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Re: I don't understand how SortedList and TableComparatorChooser work together

by Boomah :: Rate this Message:

Thanks for the answers but I'm still unsure (this is my fault for not explaining properly). Let me try again:

The TableComparatorChooser isn't swapping out the Comparator on my SortedList, it is using the Comparator of whatever my TableFormat returns for that column. This is a field in an object contained in my SortedList. So as soon as I click on a column to sort, the SortedList is no longer used, and could just as easily be replaced by an EventList.

I agree with point c) mentioned below. After I had clicked on a column, I might want to revert back to the order that the SortedList says the table should display data in. I can't figure out how to do this though. It doesn't seem I can deselected a column sorting. Is this possible?

So my main point is this: Why does the method TableComparatorChooser.install take a SortedList when it seems to me that taking an EventList would be just as legitimate.

Thanks for any clarification,

Nick.

James Lemieux wrote:

Kevin is correct.

SortedList is a transformation used to create an ordered *view* of any
EventList.

TableComparatorChooser is simply a big fancy way to interpret mouse clicks
on a column header as a change in the Comparator of a SortedList.

If the original question posed in this Thread is essentially "why don't you
just sort data in place, why do you have sorted "views" at all?" that's a
really long winded explanation. Some quick but obvious reasons include:

a) what if I want 2 different sorted views of the same data?
b) what if the original order has special meaning to my app, and shouldn't
be disturbed?
c) how can I return to the original order after it has been disturbed?

etc.

James

On Thu, Apr 30, 2009 at 11:00 AM, Kevin Day <kevin@trumpetinc.com> wrote:

> I'm pretty sure that TableComparitorChooser is actually swapping out the
> comparator on your sorted list.
>
> - K
>
>
> ----------------------- *Original Message* -----------------------
>
> *From:* Boomah <nickdarcy@gmail.com> <nickdarcy@gmail.com>
> *To:* users@glazedlists.dev.java.net
> *Cc:*
> *Date:* Thu, 30 Apr 2009 10:41:56 -0700 (PDT)
> *Subject: I don't understand how SortedList and TableComparatorChooser
> work together*
>
>
> Hi people. I don't understand how SortedList and TableComparatorChooser
> work
> together.
>
> I have objects that get added to a SortedList that represent (via my
> TableFormat) a row in a table. The SortedList uses this object to sort, and
> if I just use a standard JTable, whenever an object is added to my list, it
> gets added to my table in the appropriate position. Everything works
> exactly
> as I would expect.
>
> Now I install a TableComparatorChooser on my JTable. If I start my
> application, I see items being added to the table in the correct position
> given my SortedList as before. However, if I now click on one of the
> columns, it sorts not using my SortedList but by using the objects in the
> column I clicked on. In my case they are all strings and so get sorted
> using
> the standard string comparator.
>
> I don't understand why the TableComparatorChooser requires a SortedList if
> once the user clicks on a column, it gets sorted by th e objects it
> contains.
> Why isn't it possible to use an EventList?
>
> It feels like I'm missing something obvious, but I think that SortedList
> and
> TableComparatorChooser completely work against each other and should be
> separated.
>
> Have I completely missed the point?
>
> Thanks, Nick.
>
>
> --
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> Sent from the GlazedLists - User mailing list archive at Nabble.com.
>
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