| import 'package:flutter/material.dart'; |
| import 'package:english_words/english_words.dart'; |
| |
| void main() => runApp(Myapp()); |
| |
| class Myapp extends StatelessWidget { |
| @override |
| Widget build(BuildContext context) { |
| return MaterialApp(home: MyHome()); |
| } |
| } |
| |
| class MyHome extends StatefulWidget { |
| @override |
| _MyHomeState createState() => _MyHomeState(); |
| } |
| |
| class _MyHomeState extends State<MyHome> { |
| final _suggestions = <WordPair>[]; |
| bool _loading = true; |
| ScrollController _strollCtrl = ScrollController(); |
| |
| Future<void> _getData() async { |
| await Future.delayed(Duration(seconds: 1)); |
| setState(() { |
| _suggestions.addAll(generateWordPairs().take(15)); |
| _loading = false; |
| }); |
| } |
| |
| @override |
| void initState() { |
| _getData(); |
| _strollCtrl.addListener(() { |
| if (_strollCtrl.position.pixels == _strollCtrl.position.maxScrollExtent) { |
| if (!_loading) { |
| setState(() { |
| _loading = true; |
| }); |
| } |
| _getData(); |
| } |
| }); |
| super.initState(); |
| } |
| |
| @override |
| void dispose() { |
| _strollCtrl.dispose(); |
| super.dispose(); |
| } |
| |
| @override |
| Widget build(BuildContext context) { |
| return Scaffold( |
| appBar: AppBar( |
| title: Text('ListView'), |
| ), |
| body: Stack( |
| children: <Widget>[ |
| _loading |
| ? Center( |
| child: Column( |
| mainAxisAlignment: MainAxisAlignment.center, |
| children: <Widget>[ |
| RefreshProgressIndicator( |
| semanticsLabel: 'loading more..', |
| semanticsValue: 'loading more..', |
| ), |
| Text( |
| '加载中...', |
| style: Theme.of(context).textTheme.title, |
| ), |
| ], |
| ), |
| ) |
| : Container(), |
| |
| RefreshIndicator( |
| onRefresh: () async { |
| _suggestions.clear(); |
| return _getData(); |
| }, |
| child: ListView.builder( |
| physics: const AlwaysScrollableScrollPhysics(), |
| controller: _strollCtrl, |
| itemCount: _suggestions.length, |
| itemBuilder: (context, i) { |
| return ListTile( |
| leading: Text('${(i + 1).toString()}'), |
| title: Text('${_suggestions[i].asPascalCase}'), |
| trailing: Icon(Icons.event), |
| ); |
| }, |
| ), |
| ), |
| ], |
| ), |
| ); |
| } |
| } |
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