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Unified Diff: cc/trees/property_tree.h

Issue 2733633002: Handle nested position:sticky elements correctly (compositor) (Closed)
Patch Set: Add comment referencing crbug.com/702229 Created 3 years, 9 months ago
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Index: cc/trees/property_tree.h
diff --git a/cc/trees/property_tree.h b/cc/trees/property_tree.h
index f7e90ea7b47277c8df23da1df91cfd84ecc80de1..0f2719255bb93ddf36886161518925a27a049823 100644
--- a/cc/trees/property_tree.h
+++ b/cc/trees/property_tree.h
@@ -113,7 +113,17 @@ struct StickyPositionNodeData {
// by computing the additional offset necessary to keep the element stuck.
gfx::Vector2dF main_thread_offset;
- StickyPositionNodeData() : scroll_ancestor(-1) {}
+ // In order to properly compute the sticky offset, we need to know if we have
+ // any sticky ancestors both between ourselves and our containing block and
+ // between our containing block and the viewport. These ancestors are then
+ // used to correct the constraining rect locations.
+ int nearest_node_shifting_sticky_box;
+ int nearest_node_shifting_containing_block;
+
+ StickyPositionNodeData()
+ : scroll_ancestor(-1),
+ nearest_node_shifting_sticky_box(-1),
+ nearest_node_shifting_containing_block(-1) {}
};
class CC_EXPORT TransformTree final : public PropertyTree<TransformNode> {

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