初步优化项目结构

lib/widget_system/widgets/MultiChildRenderObjectWidget/IndexedStack/node1_base.dart

@@ -0,0 +1,61 @@
+import 'package:flutter/material.dart';
+
+/// create by 张风捷特烈 on 2020-03-26
+/// contact me by email 1981462002@qq.com
+/// 说明:
+
+//    {
+//      "widgetId": 161,
+//      "name": 'IndexedStack基本使用',
+//      "priority":1 ,
+//      "subtitle":
+//          "【children】 : 子组件列表   【Lis<Widget>】\n"
+//          "【alignment】 : 对齐方式   【AlignmentGeometry】\n"
+//          "【index】 : 当前显示组件  【int】",
+//    }
+class CustomIndexedStack extends StatefulWidget {
+  @override
+  _CustomIndexedStackState createState() => _CustomIndexedStackState();
+}
+
+class _CustomIndexedStackState extends State<CustomIndexedStack> {
+  var _index = 1;
+
+  @override
+  Widget build(BuildContext context) {
+    return Column(
+      children: <Widget>[
+        _buildSwitch(),
+        Container(
+          width: 200,
+          height: 100,
+          color: Colors.grey.withAlpha(33),
+          child: IndexedStack(
+            index: _index,
+            children: <Widget>[
+              Container(
+                color: Colors.red,
+                width: 80,
+                height: 80,
+              ),
+              Positioned(
+                bottom: 10,
+                right: 10,
+                child: Container(
+                  color: Colors.blue,
+                  width: 80,
+                  height: 80,
+                ),
+              )
+            ],
+          ),
+        ),
+      ],
+    );
+  }
+
+  Widget _buildSwitch() => Switch(
+        value: _index == 0,
+        onChanged: (v) => setState(() => _index = v ? 0 : 1),
+      );
+}