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From: Wolfgang Schuster via ntg-context <ntg-context@ntg.nl>
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Subject: Re: Test for displaying a header
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Fabrice Couvreur schrieb am 27.08.2021 um 10:04:
> Hi Wolfgang,
> This may not be nicest but seems to work
> Fabrice
>
> %%%%%%%%%%%%%%%%%%%%%%
>
> \definelayout
> [1]
>   [header=10mm]
>
> \setuplayout
>   [header=0pt,
>  height=middle]
>
> \setuppagenumbering
> [alternative=doublesided,location=]
>
> \setupbackgrounds
> [header]
>   [text]
>   [frame=off,bottomframe=on,
>  framecolor=lightgray,rulethickness=1pt]
>
> \startsetups[header]
> \doifelse{\totalnumberofpages}{1}
>     {\setuplayout[1]}
> {\setuplayout[reset]}
> \stopsetups
>
>
> \starttext
> \input knuth
> %\dorecurse{10}{\input knuth\par}
> \stoptext

I have no idea what you try to achieve but the check for the number of 
pages in your document is never used. The layout on the first page is 
different from the following pages but this is just how \definelayout 
work when you use a number as first argument.


What you have to understand is that a setups-environment is just a macro 
definition where you provide the names as argument to the start command. 
This means

     \startsetups [header]
     ...
     \stopsetups

works the same way as

     \def\internalname_header
       {...}

but you have to use

     \setups [header]

rather than

     \internalname_header

to get the content of the environment.


Wolfgang


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<html theme="default-light" iconset="color"><head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head><body text="#000000"><br>
<br>
<span>Fabrice Couvreur schrieb am 27.08.2021 um 10:04:</span><br>
<blockquote type="cite" 
cite="mid:CACyK-eryA8rxnsbOXbU7aOW0=PHFKsLSchU-J5vn7CsjOpJT2A@mail.gmail.com">
  <meta http-equiv="content-type" content="text/html; charset=utf-8">
  <div dir="ltr"><div class="gmail_default" 
style="font-family:verdana,sans-serif">Hi Wolfgang,</div><div 
class="gmail_default" style="font-family:verdana,sans-serif"><span 
class="gmail-VIiyi" lang="en"><span class="gmail-JLqJ4b gmail-ChMk0b"><span>This
 may not be nicest but seems to work</span></span></span></div><div 
class="gmail_default" style="font-family:verdana,sans-serif"><span 
class="gmail-VIiyi" lang="en"><span class="gmail-JLqJ4b gmail-ChMk0b"><span>Fabrice<br></span></span></span></div><div
 class="gmail_default" style="font-family:verdana,sans-serif"><span 
class="gmail-VIiyi" lang="en"><span class="gmail-JLqJ4b gmail-ChMk0b"><span><br></span></span></span></div><div
 class="gmail_default" style="font-family:verdana,sans-serif"><span 
class="gmail-VIiyi" lang="en"><span class="gmail-JLqJ4b gmail-ChMk0b"><span>%%%%%%%%%%%%%%%%%%%%%%</span></span></span></div><div
 class="gmail_default" style="font-family:verdana,sans-serif"><span 
class="gmail-VIiyi" lang="en"><span class="gmail-JLqJ4b gmail-ChMk0b"><span><br></span></span></span></div><div
 class="gmail_default" style="font-family:verdana,sans-serif"><span 
class="gmail-VIiyi" lang="en"><span class="gmail-JLqJ4b gmail-ChMk0b"><span>\definelayout<br> 
 [1]<br>  [header=10mm]<br><br>\setuplayout<br>  [header=0pt,<br>  
 height=middle]<br><br>\setuppagenumbering<br>  
[alternative=doublesided,location=]<br><br>\setupbackgrounds<br>  
[header]<br>  [text]<br>  [frame=off,bottomframe=on,<br>  
 framecolor=lightgray,rulethickness=1pt]<br><br>\startsetups[header]<br> 
 \doifelse{\totalnumberofpages}{1}<br>    {\setuplayout[1]}<br>    
{\setuplayout[reset]}<br>\stopsetups<br><br><br>\starttext<br>\input 
knuth<br>%\dorecurse{10}{\input knuth\par}<br>\stoptext</span></span></span></div></div>
</blockquote>
<br>
I have no idea what you try to achieve but the check for the number of 
pages in your document is never used. The layout on the first page is 
different from the following pages but this is just how \definelayout 
work when you use a number as first argument.<br>
<br>
<br>
What you have to understand is that a setups-environment is just a macro
 definition where you provide the names as argument to the start 
command. This means<br>
<br>
    \startsetups [header]<br>
    ...<br>
    \stopsetups<br>
<br>
works the same way as<br>
<br>
    \def\internalname_header<br>
      {...}<br>
<br>
but you have to use<br>
<br>
    \setups [header]<br>
<br>
rather than<br>
<br>
    \internalname_header<br>
<br>
to get the content of the environment.<br>
<br>
<br>
Wolfgang<br>
<br>
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