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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 NGFragmentBuilder_h | 5 #ifndef NGFragmentBuilder_h |
6 #define NGFragmentBuilder_h | 6 #define NGFragmentBuilder_h |
7 | 7 |
8 #include "core/layout/ng/ng_physical_fragment_base.h" | |
9 #include "core/layout/ng/ng_units.h" | 8 #include "core/layout/ng/ng_units.h" |
| 9 #include "core/layout/ng/ng_physical_fragment.h" |
10 | 10 |
11 namespace blink { | 11 namespace blink { |
12 | 12 |
13 class NGFragmentBase; | 13 class NGFragment; |
14 class NGInlineNode; | 14 class NGInlineNode; |
15 class NGPhysicalFragment; | 15 class NGPhysicalBoxFragment; |
16 class NGPhysicalTextFragment; | 16 class NGPhysicalTextFragment; |
17 | 17 |
18 class CORE_EXPORT NGFragmentBuilder final | 18 class CORE_EXPORT NGFragmentBuilder final |
19 : public GarbageCollectedFinalized<NGFragmentBuilder> { | 19 : public GarbageCollectedFinalized<NGFragmentBuilder> { |
20 public: | 20 public: |
21 NGFragmentBuilder(NGPhysicalFragmentBase::NGFragmentType); | 21 NGFragmentBuilder(NGPhysicalFragment::NGFragmentType); |
22 | 22 |
23 using WeakBoxList = HeapLinkedHashSet<WeakMember<NGBlockNode>>; | 23 using WeakBoxList = HeapLinkedHashSet<WeakMember<NGBlockNode>>; |
24 | 24 |
25 NGFragmentBuilder& SetWritingMode(NGWritingMode); | 25 NGFragmentBuilder& SetWritingMode(NGWritingMode); |
26 NGFragmentBuilder& SetDirection(TextDirection); | 26 NGFragmentBuilder& SetDirection(TextDirection); |
27 | 27 |
28 NGFragmentBuilder& SetInlineSize(LayoutUnit); | 28 NGFragmentBuilder& SetInlineSize(LayoutUnit); |
29 NGFragmentBuilder& SetBlockSize(LayoutUnit); | 29 NGFragmentBuilder& SetBlockSize(LayoutUnit); |
30 NGLogicalSize Size() const { return size_; } | 30 NGLogicalSize Size() const { return size_; } |
31 | 31 |
32 NGFragmentBuilder& SetInlineOverflow(LayoutUnit); | 32 NGFragmentBuilder& SetInlineOverflow(LayoutUnit); |
33 NGFragmentBuilder& SetBlockOverflow(LayoutUnit); | 33 NGFragmentBuilder& SetBlockOverflow(LayoutUnit); |
34 | 34 |
35 NGFragmentBuilder& AddChild(NGFragmentBase*, const NGLogicalOffset&); | 35 NGFragmentBuilder& AddChild(NGFragment*, const NGLogicalOffset&); |
36 | 36 |
37 // Builder has non-trivial out-of-flow descendant methods. | 37 // Builder has non-trivial out-of-flow descendant methods. |
38 // These methods are building blocks for implementation of | 38 // These methods are building blocks for implementation of |
39 // out-of-flow descendants by layout algorithms. | 39 // out-of-flow descendants by layout algorithms. |
40 // | 40 // |
41 // They are intended to be used by layout algorithm like this: | 41 // They are intended to be used by layout algorithm like this: |
42 // | 42 // |
43 // Part 1: layout algorithm positions in-flow children. | 43 // Part 1: layout algorithm positions in-flow children. |
44 // out-of-flow children, and out-of-flow descendants of fragments | 44 // out-of-flow children, and out-of-flow descendants of fragments |
45 // are stored inside builder. | 45 // are stored inside builder. |
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82 const NGStaticPosition&); | 82 const NGStaticPosition&); |
83 | 83 |
84 // Sets MarginStrut for the resultant fragment. | 84 // Sets MarginStrut for the resultant fragment. |
85 NGFragmentBuilder& SetMarginStrutBlockStart(const NGMarginStrut& from); | 85 NGFragmentBuilder& SetMarginStrutBlockStart(const NGMarginStrut& from); |
86 NGFragmentBuilder& SetMarginStrutBlockEnd(const NGMarginStrut& from); | 86 NGFragmentBuilder& SetMarginStrutBlockEnd(const NGMarginStrut& from); |
87 | 87 |
88 // Offsets are not supposed to be set during fragment construction, so we | 88 // Offsets are not supposed to be set during fragment construction, so we |
89 // do not provide a setter here. | 89 // do not provide a setter here. |
90 | 90 |
91 // Creates the fragment. Can only be called once. | 91 // Creates the fragment. Can only be called once. |
92 NGPhysicalFragment* ToFragment(); | 92 NGPhysicalBoxFragment* ToBoxFragment(); |
93 NGPhysicalTextFragment* ToTextFragment(NGInlineNode*, | 93 NGPhysicalTextFragment* ToTextFragment(NGInlineNode*, |
94 unsigned start_index, | 94 unsigned start_index, |
95 unsigned end_index); | 95 unsigned end_index); |
96 | 96 |
97 DECLARE_VIRTUAL_TRACE(); | 97 DECLARE_VIRTUAL_TRACE(); |
98 | 98 |
99 private: | 99 private: |
100 // Out-of-flow descendant placement information. | 100 // Out-of-flow descendant placement information. |
101 // The generated fragment must compute NGStaticPosition for all | 101 // The generated fragment must compute NGStaticPosition for all |
102 // out-of-flow descendants. | 102 // out-of-flow descendants. |
103 // The resulting NGStaticPosition gets derived from: | 103 // The resulting NGStaticPosition gets derived from: |
104 // 1. The offset of fragment's child. | 104 // 1. The offset of fragment's child. |
105 // 2. The static position of descendant wrt child. | 105 // 2. The static position of descendant wrt child. |
106 // | 106 // |
107 // A child can be: | 107 // A child can be: |
108 // 1. A descendant itself. In this case, descendant position is (0,0). | 108 // 1. A descendant itself. In this case, descendant position is (0,0). |
109 // 2. A fragment containing a descendant. | 109 // 2. A fragment containing a descendant. |
110 // | 110 // |
111 // child_offset is stored as NGLogicalOffset because physical offset cannot | 111 // child_offset is stored as NGLogicalOffset because physical offset cannot |
112 // be computed until we know fragment's size. | 112 // be computed until we know fragment's size. |
113 struct OutOfFlowPlacement { | 113 struct OutOfFlowPlacement { |
114 NGLogicalOffset child_offset; | 114 NGLogicalOffset child_offset; |
115 NGStaticPosition descendant_position; | 115 NGStaticPosition descendant_position; |
116 }; | 116 }; |
117 | 117 |
118 NGPhysicalFragmentBase::NGFragmentType type_; | 118 NGPhysicalFragment::NGFragmentType type_; |
119 NGWritingMode writing_mode_; | 119 NGWritingMode writing_mode_; |
120 TextDirection direction_; | 120 TextDirection direction_; |
121 | 121 |
122 NGLogicalSize size_; | 122 NGLogicalSize size_; |
123 NGLogicalSize overflow_; | 123 NGLogicalSize overflow_; |
124 | 124 |
125 NGMarginStrut margin_strut_; | 125 NGMarginStrut margin_strut_; |
126 | 126 |
127 HeapVector<Member<NGPhysicalFragmentBase>> children_; | 127 HeapVector<Member<NGPhysicalFragment>> children_; |
128 Vector<NGLogicalOffset> offsets_; | 128 Vector<NGLogicalOffset> offsets_; |
129 | 129 |
130 WeakBoxList out_of_flow_descendant_candidates_; | 130 WeakBoxList out_of_flow_descendant_candidates_; |
131 Vector<OutOfFlowPlacement> out_of_flow_candidate_placements_; | 131 Vector<OutOfFlowPlacement> out_of_flow_candidate_placements_; |
132 | 132 |
133 WeakBoxList out_of_flow_descendants_; | 133 WeakBoxList out_of_flow_descendants_; |
134 Vector<NGStaticPosition> out_of_flow_positions_; | 134 Vector<NGStaticPosition> out_of_flow_positions_; |
135 }; | 135 }; |
136 | 136 |
137 } // namespace blink | 137 } // namespace blink |
138 | 138 |
139 #endif // NGFragmentBuilder | 139 #endif // NGFragmentBuilder |
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