/*

* Copyright (c) 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 MCSCHILDRENSCANNER_H_

#define MCSCHILDRENSCANNER_H_

#include <e32base.h>

#include "menuengoperation.h"

#include "mcsmenuitem.h"

class CMenuSrvEng;

/**

 * Interface for updating Now Playing entry after Publish&Subscribe events.

 *

 * @since S60 v3.2

 */

class MMcsChildrenScanner

    {

public:

    virtual void HandleChildrenEvent(TInt aId, TUint oldCount, TUint newCount) = 0;

    };

/**

 *  Children Scanner Active Object.

 *  @lib mcsmenu.lib

 *  @since S60 v5.0

 */

NONSHARABLE_CLASS( CMcsChildrenScanner ) : 

    public CActive,

    public MMenuEngOperation

    {

public:

    /**

     * Creates an instance of CMcsChildrenScanner implementation.

     *

     * @since S60 v5.0

     */

    static CMcsChildrenScanner* NewL( 

    	MMcsChildrenScanner& aObserver, 

        CMenuSrvEng& aSrvEng);

    /**

     * Destructor.

     */

    virtual ~CMcsChildrenScanner();

    void Scan(TInt aId);

private:

   /**

    * Execute engine operation:

    */

    void RunMenuEngOperationL();

    /**

    * Error handling: ignore error.

    * @param aErr Error code.

    */

    void CompletedMenuEngOperation( TInt aErr );

    void ScanFolderL();

private:

    /**

     * Constructor.

     *

     * @since S60 v5.0

     */

	CMcsChildrenScanner ( 

		MMcsChildrenScanner& aObserver, 

        CMenuSrvEng& aSrvEng);

    /**

     * Symbian 2nd phase constructor.

     */

    void ConstructL();

private: // From CActive.

    /**

     * From CActive.

     */

    void DoCancel();

    /**

     * From CActive.

     */

    void RunL();      

    /**

    * Error handling: ignore error.

    * @param aErr Error code.

    */

    TInt RunError( TInt aError );

private: 

    void AddId(TInt aId);

    void RemoveId(TInt aId);

private:

    /**

     * Interface for notifying changes.

     * Not own.

     */

	MMcsChildrenScanner& iObserver;     

	/**

	 * Menu engine.

	 * Not own.

	 */

    CMenuSrvEng& iSrvEng;

    TBool iOpStatus;

    RArray<TInt> iIdBuff;

    };

#endif /*MCSCHILDRENSCANNER_H_*/