navigation-theme-opt-in.php in Gutenberg 23.2.0, at lib/experimental/navigation-theme-opt-in.php

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1	<?php
2	/**
3	* Extend WordPress core's rendering of menus to support block-based menus.
4	*
5	* @package gutenberg
6	*/
7
8	/**
9	* Shim that hooks into `wp_update_nav_menu_item` and makes it so that nav menu
10	* items support a 'content' field. This field contains HTML and is used by nav
11	* menu items with `type` set to `'block'`.
12	*
13	* Specifically, this shim makes it so that:
14	*
15	* 1) The `wp_update_nav_menu_item()` function supports setting
16	* `'menu-item-content'` on a menu item. When merged to Core, this functionality
17	* should exist in `wp_update_nav_menu_item()`.
18	*
19	* 2) Updating a menu via nav-menus.php supports setting `'menu-item-content'`
20	* on a menu item. When merged to Core, this functionality should exist in
21	* `wp_nav_menu_update_menu_items()`.
22	*
23	* 3) The `customize_save` ajax action supports setting `'content'` on a nav
24	* menu item. When merged to Core, this functionality should exist in
25	* `WP_Customize_Manager::save()`.
26	*
27	* This shim can be removed when the Gutenberg plugin requires a WordPress
28	* version that has the ticket below.
29	*
30	* @see https://core.trac.wordpress.org/ticket/50544
31	*
32	* @global WP_Customize_Manager $wp_customize
33	*
34	* @param int $menu_id ID of the updated menu.
35	* @param int $menu_item_db_id ID of the new menu item.
36	* @param array $args An array of arguments used to update/add the menu item.
37	*/
38	function gutenberg_update_nav_menu_item_content( $menu_id, $menu_item_db_id, $args ) {
39	global $wp_customize;
40
41	// Support setting content in nav-menus.php by grabbing the value from
42	// $_POST. This belongs in `wp_nav_menu_update_menu_items()`.
43	if ( isset( $_POST['menu-item-content'][ $menu_item_db_id ] ) ) {
44	$args['menu-item-content'] = wp_unslash( $_POST['menu-item-content'][ $menu_item_db_id ] );
45	}
46
47	// Support setting content in customize_save admin-ajax.php requests by
48	// grabbing the unsanitized $_POST values. This belongs in
49	// `WP_Customize_Manager::save()`.
50	if ( isset( $wp_customize ) ) {
51	$values = $wp_customize->unsanitized_post_values();
52	if ( isset( $values[ "nav_menu_item[$menu_item_db_id]" ]['content'] ) ) {
53	if ( is_string( $values[ "nav_menu_item[$menu_item_db_id]" ]['content'] ) ) {
54	$args['menu-item-content'] = $values[ "nav_menu_item[$menu_item_db_id]" ]['content'];
55	} elseif ( isset( $values[ "nav_menu_item[$menu_item_db_id]" ]['content']['raw'] ) ) {
56	$args['menu-item-content'] = $values[ "nav_menu_item[$menu_item_db_id]" ]['content']['raw'];
57	}
58	}
59	}
60
61	// Everything else belongs in `wp_update_nav_menu_item()`.
62
63	$defaults = array(
64	'menu-item-content' => '',
65	);
66
67	$args = wp_parse_args( $args, $defaults );
68
69	update_post_meta( $menu_item_db_id, '_menu_item_content', wp_slash( $args['menu-item-content'] ) );
70	}
71	add_action( 'wp_update_nav_menu_item', 'gutenberg_update_nav_menu_item_content', 10, 3 );
72
73	/**
74	* Shim that hooks into `wp_setup_nav_menu_items` and makes it so that nav menu
75	* items have a 'content' field. This field contains HTML and is used by nav
76	* menu items with `type` set to `'block'`.
77	*
78	* Specifically, this shim makes it so that the `wp_setup_nav_menu_item()`
79	* function sets `content` on the returned menu item. When merged to Core, this
80	* functionality should exist in `wp_setup_nav_menu_item()`.
81	*
82	* This shim can be removed when the Gutenberg plugin requires a WordPress
83	* version that has the ticket below.
84	*
85	* @see https://core.trac.wordpress.org/ticket/50544
86	*
87	* @param object $menu_item The menu item object.
88	*
89	* @return object Updated menu item object.
90	*/
91	function gutenberg_setup_block_nav_menu_item( $menu_item ) {
92	if ( 'block' === $menu_item->type ) {
93	$menu_item->type_label = __( 'Block', 'gutenberg' );
94	$menu_item->content = $menu_item->content ?? get_post_meta( $menu_item->db_id, '_menu_item_content', true );
95
96	// Set to make the menu item display nicely in nav-menus.php.
97	$menu_item->object = 'block';
98	$menu_item->title = __( 'Block', 'gutenberg' );
99	}
100
101	return $menu_item;
102	}
103	add_filter( 'wp_setup_nav_menu_item', 'gutenberg_setup_block_nav_menu_item' );
104
105	/**
106	* Shim that hooks into `walker_nav_menu_start_el` and makes it so that the
107	* default walker which renders a menu will correctly render the HTML associated
108	* with any navigation menu item that has `type` set to `'block`'.
109	*
110	* Specifically, this shim makes it so that `Walker_Nav_Menu::start_el()`
111	* renders the `content` of a nav menu item when its `type` is `'block'`. When
112	* merged to Core, this functionality should exist in
113	* `Walker_Nav_Menu::start_el()`.
114	*
115	* This shim can be removed when the Gutenberg plugin requires a WordPress
116	* version that has the ticket below.
117	*
118	* @see https://core.trac.wordpress.org/ticket/50544
119	*
120	* @param string $item_output The menu item's starting HTML output.
121	* @param WP_Post $item Menu item data object.
122	* @param int $depth Depth of menu item. Used for padding.
123	* @param stdClass $args An object of wp_nav_menu() arguments.
124	*
125	* @return string The menu item's updated HTML output.
126	*/
127	function gutenberg_output_block_nav_menu_item( $item_output, $item, $depth, $args ) {
128	if ( 'block' === $item->type ) {
129	$item_output = $args->before;
130	/** This filter is documented in wp-includes/post-template.php */
131	$item_output .= apply_filters( 'the_content', $item->content );
132	$item_output .= $args->after;
133	}
134
135	return $item_output;
136	}
137	add_filter( 'walker_nav_menu_start_el', 'gutenberg_output_block_nav_menu_item', 10, 4 );
138
139	/**
140	* Shim that prevents menu items with type `'block'` from being rendered in the
141	* frontend when the theme does not support block menus.
142	*
143	* Specifically, this shim makes it so that `wp_nav_menu()` will remove any menu
144	* items that have a `type` of `'block'` from `$sorted_menu_items`. When merged
145	* to Core, this functionality should exist in `wp_nav_menu()`.
146	*
147	* This shim can be removed when the Gutenberg plugin requires a WordPress
148	* version that has the ticket below.
149	*
150	* @see https://core.trac.wordpress.org/ticket/50544
151	*
152	* @param array $menu_items The menu items, sorted by each menu item's menu order.
153	*
154	* @return array Updated menu items, sorted by each menu item's menu order.
155	*/
156	function gutenberg_remove_block_nav_menu_items( $menu_items ) {
157	// We should uncomment the line below when the block-nav-menus feature becomes stable.
158	// @see https://github.com/WordPress/gutenberg/issues/34265.
159	/if ( current_theme_supports( 'block-nav-menus' ) ) {/
160	if ( false ) {
161	return $menu_items;
162	}
163
164	return array_filter(
165	$menu_items,
166	static function ( $menu_item ) {
167	return 'block' !== $menu_item->type;
168	}
169	);
170	}
171	add_filter( 'wp_nav_menu_objects', 'gutenberg_remove_block_nav_menu_items', 10 );
172
173	/**
174	* Recursively converts a list of menu items into a list of blocks. This is a
175	* helper function used by `gutenberg_output_block_nav_menu()`.
176	*
177	* Transformation depends on the menu item type. Link menu items are turned into
178	* a `core/navigation-link` block. Block menu items are simply parsed.
179	*
180	* @param array $menu_items The menu items to convert, sorted by each menu item's menu order.
181	* @param array $menu_items_by_parent_id All menu items, indexed by their parent's ID.
182	*
183	* @return array Updated menu items, sorted by each menu item's menu order.
184	*/
185	function gutenberg_convert_menu_items_to_blocks(
186	$menu_items,
187	&$menu_items_by_parent_id
188	) {
189	if ( empty( $menu_items ) ) {
190	return array();
191	}
192
193	$blocks = array();
194
195	foreach ( $menu_items as $menu_item ) {
196	if ( 'block' === $menu_item->type ) {
197	$parsed_blocks = parse_blocks( $menu_item->content );
198
199	if ( count( $parsed_blocks ) ) {
200	$block = $parsed_blocks[0];
201	} else {
202	$block = array(
203	'blockName' => 'core/freeform',
204	'attrs' => array(
205	'originalContent' => $menu_item->content,
206	),
207	);
208	}
209	} else {
210	$block = array(
211	'blockName' => 'core/navigation-link',
212	'attrs' => array(
213	'label' => $menu_item->title,
214	'url' => $menu_item->url,
215	),
216	);
217	}
218
219	$block['innerBlocks'] = gutenberg_convert_menu_items_to_blocks(
220	$menu_items_by_parent_id[ $menu_item->ID ] ?? array(),
221	$menu_items_by_parent_id
222	);
223
224	$blocks[] = $block;
225	}
226
227	return $blocks;
228	}
229
230	/**
231	* Shim that causes `wp_nav_menu()` to output a Navigation block instead of a
232	* nav menu when the theme supports block menus. The Navigation block is
233	* constructed by transforming the stored tree of menu items into a tree of
234	* blocks.
235	*
236	* Specifically, this shim makes it so that `wp_nav_menu()` returns early when
237	* the theme supports block menus. When merged to Core, this functionality
238	* should exist in `wp_nav_menu()` after `$sorted_menu_items` is set. The
239	* duplicated code (marked using BEGIN and END) can be deleted.
240	*
241	* This shim can be removed when the Gutenberg plugin requires a WordPress
242	* version that has the ticket below.
243	*
244	* @see https://core.trac.wordpress.org/ticket/50544
245	*
246	* @param string\|null $output Nav menu output to short-circuit with. Default null.
247	* @param stdClass $args An object containing wp_nav_menu() arguments.
248	*
249	* @return string\|null Nav menu output to short-circuit with.
250	*/
251	function gutenberg_output_block_nav_menu( $output, $args ) {
252	// We should uncomment the line below when the block-nav-menus feature becomes stable.
253	// @see https://github.com/WordPress/gutenberg/issues/34265.
254	/if ( ! current_theme_supports( 'block-nav-menus' ) ) {/
255	if ( true ) {
256	return null;
257	}
258
259	// BEGIN: Code that already exists in wp_nav_menu().
260
261	// Get the nav menu based on the requested menu.
262	$menu = wp_get_nav_menu_object( $args->menu );
263
264	// Get the nav menu based on the theme_location.
265	$locations = get_nav_menu_locations();
266	if ( ! $menu && $args->theme_location && $locations && isset( $locations[ $args->theme_location ] ) ) {
267	$menu = wp_get_nav_menu_object( $locations[ $args->theme_location ] );
268	}
269
270	// Get the first menu that has items if we still can't find a menu.
271	if ( ! $menu && ! $args->theme_location ) {
272	$menus = wp_get_nav_menus();
273	foreach ( $menus as $menu_maybe ) {
274	$menu_items = wp_get_nav_menu_items( $menu_maybe->term_id, array( 'update_post_term_cache' => false ) );
275	if ( $menu_items ) {
276	$menu = $menu_maybe;
277	break;
278	}
279	}
280	}
281
282	if ( empty( $args->menu ) ) {
283	$args->menu = $menu;
284	}
285
286	// If the menu exists, get its items.
287	if ( $menu && ! is_wp_error( $menu ) && ! isset( $menu_items ) ) {
288	$menu_items = wp_get_nav_menu_items( $menu->term_id, array( 'update_post_term_cache' => false ) );
289	}
290
291	// Set up the $menu_item variables.
292	_wp_menu_item_classes_by_context( $menu_items );
293
294	$sorted_menu_items = array();
295	foreach ( (array) $menu_items as $menu_item ) {
296	$sorted_menu_items[ $menu_item->menu_order ] = $menu_item;
297	}
298
299	unset( $menu_items, $menu_item );
300
301	// END: Code that already exists in wp_nav_menu().
302
303	$menu_items_by_parent_id = array();
304	foreach ( $sorted_menu_items as $menu_item ) {
305	$menu_items_by_parent_id[ $menu_item->menu_item_parent ][] = $menu_item;
306	}
307
308	$block_attributes = $args->block_attributes ?? array();
309
310	$navigation_block = array(
311	'blockName' => 'core/navigation',
312	'attrs' => $block_attributes,
313	'innerBlocks' => gutenberg_convert_menu_items_to_blocks(
314	$menu_items_by_parent_id[0] ?? array(),
315	$menu_items_by_parent_id
316	),
317	);
318
319	return render_block( $navigation_block );
320	}
321	add_filter( 'pre_wp_nav_menu', 'gutenberg_output_block_nav_menu', 10, 2 );
322
323	/**
324	* Shim that makes nav-menus.php nicely display a menu item with its `type` set to
325	* `'block'`.
326	*
327	* Specifically, this shim makes it so that `Walker_Nav_Menu_Edit::start_el()`
328	* outputs extra form fields. When merged to Core, this markup should exist in
329	* `Walker_Nav_Menu_Edit::start_el()`.
330	*
331	* This shim can be removed when the Gutenberg plugin requires a WordPress
332	* version that has the ticket below.
333	*
334	* @see https://core.trac.wordpress.org/ticket/50544
335	*
336	* @param int $item_id Menu item ID.
337	* @param WP_Post $item Menu item data object.
338	*/
339	function gutenberg_output_block_menu_item_custom_fields( $item_id, $item ) {
340	if ( 'block' === $item->type ) {
341	?>
342	<p class="field-content description description-wide">
343	<label for="edit-menu-item-content-<?php echo $item_id; ?>">
344	<?php _e( 'Content', 'gutenberg' ); ?><br />
345	<textarea id="edit-menu-item-content-<?php echo $item_id; ?>" class="widefat" rows="3" cols="20" name="menu-item-content[<?php echo $item_id; ?>]" readonly><?php echo esc_textarea( trim( $item->content ) ); ?></textarea>
346	</label>
347	</p>
348	<?php
349	}
350	}
351	add_action( 'wp_nav_menu_item_custom_fields', 'gutenberg_output_block_menu_item_custom_fields', 10, 2 );
352
353	/**
354	* Shim that adds extra styling to nav-menus.php. This lets us style menu items
355	* that have a `type` set to `'block'`. When merged to Core, this CSS should be
356	* moved to nav-menus.css.
357	*
358	* This shim can be removed when the Gutenberg plugin requires a WordPress
359	* version that has the ticket below.
360	*
361	* @see https://core.trac.wordpress.org/ticket/50544
362	*
363	* @param string $hook The current admin page.
364	*/
365	function gutenberg_add_block_menu_item_styles_to_nav_menus( $hook ) {
366	if ( 'nav-menus.php' === $hook ) {
367	$css = <<<CSS
368	/**
369	* HACK: We're hiding the description field using CSS because this
370	* cannot be done using a filter. When merged to Core, we should
371	* actually remove the field from
372	* `Walker_Nav_Menu_Edit::start_el()`.
373	*/
374	.menu-item-block .description:not(.field-content) {
375	display: none;
376	}
377	CSS;
378	wp_add_inline_style( 'nav-menus', $css );
379	}
380	}
381	add_action( 'admin_enqueue_scripts', 'gutenberg_add_block_menu_item_styles_to_nav_menus' );
382