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% Copyright 2003--2007 by Till Tantau
% Copyright 2010 by Vedran Mileti\'c
% Copyright 2017 by Joseph Wright
% Copyright 2020 by Joseph Wright, samcarter
%
% 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 LICENSE.md for more details.
%
% version 1.71 bugfix for \pgfpagescurrentpagewillbelogicalpage (hv)
%
%
\mode
<presentation>
\newif\ifbeamer@twoscreenstext
\newif\ifbeamer@dosecondmode
\defbeameroption{previous slide on second screen}[right]%
{%
\ifx\@onlypreamble\@notprerr
\ltx@ifpackageloaded{pgfpages}{}{%
\ClassError{beamer}{`pgfpages' package necessary for this option}{}%
}%
\else%
\RequirePackage{pgfpages}%
\fi%
\pgfpagesuselayout{two screens with lagging second}[second #1]%
\beamer@twoscreenstexttrue
\nofiles
}
\defbeameroption{second mode text on second screen}[right]%
{%
\ifx\@onlypreamble\@notprerr
\ltx@ifpackageloaded{pgfpages}{}{%
\ClassError{beamer}{`pgfpages' package necessary for this option}{}%
}%
\else%
\RequirePackage{pgfpages}%
\fi%
\pgfpagesuselayout{two screens with optional second}[second #1]%
\beamer@twoscreenstexttrue
}
\defbeameroption{always typeset second mode}[true]%
{%
\def\beamer@defaultdosecondmode{#1}%
}
\def\beamer@defaultdosecondmode{false}
\long\def\beamer@dosecondscreennow#1{% called from \beamer@doseveralframes
\ifbeamer@dosecondmode%
{%
\clearpage
\def\beamer@currentmode{second}%
\gdef\beamer@doifnotinframe{}%
\def\beamer@doifinframe{\begin{beamer@frameslide}%
#1%
\end{beamer@frameslide}%
\pgfpagescurrentpagewillbelogicalpage{2}%
\clearpage
}%
\beamer@masterdecode{\beamer@whichframes}%
\beamer@donow
}%
\fi
}
\mode
<all>
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