лабораторная 2 пажаласта!

lib/FinanceManager.dart

@@ -0,0 +1,24 @@
+import 'Transaction.dart';
+
+// Класс для управления списком транзакций
+class FinanceManager {
+  final List<Transaction> _transactions = [];
+
+  void addTransaction(Transaction transaction) {
+    _transactions.add(transaction);
+  }
+
+  List<Transaction> filterTransactionsByCategory(TransactionCategory category) {
+    return _transactions.where((transaction) => transaction.category == category).toList();
+  }
+
+  double calculateTotalAmount() {
+    return _transactions.fold(0.0, (sum, transaction) => sum + transaction.amount);
+  }
+
+  Future<void> clearTransactions() async {
+    await Future.delayed(Duration(seconds: 2)); // Имитация задержки
+    _transactions.clear();
+    print('Список успешно очищен');
+  }
+}

lib/Transaction.dart

@@ -0,0 +1,17 @@
+import 'dart:async';
+import 'main.dart';
+
+enum TransactionCategory {
+  food,
+  transport,
+  entertainment,
+  other,
+}
+
+class Transaction {
+  final String description;
+  final double amount;
+  final TransactionCategory category;
+
+  Transaction(this.description, this.amount, this.category);
+}

lib/main.dart

@@ -1,7 +1,11 @@
 import 'dart:math';
+import 'package:app/FinanceManager.dart';
 
+import 'Transaction.dart';
 import 'package:flutter/material.dart';
 
+import 'dart:async';
+
 void main() {
   runApp(const MyApp());
 }
@@ -13,11 +17,12 @@ class MyApp extends StatelessWidget {
   Widget build(BuildContext context) {
     return MaterialApp(
       title: 'Flutter Demo',
+      debugShowCheckedModeBanner: false,
       theme: ThemeData(
         colorScheme: ColorScheme.fromSeed(seedColor: Colors.teal),
         useMaterial3: true,
       ),
-      home: const MyHomePage(title: 'Flutter rocks!'),
+      home: const MyHomePage(title: 'Пучкина Анна Алексеевна'),
     );
   }
 }
@@ -31,13 +36,30 @@ class MyHomePage extends StatefulWidget {
   State<MyHomePage> createState() => _MyHomePageState();
 }
 
+// Расширение для класса Transaction
+extension TransactionExtensions on Transaction {
+  String get formattedAmount => '${amount.toStringAsFixed(2)}';
+}
+
 class _MyHomePageState extends State<MyHomePage> {
-  int _counter = 0;
   Color _color = Colors.teal;
 
-  void _incrementCounter() {
+  final FinanceManager _financeManager = FinanceManager();
+  bool _isClearing = false;
+
+  int counter = 1;
+
+  void _addRandomTransaction() {
+    final random = Random();
+    final description = 'Транзакция $counter';
+    final amount = random.nextDouble() * 1000;
+    final category = TransactionCategory.values[random.nextInt(TransactionCategory.values.length)];
+
+    final transaction = Transaction(description, amount, category);
+    _financeManager.addTransaction(transaction);
+    counter++;
+
     setState(() {
-      _counter++;
       _color = Color((Random().nextDouble() * 0xFFFFFF).toInt()).withOpacity(1.0);
     });
   }
@@ -53,26 +75,79 @@ class _MyHomePageState extends State<MyHomePage> {
         child: Column(
           mainAxisAlignment: MainAxisAlignment.center,
           children: <Widget>[
-            const Text(
-              'You have pushed the button this many times:',
-            ),
             Text(
-              '$_counter',
-              style: Theme.of(context).textTheme.headlineMedium,
+              'Учет расходов',
+              style: TextStyle(fontSize: 24, fontWeight: FontWeight.bold),
             ),
-            if (_counter > 10)
-              Text(
-                'Че кликаем?!',
-                style: Theme.of(context).textTheme.headlineMedium,
-              )
-          ],
+            SizedBox(height: 10),
+            Text(
+              'Итоговая сумма: ${_financeManager.calculateTotalAmount().toStringAsFixed(2)}',
+              style: TextStyle(fontSize: 20, fontWeight: FontWeight.bold),
+            ),
+            SizedBox(height: 20),
+            Expanded(
+              child: SingleChildScrollView(
+                child: Column(
+                  children: <Widget>[
+                    for (var category in TransactionCategory.values)
+                      Column(
+                        crossAxisAlignment: CrossAxisAlignment.start,
+                        children: [
+                          Text(
+                            'Категория: ${category.name}',
+                            style: TextStyle(fontSize: 18, fontWeight: FontWeight.bold),
+                          ),
+                          for (var transaction in _financeManager.filterTransactionsByCategory(category))
+                            Text(
+                              '${transaction.description} - Сумма: ${transaction.formattedAmount}',
+                              style: const TextStyle(fontSize: 18),
+                            ),
+                          SizedBox(height: 10),
+                        ],
+                      ),
+                    if (_isClearing)
+                      Padding(
+                        padding: const EdgeInsets.all(16.0),
+                        child: Text(
+                          'Очищение списка...',
+                          style: TextStyle(fontSize: 18, color: Colors.red),
+                        ),
+                      ),
+                  ],
+
+                ),
+
+              ),
+            ),
+        ],
         ),
       ),
-      floatingActionButton: FloatingActionButton(
-        onPressed: _incrementCounter,
-        backgroundColor: _color,
-        tooltip: 'Increment',
-        child: const Icon(Icons.accessible_forward_sharp),
-      ),     );
+      floatingActionButton: Row(
+        mainAxisAlignment: MainAxisAlignment.end,
+        children: [
+          FloatingActionButton(
+            onPressed: () async {
+              _addRandomTransaction();
+            },
+            backgroundColor: _color,
+            child: const Icon(Icons.add),
+          ),
+          SizedBox(width: 10),
+          FloatingActionButton(
+            onPressed: () async {
+              setState(() {
+                _isClearing = true;
+              });
+              await _financeManager.clearTransactions();
+              setState(() {
+                _isClearing = false;
+              });
+            },
+            backgroundColor: Colors.red,
+            child: const Icon(Icons.clear),
+          ),
+        ],
+      ),
+    );
   }
 }