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<?php
/**
* Handles the CSS Output of fields.
*
* @package Kirki
* @category Modules
* @author Aristeides Stathopoulos
* @copyright Copyright (c) 2017, Aristeides Stathopoulos
* @license http://opensource.org/licenses/https://opensource.org/licenses/MIT
* @since 3.0.0
*/
/**
* The Kirki_Modules_CSS object.
*/
class Kirki_Modules_CSS {
/**
* The object instance.
*
* @static
* @access private
* @since 3.0.0
* @var object
*/
private static $instance;
/**
* Whether we've already processed this or not.
*
* @access public
* @var bool
*/
public $processed = false;
/**
* The CSS array
*
* @access public
* @var array
*/
public static $css_array = array();
/**
* Set to true if you want to use the AJAX method.
*
* @access public
* @var bool
*/
public static $ajax = false;
/**
* The Kirki_CSS_To_File object.
*
* @access protected
* @since 3.0.0
* @var object
*/
protected $css_to_file;
/**
* Constructor
*
* @access protected
*/
protected function __construct() {
$class_files = array(
'Kirki_CSS_To_File' => '/class-kirki-css-to-file.php',
'Kirki_Modules_CSS_Generator' => '/class-kirki-modules-css-generator.php',
'Kirki_Output' => '/class-kirki-output.php',
'Kirki_Output_Field_Background' => '/field/class-kirki-output-field-background.php',
'Kirki_Output_Field_Image' => '/field/class-kirki-output-field-image.php',
'Kirki_Output_Field_Multicolor' => '/field/class-kirki-output-field-multicolor.php',
'Kirki_Output_Field_Dimensions' => '/field/class-kirki-output-field-dimensions.php',
'Kirki_Output_Field_Typography' => '/field/class-kirki-output-field-typography.php',
'Kirki_Output_Property' => '/property/class-kirki-output-property.php',
'Kirki_Output_Property_Background_Image' => '/property/class-kirki-output-property-background-image.php',
'Kirki_Output_Property_Background_Position' => '/property/class-kirki-output-property-background-position.php',
'Kirki_Output_Property_Font_Family' => '/property/class-kirki-output-property-font-family.php',
);
foreach ( $class_files as $class_name => $file ) {
if ( ! class_exists( $class_name ) ) {
include_once wp_normalize_path( dirname( __FILE__ ) . $file );
}
}
add_action( 'init', array( $this, 'init' ) );
}
/**
* Gets an instance of this object.
* Prevents duplicate instances which avoid artefacts and improves performance.
*
* @static
* @access public
* @since 3.0.0
* @return object
*/
public static function get_instance() {
if ( ! self::$instance ) {
self::$instance = new self();
}
return self::$instance;
}
/**
* Init.
*
* @access public
*/
public function init() {
Kirki_Modules_Webfonts::get_instance();
global $wp_customize;
$config = apply_filters( 'kirki/config', array() );
$priority = 999;
if ( isset( $config['styles_priority'] ) ) {
$priority = absint( $config['styles_priority'] );
}
// Allow completely disabling Kirki CSS output.
if ( ( defined( 'KIRKI_NO_OUTPUT' ) && true === KIRKI_NO_OUTPUT ) || ( isset( $config['disable_output'] ) && true === $config['disable_output'] ) ) {
return;
}
$method = apply_filters( 'kirki/dynamic_css/method', 'inline' );
if ( $wp_customize ) {
// If we're in the customizer, load inline no matter what.
add_action( 'wp_enqueue_scripts', array( $this, 'inline_dynamic_css' ), $priority );
// If we're using file method, on save write the new styles.
if ( 'file' === $method ) {
$this->css_to_file = new Kirki_CSS_To_File();
add_action( 'customize_save_after', array( $this->css_to_file, 'write_file' ) );
}
return;
}
if ( 'file' === $method ) {
// Attempt to write the CSS to file.
$this->css_to_file = new Kirki_CSS_To_File();
// If we succesd, load this file.
$failed = get_transient( 'kirki_css_write_to_file_failed' );
// If writing CSS to file hasn't failed, just enqueue this file.
if ( ! $failed ) {
add_action( 'wp_enqueue_scripts', array( $this, 'enqueue_compiled_file' ), $priority );
return;
}
}
// If we are in the customizer, load CSS using inline-styles.
// If we are in the frontend AND self::$ajax is true, then load dynamic CSS using AJAX.
if ( ( true === self::$ajax ) || ( isset( $config['inline_css'] ) && false === $config['inline_css'] ) ) {
add_action( 'wp_enqueue_scripts', array( $this, 'frontend_styles' ), $priority );
add_action( 'wp_ajax_kirki_dynamic_css', array( $this, 'ajax_dynamic_css' ) );
add_action( 'wp_ajax_nopriv_kirki_dynamic_css', array( $this, 'ajax_dynamic_css' ) );
return;
}
// If we got this far then add styles inline.
add_action( 'wp_enqueue_scripts', array( $this, 'inline_dynamic_css' ), $priority );
}
/**
* Enqueues compiled CSS file.
*
* @access public
* @since 3.0.0
*/
public function enqueue_compiled_file() {
wp_enqueue_style( 'kirki-styles', $this->css_to_file->get_url(), array(), $this->css_to_file->get_timestamp() );
}
/**
* Adds inline styles.
*
* @access public
*/
public function inline_dynamic_css() {
$configs = Kirki::$config;
if ( ! $this->processed ) {
foreach ( $configs as $config_id => $args ) {
if ( isset( $args['disable_output'] ) && true === $args['disable_output'] ) {
continue;
}
$styles = self::loop_controls( $config_id );
$styles = apply_filters( "kirki/{$config_id}/dynamic_css", $styles );
if ( ! empty( $styles ) ) {
wp_enqueue_style( 'kirki-styles-' . $config_id, trailingslashit( Kirki::$url ) . 'assets/css/kirki-styles.css', array(), KIRKI_VERSION );
wp_add_inline_style( 'kirki-styles-' . $config_id, $styles );
}
}
$this->processed = true;
}
}
/**
* Get the dynamic-css.php file
*
* @access public
*/
public function ajax_dynamic_css() {
require wp_normalize_path( Kirki::$path . '/modules/css/dynamic-css.php' );
exit;
}
/**
* Enqueues the ajax stylesheet.
*
* @access public
*/
public function frontend_styles() {
wp_enqueue_style( 'kirki-styles-php', admin_url( 'admin-ajax.php' ) . '?action=kirki_dynamic_css', array(), KIRKI_VERSION );
}
/**
* Loop through all fields and create an array of style definitions.
*
* @static
* @access public
* @param string $config_id The configuration ID.
*/
public static function loop_controls( $config_id ) {
// Get an instance of the Kirki_Modules_CSS_Generator class.
// This will make sure google fonts and backup fonts are loaded.
Kirki_Modules_CSS_Generator::get_instance();
$fields = Kirki::$fields;
$css = array();
// Early exit if no fields are found.
if ( empty( $fields ) ) {
return;
}
foreach ( $fields as $field ) {
// Only process fields that belong to $config_id.
if ( $config_id !== $field['kirki_config'] ) {
continue;
}
// Only continue if field dependencies are met.
if ( ! empty( $field['required'] ) ) {
$valid = true;
foreach ( $field['required'] as $requirement ) {
if ( isset( $requirement['setting'] ) && isset( $requirement['value'] ) && isset( $requirement['operator'] ) ) {
$controller_value = Kirki_Values::get_value( $config_id, $requirement['setting'] );
if ( ! Kirki_Active_Callback::compare( $controller_value, $requirement['value'], $requirement['operator'] ) ) {
$valid = false;
}
}
}
if ( ! $valid ) {
continue;
}
}
// Only continue if $field['output'] is set.
if ( isset( $field['output'] ) && ! empty( $field['output'] ) ) {
$css = Kirki_Helper::array_replace_recursive( $css, Kirki_Modules_CSS_Generator::css( $field ) );
// Add the globals.
if ( isset( self::$css_array[ $config_id ] ) && ! empty( self::$css_array[ $config_id ] ) ) {
Kirki_Helper::array_replace_recursive( $css, self::$css_array[ $config_id ] );
}
}
}
$css = apply_filters( "kirki/{$config_id}/styles", $css );
if ( is_array( $css ) ) {
return Kirki_Modules_CSS_Generator::styles_parse( Kirki_Modules_CSS_Generator::add_prefixes( $css ) );
}
}
}