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Trigger restyle if important rules are changed.

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If we add/remove important rules, we may need to update a list of all important
rules (in Gecko) which overrides animation properties. Therefore, we need to
set a flag if we update the primary rules which includes important ones.

If we have animations on this element, we update its effect properties, and
also send a task to update cascade results.

Calling get_properties_overriding_animations() might cases some impact
on performance because we need to walk the rule tree, so if possible, we could
just store this set into TNode to avoid finding the properties for both old
and new rules each time. This could be a future work if necessary.
This commit is contained in:
Boris Chiou 2017-05-19 16:00:52 +08:00
parent 60e7a89d57
commit 63dc43648e
5 changed files with 111 additions and 28 deletions
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19
components/style/data.rs
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@ -13,6 +13,7 @@ use properties::longhands::display::computed_value as display;
use restyle_hints::{RESTYLE_DESCENDANTS, RESTYLE_LATER_SIBLINGS, RESTYLE_SELF, RestyleHint};
use rule_tree::StrongRuleNode;
use selector_parser::{EAGER_PSEUDO_COUNT, PseudoElement, RestyleDamage};
use shared_lock::StylesheetGuards;
#[cfg(feature = "servo")] use std::collections::HashMap;
use std::fmt;
#[cfg(feature = "servo")] use std::hash::BuildHasherDefault;
@ -506,6 +507,24 @@ impl ElementData {
true
}
/// Return true if important rules are different.
/// We use this to make sure the cascade of off-main thread animations is correct.
/// Note: Ignore custom properties for now because we only support opacity and transform
/// properties for animations running on compositor. Actually, we only care about opacity
/// and transform for now, but it's fine to compare all properties and let the user
/// the check which properties do they want.
/// If it costs too much, get_properties_overriding_animations() should return a set
/// containing only opacity and transform properties.
pub fn important_rules_are_different(&self,
rules: &StrongRuleNode,
guards: &StylesheetGuards) -> bool {
debug_assert!(self.has_styles());
let (important_rules, _custom) =
self.styles().primary.rules.get_properties_overriding_animations(&guards);
let (other_important_rules, _custom) = rules.get_properties_overriding_animations(&guards);
important_rules != other_important_rules
}
/// Returns true if the Element has a RestyleData.
pub fn has_restyle(&self) -> bool {
self.restyle.is_some()