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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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16
components/layout/wrapper.rs
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@ -34,6 +34,7 @@ use core::nonzero::NonZero;
use data::{LayoutDataFlags, PrivateLayoutData};
use gfx::display_list::OpaqueNode;
use gfx::text::glyph::CharIndex;
use gfx_traits::{LayerId, LayerType};
use incremental::RestyleDamage;
use msg::constellation_msg::PipelineId;
use opaque_node::OpaqueNodeMethods;
@ -851,6 +852,21 @@ pub trait ThreadSafeLayoutNode : Clone + Copy + Sized + PartialEq {
fn iframe_pipeline_id(&self) -> PipelineId;
fn get_colspan(&self) -> u32;
fn layer_id(&self) -> LayerId {
let layer_type = match self.get_pseudo_element_type() {
PseudoElementType::Normal => LayerType::FragmentBody,
PseudoElementType::Before(_) => LayerType::BeforePseudoContent,
PseudoElementType::After(_) => LayerType::AfterPseudoContent,
PseudoElementType::DetailsSummary(_) => LayerType::FragmentBody,
PseudoElementType::DetailsContent(_) => LayerType::FragmentBody,
};
LayerId::new_of_type(layer_type, self.opaque().id() as usize)
}
fn layer_id_for_overflow_scroll(&self) -> LayerId {
LayerId::new_of_type(LayerType::OverflowScroll, self.opaque().id() as usize)
}
}
// This trait is only public so that it can be implemented by the gecko wrapper.