# HG changeset patch
# User drewp
# Date 2002-07-13 04:26:59
# Node ID 57319ec2bfad2bcce05bb1a96888b0ea24e95dc5
# Parent  139d6ed2fbaa75735e1e410ee64b6aa95c14fbe2

tracing etc seems to work

diff --git a/light8/ExtSliderMapper.py b/light8/ExtSliderMapper.py
--- a/light8/ExtSliderMapper.py
+++ b/light8/ExtSliderMapper.py
@@ -74,8 +74,19 @@ class SliderMapping:
             self.lastbgcolor = color
     def set_sublevel_var(self, newvar):
         'newvar is one of the variables in scalelevels'
-        self.sublevel = newvar
-        self.sublevel.trace('w', self.unsync)
+
+        if newvar is not self.sublevel:
+            try:
+                # remove an old trace
+                self.sublevel.trace_vdelete('w',self.sublevel.unsync_trace_cbname)
+            except AttributeError:
+                pass # it didn't have one
+
+            self.sublevel = newvar
+            self.sublevel.unsync_trace_cbname = self.sublevel.trace('w', self.unsync)
+            
+#        self.sublevel = newvar
+
         if self.sublabel:
             self.sublabel.configure(textvariable=newvar)
         self.check_synced()
diff --git a/light8/uihelpers.py b/light8/uihelpers.py
--- a/light8/uihelpers.py
+++ b/light8/uihelpers.py
@@ -172,7 +172,7 @@ class FancyDoubleVar(DoubleVar):
         
         # we build a list of the trace callbacks (the py functrions and the tcl functionnames)
         self.callbacklist[cbname]= mode
-        print "added trace:",callback,cbname
+#        print "added trace:",callback,cbname
         
         return cbname
     trace=trace_variable