefPtr<NGConstraintSpace> CreateConstraintSpaceForChild( |
49 void PrepareChildLayout(NGLayoutInputNode*); | 50 const NGLogicalOffset& child_bfc_offset, |
50 void FinishChildLayout(NGLayoutInputNode*, | 51 NGLayoutInputNode*); |
51 NGConstraintSpace*, | 52 NGLogicalOffset PrepareChildLayout(NGLayoutInputNode*); |
52 RefPtr<NGLayoutResult>); | 53 |
| 54 void FinishChildLayout(const NGConstraintSpace*, NGLayoutResult*); |
| 55 |
| 56 void FinishFloatChildLayout(const ComputedStyle&, |
| 57 const NGConstraintSpace&, |
| 58 const NGLayoutResult*); |
53 | 59 |
54 // Final adjustments before fragment creation. We need to prevent the | 60 // Final adjustments before fragment creation. We need to prevent the |
55 // fragment from crossing fragmentainer boundaries, and rather create a break | 61 // fragment from crossing fragmentainer boundaries, and rather create a break |
56 // token if we're out of space. | 62 // token if we're out of space. |
57 void FinalizeForFragmentation(); | 63 void FinalizeForFragmentation(); |
58 | 64 |
59 // Calculates logical offset for the current fragment using either | 65 // Calculates logical offset for the current fragment using either |
60 // {@code content_size_} when the fragment doesn't know it's offset | 66 // {@code content_size_} when the fragment doesn't know it's offset |
61 // or {@code known_fragment_offset} if the fragment knows it's offset | 67 // or {@code known_fragment_offset} if the fragment knows it's offset |
62 // @return Fragment's offset relative to the fragment's parent. | 68 // @return Fragment's offset relative to the fragment's parent. |
63 NGLogicalOffset CalculateLogicalOffset( | 69 NGLogicalOffset CalculateLogicalOffset( |
64 const WTF::Optional<NGLogicalOffset>& known_fragment_offset); | 70 const WTF::Optional<NGLogicalOffset>& known_fragment_offset); |
65 | 71 |
| 72 // Positions the fragment that establishes a new formatting context. |
| 73 NGLogicalOffset PositionNewFc(const NGBoxFragment&, |
| 74 const NGConstraintSpace* child_space); |
| 75 |
| 76 // Positions the fragment that knows its BFC offset. |
| 77 NGLogicalOffset PositionWithBfcOffset(const NGBoxFragment&); |
| 78 |
| 79 // Positions using the parent BFC offset. |
| 80 // Fragment doesn't know its offset but we can still calculate its BFC |
| 81 // position because the parent fragment's BFC is known. |
| 82 // Example: |
| 83 // BFC Offset is known here because of the padding. |
| 84 // <div style="padding: 1px"> |
| 85 // <div id="empty-div" style="margins: 1px"></div> |
| 86 NGLogicalOffset PositionWithParentBfc(); |
| 87 |
66 NGConstraintSpaceBuilder space_builder_; | 88 NGConstraintSpaceBuilder space_builder_; |
67 | 89 |
68 NGBoxStrut border_and_padding_; | 90 NGBoxStrut border_and_padding_; |
69 LayoutUnit content_size_; | 91 LayoutUnit content_size_; |
70 LayoutUnit max_inline_size_; | 92 LayoutUnit max_inline_size_; |
71 // MarginStrut for the previous child. | 93 // MarginStrut for the previous child. |
72 NGMarginStrut curr_margin_strut_; | 94 NGMarginStrut curr_margin_strut_; |
73 NGLogicalOffset curr_bfc_offset_; | 95 NGLogicalOffset curr_bfc_offset_; |
74 NGBoxStrut curr_child_margins_; | 96 NGBoxStrut curr_child_margins_; |
75 }; | 97 }; |
76 | 98 |
77 } // namespace blink | 99 } // namespace blink |
78 | 100 |
79 #endif // NGBlockLayoutAlgorithm_h | 101 #endif // NGBlockLayoutAlgorithm_h |
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