idlehomescreen/xmluicontroller/inc/psobserver.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Thu, 07 Jan 2010 12:39:41 +0200
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/*
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* Copyright (c) 2005-2008 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:  Observer for changes in Publish & Subscribe keys
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*
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*/
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#ifndef C_PSOBSERVER_H
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#define C_PSOBSERVER_H
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#include <e32property.h>
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#include <e32base.h>
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namespace AiXmlUiController
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{
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class MPSCallback;
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/**
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*  @ingroup group_xmluicontroller
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* 
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*  Observer for changes in Publish & Subcribe keys
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*
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*  @lib AiXmlUiMain
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*/
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class CPSObserver : public CActive
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    {
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	public:  // Constructors and destructor
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	    static CPSObserver* NewL( MPSCallback& aCallback, TUid aCategory, TInt aKey );
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	    virtual ~CPSObserver();
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	    /**
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	     * Returns the current value of the monitored
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	     * P&S key. 
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	     * 
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	     * @param aValue Value is placed here
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	     * 
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	     * @return KErrNone if succesfull
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	     */
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	    TInt GetValue( TInt &aValue ) const;
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	private:
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		CPSObserver( MPSCallback& aCallback, TUid aCategory, TInt aKey );
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		void ConstructL();
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	private:	// from CActive
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		void RunL();
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		void DoCancel();
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		TInt RunError();	
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	private:    // Data
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	    RProperty iProperty;
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	    MPSCallback& iCallback;
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	    TUid iCategory;
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	    TInt iKey;
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   };
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} // namespace AiXmlUiController
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#endif      // C_PSOBSERVER_H 
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//  End of File