Hi! :slightly_smiling_face: I have a usecase where...

# compose

[Anders Kielsholm]

Hi! 🙂 I have a usecase where I would like my LazyColumn to scroll to the top if I add a new item to the start of the list - but only if the list was scrolled to top before. Anyone knows how to do that? Think it's something like using a LaunchedEffect, but can't really wrap my head around it 🙂 I'm using keys so the list is in general keeping the same position when adding items 🙂

[mcpiroman]

val vertScrollState = rememberLazyListState()
LazyColumn(state = vertScrollState) 
vertScrollState.scrollToItem(0)

maybe? Assuming there is at least 1 item.

[Anders Kielsholm]

Yeah, that would scroll the list to the top - but I'm uncertain how to do that when a new item is added to the top. There's examples on how to do it for a button click, but not based on several factors (list being at top before adding new item) 🙂

[Anders Kielsholm]

I've also asked this at stackoverflow now: https://stackoverflow.com/questions/68633379/scroll-to-top-when-adding-new-items

[mcpiroman]

Ah, so it's about trigger. So maybe `remember`the size of your list at last compose and compare with the current one, then if the size is different (or just greater than) previous invoke the scroll?

[mcpiroman]

Though that may miss if you remove and add an item quick enough...

[Anders Kielsholm]

In my own case I actually have a single item at top that's shown/hidden based on a boolean, so I would be able to check that boolean. But yeah, my main concern is also about skipping a state since you can't be sure when recomposition happen and in what order as far as I understand it.