* WordPress Customize Panel classes
if ( ! defined( 'ABSPATH' ) ) {
* A UI container for sections, managed by the WP_Customize_Manager.
* @see WP_Customize_Manager
#[AllowDynamicProperties]
class WP_Customize_Panel {
* Incremented with each new class instantiation, then stored in $instance_number.
* Used when sorting two instances whose priorities are equal.
protected static $instance_count = 0;
* Order in which this instance was created in relation to other instances.
* WP_Customize_Manager instance.
* @var WP_Customize_Manager
* Priority of the panel, defining the display order of panels and sections.
* Capability required for the panel.
public $capability = 'edit_theme_options';
* Theme features required to support the panel.
public $theme_supports = '';
* Title of the panel to show in UI.
* Description to show in the UI.
public $description = '';
* Auto-expand a section in a panel when the panel is expanded when the panel only has the one section.
public $auto_expand_sole_section = false;
* Customizer sections for this panel.
public $type = 'default';
* @see WP_Customize_Section::active()
* @var callable Callback is called with one argument, the instance of
* WP_Customize_Section, and returns bool to indicate whether
* the section is active (such as it relates to the URL currently
public $active_callback = '';
* Any supplied $args override class property defaults.
* @param WP_Customize_Manager $manager Customizer bootstrap instance.
* @param string $id A specific ID for the panel.
* Optional. Array of properties for the new Panel object. Default empty array.
* @type int $priority Priority of the panel, defining the display order
* of panels and sections. Default 160.
* @type string $capability Capability required for the panel.
* Default `edit_theme_options`.
* @type mixed[] $theme_supports Theme features required to support the panel.
* @type string $title Title of the panel to show in UI.
* @type string $description Description to show in the UI.
* @type string $type Type of the panel.
* @type callable $active_callback Active callback.
public function __construct( $manager, $id, $args = array() ) {
$keys = array_keys( get_object_vars( $this ) );
foreach ( $keys as $key ) {
if ( isset( $args[ $key ] ) ) {
$this->$key = $args[ $key ];
$this->manager = $manager;
if ( empty( $this->active_callback ) ) {
$this->active_callback = array( $this, 'active_callback' );
self::$instance_count += 1;
$this->instance_number = self::$instance_count;
$this->sections = array(); // Users cannot customize the $sections array.
* Check whether panel is active to current Customizer preview.
* @return bool Whether the panel is active to the current preview.
final public function active() {
$active = call_user_func( $this->active_callback, $this );
* Filters response of WP_Customize_Panel::active().
* @param bool $active Whether the Customizer panel is active.
* @param WP_Customize_Panel $panel WP_Customize_Panel instance.
$active = apply_filters( 'customize_panel_active', $active, $panel );
* Default callback used when invoking WP_Customize_Panel::active().
* Subclasses can override this with their specific logic, or they may
* provide an 'active_callback' argument to the constructor.
* @return bool Always true.
public function active_callback() {
* Gather the parameters passed to client JavaScript via JSON.
* @return array The array to be exported to the client as JSON.
$array = wp_array_slice_assoc( (array) $this, array( 'id', 'description', 'priority', 'type' ) );
$array['title'] = html_entity_decode( $this->title, ENT_QUOTES, get_bloginfo( 'charset' ) );
$array['content'] = $this->get_content();
$array['active'] = $this->active();
$array['instanceNumber'] = $this->instance_number;
$array['autoExpandSoleSection'] = $this->auto_expand_sole_section;
* Checks required user capabilities and whether the theme has the
* feature support required by the panel.
* @since 5.9.0 Method was marked non-final.
* @return bool False if theme doesn't support the panel or the user doesn't have the capability.
public function check_capabilities() {
if ( $this->capability && ! current_user_can( $this->capability ) ) {
if ( $this->theme_supports && ! current_theme_supports( ...(array) $this->theme_supports ) ) {
* Get the panel's content template for insertion into the Customizer pane.
* @return string Content for the panel.
final public function get_content() {
return trim( ob_get_clean() );
* Check capabilities and render the panel.
final public function maybe_render() {
if ( ! $this->check_capabilities() ) {
* Fires before rendering a Customizer panel.
* @param WP_Customize_Panel $panel WP_Customize_Panel instance.
do_action( 'customize_render_panel', $this );
* Fires before rendering a specific Customizer panel.
* The dynamic portion of the hook name, `$this->id`, refers to
* the ID of the specific Customizer panel to be rendered.
do_action( "customize_render_panel_{$this->id}" );
* Render the panel container, and then its contents (via `this->render_content()`) in a subclass.
* Panel containers are now rendered in JS by default, see WP_Customize_Panel::print_template().
protected function render() {}
* Render the panel UI in a subclass.
* Panel contents are now rendered in JS by default, see WP_Customize_Panel::print_template().
protected function render_content() {}
* Render the panel's JS templates.
* This function is only run for panel types that have been registered with
* WP_Customize_Manager::register_panel_type().
* @see WP_Customize_Manager::register_panel_type()
public function print_template() {
<script type="text/html" id="tmpl-customize-panel-<?php echo esc_attr( $this->type ); ?>-content">
<?php $this->content_template(); ?>
<script type="text/html" id="tmpl-customize-panel-<?php echo esc_attr( $this->type ); ?>">
<?php $this->render_template(); ?>
* An Underscore (JS) template for rendering this panel's container.
* Class variables for this panel class are available in the `data` JS object;
* export custom variables by overriding WP_Customize_Panel::json().
* @see WP_Customize_Panel::print_template()
protected function render_template() {
<li id="accordion-panel-{{ data.id }}" class="accordion-section control-section control-panel control-panel-{{ data.type }}">
<h3 class="accordion-section-title">
<button type="button" class="accordion-trigger" aria-expanded="false" aria-controls="{{ data.id }}-content">
<ul class="accordion-sub-container control-panel-content" id="{{ data.id }}-content"></ul>
* An Underscore (JS) template for this panel's content (but not its container).
* Class variables for this panel class are available in the `data` JS object;
* export custom variables by overriding WP_Customize_Panel::json().
* @see WP_Customize_Panel::print_template()
protected function content_template() {
<li class="panel-meta customize-info accordion-section <# if ( ! data.description ) { #> cannot-expand<# } #>">
<button class="customize-panel-back" tabindex="-1"><span class="screen-reader-text">
/* translators: Hidden accessibility text. */
<div class="accordion-section-title">
<span class="preview-notice">
/* translators: %s: The site/panel title in the Customizer. */
printf( __( 'You are customizing %s' ), '<strong class="panel-title">{{ data.title }}</strong>' );
<# if ( data.description ) { #>
<button type="button" class="customize-help-toggle dashicons dashicons-editor-help" aria-expanded="false"><span class="screen-reader-text">
/* translators: Hidden accessibility text. */
<# if ( data.description ) { #>
<div class="description customize-panel-description">
<div class="customize-control-notifications-container"></div>
/** WP_Customize_Nav_Menus_Panel class */
require_once ABSPATH . WPINC . '/customize/class-wp-customize-nav-menus-panel.php';