/*
* Copyright (c) 2002 Nokia Corporation and/or its subsidiary(-ies).
* All rights reserved.
* This component and the accompanying materials are made available
* under the terms of "Eclipse Public License v1.0"
* which accompanies this distribution, and is available
* at the URL "http://www.eclipse.org/legal/epl-v10.html".
*
* Initial Contributors:
* Nokia Corporation - initial contribution.
*
* Contributors:
*
* Description:
* Class CPbkThumbnailManager implementation classes.
*
*/
#ifndef __CPbkThumbnailReaderBase_H__
#define __CPbkThumbnailReaderBase_H__
// INCLUDES
#include <e32base.h>
#include "CPbkThumbnailManagerImpl.h"
#include "MPbkImageReaderObserver.h"
// FORWARD DECLARATIONS
class MPbkThumbnailGetObserver;
class CPbkImageReader;
class MPbkThumbnailGetImageObserver;
class MPbkImageData;
class CPbkImageDataWithInfo;
class TPbkImageLoadParameters;
// CLASS DECLARATION
/**
* Implementation base class for thumbnail readers.
*/
NONSHARABLE_CLASS(CPbkThumbnailReaderBase) :
public CBase,
public MPbkThumbnailReader,
private MPbkImageReaderObserver
{
protected: // interface
/**
* Constructor.
* @param aObserver thumbnail get observer
*/
CPbkThumbnailReaderBase(MPbkThumbnailGetObserver& aObserver);
/**
* Second phase constructor.
*/
void ConstructL();
/**
* Destructor. Cancels any previously executing read operation and
* destroys this object.
*/
~CPbkThumbnailReaderBase();
/**
* Returns the image reader.
*/
CPbkImageReader& ImageReader()
{
return *iImageReader;
}
public: // from MPbkThumbnailReader
void CancelRead();
private: // from MPbkImageReaderObserver
void ImageReadComplete(CPbkImageReader& aReader, CFbsBitmap* aBitmap);
void ImageReadFailed(CPbkImageReader& aReader, TInt aError);
private: // data members
/// Ref: observer
MPbkThumbnailGetObserver& iObserver;
/// Own: image reader
CPbkImageReader* iImageReader;
};
/**
* Implementation base class for thumbnail image readers.
*/
NONSHARABLE_CLASS(CPbkThumbnailImageReaderBase) :
public CBase,
public MPbkThumbnailReader,
private MPbkImageReaderObserver
{
protected: // Interface
/**
* Constructor.
* @param aObserver observer to notify about progress of this
* operation
*/
CPbkThumbnailImageReaderBase
(MPbkThumbnailGetImageObserver& aObserver);
/**
* Second phase constructor.
*/
void ConstructL();
/**
* Destructor. Cancels any previously executing read operation and
* destroys this object.
*/
~CPbkThumbnailImageReaderBase();
/**
* Returns the image reader.
*/
CPbkImageReader& ImageReader()
{
return *iImageReader;
}
private: // Abstract interface for derived classes
/**
* Starts image reader.
*
* @param aParameters Optional parameters for resulting thumbnail
*/
virtual void DoStartReadL
(const TPbkImageLoadParameters* aParameters = NULL) =0;
/**
* Creates and returns an image data object.
*/
virtual MPbkImageData* CreateImageDataLC() =0;
public: // From MPbkThumbnailReader
void StartReadL(const TPbkImageLoadParameters* aParameters = NULL);
void CancelRead();
private: // From MPbkImageReaderObserver
void ImageReadComplete
(CPbkImageReader& aReader, CFbsBitmap* aBitmap);
void ImageReadFailed(CPbkImageReader& aReader, TInt aError);
void ImageOpenComplete(CPbkImageReader& aReader);
private: // Implementation
void HandleImageOpenCompleteL();
private: // data members
/// Ref: observer
MPbkThumbnailGetImageObserver& iObserver;
/// Own: image reader
CPbkImageReader* iImageReader;
/// Own: image data
CPbkImageDataWithInfo* iImageData;
};
#endif // __CPbkThumbnailReaderBase_H__
// End of File