/*

* Copyright (c) 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: CCH UI Call State Listener

*

*/

#ifndef C_CCHUICALLSTATELISTENER_H

#define C_CCHUICALLSTATELISTENER_H

#include <e32property.h>

#include <e32base.h>

class MCchUiCallStateObserver;

/**

*  Class for listening call state changes.

 *

 *  @code

 *    CCchUiCallStateListener listener =

 *        CCchUiCallStateListener::NewL( *this );

 *  @endcode

 *

 *  @lib cchuinotif.lib

 *  @since S60 v5.0

 */

NONSHARABLE_CLASS( CCchUiCallStateListener ) : public CActive

    {

public:

    /**

     * Two-phased constructor.

     * @param aObserver callback observer

     */

    static CCchUiCallStateListener* NewL( MCchUiCallStateObserver& aObserver );

    /**

     * Destructor.

     */

    virtual ~CCchUiCallStateListener();

protected:

// from base class CActive

    /**

     * From CActive

     * See base class.

     */

    void RunL();

    /**

     * From CActive

     * See base class.

     */

    void DoCancel();

private:

    CCchUiCallStateListener( MCchUiCallStateObserver& aObserver );

    /**

     * Handle state change.

     *

     * @since S60 v5.0

     */

    void HandleChange();

    /**

     * Start listening call state changes.

     *

     * @since S60 v5.0

     */

    void IssueRequest();

private: // data

    /*

     * Property handle used to get property value

     */

    RProperty iProperty;

    /**

     * Call state

     */

    TInt iCallState;

    /**

     * CCH UI call state observer for callbacks

     */

    MCchUiCallStateObserver& iObserver;

    // For unit testing

    friend class t_cchuicallstatelistener;

    };

#endif // C_CCHUICALLSTATELISTENER_H