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命令在环境生效之前

tag-icon • tag-icon macros longtable
命令在环境生效之前

是否可以\vspace{-\baselineskip}在环境启动之前添加一个内部，例如 longtable （或其他环境} 以使其生效？MWE 没有效果。

\documentclass{article}
\usepackage{longtable}
\usepackage{blindtext}

\begin{document}

\blindtext

\begin{longtable}{ll}
\vspace{-\baselineskip} \\ % this has no effect
                           % why \\ are really needed since caption has them?
\caption{testing table} \\
\hline
aaaa & bbbb \\
cccc & dddd \\
\hline
\end{longtable}

\end{document}

存在 MWE 在 LOT 中引用混乱的问题。

\documentclass[captions=tableheading]{scrartcl}

\usepackage{blindtext}

\usepackage{hyperref}
\usepackage{tabu,longtable}
%\usepackage{threeparttable} % the package below already loads it
\usepackage[referable]{threeparttablex}
\usepackage{booktabs}
\usepackage{caption}


\usepackage{etoolbox}
\makeatletter
\chardef\TPT@@@asteriskcatcode=\catcode`*
\catcode`*=11
\expandafter\patchcmd\csname\string\threeparttable\endcsname
    {\TPT@hookin{tabular}}
    {\TPT@hookin{tabular}\TPT@hookin{tabu}} % allow threeparttable with tabu
    {}{}
\catcode`*=\TPT@@@asteriskcatcode
\makeatother

\makeatletter % fix referencing of LOT while using longtabu
    \newcounter{dummy}
    \newcommand{\setdummy}{\refstepcounter{dummy} \\}
    \let\oldlongtabu\longtabu\def\dummytabu{\vspace{-\baselineskip}\oldlongtabu} % correct the \\ in \setdummy
    \def\enddummytabu{\endlongtabu}
    \def\dummycap{\setdummy\caption}
\makeatother



\begin{document}

\listoftables

\bigskip

\blindtext

% LOT reference does not work
\begin{ThreePartTable}
\begin{TableNotes}
\footnotesize
\item[a] \label{tn:aa} A note
\item[b] Another note
\end{TableNotes}
\begin{longtabu}{ll}
\caption{A long table 1}
\label{tab:test1} \\
\toprule
Column 1 & Column 2 \\
\midrule
\endfirsthead
\toprule
Column 1 & Column 2 \\
\midrule
\endhead
\cmidrule{2-2}
\multicolumn{2}{r}{\textit{continued}}
\endfoot
\bottomrule
\insertTableNotes
\endlastfoot
% the contents of the table
A& B\tnotex{tn:aa} \\
\midrule
%\newpage % just testing page break
C\tnote{b} & D \\
\end{longtabu}
\end{ThreePartTable}

\blindtext

% LOT reference works fine
\begin{ThreePartTable}
\begin{TableNotes}
\footnotesize
\item[a] \label{tn:bb} A note
\item[b] Another note
\end{TableNotes}
\begin{longtable}{ll}
\caption{A long table 2}
\label{tab:test2} \\
\toprule
Column 1 & Column 2 \\
\midrule
\endfirsthead
\toprule
Column 1 & Column 2 \\
\midrule
\endhead
\cmidrule{2-2}
\multicolumn{2}{r}{\textit{continued}}
\endfoot
\bottomrule
\insertTableNotes
\endlastfoot
% the contents of the table
A& B\tnotex{tn:bb} \\
\midrule
%\newpage % just testing page break
C\tnote{b} & D \\
\end{longtable}
\end{ThreePartTable}

\blindtext

% LOT reference works fine (with vskip correction)
\begin{ThreePartTable}
\begin{TableNotes}
\footnotesize
\item[a] \label{tn:cc} A note
\item[b] Another note
\end{TableNotes}
\begin{dummytabu}{ll}
\dummycap{A long table 3}
\label{tab:test3} \\
\toprule
Column 1 & Column 2 \\
\midrule
\endfirsthead
\toprule
Column 1 & Column 2 \\
\midrule
\endhead
\cmidrule{2-2}
\multicolumn{2}{r}{\textit{continued}}
\endfoot
\bottomrule
\insertTableNotes
\endlastfoot
% the contents of the table
A& B\tnotex{tn:cc} \\
\midrule
%\newpage % just testing page break
C\tnote{b} & D \\
\end{dummytabu}
\end{ThreePartTable}

\blindtext

\end{document}

答案1

只需使用

\begin{ThreePartTable}
\begin{TableNotes}
\footnotesize
\item[a] \label{tn:aa} A note
\item[b] Another note
\end{TableNotes}
\begin{longtabu}{ll}
\noalign{\phantomsection}
\caption{A long table 1}
\label{tab:test1} \\
\toprule
...

链接似乎有效，并且没有添加额外的空间。

答案2

longtable\LTpre在表格前插入长度为（默认为）的 vskip \bigskipammount，因此要更改表格前的垂直空间，请使用\setlength或更改此长度\addtolength。使用\vspace您显示的位置将其放在第一行的第一个单元格中，这是一个l条目，因此水平框中的垂直跳过不起作用。所以效果只是添加尽管名义上指定了负跳过，但表格前却有一个空白行。

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