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1 // Copyright 2013 The Chromium Authors. All rights reserved. | 1 // Copyright 2013 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 CC_LAYERS_LAYER_STICKY_POSITION_CONSTRAINT_H_ | 5 #ifndef CC_LAYERS_LAYER_STICKY_POSITION_CONSTRAINT_H_ |
6 #define CC_LAYERS_LAYER_STICKY_POSITION_CONSTRAINT_H_ | 6 #define CC_LAYERS_LAYER_STICKY_POSITION_CONSTRAINT_H_ |
7 | 7 |
8 #include "cc/cc_export.h" | 8 #include "cc/cc_export.h" |
9 | 9 |
| 10 #include "ui/gfx/geometry/point.h" |
10 #include "ui/gfx/geometry/rect.h" | 11 #include "ui/gfx/geometry/rect.h" |
11 | 12 |
12 namespace cc { | 13 namespace cc { |
13 | 14 |
14 struct CC_EXPORT LayerStickyPositionConstraint { | 15 struct CC_EXPORT LayerStickyPositionConstraint { |
15 LayerStickyPositionConstraint(); | 16 LayerStickyPositionConstraint(); |
16 LayerStickyPositionConstraint(const LayerStickyPositionConstraint& other); | 17 LayerStickyPositionConstraint(const LayerStickyPositionConstraint& other); |
17 | 18 |
18 bool is_sticky : 1; | 19 bool is_sticky : 1; |
19 bool is_anchored_left : 1; | 20 bool is_anchored_left : 1; |
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37 // relative to the scroll ancestor. The sticky box is only offset once the | 38 // relative to the scroll ancestor. The sticky box is only offset once the |
38 // scroll has passed its initial position (e.g. top_offset will only push | 39 // scroll has passed its initial position (e.g. top_offset will only push |
39 // the element down from its original position). | 40 // the element down from its original position). |
40 gfx::Rect scroll_container_relative_sticky_box_rect; | 41 gfx::Rect scroll_container_relative_sticky_box_rect; |
41 | 42 |
42 // The layout rectangle of the sticky box's containing block relative to the | 43 // The layout rectangle of the sticky box's containing block relative to the |
43 // scroll ancestor. The sticky box is only moved as far as its containing | 44 // scroll ancestor. The sticky box is only moved as far as its containing |
44 // block boundary. | 45 // block boundary. |
45 gfx::Rect scroll_container_relative_containing_block_rect; | 46 gfx::Rect scroll_container_relative_containing_block_rect; |
46 | 47 |
| 48 // The nearest ancestor sticky layer ids that affect the sticky box constraint |
| 49 // rect and the containing block constraint rect respectively. If no such |
| 50 // layer exists, these are set to Layer::INVALID_ID. |
| 51 int nearest_layer_shifting_sticky_box; |
| 52 int nearest_layer_shifting_containing_block; |
| 53 |
| 54 // Returns the nearest sticky ancestor layer, or Layer::INVALID_ID if no such |
| 55 // layer exists. |
| 56 int NearestStickyAncestor(); |
| 57 |
47 bool operator==(const LayerStickyPositionConstraint&) const; | 58 bool operator==(const LayerStickyPositionConstraint&) const; |
48 bool operator!=(const LayerStickyPositionConstraint&) const; | 59 bool operator!=(const LayerStickyPositionConstraint&) const; |
49 }; | 60 }; |
50 | 61 |
51 } // namespace cc | 62 } // namespace cc |
52 | 63 |
53 #endif // CC_LAYERS_LAYER_STICKY_POSITION_CONSTRAINT_H_ | 64 #endif // CC_LAYERS_LAYER_STICKY_POSITION_CONSTRAINT_H_ |
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