create a lot of GUI source code files.

inc/hgl/gui/Panel.h

@@ -0,0 +1,21 @@
+#ifndef HGL_GUI_PANEL_INCLUDE
+#define HGL_GUI_PANEL_INCLUDE
+
+#include<hgl/gui/Widget.h>
+namespace hgl
+{
+    namespace gui
+    {
+        class Panel:public Widget
+        {
+        public:
+
+            Panel(Widget *p):Widget(p){}
+
+            virtual ~Panel()=default;
+
+            void Draw() override;
+        };//class Panel:public Widget
+    }//namespace gui
+}//namespace hgl
+#endif//HGL_GUI_PANEL_INCLUDE