3 files changed, 80 insertions, 0 deletions
diff --git a/src/xml/Makefile_insert b/src/xml/Makefile_insert
index 9ca81b231..3321031c9 100644
--- a/src/xml/Makefile_insert
+++ b/src/xml/Makefile_insert
@@ -18,6 +18,8 @@ xml_libspxml_a_SOURCES =	\
 	xml/comment-node.h \
 	xml/composite-node-observer.cpp xml/composite-node-observer.h \
 	xml/element-node.h \
+	xml/helper-observer.cpp	\
+	xml/helper-observer.h	\
 	xml/node-observer.h \
 	xml/quote.cpp	\
 	xml/quote.h	\
diff --git a/src/xml/helper-observer.cpp b/src/xml/helper-observer.cpp
new file mode 100644
index 000000000..620a88d8c
--- /dev/null
+++ b/src/xml/helper-observer.cpp
@@ -0,0 +1,43 @@
+#include "helper-observer.h"
+
+namespace Inkscape {
+namespace XML {
+
+// Very simple observer that just emits a signal if anything happens to a node
+SignalObserver::SignalObserver()
+    : _oldsel(0)
+{}
+
+// Add this observer to the SPObject and remove it from any previous object
+void SignalObserver::set(SPObject* o)
+{
+    if(_oldsel && _oldsel->repr)
+        _oldsel->repr->removeObserver(*this);
+    if(o && o->repr)
+        o->repr->addObserver(*this);
+    _oldsel = o;
+}
+
+void SignalObserver::notifyChildAdded(XML::Node&, XML::Node&, XML::Node*)
+{ signal_changed()(); }
+
+void SignalObserver::notifyChildRemoved(XML::Node&, XML::Node&, XML::Node*)
+{ signal_changed()(); }
+
+void SignalObserver::notifyChildOrderChanged(XML::Node&, XML::Node&, XML::Node*, XML::Node*)
+{ signal_changed()(); }
+
+void SignalObserver::notifyContentChanged(XML::Node&, Util::ptr_shared<char>, Util::ptr_shared<char>)
+{}
+
+void SignalObserver::notifyAttributeChanged(XML::Node&, GQuark, Util::ptr_shared<char>, Util::ptr_shared<char>)
+{ signal_changed()(); }
+
+sigc::signal<void>& SignalObserver::signal_changed()
+{
+    return _signal_changed;
+}
+
+} //namespace XML
+} //namespace Inkscape
+
diff --git a/src/xml/helper-observer.h b/src/xml/helper-observer.h
new file mode 100644
index 000000000..d028d390b
--- /dev/null
+++ b/src/xml/helper-observer.h
@@ -0,0 +1,35 @@
+#ifndef __XML_HELPER_OBSERVER__
+#define __XML_HELPER_OBSERVER__
+
+#include "node-observer.h"
+#include "node.h"
+#include "../sp-object.h"
+//#include "../sp-object-repr.h"
+#include <sigc++/sigc++.h>
+
+namespace Inkscape {
+    namespace XML {
+        class Node;
+
+		// Very simple observer that just emits a signal if anything happens to a node
+		class SignalObserver : public NodeObserver
+		{
+		public:
+			SignalObserver();
+
+			// Add this observer to the SPObject and remove it from any previous object
+			void set(SPObject* o);
+			void notifyChildAdded(Node&, Node&, Node*);
+			void notifyChildRemoved(Node&, Node&, Node*);
+			void notifyChildOrderChanged(Node&, Node&, Node*, Node*);
+			void notifyContentChanged(Node&, Util::ptr_shared<char>, Util::ptr_shared<char>);
+			void notifyAttributeChanged(Node&, GQuark, Util::ptr_shared<char>, Util::ptr_shared<char>);
+			sigc::signal<void>& signal_changed();
+		private:
+			sigc::signal<void> _signal_changed;
+			SPObject* _oldsel;
+		};
+	}
+}
+
+#endif //#ifndef __XML_HELPER_OBSERVER__