ncdengine/inc/ncdnodeseenfolder.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Thu, 17 Dec 2009 08:51:10 +0200
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/*
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* Copyright (c) 2007-2008 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:   Contains MNcdNodeSeenFolder
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*
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*/
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#ifndef M_NCDNODESEENFOLDER_H
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#define M_NCDNODESEENFOLDER_H
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#include "catalogsbase.h"
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#include "ncdinterfaceids.h"
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#include "catalogsarray.h"
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class MNcdNode;
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/**
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 * This interface provides functions to obtain unseen child nodes of a folder and
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 * to set them seen. This interface can be queried from a folder node.
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 *
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 * 
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 */
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class MNcdNodeSeenFolder : public virtual MCatalogsBase
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    {
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public:
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    /**
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     * Unique identifier for the interface, required for all MCatalogsBase interfaces.
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     *
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     * 
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     */
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    enum { KInterfaceUid = ENcdNodeSeenFolderUid };
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    /**
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     * Sets the child nodes of the folder as seen. Only the immediate children are set.
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     *
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     * @leave System wide error code.
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     */
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    virtual void SetContentsSeenL() = 0;    
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    /**
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     * Returns the number of new child nodes. All the nodes that are unseen are
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     * regarded as new.
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     *
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     * @param aLevels The number of node hierarchy levels the new nodes are searched from.
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     * 1 means only the children of this node are searched.
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     * @return The number of new items.
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     * @leave System wide error code.
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     */
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    virtual TInt NewCountL( TInt aLevels ) const = 0;
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    /**
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     * Returns an array of the new child nodes. All the nodes that are unseen are
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     * regarded as new.
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     *
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     * The nodes in the array are counted, they must be released after use.
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     *
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     * @param aLevels The number of node hierarchy levels the new nodes are searched from.
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     * 1 means only the children of this node are searched.
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     */
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    virtual RCatalogsArray<MNcdNode> NewNodesL( TInt aLevels ) const = 0;
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protected:
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    /**
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    * Destructor.
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    *
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    * @see MCatalogsBase::~MCatalogsBase
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    */
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    virtual ~MNcdNodeSeenFolder() {}
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    };
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#endif // M_NCDNODESEENFOLDER_H