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#ifndef SD_SLIDESORTER_CACHE_REQUEST_PRIORITY_CLASS_HXX
#define SD_SLIDESORTER_CACHE_REQUEST_PRIORITY_CLASS_HXX

namespace sd { namespace slidesorter { namespace cache {


/** Each request for a preview creation has a priority.  This enum defines
    the available priorities.  The special values MIN__CLASS and MAX__CLASS
    are/can be used for validation and have to be kept up-to-date.
*/
enum RequestPriorityClass
{
    MIN__CLASS = 0,
    
    // The slide is visible.  A preview does not yet exist.
    VISIBLE_NO_PREVIEW = MIN__CLASS,
    // The slide is visible.  A preview exists but is not up-to-date anymore.
    VISIBLE_OUTDATED_PREVIEW,
    // The slide is not visible.
    NOT_VISIBLE,
    
    MAX__CLASS = NOT_VISIBLE
};


} } } // end of namespace ::sd::slidesorter::cache

#endif