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July 13, 2023 10:22
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| // Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file | |
| // for details. All rights reserved. Use of this source code is governed by a | |
| // BSD-style license that can be found in the LICENSE file. | |
| import 'package:flutter/material.dart'; | |
| void main() => runApp(MyApp()); | |
| class MyApp extends StatelessWidget { | |
| @override | |
| Widget build(BuildContext context) { | |
| return MaterialApp( | |
| title: 'Flutter Demo', | |
| debugShowCheckedModeBanner: false, | |
| theme: ThemeData( | |
| primarySwatch: Colors.blue, | |
| ), | |
| home: const MyHomePage(title: 'Flutter Demo Home Page'), | |
| ); | |
| } | |
| } | |
| class MyHomePage extends StatefulWidget { | |
| final String title; | |
| const MyHomePage({ | |
| Key? key, | |
| required this.title, | |
| }) : super(key: key); | |
| @override | |
| State<MyHomePage> createState() => _MyHomePageState(); | |
| } | |
| class _MyHomePageState extends State<MyHomePage> { | |
| int _counter = 0; | |
| void _incrementCounter(int value) { | |
| setState(() { | |
| _counter = value; | |
| }); | |
| } | |
| void _isEven() { | |
| final isEven = _counter % 2 == 0 ? "Evennnn" : "that's odddd"; | |
| print(isEven); | |
| } | |
| @override | |
| Widget build(BuildContext context) { | |
| return Scaffold( | |
| appBar: AppBar( | |
| title: Text(widget.title), | |
| ), | |
| body: CounterDisplay(count: _counter, onIncrement: _incrementCounter), | |
| floatingActionButton: FloatingActionButton( | |
| onPressed: _isEven, | |
| tooltip: 'Increment', | |
| child: const Icon(Icons.add), | |
| ), | |
| ); | |
| } | |
| } | |
| class CounterDisplay extends StatelessWidget { | |
| const CounterDisplay({required this.count, required this.onIncrement}); | |
| final int count; | |
| final ValueSetter<int> onIncrement; | |
| @override | |
| Widget build(BuildContext context) { | |
| return Center( | |
| child: Column( | |
| mainAxisAlignment: MainAxisAlignment.center, | |
| children: [ | |
| const Text( | |
| 'You have pushed the button this many times:', | |
| ), | |
| Text( | |
| '$count', | |
| style: Theme.of(context).textTheme.headlineMedium, | |
| ), | |
| TextButton(child: Text("Increment"), onPressed: () => onIncrement(count + 16)) | |
| ], | |
| ), | |
| ); | |
| } | |
| } |
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