Re: Dynamically Processing Nodes

Hi Diez,

Nah,
I've got parent/child loops nailed.

It has more to do with using the Iterative Model and dynamically
"growing it"...??

I have the following Objects:
Row
RowsCollection

A row can contain other rows(RowsCollection).

Processing Rows with no children is pretty simple.

e.g.

I can output the following:

<table border="1">
   <tr>
      <td colspan="3">Row 1</td>
      <td><input type="Text" size="3"></td>
   </tr>
   <tr>
      <td colspan="3">Row 2</td>
      <td><input type="Text" size="3"></td>
   </tr>
</table>


However, if a row contains children, I'd like to render something like
this..

e.g.

<table border="1">
   <tr>
      <td colspan="3">Row 1</td>
      <td><input type="Text" size="3"></td>
   </tr>
   <tr>
      <td rowspan="3">Row 2</td>
      <td colspan="2">Row 2.1</td>
      <td><input type="Text" size="3"></td>
   </tr>
   <tr>
      <td rowspan="2">Row 2.2</td>
      <td>Row 2.2.1</td>
      <td><input type="Text" size="3"></td>
   </tr>
   <tr>
      <td>Row 2.2.2</td>
      <td><input type="Text" size="3"></td>
   </tr>
   <tr>
      <td colspan="3">Row 3</td>
      <td><input type="Text" size="3"></td>
   </tr>


Anyway.....
Since the Rows are specified in a config file, the renderer doesn't
know the layout and relationships between the rows.

Getting back to my markup..

<tr class="Dir::Iterate_Start.GridRows Dir::Iterate_Next.GridRows">
  <td class="Dir::Get_Data.GridRows.Label" valign="top">[ROW
LABEL]</td>	
</tr>
<tr class="Dir::Iterate_End.GridRows
Dir::Discard"><td>[DISCARD]</td></tr>

"ROW LABEL" Should either return a 'Text Label' or if a row contains
children, the markup for the children...

Urrm....

Did that make sense?

--KD










>>> [email protected] 2003/12/03 13:50:21 >>>
Hi,

> At the moment, I have Column and Row Objects.
> A Column can be added other Columns. The same goes for Rows.
>
> Now, once I process a row, I need to check if the current row
contains
> any children.
> If it does, execute the same Iterator loop and process the child
Rows.
> Question is... how do I accomplish this...?

I'm not so sure what exactly you want to do here - you want control
over rows 
as well as over the columns one row has?

You need a parent-child iterative model. There have been quite a few 
discussions about this on the list. 

Your markup looks basically like this:

<tr class="Dir::Iterate_Start.RowModel Dir::Iterate_Next.RowModel">
<td class="Dir::Iterate_Start.ColModel Dir::Iterate_Next.ColModel">
</td>
<td class="Dir::Iterate_End.ColModel Dir::Discard">
</td>
</tr>
<tr class="Dir::Iterate_End.RowModel Dir::Discard">
<td></td>
</tr>

The question of yours, about rows in the same iterator-loop - that's
not so 
hard. The easiest way would be to "flatten" your tree of rows - for
that, you 
simply traverse it in preorder and add the rows to a list. That list
backs up 
your rows-model.

Now for the columns - thats a little bit tricky, as I'm not sure how
you want 
your layout. It contains some errors - maybe you can look at that
again?

Regards,

Diez

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