diff -r fc7e0b8ed9d3 -r 9c74d00ce93e graphics/SFC_Objects.py
--- a/graphics/SFC_Objects.py	Mon Dec 10 15:52:49 2007 +0100
+++ b/graphics/SFC_Objects.py	Wed Dec 26 16:38:09 2007 +0100
@@ -369,21 +369,24 @@
     def ProcessDragging(self, movex, movey):
         handle_type, handle = self.Handle
         if handle_type == HANDLE_MOVE:
+            movex = max(-self.BoundingBox.x, movex)
+            movey = max(-self.BoundingBox.y, movey)
             action_block = None
             if self.Parent.GetDrawingMode() == FREEDRAWING_MODE:
                 self.Move(movex, movey)
                 self.RefreshConnected()
-                return True, True
+                return movex, movey
             elif self.Initial:
                 self.MoveActionBlock((movex, movey))
                 self.Move(movex, movey, self.Parent.Wires)
                 self.RefreshOutputPosition((movex, movey))
+                return movex, movey
             else:
                 self.MoveActionBlock((movex, 0))
                 self.Move(movex, 0)
                 self.RefreshInputPosition()
                 self.RefreshOutputPosition()
-            return True, False
+                return movex, 0
         else:
             return Graphic_Element.ProcessDragging(self, movex, movey)
     
@@ -719,10 +722,11 @@
     # Refreshes the transition state according to move defined and handle selected
     def ProcessDragging(self, movex, movey):
         if self.Parent.GetDrawingMode() != FREEDRAWING_MODE:
+            movex = max(-self.BoundingBox.x, movex)
             self.Move(movex, 0)
             self.RefreshInputPosition()
             self.RefreshOutputPosition()
-            return True, False
+            return movex, 0
         else:
             return Graphic_Element.ProcessDragging(self, movex, movey)
     
@@ -1132,13 +1136,14 @@
         handle_type, handle = self.Handle
         # A connector has been handled
         if handle_type == HANDLE_CONNECTOR:
+            movex = max(-self.BoundingBox.x, movex)
             self.MoveConnector(handle, movex)
             if self.Parent.GetDrawingMode() != FREEDRAWING_MODE:
                 self.RefreshConnectedPosition(handle)
-            return True, False
+            return movex, 0
         elif self.Parent.GetDrawingMode() == FREEDRAWING_MODE:
             return Graphic_Element.ProcessDragging(self, movex, movey)
-        return False, False
+        return 0, 0
     
     # Refresh output element model
     def RefreshOutputModel(self, move=False):
@@ -1316,9 +1321,10 @@
     # Refreshes the jump state according to move defined and handle selected
     def ProcessDragging(self, movex, movey):
         if self.Parent.GetDrawingMode() != FREEDRAWING_MODE:
+            movex = max(-self.BoundingBox.x, movex)
             self.Move(movex, 0)
             self.RefreshInputPosition()
-            return True, False
+            return movex, 0
         else:
             return Graphic_Element.ProcessDragging(self, movex, movey)
     
@@ -1505,13 +1511,14 @@
         if self.Parent.GetDrawingMode() != FREEDRAWING_MODE:
             handle_type, handle = self.Handle
             if handle_type == HANDLE_MOVE:
+                movex = max(-self.BoundingBox.x, movex)
                 wires = self.Input.GetWires()
                 if len(wires) == 1:
                     input_pos = wires[0][0].EndConnected.GetPosition(False)
                     if self.Pos.x - input_pos.x + movex >= SFC_WIRE_MIN_SIZE:
                         self.Move(movex, 0)
-                        return True, False
-                return False, False
+                        return movex, 0
+                return 0, 0
             else:
                 return Graphic_Element.ProcessDragging(self, movex, movey)
         else: