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layout: Make child stacking contexts of fixed position stacking contexts

Browse source 
also fixed position.

Improves YouTube.
Improves the Washington Post.

Closes #10526.
This commit is contained in:
Patrick Walton 2016-04-11 13:35:35 -07:00
parent b214205ba9
commit 8cc3e0660b
2 changed files with 24 additions and 8 deletions
Download patch file Download diff file Expand all files Collapse all files

25
components/layout/webrender_helpers.rs
View file

@ -28,6 +28,7 @@ trait WebRenderStackingContextConverter {
pipeline_id: webrender_traits::PipelineId,
epoch: webrender_traits::Epoch,
scroll_layer_id: Option<webrender_traits::ScrollLayerId>,
scroll_policy: ScrollPolicy,
frame_builder: &mut WebRenderFrameBuilder)
-> webrender_traits::StackingContextId;
@ -37,6 +38,7 @@ trait WebRenderStackingContextConverter {
pipeline_id: webrender_traits::PipelineId,
epoch: webrender_traits::Epoch,
scroll_layer_id: Option<webrender_traits::ScrollLayerId>,
scroll_policy: ScrollPolicy,
builder: &mut webrender_traits::DisplayListBuilder,
frame_builder: &mut WebRenderFrameBuilder,
force_positioned_stacking_level: bool);
@ -276,6 +278,7 @@ impl WebRenderStackingContextConverter for StackingContext {
pipeline_id: webrender_traits::PipelineId,
epoch: webrender_traits::Epoch,
scroll_layer_id: Option<webrender_traits::ScrollLayerId>,
scroll_policy: ScrollPolicy,
builder: &mut webrender_traits::DisplayListBuilder,
frame_builder: &mut WebRenderFrameBuilder,
force_positioned_stacking_level: bool) {
@ -295,6 +298,7 @@ impl WebRenderStackingContextConverter for StackingContext {
pipeline_id,
epoch,
None,
scroll_policy,
frame_builder);
builder.push_stacking_context(child.web_render_stacking_level(),
stacking_context_id);
@ -304,6 +308,7 @@ impl WebRenderStackingContextConverter for StackingContext {
pipeline_id,
epoch,
scroll_layer_id,
scroll_policy,
builder,
frame_builder,
true);
@ -323,19 +328,21 @@ impl WebRenderStackingContextConverter for StackingContext {
pipeline_id: webrender_traits::PipelineId,
epoch: webrender_traits::Epoch,
scroll_layer_id: Option<webrender_traits::ScrollLayerId>,
mut scroll_policy: ScrollPolicy,
frame_builder: &mut WebRenderFrameBuilder)
-> webrender_traits::StackingContextId {
let scroll_policy = self.layer_info
.map_or(webrender_traits::ScrollPolicy::Scrollable, |info| {
match info.scroll_policy {
ScrollPolicy::Scrollable => webrender_traits::ScrollPolicy::Scrollable,
ScrollPolicy::FixedPosition => webrender_traits::ScrollPolicy::Fixed,
}
});
if let Some(ref layer_info) = self.layer_info {
scroll_policy = layer_info.scroll_policy
}
let webrender_scroll_policy = match scroll_policy {
ScrollPolicy::Scrollable => webrender_traits::ScrollPolicy::Scrollable,
ScrollPolicy::FixedPosition => webrender_traits::ScrollPolicy::Fixed,
};
let mut sc =
webrender_traits::StackingContext::new(scroll_layer_id,
scroll_policy,
webrender_scroll_policy,
self.bounds.to_rectf(),
self.overflow.to_rectf(),
self.z_index,
@ -351,6 +358,7 @@ impl WebRenderStackingContextConverter for StackingContext {
pipeline_id,
epoch,
scroll_layer_id,
scroll_policy,
&mut builder,
frame_builder,
false);
@ -386,6 +394,7 @@ impl WebRenderDisplayListConverter for DisplayList {
pipeline_id,
epoch,
scroll_layer_id,
ScrollPolicy::Scrollable,
frame_builder)
}
}

7
tests/html/nested-fixed-position.html Normal file
View file

@ -0,0 +1,7 @@
<!DOCTYPE html>
<body style="height: 2000px; background: linear-gradient(to bottom, white, black)">
<div style="position: fixed; top: 0; right: 0; left: 0;">
<div style="position: absolute; left: 0; right: 0; height: 40px; overflow: hidden;">
This text should <em>not</em> scroll.
</div>
</div>