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Unified Diff: cc/trees/layer_tree_host_common_unittest.cc

Issue 2733633002: Handle nested position:sticky elements correctly (compositor) (Closed)
Patch Set: Addressed the easier reviewer comments. Created 3 years, 9 months ago
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Index: cc/trees/layer_tree_host_common_unittest.cc
diff --git a/cc/trees/layer_tree_host_common_unittest.cc b/cc/trees/layer_tree_host_common_unittest.cc
index 4f4511d9efd59b2dd51ce33977b0d5d559cf3a9b..08355885e7c7e6212fe7898d2e5c3a0f70cf81ef 100644
--- a/cc/trees/layer_tree_host_common_unittest.cc
+++ b/cc/trees/layer_tree_host_common_unittest.cc
@@ -7920,6 +7920,106 @@ TEST_F(LayerTreeHostCommonTest, StickyPositionScaledContainer) {
sticky_pos_impl->ScreenSpaceTransform().To2dTranslation());
}
+TEST_F(LayerTreeHostCommonTest, StickyPositionNested) {
+ scoped_refptr<Layer> root = Layer::Create();
+ scoped_refptr<Layer> container = Layer::Create();
+ scoped_refptr<Layer> scroller = Layer::Create();
+ scoped_refptr<Layer> outer_sticky = Layer::Create();
+ scoped_refptr<Layer> inner_sticky = Layer::Create();
+
+ root->AddChild(container);
+ container->AddChild(scroller);
+ scroller->AddChild(outer_sticky);
+ outer_sticky->AddChild(inner_sticky);
+ host()->SetRootLayer(root);
+ scroller->SetScrollClipLayerId(container->id());
+
+ root->SetBounds(gfx::Size(100, 100));
+ container->SetBounds(gfx::Size(100, 100));
+ scroller->SetBounds(gfx::Size(100, 1000));
+ outer_sticky->SetBounds(gfx::Size(10, 50));
+ outer_sticky->SetPosition(gfx::PointF(0, 50));
+ inner_sticky->SetBounds(gfx::Size(10, 10));
+ inner_sticky->SetPosition(gfx::PointF(0, 0));
+
+ LayerStickyPositionConstraint outer_sticky_pos;
+ outer_sticky_pos.is_sticky = true;
+ outer_sticky_pos.is_anchored_top = true;
+ outer_sticky_pos.top_offset = 10.0f;
+ outer_sticky_pos.parent_relative_sticky_box_offset = gfx::Point(0, 50);
+ outer_sticky_pos.scroll_container_relative_sticky_box_rect =
+ gfx::Rect(0, 50, 10, 50);
+ outer_sticky_pos.scroll_container_relative_containing_block_rect =
+ gfx::Rect(0, 0, 50, 400);
+ outer_sticky->SetStickyPositionConstraint(outer_sticky_pos);
+
+ LayerStickyPositionConstraint inner_sticky_pos;
+ inner_sticky_pos.is_sticky = true;
+ inner_sticky_pos.is_anchored_top = true;
+ inner_sticky_pos.top_offset = 25.0f;
+ inner_sticky_pos.parent_relative_sticky_box_offset = gfx::Point(0, 0);
+ inner_sticky_pos.scroll_container_relative_sticky_box_rect =
+ gfx::Rect(0, 50, 10, 10);
+ inner_sticky_pos.scroll_container_relative_containing_block_rect =
+ gfx::Rect(0, 50, 10, 50);
+ inner_sticky_pos.nearest_layer_shifting_containing_block = outer_sticky.get();
+ inner_sticky->SetStickyPositionConstraint(inner_sticky_pos);
+
+ ExecuteCalculateDrawProperties(root.get());
+ host()->host_impl()->CreatePendingTree();
+ host()->CommitAndCreatePendingTree();
+ host()->host_impl()->ActivateSyncTree();
+ LayerTreeImpl* layer_tree_impl = host()->host_impl()->active_tree();
+
+ LayerImpl* root_impl = layer_tree_impl->LayerById(root->id());
+ LayerImpl* scroller_impl = layer_tree_impl->LayerById(scroller->id());
+ LayerImpl* outer_sticky_impl = layer_tree_impl->LayerById(outer_sticky->id());
+ LayerImpl* inner_sticky_impl = layer_tree_impl->LayerById(inner_sticky->id());
+
+ ExecuteCalculateDrawProperties(root_impl);
+
+ // Before any scrolling is done, the sticky elements should still be at their
+ // original positions.
+ EXPECT_VECTOR2DF_EQ(
+ gfx::Vector2dF(0.f, 50.f),
+ outer_sticky_impl->ScreenSpaceTransform().To2dTranslation());
+ EXPECT_VECTOR2DF_EQ(
+ gfx::Vector2dF(0.f, 50.f),
+ inner_sticky_impl->ScreenSpaceTransform().To2dTranslation());
+
+ // Scroll less than the sticking point. Both sticky elements should move with
+ // scroll as we haven't gotten to the sticky item locations yet.
+ SetScrollOffsetDelta(scroller_impl, gfx::Vector2dF(0.f, 5.f));
+ ExecuteCalculateDrawProperties(root_impl);
+ EXPECT_VECTOR2DF_EQ(
+ gfx::Vector2dF(0.f, 45.f),
+ outer_sticky_impl->ScreenSpaceTransform().To2dTranslation());
+ EXPECT_VECTOR2DF_EQ(
+ gfx::Vector2dF(0.f, 45.f),
+ inner_sticky_impl->ScreenSpaceTransform().To2dTranslation());
+
+ // Scroll such that the inner sticky should stick, but the outer one should
+ // keep going as it hasnt reached its position yet.
+ SetScrollOffsetDelta(scroller_impl, gfx::Vector2dF(0.f, 30.f));
+ ExecuteCalculateDrawProperties(root_impl);
+ EXPECT_VECTOR2DF_EQ(
+ gfx::Vector2dF(0.f, 20.f),
+ outer_sticky_impl->ScreenSpaceTransform().To2dTranslation());
+ EXPECT_VECTOR2DF_EQ(
+ gfx::Vector2dF(0.f, 25.f),
+ inner_sticky_impl->ScreenSpaceTransform().To2dTranslation());
+
+ // Keep going, both should stick.
+ SetScrollOffsetDelta(scroller_impl, gfx::Vector2dF(0.f, 100.f));
+ ExecuteCalculateDrawProperties(root_impl);
+ EXPECT_VECTOR2DF_EQ(
+ gfx::Vector2dF(0.f, 10.f),
+ outer_sticky_impl->ScreenSpaceTransform().To2dTranslation());
+ EXPECT_VECTOR2DF_EQ(
+ gfx::Vector2dF(0.f, 25.f),
+ inner_sticky_impl->ScreenSpaceTransform().To2dTranslation());
+}
+
TEST_F(LayerTreeHostCommonTest, NonFlatContainerForFixedPosLayer) {
scoped_refptr<Layer> root = Layer::Create();
scoped_refptr<Layer> container = Layer::Create();

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