+/**
+ * API for creating dynamic sidebar without hardcoding functionality into
+ * themes. Includes both internal WordPress routines and theme use routines.
+ *
+ * This functionality was found in a plugin before WordPress 2.2 release which
+ * included it in the core from that point on.
+ *
+ * @link https://codex.wordpress.org/Plugins/WordPress_Widgets WordPress Widgets
+ * @link https://codex.wordpress.org/Plugins/WordPress_Widgets_Api Widgets API
+ *
+ * @package WordPress
+ * @subpackage Widgets
+ */
+
+/**
+ * This class must be extended for each widget and WP_Widget::widget(), WP_Widget::update()
+ * and WP_Widget::form() need to be over-ridden.
+ *
+ * @package WordPress
+ * @subpackage Widgets
+ * @since 2.8.0
+ */
+class WP_Widget {
+
+ /**
+ * Root ID for all widgets of this type.
+ *
+ * @since 2.8.0
+ * @access public
+ * @var mixed|string
+ */
+ public $id_base;
+
+ /**
+ * Name for this widget type.
+ *
+ * @since 2.8.0
+ * @access public
+ * @var string
+ */
+ public $name;
+
+ /**
+ * Option array passed to {@see wp_register_sidebar_widget()}.
+ *
+ * @since 2.8.0
+ * @access public
+ * @var array
+ */
+ public $widget_options;
+
+ /**
+ * Option array passed to {@see wp_register_widget_control()}.
+ *
+ * @since 2.8.0
+ * @access public
+ * @var array
+ */
+ public $control_options;
+
+ /**
+ * Unique ID number of the current instance.
+ *
+ * @since 2.8.0
+ * @access public
+ * @var bool|int
+ */
+ public $number = false;
+
+ /**
+ * Unique ID string of the current instance (id_base-number).
+ *
+ * @since 2.8.0
+ * @access public
+ * @var bool|string
+ */
+ public $id = false;
+
+ /**
+ * Whether the widget data has been updated.
+ *
+ * Set to true when the data is updated after a POST submit - ensures it does
+ * not happen twice.
+ *
+ * @since 2.8.0
+ * @access public
+ * @var bool
+ */
+ public $updated = false;
+
+ // Member functions that you must over-ride.
+
+ /**
+ * Echo the widget content.
+ *
+ * Subclasses should over-ride this function to generate their widget code.
+ *
+ * @since 2.8.0
+ * @access public
+ *
+ * @param array $args Display arguments including before_title, after_title,
+ * before_widget, and after_widget.
+ * @param array $instance The settings for the particular instance of the widget.
+ */
+ public function widget( $args, $instance ) {
+ die('function WP_Widget::widget() must be over-ridden in a sub-class.');
+ }
+
+ /**
+ * Update a particular instance.
+ *
+ * This function should check that $new_instance is set correctly. The newly-calculated
+ * value of `$instance` should be returned. If false is returned, the instance won't be
+ * saved/updated.
+ *
+ * @since 2.8.0
+ * @access public
+ *
+ * @param array $new_instance New settings for this instance as input by the user via
+ * {@see WP_Widget::form()}.
+ * @param array $old_instance Old settings for this instance.
+ * @return array Settings to save or bool false to cancel saving.
+ */
+ public function update( $new_instance, $old_instance ) {
+ return $new_instance;
+ }
+
+ /**
+ * Output the settings update form.
+ *
+ * @since 2.8.0
+ * @access public
+ *
+ * @param array $instance Current settings.
+ * @return string Default return is 'noform'.
+ */
+ public function form($instance) {
+ echo '<p class="no-options-widget">' . __('There are no options for this widget.') . '</p>';
+ return 'noform';
+ }
+
+ // Functions you'll need to call.
+
+ /**
+ * PHP5 constructor.
+ *
+ * @since 2.8.0
+ * @access public
+ *
+ * @param string $id_base Optional Base ID for the widget, lowercase and unique. If left empty,
+ * a portion of the widget's class name will be used Has to be unique.
+ * @param string $name Name for the widget displayed on the configuration page.
+ * @param array $widget_options Optional. Widget options. See {@see wp_register_sidebar_widget()} for
+ * information on accepted arguments. Default empty array.
+ * @param array $control_options Optional. Widget control options. See {@see wp_register_widget_control()}
+ * for information on accepted arguments. Default empty array.
+ */
+ public function __construct( $id_base, $name, $widget_options = array(), $control_options = array() ) {
+ $this->id_base = empty($id_base) ? preg_replace( '/(wp_)?widget_/', '', strtolower(get_class($this)) ) : strtolower($id_base);
+ $this->name = $name;
+ $this->option_name = 'widget_' . $this->id_base;
+ $this->widget_options = wp_parse_args( $widget_options, array('classname' => $this->option_name) );
+ $this->control_options = wp_parse_args( $control_options, array('id_base' => $this->id_base) );
+ }
+
+ /**
+ * PHP4 constructor
+ *
+ * @param string $id_base
+ * @param string $name
+ * @param array $widget_options
+ * @param array $control_options
+ */
+ public function WP_Widget( $id_base, $name, $widget_options = array(), $control_options = array() ) {
+ _deprecated_constructor( 'WP_Widget', '4.3.0' );
+ WP_Widget::__construct( $id_base, $name, $widget_options, $control_options );
+ }
+
+ /**
+ * Constructs name attributes for use in form() fields
+ *
+ * This function should be used in form() methods to create name attributes for fields to be saved by update()
+ *
+ * @param string $field_name Field name
+ * @return string Name attribute for $field_name
+ */
+ public function get_field_name($field_name) {
+ return 'widget-' . $this->id_base . '[' . $this->number . '][' . $field_name . ']';
+ }
+
+ /**
+ * Constructs id attributes for use in {@see WP_Widget::form()} fields.
+ *
+ * This function should be used in form() methods to create id attributes
+ * for fields to be saved by {@see WP_Widget::update()}.
+ *
+ * @since 2.8.0
+ * @access public
+ *
+ * @param string $field_name Field name.
+ * @return string ID attribute for `$field_name`.
+ */
+ public function get_field_id( $field_name ) {
+ return 'widget-' . $this->id_base . '-' . $this->number . '-' . $field_name;
+ }
+
+ /**
+ * Register all widget instances of this widget class.
+ *
+ * @since 2.8.0
+ * @access private
+ */
+ public function _register() {
+ $settings = $this->get_settings();
+ $empty = true;
+
+ // When $settings is an array-like object, get an intrinsic array for use with array_keys().
+ if ( $settings instanceof ArrayObject || $settings instanceof ArrayIterator ) {
+ $settings = $settings->getArrayCopy();
+ }
+
+ if ( is_array( $settings ) ) {
+ foreach ( array_keys( $settings ) as $number ) {
+ if ( is_numeric( $number ) ) {
+ $this->_set( $number );
+ $this->_register_one( $number );
+ $empty = false;
+ }
+ }
+ }
+
+ if ( $empty ) {
+ // If there are none, we register the widget's existence with a generic template.
+ $this->_set( 1 );
+ $this->_register_one();
+ }
+ }
+
+ /**
+ * Set the internal order number for the widget instance.
+ *
+ * @since 2.8.0
+ * @access private
+ *
+ * @param int $number The unique order number of this widget instance compared to other
+ * instances of the same class.
+ */
+ public function _set($number) {
+ $this->number = $number;
+ $this->id = $this->id_base . '-' . $number;
+ }
+
+ /**
+ * @return callback
+ */
+ public function _get_display_callback() {
+ return array($this, 'display_callback');
+ }
+ /**
+ * @return callback
+ */
+ public function _get_update_callback() {
+ return array($this, 'update_callback');
+ }
+ /**
+ * @return callback
+ */
+ public function _get_form_callback() {
+ return array($this, 'form_callback');
+ }
+
+ /**
+ * Determine whether the current request is inside the Customizer preview.
+ *
+ * If true -- the current request is inside the Customizer preview, then
+ * the object cache gets suspended and widgets should check this to decide
+ * whether they should store anything persistently to the object cache,
+ * to transients, or anywhere else.
+ *
+ * @since 3.9.0
+ * @access public
+ *
+ * @global WP_Customize_Manager $wp_customize
+ *
+ * @return bool True if within the Customizer preview, false if not.
+ */
+ public function is_preview() {
+ global $wp_customize;
+ return ( isset( $wp_customize ) && $wp_customize->is_preview() ) ;
+ }
+
+ /**
+ * Generate the actual widget content (Do NOT override).
+ *
+ * Finds the instance and calls {@see WP_Widget::widget()}.
+ *
+ * @since 2.8.0
+ * @access public
+ *
+ * @param array $args Display arguments. See {@see WP_Widget::widget()} for information
+ * on accepted arguments.
+ * @param int|array $widget_args {
+ * Optional. Internal order number of the widget instance, or array of multi-widget arguments.
+ * Default 1.
+ *
+ * @type int $number Number increment used for multiples of the same widget.
+ * }
+ */
+ public function display_callback( $args, $widget_args = 1 ) {
+ if ( is_numeric( $widget_args ) ) {
+ $widget_args = array( 'number' => $widget_args );
+ }
+
+ $widget_args = wp_parse_args( $widget_args, array( 'number' => -1 ) );
+ $this->_set( $widget_args['number'] );
+ $instances = $this->get_settings();
+
+ if ( array_key_exists( $this->number, $instances ) ) {
+ $instance = $instances[ $this->number ];
+
+ /**
+ * Filter the settings for a particular widget instance.
+ *
+ * Returning false will effectively short-circuit display of the widget.
+ *
+ * @since 2.8.0
+ *
+ * @param array $instance The current widget instance's settings.
+ * @param WP_Widget $this The current widget instance.
+ * @param array $args An array of default widget arguments.
+ */
+ $instance = apply_filters( 'widget_display_callback', $instance, $this, $args );
+
+ if ( false === $instance ) {
+ return;
+ }
+
+ $was_cache_addition_suspended = wp_suspend_cache_addition();
+ if ( $this->is_preview() && ! $was_cache_addition_suspended ) {
+ wp_suspend_cache_addition( true );
+ }
+
+ $this->widget( $args, $instance );
+
+ if ( $this->is_preview() ) {
+ wp_suspend_cache_addition( $was_cache_addition_suspended );
+ }
+ }
+ }
+
+ /**
+ * Deal with changed settings (Do NOT override).
+ *
+ * @since 2.8.0
+ * @access public
+ *
+ * @global array $wp_registered_widgets
+ *
+ * @param int $deprecated Not used.
+ */
+ public function update_callback( $deprecated = 1 ) {
+ global $wp_registered_widgets;
+
+ $all_instances = $this->get_settings();
+
+ // We need to update the data
+ if ( $this->updated )
+ return;
+
+ if ( isset($_POST['delete_widget']) && $_POST['delete_widget'] ) {
+ // Delete the settings for this instance of the widget
+ if ( isset($_POST['the-widget-id']) )
+ $del_id = $_POST['the-widget-id'];
+ else
+ return;
+
+ if ( isset($wp_registered_widgets[$del_id]['params'][0]['number']) ) {
+ $number = $wp_registered_widgets[$del_id]['params'][0]['number'];
+
+ if ( $this->id_base . '-' . $number == $del_id )
+ unset($all_instances[$number]);
+ }
+ } else {
+ if ( isset($_POST['widget-' . $this->id_base]) && is_array($_POST['widget-' . $this->id_base]) ) {
+ $settings = $_POST['widget-' . $this->id_base];
+ } elseif ( isset($_POST['id_base']) && $_POST['id_base'] == $this->id_base ) {
+ $num = $_POST['multi_number'] ? (int) $_POST['multi_number'] : (int) $_POST['widget_number'];
+ $settings = array( $num => array() );
+ } else {
+ return;
+ }
+
+ foreach ( $settings as $number => $new_instance ) {
+ $new_instance = stripslashes_deep($new_instance);
+ $this->_set($number);
+
+ $old_instance = isset($all_instances[$number]) ? $all_instances[$number] : array();
+
+ $was_cache_addition_suspended = wp_suspend_cache_addition();
+ if ( $this->is_preview() && ! $was_cache_addition_suspended ) {
+ wp_suspend_cache_addition( true );
+ }
+
+ $instance = $this->update( $new_instance, $old_instance );
+
+ if ( $this->is_preview() ) {
+ wp_suspend_cache_addition( $was_cache_addition_suspended );
+ }
+
+ /**
+ * Filter a widget's settings before saving.
+ *
+ * Returning false will effectively short-circuit the widget's ability
+ * to update settings.
+ *
+ * @since 2.8.0
+ *
+ * @param array $instance The current widget instance's settings.
+ * @param array $new_instance Array of new widget settings.
+ * @param array $old_instance Array of old widget settings.
+ * @param WP_Widget $this The current widget instance.
+ */
+ $instance = apply_filters( 'widget_update_callback', $instance, $new_instance, $old_instance, $this );
+ if ( false !== $instance ) {
+ $all_instances[$number] = $instance;
+ }
+
+ break; // run only once
+ }
+ }
+
+ $this->save_settings($all_instances);
+ $this->updated = true;
+ }
+
+ /**
+ * Generate the widget control form (Do NOT override).
+ *
+ * @since 2.8.0
+ * @access public
+ *
+ * @param int|array $widget_args Widget instance number or array of widget arguments.
+ * @return string|null
+ */
+ public function form_callback( $widget_args = 1 ) {
+ if ( is_numeric($widget_args) )
+ $widget_args = array( 'number' => $widget_args );
+
+ $widget_args = wp_parse_args( $widget_args, array( 'number' => -1 ) );
+ $all_instances = $this->get_settings();
+
+ if ( -1 == $widget_args['number'] ) {
+ // We echo out a form where 'number' can be set later
+ $this->_set('__i__');
+ $instance = array();
+ } else {
+ $this->_set($widget_args['number']);
+ $instance = $all_instances[ $widget_args['number'] ];
+ }
+
+ /**
+ * Filter the widget instance's settings before displaying the control form.
+ *
+ * Returning false effectively short-circuits display of the control form.
+ *
+ * @since 2.8.0
+ *
+ * @param array $instance The current widget instance's settings.
+ * @param WP_Widget $this The current widget instance.
+ */
+ $instance = apply_filters( 'widget_form_callback', $instance, $this );
+
+ $return = null;
+ if ( false !== $instance ) {
+ $return = $this->form($instance);
+
+ /**
+ * Fires at the end of the widget control form.
+ *
+ * Use this hook to add extra fields to the widget form. The hook
+ * is only fired if the value passed to the 'widget_form_callback'
+ * hook is not false.
+ *
+ * Note: If the widget has no form, the text echoed from the default
+ * form method can be hidden using CSS.
+ *
+ * @since 2.8.0
+ *
+ * @param WP_Widget $this The widget instance, passed by reference.
+ * @param null $return Return null if new fields are added.
+ * @param array $instance An array of the widget's settings.
+ */
+ do_action_ref_array( 'in_widget_form', array( &$this, &$return, $instance ) );
+ }
+ return $return;
+ }
+
+ /**
+ * Register an instance of the widget class.
+ *
+ * @since 2.8.0
+ * @access private
+ *
+ * @param integer $number Optional. The unique order number of this widget instance
+ * compared to other instances of the same class. Default -1.
+ */
+ public function _register_one( $number = -1 ) {
+ wp_register_sidebar_widget( $this->id, $this->name, $this->_get_display_callback(), $this->widget_options, array( 'number' => $number ) );
+ _register_widget_update_callback( $this->id_base, $this->_get_update_callback(), $this->control_options, array( 'number' => -1 ) );
+ _register_widget_form_callback( $this->id, $this->name, $this->_get_form_callback(), $this->control_options, array( 'number' => $number ) );
+ }
+
+ /**
+ * Save the settings for all instances of the widget class.
+ *
+ * @since 2.8.0
+ * @access public
+ *
+ * @param array $settings Multi-dimensional array of widget instance settings.
+ */
+ public function save_settings( $settings ) {
+ $settings['_multiwidget'] = 1;
+ update_option( $this->option_name, $settings );
+ }
+
+ /**
+ * Get the settings for all instances of the widget class.
+ *
+ * @since 2.8.0
+ * @access public
+ *
+ * @return array Multi-dimensional array of widget instance settings.
+ */
+ public function get_settings() {
+
+ $settings = get_option( $this->option_name );
+
+ if ( false === $settings && isset( $this->alt_option_name ) ) {
+ $settings = get_option( $this->alt_option_name );
+ }
+
+ if ( ! is_array( $settings ) && ! ( $settings instanceof ArrayObject || $settings instanceof ArrayIterator ) ) {
+ $settings = array();
+ }
+
+ if ( ! empty( $settings ) && ! isset( $settings['_multiwidget'] ) ) {
+ // Old format, convert if single widget.
+ $settings = wp_convert_widget_settings( $this->id_base, $this->option_name, $settings );
+ }
+
+ unset( $settings['_multiwidget'], $settings['__i__'] );
+ return $settings;
+ }
+}
+
+/**
+ * Singleton that registers and instantiates WP_Widget classes.
+ *
+ * @package WordPress
+ * @subpackage Widgets
+ * @since 2.8.0
+ */
+class WP_Widget_Factory {
+ public $widgets = array();
+
+ /**
+ * PHP5 constructor.
+ */
+ public function __construct() {
+ add_action( 'widgets_init', array( $this, '_register_widgets' ), 100 );
+ }
+
+ /**
+ * PHP4 constructor.
+ */
+ public function WP_Widget_Factory() {
+ _deprecated_constructor( 'WP_Widget_Factory', '4.2.0' );
+ self::__construct();
+ }
+
+ /**
+ * Register a widget subclass.
+ *
+ * @since 2.8.0
+ * @access public
+ *
+ * @param string $widget_class The name of a {@see WP_Widget} subclass.
+ */
+ public function register( $widget_class ) {
+ $this->widgets[$widget_class] = new $widget_class();
+ }
+
+ /**
+ * Un-register a widget subclass.
+ *
+ * @since 2.8.0
+ * @access public
+ *
+ * @param string $widget_class The name of a {@see WP_Widget} subclass.
+ */
+ public function unregister( $widget_class ) {
+ unset( $this->widgets[ $widget_class ] );
+ }
+
+ /**
+ * Utility method for adding widgets to the registered widgets global.
+ *
+ * @since 2.8.0
+ * @access public
+ *
+ * @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();
+ }
+ }
+}
scripts.mit.edu / autoinstalls / wordpress.git / blobdiff