forked from lxm_flutter/FlutterUnit
91 lines
2.2 KiB
Dart
91 lines
2.2 KiB
Dart
import 'package:flutter/material.dart';
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/// create by 张风捷特烈 on 2020/4/28
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/// contact me by email 1981462002@qq.com
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/// 说明:
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// {
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// "widgetId": 103,
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// "name": 'Draggable其他使用',
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// "priority": 3,
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// "subtitle":
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// "可以根据拖拽来处理一些事件。如删除、查询、弹框等",
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// }
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class DeleteDraggable extends StatefulWidget {
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@override
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_DeleteDraggableState createState() => _DeleteDraggableState();
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}
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class _DeleteDraggableState extends State<DeleteDraggable> {
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List<Color> colors = [
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Colors.red,
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Colors.yellow,
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Colors.blue,
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Colors.green,
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Colors.orange,
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Colors.purple,
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Colors.cyanAccent
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];
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@override
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Widget build(BuildContext context) {
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return Container(
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child: Column(
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children: <Widget>[
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Wrap(
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children: _buildColors(),
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spacing: 10,
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),
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SizedBox(
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height: 20,
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),
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_buildDragTarget()
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],
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),
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);
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}
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Widget _buildDragTarget() {
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return DragTarget<int>(
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onAccept: (data) {
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setState(() {
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colors.removeAt(data);
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});
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},
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onWillAccept: (data) => data != null,
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builder: (context, candidateData, rejectedData) => Container(
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width: 50.0,
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height: 50.0,
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decoration:
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BoxDecoration(color: Colors.red, shape: BoxShape.circle),
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child: Center(
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child: Icon(Icons.delete_sweep, color: Colors.white),
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)));
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}
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List<Widget> _buildColors() => colors
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.map(
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(e) => Draggable<int>(
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child: Container(
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width: 30,
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height: 30,
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alignment: Alignment.center,
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child: Text(
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colors.indexOf(e).toString(),
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style:
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TextStyle(color: Colors.white, fontWeight: FontWeight.bold),
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),
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decoration: BoxDecoration(color: e, shape: BoxShape.circle),
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),
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data: colors.indexOf(e),
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feedback: Container(
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width: 25,
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height: 25,
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decoration: BoxDecoration(
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color: e.withAlpha(100), shape: BoxShape.circle),
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)),
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)
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.toList();
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}
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