% Copyright 2015 by Facundo Muñoz
%
% This file may be distributed and/or modified
%
% 1. under the LaTeX Project Public License and/or
% 2. under the GNU Public License.
%


\ProvidesPackage{beamerthemesimple}

%\def\beamer@simplecolor{gris}
%\DeclareOptionBeamer{color}{\beamer@simplecolor=#1}
%\ExecuteOptionsBeamer{gris}
%\ProcessOptionsBeamer

\usepackage{tikz}
\usetikzlibrary{arrows,shapes,trees,positioning,fadings}

\input xkeyval

\newcommand<>{\includeoverlaygraphics}[2][]
{
  \begin{tikzpicture}
    \alt#3{\node[opacity=1] {\includegraphics[#1]{#2}};}
          {\node[opacity=.15] {\includegraphics[#1]{#2}};}
  \end{tikzpicture}
}

% These define macros \KV@setwatermark@hoffset that take one argument
% which is processed by the last piece of codes into braces
\def\@hos{}
\def\@vos{}
\def\@alpha{} % This one does not work. Why?
\define@key{setwatermark}{hoffset}[\def\@hos{.}]{\def\@hos{\hspace*{#1}}} 
\define@key{setwatermark}{voffset}[\def\@vos{.}]{\def\@vos{\vspace*{#1}}} 
\define@key{setwatermark}{alpha}[\def\@alpha{0.7}]{\def\@alpha{#1}} 

\def\setwatermark{\@ifnextchar[\@setwatermark{\@setwatermark[]}}
\def\@setwatermark[#1]#2{%
  \setkeys{setwatermark}{#1}%
  \def\@watermark{#2}
}
% \newcommand{\setwatermark}[1]{\def\@watermark{#1}}
\setwatermark{}   % Empty initialization


\mode<presentation>

  % define margin
  \def\marginsize{0.4cm}

  % http://www.colorcombos.com/color-scheme-275.html
  \definecolor{destacado}{HTML}{515151} % gris oscuro
  \definecolor{normal}{HTML}{797979}  % gris medio
  \definecolor{fondo}{HTML}{e6e6e6}  % gris claro
  
  \definecolor{logo}{HTML}{8E8E8E} % el gris del logo
  
  % para el logo en el footer
  \def\logoimage{%
      \raisebox{-1.1ex}{\includegraphics[width=3.3ex,trim=2.7 2.7 2.7 2.7]{\inserttitlegraphic}}%
  }
 
  \setbeamercolor{normal text}{bg=white,fg=normal}
  \setbeamercolor*{block title}{bg=fondo,fg=destacado}
  \setbeamercolor*{block body}{bg=fondo,fg=normal}
  \setbeamercolor{alerted text}{fg=black}
  
  \usetheme{default}
%  \usecolortheme[named=gris]{structure}
  \usecolortheme[named=destacado]{structure}
  \usefonttheme{structurebold}

  % overlays semitransparentes
  \setbeamercovered{transparent}
  
  % customize title page
  \def\twitter#1{\def\@twitter{\href{https://twitter.com/#1}{@#1}}}
  \newcommand{\inserttwitter}{\@twitter}
  
  \def\titlecontent{
    \usebeamerfont{title}\usebeamercolor[destacado]{title}\inserttitle
    \par
    \usebeamerfont{subtitle}\usebeamercolor[destacado]{subtitle}\insertsubtitle
    \par
    \bigskip
    \usebeamerfont{author}\usebeamercolor[normal]{author}\insertauthor
    \par
    \usebeamerfont{author}\usebeamercolor[normal]{author}\inserttwitter
    \par
    \bigskip
    \usebeamerfont{institute}\usebeamercolor[normal]{institute}\insertinstitute
    \par
    \usebeamerfont{date}\usebeamercolor[normal]{date}\insertdate
    \par
    % webpage plug
    \usebeamerfont{url}\usebeamercolor[normal]{url}\href{https://gul.uc3m.es}{gul.uc3m.es}
    \par
  }
  
  \setbeamertemplate{title page}{%
    \hyphenpenalty 10000
    \hspace*{-\marginsize}\parbox[c][\paperheight][c]{\paperwidth}{
        \begin{center}
            \begin{tikzpicture}
                \node[opacity=0.3] {\includegraphics[height=7cm]{\inserttitlegraphic}};
                \node[align=center, text width=0.95\paperwidth]{
                    \titlecontent
                };
            \end{tikzpicture}
        \end{center}
    }
    
  }
  
  % footer (contador de diapos, nombre jornadas)
  \setbeamercolor{section in foot}{fg=fondo, bg=logo}
  \setbeamertemplate{footline}{
      \leavevmode%
      \hbox{%
      \begin{beamercolorbox}[wd=.023\paperwidth,ht=2.25ex,dp=1ex,left]{section in foot}%
        \usebeamerfont{logo in head/foot}\logoimage
      \end{beamercolorbox}%
      \begin{beamercolorbox}[wd=.377\paperwidth,ht=2.25ex,dp=1ex,center]{section in foot}%
        \usebeamerfont{institute in head/foot}\insertshortinstitute
      \end{beamercolorbox}%
      \begin{beamercolorbox}[wd=.5\paperwidth,ht=2.25ex,dp=1ex,center]{section in foot}%
        \usebeamerfont{title in head/foot}\insertshorttitle\hspace*{3em}
      \end{beamercolorbox}}%
      \begin{beamercolorbox}[wd=.1\paperwidth,ht=2.25ex,dp=1ex,center]{section in foot}%
        \usebeamerfont{title in head/foot}\insertframenumber{} / \inserttotalframenumber\hspace*{1ex}
      \end{beamercolorbox}
      \vskip0pt%
  }

  % eliminar íconos de nav.
  \setbeamertemplate{navigation symbols}{}
  
  % bloques
  \setbeamertemplate{blocks}[rounded][shadow=false]

  % especificación global para listas
  %\beamerdefaultoverlayspecification{<+-| alert@+>}
  
  % márgenes
  \setbeamersize{text margin left=\marginsize,text margin right=\marginsize}
  
  \setbeamertemplate{background}{
  \parbox[c][\paperheight]{\paperwidth}{%
    \vfill \hfill 
    \begin{tikzpicture}
      %\node[opacity=\@alpha]  % not working. why?
      \node[opacity=.03]
      {
        \@watermark
      };
    \end{tikzpicture}
    \@hos
    
    \@vos
  }
} 

\mode
<all>