fixed possible lockups on app start

2026-09-11 12:04:32 +02:00
parent 43dfc52bc7
commit 3734d7ff2c
7 changed files with 452 additions and 173 deletions
@@ -0,0 +1,74 @@
+import 'dart:async';
+
+import 'package:flutter/material.dart';
+
+import '../../model/account_data.dart';
+import '../../theming/light_app_theme.dart';
+import '../../widget/app_progress_indicator.dart';
+
+/// Shown while the stored session is still being read. Normally gone within
+/// a second; after [hintDelay] it offers a way out so a keychain that keeps
+/// failing can never trap the user on a spinner.
+class AccountLoadingScreen extends StatefulWidget {
+  const AccountLoadingScreen({super.key});
+
+  static const Duration hintDelay = Duration(seconds: 15);
+
+  @override
+  State<AccountLoadingScreen> createState() => _AccountLoadingScreenState();
+}
+
+class _AccountLoadingScreenState extends State<AccountLoadingScreen> {
+  Timer? _hintTimer;
+  bool _showHint = false;
+
+  @override
+  void initState() {
+    super.initState();
+    _hintTimer = Timer(AccountLoadingScreen.hintDelay, () {
+      if (mounted) setState(() => _showHint = true);
+    });
+  }
+
+  @override
+  void dispose() {
+    _hintTimer?.cancel();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) => Scaffold(
+    backgroundColor: LightAppTheme.marianumRed,
+    body: Center(
+      child: Padding(
+        padding: const EdgeInsets.symmetric(horizontal: 32),
+        child: Column(
+          mainAxisAlignment: MainAxisAlignment.center,
+          children: [
+            const AppProgressIndicator.large(color: Colors.white),
+            const SizedBox(height: 16),
+            const Text(
+              'Konto wird geladen…',
+              style: TextStyle(color: Colors.white),
+            ),
+            if (_showHint) ...[
+              const SizedBox(height: 32),
+              const Text(
+                'Das dauert länger als üblich. Die gespeicherte Anmeldung '
+                'konnte noch nicht gelesen werden.',
+                textAlign: TextAlign.center,
+                style: TextStyle(color: Colors.white70),
+              ),
+              const SizedBox(height: 8),
+              TextButton(
+                onPressed: AccountData().abandonLoad,
+                style: TextButton.styleFrom(foregroundColor: Colors.white),
+                child: const Text('Zur Anmeldung'),
+              ),
+            ],
+          ],
+        ),
+      ),
+    ),
+  );
+}