Index: cc/layers/layer_sticky_position_constraint.h |
diff --git a/cc/layers/layer_sticky_position_constraint.h b/cc/layers/layer_sticky_position_constraint.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..b575a23aa26bf1978baaf11a462c0818222e7af4 |
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+++ b/cc/layers/layer_sticky_position_constraint.h |
@@ -0,0 +1,55 @@ |
+// 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_LAYERS_LAYER_STICKY_POSITION_CONSTRAINT_H_ |
+#define CC_LAYERS_LAYER_STICKY_POSITION_CONSTRAINT_H_ |
+ |
+#include "cc/base/cc_export.h" |
+ |
+#include "ui/gfx/geometry/rect.h" |
+ |
+namespace cc { |
+ |
+namespace proto { |
+class LayerStickyPositionConstraint; |
+} |
+ |
+struct CC_EXPORT LayerStickyPositionConstraint { |
+ LayerStickyPositionConstraint(); |
+ LayerStickyPositionConstraint(const LayerStickyPositionConstraint& other); |
+ |
+ bool is_sticky : 1; |
+ 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 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; |
+ |
+ void ToProtobuf(proto::LayerStickyPositionConstraint* proto) const; |
+ void FromProtobuf(const proto::LayerStickyPositionConstraint& proto); |
+ |
+ bool operator==(const LayerStickyPositionConstraint&) const; |
+ bool operator!=(const LayerStickyPositionConstraint&) const; |
+}; |
+ |
+} // namespace cc |
+ |
+#endif // CC_LAYERS_LAYER_STICKY_POSITION_CONSTRAINT_H_ |