WordPress/wp-includes/class-wp-widget.php
Drew Jaynes a92dc6aeed Docs: Improve the file header for class-wp-widget.php to describe what the file contains.
Also rewrites the class DocBlock summary for `WP_Widget` to better describe the '''purpose''' of the class.

See #33413. See #33701.

Built from https://develop.svn.wordpress.org/trunk@33869


git-svn-id: http://core.svn.wordpress.org/trunk@33837 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2015-09-03 02:50:21 +00:00

551 lines
16 KiB
PHP

<?php
/**
* Widgets API: WP_Widget base class
*
* @package WordPress
* @subpackage Widgets
* @since 4.4.0
*/
/**
* Core base class extended to register widgets.
*
* This class must be extended for each widget and WP_Widget::widget(), WP_Widget::update()
* and WP_Widget::form() need to be overridden.
*
* @since 2.8.0
* @since 4.4.0 Moved to its own file from wp-includes/widgets.php
*/
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;
}
}