Function simple_window 

pub fn simple_window<Message: 'static>(
    live_settings: impl Fn() -> LiveSettings + Send + Sync + 'static,
    settings: impl Fn() -> Settings + Send + Sync + 'static,
    view: Option<impl Fn() -> Element<'static, Action<Message>> + Send + Sync + 'static>,
) -> (Id, Action)

Available on wayland_platform only.

Used to create a window message from within a widget.