SnapHelper tip: limit the maximum fling distance

snaphelpertip1.kt

private var scroller: Scroller? = null
private val minX = -2000
private val maxX = 2000
private val minY = -2000
private val maxY = 2000

override fun attachToRecyclerView(recyclerView: RecyclerView?) {
    scroller = Scroller(recyclerView?.context, DecelerateInterpolator())
    super.attachToRecyclerView(recyclerView)
}
override fun calculateScrollDistance(velocityX: Int, velocityY: Int): IntArray {
    val out = IntArray(2)
    scroller?.fling(0, 0, velocityX, velocityY, minX, maxX, minY, maxY)
    out[0] = scroller?.finalX ?: 0
    out[1] = scroller?.finalY ?: 0
    return out
}