/*

* Copyright (c) 2006-2007 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:  Implementation class of Thumbnail Manager

 *

*/

#ifndef THUMBNAILMANAGERIMPL_H

#define THUMBNAILMANAGERIMPL_H

#include <fbs.h>

#include "thumbnailmanager.h"

#include "thumbnailsession.h"

#include "thumbnailrequestqueue.h"

#include "thumbnaildata.h"

class CThumbnailRequestActive;

/**

 *  Implementation class of thumbnail engine.

 *

 *  @since S60 v5.0

 */

NONSHARABLE_CLASS( CThumbnailManagerImpl ): public CThumbnailManager

    {

public:

    /**

     * Destructor

     *

     * @since S60 v5.0

     */

    virtual ~CThumbnailManagerImpl();

    /**

     * Two-phased constructor

     *

     * @since S60 v5.0

     * @param  aObserver Observer to receive notifications about completed

     *                   operations.

     * @return           New CThumbnailManagerImpl instance.

     */

    static CThumbnailManagerImpl* NewLC( MThumbnailManagerObserver& aObserver );

    /**

     * Get a thumbnail for an object file. If a thumbnail already exists, it

     * is loaded and if a thumbnail does not exist, it is created

     * transparently. ThumbnailReady() callback will be called when the

     * operation is complete. In addition, ThumbnailPreviewReady()

     * callback may be called if EOptimizeForQualityWithPreview mode was

     * defined.

     *

     * Current values for display mode, thumbnail size, flags and performance

     * preference are used.

     *

     * @since S60 v5.0

     * @param aObjectSource      Source object or file

     * @param aClientData        Pointer to arbitrary client data.

     *                           This pointer is not used by the API for

     *                           anything other than returning it in the

     *                           ThumbnailReady callback.

     * @param aPriority          Priority for this operation

     * @return                   Thumbnail request ID

     */

    TThumbnailRequestId GetThumbnailL( CThumbnailObjectSource& aObjectSource,

        TAny* aClientData = NULL, const TInt aPriority = CActive::EPriorityIdle );

    /**

     * Get a thumbnail for an object file. If a thumbnail already exists, it

     * is loaded and if a thumbnail does not exist, it is created

     * transparently. ThumbnailReady() callback will be called when the

     * operation is complete. In addition, ThumbnailPreviewReady()

     * callback may be called if EOptimizeForQualityWithPreview mode was

     * defined.

     *

     * Current values for display mode, thumbnail size, flags and performance

     * preference are used.

     *

     * @since S60 v5.0

     * @param aObjectSource      Source object or file

     * @param aClientData        Pointer to arbitrary client data.

     *                           This pointer is not used by the API for

     *                           anything other than returning it in the

     *                           ThumbnailReady callback.

     * @param aPriority          Priority for this operation

     * @param aGeneratePersistentSizesOnly  Only persitent sizes generated

     * @return                   Thumbnail request ID

     */    

    TThumbnailRequestId GetThumbnailL( CThumbnailObjectSource& aObjectSource,

    	TAny* aClientData, const TInt aPriority, TBool aGeneratePersistentSizesOnly );    

    /**

     * Get a persistent thumbnail for an object file. If a thumbnail already

     *  exists, it is loaded and if a thumbnail does not exist, it is created

     * transparently. ThumbnailReady() callback will be called when the

     * operation is complete. In addition, ThumbnailPreviewReady()

     * callback may be called if EOptimizeForQualityWithPreview mode was

     * defined.

     *

     * Current values for display mode, thumbnail size, flags and performance

     * preference are used.

     *

     * @since S60 v5.0

     * @param aThumbnailId       Thumbnail ID

     * @param aThumbnailSizeType Thumbnail size enumeration

     * @param aClientData        Pointer to arbitrary client data.

     *                           This pointer is not used by the API for

     *                           anything other than returning it in the

     *                           ThumbnailReady callback.

     * @param aPriority          Priority for this operation

     * @return                   Thumbnail request ID. This can be used to

     *                           cancel the request or change priority.

     *                           The ID is specific to this CThumbnailManager

     *                           instance and may not be shared with other

     *                           instances.

     */        

    TThumbnailRequestId GetThumbnailL( const TThumbnailId,

        TAny* aClientData = NULL, TInt aPriority = CActive::EPriorityIdle );

    /**

     * Import an image to be used as thumbnail for an object. If a

     * thumbnail already exists, it is loaded and if a thumbnail does not

     * exist, it is created transparently. ThumbnailReady() callback will be

     * called when the operation is complete. In addition, ThumbnailPreviewReady()

     * callback may be called if EOptimizeForQualityWithPreview mode was

     * defined.

     * 

     * Current values for display mode, thumbnail size, flags and performance

     * preference are used.

     *

     * @since S60 v5.0

     * @param aObjectSource      Source object or file

     * @param aTargetUri         Target URI to which the imported thumbnail is linked.

     * @param aClientData        Pointer to arbitrary client data.

     *                           This pointer is not used by the API for

     *                           anything other than returning it in the

     *                           ThumbnailReady callback.

     * @param aPriority          Priority for this operation

     * @return                   Thumbnail request ID

     */

    TThumbnailRequestId ImportThumbnailL( CThumbnailObjectSource& aObjectSource,

        const TDesC& aTargetUri, TAny* aClientData = NULL,

        const TInt aPriority = CActive::EPriorityIdle );    

     /**

      * Set persistent size scaled thumbnails for an object. If a

      * thumbnail already exists, it is replaced and if a thumbnail does not

      * exist, it is created transparently.

      * 

      * Current values for display mode, thumbnail size, flags and performance

      * preference are used.

      *

      * @since S60 v5.0

      * @param aObjectSource      Source object or file

      * @param aClientData        Pointer to arbitrary client data.

      *                           This pointer is not used by the API for

      *                           anything other than returning it in the

      *                           ThumbnailReady callback.

      * @param aPriority          Priority for this operation

      * @return                   Thumbnail request ID. This can be used to

      *                           cancel the request or change priority.

      *                           The ID is specific to this CThumbnailManager

      *                           instance and may not be shared with other

      *                           instances.

      */     

    TThumbnailRequestId SetThumbnailL( CThumbnailObjectSource& source,

        TAny* aClientData = NULL, 

        TInt aPriority = CActive::EPriorityIdle );    

    /**

     * Get the current display mode for thumbnail bitmaps.

     *

     * @since S60 v5.0

     * @return Default display mode for the thumbnail bitmaps.

     */

    TDisplayMode DisplayMode()const;

    /**

     * Set the current display mode for thumbnail bitmaps.

     *

     * @since S60 v5.0

     * @param aDisplayMode New display mode value for the thumbnail bitmaps.

     */

    void SetDisplayModeL( const TDisplayMode aDisplayMode );

    /**

     * Get the current quality versus performance preference.

     *

     * @since S60 v5.0

     * @return Current quality versus performance preference.

     */

    TThumbnailQualityPreference QualityPreference()const;

    /**

     * Set quality versus performance preference.

     *

     * @since S60 v5.0

     * @param aQualityPreference New quality versus performance preference

     *                           value.

     */

    void SetQualityPreferenceL( const TThumbnailQualityPreference

        aQualityPreference );

    /**

     * Get the current desired size for thumbnail bitmaps.

     *

     * @since S60 v5.0

     * @return Current desired size for thumbnail bitmaps (in pixels).

     */

    const TSize& ThumbnailSize()const;

    /**

     * Set desired size for thumbnail bitmaps.

     *

     * @since S60 v5.0

     * @param aThumbnailSize New quality for the desired thumbnail size.

     */

    void SetThumbnailSizeL( const TSize& aThumbnailSize );

    /**

     * Set desired size for thumbnail bitmaps.

     *

     * @since S60 v5.0

     * @param aThumbnailSize New quality for the desired thumbnail size.

     */

    void SetThumbnailSizeL( const TThumbnailSize aThumbnailSize );

    /**

     * Get current flags for thumbnail generation.

     *

     * @since S60 v5.0

     * @return Current flags.

     */

    TThumbnailFlags Flags()const;

    /**

     * Set flags for thumbnail generation. Several flags may be enabled

     * by combining the values using bitwise or.

     *

     * @since S60 v5.0

     * @param aFlags New flags.

     */

    void SetFlagsL( const TThumbnailFlags aFlags );

    /**

     * Delete all thumbnails for a given object. This is an asynchronous

     * operation, which always returns immediately.

     *

     * @since S60 v5.0

     * @param aObjectSource Source object or file

     */

    void DeleteThumbnails( CThumbnailObjectSource& aObjectSource );

    /**

     * Delete thumbnails by TThumbnailId. This is an asynchronous

     * operation, which always returns immediately.

     *

     * @since S60 v5.0

     * @param aItemId     TThumbnailId

     */

    void DeleteThumbnails( const TThumbnailId aItemId );       

    /**

     * Create thumbnail for a given object. This is an asynchronous

     * operation, which always returns immediately. No callbacks are

     * emitted.

     *

     * @since S60 v5.0

     * @param aObjectSource      Source object or file

     * @param aPriority          Priority for this operation

     * @return                   Thumbnail creation request ID

     */

    TThumbnailRequestId CreateThumbnails( CThumbnailObjectSource& aObjectSource,

                                          TInt aPriority = CActive::EPriorityIdle );

    /**

     * Cancel a thumbnail operation.

     *

     * @since S60 v5.0

     * @param aId      Request ID for the operation to be cancelled.

     * @return         Symbian OS error code or KErrNone if cancelling was

     *                 successful.

     */

    TInt CancelRequest( const TThumbnailRequestId aId );

    /**

     * Change the priority of a queued thumbnail operation.

     *

     * @since S60 v5.0

     * @param aId           Request ID for the request which to assign a new

     *                      priority.

     * @param aNewPriority  New priority value

     * @return              Symbian OS error code or KErrNone if change was

     *                      successful.

     */

    TInt ChangePriority( const TThumbnailRequestId aId, const TInt aNewPriority );

    /**

     * Get a list of supported file formats for object files.

     * 

     * The return value is a reference to a list that contains each

     * supported MIME type. There may also be wildcards, such as "image/ *".

     * 

     * The returned reference is valid until CThumbnailManager is

     * destroyed or GetSupportedMimeTypesL() is called again.

     *

     * @since S60 v5.0

     * @return A list of supported MIME types. May contain wildcards.

     *         Ownership not transferred.

     */

    const CDesCArray& GetSupportedMimeTypesL();

    /**

     * Update Thumbnails by TThumbnailId. This is an asynchronous

     * operation, which always returns immediately.

     *

     * @since S60 v5.0

     * @param aItemId       TThumbnailId

     * @param aPath         (New) path for the Thumbnail

     * @param aOrientation  Thumbnail orientation

     * @param aModified     Last modified

     * @param aPriority     Priority for this operation

     */

     void UpdateThumbnailsL( const TThumbnailId aItemId, const TDesC& aPath,

                             const TInt aOrientation, const TInt64 aModified, TInt aPriority );

private:

    /**

     * C++ default constructor

     *

     * @since S60 v5.0

     * @param  aObserver Observer to receive notifications about completed

     *                   operations.

     * @return           New CThumbnailManagerImpl instance.

     */

    CThumbnailManagerImpl( MThumbnailManagerObserver& aObserver );

    /**

     * Symbian 2nd phase constructor can leave.

     *

     * @since S60 v5.0

     */

    void ConstructL();

    /**

     * Check that given priority is in range of CActive::TPriority

     *

     * @since S60 v5.0

     * @param aPriority Priority

     * @return Valid priority.

     */

    TInt ValidatePriority( const TInt aPriority );

private:

    // data

    /**

     * Default width of thumbnail.

     */

    TInt iDefaultWidth;

    /**

     * Default height of thumbnail

     */

    TInt iDefaultHeight;

    /**

     * Observer to receive notifications about completed operations.

     */

    MThumbnailManagerObserver& iObserver;

    /**

     * Session.

     */

    RThumbnailSession iSession;

    /**

     * Fileserver.

     */

    RFs iFs;

    /**

     * Request queue processor.

     */

    CThumbnailRequestQueue* iRequestQueue;

    /**

     * Display mode.

     */

    TDisplayMode iDisplayMode;

    /**

     * Flags.

     */

    TThumbnailFlags iFlags;

    /**

     * Quality preference.

     */

    TThumbnailQualityPreference iQualityPreference;

    /**

     * Requested size of thumbnail.

     */

    TSize iSize;

    TThumbnailSize iThumbnailSize;

    /**

     * Request ID for this thumbnail request, session specific.

     */

    TThumbnailRequestId iRequestId;

    /**

     * Font and Bitmap Server session. Only used unless the client

     * does not already have an open session.

     */

    RFbsSession iFbsSession;

    /**

     * Temporary buffer for filename handling

     */

    TFileName iFileNameBuf;

    /**

     * List of supported MIME-types.

     * Own.

     */

    CDesCArraySeg* iMimeTypeList;

};

#endif