介绍
我正在处理一个包含许多图像的文档。如果这些图像位于我告诉 LaTeX 查找的文件夹中，它们就会插入到 .pdf 中。
如果没有这样的图像，它将被默认图像替换。现在，这些图像似乎位于不同的部分。
目标
有时有些部分（和子部分等）仅包含默认图像。我想自动用某种灰色标记目录中这些完全空白的部分（子部分等）的名称。标题本身不应更改。
方法与问题
\documentclass[a4paper, hidelinks]{scrartcl}
\usepackage{graphicx, mwe, hyperref, xcolor}
\usepackage{tocloft} %% ----- could be helpful here?
\newcommand\img[2][]{
\IfFileExists{#2}{
\includegraphics[trim=0 0 0 -5,#1]{#2}
}
{
\includegraphics[trim=0 0 0 -5, width=.4\textwidth]{example-image} %% the default image in this case
}
}
\newcommand{\defineavailablecolor}[2]{
\colorlet{available#1}{#2}
\expandafter\def\csname isavailable#1\endcsname{
\renewcommand{\cftsecfont}{\bfseries\color{available#1}}
\renewcommand{\cftsubsecfont}{\color{available#1}}
\renewcommand{\cftsubsubsecfont}{\color{available#1}}
\renewcommand{\cftparafont}{\color{available#1}}}
}
\makeatletter
\newcommand{\isavailable}[1]{\addtocontents{toc}{\protect\@nameuse {isavailable#1}}}%
\makeatother
\defineavailablecolor{yes}{black}
\defineavailablecolor{no}{gray}
\begin{document}
\tableofcontents
\newpage
\section{First Section} %% ----------- Textcolor in toc should stay black
\subsection{First Subsection} %% ----- Textcolor in toc should stay black
\img[width=.4\textwidth]{example-image-a}
\img[width=.4\textwidth]{example-image-b}
\section{Second Section} %% ----------- Textcolor in toc should stay black
\subsection{Second Subsection} %% ----- Textcolor in toc should stay black
\img[width=.4\textwidth]{example-image-c}
\isavailable{no}
\subsubsection{First Subsubsection}
\img[width=.4\textwidth]{example-image-d}
\isavailable{no}
\section{Third Section} %% ---------- Textcolor in toc should becoma grey
\isavailable{no}
\subsection{Third Subsection} %% ---- Textcolor in toc should become grey
\img[width=.4\textwidth]{example-image-e}
\img[width=.4\textwidth]{example-image-f}
\end{document}
我曾尝试做类似的事情：在 Latex 中使用两种颜色自定义目录。不过，我仍然需要手动标记条目……
关于最后一点：也许可以包含一个 if 语句？它可以测试该部分中的所有图像（等等）是否可用。如果不是这种情况，请为目录条目着色。但我也不知道如何测试多幅图像……
有人知道如何解决这个问题吗？非常感谢！
答案1
这还不是完整的解决方案——由于某种原因，如果下一个\section没有等\subsection，则 ToC 颜色是错误的。
该解决方案用于xcntperchap跟踪每个部分、子部分和子子部分的图像数量。如果此数字为零，则更改 ToC 颜色。
\documentclass[a4paper, hidelinks]{article}
\usepackage{xcolor}
\usepackage{graphicx}
\usepackage{tocloft} %% ----- could be helpful here?
\usepackage{xcntperchap}%
\usepackage{xpatch}%
\newcounter{totalsection}%
\newcounter{totalsubsection}%
\newcounter{totalsubsubsection}%
\newcounter{imagecntr}[section]
\DeclareAssociatedCounters{section}{totalsection}
\DeclareAssociatedCounters{subsection}{totalsubsection}
\DeclareAssociatedCounters{subsubsection}{totalsubsubsection}
\RegisterCounters{section}{imagecntr}%
\RegisterCounters{subsection}{imagecntr}%
\RegisterCounters{subsubsection}{imagecntr}%
\DeclareRobustCommand{\changetocpagenumberfonts}{%
\addtocontents{toc}{\protect\renewcommand\protect\cftsecpagefont{\bfseries\color{\toccolor}}%
\protect\renewcommand\protect\cftsubsecpagefont{\bfseries\color{\toccolor}}%
\protect\renewcommand\protect\cftsubsubsecpagefont{\bfseries\color{\toccolor}}%
\protect\renewcommand\protect\cftparapagefont{\bfseries\color{\toccolor}}}%
}
\makeatletter
\def\@sect#1#2#3#4#5#6[#7]#8{%
\gdef\toccolor{availableyes}%
\ifnum #2>\c@secnumdepth
\let\@svsec\@empty
\else
\refstepcounter{#1}%
\ifnum\ObtainTrackedValueExp[\number\value{total#1}]{#1}{imagecntr} > 0\relax
\gdef\toccolor{availableno}%
\fi%
\changetocpagenumberfonts%
\protected@edef\@svsec{\@seccntformat{#1}\relax}%
\fi
\@tempskipa #5\relax
\ifdim \@tempskipa>\z@
\begingroup
#6{%
\@hangfrom{\hskip #3\relax\@svsec}%
\interlinepenalty \@M #8\@@par}%
\endgroup
\csname #1mark\endcsname{#7}%
\addcontentsline{toc}{#1}{%
\texorpdfstring{%
\ifnum #2>\c@secnumdepth \else
\protect\color{\toccolor}%
\protect\numberline{\csname the#1\endcsname}%
\fi
#7}{#7}%
}%
\else
\def\@svsechd{%
#6{\hskip #3\relax
\@svsec #8}%
\csname #1mark\endcsname{#7}%
\addcontentsline{toc}{#1}{%
\ifnum #2>\c@secnumdepth \else
\texorpdfstring{%
\protect\color{\toccolor}%
\protect\numberline{\csname the#1\endcsname}{#7}}{#7}%
\fi
}}%
\fi
\@xsect{#5}}
\makeatother
\usepackage{hyperref}
\makeatletter
\newcommand\img[2][]{%
\IfFileExists{#2}{%
\includegraphics[trim=0 0 0 -5,#1]{#2}%
}{%
\stepcounter{imagecntr}%
\includegraphics[trim=0 0 0 -5, width=.4\textwidth]{example-image} %% the default image in this case
}%
}
\makeatother
\AtBeginDocument{%
\gdef\toccolor{availableyes}%
}
\newcommand{\defineavailablecolor}[2]{%
\colorlet{available#1}{#2}%
}
\defineavailablecolor{yes}{black}
\defineavailablecolor{no}{gray}
\begin{document}
\tableofcontents
\clearpage
\section{First Section} %% ----------- Textcolor in toc should stay black
\subsection{First Subsection} %% ----- Textcolor in toc should stay black
\img[width=.4\textwidth]{example-image-a}
\img[width=.4\textwidth]{example-image-b}
\section{Second Section} %% ----------- Textcolor in toc should stay black
\subsection{Second Subsection} %% ----- Textcolor in toc should stay black
\img[width=.4\textwidth]{example-image-c}
\subsubsection{First Subsubsection}
\img[width=.4\textwidth]{example-image-d}
\section{Third Section} %% ---------- Textcolor in toc should becoma grey
\subsection{Third Subsection} %% ---- Textcolor in toc should become grey
\img[width=.4\textwidth]{example-image-e}
\img[width=.4\textwidth]{example-image-f}
\section{Fourth section}
\img[width=.4\textwidth]{ente.jpg}
\subsection{Another subsection}
\img[scale=0.3]{ente.jpg}
\subsubsection{Another subsubsection}
\img[scale=0.3]{ente.jpg}
\subsubsection{Another subsubsection}
\img[scale=0.3]{ente.jpg}
\section{And again some section with a default image}
\img[width=.4\textwidth]{example-image-e}
\end{document}
