#ifndef SEEN_SP_TREF_REFERENCE_H

#define SEEN_SP_TREF_REFERENCE_H

#include <forward.h>

#include <uri-references.h>

#include <sigc++/sigc++.h>

#include "util/share.h"

#include "xml/node-observer.h"

#include "xml/subtree.h"

class SPTRefReference : public Inkscape::URIReference,

public Inkscape::XML::NodeObserver {

public:

SPTRefReference(SPObject *owner) : URIReference(owner), subtreeObserved(NULL) {

updateObserver();

}

virtual ~SPTRefReference() {

if (subtreeObserved) {

subtreeObserved->removeObserver(*this);

delete subtreeObserved;

}

}

SPItem *getObject() const {

return (SPItem *)URIReference::getObject();

}

void updateObserver();

/////////////////////////////////////////////////////////////////////

// Node Observer Functions

// -----------------------

virtual void notifyChildAdded(Inkscape::XML::Node &node, Inkscape::XML::Node &child, Inkscape::XML::Node *prev);

virtual void notifyChildRemoved(Inkscape::XML::Node &node, Inkscape::XML::Node &child, Inkscape::XML::Node *prev);

virtual void notifyChildOrderChanged(Inkscape::XML::Node &node, Inkscape::XML::Node &child,

Inkscape::XML::Node *old_prev, Inkscape::XML::Node *new_prev);

virtual void notifyContentChanged(Inkscape::XML::Node &node,

Inkscape::Util::ptr_shared<char> old_content,

Inkscape::Util::ptr_shared<char> new_content);

virtual void notifyAttributeChanged(Inkscape::XML::Node &node, GQuark name,

Inkscape::Util::ptr_shared<char> old_value,

Inkscape::Util::ptr_shared<char> new_value);

/////////////////////////////////////////////////////////////////////

protected:

virtual bool _acceptObject(SPObject * obj) const;

Inkscape::XML::Subtree *subtreeObserved;

};

#endif /* !SEEN_SP_TREF_REFERENCE_H */