Tkinter slowness improvements

previously, I had made lots of changes to, when a window is closed,
withdraw the dialog so that the user does not see the window being
destroyed piece by piece.  This is especially true for windows
containing matplotlib plots, which delete slowly and painfully.
This call was not being made when a window was destroyed by the
root window being destroyed, so I overload the tk destroy function
to withdraw the window invariably prior to destruction.

SignalIntegrity/App/SParameterViewerWindow.py

@@ -276,6 +276,10 @@ def onClosing(self):
         self.withdraw()
         self.destroy()
 
+    def destroy(self):
+        tk.Toplevel.withdraw(self)
+        tk.Toplevel.destroy(self)
+
     def PlotSParameter(self):
         import SignalIntegrity.Lib as si
         self.topLeftPlot.cla()

SignalIntegrity/App/SignalIntegrityApp.py

@@ -312,10 +312,13 @@ def onResize(self,event):
 
         self.deltaWidth=4
         self.deltaHeight=50
-        self.Drawing.canvas.config(width=event.width-self.deltaWidth,height=event.height-self.deltaHeight)
-        SignalIntegrity.App.Project['Drawing.DrawingProperties.Width']=self.Drawing.canvas.winfo_width()
-        SignalIntegrity.App.Project['Drawing.DrawingProperties.Height']=self.Drawing.canvas.winfo_height()
-        SignalIntegrity.App.Project['Drawing.DrawingProperties.Geometry']=self.root.geometry()
+        try:
+            self.Drawing.canvas.config(width=event.width-self.deltaWidth,height=event.height-self.deltaHeight)
+            SignalIntegrity.App.Project['Drawing.DrawingProperties.Width']=self.Drawing.canvas.winfo_width()
+            SignalIntegrity.App.Project['Drawing.DrawingProperties.Height']=self.Drawing.canvas.winfo_height()
+            SignalIntegrity.App.Project['Drawing.DrawingProperties.Geometry']=self.root.geometry()
+        except tk.TclError:
+            pass
 
     def onKey(self,event):
 #       print "pressed", repr(event.keycode), repr(event.keysym)

SignalIntegrity/App/Simulator.py

@@ -138,6 +138,10 @@ def onClosing(self):
         self.withdraw()
         self.destroy()
 
+    def destroy(self):
+        tk.Toplevel.withdraw(self)
+        tk.Toplevel.destroy(self)
+
     def onAutoscale(self):
         self.plt.autoscale(True)
         self.f.canvas.draw()