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style: Define a CascadeLevel enum, and make the rule tree operate on it.

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We'll use this level to know where to stop replacing nodes in the tree.
This commit is contained in:
Emilio Cobos Álvarez 2017-01-29 02:59:54 +01:00
parent 31ecc9b692
commit 314f2ce714
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6 changed files with 144 additions and 64 deletions
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12
components/style/matching.rs
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@ -573,7 +573,7 @@ fn compute_rule_node<E: TElement>(context: &StyleContext<E>,
applicable_declarations: &mut Vec<ApplicableDeclarationBlock>)
-> StrongRuleNode
{
let rules = applicable_declarations.drain(..).map(|d| (d.source, d.importance));
let rules = applicable_declarations.drain(..).map(|d| (d.source, d.level));
let rule_node = context.shared.stylist.rule_tree.insert_ordered_rules(rules);
rule_node
}
@ -583,10 +583,14 @@ impl<E: TElement> PrivateMatchMethods for E {}
/// The public API that elements expose for selector matching.
pub trait MatchMethods : TElement {
/// Runs selector matching of this element, and returns the result.
fn match_element(&self, context: &StyleContext<Self>, parent_bf: Option<&BloomFilter>)
fn match_element(&self,
context: &StyleContext<Self>,
parent_bf: Option<&BloomFilter>)
-> MatchResults
{
let mut applicable_declarations: Vec<ApplicableDeclarationBlock> = Vec::with_capacity(16);
let mut applicable_declarations =
Vec::<ApplicableDeclarationBlock>::with_capacity(16);
let stylist = &context.shared.stylist;
let style_attribute = self.style_attribute();
let animation_rules = self.get_animation_rules(None);
@ -609,7 +613,7 @@ pub trait MatchMethods : TElement {
let pseudo_animation_rules = self.get_animation_rules(Some(&pseudo));
stylist.push_applicable_declarations(self, parent_bf, None,
pseudo_animation_rules,
Some(&pseudo.clone()),
Some(&pseudo),
&mut applicable_declarations,
MatchingReason::ForStyling);