<?php
/**
* Widget API: WP_Widget_Factory class
*
* @package WordPress
* @subpackage Widgets
* @since 4.4.0
*/
/**
* Singleton that registers and instantiates WP_Widget classes.
*
* @since 2.8.0
* @since 4.4.0 Moved to its own file from wp-includes/widgets.php
*/
class WP_Widget_Factory {
/**
* Widgets array.
*
* @since 2.8.0
* @var array
*/
public $widgets = array();
/**
* PHP5 constructor.
*
* @since 4.3.0
*/
public function __construct() {
add_action( 'widgets_init', array( $this, '_register_widgets' ), 100 );
}
/**
* PHP4 constructor.
*
* @since 2.8.0
* @deprecated 4.3.0 Use __construct() instead.
*
* @see WP_Widget_Factory::__construct()
*/
public function WP_Widget_Factory() {
_deprecated_constructor( 'WP_Widget_Factory', '4.3.0' );
self::__construct();
}
/**
* Registers a widget subclass.
*
* @since 2.8.0
* @since 4.6.0 Updated the `$widget` parameter to also accept a WP_Widget instance object
* instead of simply a `WP_Widget` subclass name.
*
* @param string|WP_Widget $widget Either the name of a `WP_Widget` subclass or an instance of a `WP_Widget` subclass.
*/
public function register( $widget ) {
if ( $widget instanceof WP_Widget ) {
$this->widgets[ spl_object_hash( $widget ) ] = $widget;
} else {
$this->widgets[ $widget ] = new $widget();
}
}
/**
* Un-registers a widget subclass.
*
* @since 2.8.0
* @since 4.6.0 Updated the `$widget` parameter to also accept a WP_Widget instance object
* instead of simply a `WP_Widget` subclass name.
*
* @param string|WP_Widget $widget Either the name of a `WP_Widget` subclass or an instance of a `WP_Widget` subclass.
*/
public function unregister( $widget ) {
if ( $widget instanceof WP_Widget ) {
unset( $this->widgets[ spl_object_hash( $widget ) ] );
} else {
unset( $this->widgets[ $widget ] );
}
}
/**
* Serves as a utility method for adding widgets to the registered widgets global.
*
* @since 2.8.0
*
* @global array $wp_registered_widgets
*/
public function _register_widgets() {
global $wp_registered_widgets;
$keys = array_keys( $this->widgets );
$registered = array_keys( $wp_registered_widgets );
$registered = array_map( '_get_widget_id_base', $registered );
foreach ( $keys as $key ) {
// Don't register new widget if old widget with the same id is already registered.
if ( in_array( $this->widgets[ $key ]->id_base, $registered, true ) ) {
unset( $this->widgets[ $key ] );
continue;
}
$this->widgets[ $key ]->_register();
}
}
/**
* Returns the registered WP_Widget object for the given widget type.
*
* @since 5.8.0
*
* @param string $id_base Widget type ID.
* @return WP_Widget|null
*/
public function get_widget_object( $id_base ) {
$key = $this->get_widget_key( $id_base );
if ( '' === $key ) {
return null;
}
return $this->widgets[ $key ];
}
/**
* Returns the registered key for the given widget type.
*
* @since 5.8.0
*
* @param string $id_base Widget type ID.
* @return string
*/
public function get_widget_key( $id_base ) {
foreach ( $this->widgets as $key => $widget_object ) {
if ( $widget_object->id_base === $id_base ) {
return $key;
}
}
return '';
}
}