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1 <?php 2 /** 3 * Server-side rendering of the `core/image` block. 4 * 5 * @package WordPress 6 */ 7 8 /** 9 * Renders the `core/image` block on the server, 10 * adding a data-id attribute to the element if core/gallery has added on pre-render. 11 * 12 * @since 5.9.0 13 * 14 * @param array $attributes The block attributes. 15 * @param string $content The block content. 16 * @param WP_Block $block The block object. 17 * 18 * @return string The block content with the data-id attribute added. 19 */ 20 function render_block_core_image( $attributes, $content, $block ) { 21 if ( false === stripos( $content, '<img' ) ) { 22 return ''; 23 } 24 25 $processor = new class( $content ) extends WP_HTML_Tag_Processor { 26 /** 27 * Return input span for an empty FIGCAPTION element. 28 * 29 * Returns span of input for an empty FIGCAPTION, if currently matched on a 30 * FIGCAPTION opening tag and if the element is properly closed and empty. 31 * 32 * @since 6.9.0 33 * 34 * @return WP_HTML_Span|false Span of input if the element is empty; otherwise false. 35 */ 36 public function block_core_image_extract_empty_figcaption_element() { 37 $this->set_bookmark( 'here' ); 38 $opener = $this->bookmarks['here']; 39 40 // Allow comments within the definition of “empty.” 41 while ( $this->next_token() && '#comment' === $this->get_token_name() ) { 42 continue; 43 } 44 45 if ( 'FIGCAPTION' !== $this->get_tag() || ! $this->is_tag_closer() ) { 46 return false; 47 } 48 49 $this->set_bookmark( 'here' ); 50 $closer = $this->bookmarks['here']; 51 52 return new WP_HTML_Span( $opener->start, $closer->start + $closer->length - $opener->start ); 53 } 54 }; 55 56 if ( ! $processor->next_tag( 'img' ) || ! $processor->get_attribute( 'src' ) ) { 57 return ''; 58 } 59 60 $has_id_binding = isset( $attributes['metadata']['bindings']['id'] ) && isset( $attributes['id'] ); 61 62 // Ensure the `wp-image-id` classname on the image block supports block bindings. 63 if ( $has_id_binding ) { 64 // If there's a mismatch with the 'wp-image-' class and the actual id, the id was 65 // probably overridden by block bindings. Update it to the correct value. 66 // See https://github.com/WordPress/gutenberg/issues/62886 for why this is needed. 67 $id = $attributes['id']; 68 $image_classnames = $processor->get_attribute( 'class' ); 69 $class_with_binding_value = "wp-image-$id"; 70 if ( is_string( $image_classnames ) && ! str_contains( $image_classnames, $class_with_binding_value ) ) { 71 $image_classnames = preg_replace( '/wp-image-(\d+)/', $class_with_binding_value, $image_classnames ); 72 $processor->set_attribute( 'class', $image_classnames ); 73 } 74 } 75 76 // For backwards compatibility, the data-id html attribute is only set for 77 // image blocks nested in a gallery. Detect if the image is in a gallery by 78 // checking the data-id attribute. 79 // See the `block_core_gallery_data_id_backcompatibility` function. 80 if ( isset( $attributes['data-id'] ) ) { 81 // If there's a binding for the `id`, the `id` attribute is used for the 82 // value, since `data-id` does not support block bindings. 83 // Else the `data-id` is used for backwards compatibility, since 84 // third parties may be filtering its value. 85 $data_id = $has_id_binding ? $attributes['id'] : $attributes['data-id']; 86 $processor->set_attribute( 'data-id', $data_id ); 87 } 88 89 /* 90 * If the `caption` attribute is empty and we encounter a `<figcaption>` element, 91 * we take note of its span so we can remove it later. 92 */ 93 if ( $processor->next_tag( 'FIGCAPTION' ) && empty( $attributes['caption'] ) ) { 94 $figcaption_span = $processor->block_core_image_extract_empty_figcaption_element(); 95 } 96 97 $link_destination = isset( $attributes['linkDestination'] ) ? $attributes['linkDestination'] : 'none'; 98 $lightbox_settings = block_core_image_get_lightbox_settings( $block->parsed_block ); 99 100 /* 101 * If the lightbox is enabled and the image is not linked, adds the filter and 102 * the JavaScript view file. 103 */ 104 if ( 105 isset( $lightbox_settings ) && 106 'none' === $link_destination && 107 isset( $lightbox_settings['enabled'] ) && 108 true === $lightbox_settings['enabled'] 109 ) { 110 wp_enqueue_script_module( '@wordpress/block-library/image/view' ); 111 112 /* 113 * This render needs to happen in a filter with priority 15 to ensure that 114 * it runs after the duotone filter and that duotone styles are applied to 115 * the image in the lightbox. Lightbox has to work with any plugins that 116 * might use filters as well. Removing this can be considered in the future 117 * if the way the blocks are rendered changes, or if a new kind of filter is 118 * introduced. 119 */ 120 add_filter( 'render_block_core/image', 'block_core_image_render_lightbox', 15, 2 ); 121 } else { 122 /* 123 * Remove the filter if previously added by other Image blocks. 124 */ 125 remove_filter( 'render_block_core/image', 'block_core_image_render_lightbox', 15 ); 126 } 127 128 $output = $processor->get_updated_html(); 129 if ( ! empty( $figcaption_span ) ) { 130 return substr( $output, 0, $figcaption_span->start ) . substr( $output, $figcaption_span->start + $figcaption_span->length ); 131 } 132 return $output; 133 } 134 135 /** 136 * Adds the lightboxEnabled flag to the block data. 137 * 138 * This is used to determine whether the lightbox should be rendered or not. 139 * 140 * @since 6.4.0 141 * 142 * @param array $block Block data. 143 * 144 * @return array|null Filtered block data. 145 */ 146 function block_core_image_get_lightbox_settings( $block ) { 147 // Gets the lightbox setting from the block attributes. 148 if ( isset( $block['attrs']['lightbox'] ) ) { 149 $lightbox_settings = $block['attrs']['lightbox']; 150 } 151 152 if ( ! isset( $lightbox_settings ) ) { 153 $lightbox_settings = wp_get_global_settings( array( 'lightbox' ), array( 'block_name' => 'core/image' ) ); 154 155 // If not present in global settings, check the top-level global settings. 156 // 157 // NOTE: If no block-level settings are found, the previous call to 158 // `wp_get_global_settings` will return the whole `theme.json` structure in 159 // which case we can check if the "lightbox" key is present at the top-level 160 // of the global settings and use its value. 161 if ( isset( $lightbox_settings['lightbox'] ) ) { 162 $lightbox_settings = wp_get_global_settings( array( 'lightbox' ) ); 163 } 164 } 165 166 return $lightbox_settings ?? null; 167 } 168 169 /** 170 * Adds the directives and layout needed for the lightbox behavior. 171 * 172 * @since 6.4.0 173 * 174 * @param string $block_content Rendered block content. 175 * @param array $block Block object. 176 * 177 * @return string Filtered block content. 178 */ 179 function block_core_image_render_lightbox( $block_content, $block ) { 180 /* 181 * If there's no IMG tag in the block then return the given block content 182 * as-is. There's nothing that this code can knowingly modify to add the 183 * lightbox behavior. 184 */ 185 $processor = new WP_HTML_Tag_Processor( $block_content ); 186 if ( $processor->next_tag( 'figure' ) ) { 187 $processor->set_bookmark( 'figure' ); 188 } 189 if ( ! $processor->next_tag( 'img' ) ) { 190 return $block_content; 191 } 192 193 $alt = $processor->get_attribute( 'alt' ); 194 $img_uploaded_src = $processor->get_attribute( 'src' ); 195 $img_class_names = $processor->get_attribute( 'class' ); 196 $img_styles = $processor->get_attribute( 'style' ); 197 $img_width = 'none'; 198 $img_height = 'none'; 199 $img_srcset = false; 200 $aria_label = __( 'Enlarge' ); 201 $dialog_aria_label = __( 'Enlarged image' ); 202 203 if ( isset( $block['attrs']['id'] ) ) { 204 $img_uploaded_src = wp_get_attachment_url( $block['attrs']['id'] ); 205 $img_metadata = wp_get_attachment_metadata( $block['attrs']['id'] ); 206 $img_srcset = wp_get_attachment_image_srcset( $block['attrs']['id'] ); 207 $img_width = $img_metadata['width'] ?? 'none'; 208 $img_height = $img_metadata['height'] ?? 'none'; 209 } 210 211 // Figure. 212 $processor->seek( 'figure' ); 213 $figure_class_names = $processor->get_attribute( 'class' ); 214 $figure_styles = $processor->get_attribute( 'style' ); 215 216 // Create unique id and set the image metadata in the state. 217 $unique_image_id = uniqid(); 218 219 wp_interactivity_state( 220 'core/image', 221 array( 222 'metadata' => array( 223 $unique_image_id => array( 224 'uploadedSrc' => $img_uploaded_src, 225 'lightboxSrcset' => $img_srcset, 226 'figureClassNames' => $figure_class_names, 227 'figureStyles' => $figure_styles, 228 'imgClassNames' => $img_class_names, 229 'imgStyles' => $img_styles, 230 'targetWidth' => $img_width, 231 'targetHeight' => $img_height, 232 'scaleAttr' => $block['attrs']['scale'] ?? false, 233 'ariaLabel' => $dialog_aria_label, 234 'alt' => $alt, 235 ), 236 ), 237 ) 238 ); 239 240 $processor->add_class( 'wp-lightbox-container' ); 241 $processor->set_attribute( 'data-wp-interactive', 'core/image' ); 242 $processor->set_attribute( 243 'data-wp-context', 244 wp_json_encode( 245 array( 246 'imageId' => $unique_image_id, 247 ), 248 JSON_HEX_TAG | JSON_HEX_APOS | JSON_HEX_QUOT | JSON_HEX_AMP 249 ) 250 ); 251 $processor->set_attribute( 'data-wp-key', $unique_image_id ); 252 253 // Image. 254 $processor->next_tag( 'img' ); 255 $processor->set_attribute( 'data-wp-init', 'callbacks.setButtonStyles' ); 256 $processor->set_attribute( 'data-wp-on--load', 'callbacks.setButtonStyles' ); 257 $processor->set_attribute( 'data-wp-on-window--resize', 'callbacks.setButtonStyles' ); 258 259 // Set an event to preload the image on pointerenter and pointerdown(mobile). 260 // Pointerleave is used to cancel the preload if the user hovers away from the image 261 // before the predefined delay. 262 $processor->set_attribute( 'data-wp-on--pointerenter', 'actions.preloadImageWithDelay' ); 263 $processor->set_attribute( 'data-wp-on--pointerdown', 'actions.preloadImage' ); 264 $processor->set_attribute( 'data-wp-on--pointerleave', 'actions.cancelPreload' ); 265 266 // Sets an event callback on the `img` because the `figure` element can also 267 // contain a caption, and we don't want to trigger the lightbox when the 268 // caption is clicked. 269 $processor->set_attribute( 'data-wp-on--click', 'actions.showLightbox' ); 270 $processor->set_attribute( 'data-wp-class--hide', 'state.isContentHidden' ); 271 $processor->set_attribute( 'data-wp-class--show', 'state.isContentVisible' ); 272 273 $body_content = $processor->get_updated_html(); 274 275 // Adds a button alongside image in the body content. 276 $img = null; 277 preg_match( '/<img[^>]+>/', $body_content, $img ); 278 279 $button = 280 $img[0] 281 . '<button 282 class="lightbox-trigger" 283 type="button" 284 aria-haspopup="dialog" 285 aria-label="' . esc_attr( $aria_label ) . '" 286 data-wp-init="callbacks.initTriggerButton" 287 data-wp-on--click="actions.showLightbox" 288 data-wp-style--right="state.imageButtonRight" 289 data-wp-style--top="state.imageButtonTop" 290 > 291 <svg xmlns="http://www.w3.org/2000/svg" width="12" height="12" fill="none" viewBox="0 0 12 12"> 292 <path fill="#fff" d="M2 0a2 2 0 0 0-2 2v2h1.5V2a.5.5 0 0 1 .5-.5h2V0H2Zm2 10.5H2a.5.5 0 0 1-.5-.5V8H0v2a2 2 0 0 0 2 2h2v-1.5ZM8 12v-1.5h2a.5.5 0 0 0 .5-.5V8H12v2a2 2 0 0 1-2 2H8Zm2-12a2 2 0 0 1 2 2v2h-1.5V2a.5.5 0 0 0-.5-.5H8V0h2Z" /> 293 </svg> 294 </button>'; 295 296 $body_content = preg_replace( '/<img[^>]+>/', $button, $body_content ); 297 298 add_action( 'wp_footer', 'block_core_image_print_lightbox_overlay' ); 299 300 return $body_content; 301 } 302 303 /** 304 * @since 6.5.0 305 */ 306 function block_core_image_print_lightbox_overlay() { 307 $close_button_label = esc_attr__( 'Close' ); 308 309 // If the current theme does NOT have a `theme.json`, or the colors are not 310 // defined, it needs to set the background color & close button color to some 311 // default values because it can't get them from the Global Styles. 312 $background_color = '#fff'; 313 $close_button_color = '#000'; 314 if ( wp_theme_has_theme_json() ) { 315 $global_styles_color = wp_get_global_styles( array( 'color' ) ); 316 if ( ! empty( $global_styles_color['background'] ) ) { 317 $background_color = esc_attr( $global_styles_color['background'] ); 318 } 319 if ( ! empty( $global_styles_color['text'] ) ) { 320 $close_button_color = esc_attr( $global_styles_color['text'] ); 321 } 322 } 323 324 echo <<<HTML 325 <div 326 class="wp-lightbox-overlay zoom" 327 data-wp-interactive="core/image" 328 data-wp-router-region='{ "id": "core/image-overlay", "attachTo": "body" }' 329 data-wp-key="wp-lightbox-overlay" 330 data-wp-context='{}' 331 data-wp-bind--role="state.roleAttribute" 332 data-wp-bind--aria-label="state.currentImage.ariaLabel" 333 data-wp-bind--aria-modal="state.ariaModal" 334 data-wp-class--active="state.overlayEnabled" 335 data-wp-class--show-closing-animation="state.overlayOpened" 336 data-wp-watch="callbacks.setOverlayFocus" 337 data-wp-on--keydown="actions.handleKeydown" 338 data-wp-on--touchstart="actions.handleTouchStart" 339 data-wp-on--touchmove="actions.handleTouchMove" 340 data-wp-on--touchend="actions.handleTouchEnd" 341 data-wp-on--click="actions.hideLightbox" 342 data-wp-on-window--resize="callbacks.setOverlayStyles" 343 data-wp-on-window--scroll="actions.handleScroll" 344 data-wp-bind--style="state.overlayStyles" 345 tabindex="-1" 346 > 347 <button type="button" aria-label="$close_button_label" style="fill: $close_button_color" class="close-button"> 348 <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" width="20" height="20" aria-hidden="true" focusable="false"><path d="m13.06 12 6.47-6.47-1.06-1.06L12 10.94 5.53 4.47 4.47 5.53 10.94 12l-6.47 6.47 1.06 1.06L12 13.06l6.47 6.47 1.06-1.06L13.06 12Z"></path></svg> 349 </button> 350 <div class="lightbox-image-container"> 351 <figure data-wp-bind--class="state.currentImage.figureClassNames" data-wp-bind--style="state.figureStyles"> 352 <img data-wp-bind--alt="state.currentImage.alt" data-wp-bind--class="state.currentImage.imgClassNames" data-wp-bind--style="state.imgStyles" data-wp-bind--src="state.currentImage.currentSrc"> 353 </figure> 354 </div> 355 <div class="lightbox-image-container"> 356 <figure data-wp-bind--class="state.currentImage.figureClassNames" data-wp-bind--style="state.figureStyles"> 357 <img 358 data-wp-bind--alt="state.currentImage.alt" 359 data-wp-bind--class="state.currentImage.imgClassNames" 360 data-wp-bind--style="state.imgStyles" 361 data-wp-bind--src="state.enlargedSrc" 362 data-wp-bind--srcset="state.enlargedSrcset" 363 sizes="100vw" 364 > 365 </figure> 366 </div> 367 <div class="scrim" style="background-color: $background_color" aria-hidden="true"></div> 368 </div> 369 HTML; 370 } 371 372 /** 373 * Registers the `core/image` block on server. 374 * 375 * @since 5.9.0 376 */ 377 function register_block_core_image() { 378 register_block_type_from_metadata( 379 __DIR__ . '/image', 380 array( 381 'render_callback' => 'render_block_core_image', 382 ) 383 ); 384 } 385 add_action( 'init', 'register_block_core_image' );
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| Generated : Sat May 16 08:20:03 2026 | Cross-referenced by PHPXref |