加载 beamertemplate 后更改 beamer 大小

Question

我正在为 beamer 模板编写代码。我有两个不同的模板frametitle，其中一个使框架有点不对称。因此，我将text margin left和分别设置text margin right为8ex和5ex。另一个更对称，因此我希望之后\setbeamertemplate{frametitle}[second template]所有框架中的文本都居中。

当然我不能\setbeamersize在文档正文中使用。使用\newgeometry会移动整个框架。我不知道如何adjustwidth为所有框架设置。

这是 MWE

\documentclass[aspectratio=169]{beamer}
\usepackage[english]{babel}

\setbeamercolor{frametitle}{fg=white, bg=blue!20!black}

\defbeamertemplate{frametitle}{plain}{%
  \nointerlineskip%
  \begin{beamercolorbox}[%
      wd=\paperwidth,%
      sep=2ex,%
      leftskip=.2ex,%
      rightskip=.2ex,%
    ]{frametitle}%%
  \insertframetitle%
  \end{beamercolorbox}%
}

\makeatletter
\defbeamertemplate{frametitle}{leftside}{%
\nointerlineskip%
    \hspace{\dimexpr-\beamer@leftmargin - 1cm\relax}% 
        \begin{beamercolorbox}[%
          wd=1cm,%
          sep=2ex,%
          leftskip=.2ex,%
          rightskip=.2ex,%
        ]{example text}%
        \vphantom{F}
      \end{beamercolorbox}%
       \smash{%
        \rotatebox[origin=rt]{90}{%
          \begin{beamercolorbox}[%
              wd=\paperheight,%
              sep=2ex,%
              leftskip=.2ex,%
              rightskip=.2ex,%
            ]{frametitle}%
            \insertframetitle
          \end{beamercolorbox}%
        }%
    }%
    \vskip-3ex
}
\makeatother

\setbeamersize{text margin left=8ex, text margin right=3ex}
\begin{document}
\setbeamertemplate{frametitle}[leftside]
\begin{frame}{Frame Title}
    The text here is placed correctly\hfill the right margin is ok
\end{frame}

\setbeamertemplate{frametitle}[plain]
\begin{frame}{Frame Title}
    The text here is not ok \hfill too close to the right margin\\
    \hspace{-2.5ex}Here it is ok\hfill and the right margin is also ok\hspace{2.5ex}
\end{frame}
\end{document}

更新

我在序言中添加了以下代码

\usepackage{changepage}
\newlength{\leftshift}
\setlength{\leftshift}{-1.5ex}
\makeatletter
\pretocmd\endbeamer@frameslide
  {\end{adjustwidth}}
  {}
  {}
\apptocmd\beamer@frameslide
  {\begin{adjustwidth}{\leftshift}{-\leftshift}}
  {}
  {}
\makeatother

\leftshift每次加载新模板时都会更改。它工作得很好，尽管内联frametitle被读取为框架的文本（我的意思是\begin{frame}{This text is read inside text area}。如果有人能修复它我会很高兴。

Answer 1

如果您的文本宽度保持不变，并且您不需要导航符号或其他静态元素，则可以通过更改以下内容来解决\hoffset：

\documentclass[aspectratio=169]{beamer}
\usepackage[english]{babel}

\setbeamertemplate{navigation symbols}{}
\setbeamercolor{frametitle}{fg=white, bg=blue!20!black}

\makeatletter
\defbeamertemplate{frametitle}{plain}{%
  \nointerlineskip%
  \hspace*{2.3ex}%
  \begin{beamercolorbox}[%
      wd=\paperwidth,%
      sep=2ex,%
      leftskip=.2ex,%
      rightskip=.2ex,%
    ]{frametitle}%%
  \insertframetitle%
  \end{beamercolorbox}%
}[action]{
\hoffset=-3ex
}


\defbeamertemplate{frametitle}{leftside}{%
\nointerlineskip%
    \hspace{\dimexpr-\beamer@leftmargin - 1cm\relax}% 
        \begin{beamercolorbox}[%
          wd=1cm,%
          sep=2ex,%
          leftskip=.2ex,%
          rightskip=.2ex,%
        ]{example text}%
        \vphantom{F}
      \end{beamercolorbox}%
       \smash{%
        \rotatebox[origin=rt]{90}{%
          \begin{beamercolorbox}[%
              wd=\paperheight,%
              sep=2ex,%
              leftskip=.2ex,%
              rightskip=.2ex,%
            ]{frametitle}%
            \insertframetitle
          \end{beamercolorbox}%
        }%
    }%
    \vskip-3ex
}[action]{
\hoffset=0ex
}
\makeatother


\setbeamersize{text margin left=8ex, text margin right=3ex}


\begin{document}
\setbeamertemplate{frametitle}[leftside]
\begin{frame}
\frametitle{Frame Title}
    The text here is placed correctly\hfill the right margin is ok
\end{frame}

\setbeamertemplate{frametitle}[plain]
\begin{frame}
\frametitle{Frame Title}
    The text here is not ok \hfill too close to the right margin
\end{frame}

\begin{frame}
\frametitle{Frame Title}
    The text here is not ok \hfill too close to the right margin
\end{frame}

\setbeamertemplate{frametitle}[leftside]
\begin{frame}
\frametitle{Frame Title}
    The text here is placed correctly\hfill the right margin is ok
\end{frame}
\end{document}