X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fcontainer.h;h=d1120cd8c36bb1e25fb845f6a20831cc264c057c;hb=9fdbf99cdb3c5620e665c3ecb34e83d778cb311a;hp=ddccb06b7dd0e1f16faef7c34807e9444884d2b1;hpb=2bdaf4955fdb94e73704adcdcf0adc2b353f0ff0;p=libs%2Fgltk.git

diff --git a/source/container.h b/source/container.h
index ddccb06..d1120cd 100644
--- a/source/container.h
+++ b/source/container.h
@@ -1,20 +1,22 @@
-/* $Id$
-
-This file is part of libmspgltk
-Copyright © 2009-2011  Mikko Rasa, Mikkosoft Productions
-Distributed under the LGPL
-*/
-
 #ifndef MSP_GLTK_CONTAINER_H_
 #define MSP_GLTK_CONTAINER_H_
 
 #include <list>
+#include <stdexcept>
 #include <sigc++/trackable.h>
 #include "widget.h"
 
 namespace Msp {
 namespace GLtk {
 
+class hierarchy_error: public std::logic_error
+{
+public:
+	hierarchy_error(const std::string &);
+	virtual ~hierarchy_error() throw() { }
+};
+
+
 class Container: virtual public Widget
 {
 protected:
@@ -52,6 +54,8 @@ public:
 	virtual void pointer_leave();
 protected:
 	virtual void on_reparent();
+	virtual void on_child_added(Widget &) { }
+	virtual void on_child_removed(Widget &) { }
 };
 
 } // namespace GLtk