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%D \module
%D [ file=prop-lay,
%D version=2003.04.20,
%D title=\CONTEXT\ Property Macros,
%D subtitle=Layers,
%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 Property Macros / Layers}
%D Highly experimental, will probably change/evolve. Also, quite certainly
%D we will no longer share code between mkii and mkiv.
% test, nesting is somewhat special with layers
%
% \defineproperty[hans][layer]
% \defineproperty[ton] [layer]
% \setupheadertexts[no layer]
% 1\startproperty[hans]2\startproperty[ton]3\stopproperty4\stopproperty5
\unprotect
% will be redone ... no longer using property mechanism (less clashes)
\let\currentviewerlayer\empty
\appendtoks
\let\currentviewerlayer\empty
\to \everypagebody
\def\startlayerproperty
{\pushmacro\currentviewerlayer % grouped (used in interaction)
\let\currentlayerproperty\currentproperty % can be cross group
\dotriggerviewerlayer\currentlayerproperty}
\def\stoplayerproperty
{\popmacro\currentviewerlayer % grouped (used in interaction)
\let\currentlayerproperty\previousproperty % can be cross group
\dotriggerviewerlayer\currentlayerproperty}
\def\checklayerproperty % could be made more clever
{\registerviewerlayer\currentproperty\currentproperty
\ctxlua{backends.codeinjections.defineviewerlayer{
tag = "\currentproperty",
title = "\checkedpropertyparameter\c!title\currentproperty",
visible = "\checkedpropertyparameter\c!state\v!start",
kind = 0, % 1 == frozen
printable = "\checkedpropertyparameter\v!printable\v!yes" % v! looks wrong
}}}
%D \starttext
%D
%D \setuppapersize[S4][S4]
%D \setuplayout[middle]
%D \setupcolors[state=start]
%D \setupinteraction[state=start,color=,contrastcolor=]
%D
%D \defineproperty [L1] [layer] [title=layer 1]
%D \defineproperty [L2] [layer] [title=layer 2]
%D
%D \button{HIDE L1}[HideLayer{L1}]
%D \button{VIDE L1}[VideLayer{L1}]
%D \button{TOGGLE L1}[ToggleLayer{L1}]
%D
%D \button{HIDE L2}[HideLayer{L2}]
%D \button{VIDE L2}[VideLayer{L2}]
%D \button{TOGGLE L2}[ToggleLayer{L2}]
%D
%D \noheaderandfooterlines \centerbox{\startoverlay
%D {\definedfont[Mono at 150pt]%
%D \startproperty[L1]\red TEST\stopproperty}
%D {\definedfont[Mono at 150pt]%
%D \startproperty[L2]\green TEST\stopproperty}
%D \stopoverlay} \page
%D
%D \noheaderandfooterlines \centerbox{\startoverlay
%D {\definedfont[Mono at 15pt]%
%D \goto{\startproperty[L1]\red TEST\stopproperty}[CloseDocument]}
%D {\definedfont[Mono at 15pt]%
%D \goto{\startproperty[L2]\green TEST\stopproperty}[CloseDocument]}
%D \stopoverlay} \page
%D
%D \startproperty[L1]
%D level 1 \startproperty[L2]level 2 \stopproperty level 1
%D \stopproperty
%D
%D \startproperty[L1]
%D level 1 \page \startproperty[L2]level 2 \stopproperty level 1
%D \stopproperty
%D
%D \stoptext
\def\doinitializelayoutcomponent#1#2%
{\ctxlua{backends.codeinjections.defineviewerlayer{% this will move to the lua end i.e be merged with register
tag = "#1:#2",
title = "#1 #2",
visible = "\v!start",
kind = 0, % 1 == frozen
printable = "\v!yes"
}}%
\edef\layoutcomponentboxattribute{attr \viewerlayerattribute \ctxlua{tex.write(viewerlayers.register('#1:#2',true))}\relax}%
\expandafter\glet\csname\??ly>#1:#2\endcsname\layoutcomponentboxattribute}
\def\dosetlayoutcomponentattribute#1#2% make this faster
{\expandafter\let\expandafter\layoutcomponentboxattribute\csname\??ly>#1:#2\endcsname
\ifx\layoutcomponentboxattribute\relax
\doinitializelayoutcomponent{#1}{#2}% get rid of { }
\fi}
\def\doresetlayoutcomponentattribute
{\let\layoutcomponentboxattribute\empty}
\let\setlayoutcomponentattribute \gobbletwoarguments
\let\resetlayoutcomponentattribute\relax
\let\layoutcomponentboxattribute \empty
\def\showlayoutcomponents
{\ctxlua{viewerlayers.enabled=true}%
\let\setlayoutcomponentattribute \dosetlayoutcomponentattribute
\let\resetlayoutcomponentattribute\doresetlayoutcomponentattribute}
\protect \endinput
% \starttext
% \showlayoutcomponents
% \setupinteraction[state=start]
% \setupheadertexts[{\goto{page 1}[page(2)]}]
% test \setlayoutcomponentattribute{test}{aap}\hbox \layoutcomponentboxattribute \bgroup aap
% \setlayoutcomponentattribute{test}{noot}\hbox \layoutcomponentboxattribute \bgroup noot
% \setlayoutcomponentattribute{test}{mies}\hbox \layoutcomponentboxattribute \bgroup mies
% \egroup noot \egroup aap \egroup
% test \setlayoutcomponentattribute{test}{hans}\hbox \layoutcomponentboxattribute \bgroup aap \hbox{!} aap\egroup
% test \page test \page
% \stoptext
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