An experimental method for providing item diff animations in a LazyColumn. Note that this only handles additions and removals, not moves.
inline fun <T> LazyListScope.animatedItemsIndexed(
state: List<AnimatedItem<T>>,
enterTransition: EnterTransition = expandVertically(),
exitTransition: ExitTransition = shrinkVertically(),
noinline key: ((item: T) -> Any)? = null,
crossinline itemContent: @Composable LazyItemScope.(index: Int, item: T) -> Unit
)
The state parameter should be obtained through the use of the updateAnimatedItemsState method:
fun <T> updateAnimatedItemsState(
newList: List<T>
): State<List<AnimatedItem<T>>>
Implementation is found here.
Example usage:
val animationState by updateAnimatedItemsState(list)
LazyColumn(Modifier.fillMaxSize()) {
animatedItemsIndexed(animationState, key = { it }) { _, item ->
// item content
// ...
}
}
This repo also provides an example activity.