lrbox / minipage / colorbox 內容中垂直間距巨集的奇怪解釋

Question

我知道我以前見過這個排版問題，但我找不到解決方案。乳膠可能非常違反直覺。我想做的就是建立一個 \panel{} 標頭類型宏，該宏在稍微修改的表中運作。 \panel 應增加與前一個表格的間距，並減少與下一個表格的間距。

我已經剝離了一個例子來說明這個問題。如何定義一個 \panel 巨集來完成預期的任務？

\documentclass{article}

\usepackage{color}
\usepackage{booktabs}

\newsavebox{\selvesteboxtwo}
\newenvironment{colboxfigtbl}
  {
   \begin{lrbox}{\selvesteboxtwo}%
   \begin{minipage}{\dimexpr\columnwidth-2\fboxsep-4em\relax}}
  {
   \end{minipage}\end{lrbox}%
   \begin{center}%
     \fcolorbox{blue}{yellow}{\usebox{\selvesteboxtwo}}%%real life do more
   \end{center} 
  }

\newenvironment{newtable}[1][]{%
  \begin{table}%
    \begin{center}%
      \begin{colboxfigtbl}
      }{%
      \end{colboxfigtbl}%
    \end{center}%
  \end{table}
}

\newcommand{\panel}[2]{%
  \par\bigskip%
  \begin{center} \textbf{Panel #1:} #2 \end{center}%
  \par\vspace*{-1.5\baselineskip}%
}

\begin{document}

\begin{newtable}

  \panel{A}{This is a bad panel}

  \begin{center}\begin{tabular}{l r} \toprule A & B \\ \bottomrule \end{tabular} \end{center}

  \panel{B}{This is a better panel}

  \begin{center}\begin{tabular}{l r} \toprule A & B \\  \bottomrule \end{tabular} \end{center}

  \panel{C}{This is a better panel}

  \begin{center}\begin{tabular}{l r} \toprule A & B \\  \bottomrule \end{tabular} \end{center}

\end{newtable}

\end{document}

Answer 1

通常，將環境嵌套在一起可能很棘手，因為環境往往會在其內容的上方和下方添加空間。最重要的是，某些環境試圖變得聰明並減去嵌套環境插入的額外空間。在像您這樣的情況下，答案很簡單：在\newtable已呼叫table環境的環境中，將巢狀\begin{center}...\end{center}環境替換為\centering...，這是一種無需環境即可實現相同效果的巨集形式。

\documentclass{article}

\usepackage{color}
\usepackage{booktabs}

\newsavebox{\selvesteboxtwo}
\newenvironment{colboxfigtbl}
  {
   \begin{lrbox}{\selvesteboxtwo}%
   \begin{minipage}{\dimexpr\columnwidth-2\fboxsep-4em\relax}}
  {
   \end{minipage}\end{lrbox}%
   \begin{center}%
     \fcolorbox{blue}{yellow}{\usebox{\selvesteboxtwo}}%%real life do more
   \end{center} 
  }

\newenvironment{newtable}[1][]{%
  \begin{table}%
    \centering%\begin{center}%
      \begin{colboxfigtbl}
      }{%
      \end{colboxfigtbl}%
%    \end{center}%
  \end{table}
}

\newcommand{\panel}[2]{%
  \par\bigskip%
  \begin{center} \textbf{Panel #1:} #2 \end{center}%
  \par\vspace*{-1.5\baselineskip}%
}

\begin{document}

\begin{newtable}

  \panel{A}{This is a bad panel}

  \begin{center}\begin{tabular}{l r} \toprule A & B \\ \bottomrule \end{tabular} \end{center}

  \panel{B}{This is a better panel}

  \begin{center}\begin{tabular}{l r} \toprule A & B \\  \bottomrule \end{tabular} \end{center}

  \panel{C}{This is a better panel}

  \begin{center}\begin{tabular}{l r} \toprule A & B \\  \bottomrule \end{tabular} \end{center}

\end{newtable}

\end{document}