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<?php
/**
* Functions used in making widgets interopable with block editors.
*
* @package gutenberg
*/
/**
* Checks if a screen containing the block editor is being loaded.
*
* @return boolean True if a screen containing the block editor is being loaded.
*/
function gutenberg_is_block_editor() {
// If get_current_screen does not exist, we are neither in the standard block editor for posts, or the widget block editor.
// We can safely return false.
if ( ! function_exists( 'get_current_screen' ) ) {
return false;
}
$screen = get_current_screen();
return ! empty( $screen ) &&
(
$screen->is_block_editor() ||
'appearance_page_gutenberg-widgets' === $screen->id ||
( function_exists( 'gutenberg_is_edit_site_page' ) && gutenberg_is_edit_site_page( $screen->id ) )
);
}
/**
* Whether or not to use the block editor to manage widgets. Defaults to true
* unless a theme has removed support for widgets-block-editor or a plugin has
* filtered the return value of this function.
*
* @return boolean Whether or not to use the block editor to manage widgets.
*/
function gutenberg_use_widgets_block_editor() {
/**
* Filters whether or not to use the block editor to manage widgets.
*
* @param boolean $use_widgets_block_editor Whether or not to use the block editor to manage widgets.
*/
return apply_filters(
'gutenberg_use_widgets_block_editor',
get_theme_support( 'widgets-block-editor' )
);
}
/**
* Emulates the Widgets screen `admin_print_styles` when at the block editor
* screen.
*/
function gutenberg_block_editor_admin_print_styles() {
if ( gutenberg_is_block_editor() ) {
/** This action is documented in wp-admin/admin-footer.php */
// phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
do_action( 'admin_print_styles-widgets.php' );
}
}
add_action( 'admin_print_styles', 'gutenberg_block_editor_admin_print_styles' );
/**
* Emulates the Widgets screen `admin_print_scripts` when at the block editor
* screen.
*/
function gutenberg_block_editor_admin_print_scripts() {
if ( gutenberg_is_block_editor() ) {
/** This action is documented in wp-admin/includes/ajax-actions.php */
do_action( 'load-widgets.php' ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
/** This action is documented in wp-admin/includes/ajax-actions.php */
do_action( 'widgets.php' ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
/** This action is documented in wp-admin/widgets.php */
do_action( 'sidebar_admin_setup' );
// phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
do_action( 'admin_print_scripts-widgets.php' );
}
}
add_action( 'admin_print_scripts', 'gutenberg_block_editor_admin_print_scripts' );
/**
* Emulates the Widgets screen `admin_print_footer_scripts` when at the block
* editor screen.
*/
function gutenberg_block_editor_admin_print_footer_scripts() {
if ( gutenberg_is_block_editor() ) {
/** This action is documented in wp-admin/admin-footer.php */
// phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
do_action( 'admin_print_footer_scripts-widgets.php' );
}
}
add_action( 'admin_print_footer_scripts', 'gutenberg_block_editor_admin_print_footer_scripts' );
/**
* Emulates the Widgets screen `admin_footer` when at the block editor screen.
*/
function gutenberg_block_editor_admin_footer() {
if ( gutenberg_is_block_editor() ) {
/** This action is documented in wp-admin/admin-footer.php */
// phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
do_action( 'admin_footer-widgets.php' );
}
}
add_action( 'admin_footer', 'gutenberg_block_editor_admin_footer' );
/**
* Adds a save widgets nonce required by the legacy widgets block.
*/
function gutenberg_print_save_widgets_nonce() {
// The function wpWidgets.save needs this nonce to work as expected.
echo implode(
"\n",
array(
'<form method="post">',
wp_nonce_field( 'save-sidebar-widgets', '_wpnonce_widgets', false ),
'</form>',
)
);
}
add_action( 'admin_footer-widgets.php', 'gutenberg_print_save_widgets_nonce' );
/**
* Returns the settings required by legacy widgets blocks.
*
* @return array Legacy widget settings.
*/
function gutenberg_get_legacy_widget_settings() {
$settings = array();
/**
* Filters the list of widget classes that should **not** be offered by the legacy widget block.
*
* Returning an empty array will make all the widgets available.
*
* @param array $widgets An array of excluded widgets classnames.
*
* @since 5.6.0
*/
$widgets_to_exclude_from_legacy_widget_block = apply_filters(
'widgets_to_exclude_from_legacy_widget_block',
array(
'WP_Widget_Block',
'WP_Widget_Pages',
'WP_Widget_Calendar',
'WP_Widget_Archives',
'WP_Widget_Media_Audio',
'WP_Widget_Media_Image',
'WP_Widget_Media_Gallery',
'WP_Widget_Media_Video',
'WP_Widget_Meta',
'WP_Widget_Search',
'WP_Widget_Text',
'WP_Widget_Categories',
'WP_Widget_Recent_Posts',
'WP_Widget_Recent_Comments',
'WP_Widget_RSS',
'WP_Widget_Tag_Cloud',
'WP_Nav_Menu_Widget',
'WP_Widget_Custom_HTML',
)
);
$available_legacy_widgets = array();
global $wp_widget_factory;
if ( ! empty( $wp_widget_factory ) ) {
foreach ( $wp_widget_factory->widgets as $class => $widget_obj ) {
$available_legacy_widgets[ $class ] = array(
'name' => html_entity_decode( $widget_obj->name ),
'id_base' => $widget_obj->id_base,
// wp_widget_description is not being used because its input parameter is a Widget Id.
// Widgets id's reference to a specific widget instance.
// Here we are iterating on all the available widget classes even if no widget instance exists for them.
'description' => isset( $widget_obj->widget_options['description'] ) ?
html_entity_decode( $widget_obj->widget_options['description'] ) :
null,
'isReferenceWidget' => false,
'isHidden' => in_array( $class, $widgets_to_exclude_from_legacy_widget_block, true ),
);
}
}
global $wp_registered_widgets;
if ( ! empty( $wp_registered_widgets ) ) {
foreach ( $wp_registered_widgets as $widget_id => $widget_obj ) {
$block_widget_start = 'blocks-widget-';
if (
( is_array( $widget_obj['callback'] ) &&
isset( $widget_obj['callback'][0] ) &&
( $widget_obj['callback'][0] instanceof WP_Widget ) ) ||
// $widget_id starts with $block_widget_start.
strncmp( $widget_id, $block_widget_start, strlen( $block_widget_start ) ) === 0
) {
continue;
}
$available_legacy_widgets[ $widget_id ] = array(
'name' => html_entity_decode( $widget_obj['name'] ),
'description' => html_entity_decode( wp_widget_description( $widget_id ) ),
'isReferenceWidget' => true,
);
}
}
$settings['availableLegacyWidgets'] = $available_legacy_widgets;
return gutenberg_experiments_editor_settings( $settings );
}
/**
* Extends default editor settings with values supporting legacy widgets.
*
* @param array $settings Default editor settings.
*
* @return array Filtered editor settings.
*/
function gutenberg_legacy_widget_settings( $settings ) {
return array_merge( $settings, gutenberg_get_legacy_widget_settings() );
}
add_filter( 'block_editor_settings', 'gutenberg_legacy_widget_settings' );
/**
* Function to enqueue admin-widgets as part of the block editor assets.
*/
function gutenberg_enqueue_widget_scripts() {
wp_enqueue_script( 'admin-widgets' );
}
add_action( 'enqueue_block_editor_assets', 'gutenberg_enqueue_widget_scripts' );
/**
* Overrides dynamic_sidebar_params to make sure Blocks are not wrapped in <form> tag.
*
* @param array $arg Dynamic sidebar params.
* @return array Updated dynamic sidebar params.
*/
function gutenberg_override_sidebar_params_for_block_widget( $arg ) {
if ( 'Block' === $arg[0]['widget_name'] ) {
$arg[0]['before_form'] = '';
$arg[0]['before_widget_content'] = '<div class="widget-content">';
$arg[0]['after_widget_content'] = '</div><form class="block-widget-form">';
$arg[0]['after_form'] = '</form>';
}
return $arg;
}
/**
* Registers the WP_Widget_Block widget
*/
function gutenberg_register_widgets() {
if ( ! gutenberg_use_widgets_block_editor() ) {
return;
}
register_widget( 'WP_Widget_Block' );
// By default every widget on widgets.php is wrapped with a <form>.
// This means that you can sometimes end up with invalid HTML, e.g. when
// one of the widgets is a Search block.
//
// To fix the problem, let's add a filter that moves the form below the actual
// widget content.
global $pagenow;
if ( 'widgets.php' === $pagenow ) {
add_filter(
'dynamic_sidebar_params',
'gutenberg_override_sidebar_params_for_block_widget'
);
}
}
add_action( 'widgets_init', 'gutenberg_register_widgets' );
/**
* Hook into before the widgets editor screen is loaded and, if widget-preview
* is set, render the requested preview of a legacy widget instead. This powers
* the Preview option in the Legacy Widget block.
*/
function gutenberg_load_widget_preview_if_requested() {
if (
isset( $_GET['widget-preview'] ) &&
current_user_can( 'edit_theme_options' )
) {
define( 'IFRAME_REQUEST', true );
require_once dirname( __FILE__ ) . '/widget-preview-template.php';
exit;
}
}
add_filter( 'load-appearance_page_gutenberg-widgets', 'gutenberg_load_widget_preview_if_requested' );