增加 Beamer 页脚的尺寸

Question

我经常使用 Beamer（特别是马德里主题）。有时，我的“标题”很长。Beamer 将此标题放在底部，但当标题太长时，它会将其截断。我真的很想知道如何增加底部中间矩形页脚的大小。

以下是代码（抱歉，所有的包和命令都在这里）：

\documentclass[t]{beamer} %Add "mathserif" to script math lettering. "t" places all text to start at the top of each slide
\usetheme{Madrid}

%Packages 
\usepackage{amsmath} %Math mode
\usepackage{amssymb} %Math mode
\usepackage{commath}
\usepackage{graphicx} %Including pictures
\usepackage{color} %Define colours
\usepackage{setspace} %Enables double-spacing/variable spacing
\usepackage{pgfplots} %Draw graphs
\usepackage{upgreek} %Insert theta symbol as unitalicized 
\usepackage[version=3]{mhchem} %Chemistry equation mode \ce{}
\usepackage[export]{adjustbox} %Place black borders around images
\usepackage{scrextend} %Used to change font size
\usepackage{caption} %Used to utilize * in caption function
\usepackage{subfig} %Used to place figures side-by-side with sub-captions
\usepackage{siunitx} %SI Units (+ scientific notation)
\usepackage{cancel}
\usepackage{fancybox}
%\usepackage{enumitem} %Making lists
%\usepackage[english]{babel} %Lists with letters

%Erases Beamer Navigation Symbols on the bottom left
\setbeamertemplate{navigation symbols}{} 
%\setbeamertemplate{footline}{}
\captionsetup[subfigure]{labelformat=empty}

%Defined Colours
\definecolor{orangered}{RGB}{255,69,0}
\definecolor{darkgreen}{RGB}{0,100,0} 
\definecolor{firebrick}{RGB}{178, 34, 34}
\definecolor{navy}{RGB}{0,0,128}
\definecolor{lightsteelblue}{RGB}{176,196,222}
\definecolor{steelblue}{RGB}{70,130,180}
\definecolor{darkslateblue}{RGB}{72, 61, 139}
\definecolor{forestgreen}{RGB}{34, 139, 34}
\definecolor{Gold}{RGB}{218,165,32}

%Defined Colour Theme and List Sizing
\setbeamercolor{structure}{fg = Gold}
\setbeamertemplate{navigation symbols}{} 
\setbeamerfont*{itemize/enumerate body}{size=\normalsize}
\setbeamerfont*{itemize/enumerate subbody}{parent=itemize/enumerate body}
\setbeamerfont*{itemize/enumerate subsubbody}{parent=itemize/enumerate body}

%Opening Title Page
\title{Chapter 7 - Absolute Value and Reciprocal Functions}
\subtitle{Section 7.3 - Absolute Value Equations}
\date{}

\begin{document}
    %Slide 1
    \maketitle
\end{document}  

Answer 1

beamer 的 Madrid 主题中使用的 footline 模板取自 infolines 外部主题，由以下代码定义：

\defbeamertemplate*{footline}{infolines theme}
{
  \leavevmode%
  \hbox{%
  \begin{beamercolorbox}[wd=.333333\paperwidth,ht=2.25ex,dp=1ex,center]{author in head/foot}%
    \usebeamerfont{author in head/foot}\insertshortauthor\expandafter\beamer@ifempty\expandafter{\beamer@shortinstitute}{}{~~(\insertshortinstitute)}
  \end{beamercolorbox}%
  \begin{beamercolorbox}[wd=.333333\paperwidth,ht=2.25ex,dp=1ex,center]{title in head/foot}%
    \usebeamerfont{title in head/foot}\insertshorttitle
  \end{beamercolorbox}%
  \begin{beamercolorbox}[wd=.333333\paperwidth,ht=2.25ex,dp=1ex,right]{date in head/foot}%
    \usebeamerfont{date in head/foot}\insertshortdate{}\hspace*{2em}
\insertframenumber{} / \inserttotalframenumber\hspace*{2ex} 
  \end{beamercolorbox}}%
  \vskip0pt%
}

有三个beamercolorboxes，每个的宽度为 的三分之一\paperwidth。如果您想修改框的宽度，您可以通过将此代码复制到文件中并更改参数来定义不同的模板wd。您可以根据需要选择宽度，但应确保它们的总和等于\paperwidth。此外，您必须将定义括在\makeatletter和之间，\makeatother因为@在代码中使用了 。以下 MWE 给出了一个示例（其中已删除示例中未使用的包）。

\documentclass[t]{beamer}
\usetheme{Madrid}

\definecolor{Gold}{RGB}{218,165,32}

%Defined Colour Theme and List Sizing
\setbeamercolor{structure}{fg = Gold}
\setbeamertemplate{navigation symbols}{}

\makeatletter
\defbeamertemplate*{footline}{Dan P theme}
{
  \leavevmode%
  \hbox{%
  \begin{beamercolorbox}[wd=.2\paperwidth,ht=2.25ex,dp=1ex,center]{author in head/foot}%
    \usebeamerfont{author in head/foot}\insertshortauthor\expandafter\beamer@ifempty\expandafter{\beamer@shortinstitute}{}{~~(\insertshortinstitute)}
  \end{beamercolorbox}%
  \begin{beamercolorbox}[wd=.6\paperwidth,ht=2.25ex,dp=1ex,center]{title in head/foot}%
    \usebeamerfont{title in head/foot}\insertshorttitle
  \end{beamercolorbox}%
  \begin{beamercolorbox}[wd=.2\paperwidth,ht=2.25ex,dp=1ex,right]{date in head/foot}%
    \usebeamerfont{date in head/foot}\insertshortdate{}\hspace*{2em}
\insertframenumber{} / \inserttotalframenumber\hspace*{2ex} 
  \end{beamercolorbox}}%
  \vskip0pt%
}
\makeatother
%Opening Title Page
\title{Chapter 7 - Absolute Value and Reciprocal Functions}
\subtitle{Section 7.3 - Absolute Value Equations}
\date{}

\begin{document} %Slide 1
\maketitle
\end{document}