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Description
My current solution is following:
fun rememberReorderableLazyListState(
lazyListState: LazyListState,
scrollThresholdPadding: PaddingValues = PaddingValues(0.dp),
scrollThreshold: Dp = ReorderableLazyCollectionDefaults.ScrollThreshold,
onMove: suspend CoroutineScope.(from: LazyListItemInfo, to: LazyListItemInfo) -> Unit,
onDragStart: suspend (from: Int) -> Unit = {},
onDragEnd: suspend (from: Int, to: Int) -> Unit = { _, _ -> }
) : ReorderableLazyListState {
val fromFirst = rememberSaveable { mutableStateOf<Int?>(null)}
val toLast = rememberSaveable { mutableStateOf<Int?>(null)}
val dragDropState = rememberReorderableLazyListState(
lazyListState = lazyListState,
scrollThresholdPadding = scrollThresholdPadding,
scrollThreshold = scrollThreshold,
//scroller = scroller,
onMove = { from, to ->
if (fromFirst.value == null) {
fromFirst.value = from.index
onDragStart(from.index)
}
toLast.value = to.index
onMove(from, to)
}
)
LaunchedEffect(dragDropState.isAnyItemDragging) {
val from = fromFirst.value
val to = toLast.value
if (!dragDropState.isAnyItemDragging) {
fromFirst.value = null
toLast.value = null
if (from != null && to != null)
onDragEnd(from, to)
}
}
return dragDropState
}
You can see I'd like to react to onDragStart and onDrafgEnd events. First one has side effects, second one undos those side effects and persists changes to the database. Those things seem like a very common use case to me.
Problems in the solution above only triggers onDragStart as soon as the first move is occuring... I must use a work around through the draggableHandle modifier which his cumbersome... I could solve this easily if dragDropState.draggingItemKey would be accessible to me.
Why I need that
I want to collapse expandable items and/or hide some items when dragging starts
Suggestion
Either expose draggingItemKey so I can immediately react to it or provide callbacks for onDragStart and onDragEnd to your state.