forked from lxm_flutter/FlutterUnit
102 lines
2.7 KiB
Dart
102 lines
2.7 KiB
Dart
import 'package:flutter/material.dart';
|
|
|
|
/// create by 张风捷特烈 on 2020-03-22
|
|
/// contact me by email 1981462002@qq.com
|
|
/// 说明:
|
|
|
|
// {
|
|
// "widgetId": 104,
|
|
// "name": 'DragTarget基本使用',
|
|
// "priority": 1,
|
|
// "subtitle":
|
|
// "【builder】 : 组件构造器 【DragTargetBuilder<T>】\n"
|
|
// "【onWillAccept】 : 拖入时 【Function(T)】\n"
|
|
// "【onAccept】 : 拖拽成功 【Function(T)】\n"
|
|
// "【onLeave】 : 拖入再脱出 【Function(T)】",
|
|
// }
|
|
|
|
class CustomDragTarget extends StatefulWidget {
|
|
@override
|
|
_CustomDragTargetState createState() => _CustomDragTargetState();
|
|
}
|
|
|
|
class _CustomDragTargetState extends State<CustomDragTarget> {
|
|
Color _color = Colors.grey;
|
|
String _info = 'DragTarget';
|
|
|
|
@override
|
|
Widget build(BuildContext context) {
|
|
return Container(
|
|
child: Column(
|
|
children: <Widget>[
|
|
Wrap(
|
|
children: _buildColors(),
|
|
spacing: 10,
|
|
),
|
|
SizedBox(height: 20,),
|
|
_buildDragTarget()
|
|
],
|
|
),
|
|
);
|
|
}
|
|
|
|
List<Widget> _buildColors() {
|
|
var colors = [
|
|
Colors.red,
|
|
Colors.yellow,
|
|
Colors.blue,
|
|
Colors.green,
|
|
Colors.orange,
|
|
Colors.purple,
|
|
Colors.cyanAccent
|
|
];
|
|
return colors
|
|
.map(
|
|
(e) => Draggable<Color>(
|
|
child: Container(
|
|
width: 30,
|
|
height: 30,
|
|
alignment: Alignment.center,
|
|
child: Text(
|
|
colors.indexOf(e).toString(),
|
|
style: TextStyle(
|
|
color: Colors.white, fontWeight: FontWeight.bold),
|
|
),
|
|
decoration: BoxDecoration(color: e, shape: BoxShape.circle),
|
|
),
|
|
data: e,
|
|
feedback: Container(
|
|
width: 25,
|
|
height: 25,
|
|
decoration: BoxDecoration(color: e, shape: BoxShape.circle),
|
|
)),
|
|
)
|
|
.toList();
|
|
}
|
|
|
|
Widget _buildDragTarget() {
|
|
return DragTarget<Color>(
|
|
onLeave: (data) => setState(() => _info='onLeave'),
|
|
onAccept: (data) => setState(() {
|
|
_info='onAccept';
|
|
_color = data;
|
|
}),
|
|
onWillAccept: (data) {
|
|
setState(() {
|
|
_info='onWillAccept';
|
|
});
|
|
print("onWillAccept: data = $data ");
|
|
return data != null;
|
|
},
|
|
builder: (context, candidateData, rejectedData) => Container(
|
|
width: 150.0,
|
|
height: 50.0,
|
|
color: _color,
|
|
child: Center(
|
|
child: Text(
|
|
_info,
|
|
style: TextStyle(color: Colors.white),
|
|
),
|
|
)));
|
|
}
|
|
} |