/*

* Copyright (c) 2006-2009 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 HWRMFMTXFREQUENCYOBSERVER_H

#define HWRMFMTXFREQUENCYOBSERVER_H

//  INCLUDES

#include <e32base.h>

#include <cenrepnotifyhandler.h>

#include <centralrepository.h>

// FORWARD DECLARATIONS

class MHWRMFmTxObserver;

// CLASS DECLARATION

/**

*  This class observes the FM Tx frequency

*

*/

NONSHARABLE_CLASS(CHWRMFmTxFrequencyObserver): public CBase,

                                   public MCenRepNotifyHandlerCallback

    {

    public: // Constructors and Destructor

        /**

        * Two-phased constructor.

        */

        static CHWRMFmTxFrequencyObserver* NewL(MHWRMFmTxObserver* aCallback);

        /**

        * Destructor.

        */

        virtual ~CHWRMFmTxFrequencyObserver();

    public: // New functions

        /**

        * This method retrieves the current FM Tx state. 

        *

        * @return TInt indicating the current FM Tx frequency.

        */

        TInt Frequency() const;    

        /**

        * This method retrieves the minimum FM Tx frequency

        *

        * @return TInt The lower boundary of the FM range (kHz)

        */

        TInt MinFrequency() const; 

        /**

        * This method retrieves the maximum FM Tx frequency

        *

        * @return TInt The upper boundary of the FM range (kHz)

        */

        TInt MaxFrequency() const; 

        /**

        * This method retrieves the FM Tx frequency step size

        *

        * @return TInt The step size (kHz) 

        */

        TInt StepSize() const; 

        /**

        * This method queries whether the frequency range has been updated.

        * Initially CenRep does not contain valid frequency range settings.

        *

        * @return TBool ETrue if frequency range has been updated.

        */

        TBool FrequencyRangeUpdated() const;

    public: // Functions from base classes

        // From MCenRepNotifyHandlerCallback

        void HandleNotifyInt(TUint32 aId, TInt aNewValue);

        void HandleNotifyError(TUint32 aId, TInt error, CCenRepNotifyHandler* aHandler);

    private:

        /**

        * C++ default constructor.

        */

        CHWRMFmTxFrequencyObserver();

        /**

        * By default Symbian 2nd phase constructor is private.

        */

        void ConstructL(MHWRMFmTxObserver*  aCallback);        

    private:

        CRepository*          iRepository;          // Cenrep client

        // Cenrep notifications

        CCenRepNotifyHandler* iFreqNotify;

        CCenRepNotifyHandler* iMinFreqNotify;       

        CCenRepNotifyHandler* iMaxFreqNotify;

        CCenRepNotifyHandler* iStepSizeNotify;

        MHWRMFmTxObserver*    iCallback;            // Callback object for passing FM Tx frequency changes. Not owned

        TInt                  iFrequency;           // Current FM Tx frequency

        // FM frequency range

        TInt iMinFrequency;

        TInt iMaxFrequency;

        TInt iStepSize;

    };

#endif  // HWRMFMTXFREQUENCYOBSERVER_H

// End of File