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Re: [riena-dev] Table Ridget

Hi Elias,
comments below. I discussed the API issues with Carsten.
Am 30.05.2008 um 22:15 schrieb Volanakis, Elias:


a few comments on the ITableRidget interface. We can discuss these
points on Monday.s

1. bindToModel(...,String[] columnPropertyNames, String[]

It's not specified what happens when columnPropertyNames.length !=
columnHeaders.length. My implementation handles this gracefully and
ignores missing / additional columns. An alternative would be to throw a

Should we document this in the interface?

I believe its better to notify the developer of a programming error than handle it "gracefully"
which probably does NOT mean the same to everybody. So please throw a runtime exception and
note that behaviour in the interface.

2. bindToModel(..., String[] columnPropertyNames, String[] columnHeaders);

Can columnHeaders be null? My implementation allows null on the basis
that the ListRidget (also implementing ITableRidget) allows null,
because the List widget does not have headers. This is done in order to
keep the "handling" of bindToModel similar across different uses making
it easier for the app developer. If columnHeaders is null, the table
will have it's headers hidden automatically. (The Swing implementation
does not allow null.)

We should decide if null is ok and document.

I think null for a single entry in the header is ok (no header for that column) and null in
total for all headers (no visible headers for this table) is also ok. And yes that should
go into the javadoc.

3. Unsorting a column programmatically: tableRidget.setSortedColumn(-1)
is not allowed but it still be accomplished using
tableRidget.setComparator(sortedColumnIndex, null).

Is there a preference one way or the other?

We think that calling setComporator(sortedColumnIndex, null) is pretty odd and not prefered.
setSortedColumn(-1) looks a lot better even if it might call the other method internally.

4. My implementation uses a "creative" way (i.e. unicode char) to show a
"sortable" indicator in the table header. We should discuss if we want
to keep this.

I like your "creative" character. Also the way to set the column to ascending, descending, not sorted by clicking on
the header is just the prefered way to do this. I think the Swing implementation is still missing the unsorted state.

5. My implementation makes all columns moveable by the user by default.
This may override different settings of the app developer.

We should add a method to the Ridget interface to allow or disallow moving of columns. "setReorderingAllowed(bool)". We can discuss
the default. I think it should be "false".

I talk to you later.....
BTW I checked out the riena.example and the table does not show any content (System Properties). Anything I am doing wrong here ?


Elias Volanakis
Technical Lead
Innoopract, Inc.
351 NW 12th Avenue
Portland, Oregon 97209
Tel: +1-503-552-1457
Fax: +1-503-715-4915
Mobile: +1-503-929-5537

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