@staticmethod
    def _mouse_event_to_message(event):
        if event.inaxes and event.inaxes.get_navigate():
            try:
                s = event.inaxes.format_coord(event.xdata, event.ydata)
            except (ValueError, OverflowError):
                pass
            else:
                s = s.rstrip()
                artists = [a for a in event.inaxes._mouseover_set
                           if a.contains(event)[0] and a.get_visible()]
                if artists:
                    a = cbook._topmost_artist(artists)
                    if a is not event.inaxes.patch:
                        data = a.get_cursor_data(event)
                        if data is not None:
                            data_str = a.format_cursor_data(data).rstrip()
                            if data_str:
                                s = s + '\n' + data_str
                return s
        return ""