@Override
  public boolean update(DnDEvent event) {
    boolean isDropPossible = isDropPossible(event);
    event.setDropPossible(isDropPossible);
    if (isDropPossible) {
      myAlarm.request();
    }
    else {
      myAlarm.cancelAllRequests();
    }
    return !isDropPossible;
  }
@Override
  public boolean update(DnDEvent event)