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/***************************************************************************
* Copyright (C) 2005 by Enrico Ros <eros.kde@email.it> *
* Copyright (C) 2005 by Albert Astals Cid <tsdgeos@terra.es> *
* *
* 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
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