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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 #include "core/page/scrolling/StickyPositionScrollingConstraints.h" | 5 #include "core/page/scrolling/StickyPositionScrollingConstraints.h" |
| 6 #include "core/paint/PaintLayer.h" |
6 | 7 |
7 namespace blink { | 8 namespace blink { |
8 | 9 |
9 FloatSize StickyPositionScrollingConstraints::ComputeStickyOffset( | 10 FloatSize StickyPositionScrollingConstraints::ComputeStickyOffset( |
10 const FloatRect& viewport_rect, | 11 const FloatRect& viewport_rect, |
11 const StickyPositionScrollingConstraints* ancestor_sticky_box_constraints, | 12 const StickyPositionScrollingConstraints* ancestor_sticky_box_constraints, |
12 const StickyPositionScrollingConstraints* | 13 const StickyPositionScrollingConstraints* |
13 ancestor_containing_block_constraints) { | 14 ancestor_containing_block_constraints) { |
14 // Adjust the constraint rect locations based on our ancestor sticky elements | 15 // Adjust the constraint rect locations based on our ancestor sticky elements |
15 // These adjustments are necessary to avoid double offsetting in the case of | 16 // These adjustments are necessary to avoid double offsetting in the case of |
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81 FloatSize sticky_offset = box_rect.Location() - sticky_box_rect.Location(); | 82 FloatSize sticky_offset = box_rect.Location() - sticky_box_rect.Location(); |
82 | 83 |
83 total_sticky_box_sticky_offset_ = ancestor_sticky_box_offset + sticky_offset; | 84 total_sticky_box_sticky_offset_ = ancestor_sticky_box_offset + sticky_offset; |
84 total_containing_block_sticky_offset_ = ancestor_sticky_box_offset + | 85 total_containing_block_sticky_offset_ = ancestor_sticky_box_offset + |
85 ancestor_containing_block_offset + | 86 ancestor_containing_block_offset + |
86 sticky_offset; | 87 sticky_offset; |
87 | 88 |
88 return sticky_offset; | 89 return sticky_offset; |
89 } | 90 } |
90 | 91 |
| 92 FloatSize StickyPositionScrollingConstraints::GetLocalStickyOffset( |
| 93 const StickyConstraintsMap& constraints_map) const { |
| 94 FloatSize nearest_sticky_box_shifting_sticky_box_constraints_offset; |
| 95 if (nearest_sticky_box_shifting_sticky_box_) { |
| 96 nearest_sticky_box_shifting_sticky_box_constraints_offset = |
| 97 constraints_map.at(nearest_sticky_box_shifting_sticky_box_->Layer()) |
| 98 .GetTotalStickyBoxStickyOffset(); |
| 99 } |
| 100 return total_sticky_box_sticky_offset_ - |
| 101 nearest_sticky_box_shifting_sticky_box_constraints_offset; |
| 102 } |
| 103 |
91 } // namespace blink | 104 } // namespace blink |
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