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Split getter for mutation_observers() into two methods.

Browse source 
registered_mutation_observers() returns immutable references and does
not init mutation observers.

registered_mutation_observers_mut() lazily initializes raredata if it
does not exist.

Updated code that uses this methods to call appropriate method when
mutation is not necessary.
This commit is contained in:
gatowololo 2019-06-06 11:30:37 -07:00
parent fe8aad7227
commit 3df8d6891e
2 changed files with 21 additions and 9 deletions
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21
components/script/dom/node.rs
View file

@ -451,18 +451,25 @@ impl Node {
cmp & NodeConstants::DOCUMENT_POSITION_PRECEDING != 0
}
/// Return all registered mutation observers for this node.
/// XXX(ferjm) This should probably be split into two functions,
/// `registered_mutation_observers`, which returns an Option or
/// an empty slice or something, and doesn't create the rare data,
/// and `registered_mutation_observers_mut`, which does lazily
/// initialize the raredata.
pub fn registered_mutation_observers(&self) -> RefMut<Vec<RegisteredObserver>> {
/// Return all registered mutation observers for this node. Lazily initialize the
/// raredata if it does not exist.
pub fn registered_mutation_observers_mut(&self) -> RefMut<Vec<RegisteredObserver>> {
RefMut::map(self.ensure_rare_data(), |rare_data| {
&mut rare_data.mutation_observers
})
}
pub fn registered_mutation_observers(&self) -> Option<Ref<Vec<RegisteredObserver>>> {
let rare_data: Ref<_> = self.rare_data.borrow();
if rare_data.is_none() {
return None;
}
Some(Ref::map(rare_data, |rare_data| {
&rare_data.as_ref().unwrap().mutation_observers
}))
}
/// Add a new mutation observer for a given node.
pub fn add_mutation_observer(&self, observer: RegisteredObserver) {
self.ensure_rare_data().mutation_observers.push(observer);