%% talk-simple.sty -- (talk-simple.sty) style file
%% A style package for the talk class
%% Author: Martin Wiebusch
%%
%% This file may be distributed and/or modified under the
%% conditions of the LaTeX Project Public License, either version 1.3
%% of this license or (at your option) any later version.
%% The latest version of this license is in
%%    https://www.latex-project.org/lppl/lppl-1-3/
%% and version 1.3 or later is part of all distributions of LaTeX
%% version 2003/12/01 or later.

\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{talk-simple}

% Use the cmbright font.
\RequirePackage{cmbright}

\ProcessOptions\relax

% Create a unit length for the slides.
% You can easily resize your slides by changing this.
\newlength{\sim@unit}
\setlength{\sim@unit}{1in}

% Set the slide size and magnification.
% (The magnification factor is only used in slides mode.)
\@slidesize{8\sim@unit}{4.5\sim@unit}
\slidesmag{1.2}

% Command for changing the title color.
% This defines a color sim@title which we use inside \@newlayout.
\newcommand{\titlecolor}[1]{\definecolor{sim@title}{rgb}{#1}}
\titlecolor{0,0,0.7}

% Create the \comment command.
% The comment text appears on the title slide below the author.
% Use it, for example for \comment{in collaboration with...}
\def\@comment{}
\newcommand{\comment}[1]{\gdef\@comment{#1}}

% Create the \titlelogo command.
\def\@titlelogo{}
\newcommand{\titlelogo}[1]{\gdef\@titlelogo{#1}}

% Define the default slide style.
\@newlayout{default}{%
  % All you have to do is redefine the \@makeslide command.
  \renewcommand{\@makeslide}{%
    % We start with the current point in the top-left corner of the slide.
    %
    % If you want graphical elements like a background image you can place
    % them here using the \shiftbox command. \shiftbox doesn't move the current
    % point, so you can use \shiftbox as often as you like without messing up
    % the relative positioning.
    %
    % Here we just put the title and body of the slide in a minipage and
    % use a single \shiftbox command to position the minipage some distance away
    % from the edges of the slide.
    \shiftbox[tl]{0.2\sim@unit}{-0.2\sim@unit}{%
      \begin{minipage}[t][4.1\sim@unit][s]{7.6\sim@unit}%
        % Typeset the title in large font and the desired color.
        {\parskip=0pt\color{sim@title}\LARGE\@slidetitle\par}%
        % Add some glue so that the body appears vertically centered
        % in the remaining space.
        \vspace*{1.5em plus 1fil}%
        % Typeset the body
        \@slidebody%
        \vspace*{0pt plus 1fil}%
      \end{minipage}%
    }%
  }%
}

% Define the 'notitle' slide style.
% Same as above, but now we just don't print the title.
\@newlayout{notitle}{%
  \renewcommand{\@makeslide}{
    \shiftbox[tl]{0.2\sim@unit}{-0.2\sim@unit}{%
      \begin{minipage}[t][4.1\sim@unit][s]{7.6\sim@unit}%
        \vspace*{0pt plus 1fil}%
        \@slidebody%
        \vspace*{0pt plus 1fil}%
      \end{minipage}%
    }%
  }%
}

% Define the 'onlytitle' slide style.
% Same again, but now we just print the title centered vertically and
% horizontally
\@newlayout{onlytitle}{%
  \renewcommand{\@makeslide}{
    \shiftbox[tl]{0.2\sim@unit}{-0.2\sim@unit}{%
      \begin{minipage}[t][4.1\sim@unit][s]{7.6\sim@unit}%
        \vspace*{0pt plus 1fil}%
        \centering\parskip=0pt\color{sim@title}\LARGE\@slidetitle\par%
        \vspace*{0pt plus 1fil}%
      \end{minipage}%
    }%
  }%
}

% Define the \makeslidetitle command.
% Somewhat confusingly, the best style for this is the 'notitle' style.
\newcommand{\maketitleslide}{%
  \begin{slide}[notitle]{}
    \centering%
    {\color{sim@title}\LARGE\@title\par}\vspace{3em}%
    {\large\@author\par\vspace{0.5em}{\small\@comment}\par\vspace{1.5em}%
     \@titlelogo\par}%
    \vspace{1.5em}%
    {\large\@date\par}
  \end{slide}%
}

% Redefine the \@makenotesslide command.
% When printing notes we want to draw a box around our slides and
% shrink them a bit so that they fit on the page.
\renewcommand{\@makenotesslide}{%
  \centering\fboxsep=0pt\fbox{\scalebox{0.7}{\@slidebox}}\par\bigskip%
}

% Let's also make the page a bit wider when printing notes.
\@ifnotes{%
  \addtolength{\textwidth}{1in}
  \addtolength{\oddsidemargin}{-0.5in}
}{}

% Set the default slide style to 'default'.
\layout{default}

% Some final tweaks. Paragraph indentations don't look that great on slides,
% so let's get rid of them. Instead we use \setparskip to insert some space
% between paragraphs. The \sloppy command tells TeX to be a bit more
% relaxed about overfull or underfull boxes.
\setlength{\parindent}{0pt}
\setparskip{1.5ex plus0.5ex minus0.5ex}
\sloppy

% Let's also redefine the \emph command to use red colour rather than italic
% font to emphasise things.
\definecolor{emphcolor}{rgb}{0.7,0,0}
\renewcommand{\emph}[1]{\textcolor{emphcolor}{#1}}