override fun onDrawOver(canvas: Canvas,
                            recyclerView: RecyclerView,
                            state: RecyclerView.State) {

        super.onDrawOver(canvas, recyclerView, state)

        when (showLoading(recyclerView)) {
            true -> {
                PaginationProgressDrawer.drawSpinner(recyclerView, canvas)
                isProgressVisible = true
            }
            else -> {
                if (isProgressVisible) {
                    isProgressVisible = false
                    recyclerView.invalidateItemDecorations()
                }
            }
        }
    }

    private fun showLoading(recyclerView: RecyclerView): Boolean {

        val manager = recyclerView.layoutManager as LinearLayoutManager
        val lastVisibleItemPos = manager.findLastCompletelyVisibleItemPosition()

        return lastVisibleItemPos != -1 &&
               lastVisibleItemPos >= recyclerView.adapter!!.itemCount - 1
    }