Does ```collectAsLazyPagingItems()``` respect something like ```flow.flowWithLifecycle(lifecycleOwne...

# compose

[FunkyMuse]

Does

collectAsLazyPagingItems()

respect something like

flow.flowWithLifecycle(lifecycleOwner.lifecycle, Lifecycle.State.STARTED)

or the data is updated even when the UI isn't in started mode?

[Alexandre Elias [G]]

yes, I believe that should be respected

[Alexandre Elias [G]]

for future reference, the usual recommended way to pause work in Compose between stop and start is to put the workload inside withFrameNanos in an Effect, but you can't do that here since the Effect lives in private code you can't modify. so using flowWithLifecycle seems right

[FunkyMuse]

Thanks Alexandre, my question was since the Provided function doesn't respect that, are we gonna get something in the future that does this or we have to build it for ourselves?

[Alexandre Elias [G]]

my understanding of how it works right now is: pagingDataFlow.collectAsLazyPagingItems() waits for create lifecycle event, but is unaffected by stop and start events. whereas pagingDataFlow.flowWithLifecycle(lifecycleOwner.lifecycle, Lifecycle.State.STARTED).collectAsLazyPagingItems() is additionally paused between stop and start events.

[Alexandre Elias [G]]

I can imagine different developers preferring one or the other and the current way has flexibility to choose, so I'm not sure yet whether Compose-side API will provide anything additional in the future. it's an interesting question we might discuss further though, especially if we hear the question repeatedly

[Alexandre Elias [G]]

please file a bug if you have observed that in fact, ``pagingDataFlow.flowWithLifecycle(lifecycleOwner.lifecycle, Lifecycle.State.STARTED).collectAsLazyPagingItems()`` does not work as desired for some reason. then we are more likely to make a change in Compose

[FunkyMuse]

Thanks Alexandre will try that tomorrow and file a bug if it doesn't work, i was just curious how this were for the future and whether i need to build this myself

[FunkyMuse]

pagingData.flowWithLifecycle(LocalLifecycleOwner.current.lifecycle).collectAsLazyPagingItems()

it doesn't seem to display the data 😕

[Alexandre Elias [G]]

OK, I filed https://issuetracker.google.com/issues/192316456 about this

[Adam Powell]

If that call recomposes it'll start anew since flowWithLifecycle will return a new flow instance, I think what you may want is this:

val lifecycle = LocalLifecycleOwner.current.lifecycle
val lazyPagingItems = remember(pagingData, lifecycle) {
  pagingData.flowWithLifecycle(lifecycle)
}.collectAsLazyPagingItems()

[Adam Powell]

the remember will make sure it doesn't reassemble a new flow chain on recomposition unless you truly have a different pagingData source or lifecycle for that recomposition