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%D \module
%D [ file=page-log, % moved here from main-001
%D version=1997.03.31,
%D title=\CONTEXT\ Page Macros,
%D subtitle=Logos,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright={PRAGMA / Hans Hagen \& Ton Otten}]
%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 / Logos}
\unprotect
%D Although logos can conveniently be implemented on top of
%D background and text areas, we provide a dedicated mechanism
%D here. One reason is that such a separate mechanism cannot
%D interfere with the other ones, but an even more important
%D reason is that logos are kind of special in the sense that
%D they have a short life span and may change after the first
%D page.
%D \macros
%D {recalculatelogos,addlogobackground}
%D
%D The interface to the other low level page building routines
%D is provided by a macro that signals changes in layout
%D specifications:
%D
%D \starttyping
%D \recalculatelogos
%D \stoptyping
%D
%D as well as a simple placement macro:
%D
%D \starttyping
%D \addlogobackground <box>
%D \stoptyping
%D
%D In no way the following boolean switch should be used
%D directly.
\newif\ifnewlogos
\def\recalculatelogos
{\global\newlogostrue}
%D The current state of logos is registered in a status
%D variable \type {\logostatus}.
%D
%D \starttabulate[|l|l|l|]
%D \NC 0 \NC don't place \NC remains 0 \NC \NR
%D \NC 1 \NC place now \NC remains 1 \NC \NR
%D \NC 2 \NC calulate and place \NC becomes 1 \NC \NR
%D \NC 3 \NC calculate and place once \NC becomes 2 \NC \NR
%D \stoptabulate
\chardef\logostatus=0
\def\addlogobackground#1% todo: dimension spec
{\ifcase\logostatus \else
\ifcase\logostatus
% no logos to take care of
\or % 1
\ifnewlogos
\chardef\logostatus2
\setlogoboxes
\chardef\logostatus1
\global\newlogosfalse
\fi
\or % 2
\setlogoboxes
\chardef\logostatus1
\or % 3
\setlogoboxes
\global\chardef\logostatus2
\fi
\setbox#1\vbox
{\offinterlineskip
\doifmarginswapelse
{\copy\leftlogos}
{\copy\rightlogos}
\box#1}%
\fi}
%D For efficiency reasons (and since logos seldom change inside
%D a document) we can save the left and right hand (or first
%D and following page) logos in boxes. The areas are slightly
%D different from the ones used in backgrounds and text
%D placement, but still related to the page layout. The {\em
%D left} and {\em right edge}, as well as {\em top} and {\em
%D bottom} touch the bounding box of the paper and are
%D therefore not the sams as their background adn text
%D counterparts. In addition there are {\em left}, {\em right}
%D and {\em middle} areas as well as a {\em page} one.
\newbox\leftlogos
\newbox\rightlogos
\def\setlogoboxes
{\showmessage\m!layouts7\empty
\dosetlogobox\leftlogos\relax
\ifdoublesided
\dosetlogobox\rightlogos\doswapmargins
\fi}
\def\dosetlogobox#1#2%
{\global\setbox#1\vbox to \paperheight
{\dontcomplain % needed here ?
\calculatereducedvsizes % needed here ?
\offinterlineskip
#2\relax
\vskip-\topspace
\dodosetlogobox\v!top\blap
\vskip\topspace
\dodosetlogobox\v!header\blap
\vskip\dimexpr\headerheight+\headerdistance\relax
\dodosetlogobox\v!text\blap
\vskip\dimexpr\textheight+\footerdistance+\footerheight\relax
\dodosetlogobox\v!footer \tlap
\vfilll
\dodosetlogobox\v!bottom\tlap
\vskip\topspace}
\smashbox#1}
\def\dodosetlogobox#1#2%
{\hbox % width equals \makeupwidth
{\def\docommand##1%
{\donefalse
\ifnum\logostatus=3 \ExpandBothAfter
\doifinset{\getvalue{\??lo#1##1}}\requestedlogos\donetrue
\else
\doifvalue{\??lo#1##1\c!state}\v!start\donetrue
\fi
\ifdone
#2{\hbox{\getvalue{\??lo#1##1\c!command}}}%
\fi}%
\def\dodocommand##1##2##3##4##5##6%
{\hsmash
{\hskip-\texthoffset
\hbox to \paperwidth
{\rlap{\docommand##1}\hss\llap{\docommand##6}}%
\hskip-\paperwidth
\hbox to \paperwidth
{\hskip\texthoffset
\hskip-\leftmarginwidth
\hskip-\leftmargindistance
\hbox to \leftmarginwidth{\docommand##2\hss}%
\hskip\leftmargindistance
\hbox to \makeupwidth{\docommand##3\hss\docommand##4}%
\hskip\rightmargindistance
\hbox to \rightmarginwidth{\hss\docommand##5}%
\hfill}}}%
\normalbaselines
\settexthoffset
\hsmash
{\hbox to \makeupwidth{\hss\docommand\c!middle\hss}}%
\hsmash
{\hskip-\texthoffset
\hbox to \paperwidth{\docommand\v!page\hss}}%
\swapmargins
\doifbothsidesoverruled
{\dodocommand
\v!leftedge \v!leftmargin \v!left
\v!right \v!rightmargin \v!rightedge}
{\dodocommand
\v!leftedge \v!leftmargin \v!left
\v!right \v!rightmargin \v!rightedge}
{\dodocommand
\v!rightedge \v!rightmargin \v!right
\v!left \v!leftmargin \v!leftedge}}}
%D The user interface is relatively simple and provides
%D macros for assigning logos to logo areas as well as
%D forcing placement.
%D
%D \showsetup{definelogo}
%D \showsetup{placelogos}
\let\definedlogos \empty
\let\requestedlogos\empty
\long\def\dodefinelogo[#1][#2][#3][#4]%
{\addtocommalist{#1}\definedlogos
\long\setvalue{\??lo#2#3}{#1}%
\getparameters[\??lo#2#3][#4]%
\global\chardef\logostatus2 }
\def\definelogo
{\doquadrupleargument\dodefinelogo}
\def\placelogos
{\dosingleempty\doplacelogos}
\def\doplacelogos[#1]%
{\xdef\requestedlogos{\iffirstargument#1\else\definedlogos\fi}%
\global\chardef\logostatus3 }
\protect \endinput
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