在固定宽度的颜色框中居中文本

Question

我怎样才能将此文本水平对齐到框的中心？

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---

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\documentclass[margin=0mm,border=0]{standalone}
\usepackage{tikz}
\setlength{\tabcolsep}{0pt}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{document}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{tabular}{c}
    \colorbox{red}{\parbox{4em}\hfill\textcolor{white}{``hello, world''}}
\end{tabular}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\end{document}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

Answer 1

\parbox接受第二个强制参数，即框的内容。在您的代码中，这是\hfill。因此，有一个宽度为 4em 的空 parbox，后面跟着文本。为了显示此效果，我\parbox{4em}\hfill用一条规则替换了\rule{4em}{1em}：

\documentclass[margin=0mm]{standalone}
\usepackage{xcolor}
\setlength{\tabcolsep}{0pt}

\begin{document}
\begin{tabular}{c}
  \colorbox{red}{\parbox{4em}\hfill\textcolor{white}{``hello, world''}}\\
  \colorbox{red}{\rule{4em}{1em}\textcolor{white}{``hello, world''}}
\end{tabular}
\end{document}

要将文本置于宽度为 4cm 的 parbox 中央，您可以使用：

\documentclass[margin=0mm]{standalone}
\usepackage{xcolor}
\begin{document}
\colorbox{red}{\parbox{4em}{\centering\textcolor{white}{``hello, world''}}}
\end{document}

Answer 2

不确定你为什么要这样做，但使用 很容易\makebox，默认情况下会将其内容居中。我增加了框的大小，以便它包含文本：

\documentclass[margin=0mm,border=0]{standalone}
\usepackage{tikz}
\setlength{\tabcolsep}{0pt}

\begin{document}

\begin{tabular}{c}
    \colorbox{red}{\makebox[6em]{\textcolor{white}{``hello, world''}}}
\end{tabular}

\end{document}