rust_minifb/examples/char_callback.rs

use minifb::{Key, Window, WindowOptions};
use std::cell::RefCell;
use std::rc::Rc;

const WIDTH: usize = 640;
const HEIGHT: usize = 360;

type KeyVec = Rc<RefCell<Vec<u32>>>;

struct Input {
    keys: KeyVec,
}

impl Input {
    fn new(data: &KeyVec) -> Input {
        Input { keys: data.clone() }
    }
}

impl minifb::InputCallback for Input {
    fn add_char(&mut self, uni_char: u32) {
        self.keys.borrow_mut().push(uni_char);
    }
}

fn main() {
    let mut buffer: Vec<u32> = vec![0; WIDTH * HEIGHT];

    let mut window = Window::new(
        "Test - ESC to exit",
        WIDTH,
        HEIGHT,
        WindowOptions::default(),
    )
    .unwrap_or_else(|e| {
        panic!("{:?}", e);
    });

    let keys_data = KeyVec::new(RefCell::new(Vec::new()));

    let input = Box::new(Input::new(&keys_data));

    // Limit to max ~60 fps update rate
    window.limit_update_rate(Some(std::time::Duration::from_micros(16600)));
    window.set_input_callback(input);

    while window.is_open() && !window.is_key_down(Key::Escape) {
        for i in buffer.iter_mut() {
            *i = 0; // write something more funny here!
        }

        // We unwrap here as we want this code to exit if it fails. Real applications may want to handle this in a different way
        window.update_with_buffer(&buffer, WIDTH, HEIGHT).unwrap();

        let mut keys = keys_data.borrow_mut();

        for t in keys.iter() {
            println!("Code point: {},   Character: {:?}", *t, char::from_u32(*t));
        }

        keys.clear();
    }
}