Calling rust function from slint

[realroot2185]

In appwindow.slint I have a component from another slint file which again as a component from another slint file.
In the latter when a Timer ends I like to call a function in the rust backend.
How can I do that?

Since the component is not the main I am not sure to how send it to appwindow.slint and use some handler.

Not sure what's the best method here.

[ultimaweapon]

What I did is forward the callback to the root component. I think another solution is using a global singleton.

[realroot2185]

How do connect it in main.rs in that case?
I have import { Logic } from "global.slint" in appwindow.slint and my_timer.slint.

//main.rs
 let app = App::new()?;
    app.global::<Logic>().on_completed(|| {
    [...]

error[E0412]: cannot find type `Logic` in this scope
  --> src/main.rs:17:18
   |
17 |     app.global::<Logic>().on_completed(|| {
   |                  ^^^^^ not found in this scope

If I declare Logic {} in appwindow.slint it does not compile: error: Cannot create an instance of a global component.

[Vadoola]

You need to re-export it from Appwindow.slint.

I'm on mobile at the moment but it should be something like

`import { Logic } from "global.slint"

Export Logic;
`

If I have the syntax slightly wrong there should be some examples elsewhere in the Slint discussion, or look at the Main Window of my app Tomotroid. There should also be something in the Slint docs about re-exporting.

[realroot2185]

export Logic;

error: Parse error: expected a top-level item such as a component, a struct, or a global

Nice a slint timer app.
It's not so easy to see how because it is not so simple as what I have here.
I think that I will look into that thanks.

#6757
Maybe I need to define my_timer.slint in appwindow.slint because the docs and other discussion have all in one file.

[Vadoola]

You shouldn't need to put it all in one module here is the docs that includes re-exporting: https://releases.slint.dev/1.0.1/docs/slint/src/reference/modules

It looks like in my example above I forgot to out braces around Logic.

It should be

`import { Logic } from "global.slint"

Export {Logic}`