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<?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
*/
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 array
*/
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. Arguments to override class property defaults.
*
* @type array|string $settings All settings IDs tied to the partial. If undefined, `$id` will be used.
* }
*/
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 );
} else if ( 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 = null !== $return_render ? $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;
}
}
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