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use std::{thread, time::Duration};
use crossbeam_channel::{bounded, TrySendError};
use termion::{event::Event as TermEvent, event::Key, input::TermRead};
pub enum Event<I> {
Input(I),
Tick,
}
/// A small event handler that wrap termion input and tick events. Each event
/// type is handled in its own thread and returned to a common `Receiver`
pub struct Events {
rx: crossbeam_channel::Receiver<Event<TermEvent>>,
}
#[derive(Debug, Clone, Copy)]
pub struct Config {
pub exit_key: Key,
pub tick_rate: Duration,
}
impl Default for Config {
fn default() -> Config {
Config {
exit_key: Key::Char('q'),
tick_rate: Duration::from_millis(250),
}
}
}
impl Events {
pub fn new() -> Events {
Events::with_config(Config::default())
}
pub fn with_config(config: Config) -> Events {
// Keep channel small so scroll events don't stack for ages.
let (tx, rx) = bounded(1);
{
let tx = tx.clone();
thread::spawn(move || {
let tty = termion::get_tty().expect("Could not find tty");
for event in tty.events().flatten() {
if let Err(err) = tx.try_send(Event::Input(event)) {
if let TrySendError::Full(_) = err {
// Silently ignore send fails when buffer is full.
// This will most likely be scroll wheel spam and we can drop some events.
} else {
eprintln!("{}", err);
return;
}
}
}
})
};
thread::spawn(move || loop {
if tx.send(Event::Tick).is_err() {
break;
}
thread::sleep(config.tick_rate);
});
Events { rx }
}
pub fn next(&self) -> Result<Event<TermEvent>, crossbeam_channel::RecvError> {
self.rx.recv()
}
}
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