初步优化项目结构

lib/widget_system/widgets/StatefulWidget/ExpandIcon/node1_base.dart

@@ -0,0 +1,36 @@
+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": 51,
+//      "name": 'ExpandIcon基本使用',
+//      "priority": 1,
+//      "subtitle":
+//          "【isExpanded】 : 是否展开   【bool】\n"
+//          "【padding】 : 内边距   【EdgeInsetsGeometry】\n",
+//          "【size】 : 图标大小   【double】\n"
+//          "【color】 : 不展开时颜色   【Color】\n"
+//          "【expandedColor】 : 展开时颜色   【Color】\n"
+//          "【onPressed】 : 点击事件   【Function(bool)】",
+//    }
+class CustomExpandIcon extends StatefulWidget {
+  @override
+  _CustomExpandIconState createState() => _CustomExpandIconState();
+}
+
+class _CustomExpandIconState extends State<CustomExpandIcon> {
+  var _closed = true;
+
+  @override
+  Widget build(BuildContext context) {
+    return ExpandIcon(
+      isExpanded: _closed,
+      padding: EdgeInsets.all(5),
+      size: 30,
+      color: Colors.blue,
+      expandedColor: Colors.orangeAccent,
+      onPressed: (value) => setState(() => _closed = !_closed),
+    );
+  }
+}