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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.
\unprotect
\let\currentlayerproperty\empty
\def\checklayerproperty
{\doifelse{\checkedpropertyparameter\v!printable\currentproperty}\v!no
{\def\printviewerlayer{0}}
{\def\printviewerlayer{1}}%
\dodefineviewerlayer
\currentproperty % tag
{\checkedpropertyparameter\c!title\currentproperty}%
{\checkedpropertyparameter\c!state\v!start}% visible or hidden
{0}% type (1=frozen)
{\printviewerlayer}}% 1=printable
\def\startlayerproperty
{\let\currentlayerproperty\currentproperty
\dostartviewerlayer\currentproperty}
\def\stoplayerproperty
{\dostopviewerlayer
\let\currentlayerproperty\previousproperty}
\def\domakelayerpropertylist
{\iflocation
\expandafter\domakeviewerlayerlist
\else
\expandafter\gobbleoneargument
\fi}
\setglobalsystemreference \rt!exec \v!HideLayer {hidelayer}
\setglobalsystemreference \rt!exec \v!VideLayer {videlayer}
\setglobalsystemreference \rt!exec \v!ToggleLayer {togglelayer}
\setexecutecommandcheck {hidelayer} \domakelayerpropertylist
\setexecutecommandcheck {videlayer} \domakelayerpropertylist
\setexecutecommandcheck {togglelayer} \domakelayerpropertylist
% \currentlayerproperty
% \checklayerproperty
% \startlayerproperty
% \stoplayerproperty
% \domakelayerpropertylist
%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
%D Handy for tracing:
\def\showlayoutcomponents
{\let\startlayoutcomponent\dostartlayoutcomponent
\let\stoplayoutcomponent \dostoplayoutcomponent}
\def\dodefinelayoutcomponent#1#2%
{\doifelsenothing{#2}%
{\defineproperty[#1][\s!layer]}%
{\defineproperty[#1][\s!layer][\c!title=#2]}}
\def\dostartlayoutcomponent#1#2%
{\doifelseproperty{#1}\donothing{\dodefinelayoutcomponent{#1}{#2}}%
\startproperty[#1]}
\def\dostoplayoutcomponent
{\stopproperty}
\let\startlayoutcomponent\gobbletwoarguments
\let\stoplayoutcomponent \relax
\protect \endinput
% \def\remaplayering
% {\dodoubleargument\doremaplayering}
%
% \def\remaplayering[#1][#2]%
% {\setvalue{\??lm#1}{#2}}
%
% \def\remappedlayering#1%
% {\ifcsname\??lm#1\endcsname
% \@EA\remappedlayering\csname\??lm#1\endcsname\else#1%
% \fi}
%
% \def\startshowlayering#1#2%
% {\ifshowlayering
% \defineproperty[\remappedlayering{#1}][\s!layer][\c!titel=#2]%
% \startproperty[\remappedlayering{#1}]%
% \fi}
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