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/*
* Copyright (c) 2009 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:
*
*/
#ifndef CNTIMAGESUTILITY_H_
#define CNTIMAGESUTILITY_H_
#include <e32base.h>
class CImageRescaler;
/*
* Interface for listening to the operations of contacts image utility class
*/
class MContactImageUtilityObserver
{
public:
/**
* Call back function used to inform the client of completion or error status
*
* @param aDestPath A valid path to the new image, or empty.
* @param aError KErrNone The operation was successful
* KErrNotFound The images directory does not exist
* KErrCancel The operation was cancelled while going on
* KErrGeneral Any other error while decoding
* KErrArgument Source image does not exist
* Any other system wide errors
*/
virtual void UtilityOperationComplete(const TPath& aDestPath, TInt aError) = 0;
};
/**
* This is a utility class used for operations on the private images folder that is used
* to store scaled images assigned to contacts on the contacts database.
*
* When user assigns an image to a contact, the contacts database needs to take ownership
* of the image. Because of this, a copy of the image is stored in an separate directory.
* If need be, the image is rescaled to a smaller size before being copied. Users of CContactDatabase
* API can scale down and store the images in this directory using this utility class. This will avoid
* any rescaling when saving the contact increasing performance of the save operation.
*/
NONSHARABLE_CLASS(CContactImagesUtility) : public CActive
{
public:
/**
* Factory method to create a CContactImagesUtility object
*/
IMPORT_C static CContactImagesUtility* NewL();
/*
* Desctuctor
*/
IMPORT_C ~CContactImagesUtility();
/**
* Scales down the image, if need be, and store it in the contact images directory
*
* @param aObserver Observer to the events of image processing
*
* @param aSrcPath A valid path to the source image.
*
* @pre aObserver should not be NULL
*/
IMPORT_C void ScaleAndStoreImage(MContactImageUtilityObserver* aObserver, const TDesC& aSrcPath);
/**
* Ensures that the image is deleted from the filesystem, if it is owned by
* contacts (is in the contacts images directory).
*
* @param aImagePath File path to the image file.
*/
IMPORT_C void EnsureImageRemoved(const TDesC& aImagePath);
private: // CActive
void DoCancel();
void RunL();
TInt RunError(TInt aError);
private:
CContactImagesUtility();
void ConstructL();
private:
CImageRescaler* iRescaler;
MContactImageUtilityObserver* iObserver;
};
#endif /* CNTIMAGESUTILITY_H_ */
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