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Introduce the LayoutIterator newtype and return it for all children() methods in style and layout.

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This commit is contained in:
Bobby Holley 2016-09-20 17:25:38 -07:00
parent e6bbff110a
commit 4aa3e589c0
4 changed files with 25 additions and 16 deletions
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10
components/style/dom.rs
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@ -73,6 +73,14 @@ pub trait NodeInfo {
fn is_text_node(&self) -> bool;
}
pub struct LayoutIterator<T>(pub T);
impl<T, I> Iterator for LayoutIterator<T> where T: Iterator<Item=I>, I: NodeInfo {
type Item = I;
fn next(&mut self) -> Option<I> {
self.0.next()
}
}
pub trait TNode : Sized + Copy + Clone + NodeInfo {
type ConcreteElement: TElement<ConcreteNode = Self, ConcreteDocument = Self::ConcreteDocument>;
type ConcreteDocument: TDocument<ConcreteNode = Self, ConcreteElement = Self::ConcreteElement>;
@ -87,7 +95,7 @@ pub trait TNode : Sized + Copy + Clone + NodeInfo {
fn dump_style(self);
/// Returns an iterator over this node's children.
fn children(self) -> Self::ConcreteChildrenIterator;
fn children(self) -> LayoutIterator<Self::ConcreteChildrenIterator>;
/// Converts self into an `OpaqueNode`.
fn opaque(&self) -> OpaqueNode;