A callback called for each object row when using e_cal_cache_search_with_callback() function.
an #ECalCache
a unique object identifier
an optional Recurrence-ID of the object
the object revision
the object itself
extra data stored with the object
object's custom flags
object's offline state, one of #EOfflineState
A callback called for each object row when using e_cal_cache_search_with_callback() function.