On 8/9/2015 1:27 PM, Fabrice Couvreur wrote:

Hi Hans,
In the document Metafun, you use commands that I like, and I try to
understand the definition and operation, which is not always easy with
TeX commands.
Also, in the following code, this does not give the expected result.
Thank you.
Fabrice

\showframe

\setupcolors
   [state=start]

\setuppagenumbering[location=,alternative]

\startuniqueMPgraphic{titled}
path p ;
p := unitsquare xscaled OverlayWidth yscaled OverlayHeight ;
pickup pencircle scaled 1mm ;
drawoptions(withcolor .625yellow) ;
draw llcorner p--lrcorner p ;
setbounds currentpicture to p ;
\stopuniqueMPgraphic

\defineoverlay[titled][\uniqueMPgraphic{titled}]

\def\ChapterCommand#1#2%
   {\setbox0=\hbox to \leftmarginwidth{#1\hss}%
    \hskip-\leftmarginwidth
    \hskip-\leftmargindistance
    \framed
      [background=titled,frame=off,offset=0pt]
      {\box0
       \hskip\leftmargindistance
       #2}}

\setuphead
   [chapter,section,subsection]
   [command=\ChapterCommand,
    color=darkred]

\starttext
\chapter{First}
\section{First}
\subsection{First}
\stoptext

\unexpanded\def\ChapterCommand#1#2%

-----------------------------------------------------------------
                                          Hans Hagen | PRAGMA ADE
              Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
    tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
                                             | www.pragma-pod.nl
-----------------------------------------------------------------
___________________________________________________________________________________
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
___________________________________________________________________________________