// From a button tap
onTap: () async {
          print('MapFilerSettings..FINAL...slected.... check _lat = ' + _lat.toString());
          GeoPoint areaGP = new GeoPoint(_lat, _lng);
          Area searchArea = new Area(areaGP, 50.0);
          getEvents(seachArea);...

   /// biild future or StreamBuilder...test ???


  Stream<List<EventData>> getEvents(area) {
    try {
      return getDataInArea(
          area: area,
          locationFieldNameInDB: 'geoPoint',
          mapper: (eventDoc) {
            print('mapFiterSettings.....getGeoPointsByRadius....data: '+eventDoc.data['email'].toString());
//            var event = _eventSerializer.fromMap(eventDoc.data);
//            // if you serializer does not pass types like GeoPoint through
//            // you have to add that fields manually. If using `jaguar_serializer`
//            // add @pass attribute to the GeoPoint field and you can omit this.
//            event.location = eventDoc.data['location'] as GeoPoint;
//            event.id = eventDoc.documentID;
//            return new EventData(event);
          },
          locationAccessor: (eventData) => eventData.event.location,
          distanceMapper: (eventData, distance) {
            eventData.distance = distance;
            return eventData;
          }, collection: null,
//          distanceAccessor: (eventData) => eventDatas.distance, collection: null,
//          clientSitefilters: (event) => event.startTime > DateTime.now(), collection: null  // filer only future events
      );
    } on Exception catch (ex) {
      print(ex);
    }
    return null;
  }