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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 NGLayoutOpportunityTreeNode_h | 5 #ifndef NGLayoutOpportunityTreeNode_h |
6 #define NGLayoutOpportunityTreeNode_h | 6 #define NGLayoutOpportunityTreeNode_h |
7 | 7 |
8 #include "core/layout/ng/geometry/ng_edge.h" | 8 #include "core/layout/ng/geometry/ng_edge.h" |
9 #include "core/layout/ng/geometry/ng_logical_rect.h" | 9 #include "core/layout/ng/geometry/ng_logical_rect.h" |
10 #include "core/layout/ng/ng_exclusion.h" | 10 #include "core/layout/ng/ng_exclusion.h" |
11 #include "platform/heap/Handle.h" | |
12 | 11 |
13 namespace blink { | 12 namespace blink { |
14 | 13 |
15 // 3 node R-Tree that represents available space(left, bottom, right) or | 14 // 3 node R-Tree that represents available space(left, bottom, right) or |
16 // layout opportunity after the parent spatial rectangle is split by the | 15 // layout opportunity after the parent spatial rectangle is split by the |
17 // exclusion rectangle. | 16 // exclusion rectangle. |
18 struct CORE_EXPORT NGLayoutOpportunityTreeNode | 17 struct CORE_EXPORT NGLayoutOpportunityTreeNode { |
19 : public GarbageCollectedFinalized<NGLayoutOpportunityTreeNode> { | |
20 public: | 18 public: |
21 // Default constructor. | 19 // Default constructor. |
22 // Creates a Layout Opportunity tree node that is limited by it's own edge | 20 // Creates a Layout Opportunity tree node that is limited by it's own edge |
23 // from above. | 21 // from above. |
24 // @param opportunity The layout opportunity for this node. | 22 // @param opportunity The layout opportunity for this node. |
25 NGLayoutOpportunityTreeNode(const NGLogicalRect opportunity); | 23 NGLayoutOpportunityTreeNode(const NGLogicalRect opportunity); |
26 | 24 |
27 // Constructor that creates a node with explicitly set exclusion edge. | 25 // Constructor that creates a node with explicitly set exclusion edge. |
28 // @param opportunity The layout opportunity for this node. | 26 // @param opportunity The layout opportunity for this node. |
29 // @param exclusion_edge Edge that limits this node's opportunity from above. | 27 // @param exclusion_edge Edge that limits this node's opportunity from above. |
30 NGLayoutOpportunityTreeNode(const NGLogicalRect opportunity, | 28 NGLayoutOpportunityTreeNode(const NGLogicalRect opportunity, |
31 NGEdge exclusion_edge); | 29 NGEdge exclusion_edge); |
32 | 30 |
33 // Children of the node. | 31 // Children of the node. |
34 Member<NGLayoutOpportunityTreeNode> left; | 32 std::unique_ptr<NGLayoutOpportunityTreeNode> left; |
35 Member<NGLayoutOpportunityTreeNode> bottom; | 33 std::unique_ptr<NGLayoutOpportunityTreeNode> bottom; |
36 Member<NGLayoutOpportunityTreeNode> right; | 34 std::unique_ptr<NGLayoutOpportunityTreeNode> right; |
37 | 35 |
38 // The top layout opportunity associated with this node. | 36 // The top layout opportunity associated with this node. |
39 NGLogicalRect opportunity; | 37 NGLogicalRect opportunity; |
40 | 38 |
41 // Edge that limits this layout opportunity from above. | 39 // Edge that limits this layout opportunity from above. |
42 NGEdge exclusion_edge; | 40 NGEdge exclusion_edge; |
43 | 41 |
44 // Exclusions that splits apart this layout opportunity. | 42 // Exclusions that splits apart this layout opportunity. |
45 Vector<const NGExclusion*> exclusions; // Not owned. | 43 Vector<const NGExclusion*> exclusions; // Not owned. |
46 | 44 |
47 // Exclusion that represent all combined exclusions that | 45 // Exclusion that represent all combined exclusions that |
48 // split this node. | 46 // split this node. |
49 std::unique_ptr<NGExclusion> combined_exclusion; | 47 std::unique_ptr<NGExclusion> combined_exclusion; |
50 | 48 |
51 // Whether this node is a leaf node. | 49 // Whether this node is a leaf node. |
52 // The node is a leaf if it doesn't have exclusions that split it apart. | 50 // The node is a leaf if it doesn't have exclusions that split it apart. |
53 bool IsLeafNode() const { return exclusions.isEmpty(); } | 51 bool IsLeafNode() const { return exclusions.isEmpty(); } |
54 | 52 |
55 String ToString() const; | 53 String ToString() const; |
56 | |
57 DECLARE_TRACE(); | |
58 }; | 54 }; |
59 | 55 |
60 inline std::ostream& operator<<(std::ostream& stream, | 56 inline std::ostream& operator<<(std::ostream& stream, |
61 const NGLayoutOpportunityTreeNode& value) { | 57 const NGLayoutOpportunityTreeNode& value) { |
62 return stream << value.ToString(); | 58 return stream << value.ToString(); |
63 } | 59 } |
64 | 60 |
65 inline std::ostream& operator<<(std::ostream& out, | 61 inline std::ostream& operator<<(std::ostream& out, |
66 const NGLayoutOpportunityTreeNode* value) { | 62 const NGLayoutOpportunityTreeNode* value) { |
67 return out << (value ? value->ToString() : "(null)"); | 63 return out << (value ? value->ToString() : "(null)"); |
68 } | 64 } |
69 | 65 |
70 } // namespace blink | 66 } // namespace blink |
71 #endif // NGLayoutOpportunityTreeNode_h | 67 #endif // NGLayoutOpportunityTreeNode_h |
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