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‎projects/lib/main2.dart

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import 'package:flutter/material.dart';
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void main() => runApp(new MyApp());
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class MyApp extends StatelessWidget {
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// This widget is the root of your application.
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@override
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Widget build(BuildContext context) {
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return new MaterialApp(
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title: 'Flutter Demo',
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theme: new ThemeData(
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primarySwatch: Colors.blue,
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),
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home: new MyHomePage(title: 'Flutter Demo Home Page'),
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);
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}
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}
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class MyHomePage extends StatefulWidget {
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final String title;
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MyHomePage({Key key, this.title}) : super(key: key);
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@override
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_MyHomePageState createState() => new _MyHomePageState();
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}
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class _MyHomePageState extends State<MyHomePage> {
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int _counter = 0;
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void _incrementCounter() {
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setState(() {
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_counter++;
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});
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}
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@override
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Widget build(BuildContext context) {
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return new Scaffold(
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appBar: new AppBar(
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title: new Text(widget.title),
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),
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body: new Center(
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child: new Column(
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mainAxisAlignment: MainAxisAlignment.center,
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children: <Widget>[
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new Text(
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'You have pushed the button this many times:',
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),
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new Text(
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'$_counter',
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style: Theme.of(context).textTheme.display1,
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),
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],
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),
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),
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floatingActionButton: new FloatingActionButton(
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onPressed: _incrementCounter,
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tooltip: 'Increment',
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child: new Icon(Icons.add),
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),
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);
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}
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}

‎projects/lib/mysample/action/page4.dart

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import 'package:flutter/material.dart';
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/// 交互
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void main() {
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runApp(new MaterialApp(
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title: '交互',
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home: new Counter(),
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));
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}
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class Counter extends StatefulWidget {
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@override
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_CounterState createState() => new _CounterState();
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}
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class _CounterState extends State<Counter> {
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int _count = 0; //计数
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void _increment() {
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setState(() {
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_count += 1;
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});
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}
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@override
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Widget build(BuildContext context) {
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return new Scaffold(
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appBar: new AppBar(
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title: new Text('交互'),
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),
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body: new Center(
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child: new Text('按钮点击 $_count 次}'),
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),
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floatingActionButton: new FloatingActionButton(
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onPressed: _increment,
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tooltip: '增加',
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child: new Icon(Icons.add),
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),
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);
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}
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}

‎projects/lib/mysample/action/page4_review.dart

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import 'package:flutter/material.dart';
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void main() {
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runApp(new MaterialApp(
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title: '交互',
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home: new Counter(),
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));
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}
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class Counter extends StatefulWidget {
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@override
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_CounterState createState() => new _CounterState();
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}
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class _CounterState extends State<Counter> {
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int _count = 0; //计数
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void _increment() {
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setState(() {
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_count += 1;
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});
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}
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@override
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Widget build(BuildContext context) {
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return new Scaffold(
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appBar: new AppBar(
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title: new Text('交互'),
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),
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body: new CounterDiaplay(count: _count),
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floatingActionButton: new CounterIncrementer(
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onPressed: _increment,
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),
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);
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}
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}
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// 简单的封装 计数显示
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class CounterDiaplay extends StatelessWidget {
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CounterDiaplay({this.count});
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final int count;
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@override
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Widget build(BuildContext context) {
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return new Center(
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child: new Text('按钮点击 $count 次}'),
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);
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}
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}
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// 简单的封装 计数改变
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class CounterIncrementer extends StatelessWidget {
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CounterIncrementer({this.onPressed});
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final VoidCallback onPressed;
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@override
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Widget build(BuildContext context) {
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return new FloatingActionButton(
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onPressed: onPressed,
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tooltip: '增加',
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child: new Icon(Icons.add),
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);
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}
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}

‎projects/lib/mysample/list/ShoppingList.dart

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import 'package:flutter/material.dart';
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import 'ShoppingListItem.dart';
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/// ListView 购物清单 demo
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void main() {
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runApp(
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new MaterialApp(
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title: 'Flutter教程',
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home: new ShoppingList(products: _kProducts),
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),
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);
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}
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// 创建Products集合
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final List<Product> _kProducts = <Product>[
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new Product(name: '番茄'),
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new Product(name: '辣椒'),
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new Product(name: '茄子'),
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new Product(name: '芥蓝'),
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new Product(name: '黄瓜'),
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new Product(name: '白菜'),
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new Product(name: '西蓝花'),
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new Product(name: '韭菜'),
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new Product(name: '莲藕'),
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new Product(name: '西芹'),
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new Product(name: '土豆'),
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new Product(name: '冬瓜'),
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new Product(name: '胡瓜'),
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new Product(name: '豇豆'),
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new Product(name: '四季豆'),
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new Product(name: '红萝卜'),
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new Product(name: '白萝卜'),
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new Product(name: '胡萝卜'),
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new Product(name: '豆腐'),
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new Product(name: '山药'),
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new Product(name: '洋葱'),
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new Product(name: '豆芽'),
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new Product(name: '金针菇'),
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new Product(name: '香菇'),
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];
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class ShoppingList extends StatefulWidget {
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ShoppingList({Key key, this.products}) : super(key: key);
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final List<Product> products;
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@override
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_ShoppingListState createState() => new _ShoppingListState();
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}
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class _ShoppingListState extends State<ShoppingList> {
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Set<Product> _shoppingCart = new Set<Product>();
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void _handleCartChanged(Product product, bool inCart) {
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setState(() {
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if (inCart) {
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_shoppingCart.add(product);
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} else {
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_shoppingCart.remove(product);
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}
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});
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}
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@override
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Widget build(BuildContext context) {
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return new Scaffold(
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appBar: new AppBar(
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title: new Text('购物清单'),
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leading: new IconButton(
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icon: new Icon(Icons.menu), tooltip: '导航菜单', onPressed: null),
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),
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body: new ListView(
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children: widget.products.map((Product product) {
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return new ShoppingListItem(
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//监听
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product: product,
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inCart: _shoppingCart.contains(product),
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onCartChanged: _handleCartChanged,
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);
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}).toList(),
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),
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);
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}
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}

‎projects/lib/mysample/list/ShoppingListItem.dart

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import 'package:flutter/material.dart';
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import 'package:fluttertoast/fluttertoast.dart';
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class Product {
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const Product({this.name});
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final String name;
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}
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typedef void CartChangedCallback(Product p, bool inCart);
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class ShoppingListItem extends StatelessWidget {
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ShoppingListItem({this.product, this.inCart, this.onCartChanged});
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final Product product;
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final bool inCart;
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final CartChangedCallback onCartChanged;
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Color _getColor(BuildContext context) {
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// 默认是主题颜色，选中状态是deepPurpleAccent
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return inCart
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? Colors.deepPurpleAccent
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: Theme.of(context).primaryColorDark;
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}
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/// type: 用于区分是图形还是文字 0表示图形标识
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/// style：用于区分图形和文字哪个要绘制删除线，0表示需要给文字添加删除线。
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TextStyle _getTextStyle(BuildContext context, int type, int style) {
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if (!inCart) {
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//默认的状态
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return new TextStyle(
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color: type == 0 ? Colors.white : Theme.of(context).primaryColor,
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fontSize: 20.0,
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);
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} else {
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//选中状态
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return new TextStyle(
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color: type == 0 ? Colors.white : Colors.purpleAccent, //字体颜色
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decoration: style == 0 ? TextDecoration.lineThrough : null, //删除线
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decorationColor: style == 0 ? Colors.purple : null, //删除线颜色
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fontSize: 20.0,
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);
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}
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}
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@override
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Widget build(BuildContext context) {
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return new ListTile(
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onTap: () {
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onCartChanged(product, !inCart);
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Fluttertoast.showToast(
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msg: "点击了：" + "${product.name}",
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toastLength: Toast.LENGTH_SHORT,
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gravity: ToastGravity.BOTTOM,
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);
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},
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leading: new CircleAvatar(
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//左边的圆形标识
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backgroundColor: _getColor(context), //背景颜色
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child: new Text(product.name[0], //文字内容
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style: _getTextStyle(context, 0, 1)), //文字格式
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),
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title: new Text(product.name, // 文字内容
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style: _getTextStyle(context, 1, 0)), //文字格式
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);
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}
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}

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