/// <summary>
/// By default, discard notifications that the door
/// finished opening or closing.
/// </summary>
public virtual void Complete(Door door)
{
}
/// <summary>
/// By default, discard notifications that the door
/// began closing after having been open for a while.
/// </summary>
public virtual void Timeout(Door door)
{
}
/// <summary> /// Subclasses must decide what to do when the user /// clicks the physical carousel button. /// </summary> public abstract void Touch(Door door);