初步优化项目结构

lib/widget_system/widgets/SingleChildRenderObjectWidget/UnConstrainedBox/node1_base.dart

@@ -0,0 +1,81 @@
+import 'package:flutter/material.dart';
+/// create by 张风捷特烈 on 2020-04-19
+/// contact me by email 1981462002@qq.com
+/// 说明:
+
+//    {
+//      "widgetId": 81,
+//      "name": 'UnConstrainedBox基本使用',
+//      "priority": 1,
+//      "subtitle":
+//          "【child】 : 孩子组件   【Widget】\n"
+//          "【constrainedAxis】 : 仍受约束的轴*2   【Axis】\n"
+//          "【alignment】 : 对齐方式   【AlignmentGeometry】",
+//    }
+class CustomUnConstrainedBox extends StatefulWidget {
+  @override
+  _CustomUnConstrainedBoxState createState() => _CustomUnConstrainedBoxState();
+}
+
+class _CustomUnConstrainedBoxState extends State<CustomUnConstrainedBox> {
+  var _value = false;
+
+  @override
+  Widget build(BuildContext context) {
+    return Wrap(
+      spacing: 20,
+      children: <Widget>[_buildUnconstrainedBox(), _buildConstrainedAxis()],
+    );
+  }
+
+  Widget _buildUnconstrainedBox() {
+    var child = Container(
+      color: Colors.cyanAccent,
+      width: 60,
+      height: 60,
+      child: Switch(
+        value: _value,
+        onChanged: (v) {
+          setState(() {
+            _value = v;
+          });
+        },
+      ),
+    );
+
+    return Column(
+      children: <Widget>[
+        Container(
+          color: Colors.grey.withAlpha(22),
+          width: 150,
+          height: 100,
+          child: _value
+              ? UnconstrainedBox(alignment: Alignment.center, child: child)
+              : child,
+        ),
+        Text(_value ? "已解除约束" : "子组件受约束")
+      ],
+    );
+  }
+
+  Widget _buildConstrainedAxis() {
+    return Column(
+      children: <Widget>[
+        Container(
+          color: Colors.grey.withAlpha(22),
+          width: 150,
+          height: 100,
+          child: UnconstrainedBox(
+              alignment: Alignment.center,
+              constrainedAxis: Axis.vertical,
+              child: Container(
+                color: Colors.cyanAccent,
+                width: 60,
+                height: 60,
+              )),
+        ),
+        Text("竖直方向仍约束")
+      ],
+    );
+  }
+}