%%
% @file beamerthemeTUW.sty
% @date 2016-08-30
% @author Wolfgang Puffitsch, Denise Ratasich
%
% @brief Beamer LaTeX template matching the corporate design of TU Wien.
%%

\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{beamerthemeTUW}[2016/08/30 Beamer template that fits the TU Wien corporate design (adopted styles from powerpoint presentation template in CD manual)]

\RequirePackage{graphicx}
\RequirePackage{tikz}

\def\beamer@tuwDefault{default}
\def\beamer@tuwPlain{plain}
\def\beamer@tuwSidebar{sidebar}
\def\beamer@tuwHelvetica{helvetica}
\def\beamer@tuwNoImage{none}
\def\beamer@tuwLogo{TU_Logo}
\def\beamer@tuwLogoWhite{TU_Logo_white}

%%% options
% The user may choose other fonts (TU Wien CD says to use helvetica).
\DeclareOptionBeamer{font}{\def\beamer@tuwFont{#1}}
% Another outer theme may be chosen, however it may not fit the TU Wien colors.
\DeclareOptionBeamer{outer}{\def\beamer@tuwOuter{#1}}
% Width of the sidebar.
\DeclareOptionBeamer{width}{\def\beamer@tuwWidth{#1}}
% Background image of TU Wien building on title page.
\newif\ifbeamer@tuwBackground
\DeclareOptionBeamer{tuw_background}{\beamer@tuwBackgroundtrue}
% Individual background image on title page.
\DeclareOptionBeamer{tuw_image}{\def\beamer@tuwImage{#1}}
% White logo (if tuw_image is dark the logo should be set to be white).
\newif\ifbeamer@tuwWhiteLogo
\DeclareOptionBeamer{tuw_whitelogo}{\beamer@tuwWhiteLogotrue}
% Print frame title beside the logo to save space.
\newif\ifbeamer@tuwFrametitleToTop
\DeclareOptionBeamer{tuw_frametitletotop}{\beamer@tuwFrametitleToToptrue}

% defaults
\ExecuteOptionsBeamer{outer=default}
\ExecuteOptionsBeamer{width=1.6cm}
\ExecuteOptionsBeamer{font=\familydefault}
\beamer@tuwBackgroundfalse
\ExecuteOptionsBeamer{tuw_image=none}
\beamer@tuwWhiteLogofalse
\beamer@tuwFrametitleToTopfalse

\ProcessOptionsBeamer

\ifx\beamer@tuwFont\beamer@tuwHelvetica
\RequirePackage{helvet}
\fi

\mode<presentation>

%%% colors
% For some reason the logo is not in TU-blue (0,102,153). The powerpoint
% presentation has TU-blue as background and the logo with a different color
% (doesn't look nice). We align the TU-blue to the logo, like in the CD manual.
\definecolor{tuwBlue}{RGB}{0,116,178}
\definecolor{tuwGray}{RGB}{102,102,102}
\definecolor{iceBlue}{RGB}{222,231,236}

\def\tuwBlue{tuwBlue}
\def\tuwGray{tuwGray}
\def\iceBlue{iceBlue}
\def\tuwLightBlue{tuwBlue!20!white}
\def\tuwMediumBlue{tuwBlue!45!white}
\def\tuwDarkBlue{tuwBlue!70!black}
\def\alertred{red!50!black}

% content page
\setbeamercolor{normal text}{fg=black,bg=white}
\setbeamercolor{alerted text}{fg=\alertred}
\setbeamercolor{structure}{fg=\tuwBlue}
\setbeamercolor{frametitle}{fg=black}

\setbeamercolor{palette primary}{fg=\tuwDarkBlue,bg=\tuwLightBlue}
\setbeamercolor{palette secondary}{fg=\tuwBlue!50!black,bg=\tuwMediumBlue}
\setbeamercolor{palette tertiary}{fg=white,bg=\tuwBlue}

\setbeamercolor{section in toc}{parent=normal text}
\setbeamercolor{subsection in toc}{parent=section in toc}

\setbeamercolor{block title}{fg=white, bg=\tuwBlue}
\setbeamercolor{block title example}{fg=white, bg=\tuwBlue}
\setbeamercolor{block title alerted}{fg=white, bg=\alertred}
\setbeamercolor{block body}{bg=\iceBlue}
\setbeamercolor{block body example}{parent=block body}
\setbeamercolor{block body alerted}{parent=block body, fg=\alertred}

\setbeamercolor{title in head/foot}{fg=\tuwBlue}
\setbeamercolor{page number in head/foot}{fg=\tuwBlue}
\setbeamercolor{footline}{fg=\tuwBlue}

% color difference of default and other outer styles
\ifx\beamer@tuwOuter\beamer@tuwDefault
% default style - this is the CD of TU Wien
% title page
\setbeamercolor{title}{fg=white}
\setbeamercolor{subtitle}{fg=white}
\setbeamercolor{author}{fg=white}
\setbeamercolor{institute}{fg=white}
\setbeamercolor{date}{fg=white}
% content page
% keep defaults (black)
\else
% other outer styles (e.g., sidebar)
% title page
\setbeamercolor{title}{fg=\tuwGray}
\setbeamercolor{subtitle}{fg=\tuwGray}
\setbeamercolor{author}{fg=black}
\setbeamercolor{institute}{fg=black}
\setbeamercolor{date}{fg=black}
% content page
\setbeamercolor{frametitle}{fg=\tuwGray}
\setbeamercolor{headline}{fg=\tuwGray}
\setbeamercolor{footline}{fg=\tuwGray}
\fi

% sidebar
\setbeamercolor{sidebar}{bg=\tuwBlue,fg=white}
\setbeamercolor{palette sidebar primary}{fg=\tuwDarkBlue,bg=\tuwLightBlue}
\setbeamercolor{palette sidebar secondary}{fg=\tuwDarkBlue,bg=\tuwLightBlue}
\setbeamercolor{palette sidebar tertiary}{fg=white,bg=\tuwBlue}
\setbeamercolor{title in sidebar}{fg=white,bg=\tuwBlue}
\setbeamercolor{section in sidebar}{fg=\tuwDarkBlue}
\setbeamercolor{section in sidebar shaded}{fg=white,bg=\tuwBlue}
\setbeamercolor{subsection in sidebar}{fg=\tuwDarkBlue}
\setbeamercolor{subsection in sidebar shaded}{fg=white,bg=\tuwBlue}

%%% fonts

% font weight
\setbeamerfont{title}{series=\bfseries}
\setbeamerfont{author}{series=\mdseries}
\setbeamerfont{institute}{series=\mdseries}
\setbeamerfont{date}{series=\mdseries}
\setbeamerfont{frametitle}{series=\mdseries}
\setbeamerfont{headline}{series=\mdseries}
\setbeamerfont{footline}{series=\mdseries}

% font size difference of default and other outer styles
\ifx\beamer@tuwOuter\beamer@tuwDefault
% default style - this is the CD of TU Wien
\setbeamerfont{title}{size=\huge}
\setbeamerfont{author}{size=\normalsize}
\setbeamerfont{institute}{size=\normalsize}
\setbeamerfont{date}{size=\normalsize}
\setbeamerfont{frametitle}{size=\Large}
\setbeamerfont{framesubtitle}{size=\large}
\setbeamerfont{headline}{size=\scriptsize}
\setbeamerfont{footline}{size=\scriptsize}
\else
% other outer styles (e.g., sidebar)
% keep defaults
\fi

\setbeamerfont{section in toc}{parent=normal text}
\setbeamerfont{subsection in toc}{parent=section in toc}

% sidebar
\setbeamerfont{title in sidebar}{series=\bfseries}
\setbeamerfont{section in sidebar}{series=\bfseries,size=\tiny}
\setbeamerfont{subsection in sidebar}{size=\tiny}

%%% outer
\setbeamersize{text margin left=1.2cm}
\setbeamersize{text margin right=1.5cm}
\beamertemplatenavigationsymbolsempty


\ifx\beamer@tuwOuter\beamer@tuwDefault
% default outher theme - this is the CD of TU Wien

% background
\setbeamertemplate{background}{
  \begin{tikzpicture}
    \useasboundingbox (0,0) rectangle(\the\paperwidth,\the\paperheight);
    % title page
    \ifbeamer@tuwBackground % tu building background selected
    \node[anchor=south west] (background) at (-0.15cm,-0.15cm) {\includegraphics[width=1.01\paperwidth]{TU_Background}};
    \else\ifx\beamer@tuwImage\beamer@tuwNoImage % no background image specified
    \fill[white] (0,0) rectangle (\the\paperwidth,\the\paperheight);
    \else % individual background image
    \node[anchor=north west] (background) at (-0.15cm,-0.15cm) {\includegraphics[width=1.01\paperwidth]{\beamer@tuwImage}};
    \fi\fi
    \fill[\tuwBlue, rounded corners=0.5cm] (-1cm,-1cm) rectangle (\paperwidth-0.5cm,\paperheight-3cm);
    \ifbeamer@tuwWhiteLogo % white logo option specified
    \node[anchor=north west] (logo) at (0.3cm,\paperheight-0.1cm) {\includegraphics[height=2cm]{\beamer@tuwLogoWhite}};
    \else
    \node[anchor=north west] (logo) at (0.2cm,\paperheight-0.2cm) {\includegraphics[height=2cm]{\beamer@tuwLogo}};
    \fi
    % content page
    \ifnum\thepage>1\relax%
    \fill[\iceBlue] (0,0) rectangle (\the\paperwidth,\the\paperheight);
    \fill[white, rounded corners=0.5cm] (-1cm,-1cm) rectangle(\paperwidth-0.4cm,\paperheight-0.8cm);
    \node[anchor=west] (logo) at (0.3cm,\paperheight-0.4cm) {\includegraphics[height=0.5cm]{TU_Signet}};
    \fi
  \end{tikzpicture}
}

% title page
\def\beamer@titlepageLeft{1.6cm}
\setbeamertemplate{title page}{
  \vskip 4cm%
  \begin{beamercolorbox}[leftskip=\beamer@titlepageLeft]{title}%
    \usebeamerfont{title}\inserttitle%
  \end{beamercolorbox}%
  \vskip 0.5cm%
  \begin{beamercolorbox}[leftskip=\beamer@titlepageLeft]{subtitle}
    \usebeamerfont{subtitle}\insertsubtitle%
  \end{beamercolorbox}
  \vskip 0.25cm%
  \vfill%
  \begin{beamercolorbox}[leftskip=\beamer@titlepageLeft]{author}
    \usebeamerfont{author}\insertauthor%
  \end{beamercolorbox}
  \begin{beamercolorbox}[leftskip=\beamer@titlepageLeft]{date}
    \usebeamerfont{date}\insertdate%
  \end{beamercolorbox}
}

% frametitle
\setbeamertemplate{frametitle}
{%
  \ifbeamer@tuwFrametitleToTop % frametitle should be printed beside the logo
  % vbox to keep the baseline
  \vbox{}\vskip -0.43cm%
  \else
  \vbox{}\vskip 0.7cm%
  \fi
  \begin{beamercolorbox}[leftskip=0cm]{frametitle}
    \usebeamerfont{frametitle}\insertframetitle%
    \ifbeamer@tuwFrametitleToTop
    \vbox{}\vskip 0.3cm%
    \else
    \vbox{}\vskip 0.2cm%
    \fi
    \usebeamerfont{framesubtitle}\insertframesubtitle%
  \end{beamercolorbox}
}

% footline
\setbeamertemplate{footline}{%
  \vspace{0.1cm}
  \ifnum\thepage>1
    \begin{beamercolorbox}[wd=\paperwidth,ht=2.25ex,dp=1ex]{footline}
      \hskip 1.2cm%
      \usebeamerfont{footline}\insertshortdate%
      \hfill%
      \insertshorttitle, \insertshortauthor%
      \hfill%
      \insertframenumber\:/\:\inserttotalframenumber%
      \hspace*{1.5cm}%
    \end{beamercolorbox}
  \else
    \begin{beamercolorbox}[wd=\paperwidth,ht=2.25ex,dp=1ex,center]{}%
        % empty environment to raise height
    \end{beamercolorbox}
  \fi
  \vspace{0.1cm}
}

\else\ifx\beamer@tuwOuter\beamer@tuwSidebar
% sidebar outer theme
\useoutertheme[width=\beamer@tuwWidth,height=0pt]{\beamer@tuwOuter}

% footline
\setbeamertemplate{footline}{
  \ifnum\thepage>1
  \vspace{-1cm}
  \hfill{\scriptsize\insertframenumber\:/\:\inserttotalframenumber~~}
  \vspace{0.1cm}
  \fi
}
\else
\useoutertheme{\beamer@tuwOuter}
\fi\fi % if outer=default or outer=sidebar


%%% inner
\ifx\beamer@tuwOuter\beamer@tuwDefault
\setbeamertemplate{itemize items}[circle]
\else
% defaults
\fi % if outer=default

\setlength{\parskip}{6pt}

% blocks
\setbeamertemplate{blocks}[rounded]
\pgfdeclareverticalshading{bmb@transition}{\the\paperwidth}{color(0pt)=(\iceBlue); color(3.0pt)=(\iceBlue)}

\setbeamercovered{invisible}

% emphasize
\renewcommand<>{\emph}[1]{{\only#2{\color{\tuwBlue}}#1}}

\hypersetup{colorlinks=true,linkcolor=fg,citecolor=\tuwGray,urlcolor=\tuwGray}

\mode<all>