Locations screen and add locations form

lib/components/locations/add_location_form.dart

@@ -0,0 +1,143 @@
+import 'package:flutter/material.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+class AddLocationsForm extends StatefulWidget {
+  final SharedPreferences prefs;
+
+  const AddLocationsForm(this.prefs, {Key? key}) : super(key: key);
+
+  @override
+  AddLocationsFormState createState() => AddLocationsFormState();
+}
+
+class AddLocationsFormState extends State<AddLocationsForm> {
+  final _formKey = GlobalKey<FormState>();
+  final locationFormController = TextEditingController();
+  String? newLocationName;
+  double? newLatitude;
+  double? newLongitude;
+  late List<String> savedLocations;
+
+  @override
+  void initState() {
+    super.initState();
+    savedLocations = widget.prefs.getStringList('savedLocations') ?? [];
+  }
+
+  @override
+  void dispose() {
+    locationFormController.dispose();
+    super.dispose();
+  }
+
+  void _submitLocation() {
+    if (_formKey.currentState!.validate()) {
+      _formKey.currentState!.save();
+      _saveLocationToPrefs(newLocationName!, newLatitude!, newLongitude!);
+      _formKey.currentState!.reset();
+      newLocationName = null;
+      newLatitude = null;
+      newLongitude = null;
+    }
+  }
+
+  void _saveLocationToPrefs(String name, double lat, double lon) {
+    savedLocations.add(name);
+    widget.prefs.setStringList('savedLocations', savedLocations);
+    widget.prefs.setDouble("$name-lat", lat);
+    widget.prefs.setDouble("$name-lon", lon);
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Form(
+        key: _formKey,
+        child: Column(children: [
+          Flexible(
+              flex: 4,
+              child: TextFormField(
+                //Location Name
+                onSaved: (input) {
+                  newLocationName = input;
+                },
+                controller: locationFormController,
+                validator: ((value) {
+                  if (value == null || value.isEmpty) {
+                    return "Please enter a name for the new location";
+                  }
+                  if (savedLocations.contains(value)) {
+                    return "Location name already in use";
+                  }
+                  return null;
+                }),
+                decoration: const InputDecoration(
+                    border: UnderlineInputBorder(), labelText: "Location Name"),
+              )),
+          Row(
+            crossAxisAlignment: CrossAxisAlignment.end,
+            children: [
+              Flexible(
+                  flex: 1,
+                  child: TextFormField(
+                    //Latitude
+                    validator: ((value) {
+                      if (value == null || value.isEmpty) {
+                        return "Please enter a value";
+                      }
+                      try {
+                        double.parse(value);
+                      } catch (e) {
+                        return "Please enter a number";
+                      }
+                      return null;
+                    }),
+                    onSaved: (input) {
+                      newLatitude = double.parse(input!);
+                    },
+                    keyboardType: TextInputType.number,
+                    decoration: const InputDecoration(
+                        border: UnderlineInputBorder(), labelText: "Latitude"),
+                  )),
+              const SizedBox(width: 10),
+              Flexible(
+                  flex: 1,
+                  child: TextFormField(
+                    //Longitude
+                    validator: ((value) {
+                      if (value == null || value.isEmpty) {
+                        return "Please enter a value";
+                      }
+                      try {
+                        double.parse(value);
+                      } catch (e) {
+                        return "Please enter a number";
+                      }
+                      return null;
+                    }),
+                    onSaved: (input) {
+                      newLongitude = double.parse(input!);
+                    },
+                    keyboardType: TextInputType.number,
+                    decoration: const InputDecoration(
+                        border: UnderlineInputBorder(), labelText: "Longitude"),
+                  )),
+              const SizedBox(width: 10),
+              Flexible(
+                  flex: 2,
+                  child: ElevatedButton(
+                      onPressed: () {
+                        _submitLocation();
+                      },
+                      child: Row(
+                        mainAxisAlignment: MainAxisAlignment.spaceEvenly,
+                        children: const [
+                          Icon(Icons.add),
+                          SizedBox(width: 5),
+                          Text("Add Location")
+                        ],
+                      )))
+            ],
+          )
+        ]));
+  }
+}

lib/components/main_menu.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:wetter/screens/locations.dart';
 import 'package:wetter/screens/settings.dart';
 
 class NavBar extends StatelessWidget {
@@ -23,6 +24,14 @@ class NavBar extends StatelessWidget {
                   MaterialPageRoute(builder: (context) => const Settings()));
             },
           ),
+          ListTile(
+            leading: const Icon(Icons.public),
+            title: const Text("Locations"),
+            onTap: (() {
+              Navigator.push(context,
+                  MaterialPageRoute(builder: (context) => const Locations()));
+            }),
+          )
         ],
       ),
     );

lib/screens/locations.dart

@@ -0,0 +1,36 @@
+import 'package:flutter/material.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+import 'package:wetter/components/locations/add_location_form.dart';
+
+class Locations extends StatefulWidget {
+  const Locations({super.key});
+
+  @override
+  State<Locations> createState() => _LocationsState();
+}
+
+class _LocationsState extends State<Locations> {
+  late final SharedPreferences? prefs;
+
+  @override
+  void initState() {
+    SharedPreferences.getInstance().then((value) => prefs = value);
+    super.initState();
+  }
+
+  Future<void> initializePreferences() async {
+    prefs = await SharedPreferences.getInstance();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+        appBar: AppBar(
+          title: const Text('Locations'),
+        ),
+        body: Padding(
+          padding: const EdgeInsets.all(20),
+          child: AddLocationsForm(prefs!),
+        ));
+  }
+}

lib/screens/main_weather_view.dart

@@ -41,6 +41,7 @@ class _MainWeatherViewState extends State<MainWeatherView>
 
   @override
   Widget build(BuildContext context) {
+    super.build(context);
     return RefreshIndicator(
         onRefresh: () {
           return Future(() {