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Edit File: class-wp-customize-partial.php
<?php /** * Customize API: WP_Customize_Partial class * * @package WordPress * @subpackage Customize * @since 4.5.0 */ /** * Core Customizer class for implementing selective refresh partials. * * Representation of a rendered region in the previewed page that gets * selectively refreshed when an associated setting is changed. * This class is analogous of WP_Customize_Control. * * @since 4.5.0 */ #[AllowDynamicProperties] class WP_Customize_Partial { /** * Component. * * @since 4.5.0 * @var WP_Customize_Selective_Refresh */ public $component; /** * Unique identifier for the partial. * * If the partial is used to display a single setting, this would generally * be the same as the associated setting's ID. * * @since 4.5.0 * @var string */ public $id; /** * Parsed ID. * * @since 4.5.0 * @var array { * @type string $base ID base. * @type array $keys Keys for multidimensional. * } */ protected $id_data = array(); /** * Type of this partial. * * @since 4.5.0 * @var string */ public $type = 'default'; /** * The jQuery selector to find the container element for the partial. * * @since 4.5.0 * @var string */ public $selector; /** * IDs for settings tied to the partial. * * @since 4.5.0 * @var string[] */ public $settings; /** * The ID for the setting that this partial is primarily responsible for rendering. * * If not supplied, it will default to the ID of the first setting. * * @since 4.5.0 * @var string */ public $primary_setting; /** * Capability required to edit this partial. * * Normally this is empty and the capability is derived from the capabilities * of the associated `$settings`. * * @since 4.5.0 * @var string */ public $capability; /** * Render callback. * * @since 4.5.0 * * @see WP_Customize_Partial::render() * @var callable Callback is called with one argument, the instance of * WP_Customize_Partial. The callback can either echo the * partial or return the partial as a string, or return false if error. */ public $render_callback; /** * Whether the container element is included in the partial, or if only the contents are rendered. * * @since 4.5.0 * @var bool */ public $container_inclusive = false; /** * Whether to refresh the entire preview in case a partial cannot be refreshed. * * A partial render is considered a failure if the render_callback returns false. * * @since 4.5.0 * @var bool */ public $fallback_refresh = true; /** * Constructor. * * Supplied `$args` override class property defaults. * * If `$args['settings']` is not defined, use the $id as the setting ID. * * @since 4.5.0 * * @param WP_Customize_Selective_Refresh $component Customize Partial Refresh plugin instance. * @param string $id Control ID. * @param array $args { * Optional. Array of properties for the new Partials object. Default empty array. * * @type string $type Type of the partial to be created. * @type string $selector The jQuery selector to find the container element for the partial, that is, * a partial's placement. * @type string[] $settings IDs for settings tied to the partial. If undefined, `$id` will be used. * @type string $primary_setting The ID for the setting that this partial is primarily responsible for * rendering. If not supplied, it will default to the ID of the first setting. * @type string $capability Capability required to edit this partial. * Normally this is empty and the capability is derived from the capabilities * of the associated `$settings`. * @type callable $render_callback Render callback. * Callback is called with one argument, the instance of WP_Customize_Partial. * The callback can either echo the partial or return the partial as a string, * or return false if error. * @type bool $container_inclusive Whether the container element is included in the partial, or if only * the contents are rendered. * @type bool $fallback_refresh Whether to refresh the entire preview in case a partial cannot be refreshed. * A partial render is considered a failure if the render_callback returns * false. * } */ public function __construct( WP_Customize_Selective_Refresh $component, $id, $args = array() ) { $keys = array_keys( get_object_vars( $this ) ); foreach ( $keys as $key ) { if ( isset( $args[ $key ] ) ) { $this->$key = $args[ $key ]; } } $this->component = $component; $this->id = $id; $this->id_data['keys'] = preg_split( '/\[/', str_replace( ']', '', $this->id ) ); $this->id_data['base'] = array_shift( $this->id_data['keys'] ); if ( empty( $this->render_callback ) ) { $this->render_callback = array( $this, 'render_callback' ); } // Process settings. if ( ! isset( $this->settings ) ) { $this->settings = array( $id ); } elseif ( is_string( $this->settings ) ) { $this->settings = array( $this->settings ); } if ( empty( $this->primary_setting ) ) { $this->primary_setting = current( $this->settings ); } } /** * Retrieves parsed ID data for multidimensional setting. * * @since 4.5.0 * * @return array { * ID data for multidimensional partial. * * @type string $base ID base. * @type array $keys Keys for multidimensional array. * } */ final public function id_data() { return $this->id_data; } /** * Renders the template partial involving the associated settings. * * @since 4.5.0 * * @param array $container_context Optional. Array of context data associated with the target container (placement). * Default empty array. * @return string|array|false The rendered partial as a string, raw data array (for client-side JS template), * or false if no render applied. */ final public function render( $container_context = array() ) { $partial = $this; $rendered = false; if ( ! empty( $this->render_callback ) ) { ob_start(); $return_render = call_user_func( $this->render_callback, $this, $container_context ); $ob_render = ob_get_clean(); if ( null !== $return_render && '' !== $ob_render ) { _doing_it_wrong( __FUNCTION__, __( 'Partial render must echo the content or return the content string (or array), but not both.' ), '4.5.0' ); } /* * Note that the string return takes precedence because the $ob_render may just\ * include PHP warnings or notices. */ $rendered = $return_render ?? $ob_render; } /** * Filters partial rendering. * * @since 4.5.0 * * @param string|array|false $rendered The partial value. Default false. * @param WP_Customize_Partial $partial WP_Customize_Setting instance. * @param array $container_context Optional array of context data associated with * the target container. */ $rendered = apply_filters( 'customize_partial_render', $rendered, $partial, $container_context ); /** * Filters partial rendering for a specific partial. * * The dynamic portion of the hook name, `$partial->ID` refers to the partial ID. * * @since 4.5.0 * * @param string|array|false $rendered The partial value. Default false. * @param WP_Customize_Partial $partial WP_Customize_Setting instance. * @param array $container_context Optional array of context data associated with * the target container. */ $rendered = apply_filters( "customize_partial_render_{$partial->id}", $rendered, $partial, $container_context ); return $rendered; } /** * Default callback used when invoking WP_Customize_Control::render(). * * Note that this method may echo the partial *or* return the partial as * a string or array, but not both. Output buffering is performed when this * is called. Subclasses can override this with their specific logic, or they * may provide an 'render_callback' argument to the constructor. * * This method may return an HTML string for straight DOM injection, or it * may return an array for supporting Partial JS subclasses to render by * applying to client-side templating. * * @since 4.5.0 * * @param WP_Customize_Partial $partial Partial. * @param array $context Context. * @return string|array|false */ public function render_callback( WP_Customize_Partial $partial, $context = array() ) { unset( $partial, $context ); return false; } /** * Retrieves the data to export to the client via JSON. * * @since 4.5.0 * * @return array Array of parameters passed to the JavaScript. */ public function json() { $exports = array( 'settings' => $this->settings, 'primarySetting' => $this->primary_setting, 'selector' => $this->selector, 'type' => $this->type, 'fallbackRefresh' => $this->fallback_refresh, 'containerInclusive' => $this->container_inclusive, ); return $exports; } /** * Checks if the user can refresh this partial. * * Returns false if the user cannot manipulate one of the associated settings, * or if one of the associated settings does not exist. * * @since 4.5.0 * * @return bool False if user can't edit one of the related settings, * or if one of the associated settings does not exist. */ final public function check_capabilities() { if ( ! empty( $this->capability ) && ! current_user_can( $this->capability ) ) { return false; } foreach ( $this->settings as $setting_id ) { $setting = $this->component->manager->get_setting( $setting_id ); if ( ! $setting || ! $setting->check_capabilities() ) { return false; } } return true; } }