Re: [NTG-context] Highlight current chapter in list

8 Nov 2012


      On 11/8/2012 10:48 PM, Wolfgang Schuster wrote:
...
Am 08.11.2012 um 22:37 schrieb Marco Patzer :
...
2012-11-08 Wolfgang Schuster:
...
\setupheadertexts
  [\setups{headlist}]
\startsetups [headlist]
  \framed[align=normal, frame=off]
    {\placelist [chapter] [alternative=highlight, criterium=all]}
\stopsetups
\definelistalternative
  [highlight]
  [renderingsetup=list:highlight]
Why does the custom list alternative succeed in a header but fails
in a layer? A predefined alternative works perfectly in a layer.
Header and footers are added and calculated after the page is finished
but when you put a text in a layer it is fixed at this moment.
The problem in your example with the custom list alternative is that
you haven’t defined it when it is needed, when you put \definelistalternative
and \startsetups … \stopsetups before \setlayer you can see it.
For a dynamic layer take a look at this wiki page: http://wiki.contextgarden.net/Layers#Use_dynamic_content
here is another variant:

\defineoverlay[pagenumber:preset][\texsetup{pagenumber:preset}]

\startsetups pagenumber:preset
     PRESET
\stopsetups

\defineoverlay[pagenumber:action][\texsetup{pagenumber:action}]

\startsetups pagenumber:action
     ACTION
\stopsetups

\setupbackgrounds
   [page]
   [background={pagenumber:preset,pagenumber:action}]

\starttext
     \dorecurse{4}{\page[empty]}
\stoptext

(just to illustrate that an overlay can be used for anything)

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