beamer: Determine the Last Frame Before Appendix Starts (Even if There Are )

Question

Normally I have something like Frame 4 / 30 in the footline.
The total frame count is done by the command \insertframenumber.
In my beamer presentation, I have an extensive appendix/backup.
Therefore I didn't want the appendix frames to be counted to the total frame count.
I used this and that question to do that -- leading to a new custom command called \myLastContentFrame.
Everything was good.
Now I used overlay specifications like [<+->] and the \myLastContentFrame sadly also considers the overlays into account.

How to determine the last frame before the appendix even if overlay specifications are used? In the appendix frames I want e. g. 34 / 30 (where 30 is the last content frame count).

\documentclass[c]{beamer}

%% Appearance
% -----------------------
\setbeamercolor{block title}{fg=white,bg=red}
\setbeamercolor{block body}{fg=black,bg=gray}
\setbeamercolor{background canvas}{bg=pink}
% -----------------------

%% Functionality
% -----------------------
\usepackage{xparse}

% https://tex.stackexchange.com/questions/347560
\ExplSyntaxOn
\DeclareExpandableDocumentCommand{\myLastContentFrame}{}
 {
  \fp_to_int:n
   {
     (
      \use:c{beamer@startpageofappendix} - 1 > 0
      ?
      \use:c{beamer@startpageofappendix} - 1 
      :
      \inserttotalframenumber
     )
   }
 }
\ExplSyntaxOff
% -----------------------

\begin{document}

\begin{frame}
\frametitle{Content Frame 1}
\begin{itemize}
\huge
\item \texttt{\textbackslash insertframenumber:} \insertframenumber
\item \texttt{\textbackslash inserttotalframenumber:} \inserttotalframenumber
\item \texttt{\textbackslash myLastContentFrame:} \myLastContentFrame
\end{itemize}
\end{frame}

\begin{frame}
\frametitle{Content Frame 1}
\begin{itemize}[<+->]
\huge
\item \texttt{\textbackslash insertframenumber:} \insertframenumber
\item \texttt{\textbackslash inserttotalframenumber:} \inserttotalframenumber
\item \texttt{\textbackslash myLastContentFrame:} \myLastContentFrame
\end{itemize}
\end{frame}

\begin{frame}
\frametitle{Last Content Frame}
\begin{itemize}[<+->]
\huge
\item \texttt{\textbackslash insertframenumber:} \insertframenumber
\item \texttt{\textbackslash inserttotalframenumber:} \inserttotalframenumber
\item \texttt{\textbackslash myLastContentFrame:} \myLastContentFrame
\end{itemize}

\begin{block}{Last Content Frame}
The number of this frame -- the last frame befpore the appendix starts -- should be the value of \texttt{\textbackslash myLastContentFrame}.
\end{block}

\end{frame}

\appendix

\begin{frame}
\frametitle{First Appendix Frame}
\Huge \textcolor{red}{Start of Appendix!}
\begin{itemize}
\huge
\item \texttt{\textbackslash insertframenumber:} \insertframenumber
\item \texttt{\textbackslash inserttotalframenumber:} \inserttotalframenumber
\item \texttt{\textbackslash myLastContentFrame:} \myLastContentFrame
\end{itemize}
\end{frame}

\end{document}

@samcarter This time I tried something new...I'll do better/different next time :). — Dr. Manuel Kuehner, Mar 05 '17 at 20:53

samcarter_is_at_topanswers.xyz · Answer 1 · 2017-03-05T21:15:53.890

5

No need to reinvent the wheel, appendixnumberbeamer already did this for you:

(the only thing I changed is to comment two lines from the original appendix definition, otherwise the appendix would restart counting from 1)

\documentclass[c]{beamer}

\usepackage{appendixnumberbeamer}

\setbeamertemplate{footline}{\insertframenumber~/~\inserttotalframenumber}

\makeatletter
\def\appendix{
  \xdef\mainend{\theframenumber}
  \immediate\write\@auxout{\string\global\string\@namedef{mainendframenumber}{\mainend}}
  \appendixorig
%  \gdef\inserttotalframenumber{\appendixtotalframenumber}%
%  \setcounter{framenumber}{0}
}
\makeatother

\begin{document}

\begin{frame}
test
\pause[3]
\end{frame}

\begin{frame}
test
\end{frame}

\appendix

\begin{frame}
Appendix
\end{frame}

\end{document}

edited Mar 05 '17 at 21:15

answered Mar 05 '17 at 20:29

samcarter_is_at_topanswers.xyz

158,329

Thanks. Can you explain what the general approach is? – Dr. Manuel Kuehner Mar 05 '17 at 20:31
1

@Dr.ManuelKuehner The general approach is to use a package which does what you want :) – samcarter_is_at_topanswers.xyz Mar 05 '17 at 20:33
@Dr.ManuelKuehner For "more" information texdoc appendixnumberbeamer – samcarter_is_at_topanswers.xyz Mar 05 '17 at 20:42
Haha - ok...I meant why do "we" need the stuff between \makeatletterand \makeatother. If it seems to be a silly question -- I really don't know. – Dr. Manuel Kuehner Mar 05 '17 at 20:52
Seriously: I'll test it tomorrow. Good night :). (btw: I still want that the normal frame counter goes beyond the total frame counter -- like frame 34/30 if 30 is the last content frame and 34 is a frame in the appendix). I can't test it right now because I updated MiKTeX and it went wrong... – Dr. Manuel Kuehner Mar 05 '17 at 20:55
1

@Dr.ManuelKuehner As said in my answer, the "stuff" between \makeatletter and \makeatother is necessary to make make your frame counter to go beyond the total framenumber. Normally it would restart with 1 – samcarter_is_at_topanswers.xyz Mar 05 '17 at 21:05
1

@Dr.ManuelKuehner Perfect time to switch to texlive :) – samcarter_is_at_topanswers.xyz Mar 05 '17 at 21:06
Ahhhh - I was blind somehow. – Dr. Manuel Kuehner Mar 05 '17 at 21:08
1

@samcarter: A package that uses \makeatletter...\makeatother? Oh my ... But as I can see, it uses a similar approach to totcount, but it is no package at all, in the sense of \ProvidesPackage – Mar 05 '17 at 21:08
@ChristianHupfer Unnecessary, but it does not hurt, does it? – samcarter_is_at_topanswers.xyz Mar 05 '17 at 21:15
1

@samcarter: According to egreg \makeatletter should never appear in a package... – Mar 05 '17 at 21:15
1

@ChristianHupfer But what will happen to a mere mortal package writer who did this? Will he be bound to a mountain and an eagle is picking out all @ from his liver? Or will he only be excluded from the pantheon of TeX-Gods? – samcarter_is_at_topanswers.xyz Mar 05 '17 at 21:23
2

@samcarter: \let\eagle\egreg ;-) ... No, he will never be allowed to write packages again or upload something to the Holy Shrine of Typography (i.e. CTAN );-) – Mar 05 '17 at 21:24
@egreg You are an eagle now :). And sadly, it took me some seconds until I got the joke. – Dr. Manuel Kuehner Mar 06 '17 at 00:37
I accept the other answer -- I literally flipped a coin. Both solve the problem/question. Thanks again. – Dr. Manuel Kuehner Mar 06 '17 at 17:23
1

@Dr.ManuelKuehner I hope the coin had an egreg - errr - eagle on one side :) – samcarter_is_at_topanswers.xyz Mar 06 '17 at 17:28

score 4 · Accepted Answer · 2017-03-05T19:21:41.913

You might suspend the counter framenumber with the command \SuspendCounters from the xassoccnt package, i.e.

with \SuspendCounters{framenumber}.

If the counting should be reenabled, say \ResumeSuspendedCounters{framenumber} later on.

I also changed to using total counters, i.e. with \DeclareTotalAssociatedCounters (requires xassoccnt v1.2)

\documentclass[c]{beamer}

\usepackage{xassoccnt}

% Pre version 1.1 of xassoccnt version
\NewTotalDocumentCounter{totalframenumbers}
\DeclareAssociatedCounters{framenumber}{totalframenumbers}

% Version 1.2. of xassoccnt allows this in one go...
%\DeclareTotalAssociatedCounters{framenumber}{totalframenumbers}

%% Appearance
% -----------------------
\setbeamercolor{block title}{fg=white,bg=red}
\setbeamercolor{block body}{fg=black,bg=gray}
\setbeamercolor{background canvas}{bg=pink}
% -----------------------

%% Functionality
% -----------------------
\usepackage{xparse}

% http://tex.stackexchange.com/questions/347560

\newcommand{\myReallyLastContentFrame}{%
  \TotalValue{totalframenumbers}
}
\ExplSyntaxOn
\DeclareExpandableDocumentCommand{\myLastContentFrame}{}
 {
  \fp_to_int:n
   {
     (
      \use:c{beamer@startpageofappendix} - 1 > 0
      ?
      \use:c{beamer@startpageofappendix} - 1 
      :
      \inserttotalframenumber
     )
   }
 }
\ExplSyntaxOff
% -----------------------

\begin{document}

\begin{frame}
\frametitle{Content Frame 1}
\begin{itemize}
\huge
\item \texttt{\textbackslash insertframenumber:} \insertframenumber
\item \texttt{\textbackslash inserttotalframenumber:} \inserttotalframenumber
\item \texttt{\textbackslash myLastContentFrame:} \myReallyLastContentFrame 
\end{itemize}
\end{frame}

\begin{frame}
\frametitle{Content Frame 1}
\begin{itemize}[<+->]
\huge
\item \texttt{\textbackslash insertframenumber:} \insertframenumber
\item \texttt{\textbackslash inserttotalframenumber:} \inserttotalframenumber
\item \texttt{\textbackslash myLastContentFrame:} \myReallyLastContentFrame
\end{itemize}
\end{frame}

\begin{frame}
\frametitle{Last Content Frame}
\begin{itemize}[<+->]
\huge
\item \texttt{\textbackslash insertframenumber:} \insertframenumber
\item \texttt{\textbackslash inserttotalframenumber:} \inserttotalframenumber
\item \texttt{\textbackslash myLastContentFrame:} \myReallyLastContentFrame
\end{itemize}

\begin{block}{Last Content Frame}
The number of this frame -- the last frame befpore the appendix starts -- should be the value of \texttt{\textbackslash myLastContentFrame}.
\end{block}

\end{frame}

\appendix

\SuspendCounters{framenumber}
\begin{frame}
\frametitle{First Appendix Frame}
\Huge \textcolor{red}{Start of Appendix!}
\begin{itemize}
\huge
\item \texttt{\textbackslash insertframenumber:} \insertframenumber
\item \texttt{\textbackslash inserttotalframenumber:} \inserttotalframenumber
\item \texttt{\textbackslash myLastContentFrame:} \myReallyLastContentFrame
\end{itemize}
\end{frame}

\end{document}

Thanks for the fresh idea. I'll try it tomorrow. Is the idea that there is a new counter that synchronizes with the beamer counter? — Dr. Manuel Kuehner, Mar 05 '17 at 19:30
@Dr.ManuelKuehner: Yes, that's the basic purpose of the xassoccnt packages. The total document counter feature is used in order to store the counter value at the end of the document to the .aux file and reuse it with the next run. — , Mar 05 '17 at 19:32
I just tested the code. It compiles well. Apparently I was unclear about my objective: I still want that the framenumber counter counts on so that in the appendix I have e. g. frame 34/30. So every frame still has an individual frame number to which I can refer to. — Dr. Manuel Kuehner, Mar 06 '17 at 15:58
@Dr.ManuelKuehner: I can change my solution but actually, I can't follow the strategy behind your numbering scheme — , Mar 06 '17 at 16:38

beamer: Determine the Last Frame Before Appendix Starts (Even if There Are )

2 Answers2