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use std::io;
use std::sync::mpsc;
use std::thread;
use std::time::Duration;
use termion::event::Key;
use termion::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: mpsc::Receiver<Event<Key>>,
input_handle: thread::JoinHandle<()>,
tick_handle: thread::JoinHandle<()>,
}
#[derive(Debug, Clone, Copy)]
pub struct Config {
pub tick_rate: Duration,
}
impl Default for Config {
fn default() -> Config {
Config {
tick_rate: Duration::from_millis(250),
}
}
}
impl Events {
pub fn new() -> Events {
Events::with_config(Config::default())
}
pub fn with_config(config: Config) -> Events {
let (tx, rx) = mpsc::channel();
let input_handle = {
let tx = tx.clone();
thread::spawn(move || {
let stdin = io::stdin();
for evt in stdin.keys() {
if let Ok(key) = evt {
if let Err(err) = tx.send(Event::Input(key)) {
eprintln!("{}", err);
return;
}
}
}
})
};
let tick_handle = {
thread::spawn(move || loop {
if let Err(err) = tx.send(Event::Tick) {
eprintln!("{}", err);
break;
}
thread::sleep(config.tick_rate);
})
};
Events {
rx,
input_handle,
tick_handle,
}
}
pub fn next(&self) -> Result<Event<Key>, mpsc::RecvError> {
self.rx.recv()
}
}
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