I use footnotes for citations in combination with the beamer
package. I adapted the code from this question and everything works quice nicely – except when using overlays. Then the footnotes only show on one slide but are hidden afterwards as shown below.
So my question is: How can I accomplish that the footnotes appear on the same slide as the corresponding item? If that is not possible, the footnotes should at least be visible until the next frame appears.
Here is my MWE:
\documentclass{beamer}
\usepackage[english]{babel}
\usepackage{csquotes}
\usepackage[style=numeric-comp, backend=biber, citetracker=true,sorting=none]{biblatex}
\usepackage{hyperref}
\addbibresource{biblatex-examples.bib}
\makeatletter
\newtoggle{cbx@togcite}
% Citation number in brackets
\renewcommand\@makefntext[1]{%
\iftoggle{cbx@togcite}
{{\normalfont[\@thefnmark]}\enspace #1}
{{\normalfont\@thefnmark}\enspace #1}%
\global\togglefalse{cbx@togcite}}
\DeclareCiteCommand{\sfcite}[\cbx@superscript]%
{\usebibmacro{cite:init}%
\let\multicitedelim=\supercitedelim
\iffieldundef{prenote}
{}
{\BibliographyWarning{Ignoring prenote argument}}%
\iffieldundef{postnote}
{}
{\BibliographyWarning{Ignoring postnote argument}}}
{\usebibmacro{citeindex}%
\usebibmacro{sfcite}%
\usebibmacro{cite:comp}}
{}
{\usebibmacro{cite:dump}}
\newbibmacro*{sfcite}{%
\ifciteseen
{}
{\xappto\cbx@citehook{%
\global\toggletrue{cbx@togcite}%
\noexpand\footnotetext[\thefield{labelnumber}]{%
\fullcite{\thefield{entrykey}}\addperiod}}}}
\newrobustcmd{\cbx@superscript}[1]{%
\mkbibsuperscript{\mkbibbrackets{#1}}%
\cbx@citehook%
\global\let\cbx@citehook=\empty}
\let\cbx@citehook=\empty
\makeatother
\begin{document}
\begin{frame}
\frametitle{First Frame}
\begin{itemize}[<+->]
\item First citation. \sfcite{reese}
\item Second citation.\sfcite{springer}
\end{itemize}
\end{frame}
\begin{frame}
\frametitle{Second Frame}
Third citation.\sfcite{glashow}
\end{frame}
\end{document}
Best Answer
The first slide has both footnotes instead of just the first one. This is less than ideal, but expected - you'll get the same result with
\footfullcite
.On the second slide the citation commands are issued once more. The footnotes "disappear" because
\ifciteseen
returnstrue
. Again this isn't what you want, but the result isn't surprising. The citation command can be modified to set a footnote for a given entry whenever\ifciteseen
isfalse
or its last footnote appeared on a previous overlay. The latter case is detected by equal frame numbers but different pages.Here are the footnotes on the last slide from the first frame:
And the last slide of the second frame: