first 3 labs done

lib/StockCategory.dart

@@ -0,0 +1,19 @@
+
+enum StockCategory {
+  oilgas,
+  mining,
+  finance
+}
+
+extension StockCategoryExtension on StockCategory {
+  String get name {
+    switch (this) {
+      case StockCategory.oilgas:
+        return 'Нефтегазовая отрасль';
+      case StockCategory.mining:
+        return 'Добыча полезных ископаемых';
+      case StockCategory.finance:
+        return 'Банки';
+    }
+  }
+}

lib/main.dart

@@ -1,13 +1,6 @@
-import 'dart:math';
 import 'package:flutter/material.dart';
-// Classes +
-// Methods +
-// Enums +
-// Loops +
-// Generics (List<>) +
-// Anonymous functions +
-// Future +
-// Extension +
+import 'package:fl_chart/fl_chart.dart';
+import 'StockCategory.dart';
 
 void main() {
   runApp(const MyApp());
@@ -24,13 +17,14 @@ class MyApp extends StatelessWidget {
         colorScheme: ColorScheme.fromSeed(seedColor: Colors.red),
         useMaterial3: true,
       ),
-      home: const MyHomePage(title: 'Gerimovich I M'),
+      home: const MyHomePage(title: 'Gerimovich Ilya Maximovich'),
     );
   }
 }
 
 class MyHomePage extends StatefulWidget {
   const MyHomePage({super.key, required this.title});
+
   final String title;
 
   @override
@@ -55,39 +49,39 @@ class _MyHomePageState extends State<MyHomePage> {
   }
 }
 
-enum StockCategory { oilgas, finance, mining }
-extension StockCategoryExtension on StockCategory {
-  String get name {
-    switch (this) {
-      case StockCategory.oilgas:
-        return 'Нефтегазовая отрасль';
-      case StockCategory.finance:
-        return 'Банки';
-      case StockCategory.mining:
-        return 'Добыча полезных ископаемых';
-    }
-  }
-}
-
 class Stock {
-  final String name;
-  final double price;
-  final String imageUrl;
-  final StockCategory category;
+  final String? name;
+  final double? price;
+  final String? imageUrl;
+  final StockCategory? category;
 
   Stock({
-    required this.name,
-    required this.price,
-    required this.imageUrl,
-    required this.category,
+    this.name, this.price, this.imageUrl, this.category,
   });
 }
 
-class StocksWidget extends StatelessWidget {
+class StocksWidget extends StatefulWidget {
   const StocksWidget({super.key});
+
+  @override
+  State<StocksWidget> createState() => _StocksWidgetState();
+}
+
+class _StocksWidgetState extends State<StocksWidget> {
+  final List<double> prices = [52.90, 77, 89, 111, 135.43, 157.50, 111.11];
+
+  Future<void> _fetchNewPrice() async {
+    await Future.delayed(const Duration(seconds: 1));
+    setState(() {
+      prices.add(prices.last + (prices.last * 0.1));
+      //if (prices.length > 5) {
+      //  prices.removeAt(0);
+      //}
+    });
+  }
+
   @override
   Widget build(BuildContext context) {
-
     final stocks = [
       Stock(
           name: 'Алроса',
@@ -97,21 +91,15 @@ class StocksWidget extends StatelessWidget {
           category: StockCategory.mining),
       Stock(
           name: 'Газпром',
-          price: 135.43,
+          price: 135.431111,
           imageUrl: 'https://data.cbonds.info/organisations_logos/21/21.png',
           category: StockCategory.oilgas),
       Stock(
           name: 'Сбербанк',
-          price: 257.50,
-          imageUrl:
-          'https://data.cbonds.info/organisations_logos/313/1615279834sberbank__2-01.png',
-          category: StockCategory.finance),
-      Stock(
-          name: 'Сбербанк',
-          price: 111111111.111111111,
           imageUrl:
           'https://data.cbonds.info/organisations_logos/313/1615279834sberbank__2-01.png',
           category: StockCategory.finance),
+      Stock(),
     ];
 
     return Center(
@@ -120,6 +108,32 @@ class StocksWidget extends StatelessWidget {
           mainAxisAlignment: MainAxisAlignment.center,
           children: [
             ...stocks.map((e) => StockCard(stock: e)),
+            const SizedBox(height: 20),
+            ElevatedButton(
+              onPressed: _fetchNewPrice,
+              child: const Text('Добавить новую цену'),
+            ),
+            const SizedBox(height: 20),
+            SizedBox(
+              height: 300,
+              child: LineChart(
+                LineChartData(
+                  lineBarsData: [
+                    LineChartBarData(
+                      spots: prices
+                          .asMap()
+                          .map((index, price) => MapEntry(index.toDouble(), FlSpot(index.toDouble(), price)))
+                          .values
+                          .toList(),
+                      isCurved: true,
+                      color: Colors.blue,
+                      barWidth: 3,
+                      dotData: const FlDotData(show: false),
+                    ),
+                  ],
+                ),
+              ),
+            ),
           ],
         ),
       ),
@@ -129,35 +143,36 @@ class StocksWidget extends StatelessWidget {
 
 class StockCard extends StatelessWidget {
   final Stock stock;
+
   const StockCard({super.key, required this.stock});
 
   @override
   Widget build(BuildContext context) {
     return Card(
-      margin: const EdgeInsets.all(8.0),
+      margin: const EdgeInsets.all(8.5),
       child: Padding(
-        padding: const EdgeInsets.all(14.0),
+        padding: const EdgeInsets.all(20),
         child: Row(
           children: [
             Image.network(
-              stock.imageUrl,
+              stock.imageUrl ?? 'https://img.freepik.com/premium-vector/vector-illustration-about-concept-of-no-result-data-or-document-or-file-not-found_675567-5734.jpg',
               width: 85,
               height: 85,
             ),
-            const SizedBox(width: 16.0),
+            const SizedBox(width: 20),
             Column(
               crossAxisAlignment: CrossAxisAlignment.start,
               children: [
                 Text(
-                  stock.name,
+                  stock.name ?? '',
                   style: Theme.of(context).textTheme.headlineSmall,
                 ),
                 Text(
-                  '${stock.price.toStringAsFixed(2)} р',
+                  '${stock.price?.toStringAsFixed(2)} р',
                   style: Theme.of(context).textTheme.bodyLarge,
                 ),
                 Text(
-                  stock.category.name,
+                  stock.category?.name ?? '',
                   style: Theme.of(context).textTheme.bodySmall,
                 ),
               ],

pubspec.lock

@@ -49,6 +49,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.0.8"
+  equatable:
+    dependency: transitive
+    description:
+      name: equatable
+      sha256: c2b87cb7756efdf69892005af546c56c0b5037f54d2a88269b4f347a505e3ca2
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.0.5"
   fake_async:
     dependency: transitive
     description:
@@ -57,6 +65,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.3.1"
+  fl_chart:
+    dependency: "direct main"
+    description:
+      name: fl_chart
+      sha256: "94307bef3a324a0d329d3ab77b2f0c6e5ed739185ffc029ed28c0f9b019ea7ef"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.69.0"
   flutter:
     dependency: "direct main"
     description: flutter

pubspec.yaml

@@ -31,7 +31,7 @@ dependencies:
   flutter:
     sdk: flutter
 
-
+  fl_chart: ^0.69.0
   # The following adds the Cupertino Icons font to your application.
   # Use with the CupertinoIcons class for iOS style icons.
   cupertino_icons: ^1.0.8