working state with dynamic location tracker

lib/modules/navigation.dart

@@ -1,13 +1,62 @@
 import 'package:flutter/material.dart';
 
-Widget singleDestination(BuildContext context, String title, String description, String image) {
+
+
+List<Widget> loadDestinations() {
+  List<Widget> cities =  [
+    singleDestination(
+      "New York",
+      "The Big Apple",
+      "https://upload.wikimedia.org/wikipedia/commons/thumb/3/34/View_of_New_York_City.jpg/800px-View_of_New_York_City.jpg"
+    ),
+    singleDestination(
+      "Los Angeles",
+      "City of Angels",
+      "https://upload.wikimedia.org/wikipedia/commons/thumb/8/8d/Los_Angeles_City_Hall_2013.jpg/800px-Los_Angeles_City_Hall_2013.jpg"
+    ),
+    singleDestination(
+      "Chicago",
+      "The Windy City",
+      "https://upload.wikimedia.org/wikipedia/commons/thumb/6/6f/Chicago_skyline%2C_viewed_from_John_Hancock_Center.jpg/800px-Chicago_skyline%2C_viewed_from_John_Hancock_Center.jpg"
+    ),
+    singleDestination(
+      "San Francisco",
+      "The Golden City",
+      "https://upload.wikimedia.org/wikipedia/commons/thumb/6/6d/San_Francisco_City_Hall_2013.jpg/800px-San_Francisco_City_Hall_2013.jpg"
+    ),
+    singleDestination(
+      "Miami",
+      "The Magic City",
+      "https://upload.wikimedia.org/wikipedia/commons/thumb/6/6e/Miami_collage.jpg/800px-Miami_collage.jpg"
+    ),
+    singleDestination(
+      "Las Vegas",
+      "Sin City",
+      "https://upload.wikimedia.org/wikipedia/commons/thumb/6/6e/Las_Vegas_Strip.jpg/800px-Las_Vegas_Strip.jpg"
+    ),
+    singleDestination(
+      "Seattle",
+      "Emerald City",
+      "https://upload.wikimedia.org/wikipedia/commons/thumb/2/2f/Seattle_Kerry_Park_Skyline.jpg/800px-Seattle_Kerry_Park_Skyline.jpg"
+    ),
+    singleDestination(
+      "Boston",
+      "Beantown",
+      "https://upload.wikimedia.org/wikipedia/commons/thumb/0/0f/Boston_skyline_from_Longfellow_Bridge_September_2017_panorama_2.jpg/800px-Boston"
+    )
+  ];
+  cities.shuffle();
+  return cities;
+}
+
+Widget singleDestination(String title, String description, String image) {
   return Card(
     child: ListTile(
       leading: Icon(Icons.location_on),
       title: Text(title),
       subtitle: Text(description),
       onTap: () {
-        Navigator.pushNamed(context, '/destination');
+        // Navigator.pushNamed(context, '/destination');
       },
     ),
   );

lib/modules/overview.dart

@@ -1,14 +1,74 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_map/flutter_map.dart';
 import 'package:sliding_up_panel/sliding_up_panel.dart';
+import 'package:latlong2/latlong.dart';
+import 'package:geocoding/geocoding.dart';
+import 'package:geocode/geocode.dart';
+import 'dart:async';
+
 import 'package:fast_network_navigation/modules/navigation.dart';
 
 class MapPage extends StatefulWidget {
   @override
   _MapPageState createState() => _MapPageState();
 }
+class Debounce {
+  Duration delay;
+  Timer? _timer;
+
+  Debounce(
+    this.delay,
+  );
+
+  call(void Function() callback) {
+    _timer?.cancel();
+    _timer = Timer(delay, callback);
+  }
+
+  dispose() {
+    _timer?.cancel();
+  }
+}
+
 
 class _MapPageState extends State<MapPage> {
+  GeoCode geoCode = GeoCode();
+  final mapController = MapController();
+  String _currentCityName = "...";
+  final Debounce _debounce = Debounce(Duration(seconds: 3));
+
+  void _setCurrentCityName() async {
+    if (mapController.camera.zoom < 9) {
+      return; // Don't bother if the view is too wide
+    }
+    var currentCoordinates = mapController.camera.center;
+    String? city;
+    
+    try{
+      List<Placemark> placemarks = await placemarkFromCoordinates(currentCoordinates.latitude, currentCoordinates.longitude);
+      city = placemarks[0].locality.toString();
+    } catch (e) {
+      debugPrint("Error: $e");
+      try {
+        Address address = await geoCode.reverseGeocoding(latitude: currentCoordinates.latitude, longitude: currentCoordinates.longitude);
+        
+        if (address.city == null || address.city.toString().contains("Throttled!")){
+          throw Exception("Probably rate limited");
+        }
+        city = address.city.toString();
+      } catch (e) {
+        debugPrint("Error: $e");
+
+      }
+    }
+    if (city != null) {
+      setState(() {
+        _currentCityName = city!;
+      });
+    } else {
+      _debounce(() async {_setCurrentCityName();});
+    }
+  }
 
   @override
   Widget build(BuildContext context) {
@@ -18,8 +78,15 @@ class _MapPageState extends State<MapPage> {
         panel: _floatingPanel(theme),
         collapsed: _floatingCollapsed(theme),
         body: FlutterMap(
+          mapController: mapController,
           options: MapOptions(
             initialZoom: 11,
+            initialCenter: LatLng(51.509364, -0.128928),
+            onMapReady: () {
+                mapController.mapEventStream.listen((evt) {_debounce(() async {_setCurrentCityName();});});
+                // And any other `MapController` dependent non-movement methods
+            },
+
           ),
           children: [
             openStreetMapTileLayer,
@@ -59,14 +126,7 @@ class _MapPageState extends State<MapPage> {
             children: <Widget>[
               Greeting(theme),
               Text("Got a lot to do today! Here is a rundown:"),
-              singleDestination(context, "Location 1", "some description", "Further information"),
-              singleDestination(context, "Location 2", "some description", "Further information"),
-              singleDestination(context, "Location 3", "some description", "Further information"),
-              singleDestination(context, "Location 4", "some description", "Further information"),
-              singleDestination(context, "Location 5", "some description", "Further information"),
-              singleDestination(context, "Location 6", "some description", "Further information"),
-              singleDestination(context, "Location 7", "some description", "Further information"),
-              singleDestination(context, "Location 8", "some description", "Further information"),
+              ...loadDestinations(),
             ],
           ),
         ),
@@ -78,7 +138,7 @@ class _MapPageState extends State<MapPage> {
   Widget Greeting (ThemeData theme) {
     return Center(
         child: Text(
-          "Explore Kview",
+            "Explore ${_currentCityName}",
           style: TextStyle(color: theme.primaryColor, fontSize: 24.0, fontWeight: FontWeight.bold),
         ),
       );