style/stylesheets/
starting_style_rule.rs

1/* This Source Code Form is subject to the terms of the Mozilla Public
2 * License, v. 2.0. If a copy of the MPL was not distributed with this
3 * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
4
5//! before-change style: the `@starting-style` rules.
6//! https://drafts.csswg.org/css-transitions-2/#defining-before-change-style
7
8use crate::derives::*;
9use crate::shared_lock::{DeepCloneWithLock, Locked};
10use crate::shared_lock::{SharedRwLock, SharedRwLockReadGuard, ToCssWithGuard};
11use crate::stylesheets::CssRules;
12use cssparser::SourceLocation;
13#[cfg(feature = "gecko")]
14use malloc_size_of::{MallocSizeOfOps, MallocUnconditionalShallowSizeOf};
15use servo_arc::Arc;
16use std::fmt::{self, Debug, Write};
17use style_traits::CssStringWriter;
18
19/// A [`@starting-style`][starting-style] rule.
20///
21/// [starting-style]: https://drafts.csswg.org/css-transitions-2/#at-ruledef-starting-style
22#[derive(Debug, ToShmem)]
23pub struct StartingStyleRule {
24    /// The nested rules to this starting-style rule.
25    pub rules: Arc<Locked<CssRules>>,
26    /// The source position where this starting-style rule was found.
27    pub source_location: SourceLocation,
28}
29
30impl StartingStyleRule {
31    /// Measure heap usage.
32    #[cfg(feature = "gecko")]
33    pub fn size_of(&self, guard: &SharedRwLockReadGuard, ops: &mut MallocSizeOfOps) -> usize {
34        self.rules.unconditional_shallow_size_of(ops)
35            + self.rules.read_with(guard).size_of(guard, ops)
36    }
37}
38
39impl ToCssWithGuard for StartingStyleRule {
40    fn to_css(&self, guard: &SharedRwLockReadGuard, dest: &mut CssStringWriter) -> fmt::Result {
41        dest.write_str("@starting-style")?;
42        self.rules.read_with(guard).to_css_block(guard, dest)
43    }
44}
45
46impl DeepCloneWithLock for StartingStyleRule {
47    fn deep_clone_with_lock(&self, lock: &SharedRwLock, guard: &SharedRwLockReadGuard) -> Self {
48        let rules = self.rules.read_with(guard);
49        StartingStyleRule {
50            rules: Arc::new(lock.wrap(rules.deep_clone_with_lock(lock, guard))),
51            source_location: self.source_location.clone(),
52        }
53    }
54}
style/stylesheets/starting_style_rule.rs

style/stylesheets/
starting_style_rule.rs
