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|
//! Demonstrates how to read events asynchronously with async-std.
//!
//! cargo run --features="event-stream" --example event-stream-async-std
use std::{
io::{stdout, Write},
time::Duration,
};
use futures::{future::FutureExt, select, StreamExt};
use smol::Timer;
// use futures_timer::Delay;
use crossterm::{
cursor::position,
event::{DisableMouseCapture, EnableMouseCapture, Event, EventStream, KeyCode},
execute,
terminal::{disable_raw_mode, enable_raw_mode},
Result,
};
const HELP: &str = r#"EventStream based on futures::Stream with async-std
- Keyboard, mouse and terminal resize events enabled
- Prints "." every second if there's no event
- Hit "c" to print current cursor position
- Use Esc to quit
"#;
async fn print_events() {
let mut reader = EventStream::new();
loop {
let mut delay = Timer::after(Duration::from_millis(1_000)).fuse();
let mut event = reader.next().fuse();
select! {
_ = delay => { println!(".\r"); },
maybe_event = event => {
match maybe_event {
Some(Ok(event)) => {
println!("Event::{:?}\r", event);
if event == Event::Key(KeyCode::Char('c').into()) {
println!("Cursor position: {:?}\r", position());
}
if event == Event::Key(KeyCode::Esc.into()) {
break;
}
}
Some(Err(e)) => println!("Error: {:?}\r", e),
None => break,
}
}
};
}
}
fn main() -> Result<()> {
println!("{}", HELP);
enable_raw_mode()?;
let mut stdout = stdout();
execute!(stdout, EnableMouseCapture)?;
use std::thread;
// Same number of threads as there are CPU cores.
let num_threads = num_cpus::get().max(1);
// A channel that sends the shutdown signal.
let (s, r) = piper::chan::<()>(0);
let mut threads = Vec::new();
// Create an executor thread pool.
for _ in 0..num_threads {
// Spawn an executor thread that waits for the shutdown signal.
let r = r.clone();
threads.push(thread::spawn(move || smol::run(r.recv())));
}
// No need to `run()`, now we can just block on the main future.
smol::block_on(print_events());
// Send a shutdown signal.
drop(s);
// Wait for threads to finish.
for t in threads {
t.join().unwrap();
}
execute!(stdout, DisableMouseCapture)?;
disable_raw_mode()
}
|
