/*

* Copyright (c) 2005-2008 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:  Observer for changes in Publish & Subscribe keys

*

*/

#ifndef C_PSOBSERVER_H

#define C_PSOBSERVER_H

#include <e32property.h>

#include <e32base.h>

namespace AiXmlUiController

{

class MPSCallback;

/**

*  @ingroup group_xmluicontroller

* 

*  Observer for changes in Publish & Subcribe keys

*

*  @lib AiXmlUiMain

*/

class CPSObserver : public CActive

    {

	public:  // Constructors and destructor

	    static CPSObserver* NewL( MPSCallback& aCallback, TUid aCategory, TInt aKey );

	    virtual ~CPSObserver();

	    /**

	     * Returns the current value of the monitored

	     * P&S key. 

	     * 

	     * @param aValue Value is placed here

	     * 

	     * @return KErrNone if succesfull

	     */

	    TInt GetValue( TInt &aValue ) const;

	private:

		CPSObserver( MPSCallback& aCallback, TUid aCategory, TInt aKey );

		void ConstructL();

	private:	// from CActive

		void RunL();

		void DoCancel();

		TInt RunError();	

	private:    // Data

	    RProperty iProperty;

	    MPSCallback& iCallback;

	    TUid iCategory;

	    TInt iKey;

   };

} // namespace AiXmlUiController

#endif      // C_PSOBSERVER_H 

//  End of File