animate_core/mode/
once.rs

1use crate::macros::impl_ops;
2use crate::{AnimateState, FRAME_TIME, IS_ANIMATING, Lerp};
3use std::sync::atomic::Ordering;
4
5#[derive(Debug)]
6pub struct Once<T, E, I>(pub(crate) AnimateState<T, E, I>)
7where
8    T: Lerp + PartialEq,
9    E: Fn(f64) -> f64,
10    I: Fn(&T, &T, f64) -> T;
11
12impl<T, E, I> Once<T, E, I>
13where
14    T: Lerp + PartialEq + Default,
15    E: Fn(f64) -> f64,
16    I: Fn(&T, &T, f64) -> T,
17{
18    pub fn new(initial: T, duration: f64, easing: E, interp: I) -> Self {
19        Self(AnimateState::new(initial, duration, easing, interp))
20    }
21
22    pub fn set(&mut self, target: T) {
23        let now = FRAME_TIME.load(Ordering::Relaxed);
24        let inner = self.0.inner.get_mut();
25        inner.start = std::mem::take(&mut inner.current);
26        inner.target = target;
27        inner.started_at = Some(now);
28    }
29
30    pub fn get(&self) -> &T {
31        let now = FRAME_TIME.load(Ordering::Relaxed);
32        unsafe {
33            let inner = &mut *self.0.inner.get();
34            if inner.last_update != now {
35                if let Some(start_t) = inner.started_at {
36                    let elapsed = now.saturating_sub(start_t) as f64;
37                    let t = (elapsed / self.0.duration).clamp(0.0, 1.0);
38
39                    inner.current =
40                        (self.0.interp)(&inner.start, &inner.target, (self.0.easing)(t));
41                    inner.last_update = now;
42
43                    if t >= 1.0 {
44                        inner.started_at = None;
45                    } else {
46                        IS_ANIMATING.store(true, Ordering::Relaxed);
47                    }
48                }
49            }
50            &inner.current
51        }
52    }
53
54    pub fn target(&self) -> &T {
55        unsafe {
56            let inner = &*self.0.inner.get();
57            if inner.started_at.is_none() {
58                &inner.current
59            } else {
60                &inner.target
61            }
62        }
63    }
64}
65
66impl_ops!(Once);
animate_core/mode/once.rs

animate_core/mode/
once.rs
