Flutter/helloworld - 変更履歴

Admin: /* helloworldサンプル2 */

2019-04-19T02:41:59Z

‎helloworldサンプル2

Admin: /* helloworldサンプル */

2019-04-19T02:41:45Z

‎helloworldサンプル

2019年4月18日 (木) 09:10にAdminによる

2019-04-18T09:10:55Z

2019年4月18日 (木) 06:44にAdminによる

2019-04-18T06:44:49Z

Admin: ページの作成:「==カウントアップしていくhelloworldサンプル== lib/main.dart

 import 'package:flutter/material.dart';  void main() => runApp(MyApp());  class MyApp exte...」

2019-04-18T06:00:52Z

ページの作成:「==カウントアップしていくhelloworldサンプル== lib/main.dart <pre> import 'package:flutter/material.dart'; void main() => runApp(MyApp()); class MyApp exte...」

新規ページ

==カウントアップしていくhelloworldサンプル==
lib/main.dart
<pre>
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, 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 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(
'HelloWorld:',
),
Text(
'$_counter',
style: Theme.of(context).textTheme.display1,
),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: _incrementCounter,
tooltip: 'Increment',
child: Icon(Icons.add),
), // This trailing comma makes auto-formatting nicer for build methods.
);
}
}

</pre>

@@ 行9: / 行9: @@
 ==helloworldサンプル2==
 lib/main.dart
 <pre>
 import 'package:flutter/material.dart';
 void main() => runApp(new MyApp());

@@ 行6: / 行6: @@
 import 'package:flutter/widgets.dart';
 void main() => runApp(const Center(child: Text('Hello, world!', textDirection: TextDirection.ltr)));
 </pre>

@@ 行1: / 行1: @@
-==プロジェクト作成==
+==helloworldサンプル==
   flutter create my_app
   cd my_app
   flutter run
 lib/main.dart
 <pre>

←前の版		2019年4月18日 (木) 06:44時点における版
行1:		行1:
		+	==プロジェクト作成==
		+	flutter create my_app
		+	cd my_app
		+	flutter run
		+
	==カウントアップしていくhelloworldサンプル==		==カウントアップしていくhelloworldサンプル==
	lib/main.dart		lib/main.dart