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use std::time::{Duration, Instant};
pub struct Bouncer<T> {
pub delay: Duration,
last_run: Option<Instant>,
func: Option<fn() -> T>,
result: Option<T>,
}
impl<T> Bouncer<T> {
pub fn new(delay: Duration) -> Self {
return Bouncer {
delay,
last_run: None,
func: None,
result: None,
};
}
pub fn with_func(mut self, func: fn() -> T) -> Self {
self.func = Some(func);
return self;
}
pub fn execute(&mut self) {
if self.func.is_some() {
let result = self.debounce(self.func.unwrap());
self.result = result;
}
}
pub fn get_result(&mut self) -> Option<&mut T> {
return self.result.as_mut();
}
pub fn debounce(&mut self, func: fn() -> T) -> Option<T> {
if self.last_run.is_some() {
let then = self.last_run.unwrap();
let now = Instant::now();
if now.duration_since(then) > self.delay {
self.last_run = Some(Instant::now());
return Some(func());
} else {
return None;
}
} else {
self.last_run = Some(Instant::now());
return Some(func());
}
}
pub fn reset(&mut self) {
self.last_run = None;
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn it_works() {
let delay = Duration::from_secs(1);
let mut bouncer = Bouncer::new(delay);
let result = bouncer.debounce(|| {
return 5 + 6;
});
assert_eq!(result.is_some(), true);
assert_eq!(result.unwrap(), 11);
}
#[test]
fn it_binds_internal_func() {
let func = || 5 + 6;
let delay = Duration::from_secs(1);
let mut bouncer = Bouncer::new(delay).with_func(func);
assert_eq!(bouncer.get_result().is_some(), false);
bouncer.execute();
assert_eq!(bouncer.get_result().is_some(), true);
}
#[test]
fn it_debounces() {
let delay = Duration::from_millis(100);
let mut bouncer = Bouncer::new(delay);
let func = || {
return 5 + 6;
};
let result1 = bouncer.debounce(func);
let result2 = bouncer.debounce(func);
std::thread::sleep(Duration::from_millis(101));
let result3 = bouncer.debounce(func);
assert_eq!(result1.is_some(), true);
assert_eq!(result2.is_none(), true);
assert_eq!(result3.is_some(), true);
}
}