What's the pattern to pass state up the component tree? Use case: I have some deep child scrollable ...

# compose

[dimsuz]

What's the pattern to pass state up the component tree? Use case: I have some deep child scrollable component, and I want to display a scroll position in the parent. I guess I should pass the mutable state down to this component and observe it in the parent, correct?

[Halil Ozercan]

yes, that's one right way to do it. If I'm not mistaken ScrollableColumn does exactly what you described.

[dimsuz]

great, thanks!

[Davide Giuseppe Farella]

You also can pass a lambda that updates it

MyChild(onScroll = { scrollPosition.value = it })

fun MyChild(onScroll: (Int) -> Unit)

[dimsuz]

oh, right, that's even simpler.