[Question] usage of MapOptions and the onPositionChanged about flutter_map HOT 2 CLOSED

class _PropertiesMap extends StatelessWidget {
  final double width;
  final double mapZoom;
  final LatLng mapCenter;
  final Function(LatLng, double) onViewChanged;
  final Function(PropertyListItem) onPropertySelected;
  // The starting center position of the map
  final Latlng _firstMapCenter;
  // Whether or not the map has moved via `onPositionChanged`
  final bool _mapHasMoved = false;

  _PropertiesMap(
      {@required this.width,
      @required this.mapCenter,
      @required this.mapZoom,
      @required this.onViewChanged}) : _firstMapCenter = mapCenter;

  @override
  Widget build(BuildContext context) {
    print('mapCenterOnBuild:${this.mapCenter}'); //FIRST PRINT
    final mapOptions = MapOptions(
        zoom: this.mapZoom,
        onPositionChanged: (position) {
          // Ignore if this is the first event
       	  if (!_mapHasMoved && position == _firstMapCenter) {
       	    return;
       	  }
          if (position.center != null && position.zoom != null) {
            onViewChanged(position.center, position.zoom);
            _mapHasMoved = true;
          }
          print('mapCenterOnEvent:${this.mapCenter}');//SECOND PRINT
        },
        center: this.mapCenter);
    return Stack(fit: StackFit.expand, children: <Widget>[
      FlutterMap(
        options: mapOptions,
        layers: [
          TileLayerOptions(
              urlTemplate:
                  "https://api.tiles.mapbox.com/v4/{id}/{z}/{x}/{y}@2x.png?access_token={accessToken}",
              additionalOptions: {
                'accessToken':'<Token>',
                'id': 'mapbox.streets'
              }),
        ],
      ),
    ]);
  }