66 lines
2.0 KiB
Rust
66 lines
2.0 KiB
Rust
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/// Inspired by https://github.com/orhun/rust-tui-template/blob/472aa515119d4c94903eac12d9784417281dc7f5/src/event.rs
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use crossterm::event;
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use std::time::{Duration, Instant};
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use tokio::sync::{broadcast, mpsc};
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/// Events
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#[derive(Debug)]
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pub(crate) enum Event {
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/// Terminal tick.
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Tick,
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/// Key press.
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Key(event::KeyEvent),
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/// Terminal resize.
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Resize(u16, u16),
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}
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pub(crate) async fn terminal_event_task(
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fps: u32,
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event_sender: mpsc::Sender<Event>,
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mut shutdown_receiver: broadcast::Receiver<()>,
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_shutdown_guard_sender: mpsc::Sender<()>,
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) {
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// End task if a message is received on shutdown_receiver
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// _shutdown_guard_sender will be dropped once the task is finished
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tokio::select! {
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_ = event_loop(fps, event_sender) => {
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},
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_ = shutdown_receiver.recv() => {}
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}
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}
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/// Main event loop
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async fn event_loop(fps: u32, event_sender: mpsc::Sender<Event>) {
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// Frame budget
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let per_frame = Duration::from_secs(1) / fps;
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// When was last frame executed
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let mut last_frame = Instant::now();
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loop {
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// Sleep to avoid blocking the thread for too long
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if let Some(sleep) = per_frame.checked_sub(last_frame.elapsed()) {
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tokio::time::sleep(sleep).await;
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}
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// Get crossterm event and send a new one over the channel
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if event::poll(Duration::from_secs(0)).expect("no events available") {
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match event::read().expect("unable to read event") {
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event::Event::Key(e) => event_sender.send(Event::Key(e)).await.unwrap_or(()),
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event::Event::Resize(w, h) => {
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event_sender.send(Event::Resize(w, h)).await.unwrap_or(())
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}
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_ => (),
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}
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}
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// Frame budget exceeded
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if last_frame.elapsed() >= per_frame {
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// Send tick
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event_sender.send(Event::Tick).await.unwrap_or(());
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// Rest last_frame time
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last_frame = Instant::now();
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}
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}
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}
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