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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/rect.h" | 10 #include "ui/gfx/geometry/point_f.h" |
| 11 #include "ui/gfx/geometry/rect_f.h" |
| 12 #include "ui/gfx/geometry/vector2d_f.h" |
11 | 13 |
12 namespace cc { | 14 namespace cc { |
13 | 15 |
14 struct CC_EXPORT LayerStickyPositionConstraint { | 16 struct CC_EXPORT LayerStickyPositionConstraint { |
15 LayerStickyPositionConstraint(); | 17 LayerStickyPositionConstraint(); |
16 LayerStickyPositionConstraint(const LayerStickyPositionConstraint& other); | 18 LayerStickyPositionConstraint(const LayerStickyPositionConstraint& other); |
17 | 19 |
18 bool is_sticky : 1; | 20 bool is_sticky : 1; |
19 bool is_anchored_left : 1; | 21 bool is_anchored_left : 1; |
20 bool is_anchored_right : 1; | 22 bool is_anchored_right : 1; |
21 bool is_anchored_top : 1; | 23 bool is_anchored_top : 1; |
22 bool is_anchored_bottom : 1; | 24 bool is_anchored_bottom : 1; |
23 | 25 |
24 // The offset from each edge of the ancestor scroller (or the viewport) to | 26 // The offset from each edge of the ancestor scroller (or the viewport) to |
25 // try to maintain to the sticky box as we scroll. | 27 // try to maintain to the sticky box as we scroll. |
26 float left_offset; | 28 float left_offset; |
27 float right_offset; | 29 float right_offset; |
28 float top_offset; | 30 float top_offset; |
29 float bottom_offset; | 31 float bottom_offset; |
30 | 32 |
31 // The layout offset of the sticky box relative to its containing layer. | 33 // The layout offset of the sticky box relative to its containing layer. |
32 // This is used to detect the sticky offset the main thread has applied | 34 // This is used to detect the sticky offset the main thread has applied |
33 // to the layer. | 35 // to the layer. |
34 gfx::Point parent_relative_sticky_box_offset; | 36 gfx::PointF parent_relative_sticky_box_offset; |
35 | 37 |
36 // The rectangle corresponding to original layout position of the sticky box | 38 // The rectangle corresponding to original layout position of the sticky box |
37 // relative to the scroll ancestor. The sticky box is only offset once the | 39 // 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 | 40 // scroll has passed its initial position (e.g. top_offset will only push |
39 // the element down from its original position). | 41 // the element down from its original position). |
40 gfx::Rect scroll_container_relative_sticky_box_rect; | 42 gfx::RectF scroll_container_relative_sticky_box_rect; |
41 | 43 |
42 // The layout rectangle of the sticky box's containing block relative to the | 44 // 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 | 45 // scroll ancestor. The sticky box is only moved as far as its containing |
44 // block boundary. | 46 // block boundary. |
45 gfx::Rect scroll_container_relative_containing_block_rect; | 47 gfx::RectF scroll_container_relative_containing_block_rect; |
| 48 |
| 49 // The nearest ancestor sticky layer ids that affect the sticky box constraint |
| 50 // rect and the containing block constraint rect respectively. If no such |
| 51 // layer exists, these are set to Layer::INVALID_ID. |
| 52 int nearest_layer_shifting_sticky_box; |
| 53 int nearest_layer_shifting_containing_block; |
| 54 |
| 55 // Returns the nearest sticky ancestor layer, or Layer::INVALID_ID if no such |
| 56 // layer exists. |
| 57 int NearestStickyAncestor(); |
46 | 58 |
47 bool operator==(const LayerStickyPositionConstraint&) const; | 59 bool operator==(const LayerStickyPositionConstraint&) const; |
48 bool operator!=(const LayerStickyPositionConstraint&) const; | 60 bool operator!=(const LayerStickyPositionConstraint&) const; |
49 }; | 61 }; |
50 | 62 |
51 } // namespace cc | 63 } // namespace cc |
52 | 64 |
53 #endif // CC_LAYERS_LAYER_STICKY_POSITION_CONSTRAINT_H_ | 65 #endif // CC_LAYERS_LAYER_STICKY_POSITION_CONSTRAINT_H_ |
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