Using on_close_requested callback for Window

[mrandal]

How can I define the on_close_requested() callback in Rust? I am trying to define it as a normal callback, however I keep getting the error error[E0599]: no method named 'on_close_requested' found for struct 'App' in the current scope
App inherits window in the slint file

    let app = App::new().unwrap();
    app.on_close_requested(||{
         // code
         slint::CloseRequestResponse::HideWindow
    });

Here is the documentation - https://snapshots.slint.dev/master/docs/rust/slint/struct.window#method.on_close_requested

[Enyium]

You're trying to call on_close_requested() on the Rust struct the Slint compiler generates for you that implements the ComponentHandle trait. But you first have to call that trait's window() function to retrieve the associated host window struct, called Window.

In #6027, I proposed to better name these things. window() and Window, e.g., could be named host_window()/host() and HostWindow. ComponentHandle could be named WindowComponent.