packages/flutter_tools/templates/app/lib/main.dart.tmpl - mirrors/flutter - Git at Google

 import 'package:flutter/material.dart';
 {{#withEmptyMain}}

 void main() {
   runApp(const MainApp());
 }

 class MainApp extends StatelessWidget {
   const MainApp({super.key});

   @override
   Widget build(BuildContext context) {
     return const MaterialApp(
       home: Scaffold(
         body: Center(
           child: Text('Hello World!'),
         ),
       ),
     );
   }
 }
 {{/withEmptyMain}}
 {{^withEmptyMain}}
 {{#withPlatformChannelPluginHook}}
 import 'dart:async';

 import 'package:flutter/services.dart';
 import 'package:{{pluginProjectName}}/{{pluginProjectName}}.dart';
 {{/withPlatformChannelPluginHook}}
 {{#withFfi}}
 import 'dart:async';

 import 'package:{{pluginProjectName}}/{{pluginProjectName}}.dart' as {{pluginProjectName}};
 {{/withFfi}}

 void main() {
   runApp(const MyApp());
 }

 {{^withPluginHook}}
 class MyApp extends StatelessWidget {
   const MyApp({super.key});

   // 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 THIS: Try running your application with "flutter run". You'll see
         // the application has a purple toolbar. Then, without quitting the app,
         // try changing the seedColor in the colorScheme below to Colors.green
         // and then invoke "hot reload" (save your changes or press the "hot
         // reload" button in a Flutter-supported IDE, or press "r" if you used
         // the command line to start the app).
         //
         // Notice that the counter didn't reset back to zero; the application
         // state is not lost during the reload. To reset the state, use hot
         // restart instead.
         //
         // This works for code too, not just values: Most code changes can be
         // tested with just a hot reload.
         colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
         useMaterial3: true,
       ),
       home: const MyHomePage(title: 'Flutter Demo Home Page'),
     );
   }
 }

 class MyHomePage extends StatefulWidget {
   const MyHomePage({super.key, required this.title});

   // 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
   State<MyHomePage> 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(
         // TRY THIS: Try changing the color here to a specific color (to
         // Colors.amber, perhaps?) and trigger a hot reload to see the AppBar
         // change color while the other colors stay the same.
         backgroundColor: Theme.of(context).colorScheme.inversePrimary,
         // 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.
           //
           // 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).
           //
           // TRY THIS: Invoke "debug painting" (choose the "Toggle Debug Paint"
           // action in the IDE, or press "p" in the console), to see the
           // wireframe for each widget.
           mainAxisAlignment: MainAxisAlignment.center,
           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),
       ), // This trailing comma makes auto-formatting nicer for build methods.
     );
   }
 }
 {{/withPluginHook}}
 {{#withPlatformChannelPluginHook}}
 class MyApp extends StatefulWidget {
   const MyApp({super.key});

   @override
   State<MyApp> createState() => _MyAppState();
 }

 class _MyAppState extends State<MyApp> {
   String _platformVersion = 'Unknown';
   final _{{pluginClassLowerCamelCase}} = {{pluginDartClass}}();

   @override
   void initState() {
     super.initState();
     initPlatformState();
   }

   // Platform messages are asynchronous, so we initialize in an async method.
   Future<void> initPlatformState() async {
     String platformVersion;
     // Platform messages may fail, so we use a try/catch PlatformException.
     // We also handle the message potentially returning null.
     try {
       platformVersion =
           await _{{pluginClassLowerCamelCase}}.getPlatformVersion() ?? 'Unknown platform version';
     } on PlatformException {
       platformVersion = 'Failed to get platform version.';
     }

     // If the widget was removed from the tree while the asynchronous platform
     // message was in flight, we want to discard the reply rather than calling
     // setState to update our non-existent appearance.
     if (!mounted) return;

     setState(() {
       _platformVersion = platformVersion;
     });
   }

   @override
   Widget build(BuildContext context) {
     return MaterialApp(
       home: Scaffold(
         appBar: AppBar(
           title: const Text('Plugin example app'),
         ),
         body: Center(
           child: Text('Running on: $_platformVersion\n'),
         ),
       ),
     );
   }
 }
 {{/withPlatformChannelPluginHook}}
 {{#withFfi}}
 class MyApp extends StatefulWidget {
   const MyApp({super.key});

   @override
   State<MyApp> createState() => _MyAppState();
 }

 class _MyAppState extends State<MyApp> {
   late int sumResult;
   late Future<int> sumAsyncResult;

   @override
   void initState() {
     super.initState();
     sumResult = {{pluginProjectName}}.sum(1, 2);
     sumAsyncResult = {{pluginProjectName}}.sumAsync(3, 4);
   }

   @override
   Widget build(BuildContext context) {
     const textStyle = TextStyle(fontSize: 25);
     const spacerSmall = SizedBox(height: 10);
     return MaterialApp(
       home: Scaffold(
         appBar: AppBar(
           title: const Text('Native Packages'),
         ),
         body: SingleChildScrollView(
           child: Container(
             padding: const EdgeInsets.all(10),
             child: Column(
               children: [
                 const Text(
                   'This calls a native function through FFI that is shipped as source in the package. '
                   'The native code is built as part of the Flutter Runner build.',
                   style: textStyle,
                   textAlign: TextAlign.center,
                 ),
                 spacerSmall,
                 Text(
                   'sum(1, 2) = $sumResult',
                   style: textStyle,
                   textAlign: TextAlign.center,
                 ),
                 spacerSmall,
                 FutureBuilder<int>(
                   future: sumAsyncResult,
                   builder: (BuildContext context, AsyncSnapshot<int> value) {
                     final displayValue =
                         (value.hasData) ? value.data : 'loading';
                     return Text(
                       'await sumAsync(3, 4) = $displayValue',
                       style: textStyle,
                       textAlign: TextAlign.center,
                     );
                   },
                 ),
               ],
             ),
           ),
         ),
       ),
     );
   }
 }
 {{/withFfi}}
 {{/withEmptyMain}}
	import 'package:flutter/material.dart';
	{{#withEmptyMain}}

	void main() {
	runApp(const MainApp());
	}

	class MainApp extends StatelessWidget {
	const MainApp({super.key});

	@override
	Widget build(BuildContext context) {
	return const MaterialApp(
	home: Scaffold(
	body: Center(
	child: Text('Hello World!'),
	),
	),
	);
	}
	}
	{{/withEmptyMain}}
	{{^withEmptyMain}}
	{{#withPlatformChannelPluginHook}}
	import 'dart:async';

	import 'package:flutter/services.dart';
	import 'package:{{pluginProjectName}}/{{pluginProjectName}}.dart';
	{{/withPlatformChannelPluginHook}}
	{{#withFfi}}
	import 'dart:async';

	import 'package:{{pluginProjectName}}/{{pluginProjectName}}.dart' as {{pluginProjectName}};
	{{/withFfi}}

	void main() {
	runApp(const MyApp());
	}

	{{^withPluginHook}}
	class MyApp extends StatelessWidget {
	const MyApp({super.key});

	// 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 THIS: Try running your application with "flutter run". You'll see
	// the application has a purple toolbar. Then, without quitting the app,
	// try changing the seedColor in the colorScheme below to Colors.green
	// and then invoke "hot reload" (save your changes or press the "hot
	// reload" button in a Flutter-supported IDE, or press "r" if you used
	// the command line to start the app).
	//
	// Notice that the counter didn't reset back to zero; the application
	// state is not lost during the reload. To reset the state, use hot
	// restart instead.
	//
	// This works for code too, not just values: Most code changes can be
	// tested with just a hot reload.
	colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
	useMaterial3: true,
	),
	home: const MyHomePage(title: 'Flutter Demo Home Page'),
	);
	}
	}

	class MyHomePage extends StatefulWidget {
	const MyHomePage({super.key, required this.title});

	// 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
	State<MyHomePage> 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(
	// TRY THIS: Try changing the color here to a specific color (to
	// Colors.amber, perhaps?) and trigger a hot reload to see the AppBar
	// change color while the other colors stay the same.
	backgroundColor: Theme.of(context).colorScheme.inversePrimary,
	// 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.
	//
	// 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).
	//
	// TRY THIS: Invoke "debug painting" (choose the "Toggle Debug Paint"
	// action in the IDE, or press "p" in the console), to see the
	// wireframe for each widget.
	mainAxisAlignment: MainAxisAlignment.center,
	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),
	), // This trailing comma makes auto-formatting nicer for build methods.
	);
	}
	}
	{{/withPluginHook}}
	{{#withPlatformChannelPluginHook}}
	class MyApp extends StatefulWidget {
	const MyApp({super.key});

	@override
	State<MyApp> createState() => _MyAppState();
	}

	class _MyAppState extends State<MyApp> {
	String _platformVersion = 'Unknown';
	final _{{pluginClassLowerCamelCase}} = {{pluginDartClass}}();

	@override
	void initState() {
	super.initState();
	initPlatformState();
	}

	// Platform messages are asynchronous, so we initialize in an async method.
	Future<void> initPlatformState() async {
	String platformVersion;
	// Platform messages may fail, so we use a try/catch PlatformException.
	// We also handle the message potentially returning null.
	try {
	platformVersion =
	await _{{pluginClassLowerCamelCase}}.getPlatformVersion() ?? 'Unknown platform version';
	} on PlatformException {
	platformVersion = 'Failed to get platform version.';
	}

	// If the widget was removed from the tree while the asynchronous platform
	// message was in flight, we want to discard the reply rather than calling
	// setState to update our non-existent appearance.
	if (!mounted) return;

	setState(() {
	_platformVersion = platformVersion;
	});
	}

	@override
	Widget build(BuildContext context) {
	return MaterialApp(
	home: Scaffold(
	appBar: AppBar(
	title: const Text('Plugin example app'),
	),
	body: Center(
	child: Text('Running on: $_platformVersion\n'),
	),
	),
	);
	}
	}
	{{/withPlatformChannelPluginHook}}
	{{#withFfi}}
	class MyApp extends StatefulWidget {
	const MyApp({super.key});

	@override
	State<MyApp> createState() => _MyAppState();
	}

	class _MyAppState extends State<MyApp> {
	late int sumResult;
	late Future<int> sumAsyncResult;

	@override
	void initState() {
	super.initState();
	sumResult = {{pluginProjectName}}.sum(1, 2);
	sumAsyncResult = {{pluginProjectName}}.sumAsync(3, 4);
	}

	@override
	Widget build(BuildContext context) {
	const textStyle = TextStyle(fontSize: 25);
	const spacerSmall = SizedBox(height: 10);
	return MaterialApp(
	home: Scaffold(
	appBar: AppBar(
	title: const Text('Native Packages'),
	),
	body: SingleChildScrollView(
	child: Container(
	padding: const EdgeInsets.all(10),
	child: Column(
	children: [
	const Text(
	'This calls a native function through FFI that is shipped as source in the package. '
	'The native code is built as part of the Flutter Runner build.',
	style: textStyle,
	textAlign: TextAlign.center,
	),
	spacerSmall,
	Text(
	'sum(1, 2) = $sumResult',
	style: textStyle,
	textAlign: TextAlign.center,
	),
	spacerSmall,
	FutureBuilder<int>(
	future: sumAsyncResult,
	builder: (BuildContext context, AsyncSnapshot<int> value) {
	final displayValue =
	(value.hasData) ? value.data : 'loading';
	return Text(
	'await sumAsync(3, 4) = $displayValue',
	style: textStyle,
	textAlign: TextAlign.center,
	);
	},
	),
	],
	),
	),
	),
	),
	);
	}
	}
	{{/withFfi}}
	{{/withEmptyMain}}