初步优化项目结构

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

@@ -0,0 +1,54 @@
+import 'package:flutter/material.dart';
+/// create by 张风捷特烈 on 2020/4/30
+/// contact me by email 1981462002@qq.com
+/// 说明:
+//    {
+//      "widgetId": 49,
+//      "name": 'RefreshIndicator基本使用',
+//      "priority": 1,
+//      "subtitle":
+//          "【child】 : 孩子(可滑动)   【Widget】\n"
+//          "【displacement】 : 指示器悬浮高度   【double】\n"
+//          "【color】 : 指示器颜色   【Color】\n",
+//          "【backgroundColor】 : 指示器背景色   【Color】\n"
+//          "【onRefresh】 : 异步函数   【Future<void> Function()】"
+//    }
+class CustomRefreshIndicator extends StatefulWidget {
+  @override
+  _CustomRefreshIndicatorState createState() => _CustomRefreshIndicatorState();
+}
+
+class _CustomRefreshIndicatorState extends State<CustomRefreshIndicator> {
+  int _count = 0;
+
+  @override
+  Widget build(BuildContext context) {
+
+    return Container(
+      height: 200,
+      width: 200,
+      child: RefreshIndicator(
+        onRefresh: _increment,
+        displacement: 20,
+        color: Colors.orange,
+        backgroundColor: Colors.white,
+        child: SingleChildScrollView(
+          child: Container(
+            alignment: Alignment.center,
+            width: 200,
+            height: 300,
+            color: Colors.blue,
+            child: Text('$_count',style: TextStyle(color: Colors.white,fontSize: 40)),
+          ),
+        ),
+      ),
+    );
+  }
+
+  Future<void> _increment() async {
+    await Future.delayed(Duration(seconds: 2));
+    setState(() {
+      _count++;
+    });
+  }
+}