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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 NGConstraintSpace_h | 5 #ifndef NGConstraintSpace_h |
6 #define NGConstraintSpace_h | 6 #define NGConstraintSpace_h |
7 | 7 |
8 #include "core/CoreExport.h" | 8 #include "core/CoreExport.h" |
9 #include "core/layout/ng/ng_physical_constraint_space.h" | 9 #include "core/layout/ng/ng_physical_constraint_space.h" |
10 #include "core/layout/ng/ng_writing_mode.h" | 10 #include "core/layout/ng/ng_writing_mode.h" |
11 #include "platform/heap/Handle.h" | 11 #include "platform/heap/Handle.h" |
12 #include "wtf/text/WTFString.h" | 12 #include "wtf/text/WTFString.h" |
13 #include "wtf/Vector.h" | 13 #include "wtf/Vector.h" |
14 | 14 |
15 namespace blink { | 15 namespace blink { |
16 | 16 |
17 class LayoutBox; | 17 class LayoutBox; |
18 class NGFragment; | 18 class NGFragment; |
19 class NGLayoutOpportunityIterator; | 19 class NGLayoutOpportunityIterator; |
20 | 20 |
21 // The NGConstraintSpace represents a set of constraints and available space | 21 // The NGConstraintSpace represents a set of constraints and available space |
22 // which a layout algorithm may produce a NGFragment within. It is a view on | 22 // which a layout algorithm may produce a NGFragment within. It is a view on |
23 // top of a NGPhysicalConstraintSpace and provides accessor methods in the | 23 // top of a NGPhysicalConstraintSpace and provides accessor methods in the |
24 // logical coordinate system defined by the writing mode given. | 24 // logical coordinate system defined by the writing mode given. |
25 class CORE_EXPORT NGConstraintSpace final | 25 class CORE_EXPORT NGConstraintSpace final |
26 : public GarbageCollected<NGConstraintSpace> { | 26 : public GarbageCollected<NGConstraintSpace> { |
27 public: | 27 public: |
28 // Constructs a constraint space with a new backing NGPhysicalConstraintSpace. | 28 // Constructs a constraint space with a new backing NGPhysicalConstraintSpace. |
| 29 // The size will be used for both for the physical constraint space's |
| 30 // container size and this constraint space's Size(). |
29 NGConstraintSpace(NGWritingMode, NGDirection, NGLogicalSize); | 31 NGConstraintSpace(NGWritingMode, NGDirection, NGLogicalSize); |
30 | 32 |
31 // Constructs a constraint space based on an existing backing | 33 // Constructs a constraint space based on an existing backing |
32 // NGPhysicalConstraintSpace. | 34 // NGPhysicalConstraintSpace. Sets this constraint space's size to the |
| 35 // physical constraint space's container size, converted to logical |
| 36 // coordinates. |
| 37 // TODO(layout-ng): Do we need this constructor? |
33 NGConstraintSpace(NGWritingMode, NGDirection, NGPhysicalConstraintSpace*); | 38 NGConstraintSpace(NGWritingMode, NGDirection, NGPhysicalConstraintSpace*); |
34 | 39 |
35 // Constructs a constraint space with a different NGWritingMode and | 40 // Constructs a constraint space with a different NGWritingMode and |
36 // NGDirection. | 41 // NGDirection that's otherwise identical. |
37 NGConstraintSpace(NGWritingMode, NGDirection, const NGConstraintSpace*); | 42 NGConstraintSpace(NGWritingMode, NGDirection, const NGConstraintSpace*); |
38 | 43 |
39 // Constructs a derived constraint space sharing the same backing | 44 // Constructs a derived constraint space sharing the same backing |
40 // NGPhysicalConstraintSpace, NGWritingMode and NGDirection. | 45 // NGPhysicalConstraintSpace, NGWritingMode and NGDirection. Primarily for use |
| 46 // by NGLayoutOpportunityIterator. |
41 NGConstraintSpace(const NGConstraintSpace& other, | 47 NGConstraintSpace(const NGConstraintSpace& other, |
42 NGLogicalOffset, | 48 NGLogicalOffset, |
43 NGLogicalSize); | 49 NGLogicalSize); |
44 | 50 |
45 // Constructs a derived constraint space sharing the same backing | 51 // Constructs a derived constraint space that shares the exclusions of the |
46 // NGPhysicalConstraintSpace, a different NGWritingMode and NGDirection. | 52 // input constraint space, but has a different container size, writing mode |
| 53 // and direction. Sets the offset to zero. For use by layout algorithms |
| 54 // to use as the basis to find layout opportunities for children. |
47 NGConstraintSpace(NGWritingMode, | 55 NGConstraintSpace(NGWritingMode, |
48 NGDirection, | 56 NGDirection, |
49 const NGConstraintSpace& other, | 57 const NGConstraintSpace& other, |
50 NGLogicalOffset, | |
51 NGLogicalSize); | 58 NGLogicalSize); |
52 | 59 |
53 // This should live on NGBox or another layout bridge and probably take a root | 60 // This should live on NGBox or another layout bridge and probably take a root |
54 // NGConstraintSpace or a NGPhysicalConstraintSpace. | 61 // NGConstraintSpace or a NGPhysicalConstraintSpace. |
55 static NGConstraintSpace* CreateFromLayoutObject(const LayoutBox&); | 62 static NGConstraintSpace* CreateFromLayoutObject(const LayoutBox&); |
56 | 63 |
57 NGPhysicalConstraintSpace* PhysicalSpace() const { return physical_space_; } | 64 NGPhysicalConstraintSpace* PhysicalSpace() const { return physical_space_; } |
58 | 65 |
59 NGDirection Direction() const { return static_cast<NGDirection>(direction_); } | 66 NGDirection Direction() const { return static_cast<NGDirection>(direction_); } |
60 | 67 |
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124 }; | 131 }; |
125 | 132 |
126 inline std::ostream& operator<<(std::ostream& stream, | 133 inline std::ostream& operator<<(std::ostream& stream, |
127 const NGConstraintSpace& value) { | 134 const NGConstraintSpace& value) { |
128 return stream << value.toString(); | 135 return stream << value.toString(); |
129 } | 136 } |
130 | 137 |
131 } // namespace blink | 138 } // namespace blink |
132 | 139 |
133 #endif // NGConstraintSpace_h | 140 #endif // NGConstraintSpace_h |
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