Re: Distinguished item in \placelist?

[Hans Hagen <pragma@wxs.nl>]

At 03:19 PM 12/1/2001 -0500, F. Miller Maley wrote:
>Suppose that in an interactive document, I would like to have a local
>table of contents (e.g. \placelist[section]) on each page, but I would
>like the current portion (e.g. section) to be highlighted in some way,
>perhaps by style or color, within the list.  What mechanisms are needed
>to achieve this?
>
>I can envision doing it by somehow extracting mark information and list
>information into control sequences and comparing them with \ifx.  However,
>I usually find that whatever I want to do, ConTeXt already has a way of doing!

Well, it's not a feature, but since the info is available, i can imagine 
something like this:

Say that I patch a macro :

\unprotected \def\dolijstelement#1#2#3#4#5#6% pas op: wordt ook elders 
gedefinieerd
   {\doiftoclevelelse[#5]
      {\def\currentlist{#1}%
       \ifundefined{\??li\currentlist\c!huidige}\else
         \doif{#3}\currentheadnumber
           {\edef\currentlist{\getvalue{\??li\currentlist\c!huidige}}}%
       \fi
       \dodolijstelement\currentlist{#2}{#3}{#4}{#5}{#6}}
      {}}

(this assumes a version where \currentheadnumber is known)

now we can define a fake list (since i can imagine that you want to set up 
some layout characteristics)

\definelist [fakesection] [section]

\setuplist [fakesection] [before=\blank,after=\blank,color=green]

\setuplist [section] [current=fakesection]

\setupcolors[state=start]\setupinteraction[state=start]

\starttext

\chapter{test}

\section{test}
\section{test}
\section{test}

\placelist[section][criterium=previous]

\section{test}
\section{test}

\stoptext

We can have a vote for adding this feature -)

Hans
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