WP_Customize_Custom_CSS_Setting

19final class WP_Customize_Custom_CSS_Setting extends WP_Customize_Setting {20 21	/**22	 * The setting type.23	 *24	 * @since 4.7.025	 * @var string26	 */27	public $type = 'custom_css';28 29	/**30	 * Setting Transport31	 *32	 * @since 4.7.033	 * @var string34	 */35	public $transport = 'postMessage';36 37	/**38	 * Capability required to edit this setting.39	 *40	 * @since 4.7.041	 * @var string42	 */43	public $capability = 'edit_css';44 45	/**46	 * Stylesheet47	 *48	 * @since 4.7.049	 * @var string50	 */51	public $stylesheet = '';52 53	/**54	 * WP_Customize_Custom_CSS_Setting constructor.55	 *56	 * @since 4.7.057	 *58	 * @throws Exception If the setting ID does not match the pattern `custom_css[$stylesheet]`.59	 *60	 * @param WP_Customize_Manager $manager Customizer bootstrap instance.61	 * @param string               $id      A specific ID of the setting.62	 *                                      Can be a theme mod or option name.63	 * @param array                $args    Setting arguments.64	 */65	public function __construct( $manager, $id, $args = array() ) {66		parent::__construct( $manager, $id, $args );67		if ( 'custom_css' !== $this->id_data['base'] ) {68			throw new Exception( 'Expected custom_css id_base.' );69		}70		if ( 1 !== count( $this->id_data['keys'] ) || empty( $this->id_data['keys'][0] ) ) {71			throw new Exception( 'Expected single stylesheet key.' );72		}73		$this->stylesheet = $this->id_data['keys'][0];74	}75 76	/**77	 * Add filter to preview post value.78	 *79	 * @since 4.7.980	 *81	 * @return bool False when preview short-circuits due no change needing to be previewed.82	 */83	public function preview() {84		if ( $this->is_previewed ) {85			return false;86		}87		$this->is_previewed = true;88		add_filter( 'wp_get_custom_css', array( $this, 'filter_previewed_wp_get_custom_css' ), 9, 2 );89		return true;90	}91 92	/**93	 * Filters `wp_get_custom_css` for applying the customized value.94	 *95	 * This is used in the preview when `wp_get_custom_css()` is called for rendering the styles.96	 *97	 * @since 4.7.098	 *