class-wp-customize-partial.php 8.65 KB
Newer Older
Pham Huy committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311
<?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 );
		} 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 = 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;
	}
}