# How to allowbreak on Beamer Berkeley left-hand-side navbar?

I have too many sections in my presentation such that the left-hand-side navigation bar is full and only shows the first sections in Fig. 2, initial situation in Fig. 1. Pseudocode

• clean the left-hand-hand side navigation bar when exceed the threshold and start a new one there when on sufficient page
• this feature occurs with Beamer Berkeley appendix so it is possible also with the main document

Code which problem shown in Fig. 2

\documentclass{beamer}
\usetheme{Berkeley}
\logo{\includegraphics{logo.png}}
\usepackage{hyperref}
% https://tex.stackexchange.com/a/346486/13173
\newenvironment{slide}[1]
{\begin{frame}[environment=slide,allowframebreaks]
\frametitle{\insertsection-#1}
}
{\end{frame}}
% fragile only if code
% allowframebreaks not by default

\begin{document}
\title{Sensory system. Primary sensory modalities. Cortical modalities. Kinds of sensory disturbances. Spinal cord disorders. Spinal cord transverse and partial lesion. Cauda equina damage.}
\author{Leo}

\section{Cortical modalities}
\begin{slide}{basics}
More refined aspects of sensation ...
\end{slide}

\section{Cortical modalities}
\begin{slide}{basics}
More refined aspects of sensation ...
\end{slide}

\section{Cortical modalities 2}
\begin{slide}{basics}
More refined aspects of sensation ...
\end{slide}

\section{Cortical modalities 3}
\begin{slide}{basics}
More refined aspects of sensation ...
\end{slide}

\section{Cortical modalities 4}
\begin{slide}{basics}
More refined aspects of sensation ...
\end{slide}

\end{document}


Fig. 1 Situation at the first page, Fig. 2 Situation at Section 6 wheere the navbar has not changed, Fig. 3 Samcarter's answer output + one slide addition but without \part{} - fails on sufficient page count

Output: the left-hand-side navigation bar is not refreshed when the amount of sections exceed its capacity on suffcient enough page

## Testing Samcarter's proposal

I include one slide before Samcarter's body so I get the wrong output in Fig. 3. Solution: Eventually correct output by just adding \part{} in the place where the new navbar is wanted.

TeXLive: 2016
OS: Debian 8.7

• Your code cannot be compiled. Please make a compilable document that does not rely on files we don't have access to. – user36296 Jun 1 '17 at 16:08
• Why do you list the headlines of all the sections in the title? Just leave the title away if you don't use a title slide. – Tiuri Jun 1 '17 at 16:11
• Well, but by having all the sections in your document, you already get a full list of sections in the sidebar. Plus, it is displayed properly. – Tiuri Jun 1 '17 at 16:18

You could manually split the sidebar into smaller chunks that fit in the available space using \part{}.

\documentclass{beamer}

\usetheme{Berkeley}
\logo{\includegraphics[width=1cm]{example-image}}
%\usepackage{hyperref}

\usepackage{xpatch}
\makeatletter
\patchcmd\beamer@@tmpl@frametitle{\insertframetitle}{\insertsection-\insertframetitle}{}{}
\makeatother

\begin{document}
\title{Sensory system. Primary sensory modalities. Cortical modalities. Kinds of sensory disturbances. Spinal cord disorders. Spinal cord transverse and partial lesion. Cauda equina damage.}
\author{Leo}

\section{Cortical modalities}
\begin{frame}{basics}
More refined aspects of sensation ...
\end{frame}

\section{Cortical modalities 1}
\begin{frame}{basics}
More refined aspects of sensation ...
\end{frame}

\section{Cortical modalities 2}
\begin{frame}{basics}
More refined aspects of sensation ...
\end{frame}

\part{}
\section{Cortical modalities 3}
\begin{frame}{basics}
More refined aspects of sensation ...
\end{frame}

\section{Cortical modalities 4}
\begin{frame}{basics}
More refined aspects of sensation ...
\end{frame}

\end{document}


(don't load hyperref, beamer already does this for you)

• @LéoLéopoldHertz준영 The solution is independent of your misuse of the slide environment - I just don't want to condone allowframebreaks as default. – user36296 Jun 1 '17 at 16:54
• @LéoLéopoldHertz준영 It is the exact same output with slide. – user36296 Jun 1 '17 at 16:57
• @LéoLéopoldHertz준영 Yes, place \part{} where you want the break points – user36296 Jun 1 '17 at 16:57
• I confirm your proposal works only with the addition \part{}! - - I think the automatic approach for this is difficult, but manual is a good one. - - Why do you use xpatch package? – Léo Léopold Hertz 준영 Jun 1 '17 at 17:01
• @LéoLéopoldHertz준영 With xpatch I add the section name to the framtitle - which is the way you displayed it in your original code. – user36296 Jun 1 '17 at 17:03