private void UpdateSelection(int previousX, int previousY, int x, int y)
{
_selectedSlot = _slots[previousX * 4 + previousY];
_selectedSlot.GetComponent <Image>().color = Color.white;
_selectedSlot = _slots[x * 4 + y];
_selectedSlot.GetComponent <Image>().color = Color.red;
_x = x;
_y = y;
}
