奇数页和偶数页平行段落

Question

以下 MWE 使每个\heading{标签}{标题}清除跨页，这解决了第一个问题。页眉的设置方法是使用\markboth{标题}{标题}，我没有对原始 MWE 进行任何更改，但是现在它\heading总是开始一个新页面，页眉不会因为\heading在同一个双页跨页上有多个而混淆，所以希望这可以解决您的第二个问题。

\documentclass[12pt]{scrbook}
\usepackage{flowfram}
\usepackage{lipsum}
\usepackage{etoolbox}

% set up frames

\newflowframe{\textwidth}{\textheight}{0pt}{0pt}[main]

\newdynamicframe[odd]{\textwidth}{\textheight}{0pt}{0pt}[details]
\newdynamicframe[even]{\textwidth}{\textheight}{0pt}{0pt}[annote]

% \checkisroom{idl}{text}
\makeatletter
\providecommand{\@gobblethree}[3]{}
\newsavebox\tmpsbox
\newif\ifenoughroom
\newcommand{\checkisroom}[2]{%
  \bgroup
    % get the frame's idn (stored in \ff@id)
    \@dynamicframeid{#1}%
    % temporarily suspend writing to external files
    \let\protected@write\@gobblethree
    % put the frame's contents and the pending text into 
    % the temporary sbox
    \begin{lrbox}{\tmpsbox}%
    \begin{minipage}{\textwidth}%
     \csname @dynamicframe@\romannumeral\ff@id\endcsname
     \par
     #2%
    \end{minipage}
    \end{lrbox}%
    % Does it fit the page?
    \settoheight{\@ff@tmp@y}{\usebox\tmpsbox}%
    \settodepth{\dimen@ii}{\usebox\tmpsbox}%
    \addtolength{\@ff@tmp@y}{\dimen@ii}%
    \ifdim\@ff@tmp@y>\textheight
       \global\enoughroomfalse
    \else
       \global\enoughroomtrue
    \fi
  \egroup
}

% \getcontentsheight{length}{text}
\newcommand{\getcontentsheight}[2]{%
 \bgroup
    \let\protected@write\@gobblethree
    \begin{lrbox}{\tmpsbox}%
      \begin{minipage}{\textwidth}%
       #2%
      \end{minipage}%
    \end{lrbox}%
    \settoheight{\@ff@tmp@y}{\usebox\tmpsbox}%
    \settodepth{\dimen@ii}{\usebox\tmpsbox}%
    \addtolength{\@ff@tmp@y}{\dimen@ii}%
    \global#1=\@ff@tmp@y\relax
 \egroup
}

\newcounter{heading}

% \heading{label}{title}
\newcommand{\heading}[2]{%
  \cleartoeven
  \setdynamiccontents*{annote}{}%
  \setdynamiccontents*{details}{}%
  \refstepcounter{heading}%
  \label{#1}%
  \markboth{#2}{#2}%
  \annote
    {%
      \section*{\ref{#1}. #2}%
    }%
    {%
      \section*{\ref{#1}. #2}%
      \addcontentsline{toc}{section}{#2}%
      \par\strut
    }%
  \afterheadingtrue
}

\newif\ifafterheading

\newlength\blockheight

\newcommand{\blocksep}{\par\vspace{2ex}}

% \annote{annotation}{text}
\newcommand{\annote}[2]{%
  \getcontentsheight{\blockheight}{#1}%
  \def\largerblock{#1}%
  \getcontentsheight{\@ff@tmp@y}{#2}%
  \ifdim\blockheight<\@ff@tmp@y
    \blockheight=\@ff@tmp@y\relax
    \def\largerblock{#2}%
  \fi
  \ifafterheading
    \edef\startblock{%
      \noexpand\blocksep
      \noexpand\begin{minipage}[t][\the\blockheight]{\the\textwidth}%
      \noexpand\setlength{\noexpand\parindent}{\the\parindent}%
      \noexpand\par\noexpand\noindent
    }%
    \afterheadingfalse
  \else
    \edef\startblock{%
      \noexpand\begin{minipage}[t][\the\blockheight]{\the\textwidth}%
      \noexpand\setlength{\noexpand\parindent}{\the\parindent}%
      \noexpand\par\noexpand\indent
    }%
  \fi
  \checkisroom{details}{\largerblock}%
  \ifenoughroom
    \@dynamicframeid{annote}%
    \expandafter\appenddynamiccontents\expandafter\ff@id
     \expandafter{%
       \expandafter\blocksep
       \startblock
       #1%
       \end{minipage}}%
    \@dynamicframeid{details}%
    \expandafter\appenddynamiccontents\expandafter\ff@id
     \expandafter{%
       \expandafter\blocksep
        \startblock
         #2%
         \end{minipage}}%
  \else
    % output 2 pages
    \cleartoeven
    \@dynamicframeid{annote}%
    \expandafter\setdynamiccontents\expandafter\ff@id
     \expandafter{\startblock#1\end{minipage}}%
    \@dynamicframeid{details}%
    \expandafter\setdynamiccontents\expandafter\ff@id
     \expandafter{\startblock#2\end{minipage}}%
  \fi
}
\makeatother

\newcommand{\cleartoeven}{%
  \ifthispageodd % KOMA command
  {\newpage}%
  {\mbox{}\newpage\mbox{}\newpage}%
}

\AtEndDocument{\cleartoeven}

\title{Sample Document}
\author{A.N. Other}

\begin{document}
\maketitle

\tableofcontents

\heading{sample}{Sample Heading}

\annote
 {Annotation on the left}
 {A longer paragraph on the right matching the annotation on the
  left.

  \lipsum[1]
 }

\heading{sample2}{Another Sample Heading}

\annote
 {\lipsum[2]}
 {\lipsum[3]}

\annote
 {Another annotation.}
 {\lipsum[4]}

\annote
 {\lipsum[5-6]}
 {\lipsum[7]}

\end{document}

第一个跨页（第 4 页和第 5 页）：

第 4 页和第 5 页的图片

第二个跨页（第 6 页和第 7 页）：

第 6 页和第 7 页的图片

Answer 1