/*

* Copyright (c) 2002-2005 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:  Observes and updates to PS the network signal strength.

*

*/

#ifndef CSAESIGNALSTRENGTHOBSERVER_H

#define CSAESIGNALSTRENGTHOBSERVER_H

//  INCLUDES

#include <etelmm.h>

// CONSTANTS

// MACROS

// DATA TYPES

// FUNCTION PROTOTYPES

// FORWARD DECLARATIONS

// CLASS DECLARATION

class CSaePubSubNotifier;

/**

*  Observes signal strengths from ETel

*/

NONSHARABLE_CLASS( CSaeSignalStrengthObserver ) : public CActive

    {

    public:  // Constructors and destructor

        /**

        * Two-phased constructor.

        */

        static CSaeSignalStrengthObserver* NewL( CSaePubSubNotifier* aNotifier );

        /**

        * Destructor.

        */

        virtual ~CSaeSignalStrengthObserver();

    public: // New functions

        /**

        * Start listening to signal strength changes. 

        * Update current status with synchronous getter operation and request

        * notifications about state changes.

        * @return void

        */

        void Receive();

    protected:  // Functions from base classes

         /**

        * From CActive Cancels the asyncronous request

        * @since 

        * @return void

        */

        void DoCancel();

        /**

        * From CActive Handles the the event that has arrived from ETel.

        * @since 

        * @return void

        */

        void RunL();

    private:

        /**

        * C++ default constructor.

        */

        CSaeSignalStrengthObserver( CSaePubSubNotifier* aNotifier );

        /**

        * By default Symbian 2nd phase constructor is private.

        */

        void ConstructL();

        /**

        * Issue notification request to RMobilePhone.

        */

        void IssueRequest();

    public:     // Data

    protected:  // Data

    private:    // Data

        // Session with Etel server

        RTelServer iEtelServer;

        // RMobilePhone for requesting the signal strength state

        RMobilePhone iMobilePhone;

        // Notifier to PubSub

        CSaePubSubNotifier* iNotifier;

        // The signal strength in dBm

        TInt32 iSignalStrength;

        // The number of signal strength bars

        TInt8 iBar;

        // The number of last notification signal strength bars

        TInt8 iPreviousBar;

    };

#endif      // CSAESIGNALSTRENGTHOBSERVER_H   

// End of File