forked from crossterm-rs/crossterm
/
event-read.rs
82 lines (65 loc) · 2 KB
/
event-read.rs
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
//! Demonstrates how to block read events.
//!
//! cargo run --example event-read
use std::io::stdout;
use crossterm::event::poll;
use crossterm::{
cursor::position,
event::{
read, DisableFocusChange, DisableMouseCapture, EnableFocusChange, EnableMouseCapture,
Event, KeyCode,
},
execute,
terminal::{disable_raw_mode, enable_raw_mode},
Result,
};
use std::time::Duration;
const HELP: &str = r#"Blocking read()
- Keyboard, mouse, focus and terminal resize events enabled
- Hit "c" to print current cursor position
- Use Esc to quit
"#;
fn print_events() -> Result<()> {
loop {
// Blocking read
let event = read()?;
println!("Event: {:?}\r", event);
if event == Event::Key(KeyCode::Char('c').into()) {
println!("Cursor position: {:?}\r", position());
}
if let Event::Resize(_, _) = event {
let (original_size, new_size) = flush_resize_events(event);
println!("Resize from: {:?}, to: {:?}", original_size, new_size);
}
if event == Event::Key(KeyCode::Esc.into()) {
break;
}
}
Ok(())
}
// Resize events can occur in batches.
// With a simple loop they can be flushed.
// This function will keep the first and last resize event.
fn flush_resize_events(event: Event) -> ((u16, u16), (u16, u16)) {
if let Event::Resize(x, y) = event {
let mut last_resize = (x, y);
while let Ok(true) = poll(Duration::from_millis(50)) {
if let Ok(Event::Resize(x, y)) = read() {
last_resize = (x, y);
}
}
return ((x, y), last_resize);
}
((0, 0), (0, 0))
}
fn main() -> Result<()> {
println!("{}", HELP);
enable_raw_mode()?;
let mut stdout = stdout();
execute!(stdout, EnableFocusChange, EnableMouseCapture)?;
if let Err(e) = print_events() {
println!("Error: {:?}\r", e);
}
execute!(stdout, DisableFocusChange, DisableMouseCapture)?;
disable_raw_mode()
}