Re: Highlight current chapter in list

[Wolfgang Schuster <wolfgang.schuster@gmail.com>]

Am 08.11.2012 um 00:29 schrieb Marco Patzer <homerow@lavabit.com>:

> Hi!
> 
> How do I highlight the current chapter in the table of contents? The
> TOC is displayed on each page. For illustration I misused the
> interaction colour, which of course only works for the first page of
> a chapter.
> 
>  \setupheadertexts
>    [\setups{headlist}]
> 
>  \startsetups [headlist]
>    \framed[align=normal, frame=off]
>      {\placelist [chapter] [alternative=f, criterium=all]}
>  \stopsetups
> 
>  \setupinteraction
>    [state=start,
>     color=lightgray,
>     contrastcolor=darkgreen]
> 
>  \starttext
>    \startchapter [title=alpha]                   \stopchapter
>    \startchapter [title=beta]  \page\input knuth \stopchapter
>    \startchapter [title=gamma]                   \stopchapter
>  \stoptext


You can use the marking mechanism to get the title of the current chapter.

The problem for the solution below is to get a expandable version of the
list entry because \currentlistentrytitle itself isn’t expandable and can’t
be used in \doifelse. Instead of using \ctxcommand better ask Hans for
a raw/expandable version of the tile/pagenumber commands.

\setupheadertexts
  [\setups{headlist}]

\startsetups [headlist]
  \framed[align=normal, frame=off]
    {\placelist [chapter] [alternative=highlight, criterium=all]}
\stopsetups

\definelistalternative
  [highlight]
  [renderingsetup=list:highlight]

\startsetups [list:highlight]
  \par
  \startlinealignment[middle]
    \doifelse{\fetchmark[chapter][first]}{\currentlistentrytitle}
   %\doifelse{\fetchmark[chapter][first]}{\ctxcommand{listtitle("\currentlist",\currentlistindex)}}
      {\color[red] {\currentlistentrytitle}}
      {\color[blue]{\currentlistentrytitle}}
  \stoplinealignment
  \par
\stopsetups

\setupinteraction
  [state=start,
   color=lightgray,
   contrastcolor=darkgreen]

\starttext
  \startchapter [title=alpha]                   \stopchapter
  \startchapter [title=beta]  \page\input knuth \stopchapter
  \startchapter [title=gamma]                   \stopchapter
\stoptext

Wolfgang
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
archive  : http://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________