Is it possible to export a function with an array argument to Rust code ?

[loloof64]

Hi ! In my toy project, I'm trying to export a simple array of a custom struct

import { Button, VerticalBox } from "std-widgets.slint";

export struct TranslationArgument {
    name: string,
    value: string,
}

export global Fluent {
    pure callback translate(string, [TranslationArgument]) -> string;
}

export component AppWindow inherits Window {
    in-out property<int> counter: 42;
    callback request-increase-value();
    protected pure function tr(str: string, args: [TranslationArgument]) -> string {
        return Fluent.translate(str, args);
    }
    VerticalBox {
        Text {
            text: root.tr("Counter : {$counter}", [{name: "counter", value: root.counter}]);
        }
        Button {
            text: root.tr("Increase value", []);
            clicked => {
                root.request-increase-value();
            }
        }
    }
}

But when trying to use the callback translatein my rust main file, I'm getting an error due to the fact that the second argument is not iterable

slint::include_modules!();

use std::collections::HashMap;

use i18n_embed::{
    fluent::{fluent_language_loader, FluentLanguageLoader},
    DesktopLanguageRequester,
};
use rust_embed::RustEmbed;

#[derive(RustEmbed)]
#[folder = "i18n"] // path to the compiled localization resources
struct Localizations;

fn main() -> Result<(), slint::PlatformError> {
    let language_loader: FluentLanguageLoader = fluent_language_loader!();
    let requested_languages = DesktopLanguageRequester::requested_languages();
    let _tr = i18n_embed::select(&language_loader, &Localizations, &requested_languages)
        .expect("failed to setup translations");

    let ui = AppWindow::new()?;
    ui.global::<Fluent>().on_translate(move |str, args| {
        let mut arguments = HashMap::new();
        for (name, value) in args { // HERE : args is a ModelRc<TranslationArgument>
            arguments[name] = value.clone();
        }
        language_loader.get_args_concrete(&str, arguments).into()
    });

    let ui_handle = ui.as_weak();
    ui.on_request_increase_value(move || {
        let ui = ui_handle.unwrap();
        ui.set_counter(ui.get_counter() + 1);
    });

    ui.run()
}

So we see that args got the type ModelRc<TranslationArgument> though I declared a list in my slint function.

So is it impossible to use arrays, or is it a bug ?

I'm using slint ui 1.3.0

Regards

[Vadoola]

I could be wrong but I believe a for loop typically desugars to using into_iter(). ModelRc I believe has iter() but not into_iter(). So I think you need to change the line to

for (name, value) in args.iter()

[loloof64]

Thank you, the error is gone. Now I got other errors, but that's another issue.