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0860bb2771
Prior to about 2013, many class methods lacked even access modifiers which made the `@access` notations that much more useful. Now that we've gotten to a point where the codebase is more mature from a maintenance perspective and we can finally remove these notations. Notable exceptions to this change include standalone functions notated as private as well as some classes still considered to represent "private" APIs. See #41452. Built from https://develop.svn.wordpress.org/trunk@41162 git-svn-id: http://core.svn.wordpress.org/trunk@41002 1a063a9b-81f0-0310-95a4-ce76da25c4cd
589 lines
17 KiB
PHP
589 lines
17 KiB
PHP
<?php
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/**
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* Widget API: WP_Widget base class
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*
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* @package WordPress
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* @subpackage Widgets
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* @since 4.4.0
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*/
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/**
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* Core base class extended to register widgets.
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*
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* This class must be extended for each widget, and WP_Widget::widget() must be overridden.
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*
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* If adding widget options, WP_Widget::update() and WP_Widget::form() should also be overridden.
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*
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* @since 2.8.0
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* @since 4.4.0 Moved to its own file from wp-includes/widgets.php
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*/
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class WP_Widget {
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/**
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* Root ID for all widgets of this type.
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*
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* @since 2.8.0
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* @var mixed|string
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*/
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public $id_base;
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/**
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* Name for this widget type.
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*
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* @since 2.8.0
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* @var string
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*/
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public $name;
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/**
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* Option name for this widget type.
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*
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* @since 2.8.0
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* @var string
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*/
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public $option_name;
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/**
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* Alt option name for this widget type.
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*
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* @since 2.8.0
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* @var string
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*/
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public $alt_option_name;
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/**
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* Option array passed to wp_register_sidebar_widget().
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*
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* @since 2.8.0
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* @var array
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*/
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public $widget_options;
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/**
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* Option array passed to wp_register_widget_control().
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*
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* @since 2.8.0
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* @var array
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*/
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public $control_options;
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/**
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* Unique ID number of the current instance.
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*
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* @since 2.8.0
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* @var bool|int
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*/
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public $number = false;
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/**
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* Unique ID string of the current instance (id_base-number).
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*
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* @since 2.8.0
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* @var bool|string
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*/
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public $id = false;
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/**
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* Whether the widget data has been updated.
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*
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* Set to true when the data is updated after a POST submit - ensures it does
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* not happen twice.
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*
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* @since 2.8.0
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* @var bool
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*/
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public $updated = false;
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//
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// Member functions that must be overridden by subclasses.
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//
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/**
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* Echoes the widget content.
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*
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* Sub-classes should over-ride this function to generate their widget code.
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*
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* @since 2.8.0
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*
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* @param array $args Display arguments including 'before_title', 'after_title',
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* 'before_widget', and 'after_widget'.
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* @param array $instance The settings for the particular instance of the widget.
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*/
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public function widget( $args, $instance ) {
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die('function WP_Widget::widget() must be over-ridden in a sub-class.');
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}
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/**
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* Updates a particular instance of a widget.
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*
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* This function should check that `$new_instance` is set correctly. The newly-calculated
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* value of `$instance` should be returned. If false is returned, the instance won't be
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* saved/updated.
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*
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* @since 2.8.0
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*
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* @param array $new_instance New settings for this instance as input by the user via
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* WP_Widget::form().
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* @param array $old_instance Old settings for this instance.
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* @return array Settings to save or bool false to cancel saving.
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*/
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public function update( $new_instance, $old_instance ) {
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return $new_instance;
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}
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/**
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* Outputs the settings update form.
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*
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* @since 2.8.0
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*
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* @param array $instance Current settings.
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* @return string Default return is 'noform'.
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*/
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public function form( $instance ) {
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echo '<p class="no-options-widget">' . __('There are no options for this widget.') . '</p>';
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return 'noform';
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}
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// Functions you'll need to call.
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/**
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* PHP5 constructor.
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*
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* @since 2.8.0
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*
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* @param string $id_base Optional Base ID for the widget, lowercase and unique. If left empty,
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* a portion of the widget's class name will be used Has to be unique.
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* @param string $name Name for the widget displayed on the configuration page.
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* @param array $widget_options Optional. Widget options. See wp_register_sidebar_widget() for information
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* on accepted arguments. Default empty array.
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* @param array $control_options Optional. Widget control options. See wp_register_widget_control() for
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* information on accepted arguments. Default empty array.
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*/
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public function __construct( $id_base, $name, $widget_options = array(), $control_options = array() ) {
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$this->id_base = empty($id_base) ? preg_replace( '/(wp_)?widget_/', '', strtolower(get_class($this)) ) : strtolower($id_base);
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$this->name = $name;
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$this->option_name = 'widget_' . $this->id_base;
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$this->widget_options = wp_parse_args( $widget_options, array( 'classname' => $this->option_name, 'customize_selective_refresh' => false ) );
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$this->control_options = wp_parse_args( $control_options, array( 'id_base' => $this->id_base ) );
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}
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/**
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* PHP4 constructor.
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*
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* @since 2.8.0
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*
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* @see __construct()
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*
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* @param string $id_base Optional Base ID for the widget, lowercase and unique. If left empty,
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* a portion of the widget's class name will be used Has to be unique.
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* @param string $name Name for the widget displayed on the configuration page.
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* @param array $widget_options Optional. Widget options. See wp_register_sidebar_widget() for information
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* on accepted arguments. Default empty array.
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* @param array $control_options Optional. Widget control options. See wp_register_widget_control() for
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* information on accepted arguments. Default empty array.
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*/
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public function WP_Widget( $id_base, $name, $widget_options = array(), $control_options = array() ) {
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_deprecated_constructor( 'WP_Widget', '4.3.0', get_class( $this ) );
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WP_Widget::__construct( $id_base, $name, $widget_options, $control_options );
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}
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/**
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* Constructs name attributes for use in form() fields
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*
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* This function should be used in form() methods to create name attributes for fields
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* to be saved by update()
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*
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* @since 2.8.0
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* @since 4.4.0 Array format field names are now accepted.
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*
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* @param string $field_name Field name
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* @return string Name attribute for $field_name
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*/
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public function get_field_name($field_name) {
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if ( false === $pos = strpos( $field_name, '[' ) ) {
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return 'widget-' . $this->id_base . '[' . $this->number . '][' . $field_name . ']';
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} else {
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return 'widget-' . $this->id_base . '[' . $this->number . '][' . substr_replace( $field_name, '][', $pos, strlen( '[' ) );
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}
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}
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/**
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* Constructs id attributes for use in WP_Widget::form() fields.
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*
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* This function should be used in form() methods to create id attributes
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* for fields to be saved by WP_Widget::update().
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*
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* @since 2.8.0
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* @since 4.4.0 Array format field IDs are now accepted.
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*
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* @param string $field_name Field name.
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* @return string ID attribute for `$field_name`.
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*/
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public function get_field_id( $field_name ) {
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return 'widget-' . $this->id_base . '-' . $this->number . '-' . trim( str_replace( array( '[]', '[', ']' ), array( '', '-', '' ), $field_name ), '-' );
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}
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/**
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* Register all widget instances of this widget class.
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*
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* @since 2.8.0
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*/
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public function _register() {
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$settings = $this->get_settings();
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$empty = true;
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// When $settings is an array-like object, get an intrinsic array for use with array_keys().
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if ( $settings instanceof ArrayObject || $settings instanceof ArrayIterator ) {
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$settings = $settings->getArrayCopy();
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}
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if ( is_array( $settings ) ) {
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foreach ( array_keys( $settings ) as $number ) {
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if ( is_numeric( $number ) ) {
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$this->_set( $number );
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$this->_register_one( $number );
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$empty = false;
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}
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}
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}
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if ( $empty ) {
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// If there are none, we register the widget's existence with a generic template.
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$this->_set( 1 );
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$this->_register_one();
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}
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}
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/**
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* Sets the internal order number for the widget instance.
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*
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* @since 2.8.0
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*
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* @param int $number The unique order number of this widget instance compared to other
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* instances of the same class.
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*/
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public function _set($number) {
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$this->number = $number;
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$this->id = $this->id_base . '-' . $number;
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}
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/**
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* Retrieves the widget display callback.
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*
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* @since 2.8.0
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*
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* @return callable Display callback.
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*/
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public function _get_display_callback() {
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return array($this, 'display_callback');
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}
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/**
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* Retrieves the widget update callback.
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*
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* @since 2.8.0
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*
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* @return callable Update callback.
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*/
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public function _get_update_callback() {
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return array($this, 'update_callback');
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}
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/**
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* Retrieves the form callback.
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*
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* @since 2.8.0
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*
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* @return callable Form callback.
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*/
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public function _get_form_callback() {
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return array($this, 'form_callback');
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}
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/**
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* Determines whether the current request is inside the Customizer preview.
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*
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* If true -- the current request is inside the Customizer preview, then
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* the object cache gets suspended and widgets should check this to decide
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* whether they should store anything persistently to the object cache,
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* to transients, or anywhere else.
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*
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* @since 3.9.0
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*
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* @global WP_Customize_Manager $wp_customize
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*
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* @return bool True if within the Customizer preview, false if not.
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*/
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public function is_preview() {
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global $wp_customize;
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return ( isset( $wp_customize ) && $wp_customize->is_preview() ) ;
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}
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/**
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* Generates the actual widget content (Do NOT override).
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*
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* Finds the instance and calls WP_Widget::widget().
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*
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* @since 2.8.0
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*
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* @param array $args Display arguments. See WP_Widget::widget() for information
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* on accepted arguments.
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* @param int|array $widget_args {
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* Optional. Internal order number of the widget instance, or array of multi-widget arguments.
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* Default 1.
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*
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* @type int $number Number increment used for multiples of the same widget.
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* }
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*/
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public function display_callback( $args, $widget_args = 1 ) {
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if ( is_numeric( $widget_args ) ) {
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$widget_args = array( 'number' => $widget_args );
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}
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$widget_args = wp_parse_args( $widget_args, array( 'number' => -1 ) );
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$this->_set( $widget_args['number'] );
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$instances = $this->get_settings();
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if ( array_key_exists( $this->number, $instances ) ) {
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$instance = $instances[ $this->number ];
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/**
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* Filters the settings for a particular widget instance.
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*
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* Returning false will effectively short-circuit display of the widget.
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*
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* @since 2.8.0
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*
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* @param array $instance The current widget instance's settings.
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* @param WP_Widget $this The current widget instance.
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* @param array $args An array of default widget arguments.
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*/
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$instance = apply_filters( 'widget_display_callback', $instance, $this, $args );
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if ( false === $instance ) {
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return;
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}
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$was_cache_addition_suspended = wp_suspend_cache_addition();
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if ( $this->is_preview() && ! $was_cache_addition_suspended ) {
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wp_suspend_cache_addition( true );
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}
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$this->widget( $args, $instance );
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if ( $this->is_preview() ) {
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wp_suspend_cache_addition( $was_cache_addition_suspended );
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}
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}
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}
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/**
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* Handles changed settings (Do NOT override).
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*
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* @since 2.8.0
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*
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* @global array $wp_registered_widgets
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*
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* @param int $deprecated Not used.
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*/
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public function update_callback( $deprecated = 1 ) {
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global $wp_registered_widgets;
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$all_instances = $this->get_settings();
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// We need to update the data
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if ( $this->updated )
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return;
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if ( isset($_POST['delete_widget']) && $_POST['delete_widget'] ) {
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// Delete the settings for this instance of the widget
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if ( isset($_POST['the-widget-id']) )
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$del_id = $_POST['the-widget-id'];
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else
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return;
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if ( isset($wp_registered_widgets[$del_id]['params'][0]['number']) ) {
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$number = $wp_registered_widgets[$del_id]['params'][0]['number'];
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if ( $this->id_base . '-' . $number == $del_id )
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unset($all_instances[$number]);
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}
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} else {
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if ( isset($_POST['widget-' . $this->id_base]) && is_array($_POST['widget-' . $this->id_base]) ) {
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$settings = $_POST['widget-' . $this->id_base];
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} elseif ( isset($_POST['id_base']) && $_POST['id_base'] == $this->id_base ) {
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$num = $_POST['multi_number'] ? (int) $_POST['multi_number'] : (int) $_POST['widget_number'];
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$settings = array( $num => array() );
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} else {
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return;
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}
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foreach ( $settings as $number => $new_instance ) {
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$new_instance = stripslashes_deep($new_instance);
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$this->_set($number);
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$old_instance = isset($all_instances[$number]) ? $all_instances[$number] : array();
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$was_cache_addition_suspended = wp_suspend_cache_addition();
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if ( $this->is_preview() && ! $was_cache_addition_suspended ) {
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wp_suspend_cache_addition( true );
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}
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$instance = $this->update( $new_instance, $old_instance );
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if ( $this->is_preview() ) {
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wp_suspend_cache_addition( $was_cache_addition_suspended );
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}
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/**
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* Filters a widget's settings before saving.
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*
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* Returning false will effectively short-circuit the widget's ability
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* to update settings.
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*
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* @since 2.8.0
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*
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* @param array $instance The current widget instance's settings.
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* @param array $new_instance Array of new widget settings.
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* @param array $old_instance Array of old widget settings.
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* @param WP_Widget $this The current widget instance.
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*/
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$instance = apply_filters( 'widget_update_callback', $instance, $new_instance, $old_instance, $this );
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if ( false !== $instance ) {
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$all_instances[$number] = $instance;
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}
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break; // run only once
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}
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}
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$this->save_settings($all_instances);
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$this->updated = true;
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}
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/**
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* Generates the widget control form (Do NOT override).
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*
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* @since 2.8.0
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*
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* @param int|array $widget_args {
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* Optional. Internal order number of the widget instance, or array of multi-widget arguments.
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* Default 1.
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*
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* @type int $number Number increment used for multiples of the same widget.
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* }
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* @return string|null
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*/
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public function form_callback( $widget_args = 1 ) {
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if ( is_numeric($widget_args) )
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$widget_args = array( 'number' => $widget_args );
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$widget_args = wp_parse_args( $widget_args, array( 'number' => -1 ) );
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$all_instances = $this->get_settings();
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if ( -1 == $widget_args['number'] ) {
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// We echo out a form where 'number' can be set later
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$this->_set('__i__');
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$instance = array();
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} else {
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$this->_set($widget_args['number']);
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$instance = $all_instances[ $widget_args['number'] ];
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}
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/**
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* Filters the widget instance's settings before displaying the control form.
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*
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* Returning false effectively short-circuits display of the control form.
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*
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* @since 2.8.0
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*
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* @param array $instance The current widget instance's settings.
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* @param WP_Widget $this The current widget instance.
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*/
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$instance = apply_filters( 'widget_form_callback', $instance, $this );
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$return = null;
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if ( false !== $instance ) {
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$return = $this->form($instance);
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/**
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* Fires at the end of the widget control form.
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*
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* Use this hook to add extra fields to the widget form. The hook
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* is only fired if the value passed to the 'widget_form_callback'
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* hook is not false.
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*
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* Note: If the widget has no form, the text echoed from the default
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* form method can be hidden using CSS.
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*
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* @since 2.8.0
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*
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* @param WP_Widget $this The widget instance, passed by reference.
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* @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;
|
|
}
|
|
|
|
/**
|
|
* Registers an instance of the widget class.
|
|
*
|
|
* @since 2.8.0
|
|
*
|
|
* @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 ) );
|
|
}
|
|
|
|
/**
|
|
* Saves the settings for all instances of the widget class.
|
|
*
|
|
* @since 2.8.0
|
|
*
|
|
* @param array $settings Multi-dimensional array of widget instance settings.
|
|
*/
|
|
public function save_settings( $settings ) {
|
|
$settings['_multiwidget'] = 1;
|
|
update_option( $this->option_name, $settings );
|
|
}
|
|
|
|
/**
|
|
* Retrieves the settings for all instances of the widget class.
|
|
*
|
|
* @since 2.8.0
|
|
*
|
|
* @return array Multi-dimensional array of widget instance settings.
|
|
*/
|
|
public function get_settings() {
|
|
|
|
$settings = get_option( $this->option_name );
|
|
|
|
if ( false === $settings ) {
|
|
if ( isset( $this->alt_option_name ) ) {
|
|
$settings = get_option( $this->alt_option_name );
|
|
} else {
|
|
// Save an option so it can be autoloaded next time.
|
|
$this->save_settings( array() );
|
|
}
|
|
}
|
|
|
|
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;
|
|
}
|
|
}
|