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style: Separate the XBL and shadow dom styling bits.

Browse source 
Bug: 1441022
Reviewed-by: xidorn
MozReview-Commit-ID: 2W0BmZ8wWXg
This commit is contained in:
Emilio Cobos Álvarez 2018-03-05 12:50:04 +01:00
parent 3b96fb2cbe
commit ef4ea7cc49
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GPG key ID: 056B727BB9C1027C
7 changed files with 107 additions and 57 deletions
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21
components/style/dom.rs
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@ -330,6 +330,11 @@ pub trait TShadowRoot : Sized + Copy + Clone {
/// Get the shadow host that hosts this ShadowRoot.
fn host(&self) -> <Self::ConcreteNode as TNode>::ConcreteElement;
/// Get the style data for this ShadowRoot.
fn style_data<'a>(&self) -> &'a CascadeData
where
Self: 'a;
}
/// The element trait, the main abstraction the style crate acts over.
@ -760,7 +765,8 @@ pub trait TElement
/// Implements Gecko's `nsBindingManager::WalkRules`.
///
/// Returns whether to cut off the inheritance.
/// Returns whether to cut off the binding inheritance, that is, whether
/// document rules should _not_ apply.
fn each_xbl_cascade_data<'a, F>(&self, _: F) -> bool
where
Self: 'a,
@ -778,15 +784,22 @@ pub trait TElement
Self: 'a,
F: FnMut(&'a CascadeData, QuirksMode),
{
let cut_off_inheritance = self.each_xbl_cascade_data(&mut f);
let mut doc_rules_apply = !self.each_xbl_cascade_data(&mut f);
if let Some(shadow) = self.containing_shadow() {
doc_rules_apply = false;
f(shadow.style_data(), self.as_node().owner_doc().quirks_mode());
}
let mut current = self.assigned_slot();
while let Some(slot) = current {
slot.each_xbl_cascade_data(&mut f);
// Slots can only have assigned nodes when in a shadow tree.
let data = slot.containing_shadow().unwrap().style_data();
f(data, self.as_node().owner_doc().quirks_mode());
current = slot.assigned_slot();
}
cut_off_inheritance
doc_rules_apply
}
/// Does a rough (and cheap) check for whether or not transitions might need to be updated that