1 files changed, 99 insertions, 0 deletions
diff --git a/tex/context/base/prop-lay.mkii b/tex/context/base/prop-lay.mkii
index 5dce6c33b..aeec94bb2 100644
--- a/tex/context/base/prop-lay.mkii
+++ b/tex/context/base/prop-lay.mkii
@@ -11,6 +11,11 @@
 %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
@@ -41,4 +46,98 @@
      \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}