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diff --git a/kpdf/core/observer.h b/kpdf/core/observer.h
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+/***************************************************************************
+ *   Copyright (C) 2005 by Enrico Ros <[email protected]>                  *
+ *   Copyright (C) 2005 by Albert Astals Cid <[email protected]>            *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ ***************************************************************************/
+
+#ifndef _KPDF_DOCUMENTOBSERVER_H_
+#define _KPDF_DOCUMENTOBSERVER_H_
+
+#include <qvaluevector.h>
+#include <qrect.h>
+
+/** IDs for observers. Globally defined here. **/
+#define PRESENTATION_ID 1
+#define PART_ID 2
+#define PAGEVIEW_ID 3
+#define THUMBNAILS_ID 4
+#define TOC_ID 5
+#define MINIBAR_ID 6
+
+/** PRIORITIES for requests. Globally defined here. **/
+#define PAGEVIEW_PRIO 1
+#define PAGEVIEW_PRELOAD_PRIO 4
+#define THUMBNAILS_PRIO 2
+#define THUMBNAILS_PRELOAD_PRIO 5
+#define PRESENTATION_PRIO 0
+#define PRESENTATION_PRELOAD_PRIO 3
+
+class KPDFPage;
+
+/**
+ * @short Base class for objects being notified when something changes.
+ *
+ * Inherit this class and call KPDFDocument->addObserver( yourClass ) to get
+ * notified of asyncronous events (new pixmap generated, or changed, etc..).
+ */
+class DocumentObserver
+{
+    public:
+        // you must give each observer a unique ID (used for notifications)
+        virtual uint observerId() const = 0;
+
+        // commands from the Document to all observers
+        enum ChangedFlags { Pixmap = 1, Bookmark = 2, Highlights = 4 };
+        virtual void notifySetup( const QValueVector< KPDFPage * > & /*pages*/, bool /*documentChanged*/ ) {};
+        virtual void notifyViewportChanged( bool /*smoothMove*/ ) {};
+        virtual void notifyPageChanged( int /*pageNumber*/, int /*changedFlags*/ ) {};
+        virtual void notifyContentsCleared( int /*changedFlags*/ ) {};
+
+        // queries to observers
+        virtual bool canUnloadPixmap( int /*pageNum*/ ) { return true; }
+};
+
+#endif