Best way for a "listener" when you hit the bottom of a list? Does this seem fine? <https://stackove...

# compose

[Colton Idle]

Best way for a "listener" when you hit the bottom of a list?

Does this seem fine? https://stackoverflow.com/questions/68924018/jetpack-compose-scroll-to-bottom-listener-end-of-list

LazyColumn(modifier = Modifier.fillMaxSize()) {
    items(someItemList) { item ->
        MyItem(item = item)
    }
    item {
        LaunchedEffect(true) {
            //Do something when List end has been reached
        }
    }
}

[Alexander Zhirkevich]

snapshotFlow { !lazyListState.canScrollForward } ?

[ste]

This is what I do to request more items when the the sixth-to-last (or down) item is displayed

LaunchedEffect(lazyListState) {
        snapshotFlow { lazyListState.layoutInfo.visibleItemsInfo.lastOrNull()?.index }
            .filterNotNull()
            .map { it >= lazyListState.layoutInfo.totalItemsCount - 6 }
            .distinctUntilChanged()
            .filter { it && page.hasNext }
            .mapNotNull { page.mergeWithNext() }
            .collect { page = it }
    }

[youssef hachicha]

why do you use snapshotFlow when you can only use the launchedEffect?

[Stylianos Gakis]

Restarting a LaunchedEffect means you're cancelling a whole coroutine and starting a new one (on the next frame after the change has happened).
With snapshotFlow you keep the coroutine running and just react to new states in your flow will receive. Definitely a better alternative.

[youssef hachicha]

but doesn't the LaunchedEffect automatically restart if its key is lazyListState, so when ever this key would change the entire block will be reset including the snapshotFlow

[Stylianos Gakis]

If the instance of the lazyListState changes sure. But that won't change under this normal operation. The instance you get back from rememberLazyListState will stay the same.

[youssef hachicha]

the instance itself wont change i am with you on that. but the lazyListState itself contains different states, for example the scroll state, any change of those states will trigger the launched effect to reset