mimic google behavior with location icon button

lib/extensions/positionLatLngExtension.dart

@@ -0,0 +1,8 @@
+import 'package:geolocator/geolocator.dart';
+import 'package:latlong2/latlong.dart';
+
+extension LatLngPositionExtension on Position {
+  LatLng latlng() {
+    return LatLng(latitude, longitude);
+  }
+}

lib/state/mapState.dart

@@ -4,13 +4,13 @@ import 'package:geolocator/geolocator.dart';
 import 'package:latlong2/latlong.dart';
 
 class MapState extends ChangeNotifier {
-  bool _isCurrentlyLoading = false;
+  bool _isLocationLive = false;
   LatLng? _currentLocation;
   LatLng? _activeMarker;
   final MapController _mapController = MapController();
   final Geolocator _geolocator = Geolocator();
 
-  bool get isCurrentlyLoading => _isCurrentlyLoading;
+  bool get isLocationLive => _isLocationLive;
   LatLng? get getCurrentLocation => _currentLocation;
   LatLng? get getActiveMarker => _activeMarker;
   MapController get getMapController => _mapController;
@@ -18,16 +18,21 @@ class MapState extends ChangeNotifier {
 
   void setCurrentLocation(LatLng? currentLocation) {
     _currentLocation = currentLocation;
+    if (currentLocation != null) _mapController.move(currentLocation, 16);
     notifyListeners();
   }
 
   void setActiveMarker(LatLng? marker) {
     _activeMarker = marker;
+    if (marker != null) {
+      _isLocationLive = false;
+      _mapController.move(marker, 16);
+    }
     notifyListeners();
   }
 
-  void setLoading(bool loading) {
-    _isCurrentlyLoading = loading;
+  void setLocationLive(bool live) {
+    _isLocationLive = live;
     notifyListeners();
   }
 }

lib/view/home.dart

@@ -1,4 +1,5 @@
 import 'package:app/extensions/obtainProviderExtension.dart';
+import 'package:app/extensions/positionLatLngExtension.dart';
 import 'package:app/state/mapState.dart';
 import 'package:app/state/timeStatusState.dart';
 import 'package:app/util/watchState.dart';
@@ -19,41 +20,70 @@ class HomeView extends StatefulWidget {
 
 class _HomePageState extends State<HomeView> {
   bool locationEnabled = false;
-
-  Future<LatLng?> getLatLng() async {
-    LocationPermission permission = await Geolocator.checkPermission();
-    if (permission == LocationPermission.denied) {
-      permission = await Geolocator.requestPermission();
-      if (permission == LocationPermission.denied || permission == LocationPermission.deniedForever) {
-        return null;
-      }
-    }
-
-    setState(() {
-      locationEnabled = true;
-    });
-
-    Position? position;
-    try {
-      position = await Geolocator.getCurrentPosition();
-    } catch (e) {
-      position = await Geolocator.getLastKnownPosition();
-    }
-
-    if (position != null) {
-      return LatLng(position.latitude, position.longitude);
-    }
-    return null;
-  }
-
+  bool locationLoading = false;
 
   @override
   void initState() {
     super.initState();
 
-    Geolocator.checkPermission().then((permission) => setState(() {
-      locationEnabled = permission != LocationPermission.denied && permission != LocationPermission.deniedForever;
-    }));
+    Geolocator.getServiceStatusStream().listen((status) {
+      setState(() {
+        locationEnabled = status == ServiceStatus.enabled;
+      });
+    });
+
+    requestLiveLocation(context.obtainState<MapState>(), false, true, true);
+  }
+
+  Future<void> requestLiveLocation(MapState mapState, bool ask, bool orLast, bool loadingIndicator) async {
+    Position? position;
+    LocationPermission permission = await Geolocator.checkPermission();
+
+    if (loadingIndicator && permission != LocationPermission.deniedForever) {
+      setState(() {
+        locationLoading = true;
+      });
+    }
+
+    if (permission == LocationPermission.denied || permission == LocationPermission.deniedForever) {
+      if (ask && permission != LocationPermission.deniedForever) {
+        permission = await Geolocator.requestPermission();
+      }
+      if (permission == LocationPermission.denied || permission == LocationPermission.deniedForever) {
+        if (orLast) position = await Geolocator.getLastKnownPosition();
+      }
+    }
+
+    if (permission == LocationPermission.denied || permission == LocationPermission.deniedForever) {
+      if (position != null) {
+        setState(() => locationEnabled = true);
+        mapState.setCurrentLocation(position.latlng());
+      }
+      setState(() => locationLoading = false);
+      return;
+    }
+
+    try {
+      position = await Geolocator.getCurrentPosition();
+      setState(() {
+        locationEnabled = true;
+      });
+      mapState.setLocationLive(true);
+      mapState.setCurrentLocation(position.latlng());
+      Geolocator.getServiceStatusStream().first.then((_) => setState(() {
+        mapState.setLocationLive(false);
+      }));
+    } catch (_) {
+      if (orLast) {
+        position = await Geolocator.getLastKnownPosition();
+        if (position != null) {
+          setState(() => locationEnabled = true);
+          mapState.setCurrentLocation(position.latlng());
+        }
+      }
+    }
+
+    setState(() => locationLoading = false);
   }
 
   @override
@@ -72,9 +102,6 @@ class _HomePageState extends State<HomeView> {
                 delegate: LocationSearchDelegate(),
               );
               mapState.setActiveMarker(latLng);
-              if (latLng != null) {
-                mapState.getMapController.move(latLng, 16);
-              }
             },
           ),
           IconButton(
@@ -90,26 +117,15 @@ class _HomePageState extends State<HomeView> {
       ),
       floatingActionButton: FloatingActionButton(
         child: WatchState<MapState>((context, state) {
-          if(locationEnabled)  {
-            if(state.isCurrentlyLoading) {
-              return const Padding(padding: EdgeInsets.all(15), child: CircularProgressIndicator(strokeWidth: 3));
-            } else {
-              return const Icon(Icons.my_location);
-            }
+          if (locationLoading) {
+            return const Padding(padding: EdgeInsets.all(15), child: CircularProgressIndicator(strokeWidth: 3));
+          }
+          if (locationEnabled) {
+            return Icon(state.isLocationLive ? Icons.my_location : Icons.location_searching);
           }
-
           return const Icon(Icons.location_disabled);
         }),
-        onPressed: () async {
-          MapState mapState = context.obtainState<MapState>();
-          mapState.setLoading(true);
-          LatLng? latLng = await getLatLng();
-          if (latLng != null) {
-            mapState.setCurrentLocation(latLng);
-            mapState.getMapController.move(latLng, 16);
-          }
-          mapState.setLoading(false);
-        },
+        onPressed: () => requestLiveLocation(context.obtainState<MapState>(), true, false, true),
       ),
       body: Column(
         children: [

lib/view/map.dart

@@ -1,7 +1,6 @@
 import 'package:app/extensions/obtainProviderExtension.dart';
 import 'package:app/state/mapState.dart';
 import 'package:app/util/watchState.dart';
-import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_map/flutter_map.dart';
 import 'package:http/http.dart';
@@ -20,10 +19,13 @@ class _MapViewState extends State<MapView> {
   Widget build(BuildContext context) {
     return FlutterMap(
       mapController: context.obtainState<MapState>().getMapController,
-      options: const MapOptions(
-        initialCenter: LatLng(50.354, 7.5845),
+      options: MapOptions(
+        onPositionChanged: (position, hasGesture) => {
+          if (hasGesture) context.obtainState<MapState>().setLocationLive(false)
+        },
+        initialCenter: const LatLng(50.354, 7.5845),
         initialZoom: 16,
-        interactionOptions: InteractionOptions(
+        interactionOptions: const InteractionOptions(
           flags: InteractiveFlag.all & ~InteractiveFlag.rotate
         )
       ),