Load user preferences at start of app. Manage locations: user is able to add locations by lat and lon to shared preferences

lib/screens/locations.dart

@@ -1,6 +1,7 @@
 import 'package:flutter/material.dart';
-import 'package:shared_preferences/shared_preferences.dart';
 import 'package:wetter/components/locations/add_location_form.dart';
+import 'package:wetter/components/locations/manage_single_location.dart';
+import 'package:wetter/services/user_preferences.dart';
 
 class Locations extends StatefulWidget {
   const Locations({super.key});
@@ -10,18 +11,21 @@ class Locations extends StatefulWidget {
 }
 
 class _LocationsState extends State<Locations> {
-  late final SharedPreferences? prefs;
-
+  List<String> locations = [];
   @override
   void initState() {
-    SharedPreferences.getInstance().then((value) => prefs = value);
+    locations = UserPreferences.getSavedLocations();
     super.initState();
   }
 
-  Future<void> initializePreferences() async {
-    prefs = await SharedPreferences.getInstance();
+  void saveNewLocation(String name, double lat, double lon) {
+    setState(() {
+      locations = UserPreferences.saveNewLocation(name, lat, lon);
+    });
   }
 
+  void deleteLocation(String name) {}
+
   @override
   Widget build(BuildContext context) {
     return Scaffold(
@@ -29,8 +33,20 @@ class _LocationsState extends State<Locations> {
           title: const Text('Locations'),
         ),
         body: Padding(
-          padding: const EdgeInsets.all(20),
-          child: AddLocationsForm(prefs!),
-        ));
+            padding: const EdgeInsets.all(20),
+            child: Center(
+                child: Column(
+                    mainAxisAlignment: MainAxisAlignment.spaceEvenly,
+                    children: [
+                  for (String name in locations)
+                    ManageSingleLocation(name: name, delete: deleteLocation),
+                  ...[
+                    Expanded(
+                      child: AddLocationsForm(
+                          saveNewLocation: saveNewLocation,
+                          savedLocations: locations),
+                    )
+                  ],
+                ]))));
   }
 }