LabWork02 ToDo List is done

lib/add_task_dialog.dart

@@ -0,0 +1,116 @@
+import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
+import 'task_provider.dart';
+import 'task_model.dart';
+import 'package:intl/intl.dart';
+
+class AddTaskDialog extends StatefulWidget {
+  @override
+  _AddTaskDialogState createState() => _AddTaskDialogState();
+}
+
+class _AddTaskDialogState extends State<AddTaskDialog> {
+  final _formKey = GlobalKey<FormState>();
+  String _title = '';
+  String? _description;
+  String? _category;
+  DateTime? _selectedDeadline;
+  TaskPriority _selectedPriority = TaskPriority.medium;
+
+  @override
+  Widget build(BuildContext context) {
+    return AlertDialog(
+      title: Text('Add New Task'),
+      content: Form(
+        key: _formKey,
+        child: Column(
+          mainAxisSize: MainAxisSize.min,
+          children: [
+            TextFormField(
+              decoration: InputDecoration(labelText: 'Task Title*'),
+              validator: (value) {
+                if (value == null || value.isEmpty) {
+                  return 'Please enter a task title';
+                }
+                return null;
+              },
+              onSaved: (value) {
+                _title = value ?? '';
+              },
+            ),
+            TextFormField(
+              decoration: InputDecoration(labelText: 'Description (optional)'),
+              onSaved: (value) {
+                _description = value;
+              },
+            ),
+            TextFormField(
+              decoration: InputDecoration(labelText: 'Category (optional)'),
+              onSaved: (value) {
+                _category = value;
+              },
+            ),
+            SizedBox(height: 20),
+            Text('Deadline: ${_selectedDeadline != null ? DateFormat('yMMMd').format(_selectedDeadline!) : 'No deadline'}'),
+            ElevatedButton(
+              child: Text('Select Deadline'),
+              onPressed: () => _selectDeadline(context),
+            ),
+            DropdownButton<TaskPriority>(
+              value: _selectedPriority,
+              onChanged: (TaskPriority? newValue) {
+                setState(() {
+                  _selectedPriority = newValue!;
+                });
+              },
+              items: TaskPriority.values.map((TaskPriority priority) {
+                return DropdownMenuItem<TaskPriority>(
+                  value: priority,
+                  child: Text(priority.toString().split('.').last),
+                );
+              }).toList(),
+            ),
+          ],
+        ),
+      ),
+      actions: [
+        TextButton(
+          child: Text('Cancel'),
+          onPressed: () {
+            Navigator.of(context).pop();
+          },
+        ),
+        ElevatedButton(
+          child: Text('Add Task'),
+          onPressed: () {
+            if (_formKey.currentState!.validate()) {
+              _formKey.currentState!.save();
+              Provider.of<TaskProvider>(context, listen: false).addTask(
+                title: _title,
+                description: _description,
+                category: _category,
+                deadline: _selectedDeadline,
+                priority: _selectedPriority,
+              );
+              Navigator.of(context).pop();
+            }
+          },
+        ),
+      ],
+    );
+  }
+
+  Future<void> _selectDeadline(BuildContext context) async {
+    final DateTime? picked = await showDatePicker(
+      context: context,
+      initialDate: DateTime.now(),
+      firstDate: DateTime.now(),
+      lastDate: DateTime(2100),
+    );
+    if (picked != null) {
+      setState(() {
+        _selectedDeadline = picked;
+      });
+    }
+  }
+}

lib/datetime_extension.dart

@@ -0,0 +1,19 @@
+extension DateTimeFormatting on DateTime {
+  // Форматирует дату как "DD/MM/YYYY"
+  String toFormattedDate() {
+    return "${this.day.toString().padLeft(2, '0')}/${this.month.toString().padLeft(2, '0')}/${this.year}";
+  }
+
+  // Форматирует как "x дней осталось"
+  String toDaysLeft() {
+    final now = DateTime.now();
+    final difference = this.difference(now).inDays;
+    if (difference < 0) {
+      return "Overdue by ${difference.abs()} days";
+    } else if (difference == 0) {
+      return "Due today";
+    } else {
+      return "Due in $difference days";
+    }
+  }
+}

lib/main.dart

@@ -1,101 +1,29 @@
-import 'dart:math';
-
 import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
+import 'task_provider.dart';
+import 'task_list_screen.dart';
 
 void main() {
-  runApp(const MyApp());
+  runApp(
+    MultiProvider(
+      providers: [
+        ChangeNotifierProvider(create: (_) => TaskProvider()),
+      ],
+      child: MyApp(),
+    ),
+  );
 }
 
 class MyApp extends StatelessWidget {
-  const MyApp({super.key});
-
   @override
   Widget build(BuildContext context) {
     return MaterialApp(
-      title: 'Flutter Demo',
+      title: 'ToDo List',
       debugShowCheckedModeBanner: false,
       theme: ThemeData(
-        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
-        useMaterial3: true,
-      ),
-      home: const MyHomePage(title: 'Flutter Demo Home Page'),
-    );
-  }
-}
-
-class MyHomePage extends StatefulWidget {
-  const MyHomePage({super.key, required this.title});
-
-  final String title;
-
-  @override
-  State<MyHomePage> createState() => _MyHomePageState();
-}
-
-class _MyHomePageState extends State<MyHomePage> {
-  int _counter = 0;
-  Color _color = Colors.orangeAccent;
-
-  void _incrementCounter() {
-    setState(() {
-      _counter++;
-      _color =
-          Color((Random().nextDouble() * 0xFFFFFF).toInt()).withOpacity(1.0);
-    });
-  }
-
-  @override
-  Widget build(BuildContext context) {
-    return Scaffold(
-      appBar: AppBar(
-        backgroundColor: _color,
-        title: Column(
-          mainAxisAlignment: MainAxisAlignment.center,
-          crossAxisAlignment: CrossAxisAlignment.start,
-          children: const [
-            Text(
-              'Masenkin',
-              style: TextStyle(
-                fontSize: 20,
-                fontWeight: FontWeight.bold,
-              ),
-            ),
-            Text(
-              'Maksim Sergeevich',
-              style: TextStyle(
-                fontSize: 12,
-                fontWeight: FontWeight.normal,
-              ),
-            ),
-          ],
-        ),
-      ),
-      body: Center(
-        child: Column(
-          mainAxisAlignment: MainAxisAlignment.center,
-          children: <Widget>[
-            const Text(
-              'You have pushed the button this many times:',
-            ),
-            Text(
-              '$_counter',
-              style: Theme.of(context).textTheme.headlineMedium,
-            ),
-            if (_counter > 10)
-              Text(
-                'STOP CLICKING! \nIT\'S NOT HAMSTER COMBAT',
-                style: Theme.of(context).textTheme.headlineMedium,
-                textAlign: TextAlign.center,
-              ),
-          ],
-        ),
-      ),
-      floatingActionButton: FloatingActionButton(
-        onPressed: _incrementCounter,
-        backgroundColor: _color,
-        tooltip: 'Increment',
-        child: const Icon(Icons.mood),
+        primarySwatch: Colors.blue,
       ),
+      home: TaskListScreen(),
     );
   }
 }

lib/task_details_screen.dart

@@ -0,0 +1,55 @@
+import 'package:flutter/material.dart';
+import 'task_model.dart';
+import 'datetime_extension.dart';
+
+class TaskDetailsScreen extends StatelessWidget {
+  final Task task;
+
+  TaskDetailsScreen({required this.task});
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: Text(task.title),
+      ),
+      body: Padding(
+        padding: const EdgeInsets.all(16.0),
+        child: Column(
+          crossAxisAlignment: CrossAxisAlignment.start,
+          children: [
+            Text(
+              'Category: ${task.category ?? 'Not specified'}',
+              style: TextStyle(fontSize: 16),
+            ),
+            SizedBox(height: 8),
+            Text(
+              'Priority: ${task.priority.name}',
+              style: TextStyle(fontSize: 16),
+            ),
+            SizedBox(height: 8),
+            Text(
+              'Deadline: ${task.deadline != null ? task.deadline!.toFormattedDate() : 'No deadline'}',
+              style: TextStyle(fontSize: 16),
+            ),
+            SizedBox(height: 16),
+            Text(
+              'Description:',
+              style: TextStyle(fontSize: 18, fontWeight: FontWeight.bold),
+            ),
+            SizedBox(height: 8),
+            Text(
+              task.description ?? 'No description available',
+              style: TextStyle(fontSize: 16),
+            ),
+            SizedBox(height: 16),
+            Text(
+              'Completed: ${task.isCompleted ? "Yes" : "No"}',
+              style: TextStyle(fontSize: 16),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}

lib/task_list_screen.dart

@@ -0,0 +1,108 @@
+import 'dart:math';
+import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
+import 'task_provider.dart';
+import 'task_details_screen.dart';
+import 'add_task_dialog.dart';
+import 'task_model.dart';
+import 'datetime_extension.dart';
+
+class TaskListScreen extends StatefulWidget {
+  @override
+  _TaskListScreenState createState() => _TaskListScreenState();
+}
+
+class _TaskListScreenState extends State<TaskListScreen> {
+  Color _color = Colors.transparent;
+
+  @override
+  void initState() {
+    super.initState();
+    Provider.of<TaskProvider>(context, listen: false).loadTasks();
+    _color =
+        Color((Random().nextDouble() * 0xFFFFFF).toInt()).withOpacity(1.0);
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        backgroundColor: _color,
+        title: Column(
+          crossAxisAlignment:
+              CrossAxisAlignment.start, // Чтобы текст выровнялся по левому краю
+          children: [
+            Text('ToDo List',
+                style: TextStyle(fontSize: 20, fontWeight: FontWeight.bold)),
+            Text(
+              'made by Factorino',
+              style: TextStyle(
+                fontSize: 12, // Размер шрифта для подписи
+                fontStyle: FontStyle.italic, // Сделаем текст курсивом
+              ),
+            ),
+          ],
+        ),
+        actions: [
+          IconButton(
+            icon: Icon(Icons.sort),
+            onPressed: () {
+              context.read<TaskProvider>().sortTasks();
+            },
+          ),
+        ],
+      ),
+      body: Consumer<TaskProvider>(
+        builder: (context, taskProvider, child) {
+          if (taskProvider.tasks.isEmpty) {
+            return Center(child: Text('No tasks yet.'));
+          }
+
+          return ListView.builder(
+            itemCount: taskProvider.tasks.length,
+            itemBuilder: (context, index) {
+              Task task = taskProvider.tasks[index];
+              return ListTile(
+                title: Text(task.title),
+                subtitle: Text(
+                    '${task.category ?? 'No category'} - ${task.deadline?.toFormattedDate() ?? 'No deadline'}'),
+                trailing: Checkbox(
+                  value: task.isCompleted,
+                  onChanged: (value) {
+                    context.read<TaskProvider>().toggleTaskCompletion(task);
+                  },
+                ),
+                onTap: () {
+                  // Открываем экран с деталями задачи
+                  Navigator.push(
+                    context,
+                    MaterialPageRoute(
+                      builder: (context) => TaskDetailsScreen(task: task),
+                    ),
+                  );
+                },
+                onLongPress: () {
+                  context.read<TaskProvider>().removeTask(task);
+                },
+              );
+            },
+          );
+        },
+      ),
+      floatingActionButton: FloatingActionButton(
+        onPressed: () => _openAddTaskDialog(context),
+        backgroundColor: _color,
+        child: Icon(Icons.add),
+      ),
+    );
+  }
+
+  void _openAddTaskDialog(BuildContext context) {
+    showDialog(
+      context: context,
+      builder: (BuildContext context) {
+        return AddTaskDialog();
+      },
+    );
+  }
+}

lib/task_model.dart

@@ -0,0 +1,23 @@
+enum TaskPriority {
+  low,
+  medium,
+  high
+}
+
+class Task {
+  final String title;
+  final String? description;
+  final String? category;
+  final DateTime? deadline;
+  bool isCompleted;
+  TaskPriority priority;
+
+  Task({
+    required this.title,
+    this.description,
+    this.category,
+    this.deadline,
+    this.isCompleted = false,
+    this.priority = TaskPriority.medium,
+  });
+}

lib/task_provider.dart

@@ -0,0 +1,94 @@
+import 'package:flutter/material.dart';
+import 'task_model.dart';
+
+class TaskProvider with ChangeNotifier {
+  List<Task> _tasks = <Task>[];
+
+  List<Task> get tasks => _tasks;
+
+  // Добавление задачи
+  void addTask({
+    required String title,
+    String? description,
+    String? category,
+    DateTime? deadline,
+    TaskPriority priority = TaskPriority.medium,
+  }) {
+    final task = Task(
+      title: title,
+      description: description,
+      category: category,
+      deadline: deadline,
+      priority: priority,
+    );
+    _tasks.add(task);
+    notifyListeners();
+  }
+
+  // Удаление задачи
+  void removeTask(Task task) {
+    _tasks.remove(task);
+    notifyListeners();
+  }
+
+  // Изменение состояния задачи
+  void toggleTaskCompletion(Task task) {
+    task.isCompleted = !task.isCompleted;
+    notifyListeners();
+  }
+
+  // Сортировка задач по приоритету и дедлайну
+  void sortTasks() {
+    _tasks.sort((a, b) {
+      // Сравнение по приоритету
+      if (a.priority == b.priority) {
+        // Если оба дедлайна не null, сравниваем их
+        if (a.deadline != null && b.deadline != null) {
+          return a.deadline!.compareTo(b.deadline!);
+        }
+        // Если у одной задачи нет дедлайна, она считается "позднее"
+        if (a.deadline == null) return 1; // Задачи без дедлайна позже
+        if (b.deadline == null) return -1; // Задачи с дедлайном раньше
+        return 0;
+      }
+      // Сравнение по приоритету
+      return a.priority.index.compareTo(b.priority.index);
+    });
+    notifyListeners();
+  }
+
+  // Метод для завершения всех задач
+  void completeAllTasks() {
+    for (var task in _tasks) {
+      task.isCompleted = true;
+    }
+    notifyListeners();
+  }
+
+  // Асинхронная загрузка задач
+  Future<void> loadTasks() async {
+    if (_tasks.isEmpty) {
+      _tasks = [
+        Task(
+            title: "Task 1",
+            category: "Work",
+            deadline: DateTime.now().add(Duration(days: 1)),
+            priority: TaskPriority.high),
+        Task(
+            title: "Task 2",
+            category: "Home",
+            deadline: DateTime.now().add(Duration(days: 2)),
+            priority: TaskPriority.medium),
+        Task(
+            title: "Task 3",
+            description: "Optional description",
+            priority: TaskPriority.low),
+        Task(
+            title: "Task 4",
+            category: "Personal",
+            priority: TaskPriority.high),
+      ];
+    }
+    notifyListeners();
+  }
+}

pubspec.lock

@@ -75,6 +75,14 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
+  intl:
+    dependency: "direct main"
+    description:
+      name: intl
+      sha256: "910f85bce16fb5c6f614e117efa303e85a1731bb0081edf3604a2ae6e9a3cc91"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.17.0"
   leak_tracker:
     dependency: transitive
     description:
@@ -131,6 +139,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.15.0"
+  nested:
+    dependency: transitive
+    description:
+      name: nested
+      sha256: "03bac4c528c64c95c722ec99280375a6f2fc708eec17c7b3f07253b626cd2a20"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.0"
   path:
     dependency: transitive
     description:
@@ -139,6 +155,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.9.0"
+  provider:
+    dependency: "direct main"
+    description:
+      name: provider
+      sha256: c8a055ee5ce3fd98d6fc872478b03823ffdb448699c6ebdbbc71d59b596fd48c
+      url: "https://pub.dev"
+    source: hosted
+    version: "6.1.2"
   sky_engine:
     dependency: transitive
     description: flutter

pubspec.yaml

@@ -30,6 +30,8 @@ environment:
 dependencies:
   flutter:
     sdk: flutter
+  provider: ^6.0.0
+  intl: ^0.17.0
 
 
   # The following adds the Cupertino Icons font to your application.