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<?php |
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/** |
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* Handles the CSS-variables of fields. |
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* |
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* @package Kirki |
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* @category Modules |
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* @author Aristeides Stathopoulos |
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* @copyright Copyright (c) 2017, Aristeides Stathopoulos |
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* @license https://opensource.org/licenses/MIT |
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* @since 3.0.28 |
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*/ |
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/** |
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* The Kirki_Modules_CSS_Vars object. |
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* |
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* @since 3.0.28 |
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*/ |
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class Kirki_Modules_CSS_Vars { |
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/** |
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* The object instance. |
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* |
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* @static |
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* @access private |
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* @since 3.0.28 |
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* @var object |
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*/ |
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private static $instance; |
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/** |
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* Fields with variables. |
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* |
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* @access private |
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* @since 3.0.28 |
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* @var array |
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*/ |
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private $fields = array(); |
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/** |
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* CSS-variables array [var=>val]. |
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* |
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* @access private |
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* @since 3.0.35 |
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* @var array |
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*/ |
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private $vars = array(); |
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/** |
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* Constructor |
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* |
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* @access protected |
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* @since 3.0.28 |
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*/ |
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protected function __construct() { |
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add_action( 'wp', array( $this, 'populate_vars' ) ); |
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add_action( 'wp_head', array( $this, 'the_style' ), 999 ); |
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add_action( 'admin_head', array( $this, 'the_style' ), 999 ); |
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add_action( 'customize_preview_init', array( $this, 'postmessage' ) ); |
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} |
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/** |
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* Gets an instance of this object. |
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* Prevents duplicate instances which avoid artefacts and improves performance. |
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* |
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* @static |
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* @access public |
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* @since 3.0.28 |
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* @return object |
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*/ |
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public static function get_instance() { |
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if ( ! self::$instance ) { |
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self::$instance = new self(); |
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} |
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return self::$instance; |
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} |
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/** |
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* Populates the $vars property of this object. |
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* |
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* @access public |
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* @since 3.0.35 |
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* @return void |
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*/ |
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public function populate_vars() { |
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// Get an array of all fields. |
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$fields = Kirki::$fields; |
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foreach ( $fields as $id => $args ) { |
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if ( ! isset( $args['css_vars'] ) || empty( $args['css_vars'] ) ) { |
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continue; |
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} |
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$val = Kirki_Values::get_value( $args['kirki_config'], $id ); |
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foreach ( $args['css_vars'] as $css_var ) { |
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if ( isset( $css_var[2] ) && is_array( $val ) && isset( $val[ $css_var[2] ] ) ) { |
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$this->vars[ $css_var[0] ] = str_replace( '$', $val[ $css_var[2] ], $css_var[1] ); |
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} else { |
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$this->vars[ $css_var[0] ] = str_replace( '$', $val, $css_var[1] ); |
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} |
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} |
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} |
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} |
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/** |
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* Add styles in <head>. |
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* |
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* @access public |
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* @since 3.0.28 |
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* @return void |
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*/ |
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public function the_style() { |
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if ( empty( $this->vars ) ) { |
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return; |
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} |
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echo '<style id="kirki-css-vars">'; |
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echo ':root{'; |
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foreach ( $this->vars as $var => $val ) { |
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echo esc_html( $var ) . ':' . esc_html( $val ) . ';'; |
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} |
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echo '}'; |
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echo '</style>'; |
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} |
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/** |
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* Get an array of all the variables. |
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* |
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* @access public |
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* @since 3.0.35 |
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* @return array |
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*/ |
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public function get_vars() { |
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return $this->vars; |
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} |
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/** |
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* Enqueues the script that handles postMessage |
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* and adds variables to it using the wp_localize_script function. |
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* The rest is handled via JS. |
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* |
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* @access public |
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* @since 3.0.28 |
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* @return void |
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*/ |
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public function postmessage() { |
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wp_enqueue_script( 'kirki_auto_css_vars', trailingslashit( Kirki::$url ) . 'modules/css-vars/script.js', array( 'jquery', 'customize-preview' ), KIRKI_VERSION, true ); |
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$fields = Kirki::$fields; |
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$data = array(); |
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foreach ( $fields as $field ) { |
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if ( isset( $field['transport'] ) && 'postMessage' === $field['transport'] && isset( $field['css_vars'] ) && ! empty( $field['css_vars'] ) ) { |
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$data[] = $field; |
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} |
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} |
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wp_localize_script( 'kirki_auto_css_vars', 'kirkiCssVarFields', $data ); |
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} |
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} |
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aristath /
kirki
