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Cache the result of retrieving an element's client rectangle from layout.

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This commit is contained in:
Josh Matthews 2020-03-26 16:07:29 -04:00
parent 148c24c29c
commit 6ab7a50b31
5 changed files with 125 additions and 22 deletions
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23
components/script/dom/element.rs
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@ -85,6 +85,7 @@ use crate::stylesheet_loader::StylesheetOwner;
use crate::task::TaskOnce;
use devtools_traits::AttrInfo;
use dom_struct::dom_struct;
use euclid::default::Rect;
use html5ever::serialize;
use html5ever::serialize::SerializeOpts;
use html5ever::serialize::TraversalScope;
@ -2438,22 +2439,22 @@ impl ElementMethods for Element {
// https://drafts.csswg.org/cssom-view/#dom-element-clienttop
fn ClientTop(&self) -> i32 {
self.upcast::<Node>().client_rect().origin.y
self.client_rect().origin.y
}
// https://drafts.csswg.org/cssom-view/#dom-element-clientleft
fn ClientLeft(&self) -> i32 {
self.upcast::<Node>().client_rect().origin.x
self.client_rect().origin.x
}
// https://drafts.csswg.org/cssom-view/#dom-element-clientwidth
fn ClientWidth(&self) -> i32 {
self.upcast::<Node>().client_rect().size.width
self.client_rect().size.width
}
// https://drafts.csswg.org/cssom-view/#dom-element-clientheight
fn ClientHeight(&self) -> i32 {
self.upcast::<Node>().client_rect().size.height
self.client_rect().size.height
}
/// <https://w3c.github.io/DOM-Parsing/#widl-Element-innerHTML>
@ -3206,6 +3207,20 @@ impl<'a> SelectorsElement for DomRoot<Element> {
}
impl Element {
fn client_rect(&self) -> Rect<i32> {
if let Some(rect) = self
.rare_data()
.as_ref()
.and_then(|data| data.client_rect.as_ref())
.and_then(|rect| rect.get().ok())
{
return rect;
}
let rect = self.upcast::<Node>().client_rect();
self.ensure_rare_data().client_rect = Some(window_from_node(self).cache_layout_value(rect));
rect
}
pub fn as_maybe_activatable(&self) -> Option<&dyn Activatable> {
let element = match self.upcast::<Node>().type_id() {
NodeTypeId::Element(ElementTypeId::HTMLElement(