python - Usage of BoundsEditor in TraitsUI -

i want use boundseditor (in traitsui) range selection. how access high , low values? testing use rangeeditor - works expected (on moving slider current value printed). cannot values out of boundseditor. pointers appreciated.

i use following (simplified code):

from traits.api \     import hastraits, button, range traitsui.api \     import view, item, group, rangeeditor traitsui.qt4.extra.bounds_editor import boundseditor  class parameters(hastraits):     rgb_range = range(0.,1.0)     range1 = rgb_range     range2 = rgb_range     eval_button = button("eval")        traits_view= view(         item('range1')), #editor=rangeeditor()         item('range2', editor=boundseditor()),         item('eval_button'))       def _range1_changed(self, value):         print(value)      def _range2_changed(self, *arg, **kwargs):         print(arg)      def _range2_changed(self, *arg, **kwargs):         print(arg)      def _range2_low_changed(self, *arg, **kwargs):         print(arg)      def _range2_high_changed(self, *arg, **kwargs):         print(arg)      def _eval_button_fired(self):         print(self.range1)         print(self.range2)   if __name__ == '__main__':     alg = parameters()     alg.configure_traits()  

i beginning learn traits, sure else can explain better me. using example http://blog.enthought.com/enthought-tool-suite/traits/new-double-slider-editor/#.vgfbyltgtwq. declared variables low , high values, , passed these boundseditor(). declared functions run when values change. got think close looking for.

from traits.api \     import hastraits, button, range, float traitsui.api \     import view, item, group, rangeeditor traitsui.qt4.extra.bounds_editor import boundseditor  class parameters(hastraits):     rgb_range = range(0.,1.0)     range1 = rgb_range     range2 = rgb_range     low_val = float(0.0)     high_val = float(1.0)     eval_button = button("eval")        traits_view= view(         item('range1', editor=rangeeditor()),         item('range2', editor=boundseditor(low_name = 'low_val', high_name = 'high_val')),         item('eval_button'))       def _range1_changed(self, value):         print(value)      def _low_val_changed(self):         print(self.low_val)      def _high_val_changed(self):         print(self.high_val)      def _eval_button_fired(self):         print(self.range1)         print(self.low_val)         print(self.high_val)  if __name__ == '__main__':     alg = parameters()     alg.configure_traits()