fix:back

lib/widgets/elements/Frame/Box/FittedBox/demo.dart

@@ -0,0 +1,47 @@
+import 'package:flutter/material.dart';
+import 'package:flutter/widgets.dart';
+
+/*
+ * Author: xiaojia.dxj
+ * Date: 2018/12/2
+ * Email: xiaojia.dxj@alibaba-inc.com
+ * LastUpdateTime: 2018/12/2
+ * LastUpdateBy: xj.deng
+ *
+ * Describle:FittedBox
+ */
+
+class FittedBoxDefault extends StatelessWidget {
+  final BoxFit curfit;
+  final String dec;
+
+  FittedBoxDefault({Key key, this.curfit, this.dec});
+
+  @override
+  Widget build(BuildContext context) {
+    return  Column(
+      children: <Widget>[
+        Container(
+          //外部有位置约束，内部大小设定失效，保持和外部约束一致
+          height: 100.0,
+          width: 100.0,
+          color: Color(0xfff8bbd0),
+          child: FittedBox(
+            fit: curfit,
+            // 修改child写入布局时期分配的空间
+            alignment: Alignment.center,
+            //alignment修改child于父空间对齐方式，默认：Alignment.center,
+            child: Container(
+              color: Color(0xfff48fb1),
+              child: Text(
+                'fittedBox',
+                style: TextStyle(color: Colors.white),
+              ),
+            ),
+          ),
+        ),
+        Text(dec),
+      ],
+    );
+  }
+}