/*

* Copyright (c) 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:  Header file for MTelDMCallStateObserver class.

*

*/

#ifndef CTELDMCALLSTATELISTENER_H

#define CTELDMCALLSTATELISTENER_H

//  INCLUDES

#include    <e32property.h>

#include    <e32base.h>

// FORWARD DECLARATIONS

// CLASS DECLARATION

class MTelDMCallStateObserver;

/**

*  Call state listener. Listening TelephonyCallState PS key. 

*

*  @since 3.1

*/

NONSHARABLE_CLASS( CTelDMCallStateListener ) : public CActive

    {

    public: // Constructors and destructors.

        /**

        * Two-phased constructor.

        */ 

        static CTelDMCallStateListener* NewL();

        /**

        * Destructor.

        */

        virtual ~CTelDMCallStateListener();

    public:

        void AddObserverL( MTelDMCallStateObserver& aCallStateObserver );

    private: // from CActive

        /**

        * @see CActive::RunL.

        */

        void RunL();

        /**

        * @see CActive::DoCancel.

        */

        void DoCancel();

    private:

        /**

        * Handle notification request

        */      

        void HandleChange();

        /**

        * Start notification.

        */

        void IssueRequest();

        /**

        * Constructor.

        */

        CTelDMCallStateListener();

        /**

        * Symbian OS constructor.

        */

        void ConstructL();

    private:

        // Owned Publish & Subscribe instance.

        RProperty iProperty;

        // Call state

        TInt iCallState;

        // Call State Change Observer array.

        RPointerArray< MTelDMCallStateObserver > iObserverArray;

    };

#endif      // CTELDMCALLSTATELISTENER_H  

// End of File