动态改变章节编号和标题之间的空格

Question

我有一个文档，我通过创建自己的环境更改了章节和小节的格式

\newenvironment{Specification}{
    \renewcommand\thesubsection{SPEC\_\padzeroes[3]{\decimal{subsection}}}
    \renewcommand\thesubsubsection{SPEC\_\padzeroes[3]{\decimal{subsubsection}}}}{}

这可以正常工作，但现在目录中的章节编号和标题重叠

我可以通过使用包来更改数字和标题之间的空格tocloft，

\setlength\cftsubsecnumwidth{70pt}
\setlength\cftsubsubsecnumwidth{70pt}

但问题是，现在没有这种特殊格式的部分也有那么大的宽度，因此看起来很丑

有没有办法动态更改每个条目的数字宽度？也许在环境中？

下面是一个示例代码：

\documentclass[12pt,a4paper]{article}
\usepackage[latin1]{inputenc}
\usepackage{german,longtable}
\usepackage{multirow}
\usepackage{fmtcount}
\usepackage{tocloft}

\newenvironment{Specification}{% begin
    \renewcommand\thesubsection{SPEC\_\padzeroes[3]{\decimal{subsection}}}
    \renewcommand\thesubsubsection{SPEC\_\padzeroes[3]{\decimal{subsubsection}}}}
{% end
}

%\setlength\cftsubsubsecnumwidth{70pt} 
%\setlength\cftsubsecnumwidth{70pt}

\begin{document}

\tableofcontents

\section{System Requirements}
\subsection{Battery Characteristics}
\begin{Specification}
    \subsubsection{Battery pack configuration} 
    The BMS shall be able to operate on a battery
    \subsubsection{Pack voltage}
    The BMS shall be able to operate up to X V
\end{Specification}

\section{Mechanical Requirements}
\begin{Specification}
    \subsection{Maximum BMS Outline}
    The BMS shall not exceed the outline:\\
    \subsection{Maximum Height above PCB}
    The BMS shall not exceed the height
\end{Specification}

\end{document}

Answer 1

感谢 MWE。这是一个略微修改的版本，其中Specification环境对 ToC 的布局进行了本地更改并恢复了更改。

% tocspaceprob.tex  SE 638884

\documentclass[12pt,a4paper]{article}
\usepackage[latin1]{inputenc}
\usepackage{german,longtable}
\usepackage{multirow}
\usepackage{fmtcount}
\usepackage{tocloft}

%% PW added
\newlength{\shiftit}
\setlength{\shiftit}{50pt}

\newenvironment{Specification}{% begin
    \renewcommand\thesubsection{SPEC\_\padzeroes[3]{\decimal{subsection}}}
    \renewcommand\thesubsubsection{SPEC\_\padzeroes[3]{\decimal{subsubsection}}}
    %% PW added
 \addtocontents{toc}{\addtolength{\cftsubsubsecnumwidth}{\shiftit}}
 \addtocontents{toc}{\addtolength{\cftsubsecnumwidth}{\shiftit}}
}
{% end  %% PW added
 \addtocontents{toc}{\addtolength{\cftsubsubsecnumwidth}{-\shiftit}}
 \addtocontents{toc}{\addtolength{\cftsubsecnumwidth}{-\shiftit}}
}

%\setlength\cftsubsubsecnumwidth{70pt} 
%\setlength\cftsubsecnumwidth{70pt}

\begin{document}

\tableofcontents

\section{System Requirements}
\subsection{Battery Characteristics}
\begin{Specification}
    \subsubsection{Battery pack configuration} 
    The BMS shall be able to operate on a battery
    \subsubsection{Pack voltage}
    The BMS shall be able to operate up to X V
\end{Specification}

\section{Mechanical Requirements}
\begin{Specification}
    \subsection{Maximum BMS Outline}
    The BMS shall not exceed the outline:\\
    \subsection{Maximum Height above PCB}
    The BMS shall not exceed the height
\end{Specification}

\end{document}