lib/VideoCards.dart

@@ -0,0 +1,18 @@
+import 'dart:async';
+import 'main.dart';
+
+enum VideoCardsCategory {
+  Nvidia,
+  Asus,
+  Msi,
+  AMD,
+  Palit,
+}
+
+class VideoCards{
+  final String videomemory;
+  final double price;
+  final VideoCardsCategory category;
+
+  VideoCards(this.videomemory, this.price, this.category);
+}

lib/VideoCardsManager.dart

@@ -0,0 +1,23 @@
+import 'VideoCards.dart';
+
+class VideoCardsManager {
+  final List<VideoCards> _videocards = [];
+
+  void addVideoCards(VideoCards videocards) {
+    _videocards.add(videocards);
+  }
+
+  List<VideoCards> filterVideoCardsByCategory(VideoCardsCategory category) {
+    return _videocards.where((videocards) => videocards.category == category).toList();
+  }
+
+  double calculateTotalAmount() {
+    return _videocards.fold(0.0, (sum,videocards) => sum + videocards.price);
+  }
+
+  Future<void> clearVideoCards() async {
+    await Future.delayed(Duration(seconds: 3));
+    _videocards.clear();
+    print('Список чист!');
+  }
+}

lib/main.dart

@@ -1,3 +1,7 @@
+import 'dart:math';
+import 'dart:async';
+import 'VideoCards.dart';
+import 'VideoCardsManager.dart';
 import 'package:flutter/material.dart';
 
 void main() {
@@ -8,63 +12,145 @@ class MyApp extends StatelessWidget {
   const MyApp({super.key});
 
     @override
-  Widget build(BuildContext context) {
-    return MaterialApp(
-      title: 'Flutter Demo',
-      theme: ThemeData(
-        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
-        useMaterial3: true,
-      ),
-      home: const MyHomePage(title: 'Batsylev Vladislav Alexeyevich'),
-    );
+    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: 'Бацылев Владислав Алексеевич'),
+      );
+    }
   }
-}
 
 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;
+extension VideoCardsExtensions on VideoCards {
+  String get formattedPrice => '${price.toStringAsFixed(2)}';
+}
+
+class _MyHomePageState extends State<MyHomePage> {
+   Color _color = Colors.grey;
+  final VideoCardsManager _videoCardsManager = VideoCardsManager();
+  bool _isClearing = false;
+
+  int counter = 2;
+
+  void _addRandomVideocards() {
+    final random = Random();
+    final videomemory = '$counter Gb';
+    final price = random.nextDouble() * 15000;
+    final category = VideoCardsCategory.values[random.nextInt(
+        VideoCardsCategory.values.length)];
+
+    final videocards = VideoCards(videomemory, price, category);
+    _videoCardsManager.addVideoCards(videocards);
+    counter = counter + 2;
 
-  void _incrementCounter() {
     setState(() {
-                                    _counter++;
+      switch (category) {
+        case VideoCardsCategory.Nvidia:
+          _color = Colors.green;
+        case VideoCardsCategory.Asus:
+          _color = Colors.blue;
+        case VideoCardsCategory.Msi:
+          _color = Colors.red;
+        case VideoCardsCategory.AMD:
+          _color = Colors.redAccent;
+        case VideoCardsCategory.Palit:
+          _color = Colors.brown;
+      }
     });
   }
 
   @override
   Widget build(BuildContext context) {
-                            return Scaffold(
+    return Scaffold(
       appBar: AppBar(
-                                backgroundColor: Theme.of(context).colorScheme.inversePrimary,
-                        title: Text(widget.title),
+        backgroundColor: _color,
+        title: Text(widget.title),
       ),
       body: Center(
-                        child: Column(
-                                                                                                                                            mainAxisAlignment: MainAxisAlignment.center,
-          children: <Widget>[
-            const Text(
-              'You have pushed the button this many times:',
+        child: Column(
+            mainAxisAlignment: MainAxisAlignment.center,
+            children: <Widget>[
+              const Text(
+                'Характеристики Видеокарт',
+                style: TextStyle(fontSize: 24, fontWeight: FontWeight.bold),
+              ),
+            SizedBox (height: 20),
+            Expanded(
+              child: SingleChildScrollView(
+                child: Column(
+                  children: <Widget>[
+                    for (var category in VideoCardsCategory.values)
+                      Column(
+                        crossAxisAlignment: CrossAxisAlignment.start,
+                        children: [
+                          Text(
+                            'Видеокарты: ${category.name}',
+                            style: TextStyle(fontSize: 18, fontWeight: FontWeight.bold),
+                          ),
+                          for (var videocards in _videoCardsManager.filterVideoCardsByCategory(category))
+                            Text(
+                              '${videocards.videomemory} - Цена: ${videocards.formattedPrice} рублей.',
+                              style: const TextStyle(fontSize: 18),
+                            ),
+                          SizedBox(height: 10),
+                        ],
+                      ),
+                    if (_isClearing)
+                      const Padding(
+                        padding: const EdgeInsets.all(16.0),
+                          child: Text(
+                            'Очищение списка...',
+                            style: TextStyle(fontSize: 18, color: Colors.blueGrey),
+                          ),
+                      ),
+                  ],
+
+                ),
+
+              ),
             ),
-            Text(
-              '$_counter',
-              style: Theme.of(context).textTheme.headlineMedium,
-            ),
-          ],
+            ],
         ),
       ),
-      floatingActionButton: FloatingActionButton(
-        onPressed: _incrementCounter,
-        tooltip: 'Increment',
-        child: const Icon(Icons.add),
-      ),     );
+      floatingActionButton: Row(
+        mainAxisAlignment: MainAxisAlignment.end,
+        children: [
+          FloatingActionButton(
+            onPressed: () async {
+              _addRandomVideocards();
+            },
+            backgroundColor: _color,
+            child: const Icon(Icons.add),
+          ),
+          SizedBox(width: 10),
+          FloatingActionButton(
+            onPressed: () async {
+              setState(() {
+                _isClearing = true;
+              });
+              await _videoCardsManager.clearVideoCards();
+              setState(() {
+                _isClearing = false;
+              });
+            },
+            backgroundColor: Colors.red,
+            child: const Icon(Icons.clear),
+          ),
+        ],
+      ),
+    );
   }
-}
+}