def dockable_should_close ( self ):
        element = self.element
        if element is None:
            element = self.ui.view.content

        if not isinstance( element, Group ):
            element = Group().set( content = [ element ] )

        group      = Group().set( content = [ element ] )
        self._view = View().set( **self.ui.view.get() ).set( content = group,
                                                             title   = '' )

        # FIXME: The following private traits are being set here to facilitate
        # rebuilding the ui (which will require the context and the handler).
        # When a current dock control is closed (close_dock_control method), the
        # contents of self.ui have been disposed of and self.ui is now None.
        # Now if a new UI needs to be created by calling dockable_get_control
        # (e.g., when doing an 'undock' action on a dock window), we need to
        # pass on the context and handler to the UI. Therefore, we are setting
        # these private traits here so dockable_get_control can access them.
        # In future, we need to investigate if there is a better way to do this.

        self._context = self.ui.context.copy()
        # Make copy since context will be emptied when calling self.ui.dispose()
        self._handler = self.ui.handler

        return (self.should_close or (self.element is None))

    #---------------------------------------------------------------------------
    #  Gets a control that can be docked into a DockWindow:
    #---------------------------------------------------------------------------
Should the current DockControl be closed before creating the new
dataset/ETHPy150Open enthought/traitsui/traitsui/dockable_view_element.py/DockableViewElement.dockable_should_close