[Tex/LaTex] Show ToC of only a section in beamer (completely hide other subsections)

beamersectioningtable of contents

I'm using beamer for a presentation. What I want is that whenever a section o subsection starts, it completely hides other subsections that are outside the section in the ToC.

I mean, for example if I have this structure:

Section 1
  Subsection 1.1
  Subsection 1.2
Section 2
Section 3
  Subsection 3.1
  Subsection 3.2
  Subsection 3.3

I want that the ToC, at the beginning of, for example, subsection 3.2 shows only the subsections of the section 3, and highlights only the subsection 3.2. I mean, it should show something like this:

Table of Contents

Section 1
Section 2
Section 3
  Subsection 3.1
  *Subsection 3.2*
  Subsection 3.3

Where subsection 3.2 is highlighted (is darker) and subsection 3.1 and 3.3 are slightly transparents (like watermarks), but subsection 1.1 and 1.2 are completely invisible (not show in some kind of watermark or so).

Is this possible in Beamer?

Best Answer

Sure, it's possible using the appropriate values for sectionstyle and subsectionstyle (possible values are show, shaded, hide) in the optional argument for \tableofcontents:

\documentclass{beamer}

\AtBeginSubsection[]
{
\begin{frame}<beamer>
\frametitle{Outline}
\tableofcontents[
  currentsection,
  sectionstyle=show/show,
  subsectionstyle=show/shaded/hide
]
\end{frame}
}

\begin{document}

\section{Test Section One}
\begin{frame} test\end{frame}
\subsection{Test Subsection One One}
\begin{frame} test\end{frame}
\subsection{Test Subsection One Two}
\begin{frame} test\end{frame}
\subsection{Test Subsection One Three}
\begin{frame} test\end{frame}

\section{Test Section Two}
\begin{frame} test\end{frame}
\subsection{Test Subsection Two One}
\begin{frame} test\end{frame}
\subsection{Test Subsection Two Two}
\begin{frame} test\end{frame}
\subsection{Test Subsection Two Three}
\begin{frame} test\end{frame}

\section{Test Section Three}
\begin{frame} test\end{frame}
\subsection{Test Subsection Three One}
\begin{frame} test\end{frame}
\subsection{Test Subsection Three Two}
\begin{frame} test\end{frame}
\subsection{Test Subsection Three Three}
\begin{frame} test\end{frame}

\end{document}

An image of the outline obtained just before starting the second subsection of the third section:

enter image description here

Subsections visible only when section entry revealed

The following is very close to what you ask - the subsections will appear on the same slide as the corresponding section is revealed rather than on the slide after. See the section below, for how to get the other behaviour. The screen shots are for the second and third views of the contents page:

Sample second page

Sample third page

\documentclass{beamer}

\usetheme{Warsaw}

\makeatletter
\def\beamer@tocaction@only#1{\only<.(1)>{\usebeamertemplate**{#1}}}
\define@key{beamertoc}{subsectionsonly}[]{\beamer@toc@subsectionstyle{show/only}\beamer@toc@subsubsectionstyle{show/shaded/hide}}
\makeatother

\begin{document}
\AtBeginSection[]{\begin{frame}{Outline}
  \tableofcontents[subsectionsonly, pausesections] 
\end{frame}}

\section{One}
\begin{frame}
  \frametitle{ff}

\end{frame}
\section{Two}
\begin{frame}
  \frametitle{ff}

\end{frame}

\subsection{Two a}
\begin{frame}
  \frametitle{ff}

\end{frame}

\subsection{Two b}
\begin{frame}
  \frametitle{ff}

\end{frame}

\section{Three}
\begin{frame}
  \frametitle{ff}

\end{frame}

\subsection{Three a}
\begin{frame}
  \frametitle{ff}

\end{frame}

\subsection{Three b}
\begin{frame}
  \frametitle{ff}

\end{frame}

\end{document}

The code adds an extra key type only to effect the insertion of an appropriate \only overlay command. This is packaged up in a new key subsectionsonly to \tableofcontents.

Subsections visible once only after section entry is revealed

Inserting an extra pause between the display of the section and that of the subsections, is a bit more involved. One needs to rewrite the functions \beamer@tableofcontents and \beamer@subsectionintoc. This is probably best done via patching of the commands, as below. The screeshots are for the first page revealing section 3 and for the next page:

Sample page w/o subsections

Sample page with subsections

\documentclass{beamer}

\usetheme{Warsaw}

\usepackage{etoolbox}

\makeatletter
\def\beamer@tocaction@only#1{\only<.(1)>{\usebeamertemplate**{#1}}}
\define@key{beamertoc}{subsectionsonly}[]{\beamer@toc@subsectionstyle{show/only}\beamer@toc@subsubsectionstyle{show/shaded/hide}}

\newif\ifbeamer@pausebeforesubsections
\define@key{beamertoc}{pausebeforesubsections}[true]{\beamer@pausebeforesubsectionstrue}

\patchcmd{\beamer@tableofcontents}{\beamer@pausesectionsfalse}%
  {\beamer@pausesectionsfalse\beamer@pausebeforesubsectionsfalse}{}{}

\patchcmd{\beamer@subsectionintoc}{\ifbeamer@pausesubsections\pause\fi}%
  {\ifbeamer@pausesubsections\pause\else%
   \ifbeamer@pausebeforesubsections\ifnumequal{#2}{1}{\pause}{}\fi\fi}{}{}
\makeatother

\begin{document}
\begin{frame}{Outline}
  \tableofcontents[subsectionsonly,pausebeforesubsections,pausesections] 
\end{frame}

\section{One}
\begin{frame}
  \frametitle{ff}

\end{frame}
\section{Two}
\begin{frame}
  \frametitle{ff}

\end{frame}

\subsection{Two a}
\begin{frame}
  \frametitle{ff}

\end{frame}

\subsection{Two b}
\begin{frame}
  \frametitle{ff}

\end{frame}

\section{Three}
\begin{frame}
  \frametitle{ff}

\end{frame}

\subsection{Three a}
\begin{frame}
  \frametitle{ff}

\end{frame}

\subsection{Three b}
\begin{frame}
  \frametitle{ff}

\end{frame}

\end{document}

The above code includes that of the first example and adds a new option pausebeforesubsections, which inserts a \pause before the block of subsections. This is only necessary if pausesubsections is not set. By default pausebeforesubsections is set to false.

Subsections only visible for current section

Use the hideothersubsections option. The code below gives the following table of contents at the beginning of section three, even though section two has subsections:

Sample output

\documentclass{beamer}

\usetheme{Warsaw}

\begin{document}
\AtBeginSection[]{\begin{frame}{Outline}
  \tableofcontents[hideothersubsections, pausesections] 
\end{frame}}

\section{One}
\begin{frame}
  \frametitle{ff}

\end{frame}
\section{Two}
\begin{frame}
  \frametitle{ff}

\end{frame}

\subsection{Two a}
\begin{frame}
  \frametitle{ff}

\end{frame}

\subsection{Two b}
\begin{frame}
  \frametitle{ff}

\end{frame}

\section{Three}
\begin{frame}
  \frametitle{ff}

\end{frame}

\subsection{Three a}
\begin{frame}
  \frametitle{ff}

\end{frame}

\subsection{Three b}
\begin{frame}
  \frametitle{ff}

\end{frame}

\end{document}

See section 10.5 of the beamer manual for further options to control what is and is not visible.

Best Answer

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