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Implement ScrollTop and ScrollLeft getters:

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Add new compositor message to get scroll_offset;
Add new layout query for computed value of overflow-x/y;
Implement layer_id method for ThreadSafeLayoutNode;
Add new layout query for layer_id;
Implement script interface for getting scrollTop and scrollLeft, as well as relavant helper functions.
This commit is contained in:
Zhen Zhang 2016-04-03 15:41:37 +08:00
parent f73c6143d5
commit fefdaf76de
12 changed files with 243 additions and 9 deletions
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10
components/compositing/compositor.rs
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@ -714,6 +714,16 @@ impl<Window: WindowMethods> IOCompositor<Window> {
let _ = sender.send(());
}
(Msg::GetScrollOffset(pipeline_id, layer_id, sender), ShutdownState::NotShuttingDown) => {
match self.find_layer_with_pipeline_and_layer_id(pipeline_id, layer_id) {
Some(ref layer) => {
let typed = layer.extra_data.borrow().scroll_offset;
let _ = sender.send(Point2D::new(typed.x.get(), typed.y.get()));
},
None => {},
}
}
// When we are shutting_down, we need to avoid performing operations
// such as Paint that may crash because we have begun tearing down
// the rest of our resources.