Is it possible to embed a scrollable frame inside a PDF?

Question

(This is an end-of-year crazy question)

Is it possible to embed a (scrollable) frame or a PDF inside a PDF? If so, how to do it in (pdf)LaTeX?

This is something pretty common in HTML (see for example http://www.echoecho.com/htmlframes01.htm). Here it is a webpage with PDF frames https://www.cs.tut.fi/~jkorpela/html/iframe-pdf.html

Here it is a fake screenshot so you get the idea.

Portable and non-portable (e.g. only-Acrobat) answers are welcomed.

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Example of a down arrow below a frame. The up arrow can be on top of the frame and the triangles point up.

Answer 1

Vertical scrolling based on the animate package; definition of command \smoothScroll taken from an earlier post with slight modifications.

As an example document, we take lppl.pdf from TEXMF/doc/latex/base/lppl.pdf, the pages somewhat trimmed.

Update with suggestions incorporated:

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Start auto-scroll by clicking on the "widget", pause auto-scroll on mouse-down in the "widget" (and moving the mouse out, while keeping it pressed).

The buttons above and below the "widget" step through the document on mouse click.

[Shift]+click on the buttons rewinds to the top or jumps to the bottom of the document.

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Adobe Reader required. Open on ↗ShareLaTeX.

\documentclass[a5paper]{scrartcl}

\usepackage{multido}
\usepackage{graphicx}
\usepackage{MnSymbol} % \triangle, \triangledown
\usepackage{animate}
\usepackage{media9}   % \mediabutton
\usepackage{xsavebox} % \xsbox{<xsbox id>}{<content>} , \the<xsbox id>

%%%%%%% docToBox  %%%%%%%%
\newcommand\docToBox[3]{%
  % #1 <file name (PDF)>
  % #2 <left> <bot> <right> <top> % trim pages by given amounts (PS points)
  % #3 <boxnum>
  \pdfximage{#1}%  just for counting pages
  \multido{\i=1+1}{\pdflastximagepages}{%
    \global\setbox#3=\vbox{%
      \box#3%
      \hbox to \textwidth{\includegraphics[page=\i,trim=#2,clip,width=\textwidth]{#1}}%
    }%
  }%  
}
%%%%%%% /docToBox %%%%%%%%

%%%%%%% smoothScroll %%%%%
\newcommand\smoothScroll[5][]{%
  % [#1] autoplay, controls, ... (see: texdoc animate)
  % #2 <boxnum>
  % #3 <viewport height>
  % #4 <steps>
  % #5 <steps per sec> while playing; >25 doesn't make sense
  \edef\mywd{\the\wd#2}%
  \edef\myht{\the\ht#2}%
  \edef\mytht{\the\dimexpr\ht#2+\dp#2\relax}%
  \xsbox{XFormOfDoc}{\usebox{#2}}% distill box into re-usable PDF XObject
  \edef\portht{\the\dimexpr#3\relax}%
  \begin{animateinline}[#1,width=\mywd,height=\portht]{#5}%
    \multiframe{#4}{
      dRaiseLen=\the\dimexpr-\myht+\portht\relax+\the\dimexpr(\mytht-\portht)/#4\relax
    }{%
      \begin{minipage}[b][\portht][b]{\mywd}%
        \raisebox{\dRaiseLen}[0pt][0pt]{\theXFormOfDoc}%
      \end{minipage}%
    }%
  \end{animateinline}%
}
%%%%%%% /smoothScroll %%%%%

\begin{document}\Huge

\newbox\lipsumbox
%load the document with trims into save-box
\docToBox{lppl.pdf}{131 110 115 121}{\lipsumbox}
\edef\boxwidth{\the\wd\lipsumbox}% 

\noindent Before you consider using \LaTeX, read the fine-print:\\
\noindent\mediabutton[
  jsaction={
    if(event.shift){anim.lppl.pause();anim.lppl.frameNum=0;}
    else try{anim.lppl.frameNum--}catch(e){}
  }
]{\fboxsep=0pt\framebox[\boxwidth][c]{\tiny\strut$\triangle\triangle\triangle$}}
%the scrolling widget
\noindent{\fboxsep=-\fboxrule\fbox{\smoothScroll[label=lppl]{\lipsumbox}{0.79\textheight}{512}{25}}}
\vskip -0.8\baselineskip
\noindent\mediabutton[
  jsaction={
    if(event.shift){anim.lppl.pause();anim.lppl.frameNum=anim.lppl.numFrames-1;}
    else try{anim.lppl.frameNum++}catch(e){}
  }
]{\fboxsep=0pt\framebox[\boxwidth][c]{\tiny\strut$\triangledown\triangledown\triangledown$}}%

\end{document}