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如何防止 Beamer 中的脚注插入空白幻灯片？

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如何防止 Beamer 中的脚注插入空白幻灯片？

当在 beamer 中创建的脚注包含深度太大的框时，beamer 会在带有脚注的幻灯片前插入一个空白幻灯片。

平均能量损失

\documentclass{beamer}
\setbox0=\hbox{}
\dp0=1.131ex
\begin{document}
\begin{frame}
\footnote{\box0 }
\end{frame}
\end{document}

如果我将其更改1.131ex为1.130ex，则只有一张幻灯片。

我的实际问题与具有人工深度的空盒子无关（当然）。我可以通过将深度过大的材料放入盒子并将其设置\dp为 来解决此问题0pt，但这似乎总体上是错误的解决方案。

在这种情况下，防止插入额外幻灯片的正确方法是什么？

答案1

这在 beamer v3.55 中曾短暂地起作用，可以从中查看https://github.com/josephwright/beamer/releases/tag/v3.55

beamer v3.54 或更早版本的解决方法：

\documentclass{beamer}
\setbox0=\hbox{}
\dp0=1.131ex

\makeatletter
\long\def\beamer@doseveralframes#1{%
  \ifx\beamer@againname\@empty\else%
    % Again stuff
    \expandafter \gdef\csname beamer@again@\beamer@againname\endcsname{{#1}}%
  \fi%
  \beamer@slideinframe=1\relax%
  \loop%
  \beamer@anotherslidefalse%
  \gdef\beamer@doifnotinframe{}%
  \def\beamer@doifinframe{\begin{beamer@frameslide}%
    #1%
  \end{beamer@frameslide}}%
  \beamer@masterdecode{\beamer@whichframes}%
  \beamer@donow%
  \ifbeamer@twoscreenstext%
    \beamer@dosecondscreennow{#1}% two screen stuff
  \fi%
  \ifbeamer@anotherslide
  \advance\beamer@slideinframe by 1\relax
  \repeat%
  \beamer@writeslidentry%
  \beamer@reseteecodes}
\makeatother

\begin{document}
\begin{frame}
\footnote{\box0 }
\end{frame}
\end{document}

beamer v3.56 或更新版本的解决方法：

\documentclass{beamer}
\setbox0=\hbox{}
\dp0=1.131ex

\makeatletter
% The main decoding macro tolerates a range of active characters, which
% require a little set up. In particular, as an active space is allowed
% all of the lines here have to be terminated with "%". The two-step
% setup for \beamer@@@temp makes sure everything is expanded and removes
% all of the spaces at this stage.
\newbox\beamer@decode@box
\begingroup
  \catcode`\|=\active
  \catcode`\:=\active
  \catcode`\,=\active
  \catcode`\.=\active
  \catcode`\+=\active
  \catcode`\-=\active
  \catcode`\(=\active
  \catcode`\)=\active
  \catcode`\ =\active
\xdef\beamer@masterdecode#1{%
\noexpand\beamer@localanotherslidefalse%
\setbox0=\hbox{%
\unexpanded{%
\ifnum\catcode`\|=\active\edef|{\string|}\fi%
\ifnum\catcode`\:=\active\edef:{\string:}\fi%
\ifnum\catcode`\,=\active\edef,{\string,}\fi%
\ifnum\catcode`\.=\active\edef.{\string.}\fi%
\ifnum\catcode`\+=\active\edef+{\string+}\fi%
\ifnum\catcode`\-=\active\edef-{\string-}\fi%
\ifnum\catcode`\(=\active\edef({\string(}\fi%
\ifnum\catcode`\)=\active\edef){\string)}\fi%
\ifnum\catcode`\ =\active\edef {\string }\fi}%
\edef\noexpand\beamer@@@temp{#1\string|stop\string:0\string|}%
\edef\noexpand\beamer@@@temp{\unexpanded{\expandafter\zap@space\beamer@@@temp}%
\space\noexpand\@empty}%
\unexpanded{\expandafter\beamer@decode\beamer@@@temp%
\ifbeamer@localanotherslide\aftergroup\beamer@localanotherslidetrue\fi}%
}%
}%
\endgroup
\makeatother

\begin{document}
\begin{frame}
\footnote{\box0 }
\end{frame}
\end{document}

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