How convert the correct type between ModelRc and array(vec)

[keith331]

I'm still learning Rust and Slint, I can set a array to slint, but get array from slint. how to covnert ModelRc(dyn Model) to array(vec) effectively. appreciate it!!
Here is my code

`export component AppWindow inherits Window {
in-out property counter: 42;
in-out property<[bool]> checked_array: [true, true, true, false];
callback sig-checked([bool]);

VerticalBox {
        for item[idx] in checked_array: CheckBox {
        text: @tr("Item {}",idx);
        checked: root.checked_array[idx];
        toggled => {
            root.checked_array[idx] = !root.checked_array[idx];
            root.sig-checked(root.checked_array);
        }
    }
}`

`fn main() -> Result<(), slint::PlatformError> {
let ui = AppWindow::new()?;

//  set property
let initial_array = [false, false, true, false];
ui.set_checked_array(initial_array.into());

// get status
ui.on_sig_checked( {
    move |output_states| {
        println!("{:#?}", output_states);
    }
});
ui.run()

}
`

[tronical]

I think that might work is this:

output_states.as_any().downcast_ref::<slint::VecModel<bool>>().unwrap()

[keith331]

Well, it is still ModelRc(dyn Model)

[tronical]

After the downcast_ref() call you have a VecModel reference. Here's a self-contained example:

use slint::Model;

slint::slint! {
    import { CheckBox, VerticalBox } from "std-widgets.slint";
    export component App {
        in-out property<[bool]> checked_array: [true, true, true, false];
        callback sig-checked([bool]);
        VerticalBox {
            for item[idx] in checked_array: CheckBox {
                text: @tr("Item {}",idx);
                checked: root.checked_array[idx];
                toggled => {
                    root.checked_array[idx] = !root.checked_array[idx];
                    root.sig-checked(root.checked_array);
                }
            }
        }
    }
}

fn main() -> Result<(), slint::PlatformError> {
    let app = App::new()?;

    app.on_sig_checked(|model| {
        let vecmodel: &slint::VecModel<bool> = model
            .as_any()
            .downcast_ref()
            .unwrap();
        let states = vecmodel.iter().collect::<Vec<_>>();
        eprintln!("states: {:#?}", states);
    });

    app.run()
}

[keith331]

It works. It's quite complicated for me. but slint is really cool. thank you so much @tronical