From cd2e5caed9b008d9b804d03d4ee29080a1076e1f Mon Sep 17 00:00:00 2001 From: Jeff Carr Date: Fri, 16 Dec 2022 05:14:50 -0600 Subject: [PATCH] first commit of the flutter demo Signed-off-by: Jeff Carr --- lib/main.dart | 109 +++++--------------------------------------------- 1 file changed, 11 insertions(+), 98 deletions(-) diff --git a/lib/main.dart b/lib/main.dart index e016029..716b45c 100644 --- a/lib/main.dart +++ b/lib/main.dart @@ -1,3 +1,7 @@ +// Copyright 2018 The Flutter team. 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() { @@ -7,109 +11,18 @@ void main() { 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 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: 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 createState() => _MyHomePageState(); -} - -class _MyHomePageState extends State { - 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: [ - const Text( - 'You have pushed the button this many times:', - ), - Text( - '$_counter', - style: Theme.of(context).textTheme.headline4, - ), - ], + title: 'Welcome to Flutter', + home: Scaffold( + appBar: AppBar( + title: const Text('Welcome to Flutter'), + ), + body: const Center( + child: Text('Hello World'), ), ), - floatingActionButton: FloatingActionButton( - onPressed: _incrementCounter, - tooltip: 'Increment', - child: const Icon(Icons.add), - ), // This trailing comma makes auto-formatting nicer for build methods. ); } }