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自定义 Beamer 主题存在问题

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自定义 Beamer 主题存在问题

从 Claudio Fiandrino 的回答开始（从头开始设计自定义 Beamer 主题)，我正在尝试为我的论文展示创建自己的beamer主题。我对它很满意，但我想解决一些问题：

  • 在封面，我使用 设置了上边距和标题之间的距离\vskip<..>cm，但每次修改标题时我都必须更改它（例如，如果标题跨越两行，我必须减小它），以便标题的基线与代码中可以看到的“垂直蓝线”的末端对齐。有没有办法自动设置它？
  • 如果框架标题（和字幕）跨越两行，新行将不会像第一行（其缩进为\SideMargin）那样缩进；我尝试使用\parbox，但无法使其正常工作。

我尝试尽可能地清理代码，以便仅显示导致这些问题的部分。标题页背景是一张图片： 标题页.png 在此处输入图片描述 定义主题的所有文件是：

beamercolorthemePOLIMI.sty

\mode<presentation>

% Colors
% Footer
\definecolor{POLIblue}{RGB}{0,51,102}
\definecolor{POLIblue1}{RGB}{26,72,118}
\definecolor{POLIblue2}{RGB}{49,91,132}
\definecolor{POLIblue3}{RGB}{111,140,169}
\definecolor{POLIblue4}{RGB}{154,175,195}
\definecolor{POLIblue5}{RGB}{168,187,203}
\definecolor{POLIblue6}{RGB}{159,178,198}
\definecolor{POLIblue7}{RGB}{148,170,191}
\definecolor{POLIblue8}{RGB}{102,133,163}

% Header
\definecolor{POLIblue9}{RGB}{177,202,226}
\definecolor{POLIblue10}{RGB}{103,154,204}
\definecolor{POLIblue11}{RGB}{2,53,102}
\definecolor{POLIblue12}{RGB}{181,186,194}

% Page number
\definecolor{POLIpage}{RGB}{2,62,109}

% Settings
\setbeamercolor*{title page header}{fg=POLIblue}
\setbeamercolor*{author}{fg=black}
\setbeamercolor*{date}{fg=POLIblue}
\setbeamercolor*{item}{fg=POLIblue}
\setbeamercolor*{frametitle}{fg=POLIblue}
\setbeamercolor*{framesubtitle}{fg=POLIblue1}
\setbeamercolor*{page number in head/foot}{fg=POLIpage}
\setbeamercolor*{author in head/foot}{fg=POLIblue}

\mode<all>

beamerinnerthemePOLIMI.sty

\mode<presentation>

\usetikzlibrary{positioning}

\newlength\SideMargin
\setlength\SideMargin{1cm}

\newlength\TopMargin
\setlength\TopMargin{1cm}

\newlength\ImageWidth
\setlength\ImageWidth{\dimexpr\the\paperwidth-2\SideMargin\relax}

\setbeamertemplate{background}{
    \begin{tikzpicture}
    \useasboundingbox (0,0) rectangle(\the\paperwidth,\the\paperheight);

    \ifnum\thepage=1\relax{%

    % Title page background
    \node[anchor=north west,inner sep=0pt,minimum size=0pt] at(\SideMargin,{\the\paperheight-\TopMargin}){\includegraphics[width=\ImageWidth]{TitlePage.png}};

    %%%% VERTICAL BLU LINE - I would like to have the bottom of the title aligned with the end of this line
    \draw[color=POLIblue,line width=0.5pt] (8.186,10)--node[pos=1,inner sep=0pt,minimum size=0pt](b){}(8.186,6);
    }
  \else{%
   \fill[white,opacity=1] (0,0) rectangle(\the\paperwidth,\the\paperheight);
    }
    \fi
  \end{tikzpicture}
}

\setbeamerfont{title}{size=\normalfont\Large,family={\fontfamily{phv}},series=\bfseries}

\setbeamerfont{author}{size=\normalfont\normalsize,family={\fontfamily{phv}}}

\setbeamerfont{date}{size=\normalfont\small,family={\fontfamily{phv}}}

% Title page
\defbeamertemplate*{title page}{POLIMI}[1][]
{
   \vskip10.4cm% TITLE POSITIONING
    \begin{beamercolorbox}[wd=25cm,leftskip=7.85cm,sep=8pt,#1]{title page header}
      \usebeamerfont{title}\inserttitle\par%
    \end{beamercolorbox}%
    \vskip0.75cm%
    \begin{beamercolorbox}[wd=25cm,leftskip=8.5cm,#1]{author}
      \usebeamerfont{author}\insertauthor%
    \end{beamercolorbox}
     \vskip1cm%
    \begin{beamercolorbox}[wd=25cm,leftskip=8.5cm,#1]{date}
      \ifx\insertdate\@empty%
      \else
      \usebeamerfont{date}\insertdate%
      \fi
    \end{beamercolorbox}
  \vfill
}

\mode<all>

beamerouterthemePOLIMI.sty

\mode<presentation>

\setbeamerfont{frametitle}{size=\normalfont\Large,family={\fontfamily{phv}},series=\bfseries}

\setbeamerfont{framesubtitle}{size=\normalfont\large,family={\fontfamily{phv}}}

\setbeamerfont{page number in head/foot}{size=\normalfont\normalsize,family={\fontfamily{phv}},series=\bfseries}

% Frame title
\defbeamertemplate*{frametitle}{POLIMI}[1][]
{
    \vskip\TopMargin%
    \begin{beamercolorbox}[wd=\paperwidth,ht=1cm]{frametitle} 
    \begin{tikzpicture}
    \useasboundingbox[fill=white](0,0) rectangle(\the\paperwidth,1.2);

    % Rectangles, line and frame number
    \fill[POLIblue9] (19.2,0.75) rectangle (20.2,1);
    \fill[POLIblue10] (20.4,0.75) rectangle (21.4,1);
    \fill[POLIblue11] (21.6,0.75) rectangle (\the\paperwidth-\SideMargin,1);
    \draw[POLIblue12] (19.2,-0.45) -- node[pos=0.1,above=0.2cm](PageN){%
        \begin{beamercolorbox}[wd=1cm,ht=1ex,dp=0ex,left]{page number in head/foot}%
        \usebeamerfont{page number in head/foot}\insertframenumber{}%
        \end{beamercolorbox}} (\the\paperwidth-\SideMargin,-0.45);

    % FRAME TITLE AND SUBTITLE
    \ifx\insertframesubtitle\@empty%
        {\node[anchor=west] at (\SideMargin-1.25cm,0.25){%
            \begin{beamercolorbox}[wd=0.7\paperwidth,ht=5ex,dp=1ex,left]{frametitle}%
            \usebeamerfont{frametitle}\hskip\SideMargin\insertframetitle%
            %\parbox[t]{\dimexpr0.9\paperwidth-1em\relax}{\insertsection}%
            \end{beamercolorbox}};
        }%
    \else%
        {\node[anchor=west] at (\SideMargin-1.25cm,0.6){%
            \begin{beamercolorbox}[wd=0.7\paperwidth,ht=5ex,dp=1ex,left]{frametitle}%
            \usebeamerfont{frametitle}\hskip\SideMargin\insertframetitle%
            \end{beamercolorbox}};
        \node[anchor=west] at (\SideMargin-1.25cm,-0.4){%
            \begin{beamercolorbox}[wd=0.7\paperwidth,ht=5ex,dp=1ex,left]{framesubtitle}%
            \usebeamerfont{framesubtitle}\hskip\SideMargin\insertframesubtitle%
            \end{beamercolorbox}};%
        }%
    \fi
  \end{tikzpicture}
  \end{beamercolorbox}
  \vskip10mm%
}

\mode<all>

beamerthemePOLIMI.sty

\mode<presentation>

%%%% Requirements

% Page layout
\RequirePackage{geometry}

% Tikz pictures
\RequirePackage{tikz}

% Font type
\usepackage[T1]{fontenc}
\RequirePackage{helvet}

% Justified text
\RequirePackage{ragged2e} 
\justifying

% Settings
\geometry{paperwidth=254.0mm,
          paperheight=190.5mm,
          left=0mm,
          right=0mm,
          top=0mm,
          bottom=0mm}
\setbeamersize{text margin left=15mm,text margin right=15mm}

% Themes
\useinnertheme{POLIMI}
\useoutertheme{POLIMI}
\usecolortheme{POLIMI}

\setbeamertemplate{navigation symbols}{}

\mode<all>

最后，展示这些问题的演示文件：

\documentclass[17pt]{beamer}
\let\Tiny=\tiny

\usepackage{lipsum}

\title{Title, that might span one or two lines (or even more)}
\date{Now}
\author[Me]{Me}

\usetheme{POLIMI}

\begin{document}

\begin{frame}
    \titlepage
\end{frame}

\begin{frame}{A quite long frame title that cannot be shortened}
    \lipsum[1]
\end{frame}

\begin{frame}{Another quite long frame title that cannot be shortened}
    \framesubtitle{The same might happen for the frame subtitle, if it's too long}
    \lipsum[1]
\end{frame}

\end{document}

答案1

这只是您可以考虑的第一个想法。不要将垂直线固定为背景的一部分，而是在构建标题时绘制它。命令\rule将完成这项工作。标题可以包含在底部对齐中\parbox。

我beamerinnerthemePOLIMI.sty按照这种方式修改了，结果如下

在此处输入图片描述

我认为类似方法\parbox可以应用于常规帧的标题和副标题，但我还没有测试过。

修改的beamerinnerthemePOLIMI.sty

\mode<presentation>

\usetikzlibrary{positioning}

\newlength\SideMargin
\setlength\SideMargin{1cm}

\newlength\TopMargin
\setlength\TopMargin{1cm}

\newlength\ImageWidth
\setlength\ImageWidth{\dimexpr\the\paperwidth-2\SideMargin\relax}

\setbeamertemplate{background}{
    \begin{tikzpicture}
    \useasboundingbox (0,0) rectangle(\the\paperwidth,\the\paperheight);

    \ifnum\thepage=1\relax{%

    % Title page background
    \node[anchor=north west,inner sep=0pt,minimum size=0pt] at(\SideMargin,{\the\paperheight-\TopMargin}){\includegraphics[width=\ImageWidth]{TitlePage.png}};

%    %%%% VERTICAL BLU LINE - I would like to have the bottom of the title aligned with the end of this line
%    \draw[color=POLIblue,line width=0.5pt] (8.186,10)--node[pos=1,inner sep=0pt,minimum size=0pt](b){}(8.186,6);
%    }
%  \else{%
%   \fill[white,opacity=1] (0,0) rectangle(\the\paperwidth,\the\paperheight);
    }
    \fi
  \end{tikzpicture}
}

\setbeamerfont{title}{size=\normalfont\Large,family={\fontfamily{phv}},series=\bfseries}

\setbeamerfont{author}{size=\normalfont\normalsize,family={\fontfamily{phv}}}

\setbeamerfont{date}{size=\normalfont\small,family={\fontfamily{phv}}}

% Title page
\defbeamertemplate*{title page}{POLIMI}[1][]
{
    \vskip5.4cm% TITLE POSITIONING
    \begin{beamercolorbox}[wd=25cm,leftskip=7.85cm,sep=8pt,#1]{title page header}
      \rule{.5pt}{4cm}\ \usebeamerfont{title}\parbox[b]{15cm}{\inserttitle}\par%
    \end{beamercolorbox}%
    \vskip0.75cm%
    \begin{beamercolorbox}[wd=25cm,leftskip=8.5cm,#1]{author}
      \usebeamerfont{author}\insertauthor%
    \end{beamercolorbox}
     \vskip1cm%
    \begin{beamercolorbox}[wd=25cm,leftskip=8.5cm,#1]{date}
      \ifx\insertdate\@empty%
      \else
      \usebeamerfont{date}\insertdate%
      \fi
    \end{beamercolorbox}
  \vfill
}

\mode<all>

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