use winit::{
    event::{Event, WindowEvent},
    event_loop::{ControlFlow, EventLoop},
    window::WindowBuilder,
};

#[derive(Debug, Clone, Copy)]
enum CustomEvent {
    Timer,
}

fn main() {
    let event_loop = EventLoop::<CustomEvent>::with_user_event();

    let _window = WindowBuilder::new()
        .with_title("A fantastic window!")
        .build(&event_loop)
        .unwrap();

    // `EventLoopProxy` allows you to dispatch custom events to the main Winit event
    // loop from any thread.
    let event_loop_proxy = event_loop.create_proxy();

    std::thread::spawn(move || {
        // Wake up the `event_loop` once every second and dispatch a custom event
        // from a different thread.
        loop {
            std::thread::sleep(std::time::Duration::from_secs(1));
            event_loop_proxy.send_event(CustomEvent::Timer).ok();
        }
    });

    event_loop.run(move |event, _, control_flow| match event {
        Event::UserEvent(event) => println!("user event: {:?}", event),
        Event::WindowEvent {
            event: WindowEvent::CloseRequested,
            ..
        } => *control_flow = ControlFlow::Exit,
        _ => *control_flow = ControlFlow::Wait,
    });
}