I don't think there is a generic solution for this. But I've created in
the past a TotalizingList which is very similar to the FunctionList.
In short this TotalizingList
1) maintains a copy of the original source list as an extension of
TransformingList
2) creates an extra object "the total"
3) size() == source.size() +1, and also adjust get(int) ...
4) defines an interface Totalizer which defines an addToTotal method
and removeFromTotal method called when objects are inserted or deleted
(update == delete of old + insert of new)
5) on listChanges -> delegate to the totalizer function and
broadcast list changes as source list changes + last row also updated.
Gerrit
Dan MacLeod wrote:
> I have a FunctionList that creates new Objects based on a GroupingList, and a
> JTable that displays the results. I'd like to add a 'Total' row at the
> bottom of the table that adds up the values in each column, is there a way
> to do this?
>
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