| // Copyright 2013 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef CC_TREES_STICKY_POSITION_CONSTRAINT_H_ |
| #define CC_TREES_STICKY_POSITION_CONSTRAINT_H_ |
| |
| #include "cc/cc_export.h" |
| |
| #include "cc/paint/element_id.h" |
| #include "ui/gfx/geometry/point.h" |
| #include "ui/gfx/geometry/rect.h" |
| #include "ui/gfx/geometry/rect_f.h" |
| |
| namespace cc { |
| |
| struct CC_EXPORT StickyPositionConstraint { |
| StickyPositionConstraint(); |
| StickyPositionConstraint(const StickyPositionConstraint& other); |
| |
| bool is_anchored_left : 1; |
| bool is_anchored_right : 1; |
| bool is_anchored_top : 1; |
| bool is_anchored_bottom : 1; |
| |
| // The offset from each edge of the ancestor scroller (or the viewport) to |
| // try to maintain to the sticky box as we scroll. |
| float left_offset; |
| float right_offset; |
| float top_offset; |
| float bottom_offset; |
| |
| // The rectangle in which the sticky box is able to be positioned. This may be |
| // smaller than the scroller viewport due to things like padding. |
| gfx::Rect constraint_box_rect; |
| |
| // The rectangle corresponding to original layout position of the sticky box |
| // relative to the scroll ancestor. The sticky box is only offset once the |
| // scroll has passed its initial position (e.g. top_offset will only push |
| // the element down from its original position). |
| gfx::Rect scroll_container_relative_sticky_box_rect; |
| |
| // The layout rectangle of the sticky box's containing block relative to the |
| // scroll ancestor. The sticky box is only moved as far as its containing |
| // block boundary. |
| gfx::Rect scroll_container_relative_containing_block_rect; |
| |
| // The nearest ancestor sticky element ids that affect the sticky box |
| // constraint rect and the containing block constraint rect respectively. |
| // They are used to generate nearest_node_shifting_sticky_box and |
| // nearest_node_shifting_containing_block in StickyPositionNodeData when the |
| // property trees are generated. They are useless after the property trees |
| // are generated. |
| ElementId nearest_element_shifting_sticky_box; |
| ElementId nearest_element_shifting_containing_block; |
| |
| bool operator==(const StickyPositionConstraint&) const; |
| bool operator!=(const StickyPositionConstraint&) const; |
| }; |
| |
| } // namespace cc |
| |
| #endif // CC_TREES_STICKY_POSITION_CONSTRAINT_H_ |