psln/Inc/PslnPropertySubscriber.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 02 Feb 2010 01:00:49 +0200
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/*
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* Copyright (c) 2005-2006 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:  Property subscriber.
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*
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*/
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#ifndef C_PSLNPROPERTYSUBSCRIBER_H
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#define C_PSLNPROPERTYSUBSCRIBER_H
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#include    <e32base.h>
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#include    <e32property.h>
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/**
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*  Property subscriber wrapper class.
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*  Implements callback when property's value changes.
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*
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*  @since S60 v3.1
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*/
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class CPslnPropertySubscriber : public CActive
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    {
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    public:
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        /**
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        * C++ constructor.
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        *
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        * NOTE that callback method is NOT allowed to leave. If it leaves,
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        * subscription is not activated after the leave.
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        *
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        * @param aCallBack callback method to handle notification of a change
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        *        to client.
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        * @param aProperty property to subscribe.
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        */
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        CPslnPropertySubscriber( TCallBack aCallBack, RProperty& aProperty );
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        /**
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        * Destructor.
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        */
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        virtual ~CPslnPropertySubscriber();   
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        /**
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        * Subscribe property. 
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        * To stop subscription, just call Cancel.
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        */
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        void Subscribe();
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        /**
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        * From CActive. 
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        * Called when Active Object is ready.
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        */
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        void RunL();
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        /**
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        * From CActive. 
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        * Called when Active Object has been cancelled.
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        */
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        void DoCancel();
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    private:    // Data
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        /**
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        * Callback harness.
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        */
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        TCallBack   iCallBack;
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        /**
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        * Publish & Subsribe property.
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        */
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        RProperty&  iProperty;
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    };
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#endif      // C_PSLNPROPERTYSUBSCRIBER_H
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// End of File