104 /**  Thumbnail request types */

   105 enum TThumbnailRequestType

   106     {

   107     ERequestDeleteThumbnails = 0

   108     };

   109 

   110 /**

   111  *  Optional callback interface for getting information about other completed 

   112  *  requests that don't include a thumbnail. 

   113  *  

   114  *  Request types:

   115  *  - ERequestDeleteThumbnails

   116  *  

   117  *  Can be added using SetRequestObserver(MThumbnailManagerRequestObserver& aObserver)

   118  *  and removed using RemoveRequestObserver().

   119  *

   120  *  @since Symbian^3

   121  */

   122 class MThumbnailManagerRequestObserver

   123     {

   124 public:

   125     /**

   126      * A request is complete.

   127      *

   128      * @since Symbian^3

   129      * @param aError         Error code.

   130      * @param aRequestType   Type of the completed request.

   131      * @param aId            Request ID for the operation.

   132      */

   133     virtual void ThumbnailRequestReady( TInt aError, TThumbnailRequestType aRequestType,

   134         TThumbnailRequestId aId ) = 0;

   135 };

   136