Beamer metropolis：在框架标题中对齐图像/将图像高度设置为框架标题高度

Question

我正在尝试使用该包对齐 Beamers Metropolis 主题标题中的某些图像tikz。（也许还有更好的方法。）

现在，我使用yshift和对齐它们xshift。但是，使用这种手动方法无法完美对齐它们，因此在高分辨率演示中看起来很奇怪，您会看到偏移：

\usepackage{tikz}
% headline images
\addtobeamertemplate{frametitle}{}{%
\begin{tikzpicture}[remember picture,overlay]
\node[anchor=north east,yshift=4.24pt, xshift = 4.2pt] at (current page.north east) {\includegraphics[height=1cm]{img/image2.png}};
\end{tikzpicture}}

\addtobeamertemplate{frametitle}{}{%
\begin{tikzpicture}[remember picture,overlay]
\node[anchor=north east,yshift=4.13pt, xshift = -64.8pt] at (current page.north east) {\includegraphics[height=1cm]{img/image1.png}};
\end{tikzpicture}}

根据大都市文件：

\newlength{\metropolis@frametitle@padding}
\setlength{\metropolis@frametitle@padding}{2.2ex}
\newcommand{\metropolis@frametitlestrut@start}{
\rule{0pt}{\metropolis@frametitle@padding +%
\totalheightof{% \ifcsdef{metropolis@frametitleformat}{\metropolis@frametitleformat X}{X}% }%
}% }
\newcommand{\metropolis@frametitlestrut@end}{
 \rule[-\metropolis@frametitle@padding]{0pt}{\metropolis@frametitle@padding}
}
\defbeamertemplate{frametitle}{plain}{%
  \nointerlineskip%
  \begin{beamercolorbox}[%
      wd=\paperwidth,%
      sep=0pt,%
      leftskip=\metropolis@frametitle@padding,%
      rightskip=\metropolis@frametitle@padding,%
    ]{frametitle}%
 \metropolis@frametitlestrut@start\insertframetitle\metropolis@frametitlestrut@end%
  \end{beamercolorbox}%
}

对我来说可能的解决方案是：

1. 将图像高度设置为框架标题的高度并进行手动水平对齐
2. 将两个高度都设置为固定值（例如 1cm）
3. 框架标题中图像放置的完全不同的方法

MWE（使用 XeLaTeX 编译）：

\documentclass[unknownkeysallowed]{beamer}\usepackage[]{graphicx}\usepackage[]{color}
\usetheme[numbering = fraction]{metropolis} 

\usepackage[american]{babel}

% frametitle images
\addtobeamertemplate{frametitle}{}{%
\begin{tikzpicture}[remember picture,overlay]
\node[anchor=north east,yshift=4.24pt, xshift = 4.2pt] at (current page.north east) {\includegraphics[height=1cm]{example-image-b}};
\end{tikzpicture}}

\addtobeamertemplate{frametitle}{}{%
\begin{tikzpicture}[remember picture,overlay]
\node[anchor=north east,yshift=4.13pt, xshift = -44.8pt] at (current page.north east) {\includegraphics[height=1cm]{example-image-c}};
\end{tikzpicture}}

\begin{document}

% ##############################################################################
\section{Introduction} 

% ------------------------------------------------------------------------------
\begin{frame}{Introduction}
test
\end{frame}

\end{document}

Answer 1

下面的解决方案有点丑陋，因为它首先测量不带徽标的 frametitle 的高度，然后将该高度用于徽标，所以基本上所有代码都存在两次......

\documentclass[unknownkeysallowed]{beamer}
%\usepackage{graphicx}
%\usepackage{color}
\usetheme[numbering = fraction]{metropolis} 

\usepackage[american]{babel}

\makeatletter
\newsavebox{\mybox}
\setbeamertemplate{frametitle}{%
  \nointerlineskip%
  \savebox{\mybox}{%
      \begin{beamercolorbox}[%
          wd=\paperwidth,%
          sep=0pt,%
          leftskip=\metropolis@frametitle@padding,%
          rightskip=\metropolis@frametitle@padding,%
        ]{frametitle}%
      \metropolis@frametitlestrut@start\insertframetitle\metropolis@frametitlestrut@end%
      \end{beamercolorbox}%
    }
  \begin{beamercolorbox}[%
      wd=\paperwidth,%
      sep=0pt,%
      leftskip=\metropolis@frametitle@padding,%
      rightskip=\metropolis@frametitle@padding,%
    ]{frametitle}%
  \metropolis@frametitlestrut@start\insertframetitle\metropolis@frametitlestrut@end%
  \hfill%
  \raisebox{-\metropolis@frametitle@padding}{\includegraphics[height=\dimexpr\ht\mybox+\metropolis@frametitle@padding\relax]{example-image}}%
  ~%
    \raisebox{-\metropolis@frametitle@padding}{\includegraphics[height=\dimexpr\ht\mybox+\metropolis@frametitle@padding\relax]{example-image-a}}%
    \hspace*{-\metropolis@frametitle@padding}
  \end{beamercolorbox}%
}
\makeatother

\begin{document}
\begin{frame}
\frametitle{Introduction}
test
\end{frame}
\end{document}

---

如果有人想将此解决方案与框架标题下的进度条结合起来：

\documentclass[unknownkeysallowed]{beamer}
%\usepackage{graphicx}
%\usepackage{color}
\usetheme[numbering = fraction, progressbar=frametitle]{metropolis} 

\usepackage[american]{babel}

\makeatletter
\newsavebox{\mybox}
\setbeamertemplate{frametitle}{%
  \nointerlineskip%
  \savebox{\mybox}{%
      \begin{beamercolorbox}[%
          wd=\paperwidth,%
          sep=0pt,%
          leftskip=\metropolis@frametitle@padding,%
          rightskip=\metropolis@frametitle@padding,%
        ]{frametitle}%
      \metropolis@frametitlestrut@start\insertframetitle\metropolis@frametitlestrut@end%
      \end{beamercolorbox}%
    }
  \begin{beamercolorbox}[%
      wd=\paperwidth,%
      sep=0pt,%
      leftskip=\metropolis@frametitle@padding,%
      rightskip=\metropolis@frametitle@padding,%
    ]{frametitle}%
  \metropolis@frametitlestrut@start\insertframetitle\metropolis@frametitlestrut@end%
  \hfill%
  \raisebox{-\metropolis@frametitle@padding}{\includegraphics[height=\dimexpr\ht\mybox+\metropolis@frametitle@padding\relax]{example-image}}%
  ~%
    \raisebox{-\metropolis@frametitle@padding}{\includegraphics[height=\dimexpr\ht\mybox+\metropolis@frametitle@padding\relax]{example-image-a}}%
    \hspace*{-\metropolis@frametitle@padding}
  \end{beamercolorbox}%
}

\addtobeamertemplate{frametitle}{}{%
    \usebeamertemplate*{progress bar in head/foot}
}
\makeatother

\begin{document}
\begin{frame}
\frametitle{Introduction}
test
\end{frame}

\begin{frame}
\frametitle{Introduction}
test
\end{frame}

\end{document}

Answer 2

更新

终于！解决方案不需要复制粘贴frametitle模板定义的当前定义，即对此定义更新具有鲁棒性！

\newsavebox{\mybox}
\makeatletter
\addtobeamertemplate{frametitle}{
    \begin{lrbox}{\mybox}
        \begin{minipage}{1.00\textwidth}
}{
        \end{minipage}
    \end{lrbox}
    \nointerlineskip
    \usebox{\mybox}
    \tikzexternaldisable
    \tikz[remember picture,overlay,every node/.style={inner sep=0,outer sep=0}]
        \node[anchor=north east] at (current page.north east)
        {
            \includegraphics[height=\dimexpr\ht\mybox+\metropolis@frametitle@padding\relax]{example-image}
            ~%
            \includegraphics[height=\dimexpr\ht\mybox+\metropolis@frametitle@padding\relax]{example-image-a}
        }
    ;
    \tikzexternalenable
}
\makeatletter

不幸的是，\appendix仍然会取消这个的效果\addtobeamertemplate，所以在命令之后重做\appendix。

旧答案

接受答案中的解决方案破坏了框架标题中的进度条。进度条消失了。所以我重写了一点：

\makeatletter
\@ifundefined{mybox}{%
    \newsavebox{\mybox}%
}{}%
\addtobeamertemplate{frametitle}{%
    \savebox{\mybox}{%
        \begin{beamercolorbox}[%
            wd=\paperwidth,%
            sep=0pt,%
            leftskip=\metropolis@frametitle@padding,%
            rightskip=\metropolis@frametitle@padding,%
        ]{frametitle}%
            \metropolis@frametitlestrut@start%
            \insertframetitle%
            \nolinebreak%
            \metropolis@frametitlestrut@end%
        \end{beamercolorbox}%
    }%
}{%
    \tikzexternaldisable%
    \tikz[remember picture,overlay,every node/.style={inner sep=0,outer sep=0}]
        \node[anchor=north east] at (current page.north east)
        {
            \includegraphics[height=\dimexpr\ht\mybox+\metropolis@frametitle@padding\relax]{example-image}
            ~%
            \includegraphics[height=\dimexpr\ht\mybox+\metropolis@frametitle@padding\relax]{example-image-a}
        }
    ;
}
\makeatother

如果有人能以某种方式用扩展到模板当前定义的宏替换frametitle里面的 beamer 模板的硬编码复制粘贴定义，那就太好了。\savebox