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March 5, 2024 02:57
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| // [Author] Alex (https://github.com/AlexV525) | |
| // [Date] 2024/03/15 10:57 | |
| import 'package:flutter/material.dart'; | |
| void main() { | |
| runApp(const MyApp()); | |
| } | |
| class MyApp extends StatelessWidget { | |
| const MyApp({super.key}); | |
| @override | |
| Widget build(BuildContext context) { | |
| return MaterialApp( | |
| title: 'Flutter Demo', | |
| theme: ThemeData( | |
| colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple), | |
| useMaterial3: true, | |
| ), | |
| home: const MyHomePage(title: 'Flutter Demo Home Page'), | |
| ); | |
| } | |
| } | |
| class MyHomePage extends StatefulWidget { | |
| const MyHomePage({super.key, required this.title}); | |
| final String title; | |
| @override | |
| State<MyHomePage> createState() => _MyHomePageState(); | |
| } | |
| class _MyHomePageState extends State<MyHomePage> { | |
| @override | |
| Widget build(BuildContext context) { | |
| return Scaffold( | |
| appBar: AppBar( | |
| backgroundColor: Theme.of(context).colorScheme.inversePrimary, | |
| title: Text(widget.title), | |
| ), | |
| body: const Center( | |
| child: Column( | |
| mainAxisAlignment: MainAxisAlignment.center, | |
| children: <Widget>[ | |
| Text('Press to head over the list page.'), | |
| ], | |
| ), | |
| ), | |
| floatingActionButton: FloatingActionButton( | |
| onPressed: () { | |
| Navigator.of(context).push( | |
| MaterialPageRoute(builder: (context) => const _ListPage()), | |
| ); | |
| }, | |
| tooltip: 'Increment', | |
| child: const Icon(Icons.add), | |
| ), | |
| ); | |
| } | |
| } | |
| class _ListPage extends StatefulWidget { | |
| const _ListPage(); | |
| @override | |
| State<_ListPage> createState() => _ListPageState(); | |
| } | |
| class _ListPageState extends State<_ListPage> { | |
| final manager = _ItemDeleteMenuManager(); | |
| @override | |
| Widget build(BuildContext context) { | |
| return Scaffold( | |
| appBar: AppBar( | |
| backgroundColor: Theme.of(context).colorScheme.inversePrimary, | |
| title: Text('List page'), | |
| ), | |
| body: ListView.separated( | |
| itemCount: 50, | |
| itemBuilder: (context, index) { | |
| final link = LayerLink(); | |
| return CompositedTransformTarget( | |
| link: link, | |
| child: TextButton( | |
| onPressed: () => print(index), | |
| onLongPress: () { | |
| manager.show( | |
| context: context, | |
| item: index, | |
| link: link, | |
| onItemRemoved: () { | |
| print('Removed'); | |
| }, | |
| ); | |
| }, | |
| child: Text('$index'), | |
| ), | |
| ); | |
| }, | |
| separatorBuilder: (_, __) => const Divider(), | |
| ), | |
| ); | |
| } | |
| } | |
| class _ItemDeleteMenuManager { | |
| _ItemDeleteMenuManager(); | |
| final _itemEntries = <Object, OverlayEntry>{}; | |
| OverlayState _getState(BuildContext context) { | |
| return Overlay.of(context, rootOverlay: true); | |
| } | |
| void show({ | |
| required BuildContext context, | |
| required Object item, | |
| required LayerLink link, | |
| required void Function() onItemRemoved, | |
| VoidCallback? onCancel, | |
| }) { | |
| dismiss(context: context, item: item); | |
| final entry = OverlayEntry( | |
| builder: (context) => Stack( | |
| children: [ | |
| Positioned.fill( | |
| child: GestureDetector( | |
| behavior: HitTestBehavior.translucent, | |
| onTapDown: (_) { | |
| dismiss(context: context, item: item); | |
| }, | |
| ), | |
| ), | |
| CompositedTransformFollower( | |
| link: link, | |
| targetAnchor: Alignment.topCenter, | |
| followerAnchor: Alignment.bottomCenter, | |
| child: ColoredBox( | |
| color: Theme.of(context).colorScheme.inversePrimary, | |
| child: Row( | |
| mainAxisSize: MainAxisSize.min, | |
| children: AdaptiveTextSelectionToolbar.getAdaptiveButtons( | |
| context, | |
| [ | |
| ContextMenuButtonItem( | |
| onPressed: () { | |
| dismiss(context: context, item: item); | |
| }, | |
| label: '删除', | |
| ), | |
| ], | |
| ).toList(), | |
| ), | |
| ), | |
| ), | |
| ], | |
| ), | |
| ); | |
| _getState(context).insert(entry); | |
| _itemEntries[item] = entry; | |
| } | |
| void dismiss({required BuildContext context, required Object item}) { | |
| _itemEntries[item]?.remove(); | |
| _itemEntries.remove(item); | |
| } | |
| } |
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