General ⇒ Beamer: Add the frame number to the footer

[YuGiOhJCJ]

Hello,

With beamer, I would like to add the frame number to the footer.
I am using texlive 20200327.

Here is my code:

Code: Select all

\documentclass{beamer}
\usetheme{Warsaw}
\title{Beamer Example}

% https://texblog.net/latex-archive/uncategorized/beamer-footline-frame-number/
\newcommand*\oldmacro{}%
\let\oldmacro\insertshorttitle%
\renewcommand*\insertshorttitle{%
  \oldmacro\hfill%
  \insertframenumber\,/\,\inserttotalframenumber}

\begin{document}
	\begin{frame}
		\titlepage
	\end{frame}
	\section{First section}
	\begin{frame}
		abc
	\end{frame}
\end{document}

There is a problem in the output:

beamer.png (37.66 KiB) Viewed 18283 times

The frame number "1 / 2" at the bottom is not aligned to the right of the page.

How to fix that please?

Thank you.
Best regards.

[Bartman]

Please link your crossposts.

[Stefan Kottwitz]

Hi,

welcome to the forum!

The footline template of the split theme contains this code:

Code: Select all

\insertshorttitle\nobreak\hfill

Because of the \hfill, there's empty space at the right. To remove that space and so getting the frame numbers right aligned, you could use the \@gobbletwo command that ignores the next two commands \nobreak\hfill:

Code: Select all

\makeatletter
\renewcommand*\insertshorttitle{%
  \oldmacro\hfill%
  \insertframenumber\,/\,\inserttotalframenumber\@gobbletwo}
\makeatother

As compilable document:

Code: Select all

\documentclass{beamer}
\usetheme{Warsaw}
\title{Beamer Example}

% https://texblog.net/latex-archive/uncategorized/beamer-footline-frame-number/
\newcommand*\oldmacro{}%
\let\oldmacro\insertshorttitle%
\makeatletter
\renewcommand*\insertshorttitle{%
  \oldmacro\hfill%
  \insertframenumber\,/\,\inserttotalframenumber\@gobbletwo}
\makeatother
\begin{document}
	\begin{frame}
		\titlepage
	\end{frame}
	\section{First section}
	\begin{frame}
		abc
	\end{frame}
\end{document}

It's a quick hack though. One could or should redefine the footline template with some more effort, but it works for now.

Stefan

[samcarter]

Let beamer do it for you:

Code: Select all

\documentclass{beamer}
\usetheme{Warsaw}
\title{Beamer Example}
\setbeamertemplate{page number in head/foot}[totalframenumber]
\begin{document}
\begin{frame}
abc
\end{frame}
\end{document}

document.png (18.89 KiB) Viewed 18273 times

[Stefan Kottwitz]

The definition by samcarter is the best. Why it works - that's the footline template code:

Code: Select all

\defbeamertemplate*{footline}{split theme}
{%
  \leavevmode%
  \hbox{\begin{beamercolorbox}[wd=.5\paperwidth,ht=2.5ex,dp=1.125ex,leftskip=.3cm plus1fill,rightskip=.3cm]{author in head/foot}%
    \usebeamerfont{author in head/foot}\insertshortauthor
  \end{beamercolorbox}%
  \begin{beamercolorbox}[wd=.5\paperwidth,ht=2.5ex,dp=1.125ex,leftskip=.3cm,rightskip=.3cm plus1fil]{title in head/foot}%
    \usebeamerfont{title in head/foot}\insertshorttitle\nobreak\hfill\usebeamercolor[fg]{page number in head/foot}\usebeamerfont{page number in head/foot}\usebeamertemplate{page number in head/foot}
  \end{beamercolorbox}}%
  \vskip0pt%
}

You can see that command at the end:

Code: Select all

\usebeamertemplate{page number in head/foot}

And that's what samcarter defined above.

Stefan

[YuGiOhJCJ]

Bartman, sorry I forgot to link my crossposts.
Stefan Kottwitzn, thanks your solution with \@gobbletwo is working.
Samcarter, thanks your solution with \setbeamertemplate is working too.

I found the footline template definition in this file: /usr/share/texmf-dist/tex/latex/beamer/beamerouterthemesplit.sty.
In this file we can see \insertshorttitle\nobreak\hfill.

I was not aware that I was using the split theme.
Is it part of the Warsaw theme?

[Stefan Kottwitz]

Beamer main themes are a combination of

• inner themes: for elements, such as lists and blocks,
• outer themes: for frame layout, such as footline and headline,
• color themes: for color combinations,
• font themes: with font settings.

Warsaw is basically

Code: Select all

\useinnertheme[shadow=true]{rounded}
\useoutertheme{shadow}
\usecolortheme{orchid}
\usecolortheme{whale}
\setbeamerfont{block title}{size={}}

And the shadow theme uses the split theme, where that definition is.

Similar with the other main presentation themes. To see what's actually used, we can take a look into the file or into the .log file to see which files are loaded.

Here you can click the "Run LaTeX here" button to get the log file:

Code: Select all

%!TeX log
\documentclass{beamer}
\usetheme{Warsaw}
\begin{document}
\begin{frame}
abc
\end{frame}
\end{document}

Here is the place starting line 666 in the log file where we can see the loaded theme files:

Code: Select all

...
(/usr/local/texlive/2021/texmf-dist/tex/latex/beamer/beamerbasethemes.sty))
(/usr/local/texlive/2021/texmf-dist/tex/latex/beamer/beamerthemedefault.sty
(/usr/local/texlive/2021/texmf-dist/tex/latex/beamer/beamerfontthemedefault.sty)
(/usr/local/texlive/2021/texmf-dist/tex/latex/beamer/beamercolorthemedefault.sty)
(/usr/local/texlive/2021/texmf-dist/tex/latex/beamer/beamerinnerthemedefault.sty
\beamer@dima=\dimen282
\beamer@dimb=\dimen283
)
(/usr/local/texlive/2021/texmf-dist/tex/latex/beamer/beamerouterthemedefault.sty)))
(/usr/local/texlive/2021/texmf-dist/tex/latex/beamer/beamerthemeWarsaw.sty
(/usr/local/texlive/2021/texmf-dist/tex/latex/beamer/beamerinnerthemerounded.sty)
(/usr/local/texlive/2021/texmf-dist/tex/latex/beamer/beamerouterthemeshadow.sty
(/usr/local/texlive/2021/texmf-dist/tex/latex/beamer/beamerouterthemesplit.sty))
(/usr/local/texlive/2021/texmf-dist/tex/latex/beamer/beamercolorthemeorchid.sty)
(/usr/local/texlive/2021/texmf-dist/tex/latex/beamer/beamercolorthemewhale.sty))

Stefan