* @since 3.4.0

	 * @since 3.4.0

	 * @since 3.4.0

	 * @var bool

	 * Methods and properties dealing with managing widgets in the Customizer.

	 *

	 * @since 3.9.0

	/**

	 * Methods and properties dealing with managing nav menus in the Customizer.

	 *

	 * @since 4.3.0

	 * @var WP_Customize_Nav_Menus

	 */

	public $nav_menus;

	/**

	 * Methods and properties dealing with selective refresh in the Customizer preview.

	 *

	 * @since 4.5.0

	 * @var WP_Customize_Selective_Refresh

	 */

	public $selective_refresh;

	/**

	 * Registered instances of WP_Customize_Setting.

	 *

	 * @since 3.4.0

	 * @var array

	 */

	protected $settings = array();

	/**

	 * Sorted top-level instances of WP_Customize_Panel and WP_Customize_Section.

	 *

	 * @since 4.0.0

	 * @var array

	 */

	/**

	 * Registered instances of WP_Customize_Panel.

	 *

	 * @since 4.0.0

	 * @var array

	 */

	protected $panels = array();

	 * List of core components.

	 *

	 * @since 4.5.0

	 * @var array

	 */

	protected $components = array( 'widgets', 'nav_menus' );

	/**

	 * Registered instances of WP_Customize_Section.

	 *

	 * @since 3.4.0

	 * @var array

	 */

	protected $sections = array();

	/**

	 * Registered instances of WP_Customize_Control.

	 *

	 * @since 3.4.0

	 * @var array

	 */

	protected $controls = array();

	/**

	 * Panel types that may be rendered from JS templates.

	 *

	 * @since 4.3.0

	 * @var array

	 */

	protected $registered_panel_types = array();

	/**

	 * Section types that may be rendered from JS templates.

	 *

	 * @since 4.3.0

	 * @var array

	 */

	protected $registered_section_types = array();

	/**

	 * Control types that may be rendered from JS templates.

	 * Initial URL being previewed.

	 *

	 * @since 4.4.0

	 * @var string

	 */

	protected $preview_url;

	/**

	 * URL to link the user to when closing the Customizer.

	 *

	 * @since 4.4.0

	 * @var string

	 */

	protected $return_url;

	/**

	 * Mapping of 'panel', 'section', 'control' to the ID which should be autofocused.

	 *

	 * @since 4.4.0

	 * @var array

	 */

	protected $autofocus = array();

	/**

	 * Messenger channel.

	 *

	 * @since 4.7.0

	 * @var string

	 */

	protected $messenger_channel;

	/**

	 * Whether the autosave revision of the changeset should be loaded.

	 *

	 * @since 4.9.0

	 * @var bool

	 */

	protected $autosaved = false;

	/**

	 * Whether the changeset branching is allowed.

	 *

	 * @since 4.9.0

	 * @var bool

	 */

	protected $branching = true;

	/**

	 * Whether settings should be previewed.

	 *

	 * @since 4.9.0

	 * @var bool

	 */

	protected $settings_previewed = true;

	/**

	 * Whether a starter content changeset was saved.

	 *

	 * @since 4.9.0

	 * @var bool

	 */

	protected $saved_starter_content_changeset = false;

	/**

	 * Changeset UUID.

	 *

	 * @since 4.7.0

	 * @var string

	 */

	private $_changeset_uuid;

	/**

	 * Changeset post ID.

	 *

	 * @since 4.7.0

	 * @var int|false

	 */

	private $_changeset_post_id;

	/**

	 * Changeset data loaded from a customize_changeset post.

	 *

	 * @since 4.7.0

	 * @var array

	 */

	private $_changeset_data;

	/**

	 * @since 4.7.0 Added $args param.

	 *

	 * @param array $args {

	 *     Args.

	 *

	 *     @type null|string|false $changeset_uuid     Changeset UUID, the `post_name` for the customize_changeset post containing the customized state.

	 *                                                 Defaults to `null` resulting in a UUID to be immediately generated. If `false` is provided, then

	 *                                                 then the changeset UUID will be determined during `after_setup_theme`: when the

	 *                                                 `customize_changeset_branching` filter returns false, then the default UUID will be that

	 *                                                 of the most recent `customize_changeset` post that has a status other than 'auto-draft',

	 *                                                 'publish', or 'trash'. Otherwise, if changeset branching is enabled, then a random UUID will be used.

	 *     @type string            $theme              Theme to be previewed (for theme switch). Defaults to customize_theme or theme query params.

	 *     @type string            $messenger_channel  Messenger channel. Defaults to customize_messenger_channel query param.

	 *     @type bool              $settings_previewed If settings should be previewed. Defaults to true.

	 *     @type bool              $branching          If changeset branching is allowed; otherwise, changesets are linear. Defaults to true.

	 *     @type bool              $autosaved          If data from a changeset's autosaved revision should be loaded if it exists. Defaults to false.

	 * }

	public function __construct( $args = array() ) {

		$args = array_merge(

			array_fill_keys( array( 'changeset_uuid', 'theme', 'messenger_channel', 'settings_previewed', 'autosaved', 'branching' ), null ),

			$args

		);

		// Note that the UUID format will be validated in the setup_theme() method.

		if ( ! isset( $args['changeset_uuid'] ) ) {

			$args['changeset_uuid'] = wp_generate_uuid4();

		}

		// The theme and messenger_channel should be supplied via $args, but they are also looked at in the $_REQUEST global here for back-compat.

		if ( ! isset( $args['theme'] ) ) {

			if ( isset( $_REQUEST['customize_theme'] ) ) {

				$args['theme'] = wp_unslash( $_REQUEST['customize_theme'] );

			} elseif ( isset( $_REQUEST['theme'] ) ) { // Deprecated.

				$args['theme'] = wp_unslash( $_REQUEST['theme'] );

			}

		}

		if ( ! isset( $args['messenger_channel'] ) && isset( $_REQUEST['customize_messenger_channel'] ) ) {

			$args['messenger_channel'] = sanitize_key( wp_unslash( $_REQUEST['customize_messenger_channel'] ) );

		}

		$this->original_stylesheet = get_stylesheet();

		$this->theme = wp_get_theme( 0 === validate_file( $args['theme'] ) ? $args['theme'] : null );

		$this->messenger_channel = $args['messenger_channel'];

		$this->_changeset_uuid = $args['changeset_uuid'];

		foreach ( array( 'settings_previewed', 'autosaved', 'branching' ) as $key ) {

			if ( isset( $args[ $key ] ) ) {

				$this->$key = (bool) $args[ $key ];

			}

		}

		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-color-control.php' );

		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-media-control.php' );

		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-upload-control.php' );

		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-image-control.php' );

		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-background-image-control.php' );

		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-background-position-control.php' );

		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-cropped-image-control.php' );

		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-site-icon-control.php' );

		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-header-image-control.php' );

		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-theme-control.php' );

		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-code-editor-control.php' );

		require_once( ABSPATH . WPINC . '/customize/class-wp-widget-area-customize-control.php' );

		require_once( ABSPATH . WPINC . '/customize/class-wp-widget-form-customize-control.php' );

		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-control.php' );

		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-item-control.php' );

		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-location-control.php' );

		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-name-control.php' );

		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-locations-control.php' );

		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-auto-add-control.php' );

		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-new-menu-control.php' ); // @todo Remove in 5.0. See #42364.

		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-nav-menus-panel.php' );

		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-themes-panel.php' );

		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-themes-section.php' );

		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-sidebar-section.php' );

		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-section.php' );

		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-new-menu-section.php' ); // @todo Remove in 5.0. See #42364.

		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-custom-css-setting.php' );

		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-filter-setting.php' );

		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-header-image-setting.php' );

		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-background-image-setting.php' );

		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-item-setting.php' );

		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-setting.php' );

		/**

		 * Filters the core Customizer components to load.

		 *

		 * This allows Core components to be excluded from being instantiated by

		 * filtering them out of the array. Note that this filter generally runs

		 * during the {@see 'plugins_loaded'} action, so it cannot be added

		 * in a theme.

		 *

		 * @since 4.4.0

		 *

		 * @see WP_Customize_Manager::__construct()

		 *

		 * @param array                $components List of core components to load.

		 * @param WP_Customize_Manager $this       WP_Customize_Manager instance.

		 */

		$components = apply_filters( 'customize_loaded_components', $this->components, $this );

		require_once( ABSPATH . WPINC . '/customize/class-wp-customize-selective-refresh.php' );

		$this->selective_refresh = new WP_Customize_Selective_Refresh( $this );

		if ( in_array( 'widgets', $components, true ) ) {

			require_once( ABSPATH . WPINC . '/class-wp-customize-widgets.php' );

			$this->widgets = new WP_Customize_Widgets( $this );

		}

		if ( in_array( 'nav_menus', $components, true ) ) {

			require_once( ABSPATH . WPINC . '/class-wp-customize-nav-menus.php' );

			$this->nav_menus = new WP_Customize_Nav_Menus( $this );

		}

		add_action( 'wp_ajax_customize_save',                     array( $this, 'save' ) );

		add_action( 'wp_ajax_customize_trash',                    array( $this, 'handle_changeset_trash_request' ) );

		add_action( 'wp_ajax_customize_refresh_nonces',           array( $this, 'refresh_nonces' ) );

		add_action( 'wp_ajax_customize_load_themes',              array( $this, 'handle_load_themes_request' ) );

		add_filter( 'heartbeat_settings',                         array( $this, 'add_customize_screen_to_heartbeat_settings' ) );

		add_filter( 'heartbeat_received',                         array( $this, 'check_changeset_lock_with_heartbeat' ), 10, 3 );

		add_action( 'wp_ajax_customize_override_changeset_lock',  array( $this, 'handle_override_changeset_lock_request' ) );

		add_action( 'wp_ajax_customize_dismiss_autosave_or_lock', array( $this, 'handle_dismiss_autosave_or_lock_request' ) );

		// Render Common, Panel, Section, and Control templates.

		add_action( 'customize_controls_print_footer_scripts', array( $this, 'render_panel_templates' ), 1 );

		add_action( 'customize_controls_print_footer_scripts', array( $this, 'render_section_templates' ), 1 );

		add_action( 'customize_controls_print_footer_scripts', array( $this, 'render_control_templates' ), 1 );

		// Export header video settings with the partial response.

		add_filter( 'customize_render_partials_response', array( $this, 'export_header_video_settings' ), 10, 3 );

		// Export the settings to JS via the _wpCustomizeSettings variable.

		add_action( 'customize_controls_print_footer_scripts', array( $this, 'customize_pane_settings' ), 1000 );

		// Add theme update notices.

		if ( current_user_can( 'install_themes' ) || current_user_can( 'update_themes' ) ) {

			require_once ABSPATH . '/wp-admin/includes/update.php';

			add_action( 'customize_controls_print_footer_scripts', 'wp_print_admin_notice_templates' );

		}

	 * Return true if it's an Ajax request.

	 *

	 * @param string|null $action Whether the supplied Ajax action is being run.

	 * @return bool True if it's an Ajax request, false otherwise.

		if ( ! wp_doing_ajax() ) {

	 * or the Ajax message.

	 * @param mixed $ajax_message Ajax return

		if ( $this->doing_ajax() ) {

			$message = __( 'Something went wrong.' );

		}

		if ( $this->messenger_channel ) {

			ob_start();

			wp_enqueue_scripts();

			wp_print_scripts( array( 'customize-base' ) );

			$settings = array(

				'messengerArgs' => array(

					'channel' => $this->messenger_channel,

					'url' => wp_customize_url(),

				),

				'error' => $ajax_message,

			);

			?>

			<script>

			( function( api, settings ) {

				var preview = new api.Messenger( settings.messengerArgs );

				preview.send( 'iframe-loading-error', settings.error );

			} )( wp.customize, <?php echo wp_json_encode( $settings ) ?> );

			</script>

			<?php

			$message .= ob_get_clean();

	 * Return the Ajax wp_die() handler if it's a customized request.

	 * @deprecated 4.7.0

	 *

	 * @return callable Die handler.

		_deprecated_function( __METHOD__, '4.7.0' );