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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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22
components/script/dom/window.rs
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@ -74,6 +74,7 @@ use std::sync::{Arc, Mutex};
use string_cache::Atom;
use style::context::ReflowGoal;
use style::error_reporting::ParseErrorReporter;
use style::properties::longhands::{overflow_x};
use style::selector_impl::PseudoElement;
use task_source::TaskSource;
use task_source::dom_manipulation::{DOMManipulationTaskSource, DOMManipulationTask};
@ -1122,6 +1123,25 @@ impl Window {
self.layout_rpc.node_scroll_area().client_rect
}
pub fn overflow_query(&self, node: TrustedNodeAddress) -> Point2D<overflow_x::computed_value::T> {
self.reflow(ReflowGoal::ForScriptQuery,
ReflowQueryType::NodeOverflowQuery(node),
ReflowReason::Query);
self.layout_rpc.node_overflow().0.unwrap()
}
pub fn scroll_offset_query(&self, node: TrustedNodeAddress) -> Point2D<f32> {
self.reflow(ReflowGoal::ForScriptQuery,
ReflowQueryType::NodeLayerIdQuery(node),
ReflowReason::Query);
let layer_id = self.layout_rpc.node_layer_id().layer_id;
let pipeline_id = self.id;
let (send, recv) = ipc::channel::<Point2D<f32>>().unwrap();
self.compositor.send(ScriptToCompositorMsg::GetScrollOffset(pipeline_id, layer_id, send)).unwrap();
recv.recv().unwrap_or(Point2D::zero())
}
pub fn resolved_style_query(&self,
element: TrustedNodeAddress,
pseudo: Option<PseudoElement>,
@ -1476,6 +1496,8 @@ fn debug_reflow_events(id: PipelineId, goal: &ReflowGoal, query_type: &ReflowQue
ReflowQueryType::ContentBoxesQuery(_n) => "\tContentBoxesQuery",
ReflowQueryType::HitTestQuery(_n, _o) => "\tHitTestQuery",
ReflowQueryType::NodeGeometryQuery(_n) => "\tNodeGeometryQuery",
ReflowQueryType::NodeLayerIdQuery(_n) => "\tNodeLayerIdQuery",
ReflowQueryType::NodeOverflowQuery(_n) => "\tNodeOverFlowQuery",
ReflowQueryType::NodeScrollGeometryQuery(_n) => "\tNodeScrollGeometryQuery",
ReflowQueryType::ResolvedStyleQuery(_, _, _) => "\tResolvedStyleQuery",
ReflowQueryType::OffsetParentQuery(_n) => "\tOffsetParentQuery",