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%D \module
%D [ file=page-col, % moved from page-ini
%D version=2011.12.07, % 2000.10.20,
%D title=\CONTEXT\ Page Macros,
%D subtitle=Column Helpers,
%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 / Column Helpers}
%D Here we implement a couple of helpers for dealing with columns. For
%D the moment we keep the names. When the mul and set modules are redone
%D these can be adapted or disappear.
\unprotect
%D We reserve a counter for the number of columns as well as the current
%D column. Both are not to be changed by users!
%newcount\nofcolumns \nofcolumns\plusone % already in core-ini.mkiv
\newcount\mofcolumns \mofcolumns\plusone
\newconstant\columndirection % 0:lr 1:rl
\setnewconstant\maxnofcolumns 50
\setnewconstant\allocatednofcolumns 0
\newdimen\columnwidth
\newdimen\columndistance
%D During initialization the temporary boxes are allocated. This enables us to
%D use as much columns as we want, without exhausting the pool of boxes too
%D fast. We could have packed them in one box, but we've got enough boxes.
%D
%D Two sets of boxes are declared, the txtboxes are used for the text, the
%D topboxes are for moved column floats.
\installcorenamespace{columntext}
\installcorenamespace{columnfooter}
\installcorenamespace{columntop}
\installcorenamespace{columnbottom}
\unexpanded\def\initializecolumns#1%
{\ifnum#1>\maxnofcolumns
\showmessage\m!columns1\maxnofcolumns
\nofcolumns\maxnofcolumns
\else
\nofcolumns#1\relax
\fi
\ifnum\nofcolumns>\allocatednofcolumns
\page_columns_allocate
\fi}
\def\page_columns_allocate
{\dorecurse\nofcolumns
{\ifnum\recurselevel>\allocatednofcolumns\relax
\ifcsname\??columntext\recurselevel\endcsname \else
\expandafter\newbox\csname\??columntext \recurselevel\endcsname % text
\expandafter\newbox\csname\??columnfooter\recurselevel\endcsname % footer
\expandafter\newbox\csname\??columntop \recurselevel\endcsname % top insert
\expandafter\newbox\csname\??columnbottom\recurselevel\endcsname % bottom insert
\fi
\fi}%
\global\allocatednofcolumns\nofcolumns}
\def\currentcolumn {1}
\def\firstcolumnbox {\columntextbox\plusone}
\def\currentcolumnbox {\columntextbox\mofcolumns}
\def\lastcolumnbox {\columntextbox\nofcolumns}
\def\firsttopcolumnbox {\columntopbox \plusone}
\def\currenttopcolumnbox {\columntopbox \mofcolumns}
\def\lasttopcolumnbox {\columntopbox \nofcolumns}
\def\columntextbox #1{\csname\??columntext \number#1\endcsname}
\def\columnfootbox #1{\csname\??columnfooter\number#1\endcsname}
\def\columntopbox #1{\csname\??columntop \number#1\endcsname}
\def\columnbotbox #1{\csname\??columnbottom\number#1\endcsname}
\unexpanded\def\columnsettextbox {\global\setbox\columntextbox}
\unexpanded\def\columnsetfootbox {\global\setbox\columnfootbox}
\unexpanded\def\columnsettopbox {\global\setbox\columntopbox}
\unexpanded\def\columnsetbotbox {\global\setbox\columnbotbox}
\unexpanded\def\columngettextbox {\copy\columntextbox}
\unexpanded\def\columngetfootbox {\copy\columnfootbox}
\unexpanded\def\columngettopbox {\copy\columntopbox}
\unexpanded\def\columngetbotbox {\copy\columnbotbox}
\unexpanded\def\columnerasetextboxes{\dorecurse\allocatednofcolumns{\columnsettextbox\recurselevel\emptybox}}
\unexpanded\def\columnerasefootboxes{\dorecurse\allocatednofcolumns{\columnsetfootbox\recurselevel\emptybox}}
\unexpanded\def\columnerasetopboxes {\dorecurse\allocatednofcolumns{\columnsettopbox \recurselevel\emptybox}}
\unexpanded\def\columnerasebotboxes {\dorecurse\allocatednofcolumns{\columnsetbotbox \recurselevel\emptybox}}
%D Without going in details we present two macro's which handle the columns. The
%D action which is transfered by the the first and only parameter can do something
%D with \type {\currentcolumnbox}. In case of the mid columns, \type
%D {\firstcolumnbox} and \type {\lastcolumnbox} are handled outside these macro's.
% \unexpanded\def\dohandlecolumn#1%
% {\mofcolumns\recurselevel
% \let\currentcolumn\recurselevel
% #1\relax}
%
% \unexpanded\def\dohandleallcolumns#1%
% {\dorecurse\nofcolumns{\dohandlecolumn{#1}}}
%
% \unexpanded\def\dohandlerevcolumns#1%
% {\dostepwiserecurse\nofcolumns\plusone\minusone{\dohandlecolumn{#1}}}
%
% \unexpanded\def\dohandlemidcolumns#1%
% {\dohandleallcolumns
% {\ifnum\recurselevel>\plusone
% \ifnum\recurselevel<\nofcolumns
% \dohandlecolumn{#1}%
% \fi
% \fi}}
%
% As we don't nest we can use a fast variant:
\unexpanded\def\dohandleallcolumnscs#1{\let\page_columns_action #1\page_columns_all_indeed}
\unexpanded\def\dohandleallcolumns #1{\def\page_columns_action{#1}\page_columns_all_indeed}
\unexpanded\def\dohandlerevcolumnscs#1{\let\page_columns_action #1\page_columns_rev_indeed}
\unexpanded\def\dohandlerevcolumns #1{\def\page_columns_action{#1}\page_columns_rev_indeed}
\unexpanded\def\dohandlemidcolumnscs#1{\let\page_columns_action #1\page_columns_mid_indeed}
\unexpanded\def\dohandlemidcolumns #1{\def\page_columns_action{#1}\page_columns_mid_indeed}
\unexpanded\def\page_columns_all_indeed
{\mofcolumns\plusone
\edef\currentcolumn{\the\mofcolumns}%
\page_columns_action\relax
\ifnum\mofcolumns<\nofcolumns
\expandafter\page_columns_all_next
\fi}
\unexpanded\def\page_columns_all_next
{\advance\mofcolumns\plusone
\edef\currentcolumn{\the\mofcolumns}%
\page_columns_action\relax
\ifnum\mofcolumns<\nofcolumns
\expandafter\page_columns_all_next
\fi}
\unexpanded\def\page_columns_rev_indeed
{\mofcolumns\nofcolumns
\edef\currentcolumn{\the\mofcolumns}%
\page_columns_action\relax
\ifnum\mofcolumns>\plusone
\expandafter\page_columns_rev_prev
\fi}
\unexpanded\def\page_columns_rev_prev
{\advance\mofcolumns\minusone
\edef\currentcolumn{\the\mofcolumns}%
\page_columns_action\relax
\ifnum\mofcolumns>\plusone
\expandafter\page_columns_rev_prev
\fi}
\unexpanded\def\page_columns_mid_indeed
{\mofcolumns\plustwo
\ifnum\mofcolumns<\nofcolumns
\expandafter\page_columns_mid_next
\fi}
\unexpanded\def\page_columns_mid_next
{\edef\currentcolumn{\the\mofcolumns}%
\page_columns_action\relax
\advance\mofcolumns\plusone
\ifnum\mofcolumns<\nofcolumns
\expandafter\page_columns_mid_next
\fi}
\protect \endinput
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