/*

* Copyright (c) 2005-2006 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 which implements handling Side Volume Key events (SVK).

*  This class implements methods of MRemConCoreApiTargetObserver

*

*/

#ifndef MMSSVKEVENTS_H

#define MMSSVKEVENTS_H

// INCLUDES

#include <remconcoreapitargetobserver.h>

// FORWARD DECLARATIONS

// CONSTANTS

// CLASS DECLARATION

class CRemConInterfaceSelector;

class CRemConCoreApiTarget;

class MMmsSvkEventsObserver

    {

public:

    /**

    * Called when volume level should be changed.

    * @param aVolumeChange: +1 change volume up

    *                       -1 change volume down

    */

    virtual void MmsSvkChangeVolumeL( TInt aVolumeChange ) = 0;

    };

class CMmsSvkEvents : public CBase,

						public MRemConCoreApiTargetObserver

    {

    public: // Constructors and destructor

        /**

        * Symbian constructor

        * @param aObserver observer to implement callback functions

        */

        static CMmsSvkEvents* NewL( MMmsSvkEventsObserver& aObserver );

        /**

        * Destructor.

        */

        virtual ~CMmsSvkEvents();

    protected: // New functions

        /**

        * Default constructor.

        */

        CMmsSvkEvents( MMmsSvkEventsObserver& aObserver );

        /**

        * EPOC constructor.

        */

        void ConstructL();

    	// From MRemConCoreApiTargetObserver

    	void MrccatoCommand(TRemConCoreApiOperationId aOperationId, 

    	 					TRemConCoreApiButtonAction aButtonAct);

    private:

        /**

        * Calls respective observer function

        */

        void DoChangeVolume( );

        /**

        * ChangeVolume is the callback function called from change volume timer.

        */

        static TInt ChangeVolume(TAny* aThis);

	private:

	    MMmsSvkEventsObserver&      iObserver;

		CRemConInterfaceSelector*   iInterfaceSelector;

		CRemConCoreApiTarget*       iCoreTarget;

		CPeriodic*                  iVolumeTimer;

        /// indicates size of volume level change

        TInt                        iChange;

    };

#endif

// End of File