Hi Hans,
in MkII the following is possible without problems:
\setupcolors[state=start]
\startuseMPgraphic{frameborder}
drawoptions(withcolor \MPcolor{\framedparameter{framecolor}}) ;
draw topboundary OverlayBox withpen pencircle scaled
\the\dimexpr\framedparameter{toprulethickness}\relax ;
draw bottomboundary OverlayBox withpen pencircle scaled
\the\dimexpr\framedparameter{bottomrulethickness}\relax ;
draw leftboundary OverlayBox withpen pencircle scaled
\the\dimexpr\framedparameter{leftrulethickness}\relax ;
draw rightboundary OverlayBox withpen pencircle scaled
\the\dimexpr\framedparameter{rightrulethickness}\relax ;
setbounds currentpicture to OverlayBox ;
\stopuseMPgraphic
\defineoverlay[frameborder][\useMPgraphic{frameborder}]
\defineframed
[mpframed]
[ toprulethickness=\framedparameter{rulethickness},
bottomrulethickness=\framedparameter{rulethickness},
leftrulethickness=\framedparameter{rulethickness},
rightrulethickness=\framedparameter{rulethickness},
background=frameborder]
\starttext
\mpframed[width=4cm,height=4cm,toprulethickness=1pt,framecolor=red]{text}
\stoptext
In MkIV this is no longer possible because \framedparameter accepts only
protected keys (e.g. \c!rulethickness)
and on the fly key-value-pairs like
'toprulethickness=\framedparameter{rulethickness}' are also useless because
you need now \c!toprulethickness to use the value in another command like
metapost graphics.
Can you provide a mechanism to access these values again on the user side, e.g.
\userparameter{framed:toprulethickness}.
Best regards,
Wolfgang
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