WP_Customize_Panel
概述
WP_Customize_Panel 是 WordPress 自定义工具中用于组织和管理设置面板的核心类。它提供了面板的创建、渲染、权限检查和活动状态管理等功能，支持通过子类扩展和 JavaScript 模板化渲染。
关键要点
- WP_Customize_Panel 用于在 WordPress 自定义工具中创建和管理面板，包含构造函数、属性（如 id、priority、capability）和方法（如 active、check_capabilities、json）。
- 面板支持活动回调（active_callback）以动态控制显示，并可通过 theme_supports 和 capability 检查权限和主题支持。
- 渲染过程包括 maybe_render、render 和 render_content 方法，默认使用 JavaScript 模板（content_template 和 render_template）进行客户端渲染。
- 类属性包括 instance_number 用于排序，sections 用于存储关联部分，以及 auto_expand_sole_section 等 UI 控制选项。
- 相关子类如 WP_Customize_Themes_Panel 和 WP_Customize_Nav_Menus_Panel 提供了特定功能的扩展实现。
代码示例
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;
$this->id = $id;
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.
}Methods
| Name | Description |
|---|---|
| WP_Customize_Panel::__construct | Constructor. |
| WP_Customize_Panel::active | Check whether panel is active to current Customizer preview. |
| WP_Customize_Panel::active_callback | Default callback used when invoking WP_Customize_Panel::active(). |
| WP_Customize_Panel::check_capabilities | Checks required user capabilities and whether the theme has the feature support required by the panel. |
| WP_Customize_Panel::content_template | An Underscore (JS) template for this panel’s content (but not its container). |
| WP_Customize_Panel::get_content | Get the panel’s content template for insertion into the Customizer pane. |
| WP_Customize_Panel::json | Gather the parameters passed to client JavaScript via JSON. |
| WP_Customize_Panel::maybe_render | Check capabilities and render the panel. |
| WP_Customize_Panel::print_template | Render the panel’s JS templates. |
| WP_Customize_Panel::render | Render the panel container, and then its contents (via `this->render_content()`) in a subclass. |
| WP_Customize_Panel::render_content | Render the panel UI in a subclass. |
| WP_Customize_Panel::render_template | An Underscore (JS) template for rendering this panel’s container. |
Source
class WP_Customize_Panel {
/**
* Incremented with each new class instantiation, then stored in $instance_number.
*
* Used when sorting two instances whose priorities are equal.
*
* @since 4.1.0
* @var int
*/
protected static $instance_count = 0;
/**
* Order in which this instance was created in relation to other instances.
*
* @since 4.1.0
* @var int
*/
public $instance_number;
/**
* WP_Customize_Manager instance.
*
* @since 4.0.0
* @var WP_Customize_Manager
*/
public $manager;
/**
* Unique identifier.
*
* @since 4.0.0
* @var string
*/
public $id;
/**
* Priority of the panel, defining the display order of panels and sections.
*
* @since 4.0.0
* @var int
*/
public $priority = 160;
/**
* Capability required for the panel.
*
* @since 4.0.0
* @var string
*/
public $capability = 'edit_theme_options';
/**
* Theme features required to support the panel.
*
* @since 4.0.0
* @var mixed[]
*/
public $theme_supports = '';
/**
* Title of the panel to show in UI.
*
* @since 4.0.0
* @var string
*/
public $title = '';
/**
* Description to show in the UI.
*
* @since 4.0.0
* @var string
*/
public $description = '';
/**
* Auto-expand a section in a panel when the panel is expanded when the panel only has the one section.
*
* @since 4.7.4
* @var bool
*/
public $auto_expand_sole_section = false;
/**
* Customizer sections for this panel.
*
* @since 4.0.0
* @var array
*/
public $sections;
/**
* Type of this panel.
*
* @since 4.1.0
* @var string
*/
public $type = 'default';
/**
* Active callback.
*
* @since 4.1.0
*
* @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
* being previewed).
*/
public $active_callback = '';
/**
* Constructor.
*
* Any supplied $args override class property defaults.
*
* @since 4.0.0
*
* @param WP_Customize_Manager $manager Customizer bootstrap instance.
* @param string $id A specific ID for the panel.
* @param array $args {
* 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;
$this->id = $id;
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.
*
* @since 4.1.0
*
* @return bool Whether the panel is active to the current preview.
*/
final public function active() {
$panel = $this;
$active = call_user_func( $this->active_callback, $this );
/**
* Filters response of WP_Customize_Panel::active().
*
* @since 4.1.0
*
* @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 );
return $active;
}
/**
* 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.
*
* @since 4.1.0
*
* @return bool Always true.
*/
public function active_callback() {
return true;
}
/**
* Gather the parameters passed to client JavaScript via JSON.
*
* @since 4.1.0
*
* @return array The array to be exported to the client as JSON.
*/
public function 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;
return $array;
}
/**
* Checks required user capabilities and whether the theme has the
* feature support required by the panel.
*
* @since 4.0.0
* @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 ) ) {
return false;
}
if ( $this->theme_supports && ! current_theme_supports( ...(array) $this->theme_supports ) ) {
return false;
}
return true;
}
/**
* Get the panel's content template for insertion into the Customizer pane.
*
* @since 4.1.0
*
* @return string Content for the panel.
*/
final public function get_content() {
ob_start();
$this->maybe_render();
return trim( ob_get_clean() );
}
/**
* Check capabilities and render the panel.
*
* @since 4.0.0
*/
final public function maybe_render() {
if ( ! $this->check_capabilities() ) {
return;
}
/**
* Fires before rendering a Customizer panel.
*
* @since 4.0.0
*
* @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.
*
* @since 4.0.0
*/
do_action( "customize_render_panel_{$this->id}" );
$this->render();
}
/**
* 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().
*
* @since 4.0.0
*/
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().
*
* @since 4.1.0
*/
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().
*
* @since 4.3.0
*
* @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"></script>
<script type="text/html" id="tmpl-customize-panel-<?php echo esc_attr( $this->type ); ?>"></script>
<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">
{{ data.title }}
</button>
</h3>
<ul class="accordion-sub-container control-panel-content" id="{{ data.id }}-content"></ul>
</li>
<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">
</span></button>
<div class="accordion-section-title">
<span class="preview-notice">
{{ data.title }}</strong>' );
?>
</span>
<# if ( data.description ) { #>
<button type="button" class="customize-help-toggle dashicons dashicons-editor-help" aria-expanded="false"><span class="screen-reader-text">
</span></button>
<# } #>
</div>
<# if ( data.description ) { #>
<div class="description customize-panel-description">
{{{ data.description }}}
</div>
<# } #>
<div class="customize-control-notifications-container"></div>
</li>
</pre><p class="wporg-dot-link-list"><a href="https://developer.wordpress.org/reference/files/wp-includes/class-wp-customize-panel.php/">View all references</a> <a href="https://core.trac.wordpress.org/browser/tags/6.9.4/src/wp-includes/class-wp-customize-panel.php#L25">View on Trac</a> <a href="https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/class-wp-customize-panel.php#L25-L409">View on GitHub</a></p></section>
<section class="wp-block-wporg-code-reference-related" data-nosnippet="true"><h2 id="related" class="is-toc-heading wp-block-heading has-heading-5-font-size" tabindex="-1" ><a href="#related">Related</a></h2> <section style="margin-top:var(--wp--preset--spacing--20)" class="wp-block-wporg-code-table" id="used-by"><figure class="wp-block-table "><table><thead><tr><th scope="col">Used by</th><th scope="col">Description</th></tr></thead><tbody><tr class=""><td><a href="https://developer.wordpress.org/reference/classes/wp_customize_themes_panel/">WP_Customize_Themes_Panel</a><code>wp-includes/customize/class-wp-customize-themes-panel.php
Customize Themes Panel Class
WP_Customize_Nav_Menus_Panelwp-includes/customize/class-wp-customize-nav-menus-panel.php
Customize Nav Menus Panel Class