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创建一个不可见的 vbox

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创建一个不可见的 vbox

我将 PDF 元信息放在\vbox纯 XeTeX 文档中，我希望它表现得好像根本没有框一样（因此会出现\vskip后面的任何附加内容\vbox）。现在，我正在使用以下内容：

\nointerlineskip\vbox to 0pt { … }\nointerlineskip

我\nointerlineskip{\offinterlineskip\vbox …}也尝试过，但是之后却留下了空白，尽管本来不应该跳过。

我怎样才能使这个垂直框在任何情况下都无缝？

答案1

我认为正确的做法是

\edef\theprevdepth{\the\prevdepth}\nointerlineskip
\vbox to 0pt{...}\prevdepth=\theprevdepth

例子

\def\metabox#1{\edef\theprevdepth{\the\prevdepth}\nointerlineskip
  \vbox to0pt{#1\vss}\prevdepth=\theprevdepth}

\leavevmode\vbox{\hsize=.3\hsize
  some text some text some text some text 
  some text some text some text some text 

  \metabox{META INFO}

  some text some text some text some text 
  some text some text some text some text }%
\quad
\vbox{\hsize=.3\hsize
  some text some text some text some text
  some text some text some text some text

  some text some text some text some text
  some text some text some text some text }

\vskip2cm

\hrule

\leavevmode\vbox{\hsize=.3\hsize
  \metabox{META INFO}

  some text some text some text some text 
  some text some text some text some text }%
\quad
\vbox{\hsize=.3\hsize
  some text some text some text some text
  some text some text some text some text }

\vskip1cm
\hrule
\leavevmode\vbox{\hsize=.3\hsize
  some text some text some text some text
  some text some text some text some text }

\bye

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