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导航栏中只有 3 个项目，可能吗？

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导航栏中只有 3 个项目，可能吗？

我看到一个 Beamer 演示文稿，导航栏中只显示 3 个项目（最后一个、当前突出显示的和下一个）。这怎么可能呢？我使用的是华沙主题，我有（到目前为止）7 个部分，所以导航栏是也长的…

答案1

这是一个可能的解决方案；想法是有两个辅助命令\prevsection并将\nextsection前一节和下一节的名称保存到当前节；这些命令将在headline模板中用于显示所需的信息，而不是通常的导航栏。

\prevsection的更新\nextsection是在内部通过对 的重新定义完成的\beamer@section。

\sectioni您所要做的就是在命令、、\sectionii...的强制参数中填写\sectionviii要在导航栏中显示的信息。

\documentclass{beamer}
\usetheme{Warsaw}

\newcounter{prevsection}
\newcounter{nextsection}

\newcommand\prevsection{}
\newcommand\nextsection{}

\makeatletter
\long\def\beamer@section[#1]#2{%
  \beamer@savemode%
    \mode<all>%
  \ifbeamer@inlecture%
   \refstepcounter{section}%
    \beamer@ifempty{#2}%
    {\long\def\secname{#1}\long\def\lastsection{#1}}%
    {\global\advance\beamer@tocsectionnumber by 1\relax%
      \long\def\secname{#2}%
      \long\def\lastsection{#1}%
      \addtocontents{toc}{\protect\beamer@sectionintoc{\the\c@section}{#2}{\the\c@page}{\the\c@part}%
        {\the\beamer@tocsectionnumber}}}%
    {\let\\=\relax\xdef\sectionlink{{Navigation\the\c@page}{\noexpand\secname}}}%
    \beamer@tempcount=\c@page\advance\beamer@tempcount by -1%
    \beamer@ifempty{#1}{}{%
      \addtocontents{nav}{\protect\headcommand{\protect\sectionentry{\the\c@section}{#1}{\the\c@page}{\secname}{\the\c@part}}}%
      \addtocontents{nav}{\protect\headcommand{\protect\beamer@sectionpages{\the\beamer@sectionstartpage}{\the\beamer@tempcount}}}%
      \addtocontents{nav}{\protect\headcommand{\protect\beamer@subsectionpages{\the\beamer@subsectionstartpage}{\the\beamer@tempcount}}}%
    }%
    \beamer@sectionstartpage=\c@page%
    \beamer@subsectionstartpage=\c@page%
    \def\insertsection{\expandafter\hyperlink\sectionlink}%
    \def\insertsubsection{}%
    \def\insertsubsubsection{}%
    \def\insertsectionhead{\hyperlink{Navigation\the\c@page}{#1}}%
    \def\insertsubsectionhead{}%
    \def\insertsubsubsectionhead{}%
    \def\lastsubsection{}%
    \Hy@writebookmark{\the\c@section}{\secname}{Outline\the\c@part.\the\c@section}{2}{toc}%
    \hyper@anchorstart{Outline\the\c@part.\the\c@section}\hyper@anchorend%
    \beamer@ifempty{#2}{\beamer@atbeginsections}{\beamer@atbeginsection}%
  \fi%
  \beamer@resumemode
    \setcounter{prevsection}{\thesection}%
    \setcounter{nextsection}{\thesection}%
    \addtocounter{prevsection}{-1}%
    \gdef\prevsection{\csname section\romannumeral\theprevsection \endcsname}%
     \addtocounter{nextsection}{1}%
    \renewcommand\nextsection{\csname section\romannumeral\thenextsection \endcsname}%
}%

\setbeamertemplate{headline}
{%
  \leavevmode%
  \@tempdimb=2.4375ex%
  \ifnum\beamer@subsectionmax<\beamer@sectionmax%
    \multiply\@tempdimb by\beamer@sectionmax%
  \else%
    \multiply\@tempdimb by\beamer@subsectionmax%
  \fi%
  \ifdim\@tempdimb>0pt%
    \advance\@tempdimb by 1.125ex%
    \begin{beamercolorbox}[wd=.5\paperwidth,ht=\@tempdimb,right,rightskip=1em]{section in head/foot}%
      \vbox to \@tempdimb{%
      \ifnum\thesection=1 \else%
        \vfill{\color{fg!40!bg}\prevsection}%
      \fi%
        \vfill\insertsectionhead%
      \ifnum\thesection=\beamer@sectionmax \else%
        \vfill{\color{fg!40!bg}\nextsection}%
     \fi\vfill%
    }%
    \end{beamercolorbox}%
    \begin{beamercolorbox}[wd=.5\paperwidth,ht=\@tempdimb]{subsection in head/foot}%
      \vbox to\@tempdimb{\vfil\insertsubsectionnavigation{.5\paperwidth}\vfil}%
    \end{beamercolorbox}%
  \fi%
}%
\makeatother

% Here you put the names that will go in the navigation bar
\newcommand\sectioni{test one}
\newcommand\sectionii{test two}
\newcommand\sectioniii{test three}
\newcommand\sectioniv{test four}
\newcommand\sectionv{test five}
\newcommand\sectionvi{test six}
\newcommand\sectionvii{test seven}
\newcommand\sectionviii{test eight}

\begin{document}

\section{test one}
\begin{frame}test\end{frame}

\section{test two}
\begin{frame}test\end{frame}

\section{test three}
\begin{frame}test\end{frame}

\section{test four}
\begin{frame}test\end{frame}

\section{test five}
\begin{frame}test\end{frame}

\end{document}

一些标题图片：

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答案2

我从这段代码中得出了一个更简单的解决方案：Beamer Warsaw 主题：减少导航栏中可见的子部分数量

除了第一页，我把三个部分标题都弄对了。如果你不介意只显示前两个标题，只需注释掉第一页的标题命令代码即可。

\documentclass{beamer}
\usetheme{Warsaw}
\makeatletter
% A new section definition to automatically set labels with the name: sec:sectionnumber
\let\oldsection\section
\renewcommand{\section}[1]{\oldsection{#1}\label{sec:\thesection}}
% A new subsection definition to automatically set labels with the name: sec:sectionnumber.subsectionnumer
\let\oldsubsection\subsection
\renewcommand{\subsection}[1]{\oldsubsection{#1}\label{sec:\thesection.\thesubsection}}
%init some calculators
\newcounter{calculator}
\newcounter{othercalculator}
\newcounter{calcmaxsec}
\newcounter{calcmaxsubsec}

\newcommand{\calcsubsection}[1]%procedure to get the name of section  thissection+i
{
\setcounter{calculator}{\thesubsection}\addtocounter{calculator}{#1}
\@ifundefined{r@sec:\thesection.\thecalculator}{}{\color{fg!40!bg}         
\nameref{sec:\thesection.\thecalculator}}
}
\newcommand{\calcsection}[1]%procedure to get the name of subsection  thissection.thissubsection+i
{
\setcounter{othercalculator}{\thesection\addtocounter{othercalculator}{#1}
\@ifundefined{r@sec:\thesection}{}{\color{fg!40!bg}\nameref{sec:\theothercalculator}}
 }
 \newcommand{\Testframe}%some testframe definition
 {
    \begin{frame}
        The Section: \thesection\\
        The Subsection: \thesubsection\\
        The Calculator: \thecalculator\\
        The section calculator: \theothercalculator\\
        Count\thesection
    \end{frame}
 }
 %Defining the layout%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \setbeamertemplate{headline}
 {%
 \leavevmode%
 \@tempdimb=1.5ex%
 \ifnum\beamer@subsectionmax<\beamer@sectionmax%
 \multiply\@tempdimb by\beamer@sectionmax%
 \else%
 \multiply\@tempdimb by\beamer@subsectionmax%
 \fi%
 \ifdim\@tempdimb>0pt%
 \advance\@tempdimb by 1.1ex%
 \begin{beamercolorbox}[wd=.5\paperwidth,ht= \@tempdimb,right,rightskip=1em]{section in head/foot}%
    \vbox to \@tempdimb{%
   \setcounter{calcmaxsec}{\thesection}\addtocounter{calcmaxsec}{-\beamer@sectionmax}
   %this gives the first and the last headlines 
    \ifnum\thesection=1\vfill{\calcsection{+2}}\fi%
    \ifnum\thesection=\beamer@sectionmax\vfill{\calcsection{-2}}\fi%
    %this tells where the last and nextsection is
    \ifnum\thesection>1\vfill{\calcsection{-1}}\fi%
    \ifnum\thesection>0\vfill\insertsectionhead\fi
    \ifnum\beamer@sectionmax>1{\ifnum\thecalcmaxsec<0  \vfill{\calcsection{1}}\fi}\fi
    \vfill%
   }%
    \end{beamercolorbox}%
    \begin{beamercolorbox}[wd=.5\paperwidth,ht=\@tempdimb]{subsection in head/foot}%
    \vbox to \@tempdimb{%
    \setcounter{calcmaxsubsec}{\thesubsection}\addtocounter{calcmaxsubsec}{-\beamer@subsectionmax}
    \ifnum\thesubsection>1 \vfill{\calcsubsection{-1}}\fi%
    \ifnum\thesubsection>0 \vfill\insertsubsectionhead\fi
    \ifnum\beamer@subsectionmax>1{\ifnum\thecalcmaxsubsec<0\vfill{\calcsubsection{1}}\fi}\fi
    \vfill%
     }%
   \end{beamercolorbox}%
 \fi%
 }%
 \makeatother %%%%%%%%%%%%%%%%%%%%%%

 \begin{document}
 \section{test one}\Testframe
\subsection{sub 1}\Testframe
\subsection{sub 2}\Testframe
\subsection{sub 3}\Testframe
\subsection{sub 4}\Testframe
\subsection{sub 5}\Testframe
\subsection{sub 6}\Testframe
\subsection{sub 7}\Testframe
\section{test two}\Testframe
\subsection{sub 1}\Testframe
\subsection{sub 2}\Testframe
\section{test three}\Testframe
\subsection{sub 1}\Testframe
\subsection{sub 2}\Testframe
\subsection{sub 3}\Testframe
\section{test four}\Testframe
\subsection{sub 1}\Testframe
\subsection{sub 2}\Testframe
\subsection{sub 3}\Testframe
\subsection{sub 4}\Testframe
\section{test five}\Testframe
\subsection{sub 1}\Testframe
\section{test six}\Testframe
\subsection{sub 1}\Testframe
\end{document}

“问题”，第一页

正常外观

最后一页 顺便问一下，有什么办法可以让这个代码预览窗口变小一些吗？

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