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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 NGLayoutAlgorithm_h | 5 #ifndef NGLayoutAlgorithm_h |
6 #define NGLayoutAlgorithm_h | 6 #define NGLayoutAlgorithm_h |
7 | 7 |
8 #include "core/CoreExport.h" | 8 #include "core/CoreExport.h" |
9 #include "platform/heap/Handle.h" | |
10 #include "wtf/Allocator.h" | 9 #include "wtf/Allocator.h" |
11 #include "wtf/Noncopyable.h" | 10 #include "wtf/Noncopyable.h" |
12 | 11 |
13 namespace blink { | 12 namespace blink { |
14 | 13 |
15 struct MinAndMaxContentSizes; | 14 struct MinAndMaxContentSizes; |
16 class NGConstraintSpace; | |
17 class NGPhysicalFragment; | 15 class NGPhysicalFragment; |
18 | 16 |
19 enum NGLayoutStatus { kNotFinished, kChildAlgorithmRequired, kNewFragment }; | |
20 | |
21 enum NGLayoutAlgorithmType { | |
22 kBlockLayoutAlgorithm, | |
23 kInlineLayoutAlgorithm, | |
24 kLegacyBlockLayoutAlgorithm, | |
25 kTextLayoutAlgorithm | |
26 }; | |
27 | |
28 // Base class for all LayoutNG algorithms. | 17 // Base class for all LayoutNG algorithms. |
29 class CORE_EXPORT NGLayoutAlgorithm | 18 class CORE_EXPORT NGLayoutAlgorithm { |
30 : public GarbageCollectedFinalized<NGLayoutAlgorithm> { | 19 STACK_ALLOCATED(); |
31 WTF_MAKE_NONCOPYABLE(NGLayoutAlgorithm); | |
32 | 20 |
33 public: | 21 public: |
34 NGLayoutAlgorithm(NGLayoutAlgorithmType type) : type_(type) {} | |
35 virtual ~NGLayoutAlgorithm() {} | 22 virtual ~NGLayoutAlgorithm() {} |
36 | 23 |
37 // Actual layout function. Lays out the children and descendents within the | 24 // Actual layout function. Lays out the children and descendents within the |
38 // constraints given by the NGConstraintSpace. Returns a fragment with the | 25 // constraints given by the NGConstraintSpace. Returns a fragment with the |
39 // resulting layout information. | 26 // resulting layout information. |
40 // TODO(layout-dev): attempt to make this function const. | 27 // TODO(layout-dev): attempt to make this function const. |
41 virtual NGPhysicalFragment* Layout() = 0; | 28 virtual NGPhysicalFragment* Layout() = 0; |
42 | 29 |
43 enum MinAndMaxState { kSuccess, kPending, kNotImplemented }; | |
44 | |
45 // Computes the min-content and max-content intrinsic sizes for the given box. | 30 // Computes the min-content and max-content intrinsic sizes for the given box. |
46 // The result will not take any min-width, max-width or width properties into | 31 // The result will not take any min-width, max-width or width properties into |
47 // account. Implementations can return false, in which case the caller is | 32 // account. Implementations can return false, in which case the caller is |
48 // expected to synthesize this value from the overflow rect returned from | 33 // expected to synthesize this value from the overflow rect returned from |
49 // Layout called with a available width of 0 and LayoutUnit::max(), | 34 // Layout called with a available width of 0 and LayoutUnit::max(), |
50 // respectively. | 35 // respectively. |
51 virtual bool ComputeMinAndMaxContentSizes(MinAndMaxContentSizes*) const { | 36 virtual bool ComputeMinAndMaxContentSizes(MinAndMaxContentSizes*) const { |
52 return false; | 37 return false; |
53 } | 38 } |
54 | |
55 DEFINE_INLINE_VIRTUAL_TRACE() {} | |
56 | |
57 NGLayoutAlgorithmType algorithmType() const { return type_; } | |
58 | |
59 private: | |
60 NGLayoutAlgorithmType type_; | |
61 }; | 39 }; |
62 | 40 |
63 } // namespace blink | 41 } // namespace blink |
64 | 42 |
65 #endif // NGLayoutAlgorithm_h | 43 #endif // NGLayoutAlgorithm_h |
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