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keyboard-state.rs
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keyboard-state.rs
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extern crate sdl2;
use sdl2::event::Event;
use sdl2::keyboard::Keycode;
use std::collections::HashSet;
use std::time::Duration;
pub fn main() -> Result<(), String> {
let sdl_context = sdl2::init()?;
let video_subsystem = sdl_context.video()?;
let _window = video_subsystem
.window("Keyboard", 800, 600)
.position_centered()
.build()
.map_err(|e| e.to_string())?;
let mut events = sdl_context.event_pump()?;
let mut prev_keys = HashSet::new();
'running: loop {
for event in events.poll_iter() {
if let Event::Quit { .. } = event {
break 'running;
};
}
// Create a set of pressed Keys.
let keys = events
.keyboard_state()
.pressed_scancodes()
.filter_map(Keycode::from_scancode)
.collect();
// Get the difference between the new and old sets.
let new_keys = &keys - &prev_keys;
let old_keys = &prev_keys - &keys;
if !new_keys.is_empty() || !old_keys.is_empty() {
println!("new_keys: {:?}\told_keys:{:?}", new_keys, old_keys);
}
prev_keys = keys;
std::thread::sleep(Duration::from_millis(100));
}
Ok(())
}