■ 스톱워치(Stopwatch)를 만드는 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 { MainPage({Key key}) : super(key: key); @override _MainPageState createState() => _MainPageState(); } class _MainPageState extends State<MainPage> { Timer _timer; int _timeCount = 0; bool _isRunning = false; List<String> _lapTimeList = []; @override void dispose() { _timer?.cancel(); super.dispose(); } Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: Text('스톱워치'), ), body: _buildBody(), bottomNavigationBar: BottomAppBar( child: Container( height: 50.0, ), ), floatingActionButton: FloatingActionButton( child: _isRunning ? Icon(Icons.pause) : Icon(Icons.play_arrow), onPressed: () => setState(() { _clickPlayButton(); }), ), floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked, ); } Widget _buildBody() { int secondCount = _timeCount ~/ 100; String hundredthCount = '${_timeCount % 100}'.padLeft(2, '0'); return Center( child: Padding( padding: const EdgeInsets.only(top: 30), child: Stack( children: <Widget>[ Column( children: <Widget>[ Row( mainAxisAlignment: MainAxisAlignment.center, crossAxisAlignment: CrossAxisAlignment.end, children: <Widget>[ Text( '$secondCount', style: TextStyle(fontSize: 50.0), ), Text('$hundredthCount'), ], ), Container( width: 100, height: 200, child: ListView( children: _lapTimeList.map((time) => Text(time)).toList(), ), ) ], ), Positioned( left: 10, bottom: 10, child: FloatingActionButton( backgroundColor: Colors.deepOrange, onPressed: _clickResetButton, child: Icon(Icons.rotate_left), ), ), Positioned( right: 10, bottom: 10, child: RaisedButton( onPressed: () { setState(() { _recordLapTime('$secondCount.$hundredthCount'); }); }, child: Text('랩타임'), ), ) ], ), ), ); } void _start() { _timer = Timer.periodic(Duration(milliseconds: 10), (timer) { setState(() { _timeCount++; }); }); } void _pause() { _timer?.cancel(); } void _clickPlayButton() { _isRunning = !_isRunning; if (_isRunning) { _start(); } else { _pause(); } } void _clickResetButton() { setState(() { _isRunning = false; _timer?.cancel(); _lapTimeList.clear(); _timeCount = 0; }); } void _recordLapTime(String time) { _lapTimeList.insert(0, '${_lapTimeList.length + 1}등 $time'); } } |
