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diff --git a/src/gvcore/documentimpl.h b/src/gvcore/documentimpl.h
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+// vim: set tabstop=4 shiftwidth=4 noexpandtab
+/*
+Gwenview - A simple image viewer for KDE
+Copyright 2000-2004 Aurélien Gâteau
+ 
+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.
+ 
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+ 
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ 
+*/
+#ifndef DOCUMENTIMPL_H
+#define DOCUMENTIMPL_H
+
+// Qt
+#include <qobject.h>
+#include <qrect.h>
+
+// Local
+#include "document.h"
+#include "imageutils/orientation.h"
+namespace Gwenview {
+
+
+class DocumentImpl : public QObject {
+Q_OBJECT
+public:
+	DocumentImpl(Document* document);
+	virtual ~DocumentImpl();
+	/**
+	 * This method is called by Document::switchToImpl after it has connect
+	 * signals to the object
+	 */
+	virtual void init();
+	
+	void switchToImpl(DocumentImpl*);
+	void setImage(QImage);
+	void setMimeType(const QString&);
+	void setImageFormat(const QCString&);
+	void setFileSize(int) const;
+
+	/**
+	 * Convenience method to emit rectUpdated with the whole image rect
+	 */
+	void emitImageRectUpdated();
+
+	virtual QString aperture() const;
+	virtual QString exposureTime() const;
+	virtual QString iso() const;
+	virtual QString focalLength() const;
+
+	virtual QString comment() const;
+	virtual Document::CommentState commentState() const;
+	virtual void setComment(const QString&);
+	virtual int duration() const;
+	
+	virtual void transform(ImageUtils::Orientation);
+	virtual QString save(const KURL&, const QCString& format) const;
+
+	virtual MimeTypeUtils::Kind urlKind() const=0;
+
+	virtual bool canBeSaved() const=0;
+
+
+signals:
+	void finished(bool success);
+	void sizeUpdated();
+	void rectUpdated(const QRect&);
+	
+protected:
+	Document* mDocument;
+};
+
+class DocumentEmptyImpl : public DocumentImpl {
+public:
+	DocumentEmptyImpl(Document* document)
+	: DocumentImpl(document) {
+		setImage(QImage());
+		setImageFormat(0);
+		setMimeType("application/x-zerosize");
+	}
+
+	MimeTypeUtils::Kind urlKind() const {
+		return MimeTypeUtils::KIND_UNKNOWN;
+	}
+
+	bool canBeSaved() const {
+		return false;
+	}
+};
+
+} // namespace
+#endif /* DOCUMENTIMPL_H */
+