/*

* Copyright (c) 2007-2008 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:   Activates the notification of gsm signal level strengths

*

*/

#ifndef VCCGSMNOTIFICATIONS_H_

#define VCCGSMNOTIFICATIONS_H_

#include <etelmm.h> 

/**

 *  Observer which will receive notification about gsm signal level changes

 *

 *  @lib vcchotrigger.lib

 *  @since S60 3.2

 */

class MVccGsmNotifications

    {

    public:

        /**

        * Constructor.

        *

        * @since S60 3.2

        */

        virtual void GsmStrengthChanged( TInt32 aStrength ) = 0;

    };

/**

 *  Clas which starts and stops notification of the gsm signal level 

 *

 *  @lib vcchotrigger.lib

 *  @since S60 3.2

 */

class CVccGsmNotifications : public CActive

    {

    public:

        /**

        * Two-phased constructor.

        *

        * @param aPhone RMobilePhone

        */

        static CVccGsmNotifications* NewL( RMobilePhone& aPhone );

        /**

        * Destructor.

        */

        ~CVccGsmNotifications();

        /**

         * Activates gsm signal level notification

         *

         * @since S60 3.2

         * @param aObserver observer which will receive notification

         * @param aLow value for low signal level

         * @param aHigh value for high signal level

         *

         */

        void ActivateNotifications( MVccGsmNotifications* aObserver, TInt32 aLow, TInt32 aHigh );

        /**

         * Cancels gsm signal level notification

         *

         * @since S60 3.2

         */

        void CancelNotifications();

    protected:

        /**

         * Symbian second-phase constructor

         */

        void ConstructL();

        /**

         * C++ constructor

         */

        CVccGsmNotifications( RMobilePhone& aPhone );

    private: // From CActive

        /**

         * @see CActive::RunL()

         */

        void RunL();

        /**

         * @see CActive::Cancel()

         */

        void DoCancel();

    private:

        /**

        * RMobilePhone handle

        * Not own

        */

        RMobilePhone& iPhone;

        /**

         * Observer

         * Not own

         */

        MVccGsmNotifications* iObserver;

        /**

        * Gsm signal strength value

        */

        TInt32 iStrength;

        /**

        * Gsm signal bar value

        */

        TInt8 iBar;

        /**

        * Gsm signal strength value for low signal level

        */

        TInt32 iLow;

        /**

        * Gsm signal strength value for high signal level

        */

        TInt32 iHigh;

    };

#endif // VCCGSMNOTIFICATIONS_H_