def _set_lines(self):
        """
        Set the list of formatted text items to scroll through.
        """
        first_text = ""
        if self.is_enabled:
            first_text = self.enabled_txt
        else:
            first_text = self.disabled_txt

        first_text = self._format_first_text(first_text)

        self._lines = [first_text, "", "", ""]
        self._lines[self.brightness_idx] = self._format_brightness_text()
        self._lines[self.temperature_idx] = self._format_temp_text()
        self._lines[self.gamma_idx] = self._format_gamma_text()

        Set the list of formatted text items to scroll through.
        
libqtile/widget/redshift.py