Add:创建 flutter go web 版

lib/widgets/elements/Form/Button/PopupMenuButton/demo.dart

@@ -1,139 +0,0 @@
-/// Created with Android Studio.
-/// User: 一晟
-/// Date: 2018/11/22
-/// Time: 上午12:03
-/// email: zhu.yan@alibaba-inc.com
-/// target: PopupMenuButton 的示例
-
-import 'package:flutter/material.dart';
-
-// RaisedButton 默认按钮的实例
-// isDisabled:是否是禁用，isDisabled 默认为true
-enum WhyFarther { harder, smarter, selfStarter, tradingCharter }
-
-class PopupMenuButtonDefault extends StatelessWidget {
-  final bool isDisabled;
-  final String type;
-
-  const PopupMenuButtonDefault(
-      [ this.type = 'default1',  this.isDisabled = true])
-      : assert(isDisabled != null),
-        super();
-
-  @override
-  Widget build(BuildContext context) {
-    switch (type) {
-      case 'default1':
-        return default1(context);
-        break;
-      case 'default2':
-        return default2(context);
-        break;
-      case 'default3':
-        return default3(context);
-        break;
-      default:
-        return default1(context);
-    }
-  }
-
-  Widget default1(BuildContext context) {
-    return PopupMenuButton<WhyFarther>(
-      onSelected: (WhyFarther result) {
-        // setState(() { _selection = result; });
-      },
-      itemBuilder: (BuildContext context) => <PopupMenuEntry<WhyFarther>>[
-            const PopupMenuItem<WhyFarther>(
-              value: WhyFarther.harder,
-              child: Text('Working a lot harder'),
-            ),
-            const PopupMenuItem<WhyFarther>(
-              value: WhyFarther.smarter,
-              child: Text('Being a lot smarter'),
-            ),
-            const PopupMenuItem<WhyFarther>(
-              value: WhyFarther.selfStarter,
-              child: Text('Being a self-starter'),
-            ),
-            const PopupMenuItem<WhyFarther>(
-              value: WhyFarther.tradingCharter,
-              child: Text('Placed in charge of trading charter'),
-            ),
-          ],
-    );
-  }
-
-  Widget default2(BuildContext context) {
-    return PopupMenuButton(
-        child: Text('点我试试'),
-        onSelected: (String value) {},
-        itemBuilder: (BuildContext context) => <PopupMenuItem<String>>[
-               PopupMenuItem(value: "选项一的内容", child:  Text("选项一")),
-               PopupMenuItem(value: "选项二的内容", child:  Text("选项二"))
-            ]);
-  }
-
-  Widget default3(BuildContext context) {
-    return PopupMenuButton(
-        //child: Text('点我试试'),// child 和 icon 不能同时用
-        icon: Icon(Icons.menu),
-        onSelected: (String value) {},
-        itemBuilder: (BuildContext context) => <PopupMenuItem<String>>[
-               PopupMenuItem(value: "选项一的内容", child:  Text("选项一")),
-               PopupMenuItem(value: "选项二的内容", child:  Text("选项二"))
-            ]);
-  }
-}
-
-
-class PopupMenuButtonCustom extends StatelessWidget {
-  final widget;
-  final parent;
-  const PopupMenuButtonCustom([this.widget,this.parent])
-      : super();
-  @override
-  Widget build(BuildContext context) {
-    final String selectStr = widget.options['defaultSelect'];
-    return PopupMenuButton(
-        //如果提供，则用于此按钮的widget。
-        child: RaisedButton.icon(
-          disabledColor:Colors.red,
-          icon: Icon(Icons.message, size: 25.0,color:Colors.yellow),
-          label: Text(
-                '自定义按钮', style: TextStyle(color: Colors.white),
-                semanticsLabel: 'FLAT BUTTON'),
-          onPressed:(){} // 激活状态按钮
-        ),
-        // 打开时放置菜单的z坐标。这可以控制菜单下方阴影的大小。
-        elevation:10.0,
-        // 如果提供，则用于此按钮的图标。
-        //icon
-        // 菜单项的值（如果有），在菜单打开时应突出显示。
-        //initialValue:options['defaultSelect'],
-        initialValue:selectStr,
-        // 按下按钮时调用以创建要在菜单中显示的项目。
-        itemBuilder: (BuildContext context) => <PopupMenuItem<String>>[
-           PopupMenuItem(value: "选项一的内容", child:  Text("选项一")),
-           PopupMenuItem(value: "选项二的内容", child:  Text("选项二")),
-           PopupMenuItem(value: "选项三的内容", child:  Text("选项三")),
-           PopupMenuItem(value: "选项四的内容", child:  Text("选项四"))
-        ],
-        // 应用于弹出菜单按钮的偏移量(x,y)。
-        offset:Offset(0.0,50.0),
-        // 当用户在不选择项目的情况下关闭弹出菜单时调用。
-        onCanceled:()=>
-          print('onCanceled'),
-        // 当用户从此按钮创建的弹出菜单中选择一个值时调用。
-        onSelected:(String value){
-          print('onSelected:${parent.setState}');
-          parent.setState((){
-            widget.options['defaultSelect']= value;
-          });
-        },
-        // 默认情况下匹配IconButton的8 dps填充。在某些情况下，特别是在此按钮作为列表项的尾随元素出现的情况下，能够将填充设置为零是有用的。
-        padding: EdgeInsets.only(bottom: 20.0, top: 20.0, left: 0.0, right: 0.0),
-        //描述按下按钮时将发生的操作的文本。
-        tooltip:'这是信息'
-    );
-  }
-}