forked from lxm_flutter/FlutterUnit
61 lines
1.8 KiB
Dart
61 lines
1.8 KiB
Dart
import 'package:flutter/material.dart';
|
|
|
|
/// create by 张风捷特烈 on 2020-03-16
|
|
/// contact me by email 1981462002@qq.com
|
|
/// 说明:
|
|
|
|
// {
|
|
// "widgetId": 55,
|
|
// "name": 'DropdownButton基本用法',
|
|
// "priority": 1,
|
|
// "subtitle":
|
|
// "【value】 : 当前值 【T】\n"
|
|
// "【items】 : 下拉选框 【List<DropdownMenuItem<T>>】\n"
|
|
// "【icon】 : 图标 【Widget】\n"
|
|
// "【elevation】 : 影深 【double】\n"
|
|
// "【onChanged】 : 选择条目事件 【Function(T)】\n"
|
|
// "【backgroundColor】 : 背景色 【Color】",
|
|
// }
|
|
class CustomDropDownButton extends StatefulWidget {
|
|
@override
|
|
_CustomDropDownButtonState createState() => _CustomDropDownButtonState();
|
|
}
|
|
|
|
class _CustomDropDownButtonState extends State<CustomDropDownButton> {
|
|
Color _color = Colors.red;
|
|
final _colors = [Colors.red, Colors.yellow, Colors.blue, Colors.green];
|
|
final _info = ["红色", "黄色", "蓝色", "绿色"];
|
|
|
|
@override
|
|
Widget build(BuildContext context) {
|
|
return Wrap(
|
|
children: <Widget>[
|
|
Container(
|
|
margin: EdgeInsets.symmetric(horizontal: 20),
|
|
width: 50,
|
|
height: 50,
|
|
color: _color,
|
|
),
|
|
DropdownButton<Color>(
|
|
value: _color,
|
|
elevation: 1,
|
|
icon: Icon(
|
|
Icons.expand_more,
|
|
size: 20,
|
|
color: _color,
|
|
),
|
|
items: _buildItems(),
|
|
onChanged: (v) => setState(() => _color = v)),
|
|
],
|
|
);
|
|
}
|
|
|
|
List<DropdownMenuItem<Color>> _buildItems() => _colors
|
|
.map((e) => DropdownMenuItem<Color>(
|
|
value: e,
|
|
child: Text(
|
|
_info[_colors.indexOf(e)],
|
|
style: TextStyle(color: e),
|
|
)))
|
|
.toList();
|
|
} |