Initially, I created a MyTableView, based on the TableView from the std-widgets.

This slint file also declared a struct:

export struct MyRowInfo {
    textcolor: color,
    background: brush,
    columns: [string],
}

In the application, I added the following code

impl MyRowInfo {
    fn default() -> Self {
        Self {
            textcolor: slint::Color::from_argb_u8(0, 0, 0, 0),
            background: slint::Brush::SolidColor(slint::Color::from_argb_u8(0, 0, 0, 0)),
            columns: ModelRc::default(),
        }
    }
}

This worked quite well. I could create empty MyRowInfos by calling default() - and I could also put them it in a VecModel and set this as the content of MyTableView (In fact, it was a bit more elaborated, but for the sake of simplicity, I stripped it down)

So far so good :)

Now, I had the idea to put all of this into a library crate as it is described in https://docs.slint.dev/latest/docs/slint/guide/language/coding/file/#component-libraries
So the my-tableview.slint file (which also contains the export struct MyRowInfo statement) is now in a library crate.

But how can I move the rust code into the library crate?

The my-tableview.slint file is included from my application crate, which also does the slint::include_modules!(); call. So the MyRowInfo struct is generated there and I have to keep the impl MyRowInfo code in the application crate.

I tried a few things like adding my-tableview.slint to build.rs of the library crate and call slint::include_modules!(); in the library crate. But then I am stuck with MyTableView being compiled twice (once from the library crate and once from the application)