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style: Add TNode::children_and_traversal_children_might_differ.

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This will be used to optimize out traversing the real DOM children when
propagating restyle hints.
This commit is contained in:
Cameron McCormack 2017-06-09 13:43:52 +08:00
parent c533097e20
commit 719709f0d5
3 changed files with 15 additions and 0 deletions
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4
components/style/dom.rs
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@ -126,6 +126,10 @@ pub trait TNode : Sized + Copy + Clone + Debug + NodeInfo {
/// Get this node's children from the perspective of a restyle traversal.
fn traversal_children(&self) -> LayoutIterator<Self::ConcreteChildrenIterator>;
/// Returns whether `children()` and `traversal_children()` might return
/// iterators over different nodes.
fn children_and_traversal_children_might_differ(&self) -> bool;
/// Converts self into an `OpaqueNode`.
fn opaque(&self) -> OpaqueNode;

5
components/style/gecko/wrapper.rs
View file

@ -34,6 +34,7 @@ use gecko_bindings::bindings::{Gecko_IsRootElement, Gecko_MatchesElement, Gecko_
use gecko_bindings::bindings::{Gecko_SetNodeFlags, Gecko_UnsetNodeFlags};
use gecko_bindings::bindings::Gecko_ClassOrClassList;
use gecko_bindings::bindings::Gecko_ElementHasAnimations;
use gecko_bindings::bindings::Gecko_ElementHasBindingWithAnonymousContent;
use gecko_bindings::bindings::Gecko_ElementHasCSSAnimations;
use gecko_bindings::bindings::Gecko_ElementHasCSSTransitions;
use gecko_bindings::bindings::Gecko_GetActiveLinkAttrDeclarationBlock;
@ -271,6 +272,10 @@ impl<'ln> TNode for GeckoNode<'ln> {
}
}
fn children_and_traversal_children_might_differ(&self) -> bool {
self.as_element().map_or(false, |e| unsafe { Gecko_ElementHasBindingWithAnonymousContent(e.0) })
}
fn opaque(&self) -> OpaqueNode {
let ptr: usize = self.0 as *const _ as usize;
OpaqueNode(ptr)