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/* 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 http://mozilla.org/MPL/2.0/. */
//! The context within which style is calculated.
use animation::Animation;
use app_units::Au;
use bloom::StyleBloom;
use dom::{OpaqueNode, TElement};
use error_reporting::ParseErrorReporter;
use euclid::Size2D;
use matching::StyleSharingCandidateCache;
use parking_lot::RwLock;
use std::collections::HashMap;
use std::sync::{Arc, Mutex};
use std::sync::mpsc::Sender;
use stylist::Stylist;
use timer::Timer;
/// This structure is used to create a local style context from a shared one.
pub struct ThreadLocalStyleContextCreationInfo {
new_animations_sender: Sender<Animation>,
}
impl ThreadLocalStyleContextCreationInfo {
pub fn new(animations_sender: Sender<Animation>) -> Self {
ThreadLocalStyleContextCreationInfo {
new_animations_sender: animations_sender,
}
}
}
#[derive(PartialEq, Eq, Copy, Clone, Hash, Debug)]
#[cfg_attr(feature = "servo", derive(HeapSizeOf))]
pub enum QuirksMode {
Quirks,
LimitedQuirks,
NoQuirks,
}
pub struct SharedStyleContext {
/// The current viewport size.
pub viewport_size: Size2D<Au>,
/// Screen sized changed?
pub screen_size_changed: bool,
/// The CSS selector stylist.
pub stylist: Arc<Stylist>,
/// Starts at zero, and increased by one every time a layout completes.
/// This can be used to easily check for invalid stale data.
pub generation: u32,
/// Why is this reflow occurring
pub goal: ReflowGoal,
/// The animations that are currently running.
pub running_animations: Arc<RwLock<HashMap<OpaqueNode, Vec<Animation>>>>,
/// The list of animations that have expired since the last style recalculation.
pub expired_animations: Arc<RwLock<HashMap<OpaqueNode, Vec<Animation>>>>,
///The CSS error reporter for all CSS loaded in this layout thread
pub error_reporter: Box<ParseErrorReporter + Sync>,
/// Data needed to create the thread-local style context from the shared one.
pub local_context_creation_data: Mutex<ThreadLocalStyleContextCreationInfo>,
/// The current timer for transitions and animations. This is needed to test
/// them.
pub timer: Timer,
/// The QuirksMode state which the document needs to be rendered with
pub quirks_mode: QuirksMode,
}
pub struct ThreadLocalStyleContext<E: TElement> {
pub style_sharing_candidate_cache: StyleSharingCandidateCache<E>,
pub bloom_filter: StyleBloom<E>,
/// A channel on which new animations that have been triggered by style
/// recalculation can be sent.
pub new_animations_sender: Sender<Animation>,
}
impl<E: TElement> ThreadLocalStyleContext<E> {
pub fn new(shared: &SharedStyleContext) -> Self {
ThreadLocalStyleContext {
style_sharing_candidate_cache: StyleSharingCandidateCache::new(),
bloom_filter: StyleBloom::new(),
new_animations_sender: shared.local_context_creation_data.lock().unwrap().new_animations_sender.clone(),
}
}
}
pub struct StyleContext<'a, E: TElement + 'a> {
pub shared: &'a SharedStyleContext,
pub thread_local: &'a mut ThreadLocalStyleContext<E>,
}
/// Why we're doing reflow.
#[derive(PartialEq, Copy, Clone, Debug)]
pub enum ReflowGoal {
/// We're reflowing in order to send a display list to the screen.
ForDisplay,
/// We're reflowing in order to satisfy a script query. No display list will be created.
ForScriptQuery,
}
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