created minimal view to show tasks

lib/example_data.dart

@@ -0,0 +1,9 @@
+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),
+];

lib/main.dart

@@ -1,5 +1,7 @@
 import 'package:flutter/material.dart';
 
+import 'model/pages/task_overview.dart';
+
 void main() {
   runApp(const MainApp());
 }
@@ -9,8 +11,9 @@ class MainApp extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    return const MaterialApp(
-      home: Scaffold(body: Center(child: Text('Hello World!'))),
+    return MaterialApp(
+      routes: {TaskOverview.routeName: (context) => TaskOverview()},
+      initialRoute: TaskOverview.routeName,
     );
   }
 }

lib/model/pages/task_overview.dart

@@ -0,0 +1,51 @@
+import 'package:flutter/material.dart';
+
+import '../../example_data.dart';
+import '../task.dart';
+
+class TaskOverview extends StatefulWidget {
+  static const String routeName = '/';
+  const TaskOverview({super.key});
+
+  @override
+  State<TaskOverview> createState() => _TaskOverviewState();
+}
+
+class _TaskOverviewState extends State<TaskOverview> {
+  //TODO: Replace example data call
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(),
+      body: ReorderableListView.builder(
+        itemBuilder: itemBuilder,
+        itemCount: tasks.length,
+        onReorderItem: (oldIndex, newIndex) =>
+            reorderList(tasks, oldIndex, newIndex),
+      ),
+    );
+  }
+
+  Widget itemBuilder(BuildContext context, int index) {
+    final task = tasks.elementAt(index);
+
+    return ListTile(
+      key: Key(task.id),
+      title: Text(task.title),
+      subtitle: Text(task.description),
+    );
+  }
+
+  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;
+  }
+}

lib/model/task.dart

@@ -12,6 +12,7 @@ class Task {
   final List<DateTime> alarms;
   final Location? location;
   final String url;
+  final int position;
 
   Task({
     required this.id,
@@ -25,5 +26,36 @@ class Task {
     this.alarms = const [],
     this.location,
     this.url = '',
+    required this.position,
   });
+
+  Task copyWith({
+    String? id,
+    String? title,
+    String? description,
+    DateTime? start,
+    DateTime? due,
+    bool? isCompleted,
+    String? category,
+    List<Task>? subtasks,
+    List<DateTime>? alarms,
+    Location? location,
+    String? url,
+    int? position,
+  }) {
+    return Task(
+      id: id ?? this.id,
+      title: title ?? this.title,
+      description: description ?? this.description,
+      start: start ?? this.start,
+      due: due ?? this.due,
+      isCompleted: isCompleted ?? this.isCompleted,
+      category: category ?? this.category,
+      subtasks: subtasks ?? this.subtasks,
+      alarms: alarms ?? this.alarms,
+      location: location ?? this.location,
+      url: url ?? this.url,
+      position: position ?? this.position,
+    );
+  }
 }

lib/service/tools.dart

@@ -0,0 +1 @@
+String generateId() => DateTime.now().millisecondsSinceEpoch.toString();