GoogleMapController constructor

GoogleMapController({ required int mapId, required StreamController<MapEvent<Object?>> streamController, required MapWidgetConfiguration widgetConfiguration, MapObjects mapObjects = const MapObjects(), MapConfiguration mapConfiguration = const MapConfiguration(), })

Initializes the GMap, and the sub-controllers related to it. Wires events.

Implementation

GoogleMapController({
  required int mapId,
  required StreamController<MapEvent<Object?>> streamController,
  required MapWidgetConfiguration widgetConfiguration,
  MapObjects mapObjects = const MapObjects(),
  MapConfiguration mapConfiguration = const MapConfiguration(),
}) : _mapId = mapId,
     _streamController = streamController,
     _initialCameraPosition = widgetConfiguration.initialCameraPosition,
     _markers = mapObjects.markers,
     _polygons = mapObjects.polygons,
     _polylines = mapObjects.polylines,
     _circles = mapObjects.circles,
     _clusterManagers = mapObjects.clusterManagers,
     _heatmaps = mapObjects.heatmaps,
     _groundOverlays = mapObjects.groundOverlays,
     _tileOverlays = mapObjects.tileOverlays,
     _lastMapConfiguration = mapConfiguration {
  _circlesController = CirclesController(stream: _streamController);
  _heatmapsController = HeatmapsController();
  _polygonsController = PolygonsController(stream: _streamController);
  _polylinesController = PolylinesController(stream: _streamController);

  // Check if all markers are of the same type. Mixing marker types is not
  // allowed.
  final Set<Type> markerTypes = _markers
      .map((Marker e) => e.runtimeType)
      .toSet();
  if (markerTypes.isNotEmpty) {
    assert(markerTypes.length == 1, 'All markers must be of the same type.');

    switch (mapConfiguration.markerType) {
      case null:
      case MarkerType.marker:
        assert(
          markerTypes.first == Marker,
          'All markers must be of type Marker because '
          'mapConfiguration.markerType is MarkerType.marker',
        );
      case MarkerType.advancedMarker:
        assert(
          markerTypes.first == AdvancedMarker,
          'All markers must be of type AdvancedMarker because '
          'mapConfiguration.markerType is MarkerType.advanced',
        );
    }
  }

  // Advanced and legacy markers are handled differently so markers controller
  // and cluster manager need be initialized with the correct marker type.
  _clusterManagersController = switch (mapConfiguration.markerType) {
    null || MarkerType.marker => ClusterManagersController<gmaps.Marker>(
      stream: _streamController,
    ),
    MarkerType.advancedMarker =>
      ClusterManagersController<gmaps.AdvancedMarkerElement>(
        stream: _streamController,
      ),
  };
  _markersController = switch (mapConfiguration.markerType) {
    null || MarkerType.marker => LegacyMarkersController(
      stream: stream,
      clusterManagersController:
          _clusterManagersController!
              as ClusterManagersController<gmaps.Marker>,
    ),
    MarkerType.advancedMarker => AdvancedMarkersController(
      stream: stream,
      clusterManagersController:
          _clusterManagersController!
              as ClusterManagersController<gmaps.AdvancedMarkerElement>,
    ),
  };

  _tileOverlaysController = TileOverlaysController();
  _groundOverlaysController = GroundOverlaysController(
    stream: _streamController,
  );
  _updateStylesFromConfiguration(mapConfiguration);

  // Register the view factory that will hold the `_div` that holds the map in the DOM.
  // The `_div` needs to be created outside of the ViewFactory (and cached!) so we can
  // use it to create the [gmaps.Map] in the `init()` method of this class.
  _div = createDivElement()
    ..id = _getViewType(mapId)
    ..style.width = '100%'
    ..style.height = '100%';

  ui_web.platformViewRegistry.registerViewFactory(
    _getViewType(mapId),
    (int viewId) => _div,
  );
}