Does anybody know whether LazyColumn can be used i...

# compose

[alp]

Does anybody know whether LazyColumn can be used inside androidx.swiperefreshlayout.widget.SwipeRefreshLayout?

There are examples here with a fix using Modifier.nestedScroll(rememberNestedScrollInteropConnection()) for bottom sheet but it seems like it doesn’t work with hierarchy like:

<SwipeRefreshLayout>
   <ComposeView> // LazyColumn with Modifier.nestedScroll(rememberNestedScrollInteropConnection()) here
</SwipeRefreshLayout>

scrolling up immediately triggers the swipe refresh.

[ephemient]

https://android-developers.googleblog.com/2022/05/whats-new-in-jetpack-compose.html#:~:text=rememberNestedScrollInteropConnection (SwipeRefreshLayout is a NestedScrollingParent3 like CoordinatorLayout)

[ephemient]

val state = rememberLazyListState()
LaunchedEffect(listState) {
    swipeRefreshLayout.setOnChildScrollUpCallback { _, _ -> listState.firstVisibleItemScrollOffset > 0 }
}
LazyColumn(state = state, ...)

[alp]

First of all, thanks for the code snippet - that works for the sample but do you know why it doesn’t work out of the box similar to other NestedScrollingParent3 ViewGroups CoordinatorLayout for example?

In more real-world complex scenario, such as when compose code is encapsulated within a fragment, there is not way to propagate SwipeRefreshLayout reference to the compose code, as far as I understand, NestedScrollingParent3 abstraction should solve this issue

[ephemient]

there's multiple different things happening here

[ephemient]

SwipeRefreshLayout is a NestedScrollingParent3, but ComposeView is not a NestedScrollingChild3

[alp]

I thought that NestedScrollInteropConnection makes it a NestedScrollingChild3

[ephemient]

ah, yeah. I tracked it down to the wrong place

[ephemient]

ComposeView is returning false from canScrollVertically before a gesture starts, it seems

[ephemient]

so SwipeRefreshLayout doesn't delegate a pull down into ComposeView, but if you pull even a little bit first then it all works

[alp]

I haven’t debugged it much, just saw that once I scrolled to the bottom, interop connection doesn’t receive events

[alp]

as if SwipeToRefresh consume it

[ephemient]

TBH I'm not entirely sure why it doesn't work on the Compose side…

[alp]

me too, but thanks for looking into it