Controller position stream

example/lib/pages/map_controller.dart

@@ -1,6 +1,7 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_map/flutter_map.dart';
 import 'package:latlong/latlong.dart';
+import 'package:location/location.dart';
 
 import '../widgets/drawer.dart';
 
@@ -92,6 +93,7 @@ class MapControllerPageState extends State<MapControllerPage> {
  mapController.move(dublin, 5.0);
  },
  ),
+ CurrentLocation(mapController: mapController),
  ],
  ),
  ),
@@ -171,3 +173,49 @@ class MapControllerPageState extends State<MapControllerPage> {
  );
  }
 }
+
+class CurrentLocation extends StatefulWidget {
+ const CurrentLocation({
+ Key key,
+ @required this.mapController,
+ }) : super(key: key);
+
+ final MapController mapController;
+
+ @override
+ _CurrentLocationState createState() => _CurrentLocationState();
+}
+
+class _CurrentLocationState extends State<CurrentLocation> {
+ var icon = Icons.gps_not_fixed;
+
+ void _moveToCurrent() async {
+ var location = Location();
+
+ try {
+ var currentLocation = await location.getLocation();
+ widget.mapController.move(
+ LatLng(currentLocation.latitude, currentLocation.longitude), 18);
+
+ setState(() {
+ icon = Icons.gps_fixed;
+ });
+ await widget.mapController.position.first;
+ setState(() {
+ icon = Icons.gps_not_fixed;
+ });
+ } catch (e) {
+ setState(() {
+ icon = Icons.gps_off;
+ });
+ }
+ }
+
+ @override
+ Widget build(BuildContext context) {
+ return IconButton(
+ icon: Icon(icon),
+ onPressed: _moveToCurrent,
+ );
+ }
+}

lib/flutter_map.dart

@@ -91,6 +91,8 @@ abstract class MapController {
 
  ValueChanged<double> onRotationChanged;
 
+ Stream<MapPosition> get position;
+
  factory MapController() => MapControllerImpl();
 }
 

lib/src/map/map.dart

@@ -57,11 +57,15 @@ class MapControllerImpl implements MapController {
 
  @override
  ValueChanged<double> onRotationChanged;
+
+ @override
+ Stream<MapPosition> get position => _state._positionSink.stream;
 }
 
 class MapState {
  MapOptions options;
  final StreamController<Null> _onMoveSink;
+ final StreamController<MapPosition> _positionSink;
 
  double _zoom;
  double rotation;
@@ -77,7 +81,8 @@ class MapState {
  MapState(this.options)
  : rotation = options.rotation,
  _zoom = options.zoom,
- _onMoveSink = StreamController.broadcast();
+ _onMoveSink = StreamController.broadcast(),
+ _positionSink = StreamController.broadcast();
 
  CustomPoint _size;
 
@@ -131,21 +136,19 @@ class MapState {
  center = options.containPoint(center, _lastCenter ?? center);
  }
 
+ var mapPosition = MapPosition(
+ center: center, bounds: bounds, zoom: zoom, hasGesture: hasGesture);
+
  _zoom = zoom;
  _lastCenter = center;
  _lastPixelBounds = getPixelBounds(_zoom);
  _lastBounds = _calculateBounds();
  _pixelOrigin = getNewPixelOrigin(center);
  _onMoveSink.add(null);
+ _positionSink.add(mapPosition);
 
  if (options.onPositionChanged != null) {
- options.onPositionChanged(
- MapPosition(
- center: center,
- bounds: bounds,
- zoom: zoom,
- ),
- hasGesture);
+ options.onPositionChanged(mapPosition, hasGesture);
  }
  }