[jira] [Comment Edited] (FOP-3153) "Keep-with-next" condition not fullfilled when span="all" is used on a block

["Daniel Norberg (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FOP-3153?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17772564#comment-17772564 ] 

Daniel Norberg edited comment on FOP-3153 at 10/6/23 1:22 PM:
--------------------------------------------------------------

Hi,

I have also noted this problem and don't know about a workaround for your particular issue. It would be great if these items could be fixed related to span all blocks:
 * Keep rules on span all block should apply on preceding and following siblings, and vice versa keep rules on preceding and following siblings should affect the span all block, I don't know of any workaround for this that work satisfactorily.
 * Spacing rules should apply on preceding and following siblings and vice versa. For this, the workaround is to add padding.

Here is a simple FO structure which shows how we would like it to work (assume that the simple-page-master enforces multi column layout):
{code:java}
<fo:flow>
  <fo:block>
    The spacing between this block and the span all-block should be 5mm due to the spacing rule, currently does not work.
  </fo:block>
  <fo:block span="all" keep-with-next.within-page="always" space-before="5mm" space-after="10mm">
    THE SPAN ALL BLOCK
  </fo:block>
  <fo:block>
    This block is kept together with the span all-block due to the keep rule, currently does not work.
    The spacing between this block and the span all-block should be 10mm due to the spacing rule, currently does not work.
  </fo:block>
</fo:flow>{code}
A "funny" thing is that the keep rule works if the following sibling also has span = all. So this works:
{code:java}
<fo:flow>
  <fo:block span="all" keep-with-next.within-page="always">
    Some text
  </fo:block>
  <fo:block span="all">
     This block is kept on the same page as the preceding span all-block.
  </fo:block> 
</fo:flow>{code}
I'm not sure if the latter case is actually a bug with respect to the intended behavior but from a user point of view it would be good if FOP could work as in my first code example.

Even better would be if keep and spacing rules on span all-blocks applied on preceding and following text blocks (i.e. not only on preceding-sibling and following-sibling), this way the spacing and keep rules would work the same as if the span all-block was just like any block in this regard.


was (Author: daniel.norberg@excosoft.se):
Hi,

I have also noted this problem and don't know about a workaround for your particular issue. It would be great if these items could be fixed related to span all blocks:
 * Keep rules on span all block should apply on preceding and following siblings, and vice versa keep rules on preceding and following siblings should affect the span all block, I don't know of any workaround for this that work satisfactorily.
 * Spacing rules should apply on preceding and following siblings and vice versa. For this, the workaround is to add padding.

Here is a simple FO structure which shows how we would like it to work (assume that the simple-page-master enforces multi column layout):

 
{code:java}
<fo:flow>
  <fo:block>
    The spacing between this block and the span all-block should be 5mm due to the spacing rule, currently does not work.
  </fo:block>
  <fo:block span="all" keep-with-next.within-page="always" space-before="5mm" space-after="10mm">
    THE SPAN ALL BLOCK
  </fo:block>
  <fo:block>
    This block is kept together with the span all-block due to the keep rule, currently does not work.
    The spacing between this block and the span all-block should be 10mm due to the spacing rule, currently does not work.
  </fo:block>
</fo:flow>{code}
A "funny" thing is that the keep rule works if the following sibling also has span = all. So this works:

 

 
{code:java}
<fo:flow>
  <fo:block span="all" keep-with-next.within-page="always">
    Some text
  </fo:block>
  <fo:block span="all">
     This block is kept on the same page as the preceding span all-block.
  </fo:block> 
</fo:flow>{code}
I'm not sure if the latter case is actually a bug with respect to the intended behavior but from a user point of view it would be good if FOP could work as in my first code example.

 

 

> "Keep-with-next" condition not fullfilled when span="all" is used on a block
> ----------------------------------------------------------------------------
>
>                 Key: FOP-3153
>                 URL: https://issues.apache.org/jira/browse/FOP-3153
>             Project: FOP
>          Issue Type: Bug
>          Components: fo/block
>    Affects Versions: 2.8
>            Reporter: Jorge Villar
>            Priority: Major
>         Attachments: 877404072.fo, editor - 2023-10-02T091356.171.pdf
>
>
> Hello,
> We have to generate a document with text in two columns, but headings need to extend to both columns using span="all". The problem I am facing is that the "keep-with-next.within-page" condition is set to "always" in all headings, but this condition is not respected in the generated PDF, with headings being at the end of the page, and the next element in the next page. Find attached the sample .fo file and the generated PDF document.
> If there is a workaround for this, it would be greatly appreciated to know. Thanks in advance.



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