CODEWITHSUNDEEP
rustwasm-bindgenrust-wasmwasm-packweb-sys
Kshitiz Kumar
Kshitiz Kumar

Reputation: 26

problem in window().set_timeout_with_callback_and_timeout_and_arguments_0 , how to setTimeout in rust-wasm correctly?

I am building a snake game in web assembly, after lot of code commenting and un-commenting, i am seeing where it is giving me error, its giving me error in window().set_timeout_with_callback_and_timeout_and_arguments_0 saying

Uncaught Error: expected a number argument, found undefined
    at _assertNum (index_bg.js:246:1)
    at __wbg_adapter_27 (index_bg.js:257:1)
    at real (index_bg.js:214:1)

code snippet of the game loop:

fn game_loop(snake: Rc<RefCell<Snake>>, canvas: Rc<Canvas>, time: u32){
        let cl = Closure::<dyn FnMut(_)>::new(move |_: i32|{
            game_loop(snake.clone(), canvas.clone(), time);
            snake.borrow_mut().update();
            snake.borrow().draw(&canvas);
        });
        
        let _ = utils::window().set_timeout_with_callback_and_timeout_and_arguments_0(cl.as_ref().unchecked_ref(), 100);
    }

    game_loop(snake, Rc::new(canvas), 100);

github link: https://github.com/kshitijk83/snake-game

what i found: __wbg_adapter_27 is written like this->

function __wbg_adapter_27(arg0, arg1, arg2) {
    _assertNum(arg0);
    _assertNum(arg1);
    _assertNum(arg2);
    wasm._dyn_core__ops__function__FnMut__A____Output___R_as_wasm_bindgen__closure__WasmClosure___describe__invoke__hcf9afe44e302a4ef(arg0, arg1, arg2);
}

arg2 is undefined here it is expecting a num here.

I have tried set_timeout_with_callback_and_timeout_and_arguments_1 function passing it another argument it doesn't work. i have gone through the doc and set_timeout_with_callback_and_timeout_and_arguments_0 definition looks same to me.

Upvotes: 0

Views: 70

Answers (1)

Kshitiz Kumar
Kshitiz Kumar

Reputation: 26

I went throught web-sys docs and i found that I forgot to call closure.forget(), and I was using bad _ in dyn Fn(_) which was giving time this error. corrected code:

 fn game_loop(snake: Rc<RefCell<Snake>>, canvas: Rc<Canvas>, time: u32){
        let snake_clone = snake.clone();
        let canvas_clone = canvas.clone();
        let cl = Closure::<dyn Fn()>::new(move ||{
            snake_clone.borrow_mut().update();
            snake_clone.borrow().draw(&canvas_clone);
            game_loop(snake_clone.clone(), canvas_clone.clone(), time);
        });
        
        let _ = utils::window().set_timeout_with_callback_and_timeout_and_arguments_0(cl.as_ref().clone().as_ref().unchecked_ref(), 100);

        cl.forget();
    }

Upvotes: 0

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