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21 
22 
23 
24 #ifndef SD_SLIDESORTER_CACHE_REQUEST_PRIORITY_CLASS_HXX
25 #define SD_SLIDESORTER_CACHE_REQUEST_PRIORITY_CLASS_HXX
26 
27 namespace sd { namespace slidesorter { namespace cache {
28 
29 
30 /** Each request for a preview creation has a priority.  This enum defines
31     the available priorities.  The special values MIN__CLASS and MAX__CLASS
32     are/can be used for validation and have to be kept up-to-date.
33 */
34 enum RequestPriorityClass
35 {
36     MIN__CLASS = 0,
37 
38     // The slide is visible.  A preview does not yet exist.
39     VISIBLE_NO_PREVIEW = MIN__CLASS,
40     // The slide is visible.  A preview exists but is not up-to-date anymore.
41     VISIBLE_OUTDATED_PREVIEW,
42     // The slide is not visible.
43     NOT_VISIBLE,
44 
45     MAX__CLASS = NOT_VISIBLE
46 };
47 
48 
49 } } } // end of namespace ::sd::slidesorter::cache
50 
51 #endif
52