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/*
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* Copyright (c) 2009 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: VideoThumbnailFetcher class definition
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*
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*/
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#ifndef __VIDEOTHUMBNAILDATAFETCHER_H__
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#define __VIDEOTHUMBNAILDATAFETCHER_H__
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// INCLUDES
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#include <qobject.h>
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#include <qicon.h>
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#include <qlist.h>
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#include <qhash.h>
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#include <mpxitemid.h>
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#include <thumbnailmanager_qt.h>
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// FORWARD DECLARATIONS
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class VideoThumbnailFetcher : public QObject
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{
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/**
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* defined to be able to use signals and slots
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*/
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Q_OBJECT
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public:
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/**
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* Default constructor
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*/
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VideoThumbnailFetcher();
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/**
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* Desctructor
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*/
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~VideoThumbnailFetcher();
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/**
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* Adds thumbnail fetch to the fetch list. pauseFetching should be called
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* before adding fetches for performance reasons. After all fetches have
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* been added, call continueFetching to start the fetch process which passes
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* the internal data to thumbnail manager. Signal thumbnailReady is emitted
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* when fetch is complete.
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*
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* @param fileName path to the media.
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* @param mediaId mpx id for the media.
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* @param priority priority for the fetch.
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*
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*/
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void addFetch(const QString fileName, const TMPXItemId &mediaId, int priority);
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/**
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* Empties fetch list. This does not cancel the possible ongoing fetch on
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* thumbnail manager side.
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*
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*/
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void cancelFetches();
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/**
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* Returns count of the fetches.
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*
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*/
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int fetchCount();
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/**
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* Pauses thumbnail fetching process. This does not pause the possible
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* ongoing fetch on thumbnail manager side.
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*
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*/
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void pauseFetching();
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/**
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* Continues the fetching process. All fetches added with addFetch are
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* started without create thumbnail flag. If there's not any of those,
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* starts creating thumbnails for fetches that have no thumbnail yet.
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* Signal allThumbnailsFetched is emitted if there's nothing to do.
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*
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* @param cancelOngoingFetches if true then all ongoing thumbnail fetches
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* will be canceled.
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*
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*/
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void continueFetching(bool cancelOngoingFetches);
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/**
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* Enables or disables the thumbnail creation for videos that do
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* not have thumbnail already in the database.
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*
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* @param enable true enables thumbnail creation, false disables.
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*
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*/
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void enableThumbnailCreation(bool enable);
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private:
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class ThumbnailFetchData
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{
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public:
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QString mFileName;
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int mPriority;
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TMPXItemId mMediaId;
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int mRequestId;
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};
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protected:
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/**
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* Starts fetching all the thumbnails in fetch list. Create flag is
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* disabled. Thumbnail manager signals to thumbnailReadySlot. If thumbnail
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* fetch fails with -1 the fetch is added to thumbnail creation list,
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* otherwise signal thumbnailReady signal emitted.
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*
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* @param cancelOngoingFetches if true then all ongoing thumbnail fetches
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* will be canceled.
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*
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*/
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void startThumbnailFetches(bool cancelOngoingFetches);
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/**
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* Starts fetching thumbnail with highest priority from creation list.
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* Create flag is enabled. Thumbnail manager signals to thumbnailReadySlot,
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* from there signal thumbnailReady is emitted.
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*
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*/
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void startThumbnailCreation();
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signals:
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/**
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* Signaled after signal from thumbnail manager has been processed and
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* thumbnail fetch process is complete.
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*
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* @param tnData thumbnail
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* @param mediaId mpx id for the media.
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* @param error possible error code from thumbnail manager ( 0 == ok )
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*
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*/
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void thumbnailReady(QPixmap tnData, const TMPXItemId &mediaId, int error);
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/**
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* Signaled when all the fetches have been done.
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*
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*/
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void allThumbnailsFetched();
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private slots:
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/**
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* Thumbnail manager signals this slot when thumbnail is ready
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* for some item.
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*
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* @param tnData thumbnail
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* @param internal internal data to identify the request
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* @param requestId thumbnail manager request id
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* @param error: possible error code from thumbnail manager ( 0 == ok )
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*
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*/
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void thumbnailReadySlot(QPixmap tnData, void *internal, int requestId, int error);
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private: // Data
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/**
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* Thumbnail manager object.
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*/
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ThumbnailManager *mThumbnailManager;
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/**
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* List containing not started thumbnail fetches.
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*
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* key is mpx id.
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* value is thumbnail fetch data.
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*/
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QHash<TMPXItemId, ThumbnailFetchData *> mFetchList;
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/**
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* Hash containing ongoing thumbnail fetches.
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*
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* key is mpx id.
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* value is thumbnail fetch data.
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*/
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QHash<TMPXItemId, ThumbnailFetchData *> mStartedFetchList;
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/**
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* List containing thumbnails that have not been created yet.
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*/
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QList<ThumbnailFetchData *> mCreationList;
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/**
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* Flag indicating if fetching has been paused.
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*/
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bool mPaused;
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/**
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* Flag indicating if thumbnail creation is enabled.
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*/
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bool mTbnCreationEnabled;
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};
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#endif // __VIDEOTHUMBNAILDATAFETCHER_H__
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