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+% \iffalse meta-comment -------------------------------------------------------
+% Copyright (C) 2021 Thomas Lambert <trigon@thl.ovh>
+% Other contributors to this theme are listed here:
+%     https://gitlab.com/thlamb/beamertheme-trigon/-/graphs/master
+%
+% The original template was heavily inspired by Metropolis from Matthias
+% Vogelgesang.
+%
+% License CC-BY-SA 4.0
+% This work is licensed under a Creative Commons Attribution-ShareAlike 4.0
+% International License (https://creativecommons.org/licenses/by-sa/4.0/)
+% ------------------------------------------------------------------------- \fi
+% \iffalse
+%<*package>
+\NeedsTeXFormat{LaTeX2e}
+\ProvidesPackage{beamerouterthemetrigon}[2021/03/25 v0.5.0 Trigon outer theme]
+%</package>
+% \fi
+% \CheckSum{0}
+% \StopEventually{}
+% \iffalse
+%<*package>
+% ------------------------------------------------------------------------- \fi
+%
+% \subsection{\themename outer theme}
+%
+% A |beamer| outer theme dictates the style of the frame elements traditionally
+% set outside the ``body'' of each slide, such as the frame title, the logo, the
+% footer, etc.
+%
+% \subsubsection{Package dependencies}
+%
+%    \begin{macrocode}
+\RequirePackage{pgfopts}
+%    \end{macrocode}
+%
+% \subsubsection{Definitions}
+% We define the command |\logsmall| to specify the logo that needs to be applied
+% displayed on all normal frames.
+%   \begin{macrocode}
+\def\logsmall{}
+\newcommand\smalllogo[1]{
+  \def\logsmall{#1}
+}
+%   \end{macrocode}
+%
+% \subsubsection{Options}
+%
+% \begin{macro}{numbering}
+%   Adds slide number to the bottom of each regular frame
+%   \begin{macrocode}
+\pgfkeys{
+  /trigon/outer/numbering/.cd,
+    .is choice,
+    none/.code=\setbeamertemplate{frame numbering}[none],
+    counter/.code=\setbeamertemplate{frame numbering}[counter],
+    fraction/.code=\setbeamertemplate{frame numbering}[fraction]
+}
+%   \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\trigon@outer@setdefaults}
+%   Sets default values for the outer theme options.
+%   \begin{macrocode}
+\newcommand{\trigon@outer@setdefaults}{
+  \pgfkeys{/trigon/outer/.cd,
+    numbering=counter
+  }
+}
+%   \end{macrocode}
+% \end{macro}
+%
+%
+% \subsubsection{Frame title}
+% \begin{macro}{frametitle}
+% Template for the frame title
+%   \begin{macrocode}
+\defbeamertemplate*{frametitle}{trigon}
+{
+  \vspace{-1pt}
+  \begin{beamercolorbox}[wd=\paperwidth,leftskip=0.05\paperwidth]{frametitle}
+  \vskip.4cm
+  \ifx\insertframesubtitle\@empty%
+      {\usebeamerfont{frametitle}\usebeamercolor[fg]{frametitle}\insertframetitle}%
+  \else%
+      {\usebeamerfont{frametitle}\usebeamercolor[fg]{frametitle}\insertframetitle}\\[-.25cm]
+      {\usebeamerfont{framesubtitle}\usebeamercolor[fg]{framesubtitle}\insertframesubtitle}%
+  \fi
+  \vskip.3cm
+  \end{beamercolorbox}
+}
+%   \end{macrocode}
+% \end{macro}
+%
+%
+% \subsubsection{Fame header}
+% \begin{macro}{headline}
+% Templates for the frame header
+%   \begin{macrocode}
+\defbeamertemplate{headline}{none}{}
+\defbeamertemplate*{headline}{logo}{
+\ifx\logsmall\@empty\else
+  \hfill\includegraphics[width=20pt]{\logsmall}\hspace{20pt}\vspace{-40pt}
+\fi
+}
+%   \end{macrocode}
+% \end{macro}
+%
+%
+% \subsubsection{Frame footer}
+% Define various template for frame footer and manage frame numbering.
+% \begin{macrocode}
+\setbeamertemplate{navigation symbols}{}
+
+\defbeamertemplate{frame footer}{none}{}
+\defbeamertemplate{frame footer}{custom}[1]{ #1 }
+\defbeamertemplate{frame numbering}{none}{}
+\defbeamertemplate{frame numbering}{counter}{\insertframenumber}
+\defbeamertemplate{frame numbering}{fraction}{
+  \insertframenumber/\inserttotalframenumber
+}
+
+\defbeamertemplate{footline}{plain}{%
+  \begin{beamercolorbox}[wd=\textwidth, sep=10pt]{page number in head/foot}%
+    \usebeamerfont{page number in head/foot}%
+    \usebeamercolor[fg]{page number in head/foot}%
+    \usebeamertemplate*{frame footer}
+    \hfill%
+    \usebeamertemplate*{frame numbering}
+  \end{beamercolorbox}%
+}
+
+\setbeamertemplate{footline}[plain]
+% \end{macrocode}
+%
+% \begin{macro}{appendix}
+%    Removes page numbering and per-slide progress bars when |\appendix| is
+%    called. This makes it easier to include additional ``backup slides'' at
+%    the end of the presentation, especially in conjunction with the package
+%    |appendixnumberbeamer|.
+%    \begin{macrocode}
+\AtBeginDocument{%
+  \apptocmd{\appendix}{%
+    \pgfkeys{%
+      /trigon/outer/.cd,
+      numbering=none}
+    }{}{}
+}
+%   \end{macrocode}
+% \end{macro}
+%
+% \subsubsection{Process package options}
+%
+%    \begin{macrocode}
+\trigon@outer@setdefaults
+\ProcessPgfPackageOptions{/trigon/outer}
+%    \end{macrocode}
+%
+% \iffalse
+%</package>
+% \fi
+% \Finale
+\endinput