Created
July 3, 2021 16:30
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| import 'package:flutter/material.dart'; | |
| void main() { | |
| runApp(MyApp()); | |
| } | |
| class MyApp extends StatelessWidget { | |
| @override | |
| Widget build(BuildContext context) { | |
| return MaterialApp( | |
| title: 'Flutter Demo', | |
| theme: ThemeData( | |
| primarySwatch: Colors.blue, | |
| ), | |
| home: MyHomePage(title: 'Flutter Demo Home Page'), | |
| ); | |
| } | |
| } | |
| class MyHomePage extends StatefulWidget { | |
| MyHomePage({Key? key, required this.title}) : super(key: key); | |
| final String title; | |
| @override | |
| _MyHomePageState createState() => _MyHomePageState(); | |
| } | |
| class _MyHomePageState extends State<MyHomePage> { | |
| int _counter = 0; | |
| void _incrementCounter() { | |
| setState(() { | |
| _counter++; | |
| }); | |
| } | |
| @override | |
| Widget build(BuildContext context) { | |
| print('MyHomePage is rebuilt with $_counter'); | |
| return Scaffold( | |
| appBar: AppBar( | |
| title: Text(widget.title), | |
| ), | |
| body: Center( | |
| child: Column( | |
| mainAxisAlignment: MainAxisAlignment.center, | |
| children: <Widget>[ | |
| FixedTextWidget(), | |
| CountDisplayWidget(counter: _counter), | |
| ], | |
| ), | |
| ), | |
| floatingActionButton: FloatingActionButton( | |
| onPressed: _incrementCounter, | |
| tooltip: 'Increment', | |
| child: Icon(Icons.add), | |
| ), | |
| ); | |
| } | |
| } | |
| class FixedTextWidget extends StatelessWidget { | |
| const FixedTextWidget({ | |
| Key? key, | |
| }) : super(key: key); | |
| @override | |
| Widget build(BuildContext context) { | |
| print('FixedText is rebuilt'); | |
| return Text( | |
| 'You have pushed the button this many times:', | |
| ); | |
| } | |
| } | |
| class CountDisplayWidget extends StatelessWidget { | |
| const CountDisplayWidget({ | |
| Key? key, | |
| required int counter, | |
| }) : _counter = counter, super(key: key); | |
| final int _counter; | |
| @override | |
| Widget build(BuildContext context) { | |
| print('CountDisplay is rebuilt with $_counter'); | |
| return Text( | |
| '$_counter', | |
| style: Theme.of(context).textTheme.headline4, | |
| ); | |
| } | |
| } |
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