public void SwapPhoneNumbersAtPos(int x1, int y1, int x2, int y2)
{
PhoneNumber p1 = PhoneNumberGet(x1, y1);
PhoneNumber p2 = PhoneNumberGet(x2, y2);
//sanity check, no point of swapping same cells
if (p1 == p2)
{
return;
}
//sanity check, dragging cell out of draw area
if (p1 == null || p2 == null)
{
return;
}
Grid.SetColumn(p1, x2);
Grid.SetRow(p1, y2);
Grid.SetColumn(p2, x1);
Grid.SetRow(p2, y1);
p1.SetCoordinate(x2, y2);
p2.SetCoordinate(x1, y1);
}