soderlind/plugin-customizer

<?php
/**
 * Code from https://github.com/xwp/wp-customizer-blank-slate
 *
 * Learn more at: https://make.xwp.co/2016/09/11/resetting-the-customizer-to-a-blank-slate/
 * Copyright (c) 2016 XWP (https://make.xwp.co/)
 */
namespace PluginCustomizer;

if ( ! class_exists( 'PluginCustomizer\Blank_Slate' ) ) {
    class Blank_Slate {

        private $slug;
        private $plugin_url;
        private $plugin_root;

        /**
         * Singleton from: from http://stackoverflow.com/a/15870364/1434155
         */
        private static $instances = array();
        protected function __construct() {}
        protected function __clone() {}
        public function __wakeup() {
            throw new Exception( 'Cannot unserialize singleton' );
        }

        public static function instance() {
            $class = get_called_class(); // late-static-bound class name
            if ( ! isset( self::$instances[ $class ] ) ) {
                self::$instances[ $class ] = new static();
            }
            return self::$instances[ $class ];
        }

        function init( $slug = '', $plugin_url, $plugin_root ) {
            // self::$param_name = sanitize_title( get_called_class() , 'plugin_customizer' );
            if ( '' == $slug ) {
                wp_die( 'slug missing', $title = 'BlankSlate::init' );
            }
            $this->slug = $slug;
            $this->plugin_url = $plugin_url;
            $this->plugin_root = $plugin_root;
            add_filter( 'customize_loaded_components', function() {

                $priority = 1;
                add_action( 'wp_loaded', function() {

                    global $wp_customize;
                    remove_all_actions( 'customize_register' );
                    $wp_customize->register_panel_type( 'WP_Customize_Panel' );
                    $wp_customize->register_section_type( 'WP_Customize_Section' );
                    $wp_customize->register_section_type( 'WP_Customize_Sidebar_Section' );
                    $wp_customize->register_control_type( 'WP_Customize_Color_Control' );
                    $wp_customize->register_control_type( 'WP_Customize_Media_Control' );
                    $wp_customize->register_control_type( 'WP_Customize_Upload_Control' );
                    $wp_customize->register_control_type( 'WP_Customize_Image_Control' );
                    $wp_customize->register_control_type( 'WP_Customize_Background_Image_Control' );
                    $wp_customize->register_control_type( 'WP_Customize_Cropped_Image_Control' );
                    $wp_customize->register_control_type( 'WP_Customize_Site_Icon_Control' );
                    $wp_customize->register_control_type( 'WP_Customize_Theme_Control' );
                }, $priority );
                $components = array();

                return $components;
            } );
            add_action( 'customize_controls_init', function() {
                global $wp_customize;
                $wp_customize->set_preview_url(
                    add_query_arg(
                        array( $this->slug => 'on' ),
                        $wp_customize->get_preview_url()
                    )
                );
            } );

            add_action( 'customize_controls_enqueue_scripts', function() {
                $handle = 'plugin-customizer-blank-slate';
                $src = $this->plugin_url . 'assets/js/plugin-customizer-blank-slate.js';
                $deps = array( 'customize-controls' );
                $ver = false;
                $in_footer = true;
                wp_enqueue_script( $handle, $src, $deps, $ver, $in_footer );

                $args = array(
                    'queryParamName' => $this->slug,
                    'queryParamValue' => 'on',
                );
                wp_add_inline_script(
                    $handle,
                    sprintf( 'PluginCustomizerBlankSlate.init( %s );', wp_json_encode( $args ) ),
                    'after'
                );
            } );
        }
    }
}