/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at
https://mozilla.org/MPL/2.0/. */
//! A set of author stylesheets and their computed representation, such as the
//! ones used for ShadowRoot.
use crate::dom::TElement;
use crate::invalidation::media_queries::ToMediaListKey;
use crate::shared_lock::SharedRwLockReadGuard;
use crate::stylesheet_set::AuthorStylesheetSet;
use crate::stylesheets::StylesheetInDocument;
use crate::stylist::CascadeData;
use crate::stylist::Stylist;
use servo_arc::Arc;
/// A set of author stylesheets and their computed representation, such as the
/// ones used for ShadowRoot.
#[derive(MallocSizeOf)]
pub struct GenericAuthorStyles<S>
where
S: StylesheetInDocument + PartialEq + 'static,
{
/// The sheet collection, which holds the sheet pointers, the invalidations,
/// and all that stuff.
pub stylesheets: AuthorStylesheetSet<S>,
/// The actual cascade data computed from the stylesheets.
#[ignore_malloc_size_of = "Measured as part of the stylist"]
pub data: Arc<CascadeData>,
}
pub use self::GenericAuthorStyles as AuthorStyles;
lazy_static! {
static ref EMPTY_CASCADE_DATA: Arc<CascadeData> = Arc::new_leaked(CascadeData::new());
}
impl<S> GenericAuthorStyles<S>
where
S: StylesheetInDocument + PartialEq + 'static,
{
/// Create an empty AuthorStyles.
#[inline]
pub fn new() -> Self {
Self {
stylesheets: AuthorStylesheetSet::new(),
data: EMPTY_CASCADE_DATA.clone(),
}
}
/// Flush the pending sheet changes, updating `data` as appropriate.
///
/// TODO(emilio): Need a host element and a snapshot map to do invalidation
/// properly.
#[inline]
pub fn flush<E>(&mut self, stylist: &mut Stylist, guard: &SharedRwLockReadGuard)
where
E: TElement,
S: ToMediaListKey,
{
let flusher = self
.stylesheets
.flush::<E>(/* host = */ None, /* snapshot_map = */ None);
let result = stylist.rebuild_author_data(&self.data, flusher.sheets, guard);
if let Ok(Some(new_data)) = result {
self.data = new_data;
}
}
}
