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Rearrange some data structures in preparation for the new incremental restyle algorithm.

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MozReview-Commit-ID: 8iOALQylOuK
This commit is contained in:
Bobby Holley 2016-10-06 23:23:18 -07:00
parent 6d29bf3f80
commit adf0fe9b9a
14 changed files with 333 additions and 219 deletions
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32
components/style/dom.rs
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@ -6,7 +6,8 @@
#![allow(unsafe_code)]
use data::PseudoStyles;
use atomic_refcell::{AtomicRef, AtomicRefMut};
use data::NodeData;
use element_state::ElementState;
use parking_lot::RwLock;
use properties::{ComputedValues, PropertyDeclarationBlock};
@ -140,29 +141,18 @@ pub trait TNode : Sized + Copy + Clone + NodeInfo {
/// traversal. Returns the number of children left to process.
fn did_process_child(&self) -> isize;
/// Returns the computed style values corresponding to the existing style
/// for this node, if any.
///
/// This returns an cloned Arc (rather than a borrow) to abstract over the
/// multitude of ways these values may be stored under the hood. By
/// returning an enum with various OwningRef/OwningHandle entries, we could
/// avoid the refcounting traffic here, but it's probably not worth the
/// complexity.
fn get_existing_style(&self) -> Option<Arc<ComputedValues>>;
/// Sets up the appropriate data structures to style a node, returing a
/// mutable handle to the node data upon which further style calculations
/// can be performed.
fn begin_styling(&self) -> AtomicRefMut<NodeData>;
/// Sets the computed style for this node.
fn set_style(&self, style: Arc<ComputedValues>);
/// Transfers ownership of the existing pseudo styles, if any, to the
/// caller. The stored pseudo styles are replaced with an empty map.
fn take_pseudo_styles(&self) -> PseudoStyles;
/// Sets the pseudo styles on the element, replacing any existing styles.
fn set_pseudo_styles(&self, styles: PseudoStyles);
/// Set the style for a text node.
/// Set the style directly for a text node. This skips various unnecessary
/// steps from begin_styling like computing the previous style.
fn style_text_node(&self, style: Arc<ComputedValues>);
/// Immutable borrows the NodeData.
fn borrow_data(&self) -> Option<AtomicRef<NodeData>>;
/// Get the description of how to account for recent style changes.
fn restyle_damage(self) -> Self::ConcreteRestyleDamage;