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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 | |
3 // found in the LICENSE file. | |
4 | |
5 #ifndef NGPhysicalFragmentBase_h | |
6 #define NGPhysicalFragmentBase_h | |
7 | |
8 #include "core/CoreExport.h" | |
9 #include "core/layout/ng/ng_units.h" | |
10 #include "platform/LayoutUnit.h" | |
11 #include "platform/heap/Handle.h" | |
12 #include "wtf/Vector.h" | |
13 | |
14 namespace blink { | |
15 | |
16 class NGBlockNode; | |
17 class NGBreakToken; | |
18 | |
19 // The NGPhysicalFragmentBase contains the output information from layout. The | |
20 // fragment stores all of its information in the physical coordinate system for | |
21 // use by paint, hit-testing etc. | |
22 // | |
23 // Layout code should only access output layout information through the | |
24 // NGFragmentBase classes which transforms information into the logical | |
25 // coordinate system. | |
26 class CORE_EXPORT NGPhysicalFragmentBase | |
27 : public GarbageCollectedFinalized<NGPhysicalFragmentBase> { | |
28 public: | |
29 enum NGFragmentType { kFragmentBox = 0, kFragmentText = 1 }; | |
30 | |
31 NGFragmentType Type() const { return static_cast<NGFragmentType>(type_); } | |
32 | |
33 // The accessors in this class shouldn't be used by layout code directly, | |
34 // instead should be accessed by the NGFragmentBase classes. These accessors | |
35 // exist for paint, hit-testing, etc. | |
36 | |
37 // Returns the border-box size. | |
38 NGPhysicalSize Size() const { return size_; } | |
39 LayoutUnit Width() const { return size_.width; } | |
40 LayoutUnit Height() const { return size_.height; } | |
41 | |
42 // Returns the total size, including the contents outside of the border-box. | |
43 LayoutUnit WidthOverflow() const { return overflow_.width; } | |
44 LayoutUnit HeightOverflow() const { return overflow_.height; } | |
45 | |
46 // Returns the offset relative to the parent fragement's content-box. | |
47 LayoutUnit LeftOffset() const { | |
48 DCHECK(has_been_placed_); | |
49 return offset_.left; | |
50 } | |
51 | |
52 LayoutUnit TopOffset() const { | |
53 DCHECK(has_been_placed_); | |
54 return offset_.top; | |
55 } | |
56 | |
57 // Should only be used by the parent fragement's layout. | |
58 void SetOffset(NGPhysicalOffset offset) { | |
59 DCHECK(!has_been_placed_); | |
60 offset_ = offset; | |
61 has_been_placed_ = true; | |
62 } | |
63 | |
64 const HeapLinkedHashSet<WeakMember<NGBlockNode>>& OutOfFlowDescendants() | |
65 const { | |
66 return out_of_flow_descendants_; | |
67 } | |
68 | |
69 const Vector<NGStaticPosition>& OutOfFlowPositions() const { | |
70 return out_of_flow_positions_; | |
71 } | |
72 | |
73 DECLARE_TRACE_AFTER_DISPATCH(); | |
74 DECLARE_TRACE(); | |
75 | |
76 void finalizeGarbageCollectedObject(); | |
77 | |
78 protected: | |
79 NGPhysicalFragmentBase( | |
80 NGPhysicalSize size, | |
81 NGPhysicalSize overflow, | |
82 NGFragmentType type, | |
83 HeapLinkedHashSet<WeakMember<NGBlockNode>>& out_of_flow_descendants, | |
84 Vector<NGStaticPosition> out_of_flow_positions, | |
85 NGBreakToken* break_token = nullptr); | |
86 | |
87 NGPhysicalSize size_; | |
88 NGPhysicalSize overflow_; | |
89 NGPhysicalOffset offset_; | |
90 Member<NGBreakToken> break_token_; | |
91 HeapLinkedHashSet<WeakMember<NGBlockNode>> out_of_flow_descendants_; | |
92 Vector<NGStaticPosition> out_of_flow_positions_; | |
93 | |
94 unsigned type_ : 1; | |
95 unsigned has_been_placed_ : 1; | |
96 }; | |
97 | |
98 } // namespace blink | |
99 | |
100 #endif // NGFragmentBase_h | |
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