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
use crate::callback::Callback;
use crate::services::Task;
use std::fmt;
use stdweb::unstable::TryInto;
use stdweb::Value;
#[allow(unused_imports)]
use stdweb::{_js_impl, js};
#[must_use]
pub struct RenderTask(Option<Value>);
impl fmt::Debug for RenderTask {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.write_str("RenderTask")
}
}
#[derive(Default, Debug)]
pub struct RenderService {}
impl RenderService {
pub fn new() -> Self {
Self {}
}
pub fn request_animation_frame(&mut self, callback: Callback<f64>) -> RenderTask {
let callback = move |v| {
let time: f64 = match v {
Value::Number(n) => n.try_into().unwrap(),
_ => 0.0,
};
callback.emit(time);
};
let handle = js! {
var callback = @{callback};
var action = function(time) {
callback(time);
callback.drop();
};
return {
render_id: requestAnimationFrame(action),
callback: callback,
};
};
RenderTask(Some(handle))
}
}
impl Task for RenderTask {
fn is_active(&self) -> bool {
self.0.is_some()
}
fn cancel(&mut self) {
let handle = self.0.take().expect("tried to cancel render twice");
js! { @(no_return)
var handle = @{handle};
cancelAnimationFrame(handle.render_id);
handle.callback.drop();
}
}
}
impl Drop for RenderTask {
fn drop(&mut self) {
if self.is_active() {
self.cancel();
}
}
}