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68 lines
2.0 KiB
68 lines
2.0 KiB
/* ============================================================
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*
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* This file is a part of digiKam project
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* http://www.digikam.org
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*
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* Date : 2006-01-03
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* Description : DImgLoader observer interface
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*
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* Copyright (C) 2006-2007 by Marcel Wiesweg <marcel.wiesweg@gmx.de>
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*
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* This program is free software; you can redistribute it
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* and/or modify it under the terms of the GNU General
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* Public License as published by the Free Software Foundation;
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* either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* ============================================================ */
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#ifndef DIMGLOADEROBSERVER_H
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#define DIMGLOADEROBSERVER_H
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// Local includes.
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#include "digikam_export.h"
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namespace Digikam
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{
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class DImg;
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class DIGIKAM_EXPORT DImgLoaderObserver
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{
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public:
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// posts progress information about image IO
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virtual void progressInfo(const DImg *, float /*progress*/)
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{};
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// queries whether the image IO operation shall be continued
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virtual bool continueQuery(const DImg *)
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{ return true; };
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// Return a relative value which determines the granularity, the frequency
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// with which the DImgLoaderObserver is checked and progress is posted.
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// Standard is 1.0. Values < 1 mean less granularity (fewer checks),
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// values > 1 mean higher granularity (more checks).
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virtual float granularity()
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{ return 1.0; };
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// This is a hack needed to prevent hanging when a KProcess-based loader (raw loader)
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// is waiting for the process to finish, but the main thread is waiting
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// for the thread to finish and no KProcess events are delivered.
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// Remove when porting to TQt4.
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virtual bool isShuttingDown()
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{ return false; }
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virtual ~DImgLoaderObserver(){};
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};
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} // namespace Digikam
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#endif // DIMGLOADEROBSERVER_H
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