class-wp-customize-nav-menus.php 48.4 KB
Newer Older
imac's avatar
imac committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396
<?php
/**
 * WordPress Customize Nav Menus classes
 *
 * @package WordPress
 * @subpackage Customize
 * @since 4.3.0
 */

/**
 * Customize Nav Menus class.
 *
 * Implements menu management in the Customizer.
 *
 * @since 4.3.0
 *
 * @see WP_Customize_Manager
 */
final class WP_Customize_Nav_Menus {

	/**
	 * WP_Customize_Manager instance.
	 *
	 * @since 4.3.0
	 * @access public
	 * @var WP_Customize_Manager
	 */
	public $manager;

	/**
	 * Previewed Menus.
	 *
	 * @since 4.3.0
	 * @access public
	 * @var array
	 */
	public $previewed_menus;

	/**
	 * Constructor.
	 *
	 * @since 4.3.0
	 * @access public
	 *
	 * @param object $manager An instance of the WP_Customize_Manager class.
	 */
	public function __construct( $manager ) {
		$this->previewed_menus = array();
		$this->manager         = $manager;

		// See https://github.com/xwp/wp-customize-snapshots/blob/962586659688a5b1fd9ae93618b7ce2d4e7a421c/php/class-customize-snapshot-manager.php#L469-L499
		add_action( 'customize_register', array( $this, 'customize_register' ), 11 );
		add_filter( 'customize_dynamic_setting_args', array( $this, 'filter_dynamic_setting_args' ), 10, 2 );
		add_filter( 'customize_dynamic_setting_class', array( $this, 'filter_dynamic_setting_class' ), 10, 3 );

		// Skip remaining hooks when the user can't manage nav menus anyway.
		if ( ! current_user_can( 'edit_theme_options' ) ) {
			return;
		}

		add_filter( 'customize_refresh_nonces', array( $this, 'filter_nonces' ) );
		add_action( 'wp_ajax_load-available-menu-items-customizer', array( $this, 'ajax_load_available_items' ) );
		add_action( 'wp_ajax_search-available-menu-items-customizer', array( $this, 'ajax_search_available_items' ) );
		add_action( 'wp_ajax_customize-nav-menus-insert-auto-draft', array( $this, 'ajax_insert_auto_draft_post' ) );
		add_action( 'customize_controls_enqueue_scripts', array( $this, 'enqueue_scripts' ) );
		add_action( 'customize_controls_print_footer_scripts', array( $this, 'print_templates' ) );
		add_action( 'customize_controls_print_footer_scripts', array( $this, 'available_items_template' ) );
		add_action( 'customize_preview_init', array( $this, 'customize_preview_init' ) );
		add_action( 'customize_preview_init', array( $this, 'make_auto_draft_status_previewable' ) );
		add_action( 'customize_save_nav_menus_created_posts', array( $this, 'save_nav_menus_created_posts' ) );

		// Selective Refresh partials.
		add_filter( 'customize_dynamic_partial_args', array( $this, 'customize_dynamic_partial_args' ), 10, 2 );
	}

	/**
	 * Adds a nonce for customizing menus.
	 *
	 * @since 4.5.0
	 * @access public
	 *
	 * @param array $nonces Array of nonces.
	 * @return array $nonces Modified array of nonces.
	 */
	public function filter_nonces( $nonces ) {
		$nonces['customize-menus'] = wp_create_nonce( 'customize-menus' );
		return $nonces;
	}

	/**
	 * Ajax handler for loading available menu items.
	 *
	 * @since 4.3.0
	 * @access public
	 */
	public function ajax_load_available_items() {
		check_ajax_referer( 'customize-menus', 'customize-menus-nonce' );

		if ( ! current_user_can( 'edit_theme_options' ) ) {
			wp_die( -1 );
		}

		$all_items = array();
		$item_types = array();
		if ( isset( $_POST['item_types'] ) && is_array( $_POST['item_types'] ) ) {
			$item_types = wp_unslash( $_POST['item_types'] );
		} elseif ( isset( $_POST['type'] ) && isset( $_POST['object'] ) ) { // Back compat.
			$item_types[] = array(
				'type' => wp_unslash( $_POST['type'] ),
				'object' => wp_unslash( $_POST['object'] ),
				'page' => empty( $_POST['page'] ) ? 0 : absint( $_POST['page'] ),
			);
		} else {
			wp_send_json_error( 'nav_menus_missing_type_or_object_parameter' );
		}

		foreach ( $item_types as $item_type ) {
			if ( empty( $item_type['type'] ) || empty( $item_type['object'] ) ) {
				wp_send_json_error( 'nav_menus_missing_type_or_object_parameter' );
			}
			$type = sanitize_key( $item_type['type'] );
			$object = sanitize_key( $item_type['object'] );
			$page = empty( $item_type['page'] ) ? 0 : absint( $item_type['page'] );
			$items = $this->load_available_items_query( $type, $object, $page );
			if ( is_wp_error( $items ) ) {
				wp_send_json_error( $items->get_error_code() );
			}
			$all_items[ $item_type['type'] . ':' . $item_type['object'] ] = $items;
		}

		wp_send_json_success( array( 'items' => $all_items ) );
	}

	/**
	 * Performs the post_type and taxonomy queries for loading available menu items.
	 *
	 * @since 4.3.0
	 * @access public
	 *
	 * @param string $type   Optional. Accepts any custom object type and has built-in support for
	 *                         'post_type' and 'taxonomy'. Default is 'post_type'.
	 * @param string $object Optional. Accepts any registered taxonomy or post type name. Default is 'page'.
	 * @param int    $page   Optional. The page number used to generate the query offset. Default is '0'.
	 * @return WP_Error|array Returns either a WP_Error object or an array of menu items.
	 */
	public function load_available_items_query( $type = 'post_type', $object = 'page', $page = 0 ) {
		$items = array();

		if ( 'post_type' === $type ) {
			$post_type = get_post_type_object( $object );
			if ( ! $post_type ) {
				return new WP_Error( 'nav_menus_invalid_post_type' );
			}

			if ( 0 === $page && 'page' === $object ) {
				// Add "Home" link. Treat as a page, but switch to custom on add.
				$items[] = array(
					'id'         => 'home',
					'title'      => _x( 'Home', 'nav menu home label' ),
					'type'       => 'custom',
					'type_label' => __( 'Custom Link' ),
					'object'     => '',
					'url'        => home_url(),
				);
			} elseif ( 'post' !== $object && 0 === $page && $post_type->has_archive ) {
				// Add a post type archive link.
				$items[] = array(
					'id'         => $object . '-archive',
					'title'      => $post_type->labels->archives,
					'type'       => 'post_type_archive',
					'type_label' => __( 'Post Type Archive' ),
					'object'     => $object,
					'url'        => get_post_type_archive_link( $object ),
				);
			}

			// Prepend posts with nav_menus_created_posts on first page.
			$posts = array();
			if ( 0 === $page && $this->manager->get_setting( 'nav_menus_created_posts' ) ) {
				foreach ( $this->manager->get_setting( 'nav_menus_created_posts' )->value() as $post_id ) {
					$auto_draft_post = get_post( $post_id );
					if ( $post_type->name === $auto_draft_post->post_type ) {
						$posts[] = $auto_draft_post;
					}
				}
			}

			$posts = array_merge( $posts, get_posts( array(
				'numberposts' => 10,
				'offset'      => 10 * $page,
				'orderby'     => 'date',
				'order'       => 'DESC',
				'post_type'   => $object,
			) ) );

			foreach ( $posts as $post ) {
				$post_title = $post->post_title;
				if ( '' === $post_title ) {
					/* translators: %d: ID of a post */
					$post_title = sprintf( __( '#%d (no title)' ), $post->ID );
				}
				$items[] = array(
					'id'         => "post-{$post->ID}",
					'title'      => html_entity_decode( $post_title, ENT_QUOTES, get_bloginfo( 'charset' ) ),
					'type'       => 'post_type',
					'type_label' => get_post_type_object( $post->post_type )->labels->singular_name,
					'object'     => $post->post_type,
					'object_id'  => intval( $post->ID ),
					'url'        => get_permalink( intval( $post->ID ) ),
				);
			}
		} elseif ( 'taxonomy' === $type ) {
			$terms = get_terms( $object, array(
				'child_of'     => 0,
				'exclude'      => '',
				'hide_empty'   => false,
				'hierarchical' => 1,
				'include'      => '',
				'number'       => 10,
				'offset'       => 10 * $page,
				'order'        => 'DESC',
				'orderby'      => 'count',
				'pad_counts'   => false,
			) );
			if ( is_wp_error( $terms ) ) {
				return $terms;
			}

			foreach ( $terms as $term ) {
				$items[] = array(
					'id'         => "term-{$term->term_id}",
					'title'      => html_entity_decode( $term->name, ENT_QUOTES, get_bloginfo( 'charset' ) ),
					'type'       => 'taxonomy',
					'type_label' => get_taxonomy( $term->taxonomy )->labels->singular_name,
					'object'     => $term->taxonomy,
					'object_id'  => intval( $term->term_id ),
					'url'        => get_term_link( intval( $term->term_id ), $term->taxonomy ),
				);
			}
		}

		/**
		 * Filters the available menu items.
		 *
		 * @since 4.3.0
		 *
		 * @param array  $items  The array of menu items.
		 * @param string $type   The object type.
		 * @param string $object The object name.
		 * @param int    $page   The current page number.
		 */
		$items = apply_filters( 'customize_nav_menu_available_items', $items, $type, $object, $page );

		return $items;
	}

	/**
	 * Ajax handler for searching available menu items.
	 *
	 * @since 4.3.0
	 * @access public
	 */
	public function ajax_search_available_items() {
		check_ajax_referer( 'customize-menus', 'customize-menus-nonce' );

		if ( ! current_user_can( 'edit_theme_options' ) ) {
			wp_die( -1 );
		}

		if ( empty( $_POST['search'] ) ) {
			wp_send_json_error( 'nav_menus_missing_search_parameter' );
		}

		$p = isset( $_POST['page'] ) ? absint( $_POST['page'] ) : 0;
		if ( $p < 1 ) {
			$p = 1;
		}

		$s = sanitize_text_field( wp_unslash( $_POST['search'] ) );
		$items = $this->search_available_items_query( array( 'pagenum' => $p, 's' => $s ) );

		if ( empty( $items ) ) {
			wp_send_json_error( array( 'message' => __( 'No results found.' ) ) );
		} else {
			wp_send_json_success( array( 'items' => $items ) );
		}
	}

	/**
	 * Performs post queries for available-item searching.
	 *
	 * Based on WP_Editor::wp_link_query().
	 *
	 * @since 4.3.0
	 * @access public
	 *
	 * @param array $args Optional. Accepts 'pagenum' and 's' (search) arguments.
	 * @return array Menu items.
	 */
	public function search_available_items_query( $args = array() ) {
		$items = array();

		$post_type_objects = get_post_types( array( 'show_in_nav_menus' => true ), 'objects' );
		$query = array(
			'post_type'              => array_keys( $post_type_objects ),
			'suppress_filters'       => true,
			'update_post_term_cache' => false,
			'update_post_meta_cache' => false,
			'post_status'            => 'publish',
			'posts_per_page'         => 20,
		);

		$args['pagenum'] = isset( $args['pagenum'] ) ? absint( $args['pagenum'] ) : 1;
		$query['offset'] = $args['pagenum'] > 1 ? $query['posts_per_page'] * ( $args['pagenum'] - 1 ) : 0;

		if ( isset( $args['s'] ) ) {
			$query['s'] = $args['s'];
		}

		$posts = array();

		// Prepend list of posts with nav_menus_created_posts search results on first page.
		$nav_menus_created_posts_setting = $this->manager->get_setting( 'nav_menus_created_posts' );
		if ( 1 === $args['pagenum'] && $nav_menus_created_posts_setting && count( $nav_menus_created_posts_setting ) > 0 ) {
			$stub_post_query = new WP_Query( array_merge(
				$query,
				array(
					'post_status' => 'auto-draft',
					'post__in' => $nav_menus_created_posts_setting->value(),
					'posts_per_page' => -1,
				)
			) );
			$posts = array_merge( $posts, $stub_post_query->posts );
		}

		// Query posts.
		$get_posts = new WP_Query( $query );
		$posts = array_merge( $posts, $get_posts->posts );

		// Create items for posts.
		foreach ( $posts as $post ) {
			$post_title = $post->post_title;
			if ( '' === $post_title ) {
				/* translators: %d: ID of a post */
				$post_title = sprintf( __( '#%d (no title)' ), $post->ID );
			}
			$items[] = array(
				'id'         => 'post-' . $post->ID,
				'title'      => html_entity_decode( $post_title, ENT_QUOTES, get_bloginfo( 'charset' ) ),
				'type'       => 'post_type',
				'type_label' => $post_type_objects[ $post->post_type ]->labels->singular_name,
				'object'     => $post->post_type,
				'object_id'  => intval( $post->ID ),
				'url'        => get_permalink( intval( $post->ID ) ),
			);
		}

		// Query taxonomy terms.
		$taxonomies = get_taxonomies( array( 'show_in_nav_menus' => true ), 'names' );
		$terms = get_terms( $taxonomies, array(
			'name__like' => $args['s'],
			'number'     => 20,
			'offset'     => 20 * ($args['pagenum'] - 1),
		) );

		// Check if any taxonomies were found.
		if ( ! empty( $terms ) ) {
			foreach ( $terms as $term ) {
				$items[] = array(
					'id'         => 'term-' . $term->term_id,
					'title'      => html_entity_decode( $term->name, ENT_QUOTES, get_bloginfo( 'charset' ) ),
					'type'       => 'taxonomy',
					'type_label' => get_taxonomy( $term->taxonomy )->labels->singular_name,
					'object'     => $term->taxonomy,
					'object_id'  => intval( $term->term_id ),
					'url'        => get_term_link( intval( $term->term_id ), $term->taxonomy ),
				);
			}
		}

		/**
		 * Filters the available menu items during a search request.
		 *
		 * @since 4.5.0
		 *
		 * @param array $items The array of menu items.
		 * @param array $args  Includes 'pagenum' and 's' (search) arguments.
		 */
		$items = apply_filters( 'customize_nav_menu_searched_items', $items, $args );

		return $items;
	}

	/**
	 * Enqueue scripts and styles for Customizer pane.
	 *
	 * @since 4.3.0
	 * @access public
	 */
	public function enqueue_scripts() {
		wp_enqueue_style( 'customize-nav-menus' );
		wp_enqueue_script( 'customize-nav-menus' );

		$temp_nav_menu_setting      = new WP_Customize_Nav_Menu_Setting( $this->manager, 'nav_menu[-1]' );
		$temp_nav_menu_item_setting = new WP_Customize_Nav_Menu_Item_Setting( $this->manager, 'nav_menu_item[-1]' );

		// Pass data to JS.
		$settings = array(
			'allMenus'             => wp_get_nav_menus(),
			'itemTypes'            => $this->available_item_types(),
			'l10n'                 => array(
				'untitled'          => _x( '(no label)', 'missing menu item navigation label' ),
				'unnamed'           => _x( '(unnamed)', 'Missing menu name.' ),
				'custom_label'      => __( 'Custom Link' ),
				'page_label'        => get_post_type_object( 'page' )->labels->singular_name,
				/* translators: %s: menu location */
				'menuLocation'      => _x( '(Currently set to: %s)', 'menu' ),
				'menuNameLabel'     => __( 'Menu Name' ),
				'itemAdded'         => __( 'Menu item added' ),
				'itemDeleted'       => __( 'Menu item deleted' ),
				'menuAdded'         => __( 'Menu created' ),
				'menuDeleted'       => __( 'Menu deleted' ),
				'movedUp'           => __( 'Menu item moved up' ),
				'movedDown'         => __( 'Menu item moved down' ),
				'movedLeft'         => __( 'Menu item moved out of submenu' ),
				'movedRight'        => __( 'Menu item is now a sub-item' ),
				/* translators: &#9656; is the unicode right-pointing triangle, and %s is the section title in the Customizer */
				'customizingMenus'  => sprintf( __( 'Customizing &#9656; %s' ), esc_html( $this->manager->get_panel( 'nav_menus' )->title ) ),
				/* translators: %s: title of menu item which is invalid */
				'invalidTitleTpl'   => __( '%s (Invalid)' ),
				/* translators: %s: title of menu item in draft status */
				'pendingTitleTpl'   => __( '%s (Pending)' ),
				'itemsFound'        => __( 'Number of items found: %d' ),
				'itemsFoundMore'    => __( 'Additional items found: %d' ),
				'itemsLoadingMore'  => __( 'Loading more results... please wait.' ),
				'reorderModeOn'     => __( 'Reorder mode enabled' ),
				'reorderModeOff'    => __( 'Reorder mode closed' ),
				'reorderLabelOn'    => esc_attr__( 'Reorder menu items' ),
				'reorderLabelOff'   => esc_attr__( 'Close reorder mode' ),
			),
			'settingTransport'     => 'postMessage',
			'phpIntMax'            => PHP_INT_MAX,
			'defaultSettingValues' => array(
				'nav_menu'      => $temp_nav_menu_setting->default,
				'nav_menu_item' => $temp_nav_menu_item_setting->default,
			),
			'locationSlugMappedToName' => get_registered_nav_menus(),
		);

		$data = sprintf( 'var _wpCustomizeNavMenusSettings = %s;', wp_json_encode( $settings ) );
		wp_scripts()->add_data( 'customize-nav-menus', 'data', $data );

		// This is copied from nav-menus.php, and it has an unfortunate object name of `menus`.
		$nav_menus_l10n = array(
			'oneThemeLocationNoMenus' => null,
			'moveUp'       => __( 'Move up one' ),
			'moveDown'     => __( 'Move down one' ),
			'moveToTop'    => __( 'Move to the top' ),
			/* translators: %s: previous item name */
			'moveUnder'    => __( 'Move under %s' ),
			/* translators: %s: previous item name */
			'moveOutFrom'  => __( 'Move out from under %s' ),
			/* translators: %s: previous item name */
			'under'        => __( 'Under %s' ),
			/* translators: %s: previous item name */
			'outFrom'      => __( 'Out from under %s' ),
			/* translators: 1: item name, 2: item position, 3: total number of items */
			'menuFocus'    => __( '%1$s. Menu item %2$d of %3$d.' ),
			/* translators: 1: item name, 2: item position, 3: parent item name */
			'subMenuFocus' => __( '%1$s. Sub item number %2$d under %3$s.' ),
		);
		wp_localize_script( 'nav-menu', 'menus', $nav_menus_l10n );
	}

	/**
	 * Filters a dynamic setting's constructor args.
	 *
	 * For a dynamic setting to be registered, this filter must be employed
	 * to override the default false value with an array of args to pass to
	 * the WP_Customize_Setting constructor.
	 *
	 * @since 4.3.0
	 * @access public
	 *
	 * @param false|array $setting_args The arguments to the WP_Customize_Setting constructor.
	 * @param string      $setting_id   ID for dynamic setting, usually coming from `$_POST['customized']`.
	 * @return array|false
	 */
	public function filter_dynamic_setting_args( $setting_args, $setting_id ) {
		if ( preg_match( WP_Customize_Nav_Menu_Setting::ID_PATTERN, $setting_id ) ) {
			$setting_args = array(
				'type'      => WP_Customize_Nav_Menu_Setting::TYPE,
				'transport' => 'postMessage',
			);
		} elseif ( preg_match( WP_Customize_Nav_Menu_Item_Setting::ID_PATTERN, $setting_id ) ) {
			$setting_args = array(
				'type'      => WP_Customize_Nav_Menu_Item_Setting::TYPE,
				'transport' => 'postMessage',
			);
		}
		return $setting_args;
	}

	/**
	 * Allow non-statically created settings to be constructed with custom WP_Customize_Setting subclass.
	 *
	 * @since 4.3.0
	 * @access public
	 *
	 * @param string $setting_class WP_Customize_Setting or a subclass.
	 * @param string $setting_id    ID for dynamic setting, usually coming from `$_POST['customized']`.
	 * @param array  $setting_args  WP_Customize_Setting or a subclass.
	 * @return string
	 */
	public function filter_dynamic_setting_class( $setting_class, $setting_id, $setting_args ) {
		unset( $setting_id );

		if ( ! empty( $setting_args['type'] ) && WP_Customize_Nav_Menu_Setting::TYPE === $setting_args['type'] ) {
			$setting_class = 'WP_Customize_Nav_Menu_Setting';
		} elseif ( ! empty( $setting_args['type'] ) && WP_Customize_Nav_Menu_Item_Setting::TYPE === $setting_args['type'] ) {
			$setting_class = 'WP_Customize_Nav_Menu_Item_Setting';
		}
		return $setting_class;
	}

	/**
	 * Add the customizer settings and controls.
	 *
	 * @since 4.3.0
	 * @access public
	 */
	public function customize_register() {

		// Preview settings for nav menus early so that the sections and controls will be added properly.
		$nav_menus_setting_ids = array();
		foreach ( array_keys( $this->manager->unsanitized_post_values() ) as $setting_id ) {
			if ( preg_match( '/^(nav_menu_locations|nav_menu|nav_menu_item)\[/', $setting_id ) ) {
				$nav_menus_setting_ids[] = $setting_id;
			}
		}
		$this->manager->add_dynamic_settings( $nav_menus_setting_ids );
		if ( ! $this->manager->doing_ajax( 'customize_save' ) ) {
			foreach ( $nav_menus_setting_ids as $setting_id ) {
				$setting = $this->manager->get_setting( $setting_id );
				if ( $setting ) {
					$setting->preview();
				}
			}
		}

		// Require JS-rendered control types.
		$this->manager->register_panel_type( 'WP_Customize_Nav_Menus_Panel' );
		$this->manager->register_control_type( 'WP_Customize_Nav_Menu_Control' );
		$this->manager->register_control_type( 'WP_Customize_Nav_Menu_Name_Control' );
		$this->manager->register_control_type( 'WP_Customize_Nav_Menu_Auto_Add_Control' );
		$this->manager->register_control_type( 'WP_Customize_Nav_Menu_Item_Control' );

		// Create a panel for Menus.
		$description = '<p>' . __( 'This panel is used for managing navigation menus for content you have already published on your site. You can create menus and add items for existing content such as pages, posts, categories, tags, formats, or custom links.' ) . '</p>';
		if ( current_theme_supports( 'widgets' ) ) {
			/* translators: URL to the widgets panel of the customizer */
			$description .= '<p>' . sprintf( __( 'Menus can be displayed in locations defined by your theme or in <a href="%s">widget areas</a> by adding a &#8220;Custom Menu&#8221; widget.' ), "javascript:wp.customize.panel( 'widgets' ).focus();" ) . '</p>';
		} else {
			$description .= '<p>' . __( 'Menus can be displayed in locations defined by your theme.' ) . '</p>';
		}
		$this->manager->add_panel( new WP_Customize_Nav_Menus_Panel( $this->manager, 'nav_menus', array(
			'title'       => __( 'Menus' ),
			'description' => $description,
			'priority'    => 100,
			// 'theme_supports' => 'menus|widgets', @todo allow multiple theme supports
		) ) );
		$menus = wp_get_nav_menus();

		// Menu locations.
		$locations     = get_registered_nav_menus();
		$num_locations = count( array_keys( $locations ) );
		if ( 1 == $num_locations ) {
			$description = '<p>' . __( 'Your theme supports one menu. Select which menu you would like to use.' ) . '</p>';
		} else {
			/* translators: %s: number of menu locations */
			$description = '<p>' . sprintf( _n( 'Your theme supports %s menu. Select which menu appears in each location.', 'Your theme supports %s menus. Select which menu appears in each location.', $num_locations ), number_format_i18n( $num_locations ) ) . '</p>';
		}
		if ( current_theme_supports( 'widgets' ) ) {
			/* translators: URL to the widgets panel of the customizer */
			$description .= '<p>' . sprintf( __( 'You can also place menus in <a href="%s">widget areas</a> with the &#8220;Custom Menu&#8221; widget.' ), "javascript:wp.customize.panel( 'widgets' ).focus();" ) . '</p>';
		}

		$this->manager->add_section( 'menu_locations', array(
			'title'       => __( 'Menu Locations' ),
			'panel'       => 'nav_menus',
			'priority'    => 5,
			'description' => $description,
		) );

		$choices = array( '0' => __( '&mdash; Select &mdash;' ) );
		foreach ( $menus as $menu ) {
			$choices[ $menu->term_id ] = wp_html_excerpt( $menu->name, 40, '&hellip;' );
		}

		foreach ( $locations as $location => $description ) {
			$setting_id = "nav_menu_locations[{$location}]";

			$setting = $this->manager->get_setting( $setting_id );
			if ( $setting ) {
				$setting->transport = 'postMessage';
				remove_filter( "customize_sanitize_{$setting_id}", 'absint' );
				add_filter( "customize_sanitize_{$setting_id}", array( $this, 'intval_base10' ) );
			} else {
				$this->manager->add_setting( $setting_id, array(
					'sanitize_callback' => array( $this, 'intval_base10' ),
					'theme_supports'    => 'menus',
					'type'              => 'theme_mod',
					'transport'         => 'postMessage',
					'default'           => 0,
				) );
			}

			$this->manager->add_control( new WP_Customize_Nav_Menu_Location_Control( $this->manager, $setting_id, array(
				'label'       => $description,
				'location_id' => $location,
				'section'     => 'menu_locations',
				'choices'     => $choices,
			) ) );
		}

		// Register each menu as a Customizer section, and add each menu item to each menu.
		foreach ( $menus as $menu ) {
			$menu_id = $menu->term_id;

			// Create a section for each menu.
			$section_id = 'nav_menu[' . $menu_id . ']';
			$this->manager->add_section( new WP_Customize_Nav_Menu_Section( $this->manager, $section_id, array(
				'title'     => html_entity_decode( $menu->name, ENT_QUOTES, get_bloginfo( 'charset' ) ),
				'priority'  => 10,
				'panel'     => 'nav_menus',
			) ) );

			$nav_menu_setting_id = 'nav_menu[' . $menu_id . ']';
			$this->manager->add_setting( new WP_Customize_Nav_Menu_Setting( $this->manager, $nav_menu_setting_id, array(
				'transport' => 'postMessage',
			) ) );

			// Add the menu contents.
			$menu_items = (array) wp_get_nav_menu_items( $menu_id );

			foreach ( array_values( $menu_items ) as $i => $item ) {

				// Create a setting for each menu item (which doesn't actually manage data, currently).
				$menu_item_setting_id = 'nav_menu_item[' . $item->ID . ']';

				$value = (array) $item;
				if ( empty( $value['post_title'] ) ) {
					$value['title'] = '';
				}

				$value['nav_menu_term_id'] = $menu_id;
				$this->manager->add_setting( new WP_Customize_Nav_Menu_Item_Setting( $this->manager, $menu_item_setting_id, array(
					'value'     => $value,
					'transport' => 'postMessage',
				) ) );

				// Create a control for each menu item.
				$this->manager->add_control( new WP_Customize_Nav_Menu_Item_Control( $this->manager, $menu_item_setting_id, array(
					'label'    => $item->title,
					'section'  => $section_id,
					'priority' => 10 + $i,
				) ) );
			}

			// Note: other controls inside of this section get added dynamically in JS via the MenuSection.ready() function.
		}

		// Add the add-new-menu section and controls.
		$this->manager->add_section( new WP_Customize_New_Menu_Section( $this->manager, 'add_menu', array(
			'title'    => __( 'Add a Menu' ),
			'panel'    => 'nav_menus',
			'priority' => 999,
		) ) );

		$this->manager->add_control( 'new_menu_name', array(
			'label'       => '',
			'section'     => 'add_menu',
			'type'        => 'text',
			'settings'    => array(),
			'input_attrs' => array(
				'class'       => 'menu-name-field',
				'placeholder' => __( 'New menu name' ),
			),
		) );

		$this->manager->add_control( new WP_Customize_New_Menu_Control( $this->manager, 'create_new_menu', array(
			'section'  => 'add_menu',
			'settings' => array(),
		) ) );

		$this->manager->add_setting( new WP_Customize_Filter_Setting( $this->manager, 'nav_menus_created_posts', array(
			'transport' => 'postMessage',
			'type' => 'option', // To prevent theme prefix in changeset.
			'default' => array(),
			'sanitize_callback' => array( $this, 'sanitize_nav_menus_created_posts' ),
		) ) );
	}

	/**
	 * Get the base10 intval.
	 *
	 * This is used as a setting's sanitize_callback; we can't use just plain
	 * intval because the second argument is not what intval() expects.
	 *
	 * @since 4.3.0
	 * @access public
	 *
	 * @param mixed $value Number to convert.
	 * @return int Integer.
	 */
	public function intval_base10( $value ) {
		return intval( $value, 10 );
	}

	/**
	 * Return an array of all the available item types.
	 *
	 * @since 4.3.0
	 * @since 4.7.0  Each array item now includes a `$type_label` in in addition to `$title`, `$type`, and `$object`.
	 * @access public
	 *
	 * @return array The available menu item types.
	 */
	public function available_item_types() {
		$item_types = array();

		$post_types = get_post_types( array( 'show_in_nav_menus' => true ), 'objects' );
		if ( $post_types ) {
			foreach ( $post_types as $slug => $post_type ) {
				$item_types[] = array(
					'title'  => $post_type->labels->name,
					'type_label' => $post_type->labels->singular_name,
					'type' => 'post_type',
					'object' => $post_type->name,
				);
			}
		}

		$taxonomies = get_taxonomies( array( 'show_in_nav_menus' => true ), 'objects' );
		if ( $taxonomies ) {
			foreach ( $taxonomies as $slug => $taxonomy ) {
				if ( 'post_format' === $taxonomy && ! current_theme_supports( 'post-formats' ) ) {
					continue;
				}
				$item_types[] = array(
					'title' => $taxonomy->labels->name,
					'type_label' => $taxonomy->labels->singular_name,
					'type' => 'taxonomy',
					'object' => $taxonomy->name,
				);
			}
		}

		/**
		 * Filters the available menu item types.
		 *
		 * @since 4.3.0
		 * @since 4.7.0  Each array item now includes a `$type_label` in in addition to `$title`, `$type`, and `$object`.
		 *
		 * @param array $item_types Custom menu item types.
		 */
		$item_types = apply_filters( 'customize_nav_menu_available_item_types', $item_types );

		return $item_types;
	}

	/**
	 * Add a new `auto-draft` post.
	 *
	 * @access public
	 * @since 4.7.0
	 *
	 * @param array $postarr {
	 *     Post array. Note that post_status is overridden to be `auto-draft`.
	 *
	 *     @var string $post_title   Post title. Required.
	 *     @var string $post_type    Post type. Required.
	 *     @var string $post_name    Post name.
	 *     @var string $post_content Post content.
	 * }
	 * @return WP_Post|WP_Error Inserted auto-draft post object or error.
	 */
	public function insert_auto_draft_post( $postarr ) {
		if ( ! isset( $postarr['post_type'] ) ) {
			return new WP_Error( 'unknown_post_type', __( 'Invalid post type.' ) );
		}
		if ( empty( $postarr['post_title'] ) ) {
			return new WP_Error( 'empty_title', __( 'Empty title' ) );
		}
		if ( ! empty( $postarr['post_status'] ) ) {
			return new WP_Error( 'status_forbidden', __( 'Status is forbidden' ) );
		}

		$postarr['post_status'] = 'auto-draft';

		// Auto-drafts are allowed to have empty post_names, so it has to be explicitly set.
		if ( empty( $postarr['post_name'] ) ) {
			$postarr['post_name'] = sanitize_title( $postarr['post_title'] );
		}
		if ( ! isset( $postarr['meta_input'] ) ) {
			$postarr['meta_input'] = array();
		}
		$postarr['meta_input']['_customize_draft_post_name'] = $postarr['post_name'];
		unset( $postarr['post_name'] );

		add_filter( 'wp_insert_post_empty_content', '__return_false', 1000 );
		$r = wp_insert_post( wp_slash( $postarr ), true );
		remove_filter( 'wp_insert_post_empty_content', '__return_false', 1000 );

		if ( is_wp_error( $r ) ) {
			return $r;
		} else {
			return get_post( $r );
		}
	}

	/**
	 * Ajax handler for adding a new auto-draft post.
	 *
	 * @access public
	 * @since 4.7.0
	 */
	public function ajax_insert_auto_draft_post() {
		if ( ! check_ajax_referer( 'customize-menus', 'customize-menus-nonce', false ) ) {
			wp_send_json_error( 'bad_nonce', 400 );
		}

		if ( ! current_user_can( 'customize' ) ) {
			wp_send_json_error( 'customize_not_allowed', 403 );
		}

		if ( empty( $_POST['params'] ) || ! is_array( $_POST['params'] ) ) {
			wp_send_json_error( 'missing_params', 400 );
		}

		$params = wp_unslash( $_POST['params'] );
		$illegal_params = array_diff( array_keys( $params ), array( 'post_type', 'post_title' ) );
		if ( ! empty( $illegal_params ) ) {
			wp_send_json_error( 'illegal_params', 400 );
		}

		$params = array_merge(
			array(
				'post_type' => '',
				'post_title' => '',
			),
			$params
		);

		if ( empty( $params['post_type'] ) || ! post_type_exists( $params['post_type'] ) ) {
			status_header( 400 );
			wp_send_json_error( 'missing_post_type_param' );
		}

		$post_type_object = get_post_type_object( $params['post_type'] );
		if ( ! current_user_can( $post_type_object->cap->create_posts ) || ! current_user_can( $post_type_object->cap->publish_posts ) ) {
			status_header( 403 );
			wp_send_json_error( 'insufficient_post_permissions' );
		}

		$params['post_title'] = trim( $params['post_title'] );
		if ( '' === $params['post_title'] ) {
			status_header( 400 );
			wp_send_json_error( 'missing_post_title' );
		}

		$r = $this->insert_auto_draft_post( $params );
		if ( is_wp_error( $r ) ) {
			$error = $r;
			if ( ! empty( $post_type_object->labels->singular_name ) ) {
				$singular_name = $post_type_object->labels->singular_name;
			} else {
				$singular_name = __( 'Post' );
			}

			$data = array(
				/* translators: %1$s is the post type name and %2$s is the error message. */
				'message' => sprintf( __( '%1$s could not be created: %2$s' ), $singular_name, $error->get_error_message() ),
			);
			wp_send_json_error( $data );
		} else {
			$post = $r;
			$data = array(
				'post_id' => $post->ID,
				'url'     => get_permalink( $post->ID ),
			);
			wp_send_json_success( $data );
		}
	}

	/**
	 * Print the JavaScript templates used to render Menu Customizer components.
	 *
	 * Templates are imported into the JS use wp.template.
	 *
	 * @since 4.3.0
	 * @access public
	 */
	public function print_templates() {
		?>
		<script type="text/html" id="tmpl-available-menu-item">
			<li id="menu-item-tpl-{{ data.id }}" class="menu-item-tpl" data-menu-item-id="{{ data.id }}">
				<div class="menu-item-bar">
					<div class="menu-item-handle">
						<span class="item-type" aria-hidden="true">{{ data.type_label }}</span>
						<span class="item-title" aria-hidden="true">
							<span class="menu-item-title<# if ( ! data.title ) { #> no-title<# } #>">{{ data.title || wp.customize.Menus.data.l10n.untitled }}</span>
						</span>
						<button type="button" class="button-link item-add">
							<span class="screen-reader-text"><?php
								/* translators: 1: Title of a menu item, 2: Type of a menu item */
								printf( __( 'Add to menu: %1$s (%2$s)' ), '{{ data.title || wp.customize.Menus.data.l10n.untitled }}', '{{ data.type_label }}' );
							?></span>
						</button>
					</div>
				</div>
			</li>
		</script>

		<script type="text/html" id="tmpl-menu-item-reorder-nav">
			<div class="menu-item-reorder-nav">
				<?php
				printf(
					'<button type="button" class="menus-move-up">%1$s</button><button type="button" class="menus-move-down">%2$s</button><button type="button" class="menus-move-left">%3$s</button><button type="button" class="menus-move-right">%4$s</button>',
					__( 'Move up' ),
					__( 'Move down' ),
					__( 'Move one level up' ),
					__( 'Move one level down' )
				);
				?>
			</div>
		</script>
	<?php
	}

	/**
	 * Print the html template used to render the add-menu-item frame.
	 *
	 * @since 4.3.0
	 * @access public
	 */
	public function available_items_template() {
		?>
		<div id="available-menu-items" class="accordion-container">
			<div class="customize-section-title">
				<button type="button" class="customize-section-back" tabindex="-1">
					<span class="screen-reader-text"><?php _e( 'Back' ); ?></span>
				</button>
				<h3>
					<span class="customize-action">
						<?php
							/* translators: &#9656; is the unicode right-pointing triangle, and %s is the section title in the Customizer */
							printf( __( 'Customizing &#9656; %s' ), esc_html( $this->manager->get_panel( 'nav_menus' )->title ) );
						?>
					</span>
					<?php _e( 'Add Menu Items' ); ?>
				</h3>
			</div>
			<div id="available-menu-items-search" class="accordion-section cannot-expand">
				<div class="accordion-section-title">
					<label class="screen-reader-text" for="menu-items-search"><?php _e( 'Search Menu Items' ); ?></label>
					<input type="text" id="menu-items-search" placeholder="<?php esc_attr_e( 'Search menu items&hellip;' ) ?>" aria-describedby="menu-items-search-desc" />
					<p class="screen-reader-text" id="menu-items-search-desc"><?php _e( 'The search results will be updated as you type.' ); ?></p>
					<span class="spinner"></span>
				</div>
				<div class="search-icon" aria-hidden="true"></div>
				<button type="button" class="clear-results"><span class="screen-reader-text"><?php _e( 'Clear Results' ); ?></span></button>
				<ul class="accordion-section-content available-menu-items-list" data-type="search"></ul>
			</div>
			<?php

			// Ensure the page post type comes first in the list.
			$item_types = $this->available_item_types();
			$page_item_type = null;
			foreach ( $item_types as $i => $item_type ) {
				if ( isset( $item_type['object'] ) && 'page' === $item_type['object'] ) {
					$page_item_type = $item_type;
					unset( $item_types[ $i ] );
				}
			}

			$this->print_custom_links_available_menu_item();
			if ( $page_item_type ) {
				$this->print_post_type_container( $page_item_type );
			}
			// Containers for per-post-type item browsing; items are added with JS.
			foreach ( $item_types as $item_type ) {
				$this->print_post_type_container( $item_type );
			}
			?>
		</div><!-- #available-menu-items -->
	<?php
	}

	/**
	 * Print the markup for new menu items.
	 *
	 * To be used in the template #available-menu-items.
	 *
	 * @since 4.7.0
	 * @access private
	 *
	 * @param array $available_item_type Menu item data to output, including title, type, and label.
	 * @return void
	 */
	protected function print_post_type_container( $available_item_type ) {
		$id = sprintf( 'available-menu-items-%s-%s', $available_item_type['type'], $available_item_type['object'] );
		?>
		<div id="<?php echo esc_attr( $id ); ?>" class="accordion-section">
			<h4 class="accordion-section-title" role="presentation">
				<?php echo esc_html( $available_item_type['title'] ); ?>
				<span class="spinner"></span>
				<span class="no-items"><?php _e( 'No items' ); ?></span>
				<button type="button" class="button-link" aria-expanded="false">
					<span class="screen-reader-text"><?php
						/* translators: %s: Title of a section with menu items */
						printf( __( 'Toggle section: %s' ), esc_html( $available_item_type['title'] ) ); ?></span>
					<span class="toggle-indicator" aria-hidden="true"></span>
				</button>
			</h4>
			<div class="accordion-section-content">
				<?php if ( 'post_type' === $available_item_type['type'] ) : ?>
					<?php $post_type_obj = get_post_type_object( $available_item_type['object'] ); ?>
					<?php if ( current_user_can( $post_type_obj->cap->create_posts ) && current_user_can( $post_type_obj->cap->publish_posts ) ) : ?>
						<div class="new-content-item">
							<input type="text" class="create-item-input" placeholder="<?php echo esc_attr( $post_type_obj->labels->add_new_item ); ?>">
							<button type="button" class="button add-content"><?php _e( 'Add' ); ?></button>
						</div>
					<?php endif; ?>
				<?php endif; ?>
				<ul class="available-menu-items-list" data-type="<?php echo esc_attr( $available_item_type['type'] ); ?>" data-object="<?php echo esc_attr( $available_item_type['object'] ); ?>" data-type_label="<?php echo esc_attr( isset( $available_item_type['type_label'] ) ? $available_item_type['type_label'] : $available_item_type['type'] ); ?>"></ul>
			</div>
		</div>
		<?php
	}

	/**
	 * Print the markup for available menu item custom links.
	 *
	 * @since 4.7.0
	 * @access private
	 *
	 * @return void
	 */
	protected function print_custom_links_available_menu_item() {
		?>
		<div id="new-custom-menu-item" class="accordion-section">
			<h4 class="accordion-section-title" role="presentation">
				<?php _e( 'Custom Links' ); ?>
				<button type="button" class="button-link" aria-expanded="false">
					<span class="screen-reader-text"><?php _e( 'Toggle section: Custom Links' ); ?></span>
					<span class="toggle-indicator" aria-hidden="true"></span>
				</button>
			</h4>
			<div class="accordion-section-content customlinkdiv">
				<input type="hidden" value="custom" id="custom-menu-item-type" name="menu-item[-1][menu-item-type]" />
				<p id="menu-item-url-wrap" class="wp-clearfix">
					<label class="howto" for="custom-menu-item-url"><?php _e( 'URL' ); ?></label>
					<input id="custom-menu-item-url" name="menu-item[-1][menu-item-url]" type="text" class="code menu-item-textbox" value="http://">
				</p>
				<p id="menu-item-name-wrap" class="wp-clearfix">
					<label class="howto" for="custom-menu-item-name"><?php _e( 'Link Text' ); ?></label>
					<input id="custom-menu-item-name" name="menu-item[-1][menu-item-title]" type="text" class="regular-text menu-item-textbox">
				</p>
				<p class="button-controls">
					<span class="add-to-menu">
						<input type="submit" class="button submit-add-to-menu right" value="<?php esc_attr_e( 'Add to Menu' ); ?>" name="add-custom-menu-item" id="custom-menu-item-submit">
						<span class="spinner"></span>
					</span>
				</p>
			</div>
		</div>
		<?php
	}

	//
	// Start functionality specific to partial-refresh of menu changes in Customizer preview.
	//

	/**
	 * Nav menu args used for each instance, keyed by the args HMAC.
	 *
	 * @since 4.3.0
	 * @access public
	 * @var array
	 */
	public $preview_nav_menu_instance_args = array();

	/**
	 * Filters arguments for dynamic nav_menu selective refresh partials.
	 *
	 * @since 4.5.0
	 * @access public
	 *
	 * @param array|false $partial_args Partial args.
	 * @param string      $partial_id   Partial ID.
	 * @return array Partial args.
	 */
	public function customize_dynamic_partial_args( $partial_args, $partial_id ) {

		if ( preg_match( '/^nav_menu_instance\[[0-9a-f]{32}\]$/', $partial_id ) ) {
			if ( false === $partial_args ) {
				$partial_args = array();
			}
			$partial_args = array_merge(
				$partial_args,
				array(
					'type'                => 'nav_menu_instance',
					'render_callback'     => array( $this, 'render_nav_menu_partial' ),
					'container_inclusive' => true,
					'settings'            => array(), // Empty because the nav menu instance may relate to a menu or a location.
					'capability'          => 'edit_theme_options',
				)
			);
		}

		return $partial_args;
	}

	/**
	 * Add hooks for the Customizer preview.
	 *
	 * @since 4.3.0
	 * @access public
	 */
	public function customize_preview_init() {
		add_action( 'wp_enqueue_scripts', array( $this, 'customize_preview_enqueue_deps' ) );
		add_filter( 'wp_nav_menu_args', array( $this, 'filter_wp_nav_menu_args' ), 1000 );
		add_filter( 'wp_nav_menu', array( $this, 'filter_wp_nav_menu' ), 10, 2 );
		add_filter( 'wp_footer', array( $this, 'export_preview_data' ), 1 );
		add_filter( 'customize_render_partials_response', array( $this, 'export_partial_rendered_nav_menu_instances' ) );
	}

	/**
	 * Make the auto-draft status protected so that it can be queried.
	 *
	 * @since 4.7.0
	 * @access public
	 */
	public function make_auto_draft_status_previewable() {
		global $wp_post_statuses;
		$wp_post_statuses['auto-draft']->protected = true;
	}

	/**
	 * Sanitize post IDs for auto-draft posts created for nav menu items to be published.
	 *
	 * @since 4.7.0
	 * @access public
	 *
	 * @param array $value Post IDs.
	 * @returns array Post IDs.
	 */
	public function sanitize_nav_menus_created_posts( $value ) {
		$post_ids = array();
		foreach ( wp_parse_id_list( $value ) as $post_id ) {
			if ( empty( $post_id ) ) {
				continue;
			}
			$post = get_post( $post_id );
			if ( 'auto-draft' !== $post->post_status ) {
				continue;
			}
			$post_type_obj = get_post_type_object( $post->post_type );
			if ( ! $post_type_obj ) {
				continue;
			}
			if ( ! current_user_can( $post_type_obj->cap->publish_posts ) || ! current_user_can( $post_type_obj->cap->edit_post, $post_id ) ) {
				continue;
			}
			$post_ids[] = $post->ID;
		}
		return $post_ids;
	}

	/**
	 * Publish the auto-draft posts that were created for nav menu items.
	 *
	 * The post IDs will have been sanitized by already by
	 * `WP_Customize_Nav_Menu_Items::sanitize_nav_menus_created_posts()` to
	 * remove any post IDs for which the user cannot publish or for which the
	 * post is not an auto-draft.
	 *
	 * @since 4.7.0
	 * @access public
	 *
	 * @param WP_Customize_Setting $setting Customizer setting object.
	 */
	public function save_nav_menus_created_posts( $setting ) {
		$post_ids = $setting->post_value();
		if ( ! empty( $post_ids ) ) {
			foreach ( $post_ids as $post_id ) {
				$target_status = 'attachment' === get_post_type( $post_id ) ? 'inherit' : 'publish';
				$args = array(
					'ID' => $post_id,
					'post_status' => $target_status,
				);
				$post_name = get_post_meta( $post_id, '_customize_draft_post_name', true );
				if ( $post_name ) {
					$args['post_name'] = $post_name;
				}

				// Note that wp_publish_post() cannot be used because unique slugs need to be assigned.
				wp_update_post( wp_slash( $args ) );

				delete_post_meta( $post_id, '_customize_draft_post_name' );
			}
		}
	}

	/**
	 * Keep track of the arguments that are being passed to wp_nav_menu().
	 *
	 * @since 4.3.0
	 * @access public
	 * @see wp_nav_menu()
	 * @see WP_Customize_Widgets_Partial_Refresh::filter_dynamic_sidebar_params()
	 *
	 * @param array $args An array containing wp_nav_menu() arguments.
	 * @return array Arguments.
	 */
	public function filter_wp_nav_menu_args( $args ) {
		/*
		 * The following conditions determine whether or not this instance of
		 * wp_nav_menu() can use selective refreshed. A wp_nav_menu() can be
		 * selective refreshed if...
		 */
		$can_partial_refresh = (
			// ...if wp_nav_menu() is directly echoing out the menu (and thus isn't manipulating the string after generated),
			! empty( $args['echo'] )
			&&
			// ...and if the fallback_cb can be serialized to JSON, since it will be included in the placement context data,
			( empty( $args['fallback_cb'] ) || is_string( $args['fallback_cb'] ) )
			&&
			// ...and if the walker can also be serialized to JSON, since it will be included in the placement context data as well,
			( empty( $args['walker'] ) || is_string( $args['walker'] ) )
			// ...and if it has a theme location assigned or an assigned menu to display,
			&& (
				! empty( $args['theme_location'] )
				||
				( ! empty( $args['menu'] ) && ( is_numeric( $args['menu'] ) || is_object( $args['menu'] ) ) )
			)
			&&
			// ...and if the nav menu would be rendered with a wrapper container element (upon which to attach data-* attributes).
			(
				! empty( $args['container'] )
				||
				( isset( $args['items_wrap'] ) && '<' === substr( $args['items_wrap'], 0, 1 ) )
			)
		);
		$args['can_partial_refresh'] = $can_partial_refresh;

		$exported_args = $args;

		// Empty out args which may not be JSON-serializable.
		if ( ! $can_partial_refresh ) {
			$exported_args['fallback_cb'] = '';
			$exported_args['walker'] = '';
		}

		/*
		 * Replace object menu arg with a term_id menu arg, as this exports better
		 * to JS and is easier to compare hashes.
		 */
		if ( ! empty( $exported_args['menu'] ) && is_object( $exported_args['menu'] ) ) {
			$exported_args['menu'] = $exported_args['menu']->term_id;
		}

		ksort( $exported_args );
		$exported_args['args_hmac'] = $this->hash_nav_menu_args( $exported_args );

		$args['customize_preview_nav_menus_args'] = $exported_args;
		$this->preview_nav_menu_instance_args[ $exported_args['args_hmac'] ] = $exported_args;
		return $args;
	}

	/**
	 * Prepares wp_nav_menu() calls for partial refresh.
	 *
	 * Injects attributes into container element.
	 *
	 * @since 4.3.0
	 * @access public
	 *
	 * @see wp_nav_menu()
	 *
	 * @param string $nav_menu_content The HTML content for the navigation menu.
	 * @param object $args             An object containing wp_nav_menu() arguments.
	 * @return null
	 */
	public function filter_wp_nav_menu( $nav_menu_content, $args ) {
		if ( isset( $args->customize_preview_nav_menus_args['can_partial_refresh'] ) && $args->customize_preview_nav_menus_args['can_partial_refresh'] ) {
			$attributes = sprintf( ' data-customize-partial-id="%s"', esc_attr( 'nav_menu_instance[' . $args->customize_preview_nav_menus_args['args_hmac'] . ']' ) );
			$attributes .= ' data-customize-partial-type="nav_menu_instance"';
			$attributes .= sprintf( ' data-customize-partial-placement-context="%s"', esc_attr( wp_json_encode( $args->customize_preview_nav_menus_args ) ) );
			$nav_menu_content = preg_replace( '#^(<\w+)#', '$1 ' . $attributes, $nav_menu_content, 1 );
		}
		return $nav_menu_content;
	}

	/**
	 * Hashes (hmac) the nav menu arguments to ensure they are not tampered with when
	 * submitted in the Ajax request.
	 *
	 * Note that the array is expected to be pre-sorted.
	 *
	 * @since 4.3.0
	 * @access public
	 *
	 * @param array $args The arguments to hash.
	 * @return string Hashed nav menu arguments.
	 */
	public function hash_nav_menu_args( $args ) {
		return wp_hash( serialize( $args ) );
	}

	/**
	 * Enqueue scripts for the Customizer preview.
	 *
	 * @since 4.3.0
	 * @access public
	 */
	public function customize_preview_enqueue_deps() {
		wp_enqueue_script( 'customize-preview-nav-menus' ); // Note that we have overridden this.
	}

	/**
	 * Exports data from PHP to JS.
	 *
	 * @since 4.3.0
	 * @access public
	 */
	public function export_preview_data() {

		// Why not wp_localize_script? Because we're not localizing, and it forces values into strings.
		$exports = array(
			'navMenuInstanceArgs' => $this->preview_nav_menu_instance_args,
		);
		printf( '<script>var _wpCustomizePreviewNavMenusExports = %s;</script>', wp_json_encode( $exports ) );
	}

	/**
	 * Export any wp_nav_menu() calls during the rendering of any partials.
	 *
	 * @since 4.5.0
	 * @access public
	 *
	 * @param array $response Response.
	 * @return array Response.
	 */
	public function export_partial_rendered_nav_menu_instances( $response ) {
		$response['nav_menu_instance_args'] = $this->preview_nav_menu_instance_args;
		return $response;
	}

	/**
	 * Render a specific menu via wp_nav_menu() using the supplied arguments.
	 *
	 * @since 4.3.0
	 * @access public
	 *
	 * @see wp_nav_menu()
	 *
	 * @param WP_Customize_Partial $partial       Partial.
	 * @param array                $nav_menu_args Nav menu args supplied as container context.
	 * @return string|false
	 */
	public function render_nav_menu_partial( $partial, $nav_menu_args ) {
		unset( $partial );

		if ( ! isset( $nav_menu_args['args_hmac'] ) ) {
			// Error: missing_args_hmac.
			return false;
		}

		$nav_menu_args_hmac = $nav_menu_args['args_hmac'];
		unset( $nav_menu_args['args_hmac'] );

		ksort( $nav_menu_args );
		if ( ! hash_equals( $this->hash_nav_menu_args( $nav_menu_args ), $nav_menu_args_hmac ) ) {
			// Error: args_hmac_mismatch.
			return false;
		}

		ob_start();
		wp_nav_menu( $nav_menu_args );
		$content = ob_get_clean();

		return $content;
	}
}