LazyListState-Example.kt

@Composable
fun Screen() {
    val lazyListState = rememberLazyListState()

    Column {
        AppBar(stringResource(id = R.string.app_name), elevation = lazyListState.elevation)

        LazyColumn(state = lazyListState) {
            ...
        }
    }
}

val LazyListState.elevation: Dp
    get() = if (firstVisibleItemIndex == 0) {
        minOf(firstVisibleItemScrollOffset.toFloat().dp, AppBarDefaults.TopAppBarElevation)
    } else {
        AppBarDefaults.TopAppBarElevation
    }