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Block Editor: Add helper functions to collect meta box information.
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To allow the block editor to render meta boxes, it needs to collect information about how those meta boxes are registered, and format it for the block editor to make use of.

See #45112.



git-svn-id: https://develop.svn.wordpress.org/branches/5.0@43778 602fd350-edb4-49c9-b593-d223f7449a82
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@pento
pento committed Oct 22, 2018
1 parent d0eaeb3 commit 0154e30
Showing 1 changed file with 141 additions and 0 deletions.
141 changes: 141 additions & 0 deletions src/wp-admin/includes/post.php
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Expand Up @@ -1890,6 +1890,12 @@ function use_block_editor_for_post( $post ) {
return false;
}

// We're in the meta box loader, so don't use the block editor.
if ( isset( $_GET['meta-box-loader'] ) ) {
check_admin_referer( 'meta-box-loader' );
return false;
}

$use_block_editor = use_block_editor_for_post_type( $post->post_type );

/**
Expand Down Expand Up @@ -2017,3 +2023,138 @@ function get_block_editor_server_block_settings() {

return $blocks;
}

/**
* Renders the meta boxes forms.
*
* @since 5.0.0
*/
function the_block_editor_meta_boxes() {
global $post, $current_screen, $wp_meta_boxes;

// Handle meta box state.
$_original_meta_boxes = $wp_meta_boxes;

/**
* Fires right before the meta boxes are rendered.
*
* This allows for the filtering of meta box data, that should already be
* present by this point. Do not use as a means of adding meta box data.
*
* @since 5.0.0
*
* @param array $wp_meta_boxes Global meta box state.
*/
$wp_meta_boxes = apply_filters( 'filter_block_editor_meta_boxes', $wp_meta_boxes );
$locations = array( 'side', 'normal', 'advanced' );
$priorities = array( 'high', 'sorted', 'core', 'default', 'low' );

// Render meta boxes.
?>
<form class="metabox-base-form">
<?php the_block_editor_meta_box_post_form_hidden_fields( $post ); ?>
</form>
<?php foreach ( $locations as $location ) : ?>
<form class="metabox-location-<?php echo esc_attr( $location ); ?>">
<div id="poststuff" class="sidebar-open">
<div id="postbox-container-2" class="postbox-container">
<?php
do_meta_boxes(
$current_screen,
$location,
$post
);
?>
</div>
</div>
</form>
<?php endforeach; ?>
<?php

$meta_boxes_per_location = array();
foreach ( $locations as $location ) {
$meta_boxes_per_location[ $location ] = array();

if ( ! isset( $wp_meta_boxes[ $current_screen->id ][ $location ] ) ) {
continue;
}

foreach ( $priorities as $priority ) {
if ( ! isset( $wp_meta_boxes[ $current_screen->id ][ $location ][ $priority ] ) ) {
continue;
}

$meta_boxes = (array) $wp_meta_boxes[ $current_screen->id ][ $location ][ $priority ];
foreach ( $meta_boxes as $meta_box ) {
if ( ! empty( $meta_box['title'] ) ) {
$meta_boxes_per_location[ $location ][] = array(
'id' => $meta_box['id'],
'title' => $meta_box['title'],
);
}
}
}
}

/**
* Sadly we probably can not add this data directly into editor settings.
*
* Some meta boxes need admin_head to fire for meta box registry.
* admin_head fires after admin_enqueue_scripts, which is where we create our
* editor instance.
*/
$script = 'window._wpLoadBlockEditor.then( function() {
wp.data.dispatch( \'core/edit-post\' ).setAvailableMetaBoxesPerLocation( ' . wp_json_encode( $meta_boxes_per_location ) . ' );
} );';

wp_add_inline_script( 'wp-edit-post', $script );

/**
* When `wp-edit-post` is output in the `<head>`, the inline script needs to be manually printed. Otherwise,
* meta boxes will not display because inline scripts for `wp-edit-post` will not be printed again after this point.
*/
if ( wp_script_is( 'wp-edit-post', 'done' ) ) {
printf( "<script type='text/javascript'>\n%s\n</script>\n", trim( $script ) );
}

// Reset meta box data.
$wp_meta_boxes = $_original_meta_boxes;
}

/**
* Renders the hidden form required for the meta boxes form.
*
* @since 5.0.0
*
* @param WP_Post $post Current post object.
*/
function the_block_editor_meta_box_post_form_hidden_fields( $post ) {
$form_extra = '';
if ( 'auto-draft' === $post->post_status ) {
$form_extra .= "<input type='hidden' id='auto_draft' name='auto_draft' value='1' />";
}
$form_action = 'editpost';
$nonce_action = 'update-post_' . $post->ID;
$form_extra .= "<input type='hidden' id='post_ID' name='post_ID' value='" . esc_attr( $post->ID ) . "' />";
$referer = wp_get_referer();
$current_user = wp_get_current_user();
$user_id = $current_user->ID;
wp_nonce_field( $nonce_action );
?>
<input type="hidden" id="user-id" name="user_ID" value="<?php echo (int) $user_id; ?>" />
<input type="hidden" id="hiddenaction" name="action" value="<?php echo esc_attr( $form_action ); ?>" />
<input type="hidden" id="originalaction" name="originalaction" value="<?php echo esc_attr( $form_action ); ?>" />
<input type="hidden" id="post_type" name="post_type" value="<?php echo esc_attr( $post->post_type ); ?>" />
<input type="hidden" id="original_post_status" name="original_post_status" value="<?php echo esc_attr( $post->post_status ); ?>" />
<input type="hidden" id="referredby" name="referredby" value="<?php echo $referer ? esc_url( $referer ) : ''; ?>" />

<?php
if ( 'draft' !== get_post_status( $post ) ) {
wp_original_referer_field( true, 'previous' );
}
echo $form_extra;
wp_nonce_field( 'meta-box-order', 'meta-box-order-nonce', false );
wp_nonce_field( 'closedpostboxes', 'closedpostboxesnonce', false );
// Permalink title nonce.
wp_nonce_field( 'samplepermalink', 'samplepermalinknonce', false );
}

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