Is it possible to observe scroll offset? This code...

# compose

[Brian G]

Is it possible to observe scroll offset? This code does not seem to work:

val state = rememberScrollState()
LaunchedEffect(state) {
  snapshotFlow { state.value }.collect {
    Log.v(TAG, "$it") // This is never called?
  }
}
Box(Modifier.fillMaxSize().verticalScroll(state)) {
   // ... Lot of box contents
}

[Albert Chang]

I think it's because your box doesn't actually scroll. Try making it scrollable, e.g. Box(Modifier.fillMaxSize().verticalScroll(state).height(1000.dp).

[Brian G]

It does scroll, I just didn't include the content in my sample code.

[Albert Chang]

Well I added the height modifier to your code and it does work.

[Zach Klippenstein (he/him) [MOD]]

yea that code looks right

[Brian G]

Hmmm, why doesn't it work for me :(

[Zach Klippenstein (he/him) [MOD]]

Can you post more of your real code?

[Brian G]

After y'all said it looked right, I looked deeper and noticed I was also using a LazyColumn deeper in the tree. The LazyColumn was doing the scrolling, so this one wasn't called. I fixed it 🙂