instantmessagesalert/inc/cimalertpropertyobserver.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 02 Feb 2010 10:12:18 +0200
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/*
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* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:  Publish & Subscribe property change observer
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*
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*/
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#ifndef CIMALERTPROPERTYOBSERVER_H
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#define CIMALERTPROPERTYOBSERVER_H
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//  INCLUDES
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#include <e32base.h>        // CActive
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#include <e32property.h>    // RProperty
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#include "mimalertpropertynotificationobserver.h"
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// CLASS DECLARATION
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/**
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*  Implementation of the Publish & Subscribe property change observer
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*
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*  @lib MGXMediaFileAPI.lib
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*  @since 2.6
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*/
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NONSHARABLE_CLASS(CIMAlertPropertyObserver) : public CActive
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    {
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    public:  // Constructors and destructor
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        /**
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        * Two-phased constructor.
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        * @param aObserver Observer to be informed when observed 
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        *                  property changes
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        */
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        static CIMAlertPropertyObserver* NewL( 
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                MIMAlertPropertyNotificationObserver& aObserver );
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        /**
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        * Destructor.
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        */
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        virtual ~CIMAlertPropertyObserver();
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    public:     // New functions
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        /**
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        * Starts observing the given key for any changes
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        * Notifies the observer when the property changes
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        * @since 2.6
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        * @param aCategory, Category of the observed property
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        * @param aKey, Observed property
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        */
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        void ObservePropertyChangeL( TUid aCategory, TUint aKey );
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        /**
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        * Stops observing the key given with call ObserverPropertyChangeL
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        */
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        void CancelObserve( );
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        /**
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        * Gets the uid this observer is observing
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        * @return the category
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        */
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        TUid Category();
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        /**
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        * Gets the uid this observer is observing
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        * @return the key
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        */
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        TUint Key();
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    protected:  // Functions from base classes
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        /**
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        * From CActive
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        */
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        void RunL();
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        /**
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        * From CActive
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        */
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        void DoCancel();
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    private:
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        /**
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        * C++ default constructor.
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        */
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        CIMAlertPropertyObserver( MIMAlertPropertyNotificationObserver& aObserver );
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    private:    // Data
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        // Owns: Observed property
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        RProperty iProperty;
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        // Observer to be informed when property changes
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        MIMAlertPropertyNotificationObserver& iObserver;
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		// the category this observer is attached to
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		TUid iCategory;
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		// the key this observer is attached to
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		TUint iKey;
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    };
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#endif      // CIMALERTPROPERTYOBSERVER_H
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// End of File