如何存储和恢复当前字体大小？

Question

针对此例：新环境中没有括号的新命令，我必须将当前字体大小传递给环境，但我更喜欢它自己采用它？

为了清楚起见，我想存储selectfont参数并在以后重复使用它们。

有一个明显的括号解决方案，但是相关问题的 OP 不想使用括号。

\documentclass{article}
\pagestyle{empty}

\begin{document}

\begin{itemize}

\item Bla

\item{\small Small is small} 

\item Bla is not small, but the OP of the related question doesn't want to use brackets.

\end{itemize}

\end{document}

然后，我尝试在\item宏内创建一个切换系统，为此我必须知道字体大小参数是什么，以便存储和恢复它们。

\documentclass{article}
\pagestyle{empty}
\usepackage{paralist,xparse}

\newcommand{\Com}[1][\hspace{1cm}]{\item[#1\aftergroup\footnotesize]}

\NewDocumentEnvironment{Itemize}
    {O{}    % item caracter ex $\bullet$
    D<>{\normalsize}}{%
    \begin{list}{#2#1\aftergroup#2}{%
        \setlength{\labelwidth}{0em} % adapt as you want
        \setlength{\leftmargin}{0pt}
        \setlength{\itemindent}{5pt}%
    }}{%
    \end{list}}


\begin{document}

\large

\begin{Itemize}[$\bullet$]<\large>
\item One
\item Two
\Com This is my comment
\item Three
\Com This is my comment
\end{Itemize}

Back to current font size !

\end{document}

Answer 1

\documentclass{article}
\usepackage{lipsum}
\usepackage{pgf}
\usepackage{pgffor}


%This is my suggestion (with @Circumscribe's comment in account):

\makeatletter
\newcommand{\savefont}{\xdef\oldfontsize{\f@size}\xdef\oldblskip{\f@baselineskip}}
\newcommand{\backtoppevfont}{\fontsize{\oldfontsize}{\oldblskip}\selectfont}
\makeatother


%Just added to demonstrate "unknown" font
\def\randomSize{%
\pgfmathsetmacro{\a}{random(1,4)}%
\foreach \fnt[count=\i from 1] in {\tiny,\footnotesize,\large,\Large}{%
\ifnum \a=\i\global\let\fs\fnt\breakforeach
\fi}\expandafter\string\fs\fs%
}
\begin{document}


Here is a text... and a random change of font to:\randomSize'' Test! RFont \savefont

That turned into \small\verb|\small| here and restored to \backtoppevfont RFont1!

\end{document}

输出：

Answer 2

保存当前字体并添加一些代码，\item以便在发出所需的代码后恢复字体\par。

\documentclass{article}
\usepackage{etoolbox}

\usepackage[nopar]{lipsum} % mock text

\newif\ifcomment
\newcommand{\Com}{\par\footnotesize\itshape\commenttrue}

\newenvironment{Itemize}
 {%
  \edef\Itemizecurrent{\the\font}%
  \itemize
  \preto{\item}{\ifcomment\par\Itemizecurrent\fi}%
 }{%
   \enditemize
 }


\begin{document}

\begin{Itemize}
\item One
\item \lipsum[4]
\Com \lipsum[5]
\item Three
\Com This is my comment
\end{Itemize}

Back to current font size!

\end{document}