使用 titletoc 处理部分（书籍类）

Question

我希望 \part 标题如图 1 所示，居中显示在两行，但我无法创建正确的代码，即使我在 titletoc 手册中没有找到针对 \part 的具体处理方法。

下面的代码

\documentclass{book}
\usepackage[T1]{fontenc}
\usepackage[english]{babel}
\usepackage{titletoc}

\titlecontents{part}
[0em]
{\addvspace{1.5pc}\filcenter}
{\thecontentslabel* \huge}
{\huge}
{} % without page number
[\addvspace{.5pc}]

\begin{document}
\tableofcontents
\part{Something as a title}
\end{document}

没有产生我想要的结果。但我不确定 titletoc 句柄是否完全\part...谢谢！

Answer 1

booktitletoc与原样不兼容。使用补丁此处提出您可以轻松地让它工作：

\documentclass{book}
\usepackage[T1]{fontenc}
\usepackage[english]{babel}
\usepackage{titletoc}

% book -- titletoc patch: https://tex.stackexchange.com/a/454553/134574
\usepackage{etoolbox}
\makeatletter
\patchcmd\@part
  {\thepart}
  {\protect\numberline{\thepart}}
  {}{\FAIL}
\makeatother

\titlecontents{part}
  [0em]
  {\addvspace{1.5pc}\filcenter}
  {\large\partname~\thecontentslabel\endgraf\bfseries}
  {\large}
  {} % without page number
  [\addvspace{.5pc}]

\begin{document}
\tableofcontents
\part{Something as a title}
\end{document}

Answer 2

像这样？

\documentclass{book}
\usepackage[newparttoc]{titlesec}
\usepackage{titletoc} %

\titleformat{\part}[display]
  {\Huge\scshape\filright\centering}
  {}
  {20pt}
  {\thispagestyle{empty}}    
 \titlecontents{part}[0pt]{\addvspace{2pc}\centering\large}{\parbox[t][3ex][t]{\linewidth}{\centering\partname~\thecontentslabel} \bfseries}{}{}[\medskip]%

\begin{document}

\tableofcontents

\part{This is a part of a document}

\chapter{Chapter Title}

\end{document}