OWDataProjectionWidget: Minor refactor

Author: VesnaT

Orange/widgets/visualize/utils/widget.py

@@ -437,7 +437,7 @@ def set_data(self, data):
                         self.effective_data.X, equal_nan=True))
         if self._invalidated:
             self.clear()
-        self.cb_class_density.setEnabled(self.can_draw_density())
+        self.enable_controls()
 
     def check_data(self):
         self.valid_data = None
@@ -446,6 +446,9 @@ def check_data(self):
     def use_context(self):
         pass
 
+    def enable_controls(self):
+        self.cb_class_density.setEnabled(self.can_draw_density())
+
     @Inputs.data_subset
     @check_sql_input
     def set_subset_data(self, subset):