Created
January 7, 2019 22:22
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Pixel Launcher style transition between pages.
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| import 'package:flutter/material.dart'; | |
| class TestView extends StatefulWidget { | |
| @override | |
| _TestViewState createState() => _TestViewState(); | |
| } | |
| class _TestViewState extends State<TestView> { | |
| PageController pageController; | |
| double panPosition = 1; // dummy value prevents division with 0 | |
| double deviceHeight; | |
| void updatePageState() { | |
| setState(() { | |
| panPosition = | |
| pageController.position.pixels.abs(); // updates pan position | |
| }); | |
| } | |
| @override | |
| void initState() { | |
| // TODO: implement initState | |
| super.initState(); | |
| pageController = PageController( | |
| keepPage: true, | |
| ); | |
| pageController | |
| .addListener(updatePageState); // add listener to page controller. | |
| } | |
| @override | |
| Widget build(BuildContext context) { | |
| deviceHeight = | |
| MediaQuery.of(context).size.height; //get device screen height | |
| return Scaffold( | |
| backgroundColor: Colors.white, | |
| body: PageView( | |
| controller: pageController, | |
| scrollDirection: Axis.vertical, //vertical scroll | |
| children: <Widget>[ | |
| Opacity( | |
| // opacity handles the transition effect | |
| opacity: 1 - (panPosition / deviceHeight), | |
| //first screen opacity goes from 1 to 0 | |
| child: ScreenOne(), | |
| ), | |
| Opacity( | |
| opacity: (panPosition / deviceHeight), | |
| //first screen opacity goes from 0 to 1 | |
| child: ScreenTwo(), | |
| ) | |
| ], | |
| ), | |
| ); | |
| } | |
| } | |
| class ScreenOne extends StatelessWidget { | |
| @override | |
| Widget build(BuildContext context) { | |
| return Scaffold( | |
| appBar: AppBar( | |
| title: Text('Screen-1'), | |
| ), | |
| body: Column( | |
| mainAxisAlignment: MainAxisAlignment.end, | |
| crossAxisAlignment: CrossAxisAlignment.end, | |
| mainAxisSize: MainAxisSize.max, | |
| children: <Widget>[ | |
| Container( | |
| height: 96, | |
| color: Colors.red, | |
| ) | |
| ], | |
| ), | |
| ); | |
| } | |
| } | |
| class ScreenTwo extends StatelessWidget { | |
| @override | |
| Widget build(BuildContext context) { | |
| return Scaffold( | |
| appBar: AppBar( | |
| title: Text('Screen-2'), | |
| ), | |
| body: Center( | |
| child: Text('Screen-2'), | |
| ), | |
| ); | |
| } | |
| } |
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