Determines the desired span when using the given
tab expansion implementation. If a container
calls this method, it will do so prior to the
normal layout which would call getPreferredSpan.
A view implementing this should give the same
result in any subsequent calls to getPreferredSpan
along the axis of tab expansion.
Returns:
the desired span >= 0
Parameters:
-
x - the position the view would be located
at for the purpose of tab expansion >= 0.
-
e - how to expand the tabs when encountered.