1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
|
/* 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 dom::OpaqueNode;
use error_reporting::ParseErrorReporter;
use euclid::Size2D;
use matching::{ApplicableDeclarationsCache, StyleSharingCandidateCache};
use selector_matching::Stylist;
use std::cell::RefCell;
use std::collections::HashMap;
use std::sync::mpsc::Sender;
use std::sync::{Arc, Mutex, RwLock};
use timer::Timer;
/// This structure is used to create a local style context from a shared one.
pub struct LocalStyleContextCreationInfo {
new_animations_sender: Sender<Animation>,
}
impl LocalStyleContextCreationInfo {
pub fn new(animations_sender: Sender<Animation>) -> Self {
LocalStyleContextCreationInfo {
new_animations_sender: animations_sender,
}
}
}
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 local style context from the shared one.
pub local_context_creation_data: Mutex<LocalStyleContextCreationInfo>,
/// The current timer for transitions and animations. This is needed to test
/// them.
pub timer: Timer,
}
pub struct LocalStyleContext {
pub applicable_declarations_cache: RefCell<ApplicableDeclarationsCache>,
pub style_sharing_candidate_cache: RefCell<StyleSharingCandidateCache>,
/// A channel on which new animations that have been triggered by style
/// recalculation can be sent.
pub new_animations_sender: Sender<Animation>,
}
impl LocalStyleContext {
pub fn new(local_context_creation_data: &LocalStyleContextCreationInfo) -> Self {
LocalStyleContext {
applicable_declarations_cache: RefCell::new(ApplicableDeclarationsCache::new()),
style_sharing_candidate_cache: RefCell::new(StyleSharingCandidateCache::new()),
new_animations_sender: local_context_creation_data.new_animations_sender.clone(),
}
}
}
pub trait StyleContext<'a> {
fn shared_context(&self) -> &'a SharedStyleContext;
fn local_context(&self) -> &LocalStyleContext;
}
/// 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,
}
|
