1use std::time::Duration;
 2
 3use futures::{channel::oneshot, FutureExt};
 4use gpui::{Task, ViewContext};
 5
 6use crate::Editor;
 7
 8pub struct DebouncedDelay {
 9    task: Option<Task<()>>,
10    cancel_channel: Option<oneshot::Sender<()>>,
11}
12
13impl DebouncedDelay {
14    pub fn new() -> DebouncedDelay {
15        DebouncedDelay {
16            task: None,
17            cancel_channel: None,
18        }
19    }
20
21    pub fn fire_new<F>(&mut self, delay: Duration, cx: &mut ViewContext<Editor>, func: F)
22    where
23        F: 'static + Send + FnOnce(&mut Editor, &mut ViewContext<Editor>) -> Task<()>,
24    {
25        if let Some(channel) = self.cancel_channel.take() {
26            _ = channel.send(());
27        }
28
29        let (sender, mut receiver) = oneshot::channel::<()>();
30        self.cancel_channel = Some(sender);
31
32        drop(self.task.take());
33        self.task = Some(cx.spawn(move |model, mut cx| async move {
34            let mut timer = cx.background_executor().timer(delay).fuse();
35            futures::select_biased! {
36                _ = receiver => return,
37                _ = timer => {}
38            }
39
40            if let Ok(task) = model.update(&mut cx, |project, cx| (func)(project, cx)) {
41                task.await;
42            }
43        }));
44    }
45}