Added central user credentials management

lib/main.dart

@@ -4,10 +4,10 @@ import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:jiffy/jiffy.dart';
 import 'package:provider/provider.dart';
-import 'package:shared_preferences/shared_preferences.dart';
 import 'package:flutter_localizations/flutter_localizations.dart';
 
 import 'app.dart';
+import 'model/accountData.dart';
 import 'model/accountModel.dart';
 import 'model/chatList/chatListProps.dart';
 import 'model/chatList/chatProps.dart';
@@ -18,7 +18,7 @@ import 'storage/base/settingsProvider.dart';
 import 'theming/darkAppTheme.dart';
 import 'theming/lightAppTheme.dart';
 import 'view/login/login.dart';
-import 'widget/errorView.dart';
+import 'widget/placeholderView.dart';
 
 Future<void> main() async {
   WidgetsFlutterBinding.ensureInitialized();
@@ -27,7 +27,7 @@ Future<void> main() async {
   SecurityContext.defaultContext.setTrustedCertificatesBytes(data.buffer.asUint8List());
 
   ErrorWidget.builder = (error) {
-    return ErrorView(icon: Icons.phonelink_erase_rounded, text: error.toString());
+    return PlaceholderView(icon: Icons.phonelink_erase_rounded, text: error.toString());
   };
 
   runApp(
@@ -56,66 +56,54 @@ class Main extends StatefulWidget {
 }
 
 class _MainState extends State<Main> {
-
-  final Future<SharedPreferences> _storage = SharedPreferences.getInstance();
-
   @override
   void initState() {
-    super.initState();
     Jiffy.setLocale("de");
-    _storage.then((SharedPreferences preferences) => preferences.getBool("loggedIn") ?? false).then((value) => {
-      if(value) {
-        Provider.of<AccountModel>(context, listen: false).login()
-      } else {
-        Provider.of<AccountModel>(context, listen: false).logout()
-      }
+
+    SystemChrome.setPreferredOrientations([DeviceOrientation.portraitUp, DeviceOrientation.portraitDown]);
+
+    AccountData().waitForPopulation().then((value) {
+      Provider.of<AccountModel>(context, listen: false)
+          .setState(value ? AccountModelState.loggedIn : AccountModelState.loggedOut);
     });
 
+    super.initState();
   }
 
   @override
   Widget build(BuildContext context) {
-    SystemChrome.setPreferredOrientations([DeviceOrientation.portraitUp]);
-
     return Directionality(
       textDirection: TextDirection.ltr,
       child: Consumer<SettingsProvider>(
         builder: (context, settings, child) {
           return MaterialApp(
-              debugShowCheckedModeBanner: false,
-              localizationsDelegates: const [
-                ...GlobalMaterialLocalizations.delegates,
-                GlobalWidgetsLocalizations.delegate,
-              ],
-              supportedLocales: const [
-                Locale('de'),
-                Locale('en'),
-              ],
-              locale: const Locale('de'),
+            debugShowCheckedModeBanner: false,
+            localizationsDelegates: const [
+              ...GlobalMaterialLocalizations.delegates,
+              GlobalWidgetsLocalizations.delegate,
+            ],
+            supportedLocales: const [
+              Locale('de'),
+              Locale('en'),
+            ],
+            locale: const Locale('de'),
+
+            title: 'Marianum Fulda',
+
+            themeMode: settings.val().appTheme,
+            theme: LightAppTheme.theme,
+            darkTheme: DarkAppTheme.theme,
 
 
-              title: 'Marianum Fulda',
-
-              themeMode: settings.val().appTheme,
-              theme: LightAppTheme.theme,
-              darkTheme: DarkAppTheme.theme,
-
-
-              home: FutureBuilder<SharedPreferences>(
-                future: _storage,
-                builder: (BuildContext context, AsyncSnapshot<SharedPreferences> snapshot) {
-
-                  if(snapshot.hasData) {
-                    return Consumer<AccountModel>(
-                      builder: (context, accountModel, child) {
-                        return accountModel.isLoggedIn ? const App() : const Login();
-                      },
-                    );
-                  } else {
-                    return const Center(child: CircularProgressIndicator());
-                  }
-                },
-              )
+            home: Consumer<AccountModel>(
+              builder: (context, accountModel, child) {
+                switch(accountModel.state) {
+                  case AccountModelState.loggedIn: return const App();
+                  case AccountModelState.loggedOut: return const Login();
+                  case AccountModelState.undefined: return const PlaceholderView(icon: Icons.timer, text: "Daten werden geladen");
+                }
+              },
+            ),
           );
         },
       ),