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%D \module
%D [ file=page-pls,
%D version=2003.03.16,
%D title=\CONTEXT\ Page Macros,
%D subtitle=Page Setup,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
%C details.
\writestatus{loading}{ConTeXt Page Macros / Extra Page Building}
%D This still needs some work, especially the dimensions need to be
%D checked cq.\ optimized. Beware: method has become alternative!
%D This feature has been present for a while but has never been
%D exploited: pluggable pagebuilders. The next example code
%D demonstrates the application of one such a plug-in. This variant
%D support \type {page}, \type {leftpage} and \type {rightpage}
%D definitions where specific areas are placed with the \type
%D {\pagearea} command.
%D
%D \starttyping
%D \setupheadertexts[the header text]
%D \setupfootertexts[a pretty long left footer text][something right]
%D \setupbottomtexts[a not so long bottom text][another right thing]
%D \setuptexttexts [margin][something marginal][indeed]
%D
%D \startpagelayout[leftpage]
%D \setupTABLE[offset=overlay]
%D \setupTABLE[c][1][width=\leftmarginwidth]
%D \setupTABLE[c][2][width=\textwidth]
%D \setupTABLE[c][3][width=\rightmarginwidth]
%D \bTABLE
%D \bTR
%D \bTD[nx=3,background=color,backgroundcolor=green]
%D \pagearea[header][text][middle]
%D \eTD
%D \eTR
%D \bTR
%D \bTD \pagearea[text][margin][left] \eTD
%D \bTD[nx=2] \pagearea[text] \eTD
%D \eTR
%D \bTR
%D \bTD[nx=3,offset=overlay]
%D {\bTABLE
%D \bTR
%D \bTD \pagearea[footer][text][left] \eTD
%D \bTD \pagearea[bottom][text][left] \eTD
%D \eTR
%D \eTABLE}
%D \eTD
%D \eTR
%D \eTABLE
%D \stoppagelayout
%D
%D \startpagelayout[rightpage]
%D \setupTABLE[offset=overlay]
%D \setupTABLE[c][1][width=\leftmarginwidth]
%D \setupTABLE[c][2][width=\textwidth]
%D \setupTABLE[c][3][width=\rightmarginwidth]
%D \bTABLE
%D \bTR
%D \bTD[nx=3] \pagearea[header][text][middle] \eTD
%D \eTR
%D \bTR
%D \bTD \pagearea[text][margin][left] \eTD
%D \bTD[nx=2] \pagearea[text] \eTD
%D \eTR
%D \bTR
%D \bTD[nx=3,offset=overlay]
%D {\bTABLE
%D \bTR
%D \bTD \pagearea[bottom][text][right] \eTD
%D \bTD \pagearea[footer][text][right] \eTD
%D \eTR
%D \eTABLE}
%D \eTD
%D \eTR
%D \eTABLE
%D \stoppagelayout
%D
%D \setupcolors[state=start]
%D
%D \setuppagenumbering[alternative=doublesided,location=]
%D
%D \setuplayout[alternative=makeup]
%D
%D \definetextbackground
%D [test]
%D [state=start,
%D background=color,
%D backgroundcolor=yellow]
%D
%D \starttext
%D
%D \dorecurse{10}{\input tufte \par}
%D
%D \input tufte \starttest \input tufte \stoptest \input tufte
%D
%D \starttabulate
%D \NC test \NC \starttest \input tufte \stoptest \NC \NR
%D \stoptabulate
%D
%D \dorecurse{10}{\input tufte \par}
%D
%D \stoptext
%D \stoptyping
\unprotect
\installcorenamespace{layoutmakeupalternative}
\def\page_boxes_construct_content_makeup#1#2#3% targetbox flusher box
{\setbox#1\hbox
{\vbox to \textheight
{\offinterlineskip
\vskip\dimexpr-1\topskip+\strutheight\relax % could be an option
\textwidth\makeupwidth
\hsize\textwidth
\boxmaxdepth\maxdepth
\noindent
\page_otr_command_package_contents#2#3}}%
\wd#1\makeupwidth
\ht#1\textheight
\dp#1\zeropoint
\hsize\paperwidth
\vsize\paperheight
\setbox#1\vbox{\csname\??layoutmakeupalternative\doifbothsidesoverruled\v!page\v!rightpage\v!leftpage\endcsname}%
\wd#1\paperwidth
\ht#1\paperheight
\dp#1\zeropoint}
\installlayoutalternative\v!makeup{\page_boxes_construct_content_makeup}
\newbox\b_page_area
\unexpanded\def\pagearea
{\dotripleempty\page_area}
\def\page_area
{\ifthirdargument
\expandafter\page_area_three
\else\ifsecondargument
\doubleexpandafter\page_area_two
\else
\doubleexpandafter\page_area_one
\fi\fi}
\def\page_area_three[#1][#2][#3]%
{\edef\m_page_area_three{#3}%
\ifx\m_page_area_three\v!left
\let\m_page_area_three\c!lefttext
\else\ifx\m_page_area_three\v!right
\let\m_page_area_three\c!righttext
\else
\let\m_page_area_three\c!middletext
\fi\fi
\page_area_indeed{#1}{#2}\m_page_area_three}
\def\page_area_two[#1][#2][#3]%
{\edef\m_page_area_three{\doifbothsidesoverruled\c!righttext\c!righttext\c!lefttext}%
\page_area_indeed{#1}{#2}\m_page_area_three}
\def\page_area_one[#1][#2][#3]%
{\edef\m_page_area_one{#1}
\ifx\m_page_area_one\v!text % copy due to trial runs in TABLE
\iftrialtypesetting
\fakebox\pagebox
\else
\page_backgrounds_add_to_text\pagebox
\page_grids_add_to_box\pagebox
\box\pagebox
\fi
\fi}
\def\page_area_indeed#1#2#3%
{\setbox\b_page_area\vbox{\getspecificlayouttext{#1}{#2}{#3}}%
\iftrialtypesetting
\fakebox\b_page_area
\else\ifcsname\??layoutbackgrounds#1#2\endcsname
\page_area_indeed_yes{#1}{#2}%
\else
\box\b_page_area
\fi\fi}
\def\page_area_indeed_yes#1#2%
{% todo: \localbackgroundframed{\??layoutbackgrounds#1#2}{#1:#2}
\localframed % todo:
[\??layoutbackgrounds#1#2]
[\c!width=\wd\b_page_area,
\c!height=\ht\b_page_area,
\c!offset=\v!overlay]
{\box\b_page_area}}
% to be done nicely (proper namespacing)
\setvalue{\??layoutmakeupalternative\v!leftpage }{\csname\??layoutmakeupalternative\v!page\endcsname}
\setvalue{\??layoutmakeupalternative\v!rightpage}{\csname\??layoutmakeupalternative\v!page\endcsname}
\unexpanded\def\startpagelayout
{\bgroup
\catcode\endoflineasciicode\ignorecatcode
\page_layouts_start_layout}
\let\stoppagelayout\relax
\def\page_layouts_start_layout[#1]#2\stoppagelayout
{\egroup
\setvalue{\??layoutmakeupalternative#1}{#2}}
\protect \endinput
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