implemented task controller in view

lib/example_data.dart

@@ -2,8 +2,10 @@ import 'model/task.dart';
 import 'service/tools.dart' show generateId;
 
 List<Task> tasks = [
-  Task(id: generateId(), title: 'Hund föhnen', position: 0),
-  Task(id: '${generateId()}1', title: 'Fuchs streicheln', position: 1),
-  Task(id: '${generateId()}2', title: 'Katze füttern', position: 2),
-  Task(id: '${generateId()}3', title: 'Bär kraulen', position: 3),
+  Task(id: generateId(), title: 'Hund föhnen'),
+  Task(id: '${generateId()}1', title: 'Fuchs streicheln'),
+  Task(id: '${generateId()}2', title: 'Katze füttern'),
+  Task(id: '${generateId()}3', title: 'Bär kraulen'),
 ];
+
+Iterable<String> taskPositions = tasks.map<String>((e) => e.id);

lib/main.dart

@@ -1,10 +1,22 @@
 import 'package:flutter/material.dart';
 
+import 'model/repositories/local_repository.dart';
 import 'pages/task_edit_page.dart';
 import 'pages/task_overview_page.dart';
+import 'service/controller_scope.dart';
+import 'service/task_controller.dart';
 
-void main() {
-  runApp(const MainApp());
+void main() async {
+  final repository = LocalRepository();
+  WidgetsFlutterBinding.ensureInitialized();
+  await repository.initialize();
+
+  runApp(
+    ControllerScope(
+      controller: TaskController(repository),
+      child: const MainApp(),
+    ),
+  );
 }
 
 class MainApp extends StatelessWidget {

lib/model/callback_models/create_task_request.dart

@@ -38,7 +38,7 @@ class CreateTaskRequest {
       location = task.location,
       url = task.url;
 
-  Task toTask({required String id, required int position}) {
+  Task toTask({required String id}) {
     return Task(
       id: id,
       title: title,
@@ -51,7 +51,6 @@ class CreateTaskRequest {
       alarms: alarms,
       location: location,
       url: url,
-      position: position,
     );
   }
 }

lib/model/extensions/controller_context.dart

@@ -0,0 +1,9 @@
+import 'package:flutter/material.dart';
+
+import '../../service/controller_scope.dart';
+
+extension ControllerContext on BuildContext {
+  T controller<T extends ChangeNotifier>() {
+    return ControllerScope.of<T>(this);
+  }
+}

lib/model/latlng.dart

@@ -4,4 +4,12 @@ class LatLng {
 
   LatLng(this.lat, this.lng);
   LatLng.empty() : lat = 0, lng = 0;
+
+  factory LatLng.fromJson(Map<String, dynamic> json) {
+    return LatLng(json['lat'] as double, json['lng'] as double);
+  }
+
+  Map<String, double> toJson() {
+    return {'lat': lat, 'lng': lng};
+  }
 }

lib/model/location.dart

@@ -11,4 +11,15 @@ class Location {
 
   String get address => _address ?? '';
   LatLng get coordinates => _coordinates ?? LatLng.empty();
+
+  factory Location.fromJson(Map<String, dynamic> json) {
+    return Location(
+      address: json['address'] as String,
+      coordinates: LatLng.fromJson(json['coordinates']),
+    );
+  }
+
+  Map<String, dynamic> toJson() {
+    return {'address': address, 'coordinates': coordinates};
+  }
 }

lib/model/repositories/interfaces/task_repository.dart

@@ -0,0 +1,15 @@
+import '../../task.dart';
+
+abstract class TaskRepository {
+  Future<List<Task>> loadTasks();
+
+  Future<Iterable<String>> loadTaskOrder();
+
+  Future<void> saveTaskOrder(List<String> taskOrder);
+
+  Future<void> saveTask(Task task);
+
+  Future<void> saveTasks(List<Task> tasks);
+
+  Future<void> deleteTask(Task task);
+}

lib/model/repositories/local_repository.dart

@@ -0,0 +1,74 @@
+import 'dart:convert';
+
+import 'package:shared_preferences/shared_preferences.dart';
+
+import '../task.dart';
+import 'interfaces/task_repository.dart';
+
+class LocalRepository implements TaskRepository {
+  static const String _tasksKey = 'tasks';
+  static const String _taskOrderKey = 'taskOrder';
+  SharedPreferencesWithCache? _prefs;
+
+  Future<void> initialize() async {
+    if (_prefs == null) {
+      await SharedPreferencesWithCache.create(
+        cacheOptions: const SharedPreferencesWithCacheOptions(
+          allowList: <String>{_tasksKey, _taskOrderKey},
+        ),
+      ).then((value) => _prefs = value);
+    }
+  }
+
+  // Create
+
+  @override
+  Future<void> saveTask(Task task) async {
+    final tasks = await loadTasks();
+    if (tasks.contains(task)) {
+      tasks.remove(task);
+    } else {
+      final taskOrder = (await loadTaskOrder()).toList();
+      taskOrder.add(task.id);
+      await saveTaskOrder(taskOrder);
+    }
+    tasks.add(task);
+    return saveTasks(tasks);
+  }
+
+  @override
+  Future<void> saveTasks(List<Task> tasks) async {
+    final jsonList = tasks.map<String>((e) => jsonEncode(e.toJson())).toList();
+    return _prefs!.setStringList(_tasksKey, jsonList);
+  }
+
+  @override
+  Future<void> saveTaskOrder(Iterable<String> taskOrder) {
+    final jsonList = taskOrder.map<String>((e) => jsonEncode(e)).toList();
+    return _prefs!.setStringList(_taskOrderKey, jsonList);
+  }
+
+  // Read
+
+  @override
+  Future<Iterable<String>> loadTaskOrder() async {
+    final Iterable<String> jsonList =
+        _prefs!.getStringList(_taskOrderKey) ?? [];
+    return jsonList.map<String>((e) => jsonDecode(e));
+  }
+
+  @override
+  Future<List<Task>> loadTasks() async {
+    final Iterable<String> jsonList = _prefs!.getStringList(_tasksKey) ?? [];
+    return jsonList.map<Task>((e) => Task.fromJson(jsonDecode(e))).toList();
+  }
+
+  // Delete
+
+  @override
+  Future<void> deleteTask(Task task) async {
+    final tasks = await loadTasks();
+    tasks.remove(task);
+    saveTasks(tasks);
+  }
+}

lib/model/task.dart

@@ -12,7 +12,6 @@ class Task {
   final List<DateTime> alarms;
   final Location? location;
   final String url;
-  final int position;
 
   Task({
     required this.id,
@@ -26,7 +25,6 @@ class Task {
     this.alarms = const [],
     this.location,
     this.url = '',
-    required this.position,
   });
 
   Task copyWith({
@@ -41,7 +39,6 @@ class Task {
     List<DateTime>? alarms,
     Location? location,
     String? url,
-    int? position,
   }) {
     return Task(
       id: id ?? this.id,
@@ -55,7 +52,60 @@ class Task {
       alarms: alarms ?? this.alarms,
       location: location ?? this.location,
       url: url ?? this.url,
-      position: position ?? this.position,
     );
   }
+
+  factory Task.fromJson(Map<String, dynamic> json) {
+    return Task(
+      id: json['id'] as String,
+      title: json['title'] as String,
+      description: json['description'] as String? ?? '',
+      start: json['start'] != null
+          ? DateTime.parse(json['start'] as String)
+          : null,
+      due: json['due'] != null ? DateTime.parse(json['due'] as String) : null,
+      isCompleted: json['isCompleted'] as bool? ?? false,
+      category: json['category'] as String? ?? '',
+      subtasks:
+          (json['subtasks'] as List<dynamic>?)
+              ?.map((e) => Task.fromJson(e as Map<String, dynamic>))
+              .toList() ??
+          [],
+      alarms:
+          (json['alarms'] as List<dynamic>?)
+              ?.map((e) => DateTime.parse(e as String))
+              .toList() ??
+          [],
+      location: json['location'] != null
+          ? Location.fromJson(json['location'] as Map<String, dynamic>)
+          : null,
+      url: json['url'] as String? ?? '',
+    );
+  }
+
+  Map<String, dynamic> toJson() {
+    return {
+      'id': id,
+      'title': title,
+      'description': description,
+      'start': start?.toIso8601String(),
+      'due': due?.toIso8601String(),
+      'isCompleted': isCompleted,
+      'category': category,
+      'subtasks': subtasks.map((e) => e.toJson()).toList(),
+      'alarms': alarms.map((e) => e.toIso8601String()).toList(),
+      'location': location?.toJson(),
+      'url': url,
+    };
+  }
+
+  @override
+  bool operator ==(Object other) {
+    if (other is! Task) return false;
+
+    return hashCode == other.hashCode;
+  }
+
+  @override
+  int get hashCode => id.hashCode;
 }

lib/pages/task_overview_page.dart

@@ -1,8 +1,9 @@
 import 'package:flutter/material.dart';
 
-import '../example_data.dart';
 import '../model/callback_models/create_task_request.dart';
+import '../model/extensions/controller_context.dart';
 import '../model/task.dart';
+import '../service/task_controller.dart';
 import '../service/tools.dart';
 import 'task_edit_page.dart';
 
@@ -15,7 +16,8 @@ class TaskOverviewPage extends StatefulWidget {
 }
 
 class _TaskOverviewPageState extends State<TaskOverviewPage> {
-  //TODO: Replace example data call
+  List<Task> get tasks => context.controller<TaskController>().orderedTasks;
+
   @override
   Widget build(BuildContext context) {
     return Scaffold(
@@ -23,8 +25,7 @@ class _TaskOverviewPageState extends State<TaskOverviewPage> {
       body: ReorderableListView.builder(
         itemBuilder: itemBuilder,
         itemCount: tasks.length,
-        onReorderItem: (oldIndex, newIndex) =>
-            reorderList(tasks, oldIndex, newIndex),
+        onReorderItem: context.controller<TaskController>().reorderTask,
       ),
       floatingActionButton: FloatingActionButton(
         onPressed: onCreateTaskTapped,
@@ -42,10 +43,10 @@ class _TaskOverviewPageState extends State<TaskOverviewPage> {
       subtitle: Text(task.description),
       onTap: () async {
         final result = await onTaskTapped(task);
-        if (result != null) {
-          tasks.remove(task);
-          tasks.add(result.toTask(id: task.id, position: task.position));
-          setState(() {});
+        if (result != null && context.mounted) {
+          context.controller<TaskController>().saveTask(
+            result.toTask(id: task.id),
+          );
         }
       },
     );
@@ -58,28 +59,15 @@ class _TaskOverviewPageState extends State<TaskOverviewPage> {
     return result as CreateTaskRequest?;
   }
 
-  List<Task> reorderList(List<Task> tasks, oldIndex, newIndex) {
-    final item = tasks.removeAt(oldIndex);
-    tasks.insert(newIndex, item);
-
-    final List<Task> reordered = [];
-
-    for (int i = 0; i < tasks.length; i++) {
-      reordered.add(tasks.elementAt(i).copyWith(position: i));
-    }
-
-    return reordered;
-  }
-
   void onCreateTaskTapped() async {
-    //TODO: example data call
     final result =
         await Navigator.of(context).pushNamed(TaskEditPage.routeName)
             as CreateTaskRequest?;
 
-    if (result != null) {
-      tasks.add(result.toTask(id: generateId(), position: tasks.length));
-      setState(() {});
+    if (result != null && context.mounted) {
+      context.controller<TaskController>().saveTask(
+        result.toTask(id: generateId()),
+      );
     }
   }
 }

lib/service/controller_scope.dart

@@ -0,0 +1,18 @@
+import 'package:flutter/widgets.dart';
+
+class ControllerScope<T extends ChangeNotifier> extends InheritedNotifier<T> {
+  const ControllerScope({
+    super.key,
+    required T controller,
+    required super.child,
+  }) : super(notifier: controller);
+
+  static T of<T extends ChangeNotifier>(BuildContext context) {
+    final scope = context
+        .dependOnInheritedWidgetOfExactType<ControllerScope<T>>();
+
+    assert(scope != null, 'No ControllerScope<$T> found in context');
+
+    return scope!.notifier!;
+  }
+}

lib/service/task_controller.dart

@@ -0,0 +1,49 @@
+import 'package:flutter/material.dart' show ChangeNotifier;
+
+import '../model/repositories/interfaces/task_repository.dart';
+import '../model/task.dart';
+
+class TaskController extends ChangeNotifier {
+  TaskController(TaskRepository repository) : _repository = repository {
+    Future.wait([
+      _loadTaskOrder(),
+      _loadTasks(),
+    ]).whenComplete(() => notifyListeners());
+  }
+
+  final TaskRepository _repository;
+
+  final List<Task> _tasks = [];
+  final List<String> _taskOrder = [];
+
+  List<Task> get orderedTasks {
+    final lookup = {for (final task in _tasks) task.id: task};
+
+    return _taskOrder.map((id) => lookup[id]!).toList();
+  }
+
+  Future<void> reorderTask(int oldIndex, int newIndex) async {
+    final taskId = _taskOrder.removeAt(oldIndex);
+    _taskOrder.insert(newIndex, taskId);
+    _repository.saveTaskOrder(_taskOrder);
+  }
+
+  Future<void> saveTask(Task task) async {
+    await _repository.saveTask(task);
+    await _loadTasks();
+    await _loadTaskOrder();
+    notifyListeners();
+  }
+
+  Future<void> _loadTasks() async {
+    _tasks.clear();
+    return _repository.loadTasks().then((value) => _tasks.addAll(value));
+  }
+
+  Future<void> _loadTaskOrder() async {
+    _taskOrder.clear();
+    return _repository.loadTaskOrder().then(
+      (value) => _taskOrder.addAll(value),
+    );
+  }
+}

pubspec.lock

@@ -49,6 +49,22 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.3.3"
+  ffi:
+    dependency: transitive
+    description:
+      name: ffi
+      sha256: "6d7fd89431262d8f3125e81b50d3847a091d846eafcd4fdb88dd06f36d705a45"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.2.0"
+  file:
+    dependency: transitive
+    description:
+      name: file
+      sha256: a3b4f84adafef897088c160faf7dfffb7696046cb13ae90b508c2cbc95d3b8d4
+      url: "https://pub.dev"
+    source: hosted
+    version: "7.0.1"
   flutter:
     dependency: "direct main"
     description: flutter
@@ -67,6 +83,11 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
+  flutter_web_plugins:
+    dependency: transitive
+    description: flutter
+    source: sdk
+    version: "0.0.0"
   leak_tracker:
     dependency: transitive
     description:
@@ -131,6 +152,102 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.9.1"
+  path_provider_linux:
+    dependency: transitive
+    description:
+      name: path_provider_linux
+      sha256: f7a1fe3a634fe7734c8d3f2766ad746ae2a2884abe22e241a8b301bf5cac3279
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.2.1"
+  path_provider_platform_interface:
+    dependency: transitive
+    description:
+      name: path_provider_platform_interface
+      sha256: "88f5779f72ba699763fa3a3b06aa4bf6de76c8e5de842cf6f29e2e06476c2334"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.2"
+  path_provider_windows:
+    dependency: transitive
+    description:
+      name: path_provider_windows
+      sha256: bd6f00dbd873bfb70d0761682da2b3a2c2fccc2b9e84c495821639601d81afe7
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.3.0"
+  platform:
+    dependency: transitive
+    description:
+      name: platform
+      sha256: "5d6b1b0036a5f331ebc77c850ebc8506cbc1e9416c27e59b439f917a902a4984"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.1.6"
+  plugin_platform_interface:
+    dependency: transitive
+    description:
+      name: plugin_platform_interface
+      sha256: "4820fbfdb9478b1ebae27888254d445073732dae3d6ea81f0b7e06d5dedc3f02"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.8"
+  shared_preferences:
+    dependency: "direct main"
+    description:
+      name: shared_preferences
+      sha256: c3025c5534b01739267eb7d76959bbc25a6d10f6988e1c2a3036940133dd10bf
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.5.5"
+  shared_preferences_android:
+    dependency: transitive
+    description:
+      name: shared_preferences_android
+      sha256: "93ae5884a9df5d3bb696825bceb3a17590754548b5d740eba51500afc8d088f5"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.4.26"
+  shared_preferences_foundation:
+    dependency: transitive
+    description:
+      name: shared_preferences_foundation
+      sha256: "4e7eaffc2b17ba398759f1151415869a34771ba11ebbccd1b0145472a619a64f"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.5.6"
+  shared_preferences_linux:
+    dependency: transitive
+    description:
+      name: shared_preferences_linux
+      sha256: "580abfd40f415611503cae30adf626e6656dfb2f0cee8f465ece7b6defb40f2f"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.4.1"
+  shared_preferences_platform_interface:
+    dependency: transitive
+    description:
+      name: shared_preferences_platform_interface
+      sha256: "649dc798a33931919ea356c4305c2d1f81619ea6e92244070b520187b5140ef9"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.4.2"
+  shared_preferences_web:
+    dependency: transitive
+    description:
+      name: shared_preferences_web
+      sha256: c49bd060261c9a3f0ff445892695d6212ff603ef3115edbb448509d407600019
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.4.3"
+  shared_preferences_windows:
+    dependency: transitive
+    description:
+      name: shared_preferences_windows
+      sha256: "94ef0f72b2d71bc3e700e025db3710911bd51a71cefb65cc609dd0d9a982e3c1"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.4.1"
   sky_engine:
     dependency: transitive
     description: flutter
@@ -200,6 +317,22 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "15.2.0"
+  web:
+    dependency: transitive
+    description:
+      name: web
+      sha256: "868d88a33d8a87b18ffc05f9f030ba328ffefba92d6c127917a2ba740f9cfe4a"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.1.1"
+  xdg_directories:
+    dependency: transitive
+    description:
+      name: xdg_directories
+      sha256: "7a3f37b05d989967cdddcbb571f1ea834867ae2faa29725fd085180e0883aa15"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.1.0"
 sdks:
   dart: ">=3.12.1 <4.0.0"
-  flutter: ">=3.18.0-18.0.pre.54"
+  flutter: ">=3.44.0"

pubspec.yaml

@@ -9,6 +9,7 @@ environment:
 dependencies:
   flutter:
     sdk: flutter
+  shared_preferences: ^2.5.5
 
 dev_dependencies:
   flutter_test: