/*

* Copyright (c) 2008 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:  Videoteleng Camera Preferences extension Observer

*

*/

#ifndef MVTENGCAMERAPREFERENCESOBSERVER_H

#define MVTENGCAMERAPREFERENCESOBSERVER_H

//	INCLUDES

#include <mvtengcamerapreferences.h>

/**

*  Camera preferences extension observer.

*

*  @lib videoteleng.lib

*  @since S60 v5.0

*/

class MVtEngCameraPreferencesObserver

    {

public:

    /**

    * Called when observer is attached to camera preferences instance.

    * @param aCamPrefs Reference to camera preferences instance this observer

    * was attached to.

    */

    virtual void Attach( MVtEngCameraPreferences& aCamPrefs ) = 0;

    /**

    * Called when color tone is updated.

    * @param aColorTone New color tone value.

    */

    virtual void ColorToneUpdated(

        MVtEngCameraPreferences::TColorTone aColorTone ) = 0;

    /**

    * Called when white balance is updated.

    * @param aWhiteBalance New white balance value.

    */

    virtual void WhiteBalanceUpdated(

        MVtEngCameraPreferences::TWhiteBalance aWhiteBalance ) = 0;

    /**

    * Called when brightness is updated.

    * @param aBrightness New brightness value set.

    */

    virtual void BrightnessUpdated( TInt aBrightness ) = 0;

    /**

    * Called when contrast is updated.

    * @param aContrast New contrast value set.

    */

    virtual void ContrastUpdated( TInt aContrast ) = 0;

    /**

    * Called when observer is detached from camera preferences instance.

    * @param aCamPrefs Reference to camera preferences instance this observer

    * was detached from.

    */

    virtual void Detach( MVtEngCameraPreferences& aCamPrefs ) = 0;

    };

#endif // MVTENGCAMERAPREFERENCESOBSERVER_H