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Metropolis 的突出框架中没有框架编号

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Metropolis 的突出框架中没有框架编号

我想让用户可以选择将来自 Beamer 主题 Metropolis 的突出帧从帧计数中排除。只要我将帧选项写为 ，这种方法就有效noframenumbering, standout。但如果我颠倒顺序并写为 ，standout, noframenumbering则会出现错误

Package keyval Error: noframenumbering undefined. [  \end{frame}]

在我的 MWE 中（如下）。我应该怎么做才能允许这两个订单？

\documentclass{beamer}
% Standout frame code from [Metropolis' inner theme](https://github.com/matze/mtheme/blob/master/source/beamerinnerthememetropolis.dtx)
\usepackage{keyval}
\makeatletter
\define@key{beamerframe}{c}[true]{% centered
  \beamer@frametopskip=0pt plus 1fill\relax%
  \beamer@framebottomskip=0pt plus 1fill\relax%
  \beamer@frametopskipautobreak=0pt plus .4\paperheight\relax%
  \beamer@framebottomskipautobreak=0pt plus .6\paperheight\relax%
  \def\beamer@initfirstlineunskip{}%
}
\providebool{metropolis@standout}
\define@key{beamerframe}{standout}[true]{%
  \booltrue{metropolis@standout}
  \begingroup
    \setkeys{beamerframe}{c}
    \setbeamertemplate{frame numbering}{}
    % \setkeys{beamerframe}{noframenumbering}
    \ifbeamercolorempty[bg]{palette primary}{
      \setbeamercolor{background canvas}{
        use=palette primary,
        bg=-palette primary.fg
      }
    }{
      \setbeamercolor{background canvas}{
        use=palette primary,
        bg=palette primary.bg
      }
    }
  \centering
  \usebeamercolor[fg]{palette primary}
  \usebeamerfont{standout}
}
\pretocmd{\beamer@reseteecodes}{%
  \ifbool{metropolis@standout}{
    \endgroup
    \boolfalse{metropolis@standout}
  }{}
}{}{}
\makeatother
\begin{document}
  \begin{frame}[standout]
    standout
  \end{frame}

  \begin{frame}[noframenumbering, standout]
    noframenumbering, standout
  \end{frame}

  % This frame produces the error message
  \begin{frame}[standout, noframenumbering]
    standout, noframenumbering
  \end{frame}
\end{document}

答案1

这个答案只有在以下人士的帮助下才有可能@samcarter！

问题是内部\setbeamercolor使用\setkeys，并且keyval不能\setkeys嵌套，如果嵌套它们，内部调用的键前缀将用于外部调用的其余部分，因此noframenumbering不会被解析为 的一部分beamerframe，而是beamerthc（由 内部使用\setbeamercolor）。

为了解决这个问题，有两种根本不同的方法：

  1. 不要使用\setbeamercolor直接调用的内部函数。（@samcarter 采取的方法，如果beamer改变其内部函数，理论上可能会失效）
  2. 修复\setkeys后可嵌套。（的一般修复keyval不应该有不良副作用，但理论上如果某些代码依赖于的这个限制则可能会有\setkeys）

使用内部\setbeamercolor

\documentclass{beamer}

% Standout frame code from [Metropolis' inner theme](https://github.com/matze/mtheme/blob/master/source/beamerinnerthememetropolis.dtx)
%\usepackage{keyval}
\makeatletter
\define@key{beamerframe}{c}[true]{% centered
  \beamer@frametopskip=0pt plus 1fill\relax%
  \beamer@framebottomskip=0pt plus 1fill\relax%
  \beamer@frametopskipautobreak=0pt plus .4\paperheight\relax%
  \beamer@framebottomskipautobreak=0pt plus .6\paperheight\relax%
  \def\beamer@initfirstlineunskip{}%
}
\providebool{metropolis@standout}
\define@key{beamerframe}{standout}[true]{%
  \booltrue{metropolis@standout}%
  \begingroup
    \setkeys{beamerframe}{c}%
    \setbeamertemplate{frame numbering}{}%
    % \setkeys{beamerframe}{noframenumbering}%
    \def\beamer@temp{background canvas}%
    \expandafter\def\csname beamer@thcuse@\beamer@temp\endcsname{%
        \@for\@temp:={palette primary}\do{\expandafter\beamer@thc@usecolor\expandafter{\@temp}}}%
    \ifbeamercolorempty[bg]{palette primary}{%
       \expandafter\def\csname beamer@thcbg@\beamer@temp\endcsname{\def\beamer@thc@bg{-palette primary.fg}}%
    }{%
       \expandafter\def\csname beamer@thcbg@\beamer@temp\endcsname{\def\beamer@thc@bg{palette primary.bg}}%
    }%
  \centering
  \usebeamercolor[fg]{palette primary}%
  \usebeamerfont{standout}%
}
\pretocmd{\beamer@reseteecodes}{%
  \ifbool{metropolis@standout}{%
    \endgroup
    \boolfalse{metropolis@standout}%
  }{}%
}{}{}
\makeatother

\begin{document}
  \begin{frame}[standout]
    standout
  \end{frame}

  \begin{frame}[noframenumbering, standout]
    noframenumbering, standout
  \end{frame}

  % This frame produces the error message
  \begin{frame}[standout, noframenumbering]
    standout, noframenumbering
  \end{frame}
  
  \begin{frame}
  content...
  \insertframenumber
  \end{frame}
\end{document}

修补\setkeys

\documentclass{beamer}
% Standout frame code from [Metropolis' inner theme](https://github.com/matze/mtheme/blob/master/source/beamerinnerthememetropolis.dtx)
%\usepackage{keyval} % loaded by beamer

\makeatletter
% patch \setkeys to be nestable:
\NewCommandCopy\my@setkeys@orig\setkeys
\def\setkeys{\expandafter\my@setkeys@aux\expandafter{\KV@prefix}}
\long\def\my@setkeys@aux#1#2#3{\my@setkeys@orig{#2}{#3}\def\KV@prefix{#1}}

\define@key{beamerframe}{c}[true]{% centered
  \beamer@frametopskip=0pt plus 1fill\relax
  \beamer@framebottomskip=0pt plus 1fill\relax
  \beamer@frametopskipautobreak=0pt plus .4\paperheight\relax
  \beamer@framebottomskipautobreak=0pt plus .6\paperheight\relax
  \def\beamer@initfirstlineunskip{}%
}
\providebool{metropolis@standout}
\let\KV@beamerframe@cx\KV@beamerframe@c
\let\KV@beamerframe@cx@default\KV@beamerframe@c@default
\define@key{beamerframe}{standout}[true]{%
  \booltrue{metropolis@standout}%
  \begingroup
    \setkeys{beamerframe}{cx}%
    \setbeamertemplate{frame numbering}{}%
    % \setkeys{beamerframe}{noframenumbering}%
    \ifbeamercolorempty[bg]{palette primary}{%
      \setbeamercolor{unrelated beamer color}{%
        use=palette primary,
        bg=-palette primary.fg
      }%
    }{%
      \setbeamercolor{unrelated beamer color}{%
        use=palette primary,
        bg=palette primary.bg
      }%
    }%
  \centering
  \usebeamercolor[fg]{palette primary}%
  \usebeamerfont{standout}%
}
\pretocmd{\beamer@reseteecodes}{%
  \ifbool{metropolis@standout}{%
    \endgroup
    \boolfalse{metropolis@standout}%
  }{}%
}{}{}
\makeatother

\begin{document}
  \begin{frame}[standout]
    standout
  \end{frame}

  \makeatletter
  \begin{frame}[noframenumbering, standout]
    noframenumbering, standout
  \end{frame}

  % This frame produces the error message
  \begin{frame}[standout, noframenumbering]
      %\show\KV@beamerframe@noframenumbering
    standout, noframenumbering
  \end{frame}

  \begin{frame}
    normal
    \insertframenumber
  \end{frame}
\end{document}

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