Created
April 28, 2023 14:24
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Remeber scroll position
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| class RememberScrollPosition extends StatefulWidget { | |
| const RememberScrollPosition({super.key}); | |
| @override | |
| State<RememberScrollPosition> createState() => _RememberScrollPositionState(); | |
| } | |
| class _RememberScrollPositionState extends State<RememberScrollPosition> { | |
| int currentIndex = 0; | |
| @override | |
| Widget build(BuildContext context) { | |
| return Scaffold( | |
| appBar: AppBar( | |
| title: const Text('Remember scroll position'), | |
| ), | |
| body: const [ | |
| Page(name: 'First'), | |
| Page(name: 'Second'), | |
| Page(name: 'Third'), | |
| ][currentIndex], | |
| bottomNavigationBar: BottomNavigationBar( | |
| currentIndex: currentIndex, | |
| onTap: (index) => setState(() => currentIndex = index), | |
| items: const [ | |
| BottomNavigationBarItem( | |
| icon: Icon(Icons.home), | |
| label: 'Page 1', | |
| ), | |
| BottomNavigationBarItem( | |
| icon: Icon(Icons.star), | |
| label: 'Page 2', | |
| ), | |
| BottomNavigationBarItem( | |
| icon: Icon(Icons.favorite), | |
| label: 'Page 3', | |
| ), | |
| ], | |
| ), | |
| ); | |
| } | |
| } | |
| class Page extends StatelessWidget { | |
| const Page({super.key, required this.name}); | |
| final String name; | |
| @override | |
| Widget build(BuildContext context) { | |
| return ListView.builder( | |
| // Magic happens here | |
| // Caches the scroll position on the key | |
| key: PageStorageKey(name), | |
| itemBuilder: (_, i) => Card( | |
| child: Padding( | |
| padding: const EdgeInsets.all(32), | |
| child: Text('Page $name - $i'), | |
| ), | |
| ), | |
| ); | |
| } | |
| } |
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