/*

* Copyright (c) 2002-2009 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:  

*

*/

#ifndef CCLFEVENTHANDLER_H

#define CCLFEVENTHANDLER_H

//  INCLUDES

#include "CCLFServerProxy.h"

#include <CLFContentListing.h>

#include <e32base.h>

// FORWARD DECLARATIONS

class MCLFEventHandlerObserver;

typedef void ( CCLFServerProxy::*TMemberFnOp )( TRequestStatus& aStatus );

typedef TInt ( CCLFServerProxy::*TMemberFnCancel )();

typedef void ( MCLFEventHandlerObserver::*TMemberFnObserver )( TInt aError );

// CLASS DECLARATION

/**

*  Item change event handler.

*

*  @lib ContentListingFramework.lib

*  @since Series 60 3.0

*/

NONSHARABLE_CLASS( CCLFEventHandler ) : public CActive

    {

    public:  // Constructors and destructor

        /**

        * Two-phased constructor.

        */

        static CCLFEventHandler* NewL( CCLFServerProxy& aEventHandler,

                                       MCLFEventHandlerObserver& aObserver );

        /**

        * Destructor.

        */

        virtual ~CCLFEventHandler();

    public: // New functions

        /**

        * Start event observing.

        * @since Series 60 3.0

        */

        void ObserverUpdateStartEvent();

        /**

        * Start event observing.

        * @since Series 60 3.0

        */

        void ObserverUpdateEndEvent();

        /**

        * Get changed items.

        * @since Series 60 3.0

        * @param aItemArray changed item ID array

        */

        void GetChangedItemsL( RArray<TCLFItemId>& aItemArray );

    protected:  // Functions from base classes

        /**

        * From CActive

        */

        void DoCancel();

        /**

        * From CActive

        */

        void RunL();

        /**

        * From CActive

        */

        TInt RunError( TInt aError );

    private:

        void DoStart();

    private:

        /**

        * C++ default constructor.

        */

        CCLFEventHandler( CCLFServerProxy& aEventHandler,

                                 MCLFEventHandlerObserver& aObserver );

    private:    // Data

        // Ref. 

        CCLFServerProxy& iEventHandler;

        // Ref. 

        MCLFEventHandlerObserver& iObserver;

        TMemberFnOp iOperationFunction;

        TMemberFnCancel iCancelFunction;

        TMemberFnObserver iObserverFunction;

    };

#endif // CCLFEVENTHANDLER_H

// End of File