Is there any way to `remember` some data inside a ...

# compose

[julioromano]

Is there any way to remember some data inside a LazyList item so that it would be retained in memory when the item scrolls in and out of the list?

[Konstantin Tskhovrebov]

to make it outside the List?

[Francesc]

remember persists data across recompositions; once your item is no longer in the composition, the remember will be discarded. You'd have to remember this at the list scope. What's your use case?

[shikasd]

rememberSaveable kinda does this, but you probably want to move it outside of lazy list item

[julioromano]

Yeah the rememberSaveable part was quite counterintuitive to me but it's indeed true.
Though I'd also wish to actually preserve instances of object, not just their values.

[julioromano]

I get that moving it outside the list is the best way. But is there some perhaps low level API that allows to do this from within a list item's composable? (e.g. something that allows to save arbitrary stuff to the slot table directly, or similar...)

[julioromano]

(so that I can build a nicer looking API with it)

[shikasd]

well remember does save stuff to slot table directly 🙂

[shikasd]

your problem is that slot table is getting cleared when item is reused, so it is no good
you can use view model or something similar (maybe try to just throw a map into CompositionLocal )

[julioromano]

rememberSaveable kinda does this, but you probably want to move it outside of lazy list item

I've experimented a bit with rememberSaveable in items of a LazyColumn. It behaves as expected initially but if the items include anything that uses a SubcomposeLayout no state will be kept even with rememberSaveable. Is this expected?

[shikasd]

No, not expected, it should work in this case. Please file a bug with a repro