Re: hiding content

["Wolfgang Schuster" <schuster.wolfgang@googlemail.com>]

On Thu, Jul 24, 2008 at 9:43 PM, Peter Münster <pmlists@free.fr> wrote:
> On Thu, Jul 24 2008, Wolfgang Schuster wrote:
>
>> > Enabling people to view the pdf preview version (limited, containing
>> > excerpts) before acquiring the full version.
>>
>> In this case the solution offered in the thread are no solution for your,
>> it's too easy for the customers to make the hidden content visible.
>
> Shouldn't it be very easy with MKIV, to replace the content to hide with
> whatever you want?
> Examples:
> - the replacement are only the corresponding line-skips

%\disablemode[hiding]
\enablemode[hiding]

\unprotect

\def\starthiding
  {\dostartbuffer[hiddencontent][starthiding][stophiding]}

\def\stophiding
  {\bgroup
   \setbox\scratchbox\vbox{\getbuffer[hiddencontent]}%
   \getnoflines{\dimexpr\ht\scratchbox+\dp\scratchbox\relax}%
   \dorecurse{\number\noflines}{\blank[\v!force,\v!line]}%
   \egroup}

\protect

\startnotmode[hiding]
\let\starthiding\relax
\let\stophiding \relax
\stopnotmode

%\showgrid

\starttext

\dorecurse{2}{\input knuth\par}

\starthiding
\input tufte
\stophiding

\dorecurse{2}{\input ward\par}

\starthiding
\input zapf
\stophiding

\input knuth

\stoptext

> - the replacement are random letters printed in white
>
> Cheers, Peter

Regards,
Wolfgang
___________________________________________________________________________________
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  : https://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________