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+%D \module
+%D   [       file=java-stp,
+%D        version=2004.03.15,
+%D          title=\CONTEXT\ JavaScript Macros,
+%D       subtitle=Stepping,
+%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.
+
+% we define ocglist global, otherwise we quickly run into a memory hog (even
+% out of memory in a 512 Meg machine)
+
+% we cannot use doc_visited[this.pageNum] instead of doc_currentstep because
+% of some funny side effect (i.e. dup or so)
+
+% todo: test with later as we do autoinsert now
+
+\startJSpreamble Steps used now
+
+var doc_ocglist     = this.getOCGs() ;
+var doc_stepname    = "step" ;
+var doc_currentstep =  0 ;
+var doc_maxstep     = 50 ;
+var doc_visited     = new Array() ;
+var doc_busy        = new Array() ;
+
+function SetupStepper(layername,laststep) {
+    doc_stepname = layername ;
+    doc_maxstep  = laststep ;
+    for (var i=0; i<=this.numPages; i++) {
+        doc_visited[i] = 0 ;
+        doc_busy[i] = 0 ;
+    }
+}
+
+for (var i=0; i<=this.numPages; i++) {
+    doc_visited[i] = 0 ;
+    doc_busy[i] = 0 ;
+}
+
+function GetOCG(name) {
+    for (var i=0; i < doc_ocglist.length; i++) {
+        if (doc_ocglist[i].name == name) {
+            return doc_ocglist[i] ;
+        }
+    }
+    return null ;
+}
+
+function CheckBusy() {
+     var ocg = GetOCG("step:busy") ;
+     if (ocg != null) {
+         if (doc_visited[this.pageNum]==0) {
+             ocg.state = true ;
+         } else {
+             if (doc_visited[this.pageNum]<doc_busy[this.pageNum]) {
+                 ocg.state = true ;
+             } else {
+                 ocg.state = false ;
+             }
+         }
+     }
+}
+
+function SetStepper(maxstep,state) {
+    for (var i=1; i<=maxstep; i++) {
+        try {
+            var ocg = GetOCG(doc_stepname + ':' + String(i)) ;
+            if (ocg != null) {
+                ocg.state = state ;
+            }
+        } catch (e) {
+            return ;
+        }
+    }
+}
+
+function CheckStepper(maxsteps) {
+    SetStepper(doc_visited[this.pageNum], true) ;
+    doc_busy[this.pageNum] = Number(maxsteps) ;
+    doc_currentstep = doc_visited[this.pageNum] ;
+    CheckBusy() ;
+}
+
+function ResetStepper() {
+    SetStepper(doc_maxstep, false) ;
+    doc_currentstep = 0 ;
+}
+
+function InvokeStepper() {
+    try {
+        if (doc_currentstep<doc_busy[this.pageNum]) {
+            doc_currentstep += 1 ;
+            doc_visited[this.pageNum] = doc_currentstep ;
+            var ocg = GetOCG(doc_stepname + ':' + String(doc_currentstep)) ;
+            if (ocg != null) {
+                ocg.state = true ;
+            }
+        } else {
+            if (this.pageNum+1==this.numPages) {
+                this.pageNum  = 0 ;
+            } else {
+                this.pageNum += 1 ;
+            }
+        }
+        CheckBusy() ;
+    } catch (e) {
+        return ;
+    }
+}
+
+\stopJSpreamble
+
+% \definereference [SetupStepper]  [JS(SetupStepper{step,50})]
+% \definereference [ResetStepper]  [JS(ResetStepper)]
+% \definereference [CheckStepper]  [JS(CheckStepper{\StepCounter})]
+% \definereference [InvokeStepper] [JS(InvokeStepper)]
+
+\endinput