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use std::cell::RefCell;
use std::rc::Rc;
use std::time::Duration;
use crate::utils::get_monotonic_time;
/// Shareable lazy clock that can change rate.
///
/// The clock will fetch the time once and then retain it until explicitly cleared with
/// [`Clock::clear`].
#[derive(Debug, Default, Clone)]
pub struct Clock {
inner: Rc<RefCell<AdjustableClock>>,
}
#[derive(Debug, Default)]
struct LazyClock {
time: Option<Duration>,
}
/// Clock that can adjust its rate.
#[derive(Debug)]
struct AdjustableClock {
inner: LazyClock,
current_time: Duration,
last_seen_time: Duration,
rate: f64,
complete_instantly: bool,
}
impl Clock {
/// Creates a new clock with the given time.
pub fn with_time(time: Duration) -> Self {
let clock = AdjustableClock::new(LazyClock::with_time(time));
Self {
inner: Rc::new(RefCell::new(clock)),
}
}
/// Returns the current time.
pub fn now(&self) -> Duration {
self.inner.borrow_mut().now()
}
/// Returns the underlying time not adjusted for rate change.
pub fn now_unadjusted(&self) -> Duration {
self.inner.borrow_mut().inner.now()
}
/// Sets the unadjusted clock time.
pub fn set_unadjusted(&mut self, time: Duration) {
self.inner.borrow_mut().inner.set(time);
}
/// Clears the stored time so it's re-fetched again next.
pub fn clear(&mut self) {
self.inner.borrow_mut().inner.clear();
}
/// Gets the clock rate.
pub fn rate(&self) -> f64 {
self.inner.borrow().rate()
}
/// Sets the clock rate.
pub fn set_rate(&mut self, rate: f64) {
self.inner.borrow_mut().set_rate(rate);
}
/// Returns whether animations should complete instantly.
pub fn should_complete_instantly(&self) -> bool {
self.inner.borrow().should_complete_instantly()
}
/// Sets whether animations should complete instantly.
pub fn set_complete_instantly(&mut self, value: bool) {
self.inner.borrow_mut().set_complete_instantly(value);
}
}
impl PartialEq for Clock {
fn eq(&self, other: &Self) -> bool {
Rc::ptr_eq(&self.inner, &other.inner)
}
}
impl Eq for Clock {}
impl LazyClock {
pub fn with_time(time: Duration) -> Self {
Self { time: Some(time) }
}
pub fn clear(&mut self) {
self.time = None;
}
pub fn set(&mut self, time: Duration) {
self.time = Some(time);
}
pub fn now(&mut self) -> Duration {
*self.time.get_or_insert_with(get_monotonic_time)
}
}
impl AdjustableClock {
pub fn new(mut inner: LazyClock) -> Self {
let time = inner.now();
Self {
inner,
current_time: time,
last_seen_time: time,
rate: 1.,
complete_instantly: false,
}
}
pub fn rate(&self) -> f64 {
self.rate
}
pub fn set_rate(&mut self, rate: f64) {
self.rate = rate.clamp(0., 1000.);
}
pub fn should_complete_instantly(&self) -> bool {
self.complete_instantly
}
pub fn set_complete_instantly(&mut self, value: bool) {
self.complete_instantly = value;
}
pub fn now(&mut self) -> Duration {
let time = self.inner.now();
if self.last_seen_time == time {
return self.current_time;
}
if self.last_seen_time < time {
let delta = time - self.last_seen_time;
let delta = delta.mul_f64(self.rate);
self.current_time = self.current_time.saturating_add(delta);
} else {
let delta = self.last_seen_time - time;
let delta = delta.mul_f64(self.rate);
self.current_time = self.current_time.saturating_sub(delta);
}
self.last_seen_time = time;
self.current_time
}
}
impl Default for AdjustableClock {
fn default() -> Self {
Self::new(LazyClock::default())
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn frozen_clock() {
let mut clock = Clock::with_time(Duration::ZERO);
assert_eq!(clock.now(), Duration::ZERO);
clock.set_unadjusted(Duration::from_millis(100));
assert_eq!(clock.now(), Duration::from_millis(100));
clock.set_unadjusted(Duration::from_millis(200));
assert_eq!(clock.now(), Duration::from_millis(200));
}
#[test]
fn rate_change() {
let mut clock = Clock::with_time(Duration::ZERO);
clock.set_rate(0.5);
clock.set_unadjusted(Duration::from_millis(100));
assert_eq!(clock.now_unadjusted(), Duration::from_millis(100));
assert_eq!(clock.now(), Duration::from_millis(50));
clock.set_unadjusted(Duration::from_millis(200));
assert_eq!(clock.now_unadjusted(), Duration::from_millis(200));
assert_eq!(clock.now(), Duration::from_millis(100));
clock.set_unadjusted(Duration::from_millis(150));
assert_eq!(clock.now_unadjusted(), Duration::from_millis(150));
assert_eq!(clock.now(), Duration::from_millis(75));
clock.set_rate(2.0);
clock.set_unadjusted(Duration::from_millis(250));
assert_eq!(clock.now_unadjusted(), Duration::from_millis(250));
assert_eq!(clock.now(), Duration::from_millis(275));
}
}
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