mirror of
https://invent.kde.org/graphics/okular
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77 lines
2.8 KiB
C++
77 lines
2.8 KiB
C++
/***************************************************************************
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* Copyright (C) 2005 by Enrico Ros <eros.kde@email.it> *
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* Copyright (C) 2005 by Albert Astals Cid <tsdgeos@terra.es> *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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***************************************************************************/
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#ifndef _KPDF_DOCUMENTOBSERVER_H_
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#define _KPDF_DOCUMENTOBSERVER_H_
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#include <qvector.h>
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#include <qrect.h>
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/** IDs for observers. Globally defined here. **/
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#define PRESENTATION_ID 1
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#define PART_ID 2
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#define PAGEVIEW_ID 3
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#define THUMBNAILS_ID 4
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#define TOC_ID 5
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#define MINIBAR_ID 6
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#define REVIEWS_ID 7
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// the biggest ide, useful for ignoring wrong id request
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#define MAX_OBSERVER_ID 8
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/** PRIORITIES for requests. Globally defined here. **/
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#define PAGEVIEW_PRIO 1
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#define PAGEVIEW_PRELOAD_PRIO 3
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#define THUMBNAILS_PRIO 2
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#define THUMBNAILS_PRELOAD_PRIO 4
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#define PRESENTATION_PRIO 0
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class KPDFPage;
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/**
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* @short Base class for objects being notified when something changes.
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*
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* Inherit this class and call KPDFDocument->addObserver( yourClass ) to get
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* notified of asyncronous events (new pixmap generated, or changed, etc..).
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*/
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class DocumentObserver
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{
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public:
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virtual ~DocumentObserver() {};
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// you must give each observer a unique ID (used for notifications)
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virtual uint observerId() const = 0;
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// commands from the Document to all observers
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enum ChangedFlags { Pixmap = 1, Bookmark = 2, Highlights = 4, Annotations = 8 };
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enum NotifyType { Setup = 1, Viewport = 2, Page = 4, Contents = 8 };
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virtual void notifySetup( const QVector< KPDFPage * > & /*pages*/, bool /*documentChanged*/ ) {};
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virtual void notifyViewportChanged( bool /*smoothMove*/ ) {};
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virtual void notifyPageChanged( int /*pageNumber*/, int /*changedFlags*/ ) {};
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virtual void notifyContentsCleared( int /*changedFlags*/ ) {};
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// queries to observers
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virtual bool canUnloadPixmap( int /*pageNum*/ ) { return true; }
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};
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struct NotifyRequest
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{
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DocumentObserver::NotifyType type;
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bool toggle;
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int page;
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int flags;
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NotifyRequest (DocumentObserver::NotifyType t, bool to=false)
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: type(t), toggle(to) { ; };
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NotifyRequest (DocumentObserver::NotifyType t, int p, int f)
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: type(t), page(p), flags (f) { ; };
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NotifyRequest (DocumentObserver::NotifyType t, int p)
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: type(t), page(p) { ; };
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};
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#endif
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