I knew full well when I committed this that there's a certain
probability that you're not going to be happy with how I dit it. It's
hard to please you these days. So, is this post of yours a veto?

At any rate, I don't think that generating FOs for missing table cells
is the right approach. As can be seen in my commit, it is perfectly
possible to do without the additional overhead involved with your
solution. And I don't think the code is ugly because of that.

On 11.09.2008 14:11:31 Vincent Hennebert wrote:
> Hi,
> > Author: jeremias
> > Date: Fri Aug 29 09:36:17 2008
> > New Revision: 690319
> > 
> > URL: http://svn.apache.org/viewvc?rev=690319&view=rev
> > Log:
> > Added missing generation of areas for empty grid units in tables with 
> > collapsing border model.
> <snip/>
> I’m not happy with that change. Basically it’s code copy-pasted from
> several places and slightly modified to handle missing cells. I didn’t
> spend months trying to clean up the table layout code to see that kind
> of change introduced at the first opportunity...
> A bit of background first: distinction needs to be made between /empty/
> cells (existing table-cell elements with no content), and /missing/
> cells (missing table-cell element; e.g., only three cells on a row in
> a four-column table). The EmptyGridUnit class is meant to handle that
> latter case only (yes, it’s misnamed). I didn’t have the opportunity of
> addressing that issue when I worked on tables, so I left it as is.
> That EmptyGridUnit class doesn’t fit well in the big picture. It
> constantly requires special care just because you can’t get a non-null
> TableCell object from it. The only way I could think of to handle that
> properly is to ‘fix’ the FO tree, completing it by adding empty
> table-cell elements. Basically in FixedColRowGroupBuilder.endRow(),
> instead of filling the gaps with EmptyGridUnit objects, proper TableCell
> objects would be created in some way.
> To achieve that we need to be able to create FONode objects outside of
> the FOTreeBuilder machinery. Or to trigger the proper events on
> FOTreeBuilder so that new TableCell objects are ‘automatically’ created.
> I haven’t had the opportunity to look into it into more details, but I’d
> rather explore this possibility, instead of dealing with EmptyGridUnit.
> If FO tree specialists have any comments or suggestions...
> Thanks,
> Vincent

Jeremias Maerki

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