Re: [docbook-apps] Centering lines of text in FO output

["Bob Stayton" <bobs@sagehill.net>]

Hi Ron,
I was suggesting that a role attribute on literallayout could be used:

<literallayout role="SpecialStuff">
line 1
a longer line 2
</literallayout>

and the stylesheet customization would look like this:

<xsl:attribute-set name="verbatim.properties">
  <xsl:attribute name="text-align">
    <xsl:choose>
      <xsl:when test="@role = 'SpecialStuff'">center</xsl:when>
      <xsl:otherwise>start</xsl:otherwise>
    </xsl:choose>
  </xsl:attribute>
</xsl:attribute-set>

That should have been sufficient, but it didn't work when I tried it. 
Further investigation showed that the template that matches literallayout 
adds its own text-align="start" property to the fo:block, which overrides 
the attribute-set.  Ugh.

So you have to also customize the template with match="literallayout" from 
fo/verbatim.xsl to remove its text-align property so the attribute-set can 
work.

        <xsl:otherwise>
          <fo:block id="{$id}"
                    wrap-option='no-wrap'
                    white-space-collapse='false'
                    white-space-treatment='preserve'
              =>    text-align='start'
                    linefeed-treatment="preserve"
                    xsl:use-attribute-sets="verbatim.properties">
            <xsl:copy-of select="$content"/>
          </fo:block>
        </xsl:otherwise>

That property really ought to be in the attribute-set so it can be more 
easily changed.

Bob Stayton
Sagehill Enterprises
DocBook Consulting
bobs@sagehill.net


----- Original Message ----- 
From: "Ron Catterall" <ron@catterall.net>
To: "Bob Stayton" <bobs@sagehill.net>
Cc: <docbook-apps@lists.oasis-open.org>
Sent: Wednesday, December 06, 2006 12:20 PM
Subject: Re: [docbook-apps] Centering lines of text in FO output


> Bob
> No it doesn't have to be a para, in fact preferably not.  As I saw it, 
> the problem with literallayout is that it is 'literal' and I thought I 
> had to count spaces etc. so that if I change page size that's a hassle. 
> Setting it up as a table I have to use negative row-heights (which is 
> illegal, but works OK with XEP) and there is more code than content and I 
> have to juggle to get it out of the LOT.
>
> Are you suggesting I set up PI to handle a pseudo-attribute?
>
> Would something like this do it:
>
> <literallayout> <?dbfo-justification role="centered" ?>
>    line 1
>    a longer line 2
>    etc
> </literallayout>
>
> with, in the customization layer:
>
> <xsl:variable name="role">
>   <xsl:call-template name="dbfo-attribute">
>     <xsl:with-param name="pis"
> 
> select="ancestor-or-self::entry/processing-instruction('dbfo')" />
>     <xsl:with-param name="attribute" select="'role'" />
>   </xsl:call-template>
> </xsl:variable>
>
> <xsl:attribute-set name="verbatim.properties">
>   <xsl:attribute name="role">
>     <xsl:choose>
>       <xsl:when test="processing-instruction('dbfo-justification')">
>         <xsl-value-of 
> select="processing-instruction('dbfo-justification')" />
>       </xsl:when>
>       <xsl:otherwise>inherit</xsl:otherwise>
>     </xsl:choose>
>   </xsl:attribute>
> </xsl-attribute-set>
>
> I can't see how the centering gets applied.  Sorry, I'm trying to hack 
> some code together without really understanding it.
>
> Ron
>
>>>>  Bob wrote:
> Does it have to be a para?  The processing expectations for para are to 
> flow the text into the available space, not preserve line endings. Your 
> example looks like a literallayout, where line endings are preserved. 
> With a role attribute on the literallayout you could customize the 
> attributes in the 'verbatim.properties' attribute-set to add a centering 
> property.
> <<<
>
> -- 
> Ron Catterall, Phd, DSc         email: ron@catterall.net
> Prolongacion de Hidalgo 140 http://catterall.net/
> San Felipe del Agua tel: +52 951 520 1821
> Oaxaca      68020 Mexico fax: +1 530 348 8309
>
>