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90 lines
3.5 KiB
Rust
90 lines
3.5 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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use incremental::RestyleDamage;
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use util::LayoutDataAccess;
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use wrapper::{TLayoutNode, ThreadSafeLayoutNode};
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use wrapper::{After, Before, Normal};
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use std::mem;
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use style::ComputedValues;
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use sync::Arc;
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pub trait NodeUtil {
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fn get_css_select_results<'a>(&'a self) -> &'a Arc<ComputedValues>;
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fn have_css_select_results(&self) -> bool;
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fn get_restyle_damage(&self) -> RestyleDamage;
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fn set_restyle_damage(&self, damage: RestyleDamage);
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}
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impl<'ln> NodeUtil for ThreadSafeLayoutNode<'ln> {
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/// Returns the style results for the given node. If CSS selector
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/// matching has not yet been performed, fails.
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#[inline]
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fn get_css_select_results<'a>(&'a self) -> &'a Arc<ComputedValues> {
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unsafe {
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let layout_data_ref = self.borrow_layout_data();
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match self.get_pseudo_element_type() {
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Before(_) => {
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mem::transmute(layout_data_ref.as_ref()
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.unwrap()
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.data
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.before_style
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.as_ref()
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.unwrap())
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}
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After(_) => {
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mem::transmute(layout_data_ref.as_ref()
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.unwrap()
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.data
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.after_style
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.as_ref()
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.unwrap())
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}
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Normal => {
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mem::transmute(layout_data_ref.as_ref()
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.unwrap()
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.shared_data
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.style
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.as_ref()
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.unwrap())
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}
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}
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}
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}
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/// Does this node have a computed style yet?
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fn have_css_select_results(&self) -> bool {
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let layout_data_ref = self.borrow_layout_data();
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layout_data_ref.as_ref().unwrap().shared_data.style.is_some()
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}
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/// Get the description of how to account for recent style changes.
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/// This is a simple bitfield and fine to copy by value.
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fn get_restyle_damage(&self) -> RestyleDamage {
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// For DOM elements, if we haven't computed damage yet, assume the worst.
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// Other nodes don't have styles.
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let default = if self.node_is_element() {
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RestyleDamage::all()
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} else {
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RestyleDamage::empty()
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};
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let layout_data_ref = self.borrow_layout_data();
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layout_data_ref
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.as_ref().unwrap()
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.data
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.restyle_damage
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.unwrap_or(default)
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}
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/// Set the restyle damage field.
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fn set_restyle_damage(&self, damage: RestyleDamage) {
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let mut layout_data_ref = self.mutate_layout_data();
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match &mut *layout_data_ref {
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&Some(ref mut layout_data) => layout_data.data.restyle_damage = Some(damage),
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_ => fail!("no layout data for this node"),
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}
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}
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}
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