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✏️ Editing: class-kirki-modules-loading.php

<?php
/**
 * Adds a custom loading icon when the previewer refreshes.
 *
 * @package     Kirki
 * @subpackage  Modules
 * @copyright   Copyright (c) 2020, David Vongries
 * @license     https://opensource.org/licenses/MIT
 * @since       3.0.0
 */

/**
 * Modifies the loading overlay.
 */
class Kirki_Modules_Loading {

/**
	 * The object instance.
	 *
	 * @static
	 * @access private
	 * @since 3.0.0
	 * @var object
	 */
	private static $instance;

/**
	 * Constructor.
	 *
	 * @access protected
	 */
	protected function __construct() {
		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;
	}

/**
	 * Runs on init.
	 *
	 * @access public
	 * @since 3.0.0
	 */
	public function init() {
		global $wp_customize;
		if ( ! $wp_customize ) {
			return;
		}
		// Allow disabling the custom loader using the kirki_config filter.
		$config = apply_filters( 'kirki_config', array() );
		if ( isset( $config['disable_loader'] ) && true === $config['disable_loader'] ) {
			return;
		}
		// Add the "loading" icon.
		add_action( 'wp_footer', array( $this, 'add_loader_to_footer' ) );
		add_action( 'wp_head', array( $this, 'add_loader_styles_to_header' ), 99 );
		$this->remove_default_loading_styles();
	}

/**
	 * Adds a custom "loading" div $ its styles when changes are made to the customizer.
	 *
	 * @access public
	 */
	public function add_loader_to_footer() {
		?>
		<div class="kirki-customizer-loading-wrapper">
			<span class="kirki-customizer-loading"></span>
		</div>
		<?php
	}

/**
	 * Adds the loader CSS to our `<head>`.
	 *
	 * @access public
	 */
	public function add_loader_styles_to_header() {
		?>
		<style>
			body.wp-customizer-unloading {
				opacity: 1;
				cursor: progress !important;
				-webkit-transition: none;
				transition: none;
			}
			body.wp-customizer-unloading * {
				pointer-events: none !important;
			}
			.kirki-customizer-loading-wrapper {
				width: 100%;
				height: 100%;
				position: fixed;
				top: 0;
				left: 0;
				background: rgba(255,255,255,0.83);
				z-index: 999999;
				display: none;
				opacity: 0;
				-webkit-transition: opacity 0.5s;
				transition: opacity 0.5s;
				background-image: url("<?php echo esc_url_raw( Kirki::$url ); ?>/assets/images/kirki-logo.svg");
				background-repeat: no-repeat;
				background-position: center center;
			}
			body.wp-customizer-unloading .kirki-customizer-loading-wrapper {
				display: block;
				opacity: 1;
			}
			.kirki-customizer-loading-wrapper .kirki-customizer-loading {
				position: absolute;
				width: 60px;
				height: 60px;
				top: 50%;
				left: 50%;
				margin: -30px;
				background-color: rgba(0,0,0,.83);
				border-radius: 100%;
				-webkit-animation: sk-scaleout 1.0s infinite ease-in-out;
				animation: sk-scaleout 1.0s infinite ease-in-out;
			}
			@-webkit-keyframes sk-scaleout {
				0% { -webkit-transform: scale(0) }
				100% {
					-webkit-transform: scale(1.0);
					opacity: 0;
				}
			}
			@keyframes sk-scaleout {
				0% {
					-webkit-transform: scale(0);
					transform: scale(0);
				}
				100% {
					-webkit-transform: scale(1.0);
					transform: scale(1.0);
					opacity: 0;
				}
			}
		</style>
		<?php
	}

/**
	 * Removes the default loader styles from WP Core.
	 *
	 * @access public
	 */
	public function remove_default_loading_styles() {
		global $wp_customize;
		remove_action( 'wp_head', array( $wp_customize, 'customize_preview_loading_style' ) );
	}
}

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