gutenberg / lib / experimental / interactivity-api / class-gutenberg-interactivity-api-full-page-navigation.php

class-gutenberg-interactivity-api-full-page-navigation.php in Gutenberg 23.7.2, at lib/experimental/interactivity-api/class-gutenberg-interactivity-api-full-page-navigation.php

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1	<?php
2	/**
3	* Interactivity API: Experimental full-page client-side navigation.
4	*
5	* @package Gutenberg
6	* @subpackage Interactivity API
7	*/
8
9	if ( ! class_exists( 'Gutenberg_Interactivity_API_Full_Page_Navigation' ) ) {
10
11	/**
12	* Class Gutenberg_Interactivity_API_Full_Page_Navigation.
13	*/
14	class Gutenberg_Interactivity_API_Full_Page_Navigation {
15
16	private static $instance = null;
17
18	public static function instance() {
19	if ( null === self::$instance ) {
20	self::$instance = new Gutenberg_Interactivity_API_Full_Page_Navigation();
21	}
22	return self::$instance;
23	}
24
25	public function __construct() {
26	add_action( 'wp_head', array( $this, 'buffer_start' ) );
27	add_action( 'wp_footer', array( $this, 'buffer_end' ), 8 );
28	add_action( 'wp_enqueue_scripts', array( $this, 'enqueue_script_modules' ) );
29	}
30
31	/**
32	* Enqueues the required script modules.
33	*/
34	public function enqueue_script_modules() {
35	wp_enqueue_script_module(
36	'@wordpress/interactivity-router/full-page'
37	);
38	}
39
40	/**
41	* Starts output buffering at the end of the 'wp_head' action, adding the
42	* required directives for client-side navigation to the BODY tags when the
43	* buffer is flushed.
44	*/
45	public function buffer_start() {
46	ob_start( array( $this, 'add_directives_to_body' ) );
47	}
48
49	/**
50	* Flushes the output buffer at the end of the 'wp_footer' action.
51	*/
52	public function buffer_end() {
53	ob_end_flush();
54	}
55
56	/**
57	* Adds client-side navigation directives to BODY tag in the passed output
58	* buffer.
59	*
60	* Note: This should probably be done per site, not by default when this option
61	* is enabled.
62	*
63	* @param string $buffer Passed output buffer.
64	*
65	* @return string The same HTML with modified BODY attributes.
66	*/
67	public function add_directives_to_body( $buffer ) {
68	$p = new WP_HTML_Tag_Processor( $buffer );
69	if ( $p->next_tag( array( 'tag_name' => 'BODY' ) ) ) {
70	$p->set_attribute( 'data-wp-interactive', true );
71	$p->set_attribute( 'data-wp-router-region', 'core/body' );
72	return $p->get_updated_html();
73	} else {
74	return $buffer;
75	}
76	}
77	}
78	}
79