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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/point.h" |
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22 bool is_anchored_top : 1; | 22 bool is_anchored_top : 1; |
23 bool is_anchored_bottom : 1; | 23 bool is_anchored_bottom : 1; |
24 | 24 |
25 // The offset from each edge of the ancestor scroller (or the viewport) to | 25 // The offset from each edge of the ancestor scroller (or the viewport) to |
26 // try to maintain to the sticky box as we scroll. | 26 // try to maintain to the sticky box as we scroll. |
27 float left_offset; | 27 float left_offset; |
28 float right_offset; | 28 float right_offset; |
29 float top_offset; | 29 float top_offset; |
30 float bottom_offset; | 30 float bottom_offset; |
31 | 31 |
32 // The layout offset of the sticky box relative to its containing layer. | |
33 // This is used to detect the sticky offset the main thread has applied | |
34 // to the layer. | |
35 gfx::Point parent_relative_sticky_box_offset; | |
36 | |
37 // The rectangle corresponding to original layout position of the sticky box | 32 // The rectangle corresponding to original layout position of the sticky box |
38 // relative to the scroll ancestor. The sticky box is only offset once the | 33 // relative to the scroll ancestor. The sticky box is only offset once the |
39 // scroll has passed its initial position (e.g. top_offset will only push | 34 // scroll has passed its initial position (e.g. top_offset will only push |
40 // the element down from its original position). | 35 // the element down from its original position). |
41 gfx::Rect scroll_container_relative_sticky_box_rect; | 36 gfx::Rect scroll_container_relative_sticky_box_rect; |
42 | 37 |
43 // The layout rectangle of the sticky box's containing block relative to the | 38 // The layout rectangle of the sticky box's containing block relative to the |
44 // scroll ancestor. The sticky box is only moved as far as its containing | 39 // scroll ancestor. The sticky box is only moved as far as its containing |
45 // block boundary. | 40 // block boundary. |
46 gfx::Rect scroll_container_relative_containing_block_rect; | 41 gfx::Rect scroll_container_relative_containing_block_rect; |
47 | 42 |
48 // The nearest ancestor sticky layer ids that affect the sticky box constraint | 43 // The nearest ancestor sticky layer ids that affect the sticky box constraint |
49 // rect and the containing block constraint rect respectively. If no such | 44 // rect and the containing block constraint rect respectively. If no such |
50 // layer exists, these are set to Layer::INVALID_ID. | 45 // layer exists, these are set to Layer::INVALID_ID. |
51 int nearest_layer_shifting_sticky_box; | 46 int nearest_layer_shifting_sticky_box; |
52 int nearest_layer_shifting_containing_block; | 47 int nearest_layer_shifting_containing_block; |
53 | 48 |
54 // Returns the nearest sticky ancestor layer, or Layer::INVALID_ID if no such | 49 // Returns the nearest sticky ancestor layer, or Layer::INVALID_ID if no such |
55 // layer exists. | 50 // layer exists. |
56 int NearestStickyAncestor(); | 51 int NearestStickyAncestor(); |
57 | 52 |
58 bool operator==(const LayerStickyPositionConstraint&) const; | 53 bool operator==(const LayerStickyPositionConstraint&) const; |
59 bool operator!=(const LayerStickyPositionConstraint&) const; | 54 bool operator!=(const LayerStickyPositionConstraint&) const; |
60 }; | 55 }; |
61 | 56 |
62 } // namespace cc | 57 } // namespace cc |
63 | 58 |
64 #endif // CC_LAYERS_LAYER_STICKY_POSITION_CONSTRAINT_H_ | 59 #endif // CC_LAYERS_LAYER_STICKY_POSITION_CONSTRAINT_H_ |
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