add file

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

@@ -0,0 +1,57 @@
+import 'package:flutter/material.dart';
+import 'package:flutter/widgets.dart';
+
+class SizeOverflowBoxDefault extends StatelessWidget {
+  final double curSizeWidth;
+  final double curSizeHeight;
+  final String text;
+
+  SizeOverflowBoxDefault(
+      {Key key,
+      double this.curSizeWidth,
+      double this.curSizeHeight,
+      String this.text})
+      : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return SizedOverflowBox(
+      size: Size(curSizeWidth, curSizeHeight),
+      alignment: Alignment.centerRight,
+      //size属性设置了大小，container 里面的大小失效,
+      child: Container(
+        color: Color(0xfff06292),
+        width: 50.0,
+        height: 50.0,
+        child: new Text(
+          text,
+          style: TextStyle(color: Colors.white),
+        ),
+      ),
+    );
+  }
+}
+
+class SizeBoxDefault extends StatelessWidget {
+  final double curWidth;
+  final double curHeight;
+
+  SizeBoxDefault({Key key, double this.curHeight, double this.curWidth})
+      : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return SizedBox(
+      width: curWidth,
+      height: curHeight,
+      child: const Card(
+        child: Text(
+          'SizedBox',
+          style: TextStyle(color: Colors.white),
+          textDirection: TextDirection.rtl,
+        ),
+        color: Color(0xfff06292),
+      ),
+    );
+  }
+}