Re: [xsl] [fo] conditional item in the header of a page

["G. Ken Holman" <gkholman@xxxxxxxxxxxxxxxxxxxx>]

At 2009-04-20 12:24 +0200, Geert Bormans wrote:
> In a project I need to add a sign in the header if my page sequence 
> spans multiple pages
>
> Basically I have an fo:page-sequence for every occurrence of an XML 
> element in my source
> This page sequence can span multiple pages
> In the header, I need to add an arrow symbol
> - pointing to the right, if this particular page is not the last one 
> in the sequence
> - pointing to the left, if this particular page is not the first one 
> in the sequence
>
> Potentially a page has two arrow symbols in the page header
> Possibly a page has no arrows (if the XML element only spans one page

This is handled very straightforwardly by using markers.

Retrieve two markers in your header, one for each of the two 
arrows.  For the left arrow graphic use something like:

  <retrieve-marker retrieve-class-name="leftarrow"
                   retrieve-position="first-including-carryover"/>

For the right arrow graphic use something like:

  <retrieve-marker retrieve-class-name="rightarrow"
                   retrieve-position="last-ending-within-page"/>

At the start of your page sequence, have:

  <block>
    <marker marker-class-name="leftarrow"/>
    <marker marker-class-name="rightarrow">
       .... definition of right arrow ....
    </marker>
  </block>
  <block>
    <marker marker-class-name="leftarrow">
      .... definition of left arrow ....
    </marker>
  </block>
  ... rest of page sequence ...

At the end of your page sequence, have:

  ... rest of page sequence ...
  <block>
    <marker marker-class-name="rightarrow"/>
  </block>

With those definitions, the first page's left arrow is empty, but any 
page break after reveals the left arrow, and the start of the 
sequence has a definition of right arrow, but at the very end (there 
is always room for an empty block), the definition is blanked 
out.  So the definition will be blank at the end of the page sequence.

The above will work on a single-page page-sequence.

I hope this helps (and I haven't mistyped!).

. . . . . . . . . Ken

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