ItemOffsetDecorator for RecyclerView

ItemOffsetsDecorator.kt

class ItemOffsetsDecorator(
        private val block: (position: Int, count: Int, rect: Rect) -> Unit
): RecyclerView.ItemDecoration() {

    override fun getItemOffsets(outRect: Rect?, view: View?, parent: RecyclerView?, state: RecyclerView.State?) {
        super.getItemOffsets(outRect, view, parent, state)
        parent?.getChildAdapterPosition(view)?.run position@ {
            outRect?.run rect@ {
                state?.itemCount?.run count@ {
                    block.invoke(this@position, this@count, this@rect)
                }
            }
        }
    }
}