/*

* Copyright (c) 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:  Subscribes properties from P&S

 *

*/

#ifndef MMPROPERTYSUBSCRIBER_H

#define MMPROPERTYSUBSCRIBER_H

#include <e32base.h>	// For CActive, link against: euser.lib

#include <e32property.h>

// Observer for property change. Currently integer value supported

class MMmPropertyChangeObserver

    {

public:    

    virtual void PropertyChangedL(TInt aValue)=0;

    };

/**

*  Subcribes property from P&S and listen property changes

* 

*  @lib xn3layoutengine.lib

*  @since Series 60 5.0

*/

NONSHARABLE_CLASS( CMmPropertySubscriber ) : public CActive

    {

public:

    // Cancel and destroy

    ~CMmPropertySubscriber();

    /**

    * Two-phased constructor.

    * @param aUid P&S property category

    * @param aKey P&S property key

    * @param aObserver Given property change observer

    */

    static CMmPropertySubscriber* NewL(

            const TUid aUid, 

            const TUint32 aKey,

            MMmPropertyChangeObserver& aObserver);

    /**

    * Two-phased constructor.

    * @param aUid P&S property category

    * @param aKey P&S property key

    * @param aObserver Given property change observer

    */

    static CMmPropertySubscriber* NewLC(

            const TUid aUid, 

            const TUint32 aKey,

            MMmPropertyChangeObserver& aObserver);

private:

    // C++ constructor

    CMmPropertySubscriber(MMmPropertyChangeObserver& aObserver);

    // Second-phase constructor

    void ConstructL(const TUid aUid,const TUint32 aKey);

private: // From CActive

    // Handle completion

    void RunL();

    // How to cancel me

    void DoCancel();

private:

    //Observer for property changes

    MMmPropertyChangeObserver& iPropertyChangeObserver;

    // Property to listen

    RProperty iProperty;

    };

#endif // MMPROPERTYSUBSCRIBER_H