View.scrollChangesCompact.kt

@RequiresApi(Build.VERSION_CODES.M)
fun View.scrollChanges() = callbackFlow {
    val listener = View.OnScrollChangeListener { v, scrollX, scrollY, oldScrollX, oldScrollY ->
        trySendBlocking(Quintuple(v, scrollX, scrollY, oldScrollX, oldScrollY))
    }
    setOnScrollChangeListener(listener)
    awaitClose { setOnScrollChangeListener(null) }
}

fun ViewTreeObserver.scrollChanges() = callbackFlow {
    val listener = ViewTreeObserver.OnScrollChangedListener { trySendBlocking(Unit) }
    addOnScrollChangedListener(listener)
    awaitClose { removeOnScrollChangedListener(listener) }
}

fun View.scrollChangesCompact() =
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) scrollChanges()
    else viewTreeObserver.scrollChanges().scan(Quintuple(this, scrollX, scrollY, -1, -1)) { old, _ ->
        val (_, oldX, oldY, _, _) = old
        Quintuple(this, scrollX, scrollY, oldX, oldY)
    }