在使用文档类书籍的项目中，我有非常长的部分标题，它们在目录中沿两行分开。我希望它们排列在左侧，紧挨着“第 X 部分”。我的部分在目录中没有页码，我还在目录中的部分标题周围添加了黑线，我想找到解决我的排列问题的方法，而不会破坏这两个东西。一个基本的工作示例如下所示：
\documentclass[11pt,a4paper,twoside]{book}
\usepackage[paper=a4paper,left=25mm,right=25mm,top=35mm,bottom=40mm]{geometry}
%Black lines around parts in TOC
\usepackage{titletoc}
\usepackage{chngcntr}
\def\contentsname{{C\MakeLowercase{ontents}}}
\titlecontents{part}[0pt]{\bfseries\protect\addvspace{15pt}\titlerule\addvspace{1.5ex}}%
{}{\partname~}{}[\addvspace{0.7ex}\titlerule\addvspace{1.5ex}]
\begin{document}
\tableofcontents
\part{This is a very very very very very very very very very very very very long part title}
\chapter{Chapter 1}
\section{Section 1.1}
\chapter{Chapter 2}
\section{Section 2.1}
\section{2.2}
\end{document}
输出如下：
现在，我希望部件标题的第二行与标题名称的第一行对齐。我想要的基本上是这样的
\documentclass[11pt,a4paper,twoside]{book}
\usepackage[paper=a4paper,left=25mm,right=25mm,top=35mm,bottom=40mm]{geometry}
%Black lines around parts in TOC
\usepackage{titletoc}
\usepackage{chngcntr}
\def\contentsname{{C\MakeLowercase{ontents}}}
\titlecontents{part}[0pt]{\bfseries\protect\addvspace{15pt}\titlerule\addvspace{1.5ex}}%
{}{\partname~}{}[\addvspace{0.7ex}\titlerule\addvspace{1.5ex}]
\begin{document}
\tableofcontents
\part*{This is a very very very very very very very very very very very very long part title}
\addcontentsline{toc}{part}{I\hspace*{0.4cm}This is a very very very very very very very very very very very very\newline\hspace*{1.5cm}long part title}
\chapter{Chapter 1}
\section{Section 1.1}
\chapter{Chapter 2}
\section{Section 2.1}
\section{2.2}
\end{document}
这导致了结果
但是，可以采用更自动化的方式，而无需通过 \newline 和 \hspace* 手动完成所有操作。