Substring function in Slint?

[karmakarmeghdip]

I am trying to do something like this in Slint files:

I looked into the docs and couldn't find any functionality to achieve something like this. It seems very trivial to have to do this in rust side and set property in Slint. Is there maybe some hidden functionality to do something like this, undocumented functions or something?

[ogoffart]

Indeed, we don't support this feature.
In general, the Slint language is not meant for application logic. This should be performed in the programming language. You can have a global singleton Logic and do something like initial: Logic.first-char(track.title);