Mobiles_programming/lib/main.dart

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import 'package:flutter/material.dart';
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import 'dart:math';
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void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({super.key});
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@override
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Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
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debugShowCheckedModeBanner: false,
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theme: ThemeData(
colorScheme: ColorScheme.fromSeed(seedColor: Colors.cyan),
useMaterial3: true,
),
home: const MyHomePage(title: 'Чернышев Георгий Янович'),
);
}
}
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;
void _incrementCounter() {
setState(() {
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_counter++;
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});
}
@override
Widget build(BuildContext context) {
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return Scaffold(
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appBar: AppBar(
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backgroundColor: Theme.of(context).colorScheme.inversePrimary,
title: Text(widget.title),
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),
body: Center(
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child: Column(
mainAxisAlignment: MainAxisAlignment.center,
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children: <Widget>[
const Text(
'You have pushed the button this many times:',
),
Text(
'$_counter',
style: Theme.of(context).textTheme.headlineMedium,
),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: _incrementCounter,
tooltip: 'Increment',
child: const Icon(Icons.add),
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),
);
}
}
class Game extends Object {
final String name;
final int price;
final GameType type; //жанр игры
final String? description;
@override
bool operator ==(Object other) {
if (other is Game) {
return this.name == other.name;
}
return false;
}
//стандартный конструктор с именованными параметрами
Game(
{required this.name,
required this.price,
required this.type,
this.description});
//именованный конструктор с примером игры
Game.exampleLateShift()
: name = 'Late Shift',
price = 200,
type = GameType.FMV,
description = null;
void printInfo() {
print('''
Игра: $name
Жанр: ${GameTypeNames[type]}
Цена: $price руб. ''');
if (description != null) {
print('Описание: $description');
}
}
//асинхронный метод - иммитация скачивания
Future<void> download() async {
print('Начало загрузки игры $name');
var rand = Random();
int time = rand.nextInt(10000) + 100;
//асинхронность (Future), анонимная функция (Anonymous function)
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await Future.delayed(
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Duration(milliseconds: time), () => print("Игра $name загружена"));
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}
}
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enum GameType { FMV, Shooter, Strategy, Horror }
//Названия жанров на русском
const Map<GameType, String> GameTypeNames = {
GameType.FMV: "FMV",
GameType.Shooter: "Шутер",
GameType.Strategy: "Стратегия",
GameType.Horror: "Хоррор"
};
void availableTypesRus() => printMapValues(GameTypeNames);
//цикл (loop) + generic (хз, куда ещё их можно)
void printMapValues<T, U>(Map<T, U> map) {
for (var val in map.values) {
print(val);
}
}
extension GameTypeRus on GameType {
String get rusName {
switch(this) {
case GameType.FMV:
return 'FMV';
case GameType.Shooter:
return 'Шутер';
case GameType.Strategy:
return 'Стратегия';
case GameType.Horror:
return 'Хоррор';
}
}
}