[NTG-context] full expansion in widgets

Henri Menke henrimenke at gmail.com
Thu Jun 22 23:13:32 CEST 2017

On Thu, 2017-06-22 at 20:03 +0200, Pablo Rodriguez wrote:
> Hans,
> I have the following sample:
>     \def\hola{hola}
>     \def\MyContent{B \quotation{C} \hola\ D}
>     \enabledirectives[interaction.identity.preroll]
>     \setupinteraction[state=start, title={\MyContent}]
>     \setupinteractionscreen[option=attachment]
>     \setuppapersize[A5, landscape]
>     \setuppagenumbering[location=]
>     \placebookmarks[chapter]
>     \enabledirectives[references.bookmarks.preroll]
>     \starttext
>     \startchapter[title=\MyContent]
>     \startbuffer[abc]
>         buffer contents
>     \stopbuffer
>     Just an attachment.\attachment[name=buffer.txt, author={Me},
>     title={\MyContent\ \input knuth}, buffer=abc]
>     \setupfield [TextSetup][width=.5\textwidth, height=.5\textwidth,
>          frame=off]
>     \definefield [SomeField] [text] [TextSetup] [\MyContent\ \input
>         knuth]
>     \field[SomeField]
>     \stoptext
> Would it be possible to have full expansion in PDF widgets? (I mean, the
> attachment fields and annotation. and the fill-in text field.)

Full expansion doesn't help you here, because \input is protected (i.e. not expandable).  Either use
\normalinput or do \expandafter\relax\input knuth  (this however leaves a literal \relax in PDF

\def\MyContent{B \quotation{C} \hola\ D}
\setupinteraction[state=start, title={\MyContent}]
\setuppapersize[A5, landscape]
    buffer contents
Just an attachment.\attachment[name=buffer.txt, author={Me},
title={\MyContent\ \input knuth}, buffer=abc]


  [\MyContent\ \normalinput knuth ]


> Many thanks for your help,
> Pablo

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