beamerouterthemepolimi.sty

\mode<presentation>

\newlength{\xshift}
\setlength{\xshift}{0.05\paperwidth}

% Header.
\defbeamertemplate*{frametitle}{polimi}
{
    \begin{tikzpicture}[overlay, remember picture, text depth=.25ex]
    \node at ([shift={(\xshift, -0.6)}] current page.north west) [anchor=south west, inner sep=0pt]
    {
        \ifhidesechead
        {\small\phantom{Section}\leavevmode}
        \else
        {\small \insertsectionhead \ifx\insertsubsection\empty\else\ - \insertsubsectionhead\fi\leavevmode}
        \fi
    };
    \node at ([shift={(\xshift, -1.25)}] current page.north west) [anchor=south west, inner sep=0pt]
    {
        \insertframetitle
    };
    \end{tikzpicture}
    \vspace{1.1cm}
}

% Header.
\defbeamertemplate*{frametitle}{plain}{}

% Use frametitle template even if \frametitle is empty.
\patchcmd{\endbeamer@frameslide}{\ifx\beamer@frametitle\@empty}{\iffalse}{}{\errmessage{Failed to patch frametitle.}}

\defbeamertemplate{headline}{frame number}
{
    \ifnum\c@framenumber>0
        \begin{tikzpicture}[overlay, remember picture, text depth=.25ex]
        \node at ([shift={(-0.5\xshift, -1.25)}] current page.north east) [anchor=south east, inner sep=0pt]
        {
            {\color{white} \tiny \insertframenumber/\inserttotalframenumber}
        };
        \end{tikzpicture}
    \fi
}

% Footer.
\defbeamertemplate{footline}{polimi}{
    \begin{minipage}[b][1cm][c]{\paperwidth}
        \ifnum\c@framenumber>0
            \begin{tikzpicture}[overlay, remember picture]
            \node at ([shift={(\xshift, 0.5)}] current page.south west) [anchor=west, inner sep=0pt]
            {
                {\small\color{white} May 20, 2020}
            };
            \node at ([shift={(-0.5\xshift, 0.5)}] current page.south east) [anchor=east, inner sep=0pt]
            {
                \includegraphics[height=\baselineskip]{logo_bandiera.png}
            };
            \end{tikzpicture}
        \fi
    \end{minipage}
}

\setbeamertemplate{footline}[polimi]

% Enable nonumber option.
\BeforeBeginEnvironment{frame}{
    \setbeamertemplate{background}[polimi]
    \setbeamertemplate{frametitle}[polimi]
    \setbeamertemplate{headline}[frame number]
}

\makeatletter
\define@key{beamerframe}{nonumber}[true]{
    \setbeamertemplate{headline}{}
    \addtocounter{framenumber}{-1}
}
\makeatother

% Enable plain option.
\makeatletter
\define@key{beamerframe}{plain}[true]{
    \ifnum\c@framenumber>0
        \setbeamertemplate{background}[footer]
        \setbeamertemplate{frametitle}[plain]
        \setbeamertemplate{headline}{}
        \addtocounter{framenumber}{-1}
    \fi
}
\makeatother