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layout: Support inline incremental reflow, and stop reconstructing all

Browse source 
flows when mousing over the document.

This exposes more "jumpiness" on sites like Hacker News, but the bug
that causes it was pre-existing.
This commit is contained in:
Patrick Walton 2015-05-18 12:22:17 -07:00
parent 90aacf00f8
commit 72f031e2a1
6 changed files with 57 additions and 44 deletions
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40
components/layout/css/node_style.rs
View file

@ -4,6 +4,7 @@
//! Style retrieval from DOM elements.
use data::LayoutDataWrapper;
use wrapper::{PseudoElementType, ThreadSafeLayoutNode};
use std::mem;
@ -12,6 +13,7 @@ use std::sync::Arc;
/// Node mixin providing `style` method that returns a `NodeStyle`
pub trait StyledNode {
fn get_style<'a>(&'a self, layout_data_ref: &'a LayoutDataWrapper) -> &'a Arc<ComputedValues>;
/// Returns the style results for the given node. If CSS selector matching has not yet been
/// performed, fails.
fn style<'a>(&'a self) -> &'a Arc<ComputedValues>;
@ -22,37 +24,23 @@ pub trait StyledNode {
}
impl<'ln> StyledNode for ThreadSafeLayoutNode<'ln> {
#[inline]
fn get_style<'a>(&self, layout_data_ref: &'a LayoutDataWrapper) -> &'a Arc<ComputedValues> {
match self.get_pseudo_element_type() {
PseudoElementType::Before(_) => layout_data_ref.data.before_style.as_ref().unwrap(),
PseudoElementType::After(_) => layout_data_ref.data.after_style.as_ref().unwrap(),
PseudoElementType::Normal => layout_data_ref.shared_data.style.as_ref().unwrap(),
}
}
#[inline]
#[allow(unsafe_code)]
fn style<'a>(&'a self) -> &'a Arc<ComputedValues> {
unsafe {
let layout_data_ref = self.borrow_layout_data();
match self.get_pseudo_element_type() {
PseudoElementType::Before(_) => {
mem::transmute(layout_data_ref.as_ref()
.unwrap()
.data
.before_style
.as_ref()
.unwrap())
}
PseudoElementType::After(_) => {
mem::transmute(layout_data_ref.as_ref()
.unwrap()
.data
.after_style
.as_ref()
.unwrap())
}
PseudoElementType::Normal => {
mem::transmute(layout_data_ref.as_ref()
.unwrap()
.shared_data
.style
.as_ref()
.unwrap())
}
}
let layout_data = layout_data_ref.as_ref().expect("no layout data");
mem::transmute::<&Arc<ComputedValues>,
&'a Arc<ComputedValues>>(self.get_style(&layout_data))
}
}