#[tokio::main]
async fn main() {
    let mut rx = witas::EventReceiver::new();
    let mut windows = vec![];
    for i in 0..3 {
        let window = witas::Window::builder()
            .title(format!("window{i}"))
            .position((50 * (i + 1), 50 * (i + 1)))
            .inner_size(witas::LogicalSize::new(640, 480))
            .set_receiver(&rx)
            .parent((i != 0).then(|| &windows[i as usize - 1]))
            .await
            .unwrap();
        windows.push(window);
    }
    loop {
        let (event, window) = rx.recv().await;
        if let witas::Event::Closed = event {
            let i = windows.iter().position(|w| w == &window).unwrap();
            println!("winodw{i} closed");
        }
        if windows.iter().all(|w| w.is_closed()) {
            break;
        }
    }
}