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From: Hans Hagen <pragma@wxs.nl>
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Subject: Re: Some problems solved, some appeared
Date: Tue, 30 Oct 2001 14:21:11 +0100
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At 06:49 PM 10/26/2001 +0200, you wrote:

>  The  reason  of  this  email is that now a new problem appeared. When
>  compiling  an interactive document (which compiled fine until now), I
>  get a lot of warnings like the following:
>
>! pdfTeX warning (ext4): destination with the same identifier (name{page:1})
>has been already used, duplicate ignored

i already (tried) to solve this, this is a temp hack to keep acro 5 happy 
(esp when one optimizes files), i'm awaiting a pdftex extension with access 
to page-object-numbers (i'm discussing this with thanh).

>And  the  interactive buttons which used these labels disappeared from
>the PDF output. These buttons were defined with:
>
>\startinteractionmenu[right]
>  \but[Adding] How to add\\
>  \but[Exa1] Example 1\\
>  \but[Exa2] Example 2\\
>  \but[Remarks] Remarks\\
>  \vfill
>  \but[CloseDocument] QUIT\\
>\stopinteractionmenu
>
>Only  the  last  button still appears in the output. The others, still
>have their backgrounds, but no text is visible nor clickable.

you can influence the appearance of jumps to the current page with the 
"samepage" key and unknown destinations with the "unknownreference" key.

btw, the following code should be in spec-fdf.tex

\def\doPDFstartgotorealpage#1#2#3#4#5% watch the R append trick
   {\bgroup
    \doifelsenothing{#3}
      {\scratchcounter=0#5\relax
       \ifnum\scratchcounter>0
         \advance\scratchcounter -1 % pdf starts numbering at zero
         \doifelsenothing{#4}
           {\let\PDFfile\empty}
           {\doifparentfileelse{#4}
              {\let\PDFfile\empty}
              {\setreferencefilename#4.\locationfilesuffix\to\PDFfile
               \edef\PDFfile{R /F (\PDFfile)\PDFgotonewwindow}}}%
         \ifx\PDFfile\empty
           \ifovercomePDFpage % a named page ref
             \edef\PDFdestination{(page:\the\scratchcounter)}%
           \else % beware: optimizers remove this one
             \edef\PDFdestination{[\the\scratchcounter\space\PDFpageviewwrd]}%
           \fi
         \else % across files it's a page number
           \edef\PDFdestination{[\the\scratchcounter\space\PDFpageviewwrd]}%
         \fi
         \edef\action{/S /GoTo\PDFfile\space /D \PDFdestination}%
       \else
         \let\action\empty
       \fi}
      {\doifelsenothing{#4}
         {\let\PDFfile\empty}
         {\setreferencefilename/#4\to\PDFfile}%
       \edef\action{/S /URI /URI (#3\PDFfile)}}%
    \ifx\action\empty\else
      \ifsecondaryreference
        \savesecondaryPDFreference\action
      \else
        \getsecondaryPDFreferences
        \doPDFaction
          width #1 height #2
          action {\action \secondaryPDFreferences}%
      \fi
    \fi
    \egroup}

\def\fakePDFpagedestination % as in pdf, we start numbering at zero
   {\iflocation \ifovercomePDFpage \ifarrangingpages \else
      \bgroup
      \advance\realpageno -1
      \expanded{\doPDFdestination name {page:\realfolio}}%
      \egroup
    \fi \fi \fi}

\appendtoks
   \fakePDFpagedestination
\to \everyshipout
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                                   Hans Hagen | PRAGMA ADE | pragma@wxs.nl
                       Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
  tel: +31 (0)38 477 53 69 | fax: +31 (0)38 477 53 74 | www.pragma-ade.com
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