Rust Programming By Example

Playing music

We'll create a new Player structure to wrap the event loop. The player will be usable from the main thread to control the music. Here's the structure itself:

pub struct Player {
    app_state: Arc<Mutex<super::State>>,
    event_loop: EventLoop,
}

And here's the start of its constructor:

impl Player {
    pub(crate) fn new(app_state: Arc<Mutex<super::State>>) -> Self {
        let event_loop = EventLoop::new();

        {
            let app_state = app_state.clone();
            let event_loop = event_loop.clone();
            thread::spawn(move || {
                // …
            });
        }

        Player {
            app_state,
            event_loop,
        }
    }
}

We start by creating a new event loop. Then, we start a new thread. We used a new scope to avoid having to rename the variables that will be sent to the thread because these variables are used ...