在每页的外侧画出出血边距

Question

我正在写一份双页文档。

我想在外部的每页之后的某页。

我知道如何在页面左侧或页面右侧添加出血区域，但我不知道如何在每页的外部添加它。

我怎样才能做到这一点？

这是一个 MWE。

\documentclass[doublepage]{book}

\usepackage{everypage}
\usepackage{tikz}

\def\exteriorBleeding{   
\begin{tikzpicture}[remember picture,overlay]
  \fill[blue] ([xshift=-2cm]current page.north east) rectangle (current page.south east);
\end{tikzpicture}}

\begin{document}

This is the first page.
\newpage
\AddEverypageHook{\exteriorBleeding}
On even pages, the bleeding margin should be on the left.
\newpage
On odd pages, the bleeding margin should be on the right.
\newpage

\end{document}

Answer 1

灵感来自这个答案，这里有一个解决方案。

\documentclass[doublepage]{book}

\usepackage{everypage}
\usepackage{tikz}
\usepackage{changepage}


\def\exteriorBleeding{
\checkoddpage
\ifoddpage 
{%
\begin{tikzpicture}[remember picture,overlay]
  \fill[blue] ([xshift=2cm]current page.north west) rectangle (current page.south west);
\end{tikzpicture}
}
\else 
{%
\begin{tikzpicture}[remember picture,overlay]
  \fill[blue] ([xshift=-2cm]current page.north east) rectangle (current page.south east);
\end{tikzpicture}
}
\fi} 


\begin{document}

This is the first page.
\newpage
\AddEverypageHook{\exteriorBleeding}
On even pages, the bleeding margin should be on the left.
\newpage
On odd pages, the bleeding margin should be on the right.
\newpage

\end{document}