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Auto merge of #10513 - frewsxcv:is_the_html_body_element, r=Ms2ger

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Extract out 'is the html body element' CSSOM concept.

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This commit is contained in:
bors-servo 2016-04-11 20:36:31 +05:30
commit f9f3b7529b
2 changed files with 12 additions and 6 deletions
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10
components/script/dom/htmlbodyelement.rs
View file

@ -47,6 +47,16 @@ impl HTMLBodyElement {
let element = HTMLBodyElement::new_inherited(localName, prefix, document);
Node::reflect_node(box element, document, HTMLBodyElementBinding::Wrap)
}
/// https://drafts.csswg.org/cssom-view/#the-html-body-element
pub fn is_the_html_body_element(&self) -> bool {
let self_node = self.upcast::<Node>();
let root_elem = self.upcast::<Element>().root_element();
let root_node = root_elem.upcast::<Node>();
root_node.is_parent_of(self_node) &&
self_node.preceding_siblings().all(|n| !n.is::<HTMLBodyElement>())
}
}
impl HTMLBodyElementMethods for HTMLBodyElement {

8
components/script/dom/node.rs
View file

@ -594,12 +594,8 @@ impl Node {
let html_element = document.GetDocumentElement();
let is_body_element = html_element.r().and_then(|root| {
let node = root.upcast::<Node>();
node.children().find(|child| { child.is::<HTMLBodyElement>() }).map(|node| {
*node.r() == *self
})
}).unwrap_or(false);
let is_body_element = self.downcast::<HTMLBodyElement>()
.map_or(false, |e| e.is_the_html_body_element());
let scroll_area = window.scroll_area_query(self.to_trusted_node_address());