Add:创建 flutter go web 版

lib/widgets/elements/Form/Button/DropdownButton/index.dart

@@ -1,74 +0,0 @@
-/// Created with FlutterGo.
-/// User: 一晟
-/// Date: 2018/11/14
-/// Time: 下午4:31
-/// email: zhu.yan@alibaba-inc.com
-/// target: DropdownButton 的示例
-/// 对应文档地址:https://docs.flutter.io/flutter/material/DropdownButton-class.html
-
-import 'package:flutter/material.dart';
-
-import 'package:flutter_go/components/widget_demo.dart';
-import 'demo.dart' as dropdownButton;
-
-const String _dropdownText0 =
-"""### **简介**
-> Dropdown button “用于从项目列表中进行选择的按钮”
-- 参数类型 T 是下拉菜单表示的值的类型。给定菜单中的所有条目必须表示具有一致类型的值。通常，使用枚举。每个DropdownMenuItem在项目必须专门与同类型的说法；
-""";
-
-const String _dropdownText1 =
-"""### **基本用法**
-> 此示例显示一个包含四个项目的菜单
-""";
-
-const String _dropdownText2 =
-"""### **进阶用法**
-> 此示例尝试调整所有属性，展示出效果
-""";
-
-class Demo extends StatefulWidget {
-  static const String routeName = '/element/Form/Button/DropdownButton';
-
-  @override
-  _DemoState createState() => _DemoState();
-}
-
-class _DemoState extends State<Demo> {
-  String buttonShapeType = 'border'; // 边框类型
-  void setButtonShapeType(){
-    //String _buttonShapeType = (buttonShapeType == 'border') ? 'radius' : 'border';
-    this.setState((){
-      //buttonShapeType = _buttonShapeType;
-    });
-  }
-  @override
-  Widget build(BuildContext context) {
-    return WidgetDemo(
-      title: 'DropdownButton',
-      codeUrl: 'elements/Form/Button/DropdownButton/demo.dart',
-      contentList: allDropdownButtons(context,this),
-      docUrl: 'https://docs.flutter.io/flutter/material/DropdownButton-class.html',
-    );
-  }
-}
-
-// 所有的 DropdownButton 按钮
-List allDropdownButtons(BuildContext context,_DemoState that){
-  return [
-    _dropdownText0,
-    _dropdownText1,
-    ButtonBar(
-      alignment: MainAxisAlignment.spaceAround,
-      mainAxisSize: MainAxisSize.max,
-      children: <Widget>[
-        dropdownButton.DropdownButtonDefault(),
-      ],
-    ),
-    _dropdownText2,
-    SizedBox(height: 10.0),
-    dropdownButton.DropdownButtonCustom(context.widget, that),
-    SizedBox(height: 20.0)
-  ];
-}
-