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/* ============================================================
*
* This file is a part of digiKam project
* http://www.digikam.org
*
* Date : 2006-01-03
* Description : DImgLoader observer interface
*
* Copyright (C) 2006-2007 by Marcel Wiesweg <[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, 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.
*
* ============================================================ */
#ifndef DIMGLOADEROBSERVER_H
#define DIMGLOADEROBSERVER_H
// Local includes.
#include "digikam_export.h"
namespace Digikam
{
class DImg;
class DIGIKAM_EXPORT DImgLoaderObserver
{
public:
// posts progress information about image IO
virtual void progressInfo(const DImg *, float /*progress*/)
{};
// queries whether the image IO operation shall be continued
virtual bool continueQuery(const DImg *)
{ return true; };
// Return a relative value which determines the granularity, the frequency
// with which the DImgLoaderObserver is checked and progress is posted.
// Standard is 1.0. Values < 1 mean less granularity (fewer checks),
// values > 1 mean higher granularity (more checks).
virtual float granularity()
{ return 1.0; };
// This is a hack needed to prevent hanging when a TDEProcess-based loader (raw loader)
// is waiting for the process to finish, but the main thread is waiting
// for the thread to finish and no TDEProcess events are delivered.
// Remove when porting to TQt4.
virtual bool isShuttingDown()
{ return false; }
virtual ~DImgLoaderObserver(){};
};
} // namespace Digikam
#endif // DIMGLOADEROBSERVER_H
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