This kind of functions provide Pango markup with detail information for the
specified day. Examples for such details are holidays or appointments. The
function returns NULL when no information is available.
aliasGtkCalendarDetailFunc = char* function(GtkCalendar* calendar, uintyear, uintmonth, uintday, void* userData)
This kind of functions provide Pango markup with detail information for the specified day. Examples for such details are holidays or appointments. The function returns NULL when no information is available.