import 'dart:async';

​

import 'package:google_maps_flutter/google_maps_flutter.dart';

​

class Locator {

  late GoogleMapController mapController;

  LatLng specifiedLocation = LatLng(37.7749, -122.4194); // San Francisco coordinates

  Map<MarkerId, Marker> markers = <MarkerId, Marker>{};

  final StreamController<Set<Marker>> _streamController = StreamController<Set<Marker>>();

  Stream<Set<Marker>> get markerStream => _streamController.stream;

​

  void _setupMap() {

    mapController.animateCamera(

      CameraUpdate.newCameraPosition(

        CameraPosition(target: specifiedLocation, zoom: 15),

      ),

    );

    markerCreate();

    _streamController.add(markers.values.toSet());

  }

​

  void markerCreate() {

    final marker = Marker(

      markerId: MarkerId('specifiedLocation'),

      position: specifiedLocation,

      icon: BitmapDescriptor.defaultMarker,

      infoWindow: InfoWindow(title: 'Specified location', snippet: '$specifiedLocation'),

    );

    markers[MarkerId('specifiedLocation')] = marker;

  }

​

  Future<void> onMapCreated(GoogleMapController controller) async {

    mapController = controller;

    _setupMap();

  }

}