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% Copyright (C) 2018 Pasquale Claudio Africa.
%
% This file is part of beamerthemefocus.
%
% beamerthemefocusis free software: you can redistribute it and/or modify
% it under the terms of the GNU General Public License as published by
% the Free Software Foundation, either version 3 of the License, or
% (at your option) any later version.
% 
% beamerthemefocus is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
% GNU General Public License for more details.
% 
% You should have received a copy of the GNU General Public License
% along with beamerthemefocus. If not, see <http://www.gnu.org/licenses/>.

\mode<presentation>

% Main background.
\defbeamertemplate*{background}{focus}{
    % Titlepage.
    \ifnum\c@framenumber=0
        \begin{tikzpicture}[overlay, remember picture]
            \fill[color=background] (current page.north west) rectangle (current page.south east);
        \end{tikzpicture}
    \fi
}

% Focus frame background.
\defbeamertemplate{background}{focusframe}{
    \ifnum\c@framenumber>0
        \begin{tikzpicture}[overlay, remember picture]
            \fill[color=main] (current page.north west) rectangle (current page.south east);
        \end{tikzpicture}
    \fi
}

% Title page.
\defbeamertemplate*{title page}{focus}[1][]
{
    \begin{tikzpicture}[overlay, remember picture]
        \fill[color=main] (current page.north west) rectangle ([shift = {(0, -0.45\paperheight)}] current page.north east);
    \end{tikzpicture}
    
    \vspace{-1.65\baselineskip}
    \begin{minipage}[b][0.35\paperheight]{\textwidth}
        \vspace{\baselineskip}
        \usebeamerfont{title}
        \usebeamercolor[fg]{frametitle}
        \inserttitle
    \end{minipage}
    
    \begin{minipage}[t][0.1\paperheight]{\textwidth}
        \usebeamerfont{subtitle}
        \usebeamercolor[fg]{frametitle}
        \insertsubtitle
    \end{minipage}
    
    % Set the title graphic in a zero-height box, so that
    % the position of other elements is not affected.
    \vbox to 0pt {
        \raggedleft
        \inserttitlegraphic
    }
    
    \begin{minipage}[t]{\textwidth}
        \usebeamerfont{author}
        \insertauthor
    \end{minipage}
    
    \vspace*{\baselineskip}
    \begin{minipage}[t]{\textwidth}
        \usebeamerfont{institute}
        \insertinstitute
    \end{minipage}
    
    \vspace*{\baselineskip}
    \begin{minipage}[t]{\textwidth}
        \usebeamerfont{date}{\insertdate}
    \end{minipage}
    
    \vspace*{5\baselineskip}
    
    \addtocounter{framenumber}{-1}
}

% Section page.
\defbeamertemplate*{section page}{focus}{
    \begin{tikzpicture}[overlay, remember picture]
        \fill[color=main] (current page.north west) rectangle ([shift = {(0, -0.45\paperheight)}] current page.north east);
    \end{tikzpicture}
    
    \vspace{-2\baselineskip}
    \begin{minipage}[b][0.45\paperheight]{\textwidth}
        \usebeamerfont{sectiontitle}
        \usebeamercolor[fg]{frametitle}
        \let\hyperlink\@secondoftwo\insertsection
    \end{minipage}
    
    \begin{minipage}[t][0.55\paperheight]{\textwidth}
    \end{minipage}
}
\setbeamertemplate{section page}[focus]

\AtBeginSection{
    \begin{frame}[plain, noframenumbering]{}
        \sectionpage
    \end{frame}
}

% Shift footnotes to prevent overlap with footline.
\addtobeamertemplate{footnote}
{\ifnum\footlineheight>0\vspace{-0.55\footlineheight}\fi}
{\ifnum\footlineheight>0\vspace{0.55\footlineheight}\fi}

\renewcommand*{\footnoterule}
{
    \kern -3pt
    \hrule width 2in height 0.4pt
    \ifnum\footlineheight>0
        \kern 0.55\footlineheight
    \fi
    \kern 2.6pt
}

\mode<all>