Add:创建 flutter go web 版

lib/widgets/elements/Form/Button/DropdownButton/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: DropdownButton 的示例
-
-import 'package:flutter/material.dart';
-
-// DropdownButton 默认按钮的实例
-// isDisabled:是否是禁用，isDisabled 默认为true
-var selectItValue;
-var selectItemValue;
-
-class DropdownButtonDefault extends StatelessWidget {
-   List<DropdownMenuItem> generateItemList() {
-    final List<DropdownMenuItem> items =  List();
-    final DropdownMenuItem item1 =  DropdownMenuItem(
-        value: '张三', child:  Text('张三'));
-    final DropdownMenuItem item2 =  DropdownMenuItem(
-        value: '李四', child:  Text('李四'));
-    final DropdownMenuItem item3 =  DropdownMenuItem(
-        value: '王二', child:  Text('王二'));
-    final DropdownMenuItem item4 =  DropdownMenuItem(
-        value: '麻子', child:  Text('麻子'));
-    items.add(item1);
-    items.add(item2);
-    items.add(item3);
-    items.add(item4);
-    return items;
-  }
-
-  @override
-  Widget build(BuildContext context) {
-    return DropdownButton(
-        hint:  Text('下拉菜单选择一个人名'),
-        //设置这个value之后,选中对应位置的item，
-        //再次呼出下拉菜单，会自动定位item位置在当前按钮显示的位置处
-        value: selectItValue,
-        items: generateItemList(),
-        onChanged: (T){
-//          setState(() {
-//          selectItemValue=T;
-//          });
-        },
-    );
-  }
-}
-
-List<DropdownMenuItem> getListData(){
-  List<DropdownMenuItem> items= List();
-  DropdownMenuItem dropdownMenuItem1= DropdownMenuItem(
-    child: Text('1'),
-    value: '1',
-  );
-  items.add(dropdownMenuItem1);
-  DropdownMenuItem dropdownMenuItem2= DropdownMenuItem(
-    child: Text('2'),
-    value: '2',
-  );
-  items.add(dropdownMenuItem2);
-  DropdownMenuItem dropdownMenuItem3= DropdownMenuItem(
-    child: Text('3'),
-    value: '3',
-  );
-  items.add(dropdownMenuItem3);
-  DropdownMenuItem dropdownMenuItem4= DropdownMenuItem(
-    child: Text('4'),
-    value: '4',
-  );
-  items.add(dropdownMenuItem4);
-  DropdownMenuItem dropdownMenuItem5= DropdownMenuItem(
-    child: Text('5'),
-    value: '5',
-  );
-  items.add(dropdownMenuItem5);
-  DropdownMenuItem dropdownMenuItem6= DropdownMenuItem(
-    child: Text('6'),
-    value: '6',
-  );
-  items.add(dropdownMenuItem6);
-  DropdownMenuItem dropdownMenuItem7= DropdownMenuItem(
-    child: Text('7'),
-    value: '7',
-  );
-  items.add(dropdownMenuItem7);
-  DropdownMenuItem dropdownMenuItem8= DropdownMenuItem(
-    child: Text('8'),
-    value: '8',
-  );
-  items.add(dropdownMenuItem8);
-  DropdownMenuItem dropdownMenuItem9= DropdownMenuItem(
-    child: Text('9'),
-    value: '9',
-  );
-  items.add(dropdownMenuItem9);
-  DropdownMenuItem dropdownMenuItem10= DropdownMenuItem(
-    child: Text('10'),
-    value: '10',
-  );
-  items.add(dropdownMenuItem10);
-  return items;
-}
-
-// DropdownButton 自定义的实例
-class DropdownButtonCustom extends StatelessWidget {
-  final widget;
-  final parent;
-  const DropdownButtonCustom([this.widget,this.parent])
-      : super();
-
-  @override
-  Widget build(BuildContext context) {
-    return DropdownButton(
-        items: getListData(),
-        //当没有默认值的时候可以设置的提示
-        hint:Text('下拉选择你想要的数据'),
-        //下拉菜单选择完之后显示给用户的值
-        value: selectItemValue,
-        //下拉菜单item点击之后的回调
-        onChanged: (T){
-          if (parent.mounted) {
-            parent.setState(() {
-              selectItemValue = T;
-            });
-          }
-        },
-        //设置阴影的高度
-        elevation: 24,
-        style: TextStyle(//设置文本框里面文字的样式
-            color: Colors.red
-        ),
-        // isDense: true,//减少按钮的高度。默认情况下，此按钮的高度与其菜单项的高度相同。如果isDense为true，则按钮的高度减少约一半。 这个当按钮嵌入添加的容器中时，非常有用
-        // 将下拉列表的内部内容设置为水平填充其父级
-        isExpanded:true,
-        iconSize: 50.0,//设置三角标icon的大小
-    );
-  }
-}