1 files changed, 43 insertions, 0 deletions
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
+