public void Back(int stepsCount)
{
if (stepsCount < 1 || stepsCount > _backPath.Count)
throw new ArgumentOutOfRangeException("stepsCount");
_forwardPath.Insert(0, _current);
if (stepsCount > 1)
_forwardPath.InsertRange(0, _backPath.GetRange(0, stepsCount - 1));
_current = _backPath[stepsCount - 1];
_backPath.RemoveRange(0, stepsCount);
_current.Navigate();
_changed.OnNext(EventArgs.Empty);
}
public void Forward(int stepsCount)
{
if (stepsCount < 1 || stepsCount > _forwardPath.Count)
{
throw new ArgumentOutOfRangeException("stepsCount");
}
_backPath.Insert(0, _current);
if (stepsCount > 1)
{
_backPath.InsertRange(0, _forwardPath.GetRange(0, stepsCount - 1));
}
_current = _forwardPath[stepsCount - 1];
_forwardPath.RemoveRange(0, stepsCount);
_current.Navigate();
_changed.OnNext(EventArgs.Empty);
}