GTK4 - Rust: Failed to create signal

[Donatas_Azaravicius (Donatas Azaravičius)]

Hello,
I am making application using rust language with gtk4. Here is image of my application (at the top is my app window and below is GtkInspector window).

GtkApplicationWindow → GeoWindow → GeoReserves → GeoReservesList → GtkScrolledWindow → GtkListView -->GeoRow

GeoRow is custom GtkButton. I have connected to GeoRow clicked signal in GeoReservesList, but I need to move this signal to GeoWindow.

Every GeoRow holds i32 number and after it is clicked I need to move this number to GeoWindow. After GeoWindow gets number it will replace GeoReserves with new widget with data related to number.

I have tried to create new signal in GeoReservesList and emit it up to GeoReserves, but I have problem with rust lifetime of self. Some code from GeoReservesList in gtk::SignalListItemFactory

factory.connect_bind(move |_factory, item| {
            let item = item.downcast_ref::<gtk::ListItem>().unwrap();
            let reserve = item.item().and_downcast::<Reserve>().unwrap();
    
            let child = item.child().and_downcast::<Row>().unwrap();
            child.set_reserve(&reserve);

            let obj = self.obj();

            child.connect_clicked(move |btn| {
                obj.emit_by_name::<()>("reserve-pressed", &[&btn.id()]);
            });
});

If I replaced obj.emit… with println!(“id: {}”, btn.id()); it would work and print GeoRow id to console, but obj.emit… don’t want to work because of lifetime.

Is here a better way to connect GeoRow clicked signal to GeoWindow to replace GeoReserves widget?

[Donatas_Azaravicius (Donatas Azaravičius)]

I was able to find how to send signal up. I have changed code above to this

let obj = self.obj().clone();
    
factory.connect_bind(move |_factory, item| {
            let item = item.downcast_ref::<gtk::ListItem>().unwrap();
            let reserve = item.item().and_downcast::<Reserve>().unwrap();
    
            let child = item.child().and_downcast::<Row>().unwrap();
            child.set_reserve(&reserve);

            child.connect_clicked(clone!(@weak obj => move |btn| 
                obj.emit_by_name::<()>("reserve-pressed", &[&btn.id()]);
            ));
});

With this I was able to move self to closure. Coughed signal in GeoReserves with

let obj = obj.clone();

 use glib::closure_local;
 reserve_list.connect_closure("reserve-pressed", false, closure_local!( move |_obj: glib::Object, id: i32| {
            obj.emit_by_name::<()>("reserve-pressed", &[&id]);
 }),);

and sent it up to GeoWindow