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-rw-r--r--lib/main.dart113
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+import 'package:flutter/material.dart';
+
+void main() {
+ runApp(MyApp());
+}
+
+class MyApp extends StatelessWidget {
+ // This widget is the root of your application.
+ @override
+ Widget build(BuildContext context) {
+ return MaterialApp(
+ title: 'Flutter Demo',
+ theme: ThemeData(
+ // This is the theme of your application.
+ //
+ // Try running your application with "flutter run". You'll see the
+ // application has a blue toolbar. Then, without quitting the app, try
+ // changing the primarySwatch below to Colors.green and then invoke
+ // "hot reload" (press "r" in the console where you ran "flutter run",
+ // or simply save your changes to "hot reload" in a Flutter IDE).
+ // Notice that the counter didn't reset back to zero; the application
+ // is not restarted.
+ primarySwatch: Colors.blue,
+ ),
+ home: MyHomePage(title: 'Flutter Demo Home Page'),
+ );
+ }
+}
+
+class MyHomePage extends StatefulWidget {
+ MyHomePage({Key? key, required this.title}) : super(key: key);
+
+ // This widget is the home page of your application. It is stateful, meaning
+ // that it has a State object (defined below) that contains fields that affect
+ // how it looks.
+
+ // This class is the configuration for the state. It holds the values (in this
+ // case the title) provided by the parent (in this case the App widget) and
+ // used by the build method of the State. Fields in a Widget subclass are
+ // always marked "final".
+
+ final String title;
+
+ @override
+ _MyHomePageState createState() => _MyHomePageState();
+}
+
+class _MyHomePageState extends State<MyHomePage> {
+ int _counter = 0;
+
+ void _incrementCounter() {
+ setState(() {
+ // This call to setState tells the Flutter framework that something has
+ // changed in this State, which causes it to rerun the build method below
+ // so that the display can reflect the updated values. If we changed
+ // _counter without calling setState(), then the build method would not be
+ // called again, and so nothing would appear to happen.
+ _counter++;
+ });
+ }
+
+ @override
+ Widget build(BuildContext context) {
+ // This method is rerun every time setState is called, for instance as done
+ // by the _incrementCounter method above.
+ //
+ // The Flutter framework has been optimized to make rerunning build methods
+ // fast, so that you can just rebuild anything that needs updating rather
+ // than having to individually change instances of widgets.
+ return Scaffold(
+ appBar: AppBar(
+ // Here we take the value from the MyHomePage object that was created by
+ // the App.build method, and use it to set our appbar title.
+ title: Text(widget.title),
+ ),
+ body: Center(
+ // Center is a layout widget. It takes a single child and positions it
+ // in the middle of the parent.
+ child: Column(
+ // Column is also a layout widget. It takes a list of children and
+ // arranges them vertically. By default, it sizes itself to fit its
+ // children horizontally, and tries to be as tall as its parent.
+ //
+ // Invoke "debug painting" (press "p" in the console, choose the
+ // "Toggle Debug Paint" action from the Flutter Inspector in Android
+ // Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
+ // to see the wireframe for each widget.
+ //
+ // Column has various properties to control how it sizes itself and
+ // how it positions its children. Here we use mainAxisAlignment to
+ // center the children vertically; the main axis here is the vertical
+ // axis because Columns are vertical (the cross axis would be
+ // horizontal).
+ mainAxisAlignment: MainAxisAlignment.center,
+ children: <Widget>[
+ Text(
+ 'You have pushed the button this many times:',
+ ),
+ Text(
+ '$_counter',
+ style: Theme.of(context).textTheme.headline4,
+ ),
+ ],
+ ),
+ ),
+ floatingActionButton: FloatingActionButton(
+ onPressed: _incrementCounter,
+ tooltip: 'Increment',
+ child: Icon(Icons.add),
+ ), // This trailing comma makes auto-formatting nicer for build methods.
+ );
+ }
+}