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/wp-includes/ -> class-wp-customize-widgets.php (source)

   1  <?php
   2  /**
   3   * WordPress Customize Widgets classes
   4   *
   5   * @package WordPress
   6   * @subpackage Customize
   7   * @since 3.9.0
   8   */
   9  
  10  /**
  11   * Customize Widgets class.
  12   *
  13   * Implements widget management in the Customizer.
  14   *
  15   * @since 3.9.0
  16   *
  17   * @see WP_Customize_Manager
  18   */
  19  final class WP_Customize_Widgets {
  20  
  21      /**
  22       * WP_Customize_Manager instance.
  23       *
  24       * @since 3.9.0
  25       * @var WP_Customize_Manager
  26       */
  27      public $manager;
  28  
  29      /**
  30       * All id_bases for widgets defined in core.
  31       *
  32       * @since 3.9.0
  33       * @var array
  34       */
  35      protected $core_widget_id_bases = array(
  36          'archives',
  37          'calendar',
  38          'categories',
  39          'custom_html',
  40          'links',
  41          'media_audio',
  42          'media_image',
  43          'media_video',
  44          'meta',
  45          'nav_menu',
  46          'pages',
  47          'recent-comments',
  48          'recent-posts',
  49          'rss',
  50          'search',
  51          'tag_cloud',
  52          'text',
  53      );
  54  
  55      /**
  56       * @since 3.9.0
  57       * @var array
  58       */
  59      protected $rendered_sidebars = array();
  60  
  61      /**
  62       * @since 3.9.0
  63       * @var array
  64       */
  65      protected $rendered_widgets = array();
  66  
  67      /**
  68       * @since 3.9.0
  69       * @var array
  70       */
  71      protected $old_sidebars_widgets = array();
  72  
  73      /**
  74       * Mapping of widget ID base to whether it supports selective refresh.
  75       *
  76       * @since 4.5.0
  77       * @var array
  78       */
  79      protected $selective_refreshable_widgets;
  80  
  81      /**
  82       * Mapping of setting type to setting ID pattern.
  83       *
  84       * @since 4.2.0
  85       * @var array
  86       */
  87      protected $setting_id_patterns = array(
  88          'widget_instance' => '/^widget_(?P<id_base>.+?)(?:\[(?P<widget_number>\d+)\])?$/',
  89          'sidebar_widgets' => '/^sidebars_widgets\[(?P<sidebar_id>.+?)\]$/',
  90      );
  91  
  92      /**
  93       * Initial loader.
  94       *
  95       * @since 3.9.0
  96       *
  97       * @param WP_Customize_Manager $manager Customize manager bootstrap instance.
  98       */
  99  	public function __construct( $manager ) {
 100          $this->manager = $manager;
 101  
 102          // See https://github.com/xwp/wp-customize-snapshots/blob/962586659688a5b1fd9ae93618b7ce2d4e7a421c/php/class-customize-snapshot-manager.php#L420-L449
 103          add_filter( 'customize_dynamic_setting_args', array( $this, 'filter_customize_dynamic_setting_args' ), 10, 2 );
 104          add_action( 'widgets_init', array( $this, 'register_settings' ), 95 );
 105          add_action( 'customize_register', array( $this, 'schedule_customize_register' ), 1 );
 106  
 107          // Skip remaining hooks when the user can't manage widgets anyway.
 108          if ( ! current_user_can( 'edit_theme_options' ) ) {
 109              return;
 110          }
 111  
 112          add_action( 'wp_loaded', array( $this, 'override_sidebars_widgets_for_theme_switch' ) );
 113          add_action( 'customize_controls_init', array( $this, 'customize_controls_init' ) );
 114          add_action( 'customize_controls_enqueue_scripts', array( $this, 'enqueue_scripts' ) );
 115          add_action( 'customize_controls_print_styles', array( $this, 'print_styles' ) );
 116          add_action( 'customize_controls_print_scripts', array( $this, 'print_scripts' ) );
 117          add_action( 'customize_controls_print_footer_scripts', array( $this, 'print_footer_scripts' ) );
 118          add_action( 'customize_controls_print_footer_scripts', array( $this, 'output_widget_control_templates' ) );
 119          add_action( 'customize_preview_init', array( $this, 'customize_preview_init' ) );
 120          add_filter( 'customize_refresh_nonces', array( $this, 'refresh_nonces' ) );
 121  
 122          add_action( 'dynamic_sidebar', array( $this, 'tally_rendered_widgets' ) );
 123          add_filter( 'is_active_sidebar', array( $this, 'tally_sidebars_via_is_active_sidebar_calls' ), 10, 2 );
 124          add_filter( 'dynamic_sidebar_has_widgets', array( $this, 'tally_sidebars_via_dynamic_sidebar_calls' ), 10, 2 );
 125  
 126          // Selective Refresh.
 127          add_filter( 'customize_dynamic_partial_args', array( $this, 'customize_dynamic_partial_args' ), 10, 2 );
 128          add_action( 'customize_preview_init', array( $this, 'selective_refresh_init' ) );
 129      }
 130  
 131      /**
 132       * List whether each registered widget can be use selective refresh.
 133       *
 134       * If the theme does not support the customize-selective-refresh-widgets feature,
 135       * then this will always return an empty array.
 136       *
 137       * @since 4.5.0
 138       *
 139       * @global WP_Widget_Factory $wp_widget_factory
 140       *
 141       * @return array Mapping of id_base to support. If theme doesn't support
 142       *               selective refresh, an empty array is returned.
 143       */
 144  	public function get_selective_refreshable_widgets() {
 145          global $wp_widget_factory;
 146          if ( ! current_theme_supports( 'customize-selective-refresh-widgets' ) ) {
 147              return array();
 148          }
 149          if ( ! isset( $this->selective_refreshable_widgets ) ) {
 150              $this->selective_refreshable_widgets = array();
 151              foreach ( $wp_widget_factory->widgets as $wp_widget ) {
 152                  $this->selective_refreshable_widgets[ $wp_widget->id_base ] = ! empty( $wp_widget->widget_options['customize_selective_refresh'] );
 153              }
 154          }
 155          return $this->selective_refreshable_widgets;
 156      }
 157  
 158      /**
 159       * Determines if a widget supports selective refresh.
 160       *
 161       * @since 4.5.0
 162       *
 163       * @param string $id_base Widget ID Base.
 164       * @return bool Whether the widget can be selective refreshed.
 165       */
 166  	public function is_widget_selective_refreshable( $id_base ) {
 167          $selective_refreshable_widgets = $this->get_selective_refreshable_widgets();
 168          return ! empty( $selective_refreshable_widgets[ $id_base ] );
 169      }
 170  
 171      /**
 172       * Retrieves the widget setting type given a setting ID.
 173       *
 174       * @since 4.2.0
 175       *
 176       * @staticvar array $cache
 177       *
 178       * @param string $setting_id Setting ID.
 179       * @return string|void Setting type.
 180       */
 181  	protected function get_setting_type( $setting_id ) {
 182          static $cache = array();
 183          if ( isset( $cache[ $setting_id ] ) ) {
 184              return $cache[ $setting_id ];
 185          }
 186          foreach ( $this->setting_id_patterns as $type => $pattern ) {
 187              if ( preg_match( $pattern, $setting_id ) ) {
 188                  $cache[ $setting_id ] = $type;
 189                  return $type;
 190              }
 191          }
 192      }
 193  
 194      /**
 195       * Inspects the incoming customized data for any widget settings, and dynamically adds
 196       * them up-front so widgets will be initialized properly.
 197       *
 198       * @since 4.2.0
 199       */
 200  	public function register_settings() {
 201          $widget_setting_ids   = array();
 202          $incoming_setting_ids = array_keys( $this->manager->unsanitized_post_values() );
 203          foreach ( $incoming_setting_ids as $setting_id ) {
 204              if ( ! is_null( $this->get_setting_type( $setting_id ) ) ) {
 205                  $widget_setting_ids[] = $setting_id;
 206              }
 207          }
 208          if ( $this->manager->doing_ajax( 'update-widget' ) && isset( $_REQUEST['widget-id'] ) ) {
 209              $widget_setting_ids[] = $this->get_setting_id( wp_unslash( $_REQUEST['widget-id'] ) );
 210          }
 211  
 212          $settings = $this->manager->add_dynamic_settings( array_unique( $widget_setting_ids ) );
 213  
 214          if ( $this->manager->settings_previewed() ) {
 215              foreach ( $settings as $setting ) {
 216                  $setting->preview();
 217              }
 218          }
 219      }
 220  
 221      /**
 222       * Determines the arguments for a dynamically-created setting.
 223       *
 224       * @since 4.2.0
 225       *
 226       * @param false|array $args       The arguments to the WP_Customize_Setting constructor.
 227       * @param string      $setting_id ID for dynamic setting, usually coming from `$_POST['customized']`.
 228       * @return false|array Setting arguments, false otherwise.
 229       */
 230  	public function filter_customize_dynamic_setting_args( $args, $setting_id ) {
 231          if ( $this->get_setting_type( $setting_id ) ) {
 232              $args = $this->get_setting_args( $setting_id );
 233          }
 234          return $args;
 235      }
 236  
 237      /**
 238       * Retrieves an unslashed post value or return a default.
 239       *
 240       * @since 3.9.0
 241       *
 242       * @param string $name    Post value.
 243       * @param mixed  $default Default post value.
 244       * @return mixed Unslashed post value or default value.
 245       */
 246  	protected function get_post_value( $name, $default = null ) {
 247          if ( ! isset( $_POST[ $name ] ) ) {
 248              return $default;
 249          }
 250  
 251          return wp_unslash( $_POST[ $name ] );
 252      }
 253  
 254      /**
 255       * Override sidebars_widgets for theme switch.
 256       *
 257       * When switching a theme via the Customizer, supply any previously-configured
 258       * sidebars_widgets from the target theme as the initial sidebars_widgets
 259       * setting. Also store the old theme's existing settings so that they can
 260       * be passed along for storing in the sidebars_widgets theme_mod when the
 261       * theme gets switched.
 262       *
 263       * @since 3.9.0
 264       *
 265       * @global array $sidebars_widgets
 266       * @global array $_wp_sidebars_widgets
 267       */
 268  	public function override_sidebars_widgets_for_theme_switch() {
 269          global $sidebars_widgets;
 270  
 271          if ( $this->manager->doing_ajax() || $this->manager->is_theme_active() ) {
 272              return;
 273          }
 274  
 275          $this->old_sidebars_widgets = wp_get_sidebars_widgets();
 276          add_filter( 'customize_value_old_sidebars_widgets_data', array( $this, 'filter_customize_value_old_sidebars_widgets_data' ) );
 277          $this->manager->set_post_value( 'old_sidebars_widgets_data', $this->old_sidebars_widgets ); // Override any value cached in changeset.
 278  
 279          // retrieve_widgets() looks at the global $sidebars_widgets
 280          $sidebars_widgets = $this->old_sidebars_widgets;
 281          $sidebars_widgets = retrieve_widgets( 'customize' );
 282          add_filter( 'option_sidebars_widgets', array( $this, 'filter_option_sidebars_widgets_for_theme_switch' ), 1 );
 283          // reset global cache var used by wp_get_sidebars_widgets()
 284          unset( $GLOBALS['_wp_sidebars_widgets'] );
 285      }
 286  
 287      /**
 288       * Filters old_sidebars_widgets_data Customizer setting.
 289       *
 290       * When switching themes, filter the Customizer setting old_sidebars_widgets_data
 291       * to supply initial $sidebars_widgets before they were overridden by retrieve_widgets().
 292       * The value for old_sidebars_widgets_data gets set in the old theme's sidebars_widgets
 293       * theme_mod.
 294       *
 295       * @since 3.9.0
 296       *
 297       * @see WP_Customize_Widgets::handle_theme_switch()
 298       *
 299       * @param array $old_sidebars_widgets
 300       * @return array
 301       */
 302      public function filter_customize_value_old_sidebars_widgets_data( $old_sidebars_widgets ) {
 303          return $this->old_sidebars_widgets;
 304      }
 305  
 306      /**
 307       * Filters sidebars_widgets option for theme switch.
 308       *
 309       * When switching themes, the retrieve_widgets() function is run when the Customizer initializes,
 310       * and then the new sidebars_widgets here get supplied as the default value for the sidebars_widgets
 311       * option.
 312       *
 313       * @since 3.9.0
 314       *
 315       * @see WP_Customize_Widgets::handle_theme_switch()
 316       * @global array $sidebars_widgets
 317       *
 318       * @param array $sidebars_widgets
 319       * @return array
 320       */
 321      public function filter_option_sidebars_widgets_for_theme_switch( $sidebars_widgets ) {
 322          $sidebars_widgets                  = $GLOBALS['sidebars_widgets'];
 323          $sidebars_widgets['array_version'] = 3;
 324          return $sidebars_widgets;
 325      }
 326  
 327      /**
 328       * Ensures all widgets get loaded into the Customizer.
 329       *
 330       * Note: these actions are also fired in wp_ajax_update_widget().
 331       *
 332       * @since 3.9.0
 333       */
 334  	public function customize_controls_init() {
 335          /** This action is documented in wp-admin/includes/ajax-actions.php */
 336          do_action( 'load-widgets.php' ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
 337  
 338          /** This action is documented in wp-admin/includes/ajax-actions.php */
 339          do_action( 'widgets.php' ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
 340  
 341          /** This action is documented in wp-admin/widgets.php */
 342          do_action( 'sidebar_admin_setup' );
 343      }
 344  
 345      /**
 346       * Ensures widgets are available for all types of previews.
 347       *
 348       * When in preview, hook to {@see 'customize_register'} for settings after WordPress is loaded
 349       * so that all filters have been initialized (e.g. Widget Visibility).
 350       *
 351       * @since 3.9.0
 352       */
 353  	public function schedule_customize_register() {
 354          if ( is_admin() ) {
 355              $this->customize_register();
 356          } else {
 357              add_action( 'wp', array( $this, 'customize_register' ) );
 358          }
 359      }
 360  
 361      /**
 362       * Registers Customizer settings and controls for all sidebars and widgets.
 363       *
 364       * @since 3.9.0
 365       *
 366       * @global array $wp_registered_widgets
 367       * @global array $wp_registered_widget_controls
 368       * @global array $wp_registered_sidebars
 369       */
 370  	public function customize_register() {
 371          global $wp_registered_widgets, $wp_registered_widget_controls, $wp_registered_sidebars;
 372  
 373          add_filter( 'sidebars_widgets', array( $this, 'preview_sidebars_widgets' ), 1 );
 374  
 375          $sidebars_widgets = array_merge(
 376              array( 'wp_inactive_widgets' => array() ),
 377              array_fill_keys( array_keys( $wp_registered_sidebars ), array() ),
 378              wp_get_sidebars_widgets()
 379          );
 380  
 381          $new_setting_ids = array();
 382  
 383          /*
 384           * Register a setting for all widgets, including those which are active,
 385           * inactive, and orphaned since a widget may get suppressed from a sidebar
 386           * via a plugin (like Widget Visibility).
 387           */
 388          foreach ( array_keys( $wp_registered_widgets ) as $widget_id ) {
 389              $setting_id   = $this->get_setting_id( $widget_id );
 390              $setting_args = $this->get_setting_args( $setting_id );
 391              if ( ! $this->manager->get_setting( $setting_id ) ) {
 392                  $this->manager->add_setting( $setting_id, $setting_args );
 393              }
 394              $new_setting_ids[] = $setting_id;
 395          }
 396  
 397          /*
 398           * Add a setting which will be supplied for the theme's sidebars_widgets
 399           * theme_mod when the theme is switched.
 400           */
 401          if ( ! $this->manager->is_theme_active() ) {
 402              $setting_id   = 'old_sidebars_widgets_data';
 403              $setting_args = $this->get_setting_args(
 404                  $setting_id,
 405                  array(
 406                      'type'  => 'global_variable',
 407                      'dirty' => true,
 408                  )
 409              );
 410              $this->manager->add_setting( $setting_id, $setting_args );
 411          }
 412  
 413          $this->manager->add_panel(
 414              'widgets',
 415              array(
 416                  'type'                     => 'widgets',
 417                  'title'                    => __( 'Widgets' ),
 418                  'description'              => __( 'Widgets are independent sections of content that can be placed into widgetized areas provided by your theme (commonly called sidebars).' ),
 419                  'priority'                 => 110,
 420                  'active_callback'          => array( $this, 'is_panel_active' ),
 421                  'auto_expand_sole_section' => true,
 422              )
 423          );
 424  
 425          foreach ( $sidebars_widgets as $sidebar_id => $sidebar_widget_ids ) {
 426              if ( empty( $sidebar_widget_ids ) ) {
 427                  $sidebar_widget_ids = array();
 428              }
 429  
 430              $is_registered_sidebar = is_registered_sidebar( $sidebar_id );
 431              $is_inactive_widgets   = ( 'wp_inactive_widgets' === $sidebar_id );
 432              $is_active_sidebar     = ( $is_registered_sidebar && ! $is_inactive_widgets );
 433  
 434              // Add setting for managing the sidebar's widgets.
 435              if ( $is_registered_sidebar || $is_inactive_widgets ) {
 436                  $setting_id   = sprintf( 'sidebars_widgets[%s]', $sidebar_id );
 437                  $setting_args = $this->get_setting_args( $setting_id );
 438                  if ( ! $this->manager->get_setting( $setting_id ) ) {
 439                      if ( ! $this->manager->is_theme_active() ) {
 440                          $setting_args['dirty'] = true;
 441                      }
 442                      $this->manager->add_setting( $setting_id, $setting_args );
 443                  }
 444                  $new_setting_ids[] = $setting_id;
 445  
 446                  // Add section to contain controls.
 447                  $section_id = sprintf( 'sidebar-widgets-%s', $sidebar_id );
 448                  if ( $is_active_sidebar ) {
 449  
 450                      $section_args = array(
 451                          'title'       => $wp_registered_sidebars[ $sidebar_id ]['name'],
 452                          'description' => $wp_registered_sidebars[ $sidebar_id ]['description'],
 453                          'priority'    => array_search( $sidebar_id, array_keys( $wp_registered_sidebars ) ),
 454                          'panel'       => 'widgets',
 455                          'sidebar_id'  => $sidebar_id,
 456                      );
 457  
 458                      /**
 459                       * Filters Customizer widget section arguments for a given sidebar.
 460                       *
 461                       * @since 3.9.0
 462                       *
 463                       * @param array      $section_args Array of Customizer widget section arguments.
 464                       * @param string     $section_id   Customizer section ID.
 465                       * @param int|string $sidebar_id   Sidebar ID.
 466                       */
 467                      $section_args = apply_filters( 'customizer_widgets_section_args', $section_args, $section_id, $sidebar_id );
 468  
 469                      $section = new WP_Customize_Sidebar_Section( $this->manager, $section_id, $section_args );
 470                      $this->manager->add_section( $section );
 471  
 472                      $control           = new WP_Widget_Area_Customize_Control(
 473                          $this->manager,
 474                          $setting_id,
 475                          array(
 476                              'section'    => $section_id,
 477                              'sidebar_id' => $sidebar_id,
 478                              'priority'   => count( $sidebar_widget_ids ), // place 'Add Widget' and 'Reorder' buttons at end.
 479                          )
 480                      );
 481                      $new_setting_ids[] = $setting_id;
 482  
 483                      $this->manager->add_control( $control );
 484                  }
 485              }
 486  
 487              // Add a control for each active widget (located in a sidebar).
 488              foreach ( $sidebar_widget_ids as $i => $widget_id ) {
 489  
 490                  // Skip widgets that may have gone away due to a plugin being deactivated.
 491                  if ( ! $is_active_sidebar || ! isset( $wp_registered_widgets[ $widget_id ] ) ) {
 492                      continue;
 493                  }
 494  
 495                  $registered_widget = $wp_registered_widgets[ $widget_id ];
 496                  $setting_id        = $this->get_setting_id( $widget_id );
 497                  $id_base           = $wp_registered_widget_controls[ $widget_id ]['id_base'];
 498  
 499                  $control = new WP_Widget_Form_Customize_Control(
 500                      $this->manager,
 501                      $setting_id,
 502                      array(
 503                          'label'          => $registered_widget['name'],
 504                          'section'        => $section_id,
 505                          'sidebar_id'     => $sidebar_id,
 506                          'widget_id'      => $widget_id,
 507                          'widget_id_base' => $id_base,
 508                          'priority'       => $i,
 509                          'width'          => $wp_registered_widget_controls[ $widget_id ]['width'],
 510                          'height'         => $wp_registered_widget_controls[ $widget_id ]['height'],
 511                          'is_wide'        => $this->is_wide_widget( $widget_id ),
 512                      )
 513                  );
 514                  $this->manager->add_control( $control );
 515              }
 516          }
 517  
 518          if ( $this->manager->settings_previewed() ) {
 519              foreach ( $new_setting_ids as $new_setting_id ) {
 520                  $this->manager->get_setting( $new_setting_id )->preview();
 521              }
 522          }
 523      }
 524  
 525      /**
 526       * Determines whether the widgets panel is active, based on whether there are sidebars registered.
 527       *
 528       * @since 4.4.0
 529       *
 530       * @see WP_Customize_Panel::$active_callback
 531       *
 532       * @global array $wp_registered_sidebars
 533       * @return bool Active.
 534       */
 535  	public function is_panel_active() {
 536          global $wp_registered_sidebars;
 537          return ! empty( $wp_registered_sidebars );
 538      }
 539  
 540      /**
 541       * Converts a widget_id into its corresponding Customizer setting ID (option name).
 542       *
 543       * @since 3.9.0
 544       *
 545       * @param string $widget_id Widget ID.
 546       * @return string Maybe-parsed widget ID.
 547       */
 548  	public function get_setting_id( $widget_id ) {
 549          $parsed_widget_id = $this->parse_widget_id( $widget_id );
 550          $setting_id       = sprintf( 'widget_%s', $parsed_widget_id['id_base'] );
 551  
 552          if ( ! is_null( $parsed_widget_id['number'] ) ) {
 553              $setting_id .= sprintf( '[%d]', $parsed_widget_id['number'] );
 554          }
 555          return $setting_id;
 556      }
 557  
 558      /**
 559       * Determines whether the widget is considered "wide".
 560       *
 561       * Core widgets which may have controls wider than 250, but can still be shown
 562       * in the narrow Customizer panel. The RSS and Text widgets in Core, for example,
 563       * have widths of 400 and yet they still render fine in the Customizer panel.
 564       *
 565       * This method will return all Core widgets as being not wide, but this can be
 566       * overridden with the {@see 'is_wide_widget_in_customizer'} filter.
 567       *
 568       * @since 3.9.0
 569       *
 570       * @global $wp_registered_widget_controls
 571       *
 572       * @param string $widget_id Widget ID.
 573       * @return bool Whether or not the widget is a "wide" widget.
 574       */
 575  	public function is_wide_widget( $widget_id ) {
 576          global $wp_registered_widget_controls;
 577  
 578          $parsed_widget_id = $this->parse_widget_id( $widget_id );
 579          $width            = $wp_registered_widget_controls[ $widget_id ]['width'];
 580          $is_core          = in_array( $parsed_widget_id['id_base'], $this->core_widget_id_bases );
 581          $is_wide          = ( $width > 250 && ! $is_core );
 582  
 583          /**
 584           * Filters whether the given widget is considered "wide".
 585           *
 586           * @since 3.9.0
 587           *
 588           * @param bool   $is_wide   Whether the widget is wide, Default false.
 589           * @param string $widget_id Widget ID.
 590           */
 591          return apply_filters( 'is_wide_widget_in_customizer', $is_wide, $widget_id );
 592      }
 593  
 594      /**
 595       * Converts a widget ID into its id_base and number components.
 596       *
 597       * @since 3.9.0
 598       *
 599       * @param string $widget_id Widget ID.
 600       * @return array Array containing a widget's id_base and number components.
 601       */
 602  	public function parse_widget_id( $widget_id ) {
 603          $parsed = array(
 604              'number'  => null,
 605              'id_base' => null,
 606          );
 607  
 608          if ( preg_match( '/^(.+)-(\d+)$/', $widget_id, $matches ) ) {
 609              $parsed['id_base'] = $matches[1];
 610              $parsed['number']  = intval( $matches[2] );
 611          } else {
 612              // likely an old single widget
 613              $parsed['id_base'] = $widget_id;
 614          }
 615          return $parsed;
 616      }
 617  
 618      /**
 619       * Converts a widget setting ID (option path) to its id_base and number components.
 620       *
 621       * @since 3.9.0
 622       *
 623       * @param string $setting_id Widget setting ID.
 624       * @return WP_Error|array Array containing a widget's id_base and number components,
 625       *                        or a WP_Error object.
 626       */
 627  	public function parse_widget_setting_id( $setting_id ) {
 628          if ( ! preg_match( '/^(widget_(.+?))(?:\[(\d+)\])?$/', $setting_id, $matches ) ) {
 629              return new WP_Error( 'widget_setting_invalid_id' );
 630          }
 631  
 632          $id_base = $matches[2];
 633          $number  = isset( $matches[3] ) ? intval( $matches[3] ) : null;
 634  
 635          return compact( 'id_base', 'number' );
 636      }
 637  
 638      /**
 639       * Calls admin_print_styles-widgets.php and admin_print_styles hooks to
 640       * allow custom styles from plugins.
 641       *
 642       * @since 3.9.0
 643       */
 644  	public function print_styles() {
 645          /** This action is documented in wp-admin/admin-header.php */
 646          do_action( 'admin_print_styles-widgets.php' ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
 647  
 648          /** This action is documented in wp-admin/admin-header.php */
 649          do_action( 'admin_print_styles' );
 650      }
 651  
 652      /**
 653       * Calls admin_print_scripts-widgets.php and admin_print_scripts hooks to
 654       * allow custom scripts from plugins.
 655       *
 656       * @since 3.9.0
 657       */
 658  	public function print_scripts() {
 659          /** This action is documented in wp-admin/admin-header.php */
 660          do_action( 'admin_print_scripts-widgets.php' ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
 661  
 662          /** This action is documented in wp-admin/admin-header.php */
 663          do_action( 'admin_print_scripts' );
 664      }
 665  
 666      /**
 667       * Enqueues scripts and styles for Customizer panel and export data to JavaScript.
 668       *
 669       * @since 3.9.0
 670       *
 671       * @global WP_Scripts $wp_scripts
 672       * @global array $wp_registered_sidebars
 673       * @global array $wp_registered_widgets
 674       */
 675  	public function enqueue_scripts() {
 676          global $wp_scripts, $wp_registered_sidebars, $wp_registered_widgets;
 677  
 678          wp_enqueue_style( 'customize-widgets' );
 679          wp_enqueue_script( 'customize-widgets' );
 680  
 681          /** This action is documented in wp-admin/admin-header.php */
 682          do_action( 'admin_enqueue_scripts', 'widgets.php' );
 683  
 684          /*
 685           * Export available widgets with control_tpl removed from model
 686           * since plugins need templates to be in the DOM.
 687           */
 688          $available_widgets = array();
 689  
 690          foreach ( $this->get_available_widgets() as $available_widget ) {
 691              unset( $available_widget['control_tpl'] );
 692              $available_widgets[] = $available_widget;
 693          }
 694  
 695          $widget_reorder_nav_tpl = sprintf(
 696              '<div class="widget-reorder-nav"><span class="move-widget" tabindex="0">%1$s</span><span class="move-widget-down" tabindex="0">%2$s</span><span class="move-widget-up" tabindex="0">%3$s</span></div>',
 697              __( 'Move to another area&hellip;' ),
 698              __( 'Move down' ),
 699              __( 'Move up' )
 700          );
 701  
 702          $move_widget_area_tpl = str_replace(
 703              array( '{description}', '{btn}' ),
 704              array(
 705                  __( 'Select an area to move this widget into:' ),
 706                  _x( 'Move', 'Move widget' ),
 707              ),
 708              '<div class="move-widget-area">
 709                  <p class="description">{description}</p>
 710                  <ul class="widget-area-select">
 711                      <% _.each( sidebars, function ( sidebar ){ %>
 712                          <li class="" data-id="<%- sidebar.id %>" title="<%- sidebar.description %>" tabindex="0"><%- sidebar.name %></li>
 713                      <% }); %>
 714                  </ul>
 715                  <div class="move-widget-actions">
 716                      <button class="move-widget-btn button" type="button">{btn}</button>
 717                  </div>
 718              </div>'
 719          );
 720  
 721          /*
 722           * Gather all strings in PHP that may be needed by JS on the client.
 723           * Once JS i18n is implemented (in #20491), this can be removed.
 724           */
 725          $some_non_rendered_areas_messages    = array();
 726          $some_non_rendered_areas_messages[1] = html_entity_decode(
 727              __( 'Your theme has 1 other widget area, but this particular page doesn&#8217;t display it.' ),
 728              ENT_QUOTES,
 729              get_bloginfo( 'charset' )
 730          );
 731          $registered_sidebar_count            = count( $wp_registered_sidebars );
 732          for ( $non_rendered_count = 2; $non_rendered_count < $registered_sidebar_count; $non_rendered_count++ ) {
 733              $some_non_rendered_areas_messages[ $non_rendered_count ] = html_entity_decode(
 734                  sprintf(
 735                      /* translators: %s: The number of other widget areas registered but not rendered. */
 736                      _n(
 737                          'Your theme has %s other widget area, but this particular page doesn&#8217;t display it.',
 738                          'Your theme has %s other widget areas, but this particular page doesn&#8217;t display them.',
 739                          $non_rendered_count
 740                      ),
 741                      number_format_i18n( $non_rendered_count )
 742                  ),
 743                  ENT_QUOTES,
 744                  get_bloginfo( 'charset' )
 745              );
 746          }
 747  
 748          if ( 1 === $registered_sidebar_count ) {
 749              $no_areas_shown_message = html_entity_decode(
 750                  sprintf(
 751                      __( 'Your theme has 1 widget area, but this particular page doesn&#8217;t display it.' )
 752                  ),
 753                  ENT_QUOTES,
 754                  get_bloginfo( 'charset' )
 755              );
 756          } else {
 757              $no_areas_shown_message = html_entity_decode(
 758                  sprintf(
 759                      /* translators: %s: The total number of widget areas registered. */
 760                      _n(
 761                          'Your theme has %s widget area, but this particular page doesn&#8217;t display it.',
 762                          'Your theme has %s widget areas, but this particular page doesn&#8217;t display them.',
 763                          $registered_sidebar_count
 764                      ),
 765                      number_format_i18n( $registered_sidebar_count )
 766                  ),
 767                  ENT_QUOTES,
 768                  get_bloginfo( 'charset' )
 769              );
 770          }
 771  
 772          $settings = array(
 773              'registeredSidebars'          => array_values( $wp_registered_sidebars ),
 774              'registeredWidgets'           => $wp_registered_widgets,
 775              'availableWidgets'            => $available_widgets, // @todo Merge this with registered_widgets
 776              'l10n'                        => array(
 777                  'saveBtnLabel'     => __( 'Apply' ),
 778                  'saveBtnTooltip'   => __( 'Save and preview changes before publishing them.' ),
 779                  'removeBtnLabel'   => __( 'Remove' ),
 780                  'removeBtnTooltip' => __( 'Keep widget settings and move it to the inactive widgets' ),
 781                  'error'            => __( 'An error has occurred. Please reload the page and try again.' ),
 782                  'widgetMovedUp'    => __( 'Widget moved up' ),
 783                  'widgetMovedDown'  => __( 'Widget moved down' ),
 784                  'navigatePreview'  => __( 'You can navigate to other pages on your site while using the Customizer to view and edit the widgets displayed on those pages.' ),
 785                  'someAreasShown'   => $some_non_rendered_areas_messages,
 786                  'noAreasShown'     => $no_areas_shown_message,
 787                  'reorderModeOn'    => __( 'Reorder mode enabled' ),
 788                  'reorderModeOff'   => __( 'Reorder mode closed' ),
 789                  'reorderLabelOn'   => esc_attr__( 'Reorder widgets' ),
 790                  /* translators: %d: The number of widgets found. */
 791                  'widgetsFound'     => __( 'Number of widgets found: %d' ),
 792                  'noWidgetsFound'   => __( 'No widgets found.' ),
 793              ),
 794              'tpl'                         => array(
 795                  'widgetReorderNav' => $widget_reorder_nav_tpl,
 796                  'moveWidgetArea'   => $move_widget_area_tpl,
 797              ),
 798              'selectiveRefreshableWidgets' => $this->get_selective_refreshable_widgets(),
 799          );
 800  
 801          foreach ( $settings['registeredWidgets'] as &$registered_widget ) {
 802              unset( $registered_widget['callback'] ); // may not be JSON-serializeable
 803          }
 804  
 805          $wp_scripts->add_data(
 806              'customize-widgets',
 807              'data',
 808              sprintf( 'var _wpCustomizeWidgetsSettings = %s;', wp_json_encode( $settings ) )
 809          );
 810      }
 811  
 812      /**
 813       * Renders the widget form control templates into the DOM.
 814       *
 815       * @since 3.9.0
 816       */
 817  	public function output_widget_control_templates() {
 818          ?>
 819          <div id="widgets-left"><!-- compatibility with JS which looks for widget templates here -->
 820          <div id="available-widgets">
 821              <div class="customize-section-title">
 822                  <button class="customize-section-back" tabindex="-1">
 823                      <span class="screen-reader-text"><?php _e( 'Back' ); ?></span>
 824                  </button>
 825                  <h3>
 826                      <span class="customize-action">
 827                      <?php
 828                          /* translators: &#9656; is the unicode right-pointing triangle. %s: Section title in the Customizer. */
 829                          echo sprintf( __( 'Customizing &#9656; %s' ), esc_html( $this->manager->get_panel( 'widgets' )->title ) );
 830                      ?>
 831                      </span>
 832                      <?php _e( 'Add a Widget' ); ?>
 833                  </h3>
 834              </div>
 835              <div id="available-widgets-filter">
 836                  <label class="screen-reader-text" for="widgets-search"><?php _e( 'Search Widgets' ); ?></label>
 837                  <input type="text" id="widgets-search" placeholder="<?php esc_attr_e( 'Search widgets&hellip;' ); ?>" aria-describedby="widgets-search-desc" />
 838                  <div class="search-icon" aria-hidden="true"></div>
 839                  <button type="button" class="clear-results"><span class="screen-reader-text"><?php _e( 'Clear Results' ); ?></span></button>
 840                  <p class="screen-reader-text" id="widgets-search-desc"><?php _e( 'The search results will be updated as you type.' ); ?></p>
 841              </div>
 842              <div id="available-widgets-list">
 843              <?php foreach ( $this->get_available_widgets() as $available_widget ) : ?>
 844                  <div id="widget-tpl-<?php echo esc_attr( $available_widget['id'] ); ?>" data-widget-id="<?php echo esc_attr( $available_widget['id'] ); ?>" class="widget-tpl <?php echo esc_attr( $available_widget['id'] ); ?>" tabindex="0">
 845                      <?php echo $available_widget['control_tpl']; ?>
 846                  </div>
 847              <?php endforeach; ?>
 848              <p class="no-widgets-found-message"><?php _e( 'No widgets found.' ); ?></p>
 849              </div><!-- #available-widgets-list -->
 850          </div><!-- #available-widgets -->
 851          </div><!-- #widgets-left -->
 852          <?php
 853      }
 854  
 855      /**
 856       * Calls admin_print_footer_scripts and admin_print_scripts hooks to
 857       * allow custom scripts from plugins.
 858       *
 859       * @since 3.9.0
 860       */
 861  	public function print_footer_scripts() {
 862          /** This action is documented in wp-admin/admin-footer.php */
 863          do_action( 'admin_print_footer_scripts-widgets.php' ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
 864  
 865          /** This action is documented in wp-admin/admin-footer.php */
 866          do_action( 'admin_print_footer_scripts' );
 867  
 868          /** This action is documented in wp-admin/admin-footer.php */
 869          do_action( 'admin_footer-widgets.php' ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
 870      }
 871  
 872      /**
 873       * Retrieves common arguments to supply when constructing a Customizer setting.
 874       *
 875       * @since 3.9.0
 876       *
 877       * @param string $id        Widget setting ID.
 878       * @param array  $overrides Array of setting overrides.
 879       * @return array Possibly modified setting arguments.
 880       */
 881  	public function get_setting_args( $id, $overrides = array() ) {
 882          $args = array(
 883              'type'       => 'option',
 884              'capability' => 'edit_theme_options',
 885              'default'    => array(),
 886          );
 887  
 888          if ( preg_match( $this->setting_id_patterns['sidebar_widgets'], $id, $matches ) ) {
 889              $args['sanitize_callback']    = array( $this, 'sanitize_sidebar_widgets' );
 890              $args['sanitize_js_callback'] = array( $this, 'sanitize_sidebar_widgets_js_instance' );
 891              $args['transport']            = current_theme_supports( 'customize-selective-refresh-widgets' ) ? 'postMessage' : 'refresh';
 892          } elseif ( preg_match( $this->setting_id_patterns['widget_instance'], $id, $matches ) ) {
 893              $args['sanitize_callback']    = array( $this, 'sanitize_widget_instance' );
 894              $args['sanitize_js_callback'] = array( $this, 'sanitize_widget_js_instance' );
 895              $args['transport']            = $this->is_widget_selective_refreshable( $matches['id_base'] ) ? 'postMessage' : 'refresh';
 896          }
 897  
 898          $args = array_merge( $args, $overrides );
 899  
 900          /**
 901           * Filters the common arguments supplied when constructing a Customizer setting.
 902           *
 903           * @since 3.9.0
 904           *
 905           * @see WP_Customize_Setting
 906           *
 907           * @param array  $args Array of Customizer setting arguments.
 908           * @param string $id   Widget setting ID.
 909           */
 910          return apply_filters( 'widget_customizer_setting_args', $args, $id );
 911      }
 912  
 913      /**
 914       * Ensures sidebar widget arrays only ever contain widget IDS.
 915       *
 916       * Used as the 'sanitize_callback' for each $sidebars_widgets setting.
 917       *
 918       * @since 3.9.0
 919       *
 920       * @param string[] $widget_ids Array of widget IDs.
 921       * @return string[] Array of sanitized widget IDs.
 922       */
 923  	public function sanitize_sidebar_widgets( $widget_ids ) {
 924          $widget_ids           = array_map( 'strval', (array) $widget_ids );
 925          $sanitized_widget_ids = array();
 926          foreach ( $widget_ids as $widget_id ) {
 927              $sanitized_widget_ids[] = preg_replace( '/[^a-z0-9_\-]/', '', $widget_id );
 928          }
 929          return $sanitized_widget_ids;
 930      }
 931  
 932      /**
 933       * Builds up an index of all available widgets for use in Backbone models.
 934       *
 935       * @since 3.9.0
 936       *
 937       * @global array $wp_registered_widgets
 938       * @global array $wp_registered_widget_controls
 939       * @staticvar array $available_widgets
 940       *
 941       * @see wp_list_widgets()
 942       *
 943       * @return array List of available widgets.
 944       */
 945  	public function get_available_widgets() {
 946          static $available_widgets = array();
 947          if ( ! empty( $available_widgets ) ) {
 948              return $available_widgets;
 949          }
 950  
 951          global $wp_registered_widgets, $wp_registered_widget_controls;
 952          require_once ABSPATH . 'wp-admin/includes/widgets.php'; // for next_widget_id_number()
 953  
 954          $sort = $wp_registered_widgets;
 955          usort( $sort, array( $this, '_sort_name_callback' ) );
 956          $done = array();
 957  
 958          foreach ( $sort as $widget ) {
 959              if ( in_array( $widget['callback'], $done, true ) ) { // We already showed this multi-widget
 960                  continue;
 961              }
 962  
 963              $sidebar = is_active_widget( $widget['callback'], $widget['id'], false, false );
 964              $done[]  = $widget['callback'];
 965  
 966              if ( ! isset( $widget['params'][0] ) ) {
 967                  $widget['params'][0] = array();
 968              }
 969  
 970              $available_widget = $widget;
 971              unset( $available_widget['callback'] ); // not serializable to JSON
 972  
 973              $args = array(
 974                  'widget_id'   => $widget['id'],
 975                  'widget_name' => $widget['name'],
 976                  '_display'    => 'template',
 977              );
 978  
 979              $is_disabled     = false;
 980              $is_multi_widget = ( isset( $wp_registered_widget_controls[ $widget['id'] ]['id_base'] ) && isset( $widget['params'][0]['number'] ) );
 981              if ( $is_multi_widget ) {
 982                  $id_base            = $wp_registered_widget_controls[ $widget['id'] ]['id_base'];
 983                  $args['_temp_id']   = "$id_base-__i__";
 984                  $args['_multi_num'] = next_widget_id_number( $id_base );
 985                  $args['_add']       = 'multi';
 986              } else {
 987                  $args['_add'] = 'single';
 988  
 989                  if ( $sidebar && 'wp_inactive_widgets' !== $sidebar ) {
 990                      $is_disabled = true;
 991                  }
 992                  $id_base = $widget['id'];
 993              }
 994  
 995              $list_widget_controls_args = wp_list_widget_controls_dynamic_sidebar(
 996                  array(
 997                      0 => $args,
 998                      1 => $widget['params'][0],
 999                  )
1000              );
1001              $control_tpl               = $this->get_widget_control( $list_widget_controls_args );
1002  
1003              // The properties here are mapped to the Backbone Widget model.
1004              $available_widget = array_merge(
1005                  $available_widget,
1006                  array(
1007                      'temp_id'      => isset( $args['_temp_id'] ) ? $args['_temp_id'] : null,
1008                      'is_multi'     => $is_multi_widget,
1009                      'control_tpl'  => $control_tpl,
1010                      'multi_number' => ( $args['_add'] === 'multi' ) ? $args['_multi_num'] : false,
1011                      'is_disabled'  => $is_disabled,
1012                      'id_base'      => $id_base,
1013                      'transport'    => $this->is_widget_selective_refreshable( $id_base ) ? 'postMessage' : 'refresh',
1014                      'width'        => $wp_registered_widget_controls[ $widget['id'] ]['width'],
1015                      'height'       => $wp_registered_widget_controls[ $widget['id'] ]['height'],
1016                      'is_wide'      => $this->is_wide_widget( $widget['id'] ),
1017                  )
1018              );
1019  
1020              $available_widgets[] = $available_widget;
1021          }
1022  
1023          return $available_widgets;
1024      }
1025  
1026      /**
1027       * Naturally orders available widgets by name.
1028       *
1029       * @since 3.9.0
1030       *
1031       * @param array $widget_a The first widget to compare.
1032       * @param array $widget_b The second widget to compare.
1033       * @return int Reorder position for the current widget comparison.
1034       */
1035  	protected function _sort_name_callback( $widget_a, $widget_b ) {
1036          return strnatcasecmp( $widget_a['name'], $widget_b['name'] );
1037      }
1038  
1039      /**
1040       * Retrieves the widget control markup.
1041       *
1042       * @since 3.9.0
1043       *
1044       * @param array $args Widget control arguments.
1045       * @return string Widget control form HTML markup.
1046       */
1047  	public function get_widget_control( $args ) {
1048          $args[0]['before_form']           = '<div class="form">';
1049          $args[0]['after_form']            = '</div><!-- .form -->';
1050          $args[0]['before_widget_content'] = '<div class="widget-content">';
1051          $args[0]['after_widget_content']  = '</div><!-- .widget-content -->';
1052          ob_start();
1053          wp_widget_control( ...$args );
1054          $control_tpl = ob_get_clean();
1055          return $control_tpl;
1056      }
1057  
1058      /**
1059       * Retrieves the widget control markup parts.
1060       *
1061       * @since 4.4.0
1062       *
1063       * @param array $args Widget control arguments.
1064       * @return array {
1065       *     @type string $control Markup for widget control wrapping form.
1066       *     @type string $content The contents of the widget form itself.
1067       * }
1068       */
1069  	public function get_widget_control_parts( $args ) {
1070          $args[0]['before_widget_content'] = '<div class="widget-content">';
1071          $args[0]['after_widget_content']  = '</div><!-- .widget-content -->';
1072          $control_markup                   = $this->get_widget_control( $args );
1073  
1074          $content_start_pos = strpos( $control_markup, $args[0]['before_widget_content'] );
1075          $content_end_pos   = strrpos( $control_markup, $args[0]['after_widget_content'] );
1076  
1077          $control  = substr( $control_markup, 0, $content_start_pos + strlen( $args[0]['before_widget_content'] ) );
1078          $control .= substr( $control_markup, $content_end_pos );
1079          $content  = trim(
1080              substr(
1081                  $control_markup,
1082                  $content_start_pos + strlen( $args[0]['before_widget_content'] ),
1083                  $content_end_pos - $content_start_pos - strlen( $args[0]['before_widget_content'] )
1084              )
1085          );
1086  
1087          return compact( 'control', 'content' );
1088      }
1089  
1090      /**
1091       * Adds hooks for the Customizer preview.
1092       *
1093       * @since 3.9.0
1094       */
1095  	public function customize_preview_init() {
1096          add_action( 'wp_enqueue_scripts', array( $this, 'customize_preview_enqueue' ) );
1097          add_action( 'wp_print_styles', array( $this, 'print_preview_css' ), 1 );
1098          add_action( 'wp_footer', array( $this, 'export_preview_data' ), 20 );
1099      }
1100  
1101      /**
1102       * Refreshes the nonce for widget updates.
1103       *
1104       * @since 4.2.0
1105       *
1106       * @param  array $nonces Array of nonces.
1107       * @return array $nonces Array of nonces.
1108       */
1109  	public function refresh_nonces( $nonces ) {
1110          $nonces['update-widget'] = wp_create_nonce( 'update-widget' );
1111          return $nonces;
1112      }
1113  
1114      /**
1115       * When previewing, ensures the proper previewing widgets are used.
1116       *
1117       * Because wp_get_sidebars_widgets() gets called early at {@see 'init' } (via
1118       * wp_convert_widget_settings()) and can set global variable `$_wp_sidebars_widgets`
1119       * to the value of `get_option( 'sidebars_widgets' )` before the Customizer preview
1120       * filter is added, it has to be reset after the filter has been added.
1121       *
1122       * @since 3.9.0
1123       *
1124       * @param array $sidebars_widgets List of widgets for the current sidebar.
1125       * @return array
1126       */
1127  	public function preview_sidebars_widgets( $sidebars_widgets ) {
1128          $sidebars_widgets = get_option( 'sidebars_widgets', array() );
1129  
1130          unset( $sidebars_widgets['array_version'] );
1131          return $sidebars_widgets;
1132      }
1133  
1134      /**
1135       * Enqueues scripts for the Customizer preview.
1136       *
1137       * @since 3.9.0
1138       */
1139  	public function customize_preview_enqueue() {
1140          wp_enqueue_script( 'customize-preview-widgets' );
1141      }
1142  
1143      /**
1144       * Inserts default style for highlighted widget at early point so theme
1145       * stylesheet can override.
1146       *
1147       * @since 3.9.0
1148       */
1149  	public function print_preview_css() {
1150          ?>
1151          <style>
1152          .widget-customizer-highlighted-widget {
1153              outline: none;
1154              -webkit-box-shadow: 0 0 2px rgba(30, 140, 190, 0.8);
1155              box-shadow: 0 0 2px rgba(30, 140, 190, 0.8);
1156              position: relative;
1157              z-index: 1;
1158          }
1159          </style>
1160          <?php
1161      }
1162  
1163      /**
1164       * Communicates the sidebars that appeared on the page at the very end of the page,
1165       * and at the very end of the wp_footer,
1166       *
1167       * @since 3.9.0
1168       *
1169       * @global array $wp_registered_sidebars
1170       * @global array $wp_registered_widgets
1171       */
1172  	public function export_preview_data() {
1173          global $wp_registered_sidebars, $wp_registered_widgets;
1174  
1175          $switched_locale = switch_to_locale( get_user_locale() );
1176          $l10n            = array(
1177              'widgetTooltip' => __( 'Shift-click to edit this widget.' ),
1178          );
1179          if ( $switched_locale ) {
1180              restore_previous_locale();
1181          }
1182  
1183          // Prepare Customizer settings to pass to JavaScript.
1184          $settings = array(
1185              'renderedSidebars'            => array_fill_keys( array_unique( $this->rendered_sidebars ), true ),
1186              'renderedWidgets'             => array_fill_keys( array_keys( $this->rendered_widgets ), true ),
1187              'registeredSidebars'          => array_values( $wp_registered_sidebars ),
1188              'registeredWidgets'           => $wp_registered_widgets,
1189              'l10n'                        => $l10n,
1190              'selectiveRefreshableWidgets' => $this->get_selective_refreshable_widgets(),
1191          );
1192          foreach ( $settings['registeredWidgets'] as &$registered_widget ) {
1193              unset( $registered_widget['callback'] ); // may not be JSON-serializeable
1194          }
1195  
1196          ?>
1197          <script type="text/javascript">
1198              var _wpWidgetCustomizerPreviewSettings = <?php echo wp_json_encode( $settings ); ?>;
1199          </script>
1200          <?php
1201      }
1202  
1203      /**
1204       * Tracks the widgets that were rendered.
1205       *
1206       * @since 3.9.0
1207       *
1208       * @param array $widget Rendered widget to tally.
1209       */
1210  	public function tally_rendered_widgets( $widget ) {
1211          $this->rendered_widgets[ $widget['id'] ] = true;
1212      }
1213  
1214      /**
1215       * Determine if a widget is rendered on the page.
1216       *
1217       * @since 4.0.0
1218       *
1219       * @param string $widget_id Widget ID to check.
1220       * @return bool Whether the widget is rendered.
1221       */
1222  	public function is_widget_rendered( $widget_id ) {
1223          return in_array( $widget_id, $this->rendered_widgets );
1224      }
1225  
1226      /**
1227       * Determines if a sidebar is rendered on the page.
1228       *
1229       * @since 4.0.0
1230       *
1231       * @param string $sidebar_id Sidebar ID to check.
1232       * @return bool Whether the sidebar is rendered.
1233       */
1234  	public function is_sidebar_rendered( $sidebar_id ) {
1235          return in_array( $sidebar_id, $this->rendered_sidebars );
1236      }
1237  
1238      /**
1239       * Tallies the sidebars rendered via is_active_sidebar().
1240       *
1241       * Keep track of the times that is_active_sidebar() is called in the template,
1242       * and assume that this means that the sidebar would be rendered on the template
1243       * if there were widgets populating it.
1244       *
1245       * @since 3.9.0
1246       *
1247       * @param bool   $is_active  Whether the sidebar is active.
1248       * @param string $sidebar_id Sidebar ID.
1249       * @return bool Whether the sidebar is active.
1250       */
1251  	public function tally_sidebars_via_is_active_sidebar_calls( $is_active, $sidebar_id ) {
1252          if ( is_registered_sidebar( $sidebar_id ) ) {
1253              $this->rendered_sidebars[] = $sidebar_id;
1254          }
1255          /*
1256           * We may need to force this to true, and also force-true the value
1257           * for 'dynamic_sidebar_has_widgets' if we want to ensure that there
1258           * is an area to drop widgets into, if the sidebar is empty.
1259           */
1260          return $is_active;
1261      }
1262  
1263      /**
1264       * Tallies the sidebars rendered via dynamic_sidebar().
1265       *
1266       * Keep track of the times that dynamic_sidebar() is called in the template,
1267       * and assume this means the sidebar would be rendered on the template if
1268       * there were widgets populating it.
1269       *
1270       * @since 3.9.0
1271       *
1272       * @param bool   $has_widgets Whether the current sidebar has widgets.
1273       * @param string $sidebar_id  Sidebar ID.
1274       * @return bool Whether the current sidebar has widgets.
1275       */
1276  	public function tally_sidebars_via_dynamic_sidebar_calls( $has_widgets, $sidebar_id ) {
1277          if ( is_registered_sidebar( $sidebar_id ) ) {
1278              $this->rendered_sidebars[] = $sidebar_id;
1279          }
1280  
1281          /*
1282           * We may need to force this to true, and also force-true the value
1283           * for 'is_active_sidebar' if we want to ensure there is an area to
1284           * drop widgets into, if the sidebar is empty.
1285           */
1286          return $has_widgets;
1287      }
1288  
1289      /**
1290       * Retrieves MAC for a serialized widget instance string.
1291       *
1292       * Allows values posted back from JS to be rejected if any tampering of the
1293       * data has occurred.
1294       *
1295       * @since 3.9.0
1296       *
1297       * @param string $serialized_instance Widget instance.
1298       * @return string MAC for serialized widget instance.
1299       */
1300  	protected function get_instance_hash_key( $serialized_instance ) {
1301          return wp_hash( $serialized_instance );
1302      }
1303  
1304      /**
1305       * Sanitizes a widget instance.
1306       *
1307       * Unserialize the JS-instance for storing in the options. It's important that this filter
1308       * only get applied to an instance *once*.
1309       *
1310       * @since 3.9.0
1311       *
1312       * @param array $value Widget instance to sanitize.
1313       * @return array|void Sanitized widget instance.
1314       */
1315  	public function sanitize_widget_instance( $value ) {
1316          if ( $value === array() ) {
1317              return $value;
1318          }
1319  
1320          if ( empty( $value['is_widget_customizer_js_value'] )
1321              || empty( $value['instance_hash_key'] )
1322              || empty( $value['encoded_serialized_instance'] ) ) {
1323              return;
1324          }
1325  
1326          $decoded = base64_decode( $value['encoded_serialized_instance'], true );
1327          if ( false === $decoded ) {
1328              return;
1329          }
1330  
1331          if ( ! hash_equals( $this->get_instance_hash_key( $decoded ), $value['instance_hash_key'] ) ) {
1332              return;
1333          }
1334  
1335          $instance = unserialize( $decoded );
1336          if ( false === $instance ) {
1337              return;
1338          }
1339  
1340          return $instance;
1341      }
1342  
1343      /**
1344       * Converts a widget instance into JSON-representable format.
1345       *
1346       * @since 3.9.0
1347       *
1348       * @param array $value Widget instance to convert to JSON.
1349       * @return array JSON-converted widget instance.
1350       */
1351  	public function sanitize_widget_js_instance( $value ) {
1352          if ( empty( $value['is_widget_customizer_js_value'] ) ) {
1353              $serialized = serialize( $value );
1354  
1355              $value = array(
1356                  'encoded_serialized_instance'   => base64_encode( $serialized ),
1357                  'title'                         => empty( $value['title'] ) ? '' : $value['title'],
1358                  'is_widget_customizer_js_value' => true,
1359                  'instance_hash_key'             => $this->get_instance_hash_key( $serialized ),
1360              );
1361          }
1362          return $value;
1363      }
1364  
1365      /**
1366       * Strips out widget IDs for widgets which are no longer registered.
1367       *
1368       * One example where this might happen is when a plugin orphans a widget
1369       * in a sidebar upon deactivation.
1370       *
1371       * @since 3.9.0
1372       *
1373       * @global array $wp_registered_widgets
1374       *
1375       * @param array $widget_ids List of widget IDs.
1376       * @return array Parsed list of widget IDs.
1377       */
1378  	public function sanitize_sidebar_widgets_js_instance( $widget_ids ) {
1379          global $wp_registered_widgets;
1380          $widget_ids = array_values( array_intersect( $widget_ids, array_keys( $wp_registered_widgets ) ) );
1381          return $widget_ids;
1382      }
1383  
1384      /**
1385       * Finds and invokes the widget update and control callbacks.
1386       *
1387       * Requires that `$_POST` be populated with the instance data.
1388       *
1389       * @since 3.9.0
1390       *
1391       * @global array $wp_registered_widget_updates
1392       * @global array $wp_registered_widget_controls
1393       *
1394       * @param  string $widget_id Widget ID.
1395       * @return WP_Error|array Array containing the updated widget information.
1396       *                        A WP_Error object, otherwise.
1397       */
1398  	public function call_widget_update( $widget_id ) {
1399          global $wp_registered_widget_updates, $wp_registered_widget_controls;
1400  
1401          $setting_id = $this->get_setting_id( $widget_id );
1402  
1403          /*
1404           * Make sure that other setting changes have previewed since this widget
1405           * may depend on them (e.g. Menus being present for Navigation Menu widget).
1406           */
1407          if ( ! did_action( 'customize_preview_init' ) ) {
1408              foreach ( $this->manager->settings() as $setting ) {
1409                  if ( $setting->id !== $setting_id ) {
1410                      $setting->preview();
1411                  }
1412              }
1413          }
1414  
1415          $this->start_capturing_option_updates();
1416          $parsed_id   = $this->parse_widget_id( $widget_id );
1417          $option_name = 'widget_' . $parsed_id['id_base'];
1418  
1419          /*
1420           * If a previously-sanitized instance is provided, populate the input vars
1421           * with its values so that the widget update callback will read this instance
1422           */
1423          $added_input_vars = array();
1424          if ( ! empty( $_POST['sanitized_widget_setting'] ) ) {
1425              $sanitized_widget_setting = json_decode( $this->get_post_value( 'sanitized_widget_setting' ), true );
1426              if ( false === $sanitized_widget_setting ) {
1427                  $this->stop_capturing_option_updates();
1428                  return new WP_Error( 'widget_setting_malformed' );
1429              }
1430  
1431              $instance = $this->sanitize_widget_instance( $sanitized_widget_setting );
1432              if ( is_null( $instance ) ) {
1433                  $this->stop_capturing_option_updates();
1434                  return new WP_Error( 'widget_setting_unsanitized' );
1435              }
1436  
1437              if ( ! is_null( $parsed_id['number'] ) ) {
1438                  $value                         = array();
1439                  $value[ $parsed_id['number'] ] = $instance;
1440                  $key                           = 'widget-' . $parsed_id['id_base'];
1441                  $_REQUEST[ $key ]              = wp_slash( $value );
1442                  $_POST[ $key ]                 = $_REQUEST[ $key ];
1443                  $added_input_vars[]            = $key;
1444              } else {
1445                  foreach ( $instance as $key => $value ) {
1446                      $_REQUEST[ $key ]   = wp_slash( $value );
1447                      $_POST[ $key ]      = $_REQUEST[ $key ];
1448                      $added_input_vars[] = $key;
1449                  }
1450              }
1451          }
1452  
1453          // Invoke the widget update callback.
1454          foreach ( (array) $wp_registered_widget_updates as $name => $control ) {
1455              if ( $name === $parsed_id['id_base'] && is_callable( $control['callback'] ) ) {
1456                  ob_start();
1457                  call_user_func_array( $control['callback'], $control['params'] );
1458                  ob_end_clean();
1459                  break;
1460              }
1461          }
1462  
1463          // Clean up any input vars that were manually added
1464          foreach ( $added_input_vars as $key ) {
1465              unset( $_POST[ $key ] );
1466              unset( $_REQUEST[ $key ] );
1467          }
1468  
1469          // Make sure the expected option was updated.
1470          if ( 0 !== $this->count_captured_options() ) {
1471              if ( $this->count_captured_options() > 1 ) {
1472                  $this->stop_capturing_option_updates();
1473                  return new WP_Error( 'widget_setting_too_many_options' );
1474              }
1475  
1476              $updated_option_name = key( $this->get_captured_options() );
1477              if ( $updated_option_name !== $option_name ) {
1478                  $this->stop_capturing_option_updates();
1479                  return new WP_Error( 'widget_setting_unexpected_option' );
1480              }
1481          }
1482  
1483          // Obtain the widget instance.
1484          $option = $this->get_captured_option( $option_name );
1485          if ( null !== $parsed_id['number'] ) {
1486              $instance = $option[ $parsed_id['number'] ];
1487          } else {
1488              $instance = $option;
1489          }
1490  
1491          /*
1492           * Override the incoming $_POST['customized'] for a newly-created widget's
1493           * setting with the new $instance so that the preview filter currently
1494           * in place from WP_Customize_Setting::preview() will use this value
1495           * instead of the default widget instance value (an empty array).
1496           */
1497          $this->manager->set_post_value( $setting_id, $this->sanitize_widget_js_instance( $instance ) );
1498  
1499          // Obtain the widget control with the updated instance in place.
1500          ob_start();
1501          $form = $wp_registered_widget_controls[ $widget_id ];
1502          if ( $form ) {
1503              call_user_func_array( $form['callback'], $form['params'] );
1504          }
1505          $form = ob_get_clean();
1506  
1507          $this->stop_capturing_option_updates();
1508  
1509          return compact( 'instance', 'form' );
1510      }
1511  
1512      /**
1513       * Updates widget settings asynchronously.
1514       *
1515       * Allows the Customizer to update a widget using its form, but return the new
1516       * instance info via Ajax instead of saving it to the options table.
1517       *
1518       * Most code here copied from wp_ajax_save_widget().
1519       *
1520       * @since 3.9.0
1521       *
1522       * @see wp_ajax_save_widget()
1523       */
1524  	public function wp_ajax_update_widget() {
1525  
1526          if ( ! is_user_logged_in() ) {
1527              wp_die( 0 );
1528          }
1529  
1530          check_ajax_referer( 'update-widget', 'nonce' );
1531  
1532          if ( ! current_user_can( 'edit_theme_options' ) ) {
1533              wp_die( -1 );
1534          }
1535  
1536          if ( empty( $_POST['widget-id'] ) ) {
1537              wp_send_json_error( 'missing_widget-id' );
1538          }
1539  
1540          /** This action is documented in wp-admin/includes/ajax-actions.php */
1541          do_action( 'load-widgets.php' ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
1542  
1543          /** This action is documented in wp-admin/includes/ajax-actions.php */
1544          do_action( 'widgets.php' ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
1545  
1546          /** This action is documented in wp-admin/widgets.php */
1547          do_action( 'sidebar_admin_setup' );
1548  
1549          $widget_id = $this->get_post_value( 'widget-id' );
1550          $parsed_id = $this->parse_widget_id( $widget_id );
1551          $id_base   = $parsed_id['id_base'];
1552  
1553          $is_updating_widget_template = (
1554              isset( $_POST[ 'widget-' . $id_base ] )
1555              &&
1556              is_array( $_POST[ 'widget-' . $id_base ] )
1557              &&
1558              preg_match( '/__i__|%i%/', key( $_POST[ 'widget-' . $id_base ] ) )
1559          );
1560          if ( $is_updating_widget_template ) {
1561              wp_send_json_error( 'template_widget_not_updatable' );
1562          }
1563  
1564          $updated_widget = $this->call_widget_update( $widget_id ); // => {instance,form}
1565          if ( is_wp_error( $updated_widget ) ) {
1566              wp_send_json_error( $updated_widget->get_error_code() );
1567          }
1568  
1569          $form     = $updated_widget['form'];
1570          $instance = $this->sanitize_widget_js_instance( $updated_widget['instance'] );
1571  
1572          wp_send_json_success( compact( 'form', 'instance' ) );
1573      }
1574  
1575      /*
1576       * Selective Refresh Methods
1577       */
1578  
1579      /**
1580       * Filters arguments for dynamic widget partials.
1581       *
1582       * @since 4.5.0
1583       *
1584       * @param array|false $partial_args Partial arguments.
1585       * @param string      $partial_id   Partial ID.
1586       * @return array (Maybe) modified partial arguments.
1587       */
1588  	public function customize_dynamic_partial_args( $partial_args, $partial_id ) {
1589          if ( ! current_theme_supports( 'customize-selective-refresh-widgets' ) ) {
1590              return $partial_args;
1591          }
1592  
1593          if ( preg_match( '/^widget\[(?P<widget_id>.+)\]$/', $partial_id, $matches ) ) {
1594              if ( false === $partial_args ) {
1595                  $partial_args = array();
1596              }
1597              $partial_args = array_merge(
1598                  $partial_args,
1599                  array(
1600                      'type'                => 'widget',
1601                      'render_callback'     => array( $this, 'render_widget_partial' ),
1602                      'container_inclusive' => true,
1603                      'settings'            => array( $this->get_setting_id( $matches['widget_id'] ) ),
1604                      'capability'          => 'edit_theme_options',
1605                  )
1606              );
1607          }
1608  
1609          return $partial_args;
1610      }
1611  
1612      /**
1613       * Adds hooks for selective refresh.
1614       *
1615       * @since 4.5.0
1616       */
1617  	public function selective_refresh_init() {
1618          if ( ! current_theme_supports( 'customize-selective-refresh-widgets' ) ) {
1619              return;
1620          }
1621          add_filter( 'dynamic_sidebar_params', array( $this, 'filter_dynamic_sidebar_params' ) );
1622          add_filter( 'wp_kses_allowed_html', array( $this, 'filter_wp_kses_allowed_data_attributes' ) );
1623          add_action( 'dynamic_sidebar_before', array( $this, 'start_dynamic_sidebar' ) );
1624          add_action( 'dynamic_sidebar_after', array( $this, 'end_dynamic_sidebar' ) );
1625      }
1626  
1627      /**
1628       * Inject selective refresh data attributes into widget container elements.
1629       *
1630       * @since 4.5.0
1631       *
1632       * @param array $params {
1633       *     Dynamic sidebar params.
1634       *
1635       *     @type array $args        Sidebar args.
1636       *     @type array $widget_args Widget args.
1637       * }
1638       * @see WP_Customize_Nav_Menus::filter_wp_nav_menu_args()
1639       *
1640       * @return array Params.
1641       */
1642  	public function filter_dynamic_sidebar_params( $params ) {
1643          $sidebar_args = array_merge(
1644              array(
1645                  'before_widget' => '',
1646                  'after_widget'  => '',
1647              ),
1648              $params[0]
1649          );
1650  
1651          // Skip widgets not in a registered sidebar or ones which lack a proper wrapper element to attach the data-* attributes to.
1652          $matches  = array();
1653          $is_valid = (
1654              isset( $sidebar_args['id'] )
1655              &&
1656              is_registered_sidebar( $sidebar_args['id'] )
1657              &&
1658              ( isset( $this->current_dynamic_sidebar_id_stack[0] ) && $this->current_dynamic_sidebar_id_stack[0] === $sidebar_args['id'] )
1659              &&
1660              preg_match( '#^<(?P<tag_name>\w+)#', $sidebar_args['before_widget'], $matches )
1661          );
1662          if ( ! $is_valid ) {
1663              return $params;
1664          }
1665          $this->before_widget_tags_seen[ $matches['tag_name'] ] = true;
1666  
1667          $context = array(
1668              'sidebar_id' => $sidebar_args['id'],
1669          );
1670          if ( isset( $this->context_sidebar_instance_number ) ) {
1671              $context['sidebar_instance_number'] = $this->context_sidebar_instance_number;
1672          } elseif ( isset( $sidebar_args['id'] ) && isset( $this->sidebar_instance_count[ $sidebar_args['id'] ] ) ) {
1673              $context['sidebar_instance_number'] = $this->sidebar_instance_count[ $sidebar_args['id'] ];
1674          }
1675  
1676          $attributes                    = sprintf( ' data-customize-partial-id="%s"', esc_attr( 'widget[' . $sidebar_args['widget_id'] . ']' ) );
1677          $attributes                   .= ' data-customize-partial-type="widget"';
1678          $attributes                   .= sprintf( ' data-customize-partial-placement-context="%s"', esc_attr( wp_json_encode( $context ) ) );
1679          $attributes                   .= sprintf( ' data-customize-widget-id="%s"', esc_attr( $sidebar_args['widget_id'] ) );
1680          $sidebar_args['before_widget'] = preg_replace( '#^(<\w+)#', '$1 ' . $attributes, $sidebar_args['before_widget'] );
1681  
1682          $params[0] = $sidebar_args;
1683          return $params;
1684      }
1685  
1686      /**
1687       * List of the tag names seen for before_widget strings.
1688       *
1689       * This is used in the {@see 'filter_wp_kses_allowed_html'} filter to ensure that the
1690       * data-* attributes can be whitelisted.
1691       *
1692       * @since 4.5.0
1693       * @var array
1694       */
1695      protected $before_widget_tags_seen = array();
1696  
1697      /**
1698       * Ensures the HTML data-* attributes for selective refresh are allowed by kses.
1699       *
1700       * This is needed in case the `$before_widget` is run through wp_kses() when printed.
1701       *
1702       * @since 4.5.0
1703       *
1704       * @param array $allowed_html Allowed HTML.
1705       * @return array (Maybe) modified allowed HTML.
1706       */
1707  	public function filter_wp_kses_allowed_data_attributes( $allowed_html ) {
1708          foreach ( array_keys( $this->before_widget_tags_seen ) as $tag_name ) {
1709              if ( ! isset( $allowed_html[ $tag_name ] ) ) {
1710                  $allowed_html[ $tag_name ] = array();
1711              }
1712              $allowed_html[ $tag_name ] = array_merge(
1713                  $allowed_html[ $tag_name ],
1714                  array_fill_keys(
1715                      array(
1716                          'data-customize-partial-id',
1717                          'data-customize-partial-type',
1718                          'data-customize-partial-placement-context',
1719                          'data-customize-partial-widget-id',
1720                          'data-customize-partial-options',
1721                      ),
1722                      true
1723                  )
1724              );
1725          }
1726          return $allowed_html;
1727      }
1728  
1729      /**
1730       * Keep track of the number of times that dynamic_sidebar() was called for a given sidebar index.
1731       *
1732       * This helps facilitate the uncommon scenario where a single sidebar is rendered multiple times on a template.
1733       *
1734       * @since 4.5.0
1735       * @var array
1736       */
1737      protected $sidebar_instance_count = array();
1738  
1739      /**
1740       * The current request's sidebar_instance_number context.
1741       *
1742       * @since 4.5.0
1743       * @var int|null
1744       */
1745      protected $context_sidebar_instance_number;
1746  
1747      /**
1748       * Current sidebar ID being rendered.
1749       *
1750       * @since 4.5.0
1751       * @var array
1752       */
1753      protected $current_dynamic_sidebar_id_stack = array();
1754  
1755      /**
1756       * Begins keeping track of the current sidebar being rendered.
1757       *
1758       * Insert marker before widgets are rendered in a dynamic sidebar.
1759       *
1760       * @since 4.5.0
1761       *
1762       * @param int|string $index Index, name, or ID of the dynamic sidebar.
1763       */
1764  	public function start_dynamic_sidebar( $index ) {
1765          array_unshift( $this->current_dynamic_sidebar_id_stack, $index );
1766          if ( ! isset( $this->sidebar_instance_count[ $index ] ) ) {
1767              $this->sidebar_instance_count[ $index ] = 0;
1768          }
1769          $this->sidebar_instance_count[ $index ] += 1;
1770          if ( ! $this->manager->selective_refresh->is_render_partials_request() ) {
1771              printf( "\n<!--dynamic_sidebar_before:%s:%d-->\n", esc_html( $index ), intval( $this->sidebar_instance_count[ $index ] ) );
1772          }
1773      }
1774  
1775      /**
1776       * Finishes keeping track of the current sidebar being rendered.
1777       *
1778       * Inserts a marker after widgets are rendered in a dynamic sidebar.
1779       *
1780       * @since 4.5.0
1781       *
1782       * @param int|string $index Index, name, or ID of the dynamic sidebar.
1783       */
1784  	public function end_dynamic_sidebar( $index ) {
1785          array_shift( $this->current_dynamic_sidebar_id_stack );
1786          if ( ! $this->manager->selective_refresh->is_render_partials_request() ) {
1787              printf( "\n<!--dynamic_sidebar_after:%s:%d-->\n", esc_html( $index ), intval( $this->sidebar_instance_count[ $index ] ) );
1788          }
1789      }
1790  
1791      /**
1792       * Current sidebar being rendered.
1793       *
1794       * @since 4.5.0
1795       * @var string|null
1796       */
1797      protected $rendering_widget_id;
1798  
1799      /**
1800       * Current widget being rendered.
1801       *
1802       * @since 4.5.0
1803       * @var string|null
1804       */
1805      protected $rendering_sidebar_id;
1806  
1807      /**
1808       * Filters sidebars_widgets to ensure the currently-rendered widget is the only widget in the current sidebar.
1809       *
1810       * @since 4.5.0
1811       *
1812       * @param array $sidebars_widgets Sidebars widgets.
1813       * @return array Filtered sidebars widgets.
1814       */
1815  	public function filter_sidebars_widgets_for_rendering_widget( $sidebars_widgets ) {
1816          $sidebars_widgets[ $this->rendering_sidebar_id ] = array( $this->rendering_widget_id );
1817          return $sidebars_widgets;
1818      }
1819  
1820      /**
1821       * Renders a specific widget using the supplied sidebar arguments.
1822       *
1823       * @since 4.5.0
1824       *
1825       * @see dynamic_sidebar()
1826       *
1827       * @param WP_Customize_Partial $partial Partial.
1828       * @param array                $context {
1829       *     Sidebar args supplied as container context.
1830       *
1831       *     @type string $sidebar_id              ID for sidebar for widget to render into.
1832       *     @type int    $sidebar_instance_number Disambiguating instance number.
1833       * }
1834       * @return string|false
1835       */
1836  	public function render_widget_partial( $partial, $context ) {
1837          $id_data   = $partial->id_data();
1838          $widget_id = array_shift( $id_data['keys'] );
1839  
1840          if ( ! is_array( $context )
1841              || empty( $context['sidebar_id'] )
1842              || ! is_registered_sidebar( $context['sidebar_id'] )
1843          ) {
1844              return false;
1845          }
1846  
1847          $this->rendering_sidebar_id = $context['sidebar_id'];
1848  
1849          if ( isset( $context['sidebar_instance_number'] ) ) {
1850              $this->context_sidebar_instance_number = intval( $context['sidebar_instance_number'] );
1851          }
1852  
1853          // Filter sidebars_widgets so that only the queried widget is in the sidebar.
1854          $this->rendering_widget_id = $widget_id;
1855  
1856          $filter_callback = array( $this, 'filter_sidebars_widgets_for_rendering_widget' );
1857          add_filter( 'sidebars_widgets', $filter_callback, 1000 );
1858  
1859          // Render the widget.
1860          ob_start();
1861          $this->rendering_sidebar_id = $context['sidebar_id'];
1862          dynamic_sidebar( $this->rendering_sidebar_id );
1863          $container = ob_get_clean();
1864  
1865          // Reset variables for next partial render.
1866          remove_filter( 'sidebars_widgets', $filter_callback, 1000 );
1867  
1868          $this->context_sidebar_instance_number = null;
1869          $this->rendering_sidebar_id            = null;
1870          $this->rendering_widget_id             = null;
1871  
1872          return $container;
1873      }
1874  
1875      //
1876      // Option Update Capturing
1877      //
1878  
1879      /**
1880       * List of captured widget option updates.
1881       *
1882       * @since 3.9.0
1883       * @var array $_captured_options Values updated while option capture is happening.
1884       */
1885      protected $_captured_options = array();
1886  
1887      /**
1888       * Whether option capture is currently happening.
1889       *
1890       * @since 3.9.0
1891       * @var bool $_is_current Whether option capture is currently happening or not.
1892       */
1893      protected $_is_capturing_option_updates = false;
1894  
1895      /**
1896       * Determines whether the captured option update should be ignored.
1897       *
1898       * @since 3.9.0
1899       *
1900       * @param string $option_name Option name.
1901       * @return bool Whether the option capture is ignored.
1902       */
1903  	protected function is_option_capture_ignored( $option_name ) {
1904          return ( 0 === strpos( $option_name, '_transient_' ) );
1905      }
1906  
1907      /**
1908       * Retrieves captured widget option updates.
1909       *
1910       * @since 3.9.0
1911       *
1912       * @return array Array of captured options.
1913       */
1914  	protected function get_captured_options() {
1915          return $this->_captured_options;
1916      }
1917  
1918      /**
1919       * Retrieves the option that was captured from being saved.
1920       *
1921       * @since 4.2.0
1922       *
1923       * @param string $option_name Option name.
1924       * @param mixed  $default     Optional. Default value to return if the option does not exist. Default false.
1925       * @return mixed Value set for the option.
1926       */
1927  	protected function get_captured_option( $option_name, $default = false ) {
1928          if ( array_key_exists( $option_name, $this->_captured_options ) ) {
1929              $value = $this->_captured_options[ $option_name ];
1930          } else {
1931              $value = $default;
1932          }
1933          return $value;
1934      }
1935  
1936      /**
1937       * Retrieves the number of captured widget option updates.
1938       *
1939       * @since 3.9.0
1940       *
1941       * @return int Number of updated options.
1942       */
1943  	protected function count_captured_options() {
1944          return count( $this->_captured_options );
1945      }
1946  
1947      /**
1948       * Begins keeping track of changes to widget options, caching new values.
1949       *
1950       * @since 3.9.0
1951       */
1952  	protected function start_capturing_option_updates() {
1953          if ( $this->_is_capturing_option_updates ) {
1954              return;
1955          }
1956  
1957          $this->_is_capturing_option_updates = true;
1958  
1959          add_filter( 'pre_update_option', array( $this, 'capture_filter_pre_update_option' ), 10, 3 );
1960      }
1961  
1962      /**
1963       * Pre-filters captured option values before updating.
1964       *
1965       * @since 3.9.0
1966       *
1967       * @param mixed  $new_value   The new option value.
1968       * @param string $option_name Name of the option.
1969       * @param mixed  $old_value   The old option value.
1970       * @return mixed Filtered option value.
1971       */
1972  	public function capture_filter_pre_update_option( $new_value, $option_name, $old_value ) {
1973          if ( $this->is_option_capture_ignored( $option_name ) ) {
1974              return $new_value;
1975          }
1976  
1977          if ( ! isset( $this->_captured_options[ $option_name ] ) ) {
1978              add_filter( "pre_option_{$option_name}", array( $this, 'capture_filter_pre_get_option' ) );
1979          }
1980  
1981          $this->_captured_options[ $option_name ] = $new_value;
1982  
1983          return $old_value;
1984      }
1985  
1986      /**
1987       * Pre-filters captured option values before retrieving.
1988       *
1989       * @since 3.9.0
1990       *
1991       * @param mixed $value Value to return instead of the option value.
1992       * @return mixed Filtered option value.
1993       */
1994  	public function capture_filter_pre_get_option( $value ) {
1995          $option_name = preg_replace( '/^pre_option_/', '', current_filter() );
1996  
1997          if ( isset( $this->_captured_options[ $option_name ] ) ) {
1998              $value = $this->_captured_options[ $option_name ];
1999  
2000              /** This filter is documented in wp-includes/option.php */
2001              $value = apply_filters( 'option_' . $option_name, $value, $option_name );
2002          }
2003  
2004          return $value;
2005      }
2006  
2007      /**
2008       * Undoes any changes to the options since options capture began.
2009       *
2010       * @since 3.9.0
2011       */
2012  	protected function stop_capturing_option_updates() {
2013          if ( ! $this->_is_capturing_option_updates ) {
2014              return;
2015          }
2016  
2017          remove_filter( 'pre_update_option', array( $this, 'capture_filter_pre_update_option' ), 10 );
2018  
2019          foreach ( array_keys( $this->_captured_options ) as $option_name ) {
2020              remove_filter( "pre_option_{$option_name}", array( $this, 'capture_filter_pre_get_option' ) );
2021          }
2022  
2023          $this->_captured_options            = array();
2024          $this->_is_capturing_option_updates = false;
2025      }
2026  
2027      /**
2028       * {@internal Missing Summary}
2029       *
2030       * See the {@see 'customize_dynamic_setting_args'} filter.
2031       *
2032       * @since 3.9.0
2033       * @deprecated 4.2.0 Deprecated in favor of the {@see 'customize_dynamic_setting_args'} filter.
2034       */
2035  	public function setup_widget_addition_previews() {
2036          _deprecated_function( __METHOD__, '4.2.0', 'customize_dynamic_setting_args' );
2037      }
2038  
2039      /**
2040       * {@internal Missing Summary}
2041       *
2042       * See the {@see 'customize_dynamic_setting_args'} filter.
2043       *
2044       * @since 3.9.0
2045       * @deprecated 4.2.0 Deprecated in favor of the {@see 'customize_dynamic_setting_args'} filter.
2046       */
2047  	public function prepreview_added_sidebars_widgets() {
2048          _deprecated_function( __METHOD__, '4.2.0', 'customize_dynamic_setting_args' );
2049      }
2050  
2051      /**
2052       * {@internal Missing Summary}
2053       *
2054       * See the {@see 'customize_dynamic_setting_args'} filter.
2055       *
2056       * @since 3.9.0
2057       * @deprecated 4.2.0 Deprecated in favor of the {@see 'customize_dynamic_setting_args'} filter.
2058       */
2059  	public function prepreview_added_widget_instance() {
2060          _deprecated_function( __METHOD__, '4.2.0', 'customize_dynamic_setting_args' );
2061      }
2062  
2063      /**
2064       * {@internal Missing Summary}
2065       *
2066       * See the {@see 'customize_dynamic_setting_args'} filter.
2067       *
2068       * @since 3.9.0
2069       * @deprecated 4.2.0 Deprecated in favor of the {@see 'customize_dynamic_setting_args'} filter.
2070       */
2071  	public function remove_prepreview_filters() {
2072          _deprecated_function( __METHOD__, '4.2.0', 'customize_dynamic_setting_args' );
2073      }
2074  }


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