@classmethod
def get_virtualenv_creation_params(cls, parent):
    """
        Show the dialog and return the information needed to create the
        virtualenv. Returns None if the dialog has been canceled.
        """
    dlg = cls(parent)
    if dlg.exec_() == dlg.Accepted:
        return dlg.path, dlg.interprerer, dlg.use_system_site_packages
    else:
        return None
