src/game_loop.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

use std::cell::RefCell;
use std::rc::Rc;

use wasm_bindgen::prelude::Closure;
use wasm_bindgen::JsCast;

use crate::game::Game;

pub fn run(game: Game, update_period: i32) {
    game.render();

    let f = Rc::new(RefCell::new(None));
    let g = f.clone();

    *g.borrow_mut() = Some(Closure::wrap(Box::new(move |_| {

        game.update();
        game.render();

        set_timeout(f.borrow().as_ref().unwrap(), update_period);

    }) as Box<dyn FnMut(i32)>));

    set_timeout(g.borrow().as_ref().unwrap(), update_period);
}

fn set_timeout(f: &Closure<dyn FnMut(i32)>, timeout: i32) {
    web_sys::window().unwrap()
        .set_timeout_with_callback_and_timeout_and_arguments_0(f.as_ref().unchecked_ref(), timeout)
        .unwrap();
}