public void AttachToBack(IMovable obj)
{
if (AttachedPrev == null)
{
AttachedPrev = obj;
obj.AttachToFront(this);
}
else
{
AttachedPrev.AttachToBack(obj);
}
}
public IMovable RemoveFromBack(IMovable obj)
{
if (AttachedPrev == null)
{
return(null);
}
if (AttachedPrev.Equals(obj))
{
IMovable prev = AttachedPrev;
AttachedPrev = null;
return(prev);
}
else
{
return(AttachedPrev.RemoveFromBack(obj));
}
}