Re: Highlight current chapter in list

From: Hans Hagen <pragma@wxs.nl>
To: mailing list for ConTeXt users <ntg-context@ntg.nl>
Cc: Wolfgang Schuster <wolfgang.schuster@gmail.com>
Subject: Re: Highlight current chapter in list
Date: Thu, 08 Nov 2012 23:16:29 +0100	[thread overview]
Message-ID: <509C2F3D.8070909@wxs.nl> (raw)
In-Reply-To: <3A73320B-F235-44E4-AD2A-5D806A4D5370@gmail.com>

On 11/8/2012 10:48 PM, Wolfgang Schuster wrote:
>
> Am 08.11.2012 um 22:37 schrieb Marco Patzer <homerow@lavabit.com>:
>
>> 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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