hey we have a `LazyVerticalGrid` with pagination d...

[agrosner]

hey we have a LazyVerticalGrid with pagination detection (code in 🧵 ).
when using this extension on the lazy grid state, the composable begins to misbehave and continously rerender (non-stop, in the thousands over time). It seems that invalidations always go through the lazygrid measure result class. why would measurement change here, given we’re deriving state and remembering the value.

[agrosner]

@Composable
private fun LazyGridState.onBottomReached(
    // tells how many items before we reach the bottom of the list
    // to call onLoadMore function
    buffer: Int = 0,
    loadMore: () -> Unit
) = apply {
    // state object which tells us if we should load more
    val shouldLoadMoreBuffer = remember(layoutInfo.totalItemsCount) {
        derivedStateOf {
            // get last visible item
            val lastVisibleItem = layoutInfo.visibleItemsInfo.lastOrNull() ?: return@derivedStateOf false

            // Check if last visible item is the last item in the list
            val bufferIndex = layoutInfo.totalItemsCount - 1 - buffer
            lastVisibleItem.index >= bufferIndex
        }
    }

    LaunchedEffect(shouldLoadMoreBuffer) {
        snapshotFlow { shouldLoadMoreBuffer.value }
            .filter { it }
            .collect { loadMore() }
    }
}

[agrosner]

fun video

Screen Recording 2023-03-16 at 1.03.04 PM.mov

[agrosner]

moved it into a snapshotflow seems to have fixed it.