■ Timer 클래스에서 periodic 팩토리 생성자를 사용하는 방법을 보여준다.
▶ main.dart
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import 'dart:async'; import 'package:flutter/material.dart'; void main() { runApp(TestApplication()); } class TestApplication extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( title: 'Test Application', theme: ThemeData( primarySwatch: Colors.blue, ), home: MainPage(), ); } } class MainPage extends StatefulWidget { @override _MainPageState createState() => _MainPageState(); } class _MainPageState extends State<MainPage> { Timer _timer; bool _isRunning = false; int _timerCount = 0; String _buttonText = 'Start'; @override void dispose() { _timer?.cancel(); super.dispose(); } @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: Text('Test Application'), ), body: Center( child: Column( mainAxisAlignment: MainAxisAlignment.center, children: [ RaisedButton( child: Text("$_buttonText"), color: Colors.orange, onPressed: () { _isRunning = !_isRunning; if (_isRunning) { setState(() { _timerCount = 0; _buttonText = 'Stop'; }); _timer = Timer.periodic(Duration(milliseconds: 10), (timer) { setState(() { _timerCount++; }); }); } else { _timer?.cancel(); setState(() { _buttonText = 'Start'; }); } }, ), Padding( padding: const EdgeInsets.only(top: 10.0), child: Text("$_timerCount"), ), ], ), ), ); } } |
