/*

* 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:  The header file of unlocking event observer

*

*/

#ifndef     RLLOCKOBSERVER_H

#define     RLLOCKOBSERVER_H

#include    <e32base.h>

#include    <e32property.h>

// CONSTANTS 

// MACROS 

// FORWARD DECLARATIONS 

class MRLLockObserverHandler;

// LOCAL FUNCTION PROTOTYPES 

// MEMBER FUNCTIONS 

// CLASS DECLARATION

/**

* Observe the unlocking event

*

* @since S60 3.2

*/

class CRLLockObserver: public CActive

    {

    public:

       /**

        * Two-Phased constructor

        *

        * @since S60 3.2

        * @param aHandler Client implemented observer handler that will be

        *                 called when phone are unlocked. 

        * @return

        */

        static CRLLockObserver* NewL( MRLLockObserverHandler* aHandler );

        ~CRLLockObserver();    

    private:

        /**

        * Starts asynchronic listening 

        * KCoreAppUIsAutolockStatus/

        * KPSUidAutolockStatusValue event

        *

        * @Since S60 3.2

        * @return KErrNone: if no errors

        *         KErrInUse: if already listening

        */

        TInt Start();            

    private: 

        CRLLockObserver( MRLLockObserverHandler* aHandler );

        void ConstructL();

    private: // from CActive

        void RunL();

        void DoCancel();

    private: // data

        RProperty                iProperty;

        MRLLockObserverHandler*  iHandler; //not owned

    };

// CLASS DECLARATION

/**

* Abstract interface class declares a callback function for 

* remotelock observer to call when the phone is unlocked. User

* derives his class from this and implements HandleUnlockEvent().

*

* @since S60 3.2

*/

class MRLLockObserverHandler 

    {

    public:

    /**

    * The function is called when the phone is unlocked.

    *

    * @since S60 3.2

    */

    virtual void HandleUnlockEvent() = 0;

    };

#endif //RLLOCKOBSERVER_H

// End of file