--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/videocollection/videocollectionwrapper/inc/videothumbnailfetcher.h	Fri Apr 16 14:59:52 2010 +0300
@@ -0,0 +1,201 @@
+/*
+* 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: VideoThumbnailFetcher class definition
+*
+*/
+
+#ifndef __VIDEOTHUMBNAILDATAFETCHER_H__
+#define __VIDEOTHUMBNAILDATAFETCHER_H__
+
+// INCLUDES
+#include <qobject.h>
+#include <qicon.h>
+#include <qlist.h>
+#include <qhash.h>
+
+#include <thumbnailmanager_qt.h>
+
+// FORWARD DECLARATIONS
+
+class VideoThumbnailFetcher : public QObject
+{
+    /**
+     * defined to be able to use signals and slots
+     */
+    Q_OBJECT
+
+public:
+
+    /**
+     * Default constructor
+     */
+    VideoThumbnailFetcher();
+    
+    /**
+     * Desctructor
+     */
+    ~VideoThumbnailFetcher();
+
+    /**
+     * Adds thumbnail fetch to the fetch list. pauseFetching should be called 
+     * before adding fetches for performance reasons. After all fetches have
+     * been added, call continueFetching to start the fetch process which passes 
+     * the internal data to thumbnail manager. Signal thumbnailReady is emitted 
+     * when fetch is complete. 
+     * 
+     * @param fileName path to the media.
+     * @param internal data identifying the media.
+     * @param priority priority for the fetch.
+     * 
+     */
+    void addFetch(const QString fileName, void *internal, int priority);    
+    
+    /**
+     * Empties fetch list. This does not cancel the possible ongoing fetch on
+     * thumbnail manager side.
+     * 
+     */
+    void cancelFetches();
+    
+    /**
+     * Returns count of the fetches.
+     * 
+     */
+    int fetchCount();
+    
+    /**
+     * Pauses thumbnail fetching process. This does not pause the possible 
+     * ongoing fetch on thumbnail manager side. 
+     * 
+     */
+    void pauseFetching();
+    
+    /**
+     * Continues the fetching process. All fetches added with addFetch are 
+     * started without create thumbnail flag. If there's not any of those, 
+     * starts creating thumbnails for fetches that have no thumbnail yet. 
+     * Signal allThumbnailsFetched is emitted if there's nothing to do.
+     * 
+     */
+    void continueFetching();
+    
+    /**
+     * Enables or disables the thumbnail creation for videos that do  
+     * not have thumbnail already in the database.
+     * 
+     * @param enable true enables thumbnail creation, false disables. 
+     * 
+     */
+    void enableThumbnailCreation(bool enable);
+
+private:
+
+    class ThumbnailFetchData
+    {
+        public:         
+        ThumbnailFetchData() { mInternal = 0; };
+            QString mFileName;
+            int mPriority;
+            void *mInternal;
+    };
+    
+protected:
+    
+    /**
+     * Starts fetching all the thumbnails in fetch list. Create flag is 
+     * disabled. Thumbnail manager signals to thumbnailReadySlot. If thumbnail 
+     * fetch fails with -1 the fetch is added to thumbnail creation list, 
+     * otherwise signal thumbnailReady signal emitted.
+     * 
+     */
+    void startThumbnailFetches();
+    
+    /**
+     * Starts fetching thumbnail with highest priority from creation list. 
+     * Create flag is enabled. Thumbnail manager signals to thumbnailReadySlot,
+     * from there signal thumbnailReady is emitted.
+     *  
+     */
+    void startThumbnailCreation();
+    
+signals:
+    
+    /**
+     * Signaled after signal from thumbnail manager has been processed and
+     * thumbnail fetch process is complete.
+     *
+     * @param tnData thumbnail
+     * @param internal internal data to identify the request
+     * @param error possible error code from thumbnail manager ( 0 == ok )
+     * 
+     */
+    void thumbnailReady(QPixmap tnData, void *internal, int error);
+
+    /**
+     * Signaled when all the fetches have been done.
+     * 
+     */
+    void allThumbnailsFetched();
+    
+private slots:
+    
+    /**
+     * Thumbnail manager signals this slot when thumbnail is ready
+     * for some item.
+     *
+     * @param tnData thumbnail
+     * @param internal internal data to identify the request
+     * @param requestId thumbnail manager request id
+     * @param error: possible error code from thumbnail manager ( 0 == ok )
+     *
+     */
+    void thumbnailReadySlot(QPixmap tnData, void *internal, int requestId, int error);
+
+private: // Data
+
+    /**
+     * Thumbnail manager object.
+     */
+    ThumbnailManager                *mThumbnailManager;
+    
+    /**
+     * List containing not started thumbnail fetches.
+     */
+    QList<ThumbnailFetchData *>     mFetchList;
+    
+    /**
+     * Hash containing ongoing thumbnail fetches.
+     * 
+     * key is thumbnail request id.
+     * value is thumbnail fetch data.  
+     */
+    QHash<int, ThumbnailFetchData *> mStartedFetchList;
+    
+    /**
+     * List containing thumbnails that have not been created yet.
+     */
+    QList<ThumbnailFetchData *>      mCreationList;    
+    
+    /**
+     * Flag indicating if fetching has been paused.
+     */
+    bool                             mPaused;
+    
+    /**
+     * Flag indicating if thumbnail creation is enabled.
+     */
+    bool                             mTbnCreationEnabled;
+};
+
+#endif // __VIDEOTHUMBNAILDATAFETCHER_H__