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Erro de “sequência de controle indefinida” para um símbolo em `\setbox` ao redefinir o título do projetor

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Erro de “sequência de controle indefinida” para um símbolo em `\setbox` ao redefinir o título do projetor

Na minha apresentação do beamer, eu queria ter infolinesa linha de rodapé e treeo cabeçalho do outertheme, mas exibindo o subtítulo em vez do título na primeira linha. Então peguei infolinescomo outertheme e \setbeamertemplate[headline]ed copying beamerouterthemetree.sty. Funciona e compila, mas não gosto disso me dá o seguinte erro:

ERROR: Undefined control sequence.

--- TeX said ---
\beamer@@tmpl@headline .../foot} \setbox \tempbox 
                                                  =\hbox {\insertsectionhead...
l.108 \begin{document}

--- HELP ---
TeX encountered an unknown command name. You probably misspelled the
name. If this message occurs when a LaTeX command is being processed,
the command is probably in the wrong place---for example, the error
can be produced by an \item command that's not inside a list-making
environment. The error can also be caused by a missing \documentclass
command.

Aqui está o meu código (despojado/epurado):

\documentclass{beamer}

\usepackage{ragged2e}
\usepackage{etoolbox}
\usepackage{pgf,tikz}
\usetikzlibrary{arrows,shapes}
\apptocmd{\enumerate}{\justifying}{}{}
\apptocmd{\itemize}{\justifying}{}{}
\addtobeamertemplate{block begin}{}{\justifying}

\usetheme{default}
\usecolortheme{beaver}
\useoutertheme{infolines}
\useinnertheme{default}
\setbeamertemplate{sections/subsections in toc}[square]
\setbeamercolor{titlelike}{bg=darkred,fg=gray!15!white}
\setbeamercolor{frametitle}{fg=darkred}
\setbeamercolor{item}{fg=darkred}
\setbeamercolor{author in head/foot}{bg=darkred,fg=gray!5!white}

\setbeamertemplate{headline}
{%
    \begin{beamercolorbox}[wd=\paperwidth,colsep=1.5pt]{upper separation line head}
    \end{beamercolorbox}
    \begin{beamercolorbox}[wd=\paperwidth,ht=2.5ex,dp=1.125ex,%
      leftskip=.3cm,rightskip=.3cm plus1fil]{title in head/foot}
      \usebeamerfont{title in head/foot}\insertshortsubtitle
    \end{beamercolorbox}
    \begin{beamercolorbox}[wd=\paperwidth,ht=2.5ex,dp=1.125ex,%
      leftskip=.3cm,rightskip=.3cm plus1fil]{section in head/foot}
      \usebeamerfont{section in head/foot}
      \setbox\tempbox=\hbox{\insertsectionhead}%
      \ifdim\wd\tempbox>1pt%
        \hskip2pt\raise1.9pt\hbox{\vrule width0.4pt height1.875ex\vrule width 5pt height0.4pt}%
        \hskip1pt%
      \fi%
      \insertsectionhead
    \end{beamercolorbox}
    \begin{beamercolorbox}[wd=\paperwidth,ht=2.5ex,dp=1.125ex,%
      leftskip=.3cm,rightskip=.3cm plus1fil]{subsection in head/foot}
      \usebeamerfont{subsection in head/foot}
      \setbox\tempbox=\hbox{\insertsubsectionhead}%
      \ifdim\wd\tempbox>1pt%
        \hskip9.4pt\raise1.9pt\hbox{\vrule width0.4pt height1.875ex\vrule width 5pt height0.4pt}%
        \hskip1pt%
      \fi%
      \insertsubsectionhead
    \end{beamercolorbox}
    \begin{beamercolorbox}[wd=\paperwidth,colsep=1.5pt]{lower separation line head}
    \end{beamercolorbox}
}

\title{My (short) title}
\subtitle{Yet longer and not shortable subtitle}
\institute[SIN]{Long Long Long Long Long Long Institute Name}
\author[S. Name \and S. Name]{Name \textsc{Long} \and Name \textsc{Long}}
\justifying
\begin{document}

\frame[plain]{\titlepage}

\begin{frame}
  \frametitle{Plan}
  \tableofcontents[pausesections,subsectionstyle=shaded]
\end{frame}

\end{document}

Responder1

Você precisa alocar uma caixa, então faça

\newsavebox{\tempbox}

Se você quiser usar o registro de caixa temporário do Beamer, faça

\makeatletter
\setbeamertemplate{headline}
{%
    \begin{beamercolorbox}[wd=\paperwidth,colsep=1.5pt]{upper separation line head}
    \end{beamercolorbox}
    \begin{beamercolorbox}[wd=\paperwidth,ht=2.5ex,dp=1.125ex,%
      leftskip=.3cm,rightskip=.3cm plus1fil]{title in head/foot}
      \usebeamerfont{title in head/foot}\insertshortsubtitle
    \end{beamercolorbox}
    \begin{beamercolorbox}[wd=\paperwidth,ht=2.5ex,dp=1.125ex,%
      leftskip=.3cm,rightskip=.3cm plus1fil]{section in head/foot}
      \usebeamerfont{section in head/foot}
      \sbox\beamer@tempbox{\insertsectionhead}%
      \ifdim\wd\beamer@tempbox>1pt
        \hskip2pt\raise1.9pt\hbox{\vrule width0.4pt height1.875ex\vrule width 5pt height0.4pt}%
        \hskip1pt
      \fi
      \insertsectionhead
    \end{beamercolorbox}
    \begin{beamercolorbox}[wd=\paperwidth,ht=2.5ex,dp=1.125ex,%
      leftskip=.3cm,rightskip=.3cm plus1fil]{subsection in head/foot}
      \usebeamerfont{subsection in head/foot}
      \sbox\beamer@tempbox{\insertsubsectionhead}%
      \ifdim\wd\beamer@tempbox>1pt
        \hskip9.4pt\raise1.9pt\hbox{\vrule width0.4pt height1.875ex\vrule width 5pt height0.4pt}%
        \hskip1pt
      \fi
      \insertsubsectionhead
    \end{beamercolorbox}
    \begin{beamercolorbox}[wd=\paperwidth,colsep=1.5pt]{lower separation line head}
    \end{beamercolorbox}
}
\makeatother

Observe que eu corrigi o código usando

\sbox\beamer@tempbox{\insertsectionhead}%

que é o comando correto, porque tem “reconhecimento de cores” e \setbox\beamer@tempbox=\hbox{\insertsectionhead}não tem.

Portanto, seja qual for o método que você escolher, use \sbox.

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