72 lines
2.3 KiB
Rust
72 lines
2.3 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 https://mozilla.org/MPL/2.0/. */
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//! A [`@position-try`][position-try] rule for Anchor Positioning.
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//!
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//! [position-try]: https://drafts.csswg.org/css-anchor-position-1/#fallback-rule
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use std::fmt::Write;
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use crate::properties::PropertyDeclarationBlock;
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use crate::shared_lock::{
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DeepCloneWithLock, Locked, SharedRwLock, SharedRwLockReadGuard, ToCssWithGuard,
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};
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use crate::str::CssStringWriter;
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use crate::values::DashedIdent;
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use cssparser::SourceLocation;
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#[cfg(feature = "gecko")]
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use malloc_size_of::{MallocSizeOf, MallocSizeOfOps, MallocUnconditionalShallowSizeOf};
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use servo_arc::Arc;
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use style_traits::{CssWriter, ToCss};
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/// A position-try rule.
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#[derive(Clone, Debug, ToShmem)]
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pub struct PositionTryRule {
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/// Name of this position-try rule.
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pub name: DashedIdent,
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/// The declaration block this position-try rule contains.
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pub block: Arc<Locked<PropertyDeclarationBlock>>,
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/// The source position this rule was found at.
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pub source_location: SourceLocation,
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}
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impl PositionTryRule {
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/// Measure heap usage.
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#[cfg(feature = "gecko")]
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pub fn size_of(&self, guard: &SharedRwLockReadGuard, ops: &mut MallocSizeOfOps) -> usize {
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self.block.unconditional_shallow_size_of(ops) + self.block.read_with(guard).size_of(ops)
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}
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}
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impl DeepCloneWithLock for PositionTryRule {
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fn deep_clone_with_lock(
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&self,
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lock: &SharedRwLock,
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guard: &SharedRwLockReadGuard,
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) -> Self {
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PositionTryRule {
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name: self.name.clone(),
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block: Arc::new(lock.wrap(self.block.read_with(&guard).clone())),
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source_location: self.source_location.clone(),
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}
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}
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}
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impl ToCssWithGuard for PositionTryRule {
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fn to_css(
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&self,
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guard: &SharedRwLockReadGuard,
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dest: &mut CssStringWriter,
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) -> std::fmt::Result {
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dest.write_str("@position-try ")?;
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self.name.to_css(&mut CssWriter::new(dest))?;
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dest.write_str(" { ")?;
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let declarations = self.block.read_with(guard);
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declarations.to_css(dest)?;
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if !declarations.is_empty() {
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dest.write_char(' ')?;
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}
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dest.write_char('}')
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}
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}
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