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77 lines
3 KiB
Rust
77 lines
3 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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//! Style retrieval from DOM elements.
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use wrapper::{PseudoElementType, ThreadSafeLayoutNode};
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use std::mem;
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use style::properties::ComputedValues;
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use std::sync::Arc;
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/// Node mixin providing `style` method that returns a `NodeStyle`
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pub trait StyledNode {
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/// Returns the style results for the given node. If CSS selector matching has not yet been
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/// performed, fails.
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fn style<'a>(&'a self) -> &'a Arc<ComputedValues>;
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/// Does this node have a computed style yet?
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fn has_style(&self) -> bool;
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/// Removes the style from this node.
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fn unstyle(self);
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}
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impl<'ln> StyledNode for ThreadSafeLayoutNode<'ln> {
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#[inline]
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#[allow(unsafe_code)]
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fn style<'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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PseudoElementType::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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PseudoElementType::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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PseudoElementType::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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fn has_style(&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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fn unstyle(self) {
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let mut layout_data_ref = self.mutate_layout_data();
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let layout_data = layout_data_ref.as_mut().expect("no layout data");
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let style =
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match self.get_pseudo_element_type() {
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PseudoElementType::Before(_) => &mut layout_data.data.before_style,
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PseudoElementType::After (_) => &mut layout_data.data.after_style,
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PseudoElementType::Normal => &mut layout_data.shared_data.style,
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};
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*style = None;
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}
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}
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