How to create tree view in Slint

[rdrpenguin04]

Hello! I'm developing an application that needs a tree view, and I was wondering how I'd go about that on Slint. I could reasonably make Slint just take an array and recurse through it to draw each element... but I don't know how to recursively iterate through lists. I could also generate a list that's already been recursed through, but that seems suboptimal and not idiomatic.

What would be a "correct" way to do this in Slint?

[ogoffart]

related issue: #505

There is some implementation of a tree view already in Cargo UI:

https://github.com/slint-ui/cargo-ui/blob/91bee62fbedad92b3fad4fc04d30c2ebb5d477ad/ui/cargo.slint#L179-L193

The way this work is that this is just a ListView, and the model contains the indentation level and some flag if it is open or not and show a open or close symbol.
Then there is some code in rust that "flatten" a tree into a model that is consumed by the ListView:
https://github.com/slint-ui/cargo-ui/blob/91bee62fbedad92b3fad4fc04d30c2ebb5d477ad/src/cargo.rs#L777

I think something similar could work for the official TreeView.

[rdrpenguin04]

Fascinating, alright! While I was waiting, I decided to go with a very similar solution. It's unfortunate that this can't be done directly in Slint code, but that's alright; it gives more control back to the application I guess.

This is a great toolkit; keep it up!