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%D \module
%D [ file=s-pre-60,
%D version=2004.03.15,
%D title=\CONTEXT\ Style File,
%D subtitle=Presentation Environment 60,
%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.
\newcounter\StepCounter
\newcounter\StepMaximum
\useJSscripts[stp]
\startsetups[set-stepper]
\ifnum\getvariable{stepper}{nofsteps}>\StepMaximum
\dostepwiserecurse {\numexpr(\StepMaximum+1)} {\getvariable{stepper}{nofsteps}} {1}
{\doifnotmode{nosteps,nostep}
{\expanded{\defineproperty[step:\recurselevel][layer][state=stop,global=yes]}}}
\xdef\StepMaximum{\getvariable{stepper}{nofsteps}}
\fi
\stopsetups
\setvariables
[stepper]
[set=\setups{set-stepper},
nofsteps=50]
\defineproperty[step:busy][layer][state=start]
\definereference [SetupStepper] [JS(SetupStepper{step,\StepMaximum})]
\definereference [ResetStepper] [JS(ResetStepper)]
\definereference [CheckStepper] [JS(CheckStepper{\StepCounter})]
\definereference [InvokeStepper] [JS(InvokeStepper)]
\def\ResetStep {\doglobal\newcounter\StepCounter}
\def\NextStep {\doglobal\increment \StepCounter}
\def\PrevStep {\doglobal\decrement \StepCounter}
% todo: roll back blank
\def\StartStep
{\ifvmode
\scratchskip\lastskip
\vskip-\scratchskip
\startproperty[step:\StepCounter]%
\vskip\scratchskip
\else
\startproperty[step:\StepCounter]%
\fi
\ignorespaces}
\def\StopStep
{\removeunwantedspaces
\stopproperty}
\def\StartSteps{\ResetStep\NextStep\StartStep}
\def\StopSteps {\StopStep\PrevStep}
\def\FlushStep {\StopStep\NextStep\StartStep}
\appendtoks
\ResetStep
\to \everyaftershipout
\def\StartBusy{\startproperty[step:busy]\ignorespaces}
\def\StopBusy {\removeunwantedspaces\stopproperty}
\setupinteraction
[openaction=SetupStepper,
openpageaction=CheckStepper,
closepageaction=ResetStepper]
\defineoverlay[invoke][\overlaybutton{InvokeStepper}]
\setupbackgrounds
[text]
[background=invoke]
\endinput
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