videocollection/hgmyvideos/inc/vcxhgmyvideosthumbnailmanager.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Wed, 15 Sep 2010 12:15:24 +0300
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/*
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* Copyright (c) 2010 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:   CVcxHgMyVideosThumbnailManager class definition*
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*/
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#ifndef VCXHGMYVIDEOSTHUMBNAILMANAGER_H
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#define VCXHGMYVIDEOSTHUMBNAILMANAGER_H
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// INCLUDE FILES
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#include <thumbnailmanager.h>
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#include <thumbnailmanagerobserver.h>
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// FORWARD DECLARATIONS
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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( CVcxHgMyVideosThumbnailManager ) :
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        public CBase,
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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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         * @return New object.
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         */
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        static CVcxHgMyVideosThumbnailManager* NewL();
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        /**
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         * Two-phased constructor.
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         * 
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         * @return New object. 
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         */
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        static CVcxHgMyVideosThumbnailManager* NewLC();
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        /**
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         * Destructor.
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         */
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        virtual ~CVcxHgMyVideosThumbnailManager();
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    private: // 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: // New methods
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        /**
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         * Peeks if there is thumbnail and fetches it if it exist.
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         * No thumbnail creation is started when thumbnail does not exist.
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         *
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         * @param aSource 
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         * @return TThumbnailRequestId.
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         */
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        TThumbnailRequestId PeekL( CThumbnailObjectSource& aSource );
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        /**
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         * Gets thumbnail and creates it if it does not exist.
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         *
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         * @param aSource 
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         * @return TThumbnailRequestId.
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         */
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        TThumbnailRequestId GetL( CThumbnailObjectSource& aSource );
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        /**
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         * Cancels thumbnail request
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         *
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         * @param aRequestId
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         */
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        void Cancel( TThumbnailRequestId aRequestId );
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        /**
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         * Reset the generated thumbnails from given source
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         * 
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         * aSource Thumbnail source
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         */
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        void Reset( CThumbnailObjectSource& aSource );
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        /**
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         * Adds observer.
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         *
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         * @param aObserver 
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         */
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        void AddObserverL( MThumbnailManagerObserver& aObserver );
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        /**
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         * Removes observer.
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         *
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         * @param aObserver 
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         */
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        void RemoveObserver( MThumbnailManagerObserver& aObserver );
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    private:    
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        /**
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         * Default constructor
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         */
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        CVcxHgMyVideosThumbnailManager();
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        /**
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         * SessionL
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         * @return CThumbnailManager ref.
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         */
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        CThumbnailManager& SessionL();
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    private:
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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* iTnManager;
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        /** 
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         * Used for storing the observers. Pointers are not own.
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         */ 
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        RPointerArray<MThumbnailManagerObserver> iTnObservers;
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        /** 
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         * Stores current thumbnail generation flags
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         */ 
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        CThumbnailManager::TThumbnailFlags iCurrentFlags;
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    };
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#endif // VCXHGMYVIDEOSTHUMBNAILMANAGER_H