Beamer 中的两级树形导航

Question

我很好奇，对于 Beamer 树外部主题包来说，什么是有效的解决方法，可以实现两级导航而不是默认的三级导航。

例如，我比较偏爱这种格式：http://www.math.umbc.edu/~rouben/beamer/beamer_pstricks.pdf

在此演示文稿中，子小节是子节的水平树。我该如何做？任何意见都将不胜感激。

Answer 1

您可以headline按照 中的定义重新定义模板beamerouterthemetree.sty，以获得所需的布局；如下所示：

\documentclass{beamer}
\useoutertheme{tree}

\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}\insertshorttitle
    \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}%
      \ifbeamer@tree@showhooks
        \setbox\beamer@tempbox=\hbox{\insertsectionhead}%
        \ifdim\wd\beamer@tempbox>1pt%
          \hskip2pt\raise1.9pt\hbox{\vrule width0.4pt height1.875ex\vrule width 5pt height0.4pt}%
          \hskip1pt%
        \fi%
      \else%  
        \hskip6pt%
      \fi%
      \insertsectionhead
      \usebeamerfont{subsection in head/foot}%
      \ifbeamer@tree@showhooks
        \setbox\beamer@tempbox=\hbox{\insertsubsectionhead}%
        \ifdim\wd\beamer@tempbox>1pt%
          \ \raise1.9pt\hbox{\vrule width 5pt height0.4pt}%
          \hskip1pt%
        \fi%
      \else%  
        \hskip12pt%
      \fi%
      \insertsubsectionhead\hfill\insertframenumber/\inserttotalframenumber\hspace{0.5em}
    \end{beamercolorbox}
    \begin{beamercolorbox}[wd=\paperwidth,colsep=1.5pt]{lower separation line head}
    \end{beamercolorbox}
}
\makeatother
\title{Tree Outer Theme}
\begin{document}

\section{Test Section}
\begin{frame} test \end{frame}
\subsection{Test Subsection One}
\begin{frame} test \end{frame}
\subsection{Test Subsection Two}
\begin{frame} test \end{frame}

\end{document}

生成的标题的一些图像显示了所需的布局：

和