Created
October 19, 2025 14:33
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Flutter Alliance demo 2
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| import 'package:animated_to/animated_to.dart'; | |
| import 'package:flutter/material.dart'; | |
| void main() => runApp(MaterialApp(home: DraggableDemoPage())); | |
| class DraggableDemoPage extends StatefulWidget { | |
| const DraggableDemoPage({super.key}); | |
| @override | |
| State<DraggableDemoPage> createState() => _DraggableDemoPageState(); | |
| } | |
| class _Item { | |
| _Item({required this.id, required this.color}); | |
| final String id; | |
| final Color color; | |
| } | |
| class _DraggableDemoPageState extends State<DraggableDemoPage> { | |
| final _cubes = List.generate( | |
| 40, | |
| (index) => _Item( | |
| id: index.toString(), | |
| color: Colors.primaries[index % Colors.primaries.length], | |
| ), | |
| ); | |
| @override | |
| Widget build(BuildContext context) { | |
| return Scaffold( | |
| body: Center( | |
| child: Padding( | |
| padding: const EdgeInsets.symmetric(horizontal: 16), | |
| child: Wrap( | |
| spacing: 16, | |
| runSpacing: 16, | |
| children: _cubes | |
| .map( | |
| (e) => _Cube( | |
| item: e, | |
| onAccept: (data) { | |
| final targetIndex = _cubes.indexOf(e); | |
| final draggingIndex = _cubes.indexOf(data); | |
| setState(() { | |
| final temp = _cubes[targetIndex]; | |
| _cubes[targetIndex] = _cubes[draggingIndex]; | |
| _cubes[draggingIndex] = temp; | |
| }); | |
| }, | |
| ), | |
| ) | |
| .toList(), | |
| ), | |
| ), | |
| ), | |
| ); | |
| } | |
| } | |
| class _Cube extends StatelessWidget { | |
| const _Cube({required this.item, required this.onAccept}); | |
| final _Item item; | |
| final ValueSetter<_Item> onAccept; | |
| @override | |
| Widget build(BuildContext context) { | |
| return AnimatedTo.curve( | |
| globalKey: GlobalObjectKey(item.id), | |
| child: DragTarget( | |
| onWillAcceptWithDetails: (details) { | |
| if (details.data == item) { | |
| return false; | |
| } | |
| onAccept(details.data as _Item); | |
| return true; | |
| }, | |
| builder: (context, candidateData, rejectedData) => Draggable( | |
| feedback: _CubeFace(color: item.color, size: 60), | |
| childWhenDragging: _CubeFace(color: Colors.transparent), | |
| data: item, | |
| child: _CubeFace(color: item.color), | |
| ), | |
| ), | |
| ); | |
| } | |
| } | |
| class _CubeFace extends StatelessWidget { | |
| const _CubeFace({required this.color, this.size = 60}); | |
| final Color color; | |
| final double size; | |
| @override | |
| Widget build(BuildContext context) { | |
| return Container( | |
| width: size, | |
| height: size, | |
| decoration: BoxDecoration(color: color, shape: BoxShape.circle), | |
| ); | |
| } | |
| } |
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