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How to play with the red box
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| import 'package:flutter/material.dart'; | |
| final Color darkBlue = Color.fromARGB(255, 18, 32, 47); | |
| void main() { | |
| runApp(MyApp()); | |
| } | |
| class MyApp extends StatelessWidget { | |
| @override | |
| Widget build(BuildContext context) { | |
| return MaterialApp( | |
| debugShowCheckedModeBanner: false, | |
| home: Scaffold( | |
| body: TestView(), | |
| ), | |
| ); | |
| } | |
| } | |
| final greenBigBox = Container(height: 700, color: Colors.green); | |
| final yellowLitleBox = Container(height: 200, color: Colors.yellow); | |
| class TestView extends StatefulWidget { | |
| @override | |
| _TestViewState createState() => _TestViewState(); | |
| } | |
| class _TestViewState extends State<TestView> { | |
| List<Widget> _switchers = [greenBigBox, yellowLitleBox]; | |
| int _currentWidget = 0; | |
| int _counter = 0; | |
| nextStep() { | |
| if (_currentWidget > _switchers.length) { | |
| return; | |
| } | |
| setState(() => ++_currentWidget); | |
| } | |
| previousStep() { | |
| if (_currentWidget == 0) { | |
| return; | |
| } | |
| setState(() => --_currentWidget); | |
| } | |
| @override | |
| Widget build(BuildContext context) { | |
| return Stack(children: [ | |
| Positioned.fill( | |
| child: GestureDetector( | |
| onTap: () => setState(() => _counter++), | |
| child: Container( | |
| color: Colors.red, | |
| child: Center(child: Text('tap for increment - counter : $_counter'))))), | |
| Positioned( | |
| bottom: 0, | |
| height: MediaQuery.of(context).size.height, | |
| width: MediaQuery.of(context).size.width, | |
| child: SingleChildScrollView( | |
| child: Container( | |
| margin: EdgeInsets.only( | |
| top: MediaQuery.of(context).size.height - 145), | |
| width: MediaQuery.of(context).size.width, | |
| color: Colors.grey, | |
| child: Column( | |
| children: <Widget>[ | |
| Row( | |
| children: <Widget>[ | |
| MaterialButton( | |
| onPressed: () => previousStep(), | |
| child: Text('Previous'), | |
| ), | |
| MaterialButton( | |
| onPressed: () => nextStep(), | |
| child: Text('Next'), | |
| ) | |
| ], | |
| ), | |
| AnimatedSwitcher( | |
| duration: Duration(milliseconds: 200), | |
| child: _switchers[_currentWidget], | |
| ) | |
| ], | |
| ), | |
| ), | |
| )) | |
| ]); | |
| } | |
| } |
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