Returns the location of
index
in terms of the
model prior to the sort. This method is only useful for events
of type
SORTED
. This method will return -1 if the
index is not valid, or the locations prior to the sort have not
been provided.
Returns:
the index in terms of the model prior to the sort, or -1 if
the location is not valid or the mapping was not provided.
Parameters:
-
index - the index in terms of the view