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设置页眉中目录的最大数量

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设置页眉中目录的最大数量

我在 Beamer 中做演示，使用华沙主题。我大约有 5-6 个部分，它们都在每个页面的顶部提及。这使得可用的框架空间更小。我可以将此数字限制为 3 吗？例如，显示上一节、当前节和下一节。

梅威瑟：

\documentclass{beamer}

\mode<presentation>
{
  \setbeamertemplate{background canvas}[vertical shading][bottom=red!10,top=blue!10]

  \usetheme{Warsaw}
  \usefonttheme[onlysmall]{structurebold}
}

\begin{document}
\section{Test 1}
\begin{frame} \end{frame}
\section{Test 2}
\begin{frame} \end{frame}
\section{Test 3}
\begin{frame} \end{frame}
\section{Test 4}
\begin{frame} \end{frame}
\section{Test 5}
\begin{frame} \end{frame}

\end{document}

答案1

版本 1

您好，您可以改变插入导航列表的宏。

    \documentclass{beamer}

    \makeatletter
    \def\insertsectionnavigation#1{%
      \hbox to #1{%
        \vbox{{\usebeamerfont{section in head/foot}\usebeamercolor[fg]{section in head/foot}%
         \vskip0.5625ex%
        \def\slideentry##1##2##3##4##5##6{}%
         \def\sectionentry##1##2##3##4##5{%
           \ifnum##5=\c@part%
           \def\insertsectionhead{##2}%
           \def\insertsectionheadnumber{##1}%
           \def\insertpartheadnumber{##5}%
           \setbox\beamer@tempbox=\hbox{%
             \hyperlink{Navigation##3}{\hbox to #1{%
                 \hskip0.3cm%
                 \ifnum\c@section=##1%
                 {\usebeamertemplate{section in head/foot}}%
                 \else%
                   {%
                   \advance\c@section by  -1 %
                     \ifnum##1 = \c@section%
                     \usebeamertemplate{section in head/foot shaded}%
                    \else%
                    \advance\c@section by  2 %
                     \ifnum##1 = \c@section%
                   \usebeamertemplate{section in head/foot shaded}%
                   \else
                   \fi
                   \fi
                   }%
                 \fi\hskip0.3cm}}}%
           \ht\beamer@tempbox=1.6875ex\dp\beamer@tempbox=0.75ex%
           \box\beamer@tempbox\fi}%
         \dohead\vskip0.5625ex}}\hfil}}
    \makeatother


      \usetheme{Warsaw}
      \usefonttheme[onlysmall]{structurebold}


    \begin{document}
    \section{Test 1}
    \begin{frame} \end{frame}
    \section{Test 2}
    \begin{frame} \end{frame}
    \section{Test 3}
    \begin{frame} \end{frame}
    \section{Test 4}
    \begin{frame} \end{frame}
    \section{Test 5}
    \begin{frame} \end{frame}

    \end{document}

Here two new conditionals are introduced, which check for the distance between the active section (stored in `\c@section`) and the printed sections. 

The result is this:

![enter image description here][1]

版本 2

此版本更适合三行的大小。请注意，彩色投影框的高度是手动调整的。

\documentclass{beamer}
  \usetheme{Warsaw}
  \usefonttheme[onlysmall]{structurebold}


\makeatletter
       \newcount\c@p
       \newcount\c@m
\def\insertsectionnavigation#1{%
  \hbox to #1{%
    \vbox{{\usebeamerfont{section in head/foot}\usebeamercolor[fg]{section in head/foot}%
     \vskip0.5625ex%
    \def\slideentry##1##2##3##4##5##6{}%
     \def\sectionentry##1##2##3##4##5{%
       \ifnum##5=\c@part%
       \def\insertsectionhead{##2}%
       \def\insertsectionheadnumber{##1}%
       \def\insertpartheadnumber{##5}%
       \c@p=\c@section%
       \c@m=\c@section%
       \advance\c@m by -1 %
       \advance\c@p by 1 %
             \ifnum\c@section=##1%
               \setbox\beamer@tempbox=\hbox{%
              \hyperlink{Navigation##3}{\hbox to #1{%
             {\hskip0.3cm\usebeamertemplate{section in head/foot}\hskip0.3cm}}}}%
             \else%
                 \ifnum##1=\c@m%
                 \setbox\beamer@tempbox=\hbox{%
                  \hyperlink{Navigation##3}{\hbox to #1{%
                 {\hskip0.3cm\usebeamertemplate{section in head/foot shaded}\hskip0.3cm}}}}
                 %
                \else%
                 \ifnum##1=\c@p%
                 \setbox\beamer@tempbox=\hbox{%
                  \hyperlink{Navigation##3}{\hbox to #1{%
               {\hskip0.3cm\usebeamertemplate{section in head/foot shaded}\hskip0.3cm}}}}%
               %
               \else%
               %
               \fi%
               \fi%
               %
            \fi%%
            %

      \ht\beamer@tempbox=1.6875ex%
       \dp\beamer@tempbox=0.75ex%
       \box\beamer@tempbox\fi}%
     \dohead\vskip0.5625ex}}\hfil}}


\setbeamertemplate{headline}%{split theme} % full manual adjustment
{%
  \leavevmode%
  \@tempdimb=3em%
  \ifdim\@tempdimb>0pt%
    \advance\@tempdimb by 1.825ex%
    \begin{beamercolorbox}[wd=.5\paperwidth,ht=\@tempdimb]{section in head/foot}%
      \vbox to\@tempdimb{\vfil\insertsectionnavigation{.5\paperwidth}\vfil}%
    \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

\begin{document}
\section{Test 1}
\begin{frame} \end{frame}
\section{Test 2}
\begin{frame} \end{frame}
\section{Test 3}
\begin{frame} \end{frame}
\section{Test 4}
\begin{frame} \end{frame}
\section{Test 5}
\begin{frame} \end{frame}

\end{document}

再次，if 结构选择所需的条目。但在这种情况下，框仅在需要时才填充。我还引入了两个辅助变量c@p，c@m以避免过于复杂的分组。这呈现为：

在此处输入图片描述

下面的框架将如下所示：

在此处输入图片描述

版本 3

现在可随时提供三种导航元素：

\documentclass{beamer}
  \usetheme{Warsaw}
  \usefonttheme[onlysmall]{structurebold}


\makeatletter
       \newcount\c@p
       \newcount\c@m
              \newcount\c@pp
       \newcount\c@mm
\def\insertsectionnavigation#1{%
  \hbox to #1{%
    \vbox{{\usebeamerfont{section in head/foot}\usebeamercolor[fg]{section in head/foot}%
     \vskip0.5625ex%
    \def\slideentry##1##2##3##4##5##6{}%
     \def\sectionentry##1##2##3##4##5{%
       \ifnum##5=\c@part%
       \def\insertsectionhead{##2}%
       \def\insertsectionheadnumber{##1}%
       \def\insertpartheadnumber{##5}%
       \c@p=\c@section%
       \c@m=\c@section%
      \c@pp=\c@section%
       \c@mm=\c@section%
       \advance\c@m by -1 %
       \advance\c@p by 1 %
       \advance\c@mm by -2 %
       \advance\c@pp by 2 %
       %     
       \ifnum \c@section=1
                    \ifnum\c@section=##1%
               \setbox\beamer@tempbox=\hbox{%
              \hyperlink{Navigation##3}{\hbox to #1{%
             {\hskip0.3cm\usebeamertemplate{section in head/foot}\hskip0.3cm}}}}%
             \else%
                 \ifnum##1=\c@p%
                 \setbox\beamer@tempbox=\hbox{%
                  \hyperlink{Navigation##3}{\hbox to #1{%
                 {\hskip0.3cm\usebeamertemplate{section in head/foot shaded}\hskip0.3cm}}}}
                 %
                \else%
                 \ifnum##1=\c@pp%
                 \setbox\beamer@tempbox=\hbox{%
                  \hyperlink{Navigation##3}{\hbox to #1{%
               {\hskip0.3cm\usebeamertemplate{section in head/foot shaded}\hskip0.3cm}}}}%
               %
               \else%
               %
               \fi%
               \fi%
               %
            \fi%%  
         \else%
  \ifnum \c@section=\beamer@sectionmax
               \ifnum\c@section=##1%
               \setbox\beamer@tempbox=\hbox{%
              \hyperlink{Navigation##3}{\hbox to #1{%
             {\hskip0.3cm\usebeamertemplate{section in head/foot}\hskip0.3cm}}}}%
             \else%
                 \ifnum##1=\c@m%
                 \setbox\beamer@tempbox=\hbox{%
                  \hyperlink{Navigation##3}{\hbox to #1{%
                 {\hskip0.3cm\usebeamertemplate{section in head/foot shaded}\hskip0.3cm}}}}
                 %
                \else%
                 \ifnum##1=\c@mm%
                 \setbox\beamer@tempbox=\hbox{%
                  \hyperlink{Navigation##3}{\hbox to #1{%
               {\hskip0.3cm\usebeamertemplate{section in head/foot shaded}\hskip0.3cm}}}}%
               %
               \else%
               %
               \fi%
               \fi%
               %
            \fi%%
       \else%
             \ifnum\c@section=##1%
               \setbox\beamer@tempbox=\hbox{%
              \hyperlink{Navigation##3}{\hbox to #1{%
             {\hskip0.3cm\usebeamertemplate{section in head/foot}\hskip0.3cm}}}}%
             \else%
                 \ifnum##1=\c@m%
                 \setbox\beamer@tempbox=\hbox{%
                  \hyperlink{Navigation##3}{\hbox to #1{%
                 {\hskip0.3cm\usebeamertemplate{section in head/foot shaded}\hskip0.3cm}}}}
                 %
                \else%
                 \ifnum##1=\c@p%
                 \setbox\beamer@tempbox=\hbox{%
                  \hyperlink{Navigation##3}{\hbox to #1{%
               {\hskip0.3cm\usebeamertemplate{section in head/foot shaded}\hskip0.3cm}}}}%
               %
               \else%
               %
               \fi%
               \fi%
               %
            \fi%%
            %
            \fi
            \fi
            %

      \ht\beamer@tempbox=1.6875ex%
       \dp\beamer@tempbox=0.75ex%
       \box\beamer@tempbox\fi}%
     \dohead\vskip0.5625ex}}\hfil}}


\setbeamertemplate{headline}%{split theme} % full manual adjustment
{%
  \leavevmode%
  \@tempdimb=3em%
  \ifdim\@tempdimb>0pt%
    \advance\@tempdimb by 1.825ex%
    \begin{beamercolorbox}[wd=.5\paperwidth,ht=\@tempdimb]{section in head/foot}%
      \vbox to\@tempdimb{\vfil\insertsectionnavigation{.5\paperwidth}\vfil}%
    \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

\begin{document}
\section{Test 1}
\begin{frame} \end{frame}
\section{Test 2}
\begin{frame} \end{frame}
\section{Test 3}
\begin{frame} \end{frame}
\section{Test 4}
\begin{frame} \end{frame}
\section{Test 5}
\begin{frame} \end{frame}

\end{document}

需要说明的是，这是硬编码的。这仅适用于 3 个元素，而且用途不大。它的作用很简单：检查当前帧是第一帧还是最后一帧，并据此插入导航。

我想补充一点，这种导航方式对读者很不友好。读者必须非常仔细地观察才能理解。

第一张幻灯片如下所示：

在此处输入图片描述

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