Re: Add a 'Total's' row to a FunctionList

I'm currently using an EventTableModel. If I create a class that extends the
EventTableModel how would I tell it to report an extra line?

James Lemieux wrote:
>
> GL has architecture for computing "calculations" based on List elements.
> It's new as of about 2 months ago. You can find it in the latest builds,
> though no screencasts exist for it yet.
>
> This would be the equivalent of Gerrit's Totalizer, though it is intended
> to
> assume almost nothing about the value that it is computing (i.e. it might
> not be a sum... in fact it might not even be numeric).
>
> As for how to add these totals into your table, I'd say a custom
> TableModel
> is your best bet. It would extend or delegate to an EventTableModel for
> all
> data rows, but would report an extra row reserved just for the total
> information. Since using the GL calculations as the last row in a JTable
> is
> a very common usage, this may be code that should be present in the GL
> core...
>
> James
>
> On Wed, Mar 26, 2008 at 6:13 AM, Gerrit Cap <Gerrit.Cap@...> wrote:
>
>> 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?
>> >
>>
>> --
>> -------------------- Marble Consulting ----------------------
>> Gerrit Cap                      http://www.marble.be/
>> OO Solutions Engineer           mailto:Gerrit.Cap@...
>> Marble Consulting               gsm : +32 475 72.94.36
>> Vinkenbosstraat 13              tel : +32 16 89.50.55
>> B-3001 Heverlee                 fax : +32 16 89.50.58
>>
>>
>>
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>
>

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