beamerinnerthemebonbon.sty

\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{beamerinnerthemebonbon}[2017/07/30 Bonbon inner theme]

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% Required packages and configuration.                                         %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\RequirePackage{calc}
\RequirePackage{tikz}
\RequirePackage{xkeyval}

% Configure libraries to be imported by TikZ.
\usetikzlibrary{
  calc,
  arrows
}


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Variables used to calculate slide dimensions and progress bar width.         %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

% Creates a new length and initializes it with the specified dimension.
\newcommand{\declength}[2]{
  \newlength{#1}
  \setlength{#1}{#2}
}

% The separation lengths that determine by how much the slide content is shifted
% to the right.
\declength{\smlsep}{0.4cm}
\declength{\bigsep}{0.8cm}

% The thickness with which the lines are drawn.
\declength{\linethick}{0.4pt}

% The template uses two page dimensions, the smaller one for title pages, and
% the larger one for slide content.
\declength{\smlpagewidth}{\paperwidth - (\bigsep * 2)}
\declength{\smlpageheight}{\paperheight - (\bigsep * 2)}
\declength{\bigpagewidth}{\paperwidth - (\smlsep * 2)}
\declength{\bigpageheight}{\paperheight - (\smlsep * 2)}

% The template features a progress bar which shows indicates the current
% presentation progress. It comes in two flavours, one that fits \smlpagewidth
% and the other that fits \bigpagewidth.
% The two macros below calculate the length of the progress bar in both cases.
\newlength{\smlproglen}
\newlength{\bigproglen}
%\declength{\smlprogtotal}{\smlpagewidth - \linethick}
%\declength{\bigprogtotal}{\bigpagewidth - \linethick}
%\newcommand{\updatesmlprog}{
%  \ifnum\inserttotalframenumber=1\relax
%    \setlength{\smlproglen}{0pt}
%  \else
%    \setlength{\smlproglen}{(\smlprogtotal * (\insertframenumber - 1)) / (\inserttotalframenumber - 1)}\relax
%  \fi
%}
%\newcommand{\updatebigprog}{
%  \ifnum\inserttotalframenumber=1\relax
%    \setlength{\bigproglen}{0pt}
%  \else
%    \setlength{\bigproglen}{(\bigprogtotal * (\insertframenumber - 1)) / (\inserttotalframenumber - 1)}\relax
%  \fi
%}

% TODO: Fix this big and nasty hack! But I was pressed with time :(
\declength{\smlprogtotal}{((\smlpagewidth - \linethick) / 100) * 100}
\declength{\bigprogtotal}{((\bigpagewidth - \linethick) / 100) * 100}
\newcommand{\updatesmlprog}{
  \ifnum\inserttotalframenumber=1\relax
    \setlength{\smlproglen}{0pt}
  \else
    \setlength{\smlproglen}{(((\smlprogtotal / 100) * (\insertframenumber - 1)) / (\inserttotalframenumber - 1)) * 100}\relax
  \fi
}
\newcommand{\updatebigprog}{
  \ifnum\inserttotalframenumber=1\relax
    \setlength{\bigproglen}{0pt}
  \else
    \setlength{\bigproglen}{(((\bigprogtotal / 100) * (\insertframenumber - 1)) / (\inserttotalframenumber - 1)) * 100}\relax
  \fi
}
% TODO: End nasty hack!

\def\fineprint#1{\gdef\insertfineprint{#1}}
\fineprint{}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Inner template styles.                                                       %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\setbeamertemplate{itemize items}{\textbullet}
\setbeamertemplate{description item}{\insertdescriptionitem\hfill}
\setbeamertemplate{caption}{\insertcaption}
\setbeamertemplate{caption label separator}{}

\setbeamertemplate{title page}{%

  % Add this to remove the white top border that appears.
  \nointerlineskip

	\begin{beamercolorbox}[wd=\paperwidth, ht=\paperheight, sep=\bigsep]{title page}
    \begin{tikzpicture}

		  % Set the smaller size of slide as the canvas over which we will draw.
			\useasboundingbox (0, 0) rectangle (\smlpagewidth, \smlpageheight);

      % Draw title, subtitle, author and date text.
			\node [anchor=west, rotate=0, text width=\smlpagewidth] at (current bounding box.west) [font={\usebeamerfont{title}\usebeamercolor[fg]{title}}] (title) {\inserttitle};
			\node [anchor=west, yshift=-0.0cm] at (title.south west) [font={\usebeamerfont{subtitle}\usebeamercolor[fg]{subtitle}}] (subtitle) {\insertsubtitle};
			%\node [anchor=south west, inner ysep=0] at (current bounding box.south west) [font={\usebeamerfont{subsubtitle}\usebeamercolor[fg]{subsubtitle}}] (author) {\insertauthor~$\cdot$~\insertdate};
      \node [anchor=south west, inner ysep=0] at (current bounding box.south west) [font={\usebeamerfont{subsubtitle}\usebeamercolor[fg]{subsubtitle}}] (fineprint) {\tiny\insertfineprint};
      \node [anchor=south west, inner ysep=4pt] at (fineprint.north west) [font={\usebeamerfont{subsubtitle}\usebeamercolor[fg]{subsubtitle}}] (institute) {\usebeamerfont{institute}\insertinstitute};
      \node [anchor=south west, inner ysep=0] at (institute.north west) [font={\usebeamerfont{subsubtitle}\usebeamercolor[fg]{subsubtitle}}] (author) {\insertdate~$\cdot$~\insertauthor};
	  \end{tikzpicture}
	\end{beamercolorbox}
}

\setbeamertemplate{frametitle}{%

  % Update the length of widest (big) progress bar to be drawn. One should be
  % reminded that this macro needs to be invoked in each template, as length
  % variables in LaTeX are locally-scoped.
  \updatebigprog

  % Apply the beamer color, and use it to create a new FG color for it. This
  % is used to draw the progress bar in the same same color as the frame title
  % text.
  % The color was not hardcoded in order to make it possible to change this
  % indirectly by setting the frametitle color.
  \usebeamercolor{frametitle}
	\colorlet{progfg}{fg}

  % Add this to remove the white top border that appears.
	\nointerlineskip

	\begin{beamercolorbox}[wd=\paperwidth, ht=1.4cm, sep=\smlsep]{frametitle}
	  \begin{tikzpicture}

	    \node[anchor=west, text depth=-0.2em, font={\usebeamercolor[bg]{frametitle}}] at (0, 0) [] (frametitle) {\insertframetitle};

      % Draw the unfilled full progress bar, and superimpose it with the
      % progress bar reflecting the current progress.
      \draw[-*, color=darkash] (frametitle.south west) -- ++(\bigprogtotal, 0);
			\ifnum\bigproglen=\bigprogtotal\relax
				\draw[-*, color=progfg] (frametitle.south west) -- ++(\bigproglen, 0);
			\else
				\draw[color=progfg] (frametitle.south west) -- ++(\bigproglen, 0);
			\fi

      % Superimpose the frame title on the progress bar.
			\node[anchor=west, text depth=-0.2em] at (0, 0) [] {\insertframetitle};
      %\node[overlay, inner sep=0, anchor=east] at ($(current bounding box.east)+(0,-0.5em)$){\includegraphics[scale=0.06]{/Users/duncan/Downloads/Halloween-PNG-Images.png}};
	  \end{tikzpicture}
	\end{beamercolorbox}
}

\AtBeginSection{\frame{\sectionpage}}
\setbeamertemplate{section page}{%

  % Update the length of narrowest (sml) progress bar to be drawn. One should be
  % reminded that this macro needs to be invoked in each template, as length
  % variables in LaTeX are locally-scoped.
	\updatesmlprog

  % Apply the beamer color, and use it to create a new FG color for it. This
  % is used to draw the progress bar in the same same color as the section title
  % text.
  % The color was not hardcoded in order to make it possible to change this
  % indirectly by setting the section title color.
  \usebeamercolor{section page}
	\colorlet{progfg}{fg}

  % Add this to remove the white top border that appears.
	\nointerlineskip

	\begin{beamercolorbox}[wd=\paperwidth, ht=\paperheight, sep=\bigsep]{section page}
		\begin{tikzpicture}

      % Set the smaller size of slide as the canvas over which we will draw.
      \useasboundingbox (0, 0) rectangle (\smlpagewidth, \smlpageheight);

      \node [anchor=west, text depth=-0.06em] at (current bounding box.west) [font={\usebeamerfont{section title}\usebeamercolor[bg]{section title}}] (title) {\insertsection};

      % Draw the unfilled full progress bar, and superimpose it with the
      % progress bar reflecting the current progress.
			\draw[-*, color=darkash] (title.south west) -- ++(\smlprogtotal, 0);
			\ifnum\smlproglen=\smlprogtotal\relax
				\draw[-*, color=progfg] (title.south west) -- ++(\smlproglen, 0);
			\else
				\draw[color=progfg] (title.south west) -- ++(\smlproglen, 0);
			\fi

      % Superimpose the section title on the progress bar.
			\node [anchor=west, text depth=-0.06em] at (current bounding box.west) [font={\usebeamerfont{section title}\usebeamercolor[fg]{section title}}] (title) {\insertsection};
		\end{tikzpicture}
	\end{beamercolorbox}
}

\AtBeginSubsection{\frame{\subsectionpage}}
\setbeamertemplate{subsection page} {

  % Add this to remove the white top border that appears.
	\nointerlineskip

	\begin{beamercolorbox}[wd=\paperwidth, ht=\paperheight, sep=0pt]{subsection page}
		\begin{tikzpicture}

      % Set the entire slide as the canvas over which we will draw.
      \useasboundingbox (0, 0) rectangle (\paperwidth, \paperheight);

      \node [draw, text depth=-0.06em, rounded corners=0.6cm, line width=0.05cm, minimum height=1.2cm, minimum width=3cm, inner xsep=0.8cm, inner ysep=0] at (current bounding box.center) [font={\usebeamerfont{subsection title}\usebeamercolor[fg]{subsection title}}] (title) {\insertsubsection};
		\end{tikzpicture}
	\end{beamercolorbox}
}

% We do not need to use \makeatletter here (even though we are using @ in names)
% because the cat code for @ is set automatically to 11 (i.e. the catcode for
% letters) in .sty and .cls files. Note that this would however need to be set
% to 11 manually (using \makeatletter) and back to 12 (using \makeatother) in
%.tex files.
\define@key{beamerframe}{subsection}[true]{%
    % TODO: Providing the color directly is not the best solution, because for
    % the BW theme, then royalblue must be set to black. And I don't like it.
    \setbeamercolor{frametitle}{fg=royalblue}

    % TODO: Add a boolean here so that I set it at this point to on, and
    % reset it once the slide title is drawn in the frametitle template.
    % For now I need the user would need to employ \begingroup and \endgroup
    % to manage the style himself.

    \setbeamertemplate{enumerate item}{
      \tikz[baseline={([yshift=-.65ex]current bounding box.center)}]{
          \node[draw, semithick, inner sep=0.1em, font=\sffamily\scriptsize, align=center, rotate=0, minimum width=1em, minimum height=0.9em, rounded corners=0.45em] {\insertenumlabel};
      }
    }
}

\setbeamertemplate{note page}{%
  \vspace{2em}
  \textbf{\insertframetitle}
  \vspace{0.5em}
  \insertnote
}