On Thu, Jul 24, 2008 at 2:34 PM, Alan Stone wrote:

I understood from this post http://archive.contextgarden.net/message/20050708.105010.33153980.en.html there were issues with the different solutions offered.

You should give it a try, a few of the points concerned security reasons and old version of Acrobat Reader, there is also a wiki page about this topic. http://wiki.contextgarden.net/Hiding_Content

...

Do you want to hide only text or also figures, tables, formulae etc.

For the time being there's only text, however in a later stage there will be figures/pics too.

...

do you need a solution that will work also over page breaks.

Yes, to make a preview version of a book.

And you want to hide part of the content for ... Wolfgang

On Thu, Jul 24, 2008 at 3:21 PM, Alan Stone wrote:

...

And you want to hide part of the content for ...

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. Wolfgang PS: Can you try to avoid top posts.

On Thu, Jul 24 2008, Wolfgang Schuster wrote:

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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 - the replacement are random letters printed in white Cheers, Peter -- http://pmrb.free.fr/contact/

On Thu, Jul 24, 2008 at 9:43 PM, Peter Münster 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

Peter Münster 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?

Yes, pretty easy, but it depends a bit on what you want. Here is a solution that really removes selected boxes from the output PDF (it is un-optimised on purpose): % engine = luatex \defineattribute [ghosted] \def\starthidden {\dosetattribute{ghosted}\plusone} \def\stophidden {\doresetattribute{ghosted}} \ctxlua{ callback.register ('pre_output_filter', function (h) for v in node.traverse(h) do if ( ( v.id == node.id('hlist') or v.id == node.id('vlist') ) and ( node.has_attribute(v,\dogetattributeid{ghosted}) ) ) then node.free(v.list) v.list = nil end end return true end) }

Examples: - the replacement are only the corresponding line-skips - the replacement are random letters printed in white

You can get those effects by changing the lua loop node.traverse to do something more interesting (perhaps by recursive descend). Best wishes, Taci

What do you mean by "do a run of the completed matter to see what the pagination would be" ? Alan On Thu, Jul 24, 2008 at 5:26 PM, Charles P. Schaum wrote:

Why not, if all else fails, do a run of the completed matter to see what the pagination would be, then do something like:

\newif\ifhidden

% Uncomment this if you want to hide content. % \hiddentrue

\ifhidden % . . . preferrably use ConTeXt-friendly pagination % commands; this was taken from a plain old TeX file. % Shove in white space or \phantom{} boxes with dummy text of % equivalent length; ConTeXt likes its own \blank{} macro. % Raw TeX stuff can mess up pagination and spacing. % % I'm not sure if a \vbox to <dimen> {} works well or not here. % Just try a few ways to see. \else % Put all your usual content here. \fi

It's a kludge, but it should work in a pinch.

Charles

On Thu, 2008-07-24 at 15:21 +0200, Alan Stone wrote:

...

...

And you want to hide part of the content for ...

Enabling people to view the pdf preview version (limited, containing excerpts) before acquiring the full version.

Alan

On Thu, Jul 24, 2008 at 3:03 PM, Wolfgang Schuster wrote: On Thu, Jul 24, 2008 at 2:34 PM, Alan Stone wrote:

> I understood from this post >

http://archive.contextgarden.net/message/20050708.105010.33153980.en.html

...

> there were issues with the different solutions offered.

You should give it a try, a few of the points concerned security reasons and old version of Acrobat Reader, there is also a wiki page about this topic.

http://wiki.contextgarden.net/Hiding_Content

>>Do you want to hide only text or also figures, tables, formulae etc. > > For the time being there's only text, however in a later stage there will be > figures/pics too. > >>do you need a solution that >>will work also over page breaks. > > Yes, to make a preview version of a book.

And you want to hide part of the content for ...

Wolfgang

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...

If your question is of interest to others as well, please add an entry to

___________________________________________________________________________________ the Wiki!

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___________________________________________________________________________________

___________________________________________________________________________________ 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

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Instead of looking to insert "exactly the same amount of blank space as if the content would be typeset", is it possible to generate, in one compile job, the document's preview version (*) with its full version (non-interactive) table of contents (TOC), index, list of figures, ... instead ? (*) using hidden texblocks, or \new\ifhidden ... \ifhidden ... \else ... \fi ( without the spooky phantom thingies ), showing a text block indicating "this part is hidden", to hide whatever is required ( headers, linebreaks, tables, figures etc. ) Or... Create a batch file to - first generate the full version, then - generate the preview version, then - replace the preview version's TOC, index, list of figures, ... with the full version's (non-interactive one) ? Alan