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style: Introduce a TDocument trait.

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This will be useful for querySelector optimizations.
This commit is contained in:
Emilio Cobos Álvarez 2017-10-26 12:48:59 +02:00
parent 6c796b50ec
commit 4d4fa69018
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3 changed files with 58 additions and 9 deletions
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15
components/style/dom.rs
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@ -133,12 +133,24 @@ where
}
}
/// The `TDocument` trait, to represent a document node.
pub trait TDocument : Sized + Copy + Clone {
/// The concrete `TNode` type.
type ConcreteNode: TNode<ConcreteDocument = Self>;
/// Get this document as a `TNode`.
fn as_node(&self) -> Self::ConcreteNode;
}
/// The `TNode` trait. This is the main generic trait over which the style
/// system can be implemented.
pub trait TNode : Sized + Copy + Clone + Debug + NodeInfo + PartialEq {
/// The concrete `TElement` type.
type ConcreteElement: TElement<ConcreteNode = Self>;
/// The concrete `TDocument` type.
type ConcreteDocument: TDocument<ConcreteNode = Self>;
/// Get this node's parent node.
fn parent_node(&self) -> Option<Self>;
@ -211,6 +223,9 @@ pub trait TNode : Sized + Copy + Clone + Debug + NodeInfo + PartialEq {
/// Get this node as an element, if it's one.
fn as_element(&self) -> Option<Self::ConcreteElement>;
/// Get this node as a document, if it's one.
fn as_document(&self) -> Option<Self::ConcreteDocument>;
/// Whether this node can be fragmented. This is used for multicol, and only
/// for Servo.
fn can_be_fragmented(&self) -> bool;