videocollection/hgmyvideos/inc/vcxhgmyvideosvideodataupdater.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Mon, 18 Jan 2010 20:21:12 +0200
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/*
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* Copyright (c) 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 the License "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:   CVcxHgMyVideosVideoData class definition*
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*/
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#ifndef VCXHGMYVIDEOSVIDEODATAUPDATER_H
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#define VCXHGMYVIDEOSVIDEODATAUPDATER_H
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// INCLUDE FILES
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#include <coemain.h>
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#include <thumbnailmanager.h>
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#include <thumbnailmanagerobserver.h>
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#include "vcxhgmyvideosvideodata.h"
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// FORWARD DECLARATIONS
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class CVcxHgMyVideosModel;
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class CHgScroller;
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class CMPXMediaArray;
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class CThumbnailManager;
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class CVcxHgMyVideosVideoList;
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class CPeriodic;
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// CLASS DECLARATION
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/**
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 *
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 * @lib vcxhgmyvideos.lib
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 */
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NONSHARABLE_CLASS( CVcxHgMyVideosVideoDataUpdater ) :
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        public CActive,
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        public MThumbnailManagerObserver 
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    {
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    public:
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        /**
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         * Two-phased constructor.
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         * 
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         * @param aModel Reference to component model.
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         * @param aScroller Reference to Hg list control.
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         * @param aVideoArray Reference to video array.
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         * @return New object.
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         */
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        static CVcxHgMyVideosVideoDataUpdater* NewL( 
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                CVcxHgMyVideosModel& aModel,
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                CHgScroller& aScroller,
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                CVcxHgMyVideosVideoList& aVideoArray );
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        /**
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         * Two-phased constructor.
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         * 
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         * @param aModel Reference to component model.
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         * @param aScroller Reference to Hg list control.
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         * @param aVideoArray Reference to video array.
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         * @return New object. 
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         */
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        static CVcxHgMyVideosVideoDataUpdater* NewLC( 
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                CVcxHgMyVideosModel& aModel,
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                CHgScroller& aScroller,
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                CVcxHgMyVideosVideoList& aVideoArray );
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        /**
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         * Destructor.
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         */
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        virtual ~CVcxHgMyVideosVideoDataUpdater();
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        /**
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         * Sets data updater to pause or normal mode.
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         * 
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         * @param aPaused If ETrue, updater is paused.
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         */
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        void SetPausedL( TBool aPaused );
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        /**
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         * Called to inform video data updater that info array has changed.
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         * Causes re-setting of all data as info array is the bases for fetched
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         * additional video data.  
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         */
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        void InfoArrayChanged();        
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        /**
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         * Called by video list implementation when new data is needed.
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         * Appends data item into buffer.
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         * 
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         * @param aMPXItemId MPX item id of video data.
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         */
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        void RequestDataL( TMPXItemId aMPXItemId );
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        /**
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         * Called by video list implementation when data is not needed anymore.
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         * Removes data item from buffer.
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         * 
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         * @param aMPXItemId MPX item id of video data.
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         */
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        void ReleaseData( TMPXItemId aMPXItemId );
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    public: // From MThumbnailManagerObserver
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        /**
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         * Preview thumbnail generation or loading is complete.
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         *
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         * @param aThumbnail An object representing the resulting thumbnail.
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         * @param aId Request ID for the operation
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         */
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        void ThumbnailPreviewReady( MThumbnailData& aThumbnail, TThumbnailRequestId aId );
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        /**
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         * Final thumbnail bitmap generation or loading is complete.
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         *
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         * @param aError         Error code.
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         * @param aThumbnail     An object representing the resulting thumbnail.
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         * @param aId            Request ID for the operation.
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         */
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        void ThumbnailReady( TInt aError, MThumbnailData& aThumbnail, TThumbnailRequestId aId );
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    public: // From CActive
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        /**
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         * From CActive.
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         */
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        void RunL();
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        /**
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         * From CActive. 
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         * 
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         * @param aError Error code.
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         * @return KErrNone if continuing is ok.
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         */        
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        TInt RunError( TInt aError );
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        /**
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         * From CActive.
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         */        
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        void DoCancel();
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    protected:    
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        /**
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         * Default constructor
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         *
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         * @param aModel Reference to component model.
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         * @param aScroller Reference to Hg list control.
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         * @param aVideoArray Reference to video array.
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         */
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        CVcxHgMyVideosVideoDataUpdater( 
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                CVcxHgMyVideosModel& aModel,
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                CHgScroller& aScroller,
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                CVcxHgMyVideosVideoList& aVideoArray );
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        /**
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         * 2nd phase constructor.
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         */
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        void ConstructL();
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		/**
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         * Returns index of fetch array based on MPX Item Id.
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         * 
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         * @param aMpxItemId MPX Item Id.
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         * @return Index of array or KErrNotFound.
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         */
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        TInt IndexByMPXItemId( TMPXItemId aMpxItemId );
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        /**
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         * Selects next index to be fetched.  
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         */
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        void SelectNextIndexL();
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        /**
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         * Removes item from fetch array.
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         * 
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         * @param aIndex Index of fetch array.
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         */
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        void RemoveItem( TInt aIndex );
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        /**
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         * Cancels possibly ongoing activities (thumbnail generation, DRM check).
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         *
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         * @param aIndex Index of fetch array.
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         */
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        void CancelActivities( TInt aIndex );
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        /**
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         * Adds item into fetch array. 
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         * 
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         * @param aMPXItemId MPX item id.
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         */
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        void AddItemToFetchArrayL( TMPXItemId aMPXItemId );
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        /**
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         * Cancels any on-going video data operations and deletes fetch array.
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         */
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        void CancelAndDeleteFetchArray();
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        /**
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         * Makes sure that video data fetching continues.
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         */
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        void ContinueVideoDataFetchingL();
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        /**
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         * Updates fetched video data to UI.
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         */
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        void UpdateVideoDataToUiL( CVcxHgMyVideosVideoData& videoData );
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        /**
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         * If needed creates, and returns pointer to Thumbnail Manager.
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         *
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         * @return Pointer to Thumbnail Manager.
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         */
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        CThumbnailManager* ThumbnailManagerL();
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        /**
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         * Checks if list refreshing is needed.
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		 * 
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		 * @param aIndex The item index on the Ganes list that was modified last.
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         * @return ETrue if refreshing is needed, otherwise EFalse.
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		 */
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        TBool ListRefreshNeeded( TInt aIndex );
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        /**
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         * Callback method for RefreshTimer.  
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         */
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        static TInt RefreshTimerCallBack( TAny* aAny );
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        /**
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         * Refreshes the ganes list.
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         */
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        void RefreshScreen();
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    protected:
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        /**
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         * Reference to component's model.
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         * Not own.
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         */
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        CVcxHgMyVideosModel& iModel;
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        /**
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         * Hg list component.
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         * Not own.
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         */
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        CHgScroller& iScroller;
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        /**
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         * Array of videos that need data fetching.
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         * Own
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         */
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        RPointerArray<CVcxHgMyVideosVideoData> iFetchArray; 
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        /**
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         * Reference to video array.
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         * Not own.
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         */
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        CVcxHgMyVideosVideoList& iVideoArray; 
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        /**
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         * S60 Thumbnail Manager.
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         * Own.
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         */
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        CThumbnailManager* iTnEngine;
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        /** 
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         * Used for indicating that list needs to be refreshed.         
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         * Own.
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         */ 
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        CPeriodic* iRefreshTimer;
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        /**
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         * Flag for pause state.
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         */
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        TBool iPaused;
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        /**
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         * Flag indicates that list refresh is delayed. 
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         */
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        TBool iListRefreshIsDelayed;
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    };
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#endif // VCXHGMYVIDEOSVIDEODATAUPDATER_H