% Copyright 2003--2007 by Till Tantau
% Copyright 2010 by Vedran Mileti\'c
% Copyright 2011,2015 by Vedran Mileti\'c, Joseph Wright
%
% This file may be distributed and/or modified
%
% 1. under the LaTeX Project Public License and/or
% 2. under the GNU Public License.
%
% See the file doc/licenses/LICENSE for more details.

\mode
<presentation>


\define@key{beamerframe}{allowdisplaybreaks}[4]{%
  \def\beamer@displaybreak{\allowdisplaybreaks[{#1}]}}
\define@key{beamerframe}{allowframebreaks}[0.95]{%
  \def\beamer@autobreakfactor{#1}\beamer@autobreaktrue}
\define@key{beamerframe}{squeeze}[]{%
  \def\beamer@cramped{\itemsep0pt\topsep0.5pt\relax}}
\define@key{beamerframe}{shrink}[0]{%
  \def\beamer@shrinkpercentage{#1}%
  \@tempdima=-#1pt%
  \@tempdima=0.01\@tempdima%
  \advance\@tempdima by1pt%
  \edef\beamer@shrinkfactor{\strip@pt\@tempdima}%
  \@tempcnta=\@tempdima%
  \divide\@tempcnta by256\relax%
  \@tempdima=256pt%
  \divide\@tempdima by\@tempcnta%
  \edef\beamer@shrinkfactorinv{\strip@pt\@tempdima}%
  \beamer@shrinktrue%
  \def\beamer@cramped{\itemsep0pt\topsep0.5pt\relax}}


%
% Zoom stuff
%

\define@key{beamerzoom}{border}[1]{\def\beamer@zoomborderwidth{#1}}

\def\framezoom<#1><#2>{\@ifnextchar[{\beamer@framezoom<#1><#2>}{\beamer@framezoom<#1><#2>[]}}
\def\beamer@framezoom<#1><#2>[#3](#4,#5)(#6,#7){%
  \par\nointerlineskip%
  \global\beamer@slidehaszoomtrue%
  \advance\beamer@zoomcount by1\relax%
  \def\beamer@zoomborderwidth{0}%
  \edef\beamer@labelzoomed{beamer@labelzoomed@\the\beamer@zoomframecount @\the\beamer@zoomcount}%
  \setkeys{beamerzoom}{#3}%
  \only<#1>{%
    {\hypersetup{pdfhighlight={/P},pdfborder={0 0 \beamer@zoomborderwidth}}%
    \global\setbox\@tempboxa=\vbox{\hyperlink{\beamer@labelzoomed}{%
      \expandafter\ifx\csname XeTeXrevision\endcsname\relax
        \vbox to #7{%
          \hbox to#6{\hfil}%
          \vfil%
        }%      
      \else%
        \begingroup%
          \normalsize%
          \begin{pgfpicture}{0pt}{0pt}{#6}{#7}%
            \pgfsetfillopacity{0}
            \pgftext[x=0cm,y=3pt]{.}
            \pgftext[x=#6,y=\dimexpr#7-\baselineskip+3pt]{.}    
          \end{pgfpicture}%
        \endgroup%
      \fi%    
    }}}%
    \ht\@tempboxa=0pt%
    \wd\@tempboxa=0pt%
    \dp\@tempboxa=0pt%
    \setbox\@tempboxa=\vbox{\moveright#4\hbox{\lower#5\vbox{\box\@tempboxa}}}%
    \ht\@tempboxa=0pt%
    \wd\@tempboxa=0pt%
    \dp\@tempboxa=0pt%
    \global\setbox\beamer@zoombox=\vbox to0pt{\unvbox\beamer@zoombox\box\@tempboxa}%
  }%
  \only<#2>{%
    \@ifundefined{\beamer@labelzoomed}%
    {%
      \hypertarget{\beamer@labelzoomed}{}%
      \expandafter\gdef\csname\beamer@labelzoomed\endcsname{}%
    }{}%
    \gdef\beamer@zoomer{%
      % compute zoom factor
      \@tempdima=\beamer@frametextheight%
      \@tempdimb=#7\relax%
      \@tempcnta=\@tempdimb%
      \divide\@tempcnta by4096\relax%
      \multiply\@tempdima by16\relax%
      \divide\@tempdima by\@tempcnta%
      \@tempdimb=\paperwidth%
      \ifbeamer@plainframe%
      \else%
        \advance\@tempdimb by-\beamer@leftsidebar%
        \advance\@tempdimb by-\beamer@rightsidebar\relax%
      \fi%
      \@tempdimc=#6\relax%
      \@tempcntb=\@tempdimc%
      \divide\@tempcntb by4096\relax%
      \multiply\@tempdimb by16\relax%
      \divide\@tempdimb by\@tempcntb%
      \ifdim\@tempdimb<\@tempdima%
        \@tempdima=\@tempdimb%
      \fi%
      \edef\beamer@temp{\strip@pt\@tempdima}%
      \@tempdimc=\beamer@frametextheight%
      \advance\@tempdimc by4pt%
      \@tempdimb=\paperwidth%
      \ifbeamer@plainframe%
      \else%
        \advance\@tempdimb by-\beamer@leftsidebar%
        \advance\@tempdimb by-\beamer@rightsidebar\relax%
      \fi%
      \setbox\@tempboxa=\vbox{\hsize=\@tempdimb\Acrobatmenu{GoBack}{\vbox to
          \beamer@frametextheight{\hbox to\@tempdimb{\hfil}\vfil}}}%
      \ht\@tempboxa=0pt%
      \wd\@tempboxa=0pt%
      \dp\@tempboxa=0pt%
      \setbox\beamer@framebox=\vbox to\beamer@frametextheight{{%
          \ifbeamer@plainframe\beamer@leftmargin=\Gm@lmargin\fi%
          \begin{pgfpicture}{\beamer@leftmargin}{-\beamer@frametextheight}{\beamer@leftmargin}{0pt}
            \pgftext[left,top]{\box\@tempboxa}
            \pgfpathrectangle{\pgfpoint{0pt}{-\@tempdimc}}{\pgfpoint{\@tempdimb}{\@tempdimc}}%
            \pgfusepath{clip}
            \begingroup
              \pgftransformscale{\beamer@temp}
              \@tempdima=#4\relax%
              \@tempdimb=#5\relax%
              {\pgftransformshift{\pgfpoint{-\@tempdima}{\@tempdimb}}%
              \pgftext[left,top]{\vbox{\vbox{}\nointerlineskip\unvbox\beamer@framebox}}}
            \endgroup
          \end{pgfpicture}%
        }}%
      \setbox\beamer@framebox=\vbox{%
        \nobreak\vbox{}\nobreak\par\nobreak\beamer@entrycode\nobreak%
        \nointerlineskip\unvbox\beamer@frametitlebox%
        \nobreak%
        \box\beamer@framebox%
        \nobreak%
        \vss%
        \beamer@exitcode%
      }%
      \global\setbox\beamer@footins=\box\voidb@x% no footnotes in zoomed slides
    }%
  }%
}

\mode
<article>
{
  \def\framezoom<#1><#2>{\@ifnextchar[{\beamer@framezoom<#1><#2>}{\beamer@framezoom<#1><#2>[]}}
  \def\beamer@framezoom<#1><#2>[#3](#4,#5)(#6,#7){}
}


%
% Shrink stuff
%

\def\beamer@shrinkframebox{%
  \@tempdima=\ht\beamer@framebox%
%  \ifdim\@tempdima>\beamer@frametextheight%
    \@tempcnta=\@tempdima%
    \divide\@tempcnta by 65536\relax%
    \@tempdimc=\beamer@frametextheight%
    \divide\@tempdimc by\@tempcnta\relax%
    \ifdim\@tempdimc>\beamer@shrinkfactor pt%
      \@tempdimc=\beamer@shrinkfactor pt%
    \else%
      \@tempdima=-100\@tempdimc%
      \advance\@tempdima by100pt%
      \ClassWarning{beamer}{Frame text is shrunk by a factor of %
      \strip@pt\@tempdima\space percent instead of
      \beamer@shrinkpercentage\space percent}%
    \fi%
    \edef\beamer@factortemp{\strip@pt\@tempdimc}%
    \setbox\beamer@framebox=\vbox to\beamer@frametextheight{%
      \begin{pgfpicture}{0pt}{-\beamer@frametextheight}{0pt}{0pt}
        {\pgftransformscale{\beamer@factortemp}%
          \pgftext[left,top]{\box\beamer@framebox}}%
      \end{pgfpicture}%
    }%
%  \fi%
}



%
% Auto break stuff
%

\splittopskip=10pt
\newbox\beamer@splitbox
\newcount\beamer@autobreakcount
\newdimen\beamer@autobreaklastheight

\def\beamer@autobreakframe{%
  \beamer@slideinframe=1\relax%
  \advance\beamer@autobreakcount by1\relax%
  \begin{beamer@frameslide}\relax%
    \bgroup%
    \aftergroup\beamer@endautobreak%
    \afterassignment\beamer@checkframetitle%
    \let\beamer@next% gobble opening brace
  }
\def\beamer@endautobreak{\end{beamer@frameslide}%
  \beamer@writeslidentry%
  \ifvoid\beamer@splitbox%
    \let\beamer@next=\beamer@reseteecodes%
  \else%
    \let\beamer@next=\beamer@continueautobreak%
  \fi%
  \beamer@next%
}

\def\beamer@autobreakframebox{%
  \global\setbox\beamer@splitbox=\box\voidb@x%
  \ifbeamer@autobreak%
    % Ok, frame was overful -> split it!
    \splittopskip\baselineskip%
    \setbox\@tempboxa=\vsplit\beamer@framebox to\beamer@autobreakfactor\textheight%
    \global\setbox\beamer@splitbox=\box\beamer@framebox%
    \@tempdima=\ht\beamer@splitbox%
    \ifdim\@tempdima<\beamer@autobreaklastheight%
      \global\beamer@autobreaklastheight=\@tempdima\relax%
    \else%
      \setbox\@tempboxa=\vbox{\unvbox\@tempboxa\unvbox\beamer@splitbox}%
      \global\setbox\beamer@splitbox=\box\voidb@x%
    \fi%
    \setbox\beamer@framebox=\vbox to\textheight{\unvbox\@tempboxa%
      \vskip\beamer@framebottomskipautobreak%
      \ifvoid\beamer@splitbox%
        \ifvoid\beamer@footins%
        \else%
          \begingroup
            \usebeamercolor*[fg]{footnote}%
            \footnoterule%
            \unvbox \beamer@footins%
            \global\setbox\beamer@footins=\box\voidb@x%
          \endgroup  
        \fi%
      \fi%
      \beamer@exitcode%
    }%
  \else%
    \setbox\beamer@framebox=\vbox to\textheight{\unvbox\beamer@framebox%
      \vskip\beamer@framebottomskip%
      \ifvoid\beamer@footins%
      \else%
        \begingroup
          \usebeamercolor*[fg]{footnote}%
          \footnoterule%
          \unvbox \beamer@footins%
          \global\setbox\beamer@footins=\box\voidb@x%
        \endgroup 
      \fi%
      \beamer@exitcode}%
    \global\setbox\beamer@footins=\box\voidb@x%
  \fi%
  }

\newtoks\beamer@frametitletoks
\newtoks\beamer@framesubtitletoks

\def\beamer@continueautobreak{%
  \ifbeamer@noframenumbering\else%
    \refstepcounter{framenumber}%
  \fi%
  \expandafter\beamer@frametitletoks\expandafter{\beamer@frametitle}%
  \expandafter\beamer@framesubtitletoks\expandafter{\beamer@shortframetitle}%
  \edef\beamer@callframetitle{\noexpand\frametitle[\the\beamer@framesubtitletoks]{\the\beamer@frametitletoks}}%
  \expandafter\expandafter\expandafter\beamer@autobreakframe
  \expandafter\expandafter\expandafter{%
    \expandafter\beamer@callframetitle%
    \expandafter\framesubtitle\expandafter{\insertframesubtitle}%
    \unvbox\beamer@splitbox}%
}


\newcommand\insertcontinuationcount{\the\beamer@autobreakcount}
\newcommand\insertcontinuationcountroman{\@Roman\beamer@autobreakcount}
\newcommand\insertcontinuationtext{(\translate{cont}.)}


\mode
<all>
