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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/. */
use animation::Animation;
use app_units::Au;
use dom::OpaqueNode;
use error_reporting::ParseErrorReporter;
use euclid::Size2D;
use matching::{ApplicableDeclarationsCache, StyleSharingCandidateCache};
use properties::ComputedValues;
use selector_impl::SelectorImplExt;
use selector_matching::Stylist;
use std::cell::RefCell;
use std::collections::HashMap;
use std::sync::mpsc::Sender;
use std::sync::{Arc, Mutex, RwLock};
pub struct SharedStyleContext<Impl: SelectorImplExt> {
/// 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<Impl>>,
/// 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,
/// A channel on which new animations that have been triggered by style recalculation can be
/// sent.
pub new_animations_sender: Mutex<Sender<Animation>>,
/// 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>,
}
pub struct LocalStyleContext<C: ComputedValues> {
pub applicable_declarations_cache: RefCell<ApplicableDeclarationsCache<C>>,
pub style_sharing_candidate_cache: RefCell<StyleSharingCandidateCache<C>>,
}
pub trait StyleContext<'a, Impl: SelectorImplExt> {
fn shared_context(&self) -> &'a SharedStyleContext<Impl>;
fn local_context(&self) -> &LocalStyleContext<Impl::ComputedValues>;
}
/// 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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