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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
-
-\unexpanded\def\startlayerproperty
- {\pushmacro\currentviewerlayer % grouped (used in interaction)
- \let\currentlayerproperty\currentproperty % can be cross group
- \dotriggerviewerlayer\currentlayerproperty}
-
-\unexpanded\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.enable()}%
- \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
-