62 lines
1.4 KiB
Rust
62 lines
1.4 KiB
Rust
//
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// cargo run --example event-poll-read
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//
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use std::io::{stdout, Write};
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use std::time::Duration;
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use crossterm::{
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cursor::position,
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event::{poll, read, DisableMouseCapture, EnableMouseCapture, Event, KeyCode},
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execute,
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screen::RawScreen,
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Result,
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};
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const HELP: &str = r#"Blocking poll() & non-blocking read()
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- Keyboard, mouse and terminal resize events enabled
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- Prints "." every second if there's no event
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- Hit "c" to print current cursor position
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- Use Esc to quit
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"#;
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fn print_events() -> Result<()> {
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loop {
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// Wait up to 1s for another event
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if poll(Duration::from_millis(1_000))? {
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// It's guaranteed that read() wont block if `poll` returns `Ok(true)`
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let event = read()?;
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println!("Event::{:?}\r", event);
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if event == Event::Key(KeyCode::Char('c').into()) {
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println!("Cursor position: {:?}\r", position());
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}
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if event == Event::Key(KeyCode::Esc.into()) {
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break;
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}
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} else {
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// Timeout expired, no event for 1s
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println!(".\r");
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}
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}
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Ok(())
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}
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fn main() -> Result<()> {
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println!("{}", HELP);
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let _r = RawScreen::into_raw_mode()?;
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let mut stdout = stdout();
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execute!(stdout, EnableMouseCapture)?;
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if let Err(e) = print_events() {
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println!("Error: {:?}\r", e);
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}
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execute!(stdout, DisableMouseCapture)?;
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Ok(())
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}
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