def change_val(self, newval):
        floatVal = float(newval) * self.floatStepSize + self.floatMinVal
        self.setToolTip("%g" % floatVal)
        self.update_parent()
decodes a scaled integer to the correct number
dataset/ETHPy150Open VisTrails/VisTrails/vistrails/gui/mashups/mashups_widgets.py/QSliderWidget.change_val