Willi Egger schrieb am 21.04.2019 um 19:28:
Hi all,

"when manipulating in one area you will have to manipulate also in other aeras” 
I must confess.

I asked some time ago about manipulating the pagenumber. Wolfgang provide me 
the following approach:


\cldcontext{“\letterpercent.0f”,(\pagenumber+1)/2}

This works indeed fine. However now I am confronted with the fact, that in the 
TOC the manipulated pagenumbers should be taken into account.

\def\dwarsliggernumber#1%
  {\number\numexpr(#1+1)/2\relax}

\defineconversion [dwarsligger] [\dwarsliggernumber]

\setuppapersize[A5,landscape]

\setupuserpagenumber[numberconversion=dwarsligger]

\setuppagenumbering[location=none]

\setupheadertexts [\doifoddpageelse{}{\prefixedpagenumber}]
\setupfootertexts [\doifoddpageelse{\prefixedpagenumber}{}]

\usemodule [visual]

\starttext

\completecontent

\dorecurse{10}
  {\chapter{\fakewords{5}{10}}
   \fakelines{50}{100}}

\stoptext

Wolfgang

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