当我尝试将“\intertext或”设置\shortintertext为条件时，我会在条件文本之前获得多余的垂直间距，如下面的 MWE 所示。请注意“艾伯特坚持认为”和“但我们知道”。
右侧minipage代表正确的间距，因为它没有\ConditionalText{}应用宏。
但是，当通过 禁用条件时，\toggletrue{}文本将被抑制并且间距正常：
笔记：
似乎
\NewDocumentCommand{\ConditionalText}{O{red} +m}{#2}%\iftoggle间距问题仍然存在。但是，如果我直接在环境中使用，问题就会得到解决align：\newcommand{\TextWithConditional}{% \hfill\textbf{Intertext with Conditionals}\hfill% Newton said: \begin{align*} F &= ma \\ \iftoggle{SupressConditionalText}{}{\intertext{Albert insisted that}} E &=mc^2 \\ \iftoggle{SupressConditionalText}{}{\shortintertext{but we know}} E &=\frac{1}{2}mv^2 \end{align*} Text after a conditional display math formula.% }%
失败的解决方案：
好吧，我找到了一个我认为非常出色的解决办法，但似乎我所能做的就是引用爱迪生的话：“我发现了一个方法，不是工作”。但不确定为什么它不起作用。
\NewDocumentCommand{\ConditionalText}{O{red} +m}{% \ignorespaces% \iftoggle{SupressConditionalText}{}{% \ifmmode% \let\OldIntertext\intertext% \let\OldShortIntertext\shortintertext% \def\intertext{\vspace*{\baselineskip}\OldIntertext}% \def\shortintertext{\vspace*{-\baselineskip}\OldShortIntertext}% #2% Don't underline if in math mode \else% %\UnderlineText[#1]{#2}% This case not used in this MWE. \fi% }% \ignorespacesafterend% }%
代码：
\documentclass{article}
\usepackage{xparse}% Not essential for this problem.
\usepackage{xcolor}
\usepackage{etoolbox}
\usepackage{mathtools}
\usepackage{soul}
\usepackage{parskip}% Eliminate need for \noindent
%\usepackage{showframe}
\newtoggle{SupressConditionalText}%
\togglefalse{SupressConditionalText}% This has too much space BEFORE the conditional \intertext.
\NewDocumentCommand{\UnderlineText}{O{red} +m}{%
\setulcolor{#1}\ul{#2}%
}%
\NewDocumentCommand{\ConditionalText}{O{red} +m}{%
\ignorespaces%
\iftoggle{SupressConditionalText}{}{%
\ifmmode%
#2% Don't underline if in math mode
\else%
\UnderlineText[#1]{#2}%
\fi%
}%
\ignorespacesafterend%
}%
\newcommand{\TextWithConditional}{%
\hfill\textbf{Intertext with Conditionals}\hfill%
Newton \ConditionalText{often} said:
\begin{align*}
F &= ma \\
\intertext{Albert \ConditionalText{awkwardly} insisted that}
E &=mc^2 \\
\ConditionalText{\shortintertext{but we know}}
E &=\frac{1}{2}mv^2 \\
\ConditionalText{\intertext{But, equating the two we obtain.}}
mc^2 &= \frac{1}{2}mv^2
\shortintertext{from which \ConditionalText{we obtain}}
v &= \sqrt{2}c
\end{align*}
Text after a conditional display math formula.%
}%
\newcommand{\TextWithoutConditional}{%
\hfill\textbf{Intertext without Conditionals}\hfill%
Newton said:
\begin{align*}
F &= ma \\
\intertext{Albert awkwardly insisted that}
E &=mc^2 \\
\shortintertext{but we know}
E &=\frac{1}{2}mv^2
\end{align*}
Text after a conditional display math formula.%
}%
\newcommand{\TextWithoutConditionalWithoutInterText}{%
\hfill\textbf{No Intertext, No Conditionals}\hfill%
Newton said:
\begin{align*}
F &= ma \\
E &=mc^2 \\
E &=\frac{1}{2}mv^2
\end{align*}
Text after a conditional display math formula.%
}%
\begin{document}
\begin{minipage}[t]{0.45\linewidth}
\TextWithConditional
\end{minipage}
\hfill\vrule\hfill%
\begin{minipage}[t]{0.45\linewidth}
\TextWithoutConditional
\end{minipage}
\bigskip\hrule
\toggletrue{SupressConditionalText}% Disable conditional text
%
With conditional text supressed, things work fine:
\begin{minipage}[t]{0.45\linewidth}
\TextWithConditional
\end{minipage}%
\hfill\vrule\hfill%
\begin{minipage}[t]{0.45\linewidth}
\TextWithoutConditionalWithoutInterText
\end{minipage}%
\end{document}
答案1
我认为这会满足您的要求，并使测试具有可扩展性，如果您处于align*或ifmmode为真，它将采用数学分支。它需要扩展到其他环境。
\documentclass{article}
\usepackage{xparse}% Not essential for this problem.
%\usepackage{xcolor}
\usepackage{etoolbox}
\usepackage{mathtools}
%\usepackage{soul}
\usepackage{parskip}% Eliminate need for \noindent
%\usepackage{showframe}
\makeatletter
\newtoggle{SupressConditionalText}%
\togglefalse{SupressConditionalText}% This has too much space BEFORE the conditional \intertext.
% Not used in this paritcular example
\NewDocumentCommand{\UnderlineText}{O{red} +m}{%
\setulcolor{#1}\ul{#2}%
}%
\def\xaligns{align*}
\def\ConditionalText#1{%
\iftoggle{SupressConditionalText}{}{%
\ifx\@currenvir\xaligns
#1%
\else\ifmmode
#1% Don't underline if in math mode
\else%
\UnderlineText[red]{#1}% This case not used in this MWE.
\fi
\fi
}%
\ignorespacesafterend%
}%
\newcommand{\TextWithConditional}{%
\hfill\textbf{Intertext with Conditionals}\hfill%
Newton said:
\begin{align*}
F &= ma \\
\ConditionalText{\intertext{Albert insisted that}}
E &=mc^2 \\
\ConditionalText{\shortintertext{but we know}}
E &=\frac{1}{2}mv^2
\end{align*}
Text after a conditional display math formula.%
}%
\newcommand{\TextWithoutConditional}{%
\hfill\textbf{Intertext without Conditionals}\hfill%
Newton said:
\begin{align*}
F &= ma \\
\intertext{Albert insisted that}
E &=mc^2 \\
\shortintertext{but we know}
E &=\frac{1}{2}mv^2
\end{align*}
Text after a conditional display math formula.%
}%
\newcommand{\TextWithoutConditionalWithoutInterText}{%
\hfill\textbf{No Intertext, No Conditionals}\hfill%
Newton said:
\begin{align*}
F &= ma \\
E &=mc^2 \\
E &=\frac{1}{2}mv^2
\end{align*}
Text after a conditional display math formula.%
}%
\begin{document}
\begin{minipage}[t]{0.45\linewidth}
\TextWithConditional
\end{minipage}
\hfill\vrule\hfill%
\begin{minipage}[t]{0.45\linewidth}
\TextWithoutConditional
\end{minipage}
\bigskip\hrule
\toggletrue{SupressConditionalText}% Disable conditional text
%
With conditional text supressed, things work fine:
\begin{minipage}[t]{0.45\linewidth}
\TextWithConditional
\end{minipage}%
\hfill\vrule\hfill%
\begin{minipage}[t]{0.45\linewidth}
\TextWithoutConditionalWithoutInterText
\end{minipage}%
\end{document}