/*

* Copyright (c) 2002 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:  Publish & Subscribe property change observer

*

*/

#ifndef VMDETDLGPROPERTYOBSERVER_H

#define VMDETDLGPROPERTYOBSERVER_H

//  INCLUDES

#include <e32base.h>        // CActive

#include <e32property.h>    // RProperty

// FORWARD DECLARATIONS

class CVmDetailsDialog;

// CLASS DECLARATION

/**

*  Implementation of the Publish & Subscribe property change observer

*

*  @lib

*  @since 2.6

*/

class CVmDetDlgPropertyObserver : public CActive

    {

    public:  // Constructors and destructor

        /**

        * Two-phased constructor.

        * @param aObserver Observer to be informed when observed property

        *                  changes

        */

        static CVmDetDlgPropertyObserver* NewL( CVmDetailsDialog& aDetDialog );

        /**

        * Destructor.

        */

        virtual ~CVmDetDlgPropertyObserver();

    public:     // New functions

        /**

        * Starts observing the given key for any changes

        * Notifies the observer when the property changes

        * @since 2.6

        * @param aCategory, Category of the observed property

        * @param aKey, Observed property

        */

        void ObservePropertyChangeL( TUid aCategory, TUint aKey );

    protected:  // Functions from base classes

        /**

        * From CActive

        */

        void RunL();

        /**

        * From CActive

        */

        void DoCancel();

        /**

        * From CActive

        */

        TInt RunError( TInt aError );

    private:

        /**

        * C++ default constructor.

        */

        CVmDetDlgPropertyObserver( CVmDetailsDialog& aDetDialog );

        /**

        * Symbian 2nd phase constructor..

        */

        void ConstructL();

    private:    // Data

        // Owns: Observed property

        RProperty iProperty;

        // Observer to be informed when property changes

        CVmDetailsDialog& iDetDialog;

        // Observed property

        TUint iKey;

    };

#endif      // VMDETDLGPROPERTYOBSERVER_H

// End of File