/*

* Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "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:    HG VOD*

*/

#ifndef VCXHGVODCATEGORYLISTMODELHANDLER_H

#define VCXHGVODCATEGORYLISTMODELHANDLER_H

#include <ganes/HgScrollBufferObserverIface.h>

#include "vcxhgvodmainviewcontainer.h"

#include "vcxnscategoryproviderif.h"

#include "vcxnscategoryproviderobserver.h"

class CHgScroller;

class CHgItem;

class CVcxHgVodMainView;

class CVcxNsUiEngine;

class CVcxNsCategory;

class CVcxHgVodCategoryListImpl;

// CLASS DECLARATION

/**

 *  

 *  

 *

 *  @code

 *   

 *  @endcode

 *

 *  @lib vcxhgvodui.lib

 *  @since S60 v5.0

 */

class CVcxHgVodCategoryListModelHandler : public CBase,

                                          public MVcxNsCategoryProviderObserver,

                                          public MHgScrollBufferObserver

    {

public:

    /**

     * Two-phased constructor.

     */

    static CVcxHgVodCategoryListModelHandler* NewL( 

            CVcxNsUiEngine& aDataProviderIf, 

            CVcxHgVodMainView& aView, 

            CHgScroller& aScroller,

            CVcxHgVodCategoryListImpl& aCategoryListImpl );

    /**

     * Two-phased constructor.

     */

    static CVcxHgVodCategoryListModelHandler* NewLC( 

            CVcxNsUiEngine& aDataProviderIf, 

            CVcxHgVodMainView& aView, 

            CHgScroller& aScroller,

            CVcxHgVodCategoryListImpl& aCategoryListImpl );

    /**

    * Destructor.

    */

    virtual ~CVcxHgVodCategoryListModelHandler();

    /**

    * Activate model

    * 

    */

    void DoActivateModelL( );

    /**

    * Deactivate model

    * 

    */

    void DoDeActivateModel( );

    /**

    * Get services and set to widget model.

    * 

    */

    void SetListContentL();

    /**

    * Get category provider interface pointer

    * 

    */

    MVcxNsCategoryProviderIf* CategoryProvider();

public:    

    /**

     * From MVcxNsCategoryProviderObserver

     * Notify category's data has been updated.

     */

    void CategoryUpdated( TInt aIndex );

    /**

     * From MVcxNsCategoryProviderObserver 

     * Application state or full view data needs to be updated.

     */

    void RefreshView();

    /**

     * From MVcxNsCategoryProviderObserver 

     * Application state needs to be updated.

     */

    void HandleAppStateChangedL();

    /**

     * From MVcxNsCategoryProviderObserver

     * Epg update is ongoing, show the notification.

     * When downloading and parsing the xml, both parameters are 0.

     * 

     * @param aDownloaded count of downloaded thumbnails.

     * @param aTotal Total count of thumbnails to be downloaded.

     */

    void ShowUpdatingNoteL( TBool aShow, TInt aDownloadedTbns, TInt aTotalTbns );

    /**

     * From MVcxNsCategoryProviderObserver

     * Handle error 

     * 

     * @param aError Error to handle in UI

     */

    void HandleUpdateErrorL( TInt aError );

private:    

    /**

     * Default constructor

     *

     */

    CVcxHgVodCategoryListModelHandler( 

                CVcxNsUiEngine& aDataProviderIf, 

                CVcxHgVodMainView& aView, 

                CHgScroller& aScroller,

                CVcxHgVodCategoryListImpl& aCategoryListImpl );

    /**

     * Constructor

     *

     */

    void ConstructL( );

    /**

     * Updates data of item in list.

	 * @param aIndex Item's index

     */

   void UpdateListItemL( TInt aIndex );

   /**

    * Refreshes view.

    */

   void RefreshViewL();

   /**

    * From MHgScrollBufferObserver

    * 

    * Buffer position changed. The items between the aBufferStart 

    * and aBufferEnd should be loaded as soon as possible.

    * 

    * @param aBufferStart The index of the first item in buffer.

    * @param aBufferEnd The index of the last item in buffer.

    * @param aDirection The direction of request.

    */

   void Request( TInt aBufferStart, TInt aBufferEnd, THgScrollDirection aDirection );

   /**

    * From MHgScrollBufferObserver

    * 

    * Buffer position changed. The items between the aBufferStart 

    * and aBufferEnd should be released.

    * 

    * @param aBufferStart The index of the first item in buffer.

    * @param aBufferEnd The index of the last item in buffer.

    */

   void Release( TInt aBufferStart, TInt aBufferEnd );

private: // data

    /**

     * Ref to Ui Engine interface.

     * 

     */

    CVcxNsUiEngine& iDataProviderIf;

    /**

     * Reference to vod main view

     *

     */

    CVcxHgVodMainView& iView;

    /**

     * Pointer to category provide if in UI engine

     * 

     */

    MVcxNsCategoryProviderIf* iCategoryProvider;

    /**

     * Pointer to array that holds categories in UI engine

     * Not own.

     */

    RPointerArray<CVcxNsCategory>* iCategories;

    /**

     * Ref to scroller

     * 

     */

    CHgScroller& iScroller;

    /**

     * Ref to list implementation

     * 

     */

    CVcxHgVodCategoryListImpl& iListImpl;

    };

#endif // VCXHGVODCATEGORYLISTMODELHANDLER_H