% !TeX root = tcolorbox.tex
% include file of tcolorbox.tex (manual of the LaTeX package tcolorbox)
\clearpage
\section{Library \mylib{magazine}}\label{sec:magazine}%
\tcbset{external/prefix=external/magazine_}%
\newboxarray{myarticle}

\begin{tcolorbox}[
  enhanced jigsaw,
  size=small,width=6cm,
  title=Example Article,
  fonttitle=\bfseries,center title,
  fontupper=\small,
  %height fixed for=first and middle,
  watermark text=\arabic{tcbbreakpart},
  breakable,
  break at=8.5\baselineskip/9\baselineskip,
  reset and store to box array=myarticle,
  colframe=green!50!black,
  colback=green!10,
  pad at break=5mm,
  ]
This is an example for an article which starts right here and
is continued to the following pages.
The body text for the article is written inside a single
|tcolorbox|. This box is split into parts using the tools from
this section, namely \refKey{/tcb/reset and store to box array}
with a new box array |myarticle| which was created by
|\newboxarray{myarticle}|.

The resulting parts are distributed throughout this
\zvref[S]{sec:magazine} using \refCom{consumetcboxarray}
at the appropriate places you see.
The linking texts like \emph{continued on page x} are created
by \refKey{/tcb/finish} commands for the embedding \refCom{tcbox}.
To label the box parts, \refKey{/tcb/phantomlabel} is used.

These quite small partial boxes are for demonstration purposes.
With the tools of this section, a magazine type document could be
created, but this still needs a lot of manual control.
\end{tcolorbox}

\newtcolorbox{articleside}[1][]{blanker,sidebyside,sidebyside gap=5mm,sidebyside align=top seam,
  parbox=false,righthand width=6cm,
  goto/.style={finish={\node[above=-2pt,color=green!50!black] at (frame.south)
    {\slshape\scriptsize --- continued on page~\hypersetup{linkcolor=green!50!black}\pageref{myarticle-##1}\ \textcolor{green!50!black}{---}};}},
  from/.style={finish={\node[below=-1pt,color=green!50!black] at (frame.north)
    {\slshape\scriptsize --- continued from page~\hypersetup{linkcolor=green!50!black}\pageref{myarticle-##1}\ \textcolor{green!50!black}{---}};}},
  #1}

\begin{articleside}[after skip=6pt]
The main purpose of this library is to store a |tcolorbox| into an array
of box registers for later usage.

If the |tcolorbox| is not breakable, there is not much add-on
compared to usual \TeX/\LaTeX\ box storage and usage (and you do not really need this
library for that use case).
For a breakable |tcolorbox|, this library allows to capture all partial boxes
into a sequence of registers. The partial boxes can be used anywhere in
arbitrary order.
\tcblower\consumetcboxarray[myarticle]{1}{blanker,nobeforeafter,phantomlabel=myarticle-one,goto=two}
\end{articleside}

The name of this library indicates \emph{magazine} in the sense of storage,
but also in the sense of a journal where an article often is \emph{continued on page x}.
An example for this kind of application is given throughout this section starting
on the right hand side. The creation of this library was motivated by
Ulrike Fischer and Steven B.~Segletes.

The library is loaded by a package option or inside the preamble by:
\begin{dispListing}
  \tcbuselibrary{magazine}
\end{dispListing}
This also loads the library \mylib{breakable}, see \zvref[S]{sec:breakable}.

\begin{marker}
The box register operations of this library are global. \TeX\ grouping will
not clear the registers when leaving the current group. Also be aware that
extensive use of large box arrays may eat up \TeX's available memory and
registers.
\end{marker}

\subsection{Creation and Resetting of Box Arrays}\label{subsec:magazine_creation}

\begin{docCommand}[doc new=2015-07-13]{newboxarray}{\marg{name}}
  This creates a new box array called \meta{name}. There already is a
  box array available with name |default| which can be used directly.
  Note that the creation is a global operation.
\begin{dispListing}
\newboxarray{myarray}
\end{dispListing}
\end{docCommand}


\begin{docCommand}[doc new=2015-07-13]{boxarrayreset}{\oarg{name}}
  Resets the size counter of a box array \meta{name} to zero.
  If \meta{name} is not provided, |default| is used as name.
  Use this or \refKey{/tcb/reset box array} before
  you apply \refKey{/tcb/store to box array}. Otherwise, all boxes would
  be appended to the already existing boxes.
  This command does not clear box registers.
\begin{dispListing}
\boxarrayreset            % resets `default'
\boxarrayreset{myarray}   % resets `myarray'
\end{dispListing}
\end{docCommand}

\enlargethispage*{20mm}

\begin{docTcbKey}[][doc new=2015-07-13]{reset box array}{\colOpt{=\meta{name}}}{default |default|, initially unset}
  Resets the size counter of a box array \meta{name} to zero.
  Use this or \refCom{boxarrayreset} (which does the same) before
  you apply \refKey{/tcb/store to box array}.
\begin{dispListing}
\tcbset{
  reset box array,         % resets `default'
  reset box array=myarray, % resets `myarray'
}
\end{dispListing}
\end{docTcbKey}

\clearpage
\begin{docCommand}[doc new=2015-07-13]{boxarrayclear}{\oarg{name}}
  Works like \refCom{boxarrayreset} to reset the size counter of a
  box array \meta{name} to zero. Additionally, all allocated box registers
  of the box array are cleared of their content.
  Note that the allocated box registers stay allocated. So, this may be
  useful to clear memory, but not to free registers for other applications.
  If \refCom{consumeboxarray} or \refCom{consumetcboxarray} was used to
  apply the stored boxes, there is no advantage in using \refCom{boxarrayclear}.
\begin{dispListing}
\boxarrayclear            % clears `default'
\boxarrayclear{myarray}   % clears `myarray'
\end{dispListing}
\end{docCommand}



\subsection{Storing Content}\label{subsec:magazine_storing}

\begin{docTcbKey}[][doc new=2015-07-13]{store to box array}{\colOpt{=\meta{name}}}{default |default|, initially unset}
Stores a |tcolorbox| or all parts of a break sequence of a |tcolorbox| into
a box array \meta{name}. If no \meta{name} is given, the already existing |default|
box array is used. Otherwise, the box array has to be created beforehand
with \refCom{newboxarray}. Note that the box has to be \refKey{/tcb/breakable},
if the box shall break into several parts.
Typically, manual break points are additionally defined by \refKey{/tcb/break at}.
Otherwise, the box parts will have a length of about |\textheight|.
For most use cases, a \refKey{/tcb/reset box array} should be applied
to reset the box array counter.\enlargethispage*{2cm}

\begin{exdispExample}{storetoboxarray_1}
% \usepackage{lipsum}
\begin{tcolorbox}[enhanced jigsaw,size=fbox,width=4cm,
  colback=yellow!10,colframe=yellow!10!black,
  enforce breakable,% use only breakable in the real world!
  break at=7cm/4cm,
  height fixed for=all,
  watermark text=\arabic{tcbbreakpart},
  reset box array,
  store to box array
  ]
\lipsum[1]
\end{tcolorbox}

\useboxarray{1}\hfill
\begin{tabular}[b]{cc}
\multicolumn{2}{c}{\includegraphics[width=7cm]{Basilica_5.png}}\\
\useboxarray{2} & \useboxarray{3}
\end{tabular}
\end{exdispExample}

\clearpage
If the first box part should fill the rest of the available space of
the current page, you can use |\pagegoal-\pagetotal| minus some distance for
the first element of \refKey{/tcb/break at}. You may want to have some
additional distance to the preceding text.

\begin{dispListing}
% \usepackage{lipsum}
\begin{tcolorbox}[enhanced,breakable,
  reset box array,
  store to box array,
  break at=\pagegoal-\pagetotal-5mm/0pt,
  height fixed for=first and middle]
\lipsum[1-15]
\end{tcolorbox}%
%
\consumetcboxarray{1}{blanker,before=\par\vfill\noindent}
\end{dispListing}


\begin{exdispExample}{storetoboxarray_2}
\begin{tcolorbox}[blanker,width=4cm,
  fontupper=\footnotesize,
  enforce breakable,% use only breakable in the real world!
  break at=4cm,
  height fixed for=all,
  watermark text=\arabic{tcbbreakpart},
  reset box array,
  store to box array
  ]
\includegraphics[width=\linewidth]{Basilica_5.png}\par
\lipsum[1-2]
\end{tcolorbox}

\begin{tcbitemize}[raster columns=3,raster equal height,
  size=small,halign=center,sharp corners,colback=blue!5]
\tcbitem\consumeboxarray{5}
\tcbitem\consumeboxarray{6}
\tcbitem\consumeboxarray{1}
\tcbitem\consumeboxarray{2}
\tcbitem\consumeboxarray{3}
\tcbitem\consumeboxarray{4}
\end{tcbitemize}
\end{exdispExample}
\end{docTcbKey}


\begin{docTcbKey}[][doc new=2015-07-13]{reset and store to box array}{\colOpt{=\meta{name}}}{style, default |default|, initially unset}
  Combination of \refKey{/tcb/reset box array} and \refKey{/tcb/store to box array}.
\end{docTcbKey}



\begin{docTcbKey}[][doc new=2015-07-13]{do not store to box array}{}{style, no default, initially set}
Disables the \refKey{/tcb/store to box array} option, if set before.
\end{docTcbKey}


\begin{docEnvironment}[doc new=2015-07-13]{boxarraystore}{\marg{name}}
  Stores the environment content into a box array \meta{name}.
  This corresponds to the standard \LaTeX\ environment |lrbox|, but
  the storage operation is global. As long as \refCom{boxarrayreset} is
  not used, every new \refEnv{boxarraystore} adds a further box to
  the array.

\begin{dispExample}
\boxarrayreset
\begin{boxarraystore}{default}\fbox{Mary}\end{boxarraystore}
\begin{boxarraystore}{default}\fbox{Had}\end{boxarraystore}
\begin{boxarraystore}{default}\fbox{a}\end{boxarraystore}
\begin{boxarraystore}{default}\fbox{Little}\end{boxarraystore}
\begin{boxarraystore}{default}\fbox{Lamb}\end{boxarraystore}
\useboxarray{5}\useboxarray{4}\useboxarray{3}\useboxarray{2}\useboxarray{1}\hfill
\useboxarray{1}\useboxarray{5}
\end{dispExample}
\end{docEnvironment}

\subsection{Retrieving Content}\label{subsec:magazine_retrieve}

\begin{docCommand}[doc new=2015-07-13]{boxarraygetsize}{\oarg{name}\marg{macro}}
\begin{articleside}[before skip=5pt]
  Stores the current size of a box array \meta{name} into a given \meta{macro}.
  If no \meta{name} is given, the already existing |default| box array is used.
\begin{dispExample}
\boxarraygetsize{\mysize}
Current size of the default box array:
\mysize.
\end{dispExample}
\tcblower\consumetcboxarray[myarticle]{2}{blanker,nobeforeafter,phantomlabel=myarticle-two,from=one,goto=three}
\end{articleside}
\end{docCommand}

\begin{docCommand}[doc new=2015-07-13]{useboxarray}{\oarg{name}\marg{index}}
  Typesets the box with the given \meta{index} number from the box array \meta{name}.
  If no \meta{name} is given, the already existing |default| box array is used.
  It is considered an error, if a not existing box array \meta{name} is used.
  It is silently ignored, if the \meta{index} is out of range.
  Note that \refCom{useboxarray} corresponds to the standard |\usebox| macro,
  respectively, |\copy|.
\begin{dispExample}
\boxarraygetsize{\mysize}
\foreach \n in  {1,...,\mysize} { \useboxarray{\n} }
\end{dispExample}
\end{docCommand}

\clearpage
\begin{docCommand}[doc new=2015-07-13]{usetcboxarray}{\oarg{name}\marg{index}\marg{options}}
  Typesets the box with the given \meta{index} number from the box array \meta{name}
  using \refCom{useboxarray} as content of a \refCom{tcbox}.
  If no \meta{name} is given, the already existing |default| box array is used.
  It is considered an error, if a not existing box array \meta{name} is used.
  It is silently ignored, if the \meta{index} is out of range.
  The \refCom{tcbox} can be customized by |tcolorbox| \meta{options}.
\begin{dispExample}
\boxarraygetsize{\mysize}
\foreach \n in  {1,...,\mysize} { \usetcboxarray{\n}{on line,colframe=yellow,
  colback=yellow!10} }
\end{dispExample}
\end{docCommand}


\begin{docCommand}[doc new=2015-07-13]{consumeboxarray}{\oarg{name}\marg{index}}
  Typesets the box with the given \meta{index} number from the box array \meta{name}.
  If no \meta{name} is given, the already existing |default| box array is used.
  It is considered an error, if a not existing box array \meta{name} is used.
  It is silently ignored, if the \meta{index} is out of range.
  In contrast to \refCom{useboxarray},
  \refCom{consumeboxarray} corresponds to the standard |\box| macro, i.e.
  after typesetting the box register is cleared and cannot be used again.
\begin{dispExample}
\boxarraygetsize{\mysize}
First run: \foreach \n in  {1,...,\mysize} { \consumeboxarray{\n} }
\par
Second run: \foreach \n in  {1,...,\mysize} { \consumeboxarray{\n} }
\end{dispExample}
\end{docCommand}


\begin{docCommand}[doc new=2015-07-13]{consumetcboxarray}{\oarg{name}\marg{index}\marg{options}}
\begin{articleside}[before skip=5pt]
  Typesets the box with the given \meta{index} number from the box array \meta{name}
  using \refCom{consumeboxarray} as content of a \refCom{tcbox}.
  If no \meta{name} is given, the already existing |default| box array is used.
  It is considered an error, if a not existing box array \meta{name} is used.
  It is silently ignored, if the \meta{index} is out of range.
  The \refCom{tcbox} can be customized by |tcolorbox| \meta{options}.
  After typesetting the box register is cleared and cannot be used again.
\tcblower\consumetcboxarray[myarticle]{3}{blanker,nobeforeafter,phantomlabel=myarticle-three,,from=two,goto=four}
\end{articleside}
\begin{exdispExample}{consumetcboxarray}
% \usepackage{lipsum}
\begin{tcolorbox}[enhanced jigsaw,size=fbox,width=6cm,
  colback=yellow!10,colframe=yellow!10!black,
  enforce breakable,% use only breakable in the real world!
  break at=5cm,
  watermark text=\arabic{tcbbreakpart},
  reset and store to box array
  ]
\lipsum[1]
\end{tcolorbox}

\consumeboxarray{2} \hfill \consumeboxarray{1} \hfill \consumeboxarray{1}
\end{exdispExample}
\end{docCommand}


\begin{docCommand}[doc new=2015-07-13]{boxarraygetbox}{\oarg{name}\marg{macro}\marg{index}}
  Assigns the box with the given \meta{index} number from the box array \meta{name}
  to a \meta{macro}.
  If no \meta{name} is given, the already existing |default| box array is used.
  It is considered an error, if a not existing box array \meta{name} is used.
  If the \meta{index} is out of range, the \meta{macro} will be undefined.
\begin{exdispExample}{boxarraygetbox}
\tcbox[size=small,colframe=blue!20,colback=yellow!5,on line,
  reset and store to box array]{Test}

\boxarraygetsize{\mysize} Array size: \mysize

\boxarraygetbox{\mybox}{1}
Box width: \the\wd\mybox
\quad\usebox{\mybox}
\end{exdispExample}
\end{docCommand}


\begin{docCommand}[doc new=2017-06-27]{ifboxarrayempty}{\oarg{name}\marg{index}\marg{true}\marg{false}}
  Tests the box with the given \meta{index} number from the box array \meta{name}
  for emptiness be empty and executes \meta{true} if it is empty, and \meta{false} otherwise.
  If no \meta{name} is given, the already existing |default| box array is used.
  It is considered an error, if a not existing box array \meta{name} is used.
\begin{exdispExample}{ifboxarrayempty}
\tcbox[size=small,colframe=blue!20,colback=yellow!5,on line,
  reset and store to box array]{Test}

\ifboxarrayempty{1}{no Box~1}{Box~1: \useboxarray{1}},
\ifboxarrayempty{2}{no Box~2}{Box~2: \useboxarray{2}}
\end{exdispExample}
\end{docCommand}


\clearpage
\subsection{Box Dimensions}\label{subsec:magazine_dimensions}

\begin{docCommand}[doc new=2015-07-13]{boxarraygetwidth}{\oarg{name}\marg{macro}\marg{index}}
  Assigns the width of the box with the given \meta{index} number from the box array \meta{name}
  to a \meta{macro}.
  If no \meta{name} is given, the already existing |default| box array is used.
  It is considered an error, if a not existing box array \meta{name} is used.
  If the \meta{index} is out of range, the \meta{macro} will be set to |0pt|.
\begin{exdispExample}{boxarraygetwidth}
\tcbox[size=small,colframe=blue!20,colback=yellow!5,on line,
  reset and store to box array]{Test}

\begin{tabular}{ll}
\useboxarray{1} & width of box 1: \boxarraygetwidth{\mylen}{1} \mylen\\
\useboxarray{2} & width of box 2: \boxarraygetwidth{\mylen}{2} \mylen
\end{tabular}
\end{exdispExample}
\end{docCommand}


\begin{docCommand}[doc new=2015-07-13]{boxarraygetheight}{\oarg{name}\marg{macro}\marg{index}}
  Assigns the height of the box with the given \meta{index} number from the box array \meta{name}
  to a \meta{macro}.
  If no \meta{name} is given, the already existing |default| box array is used.
  It is considered an error, if a not existing box array \meta{name} is used.
  If the \meta{index} is out of range, the \meta{macro} will be set to |0pt|.
\begin{exdispExample}{boxarraygetheight}
\tcbox[size=small,colframe=blue!20,colback=yellow!5,on line,
  reset and store to box array]{Test}

\begin{tabular}{ll}
\useboxarray{1} & height of box 1: \boxarraygetheight{\mylen}{1} \mylen\\
\useboxarray{2} & height of box 2: \boxarraygetheight{\mylen}{2} \mylen
\end{tabular}
\end{exdispExample}
\end{docCommand}


\begin{docCommand}[doc new=2015-07-13]{boxarraygetdepth}{\oarg{name}\marg{macro}\marg{index}}
  Assigns the depth of the box with the given \meta{index} number from the box array \meta{name}
  to a \meta{macro}.
  If no \meta{name} is given, the already existing |default| box array is used.
  It is considered an error, if a not existing box array \meta{name} is used.
  If the \meta{index} is out of range, the \meta{macro} will be set to |0pt|.
\begin{exdispExample}{boxarraygetdepth}
\tcbox[size=small,colframe=blue!20,colback=yellow!5,on line,
  reset and store to box array]{Test}

\begin{tabular}{ll}
\useboxarray{1} & depth of box 1: \boxarraygetdepth{\mylen}{1} \mylen\\
\useboxarray{2} & depth of box 2: \boxarraygetdepth{\mylen}{2} \mylen
\end{tabular}
\end{exdispExample}
\end{docCommand}


\clearpage
\begin{docCommand}[doc new=2015-07-13]{boxarraygettotalheight}{\oarg{name}\marg{macro}\marg{index}}
\begin{articleside}[before skip=5pt]
  Assigns the total height of the box with the given \meta{index} number from the box array \meta{name}
  to a \meta{macro}.
  If no \meta{name} is given, the already existing |default| box array is used.
  It is considered an error, if a not existing box array \meta{name} is used.
  If the \meta{index} is out of range, the \meta{macro} will be set to |0pt|.
\tcblower\consumetcboxarray[myarticle]{4}{blanker,nobeforeafter,phantomlabel=myarticle-four,from=three}
\end{articleside}
\begin{exdispExample}{boxarraygettotalheight}
\boxarrayreset
\tcbox[size=small,colframe=blue!20,colback=yellow!5,on line,
  store to box array]{Test}

\begin{tabular}{ll}
\useboxarray{1} & total height of box 1: \boxarraygettotalheight{\mylen}{1} \mylen\\
\useboxarray{2} & total height of box 2: \boxarraygettotalheight{\mylen}{2} \mylen
\end{tabular}
\end{exdispExample}
\end{docCommand}

\clearpage
\subsection{Leaflet Example}
The following full application example can be used to create leaflets.
Obviously, the code can be adapted and customized in many ways.

\begin{tcblisting}{
  enhanced jigsaw,lower separated=false,breakable,
  listing style=mydocumentation,base example,
  listing and comment,
  pdf comment,freeze pdf,
  comment style={raster columns=1},
  compilable listing,
  run pdflatex}
\documentclass[a4paper,landscape]{article}
\usepackage[noheadfoot,margin=0pt]{geometry}
\usepackage[skins,raster,magazine]{tcolorbox}
\usepackage{lipsum}

\newenvironment{leaflet}[1][]{%
  \begin{tcolorbox}[nobeforeafter,empty,colback=white,
    sharp corners,size=minimal,left=10mm,right=10mm,top=10mm,bottom=10mm,
    width=\textwidth/3,
    breakable,
    break at=\textheight,
    height fixed for=all,
    reset box array,
    store to box array,#1]}
  {\end{tcolorbox}%
    \begin{tcbitemize}[raster columns=3,raster equal skip=0pt,blankest]
      \tcbitem\consumeboxarray{5}
      \tcbitem\consumeboxarray{6}
      \tcbitem\consumeboxarray{1}
      \tcbitem\consumeboxarray{2}
      \tcbitem\consumeboxarray{3}
      \tcbitem\consumeboxarray{4}
    \end{tcbitemize}%
  }

\pagestyle{empty}
\begin{document}

\begin{leaflet}[underlay={\node[above=5mm,font=\footnotesize]
    at (frame.south) {- \arabic{tcbbreakpart} -};}]
  \includegraphics[width=\linewidth]{Basilica_5.png}
  \begin{center}
  \bfseries\LARGE Example
  \end{center}

  \section{Introduction}
  \lipsum[1]

  \section{Main Part A}
  \lipsum[2-8]

  \section{Main Part B}
  \lipsum[9-15]

  \section{Conclusion}
  \lipsum[16-18]
\end{leaflet}

\end{document}
\end{tcblisting}


