[NTG-context] Hiding the content (drawing empty boxes?)

Hans Hagen pragma at wxs.nl
Thu Jul 7 23:57:23 CEST 2005


Mojca Miklavec wrote:
> Hello,
> 
> Some TeX challenge (probably not solvable?): for gurus only.
> 
> Is there a way to somehow
> 
> \starthidden
> ...
> \stophidden,
> 
> which would leave exactly the same amount of blank space as if the 
> content would be typeset?
> 
> Adam suggested to use transparent font colour, but this doesn't solve 
> the problem as this won't stop the images, frames and nested 
> \color[red]{font color changing commands} being displayed.
> 
> I tried to adapt the macro \demobox from the TeXBOOK which processes 
> token by token and draws an empty box instead of that token. It works 
> perfectly as long as there is only plain text between the braces, but as 
> soon there is something more complex, it breaks. This behaviour is 
> probably to be expected, but I have no idea how to let all the commands 
> do what they are expected to do and only prohibit placing any boxes with 
> some content.

well, how about:

\defineproperty[mojcas-secrets][layer][state=top]

\starttext

\input tufte

\startproperty[mojcas-secrets]\input knuth \stopproperty

\input tufte

\stoptext


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