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1 <?php 2 /** 3 * Server-side rendering of the `core/gallery` block. 4 * 5 * @package WordPress 6 */ 7 8 /** 9 * Handles backwards compatibility for Gallery Blocks, 10 * whose images feature a `data-id` attribute. 11 * 12 * Now that the Gallery Block contains inner Image Blocks, 13 * we add a custom `data-id` attribute before rendering the gallery 14 * so that the Image Block can pick it up in its render_callback. 15 * 16 * @since 5.9.0 17 * 18 * @param array $parsed_block The block being rendered. 19 * @return array The migrated block object. 20 */ 21 function block_core_gallery_data_id_backcompatibility( $parsed_block ) { 22 if ( 'core/gallery' === $parsed_block['blockName'] ) { 23 foreach ( $parsed_block['innerBlocks'] as $key => $inner_block ) { 24 if ( 'core/image' === $inner_block['blockName'] ) { 25 if ( ! isset( $parsed_block['innerBlocks'][ $key ]['attrs']['data-id'] ) && isset( $inner_block['attrs']['id'] ) ) { 26 $parsed_block['innerBlocks'][ $key ]['attrs']['data-id'] = esc_attr( $inner_block['attrs']['id'] ); 27 } 28 } 29 } 30 } 31 32 return $parsed_block; 33 } 34 35 add_filter( 'render_block_data', 'block_core_gallery_data_id_backcompatibility' ); 36 37 /** 38 * Adds a unique ID to the gallery block context. 39 * 40 * @since 7.0.0 41 * 42 * @param array $context Default context. 43 * @param array $parsed_block Block being rendered, filtered by render_block_data. 44 * @return array Filtered context. 45 */ 46 function block_core_gallery_render_context( $context, $parsed_block ) { 47 if ( 'core/gallery' === $parsed_block['blockName'] ) { 48 $context['galleryId'] = uniqid(); 49 } 50 return $context; 51 } 52 53 add_filter( 'render_block_context', 'block_core_gallery_render_context', 10, 2 ); 54 55 /** 56 * Returns the column gap value used for Gallery image width calculations. 57 * 58 * @since 7.1.0 59 * 60 * @param string|array|null $gap Gallery block gap value. 61 * @param string $fallback_gap Fallback gap value. 62 * @return string Gallery column gap value. 63 */ 64 function block_core_gallery_get_column_gap_value( $gap, $fallback_gap ) { 65 if ( is_array( $gap ) ) { 66 $gap = $gap['left'] ?? $fallback_gap; 67 } 68 69 // Make sure $gap is a string to avoid PHP 8.1 deprecation error in preg_match() when the value is null. 70 $gap = is_string( $gap ) ? $gap : ''; 71 72 // Skip if gap value contains unsupported characters. 73 // Regex for CSS value borrowed from `safecss_filter_attr`, and used here 74 // because we only want to match against the value, not the CSS attribute. 75 $gap = $gap && preg_match( '%[\\\(&=}]|/\*%', $gap ) ? null : $gap; 76 77 // Get spacing CSS variable from preset value if provided. 78 if ( is_string( $gap ) && str_contains( $gap, 'var:preset|spacing|' ) ) { 79 $index_to_splice = strrpos( $gap, '|' ) + 1; 80 $slug = _wp_to_kebab_case( substr( $gap, $index_to_splice ) ); 81 $gap = "var(--wp--preset--spacing--$slug)"; 82 } 83 84 $gap_column = ( null !== $gap && '' !== $gap ) ? $gap : $fallback_gap; 85 86 // The unstable gallery gap calculation requires a real value (such as `0px`) and not `0`. 87 return '0' === $gap_column ? '0px' : $gap_column; 88 } 89 90 /** 91 * Returns whether a value can be used as a Gallery aspect ratio. 92 * 93 * Aspect ratios are interpolated into a generated stylesheet instead of being 94 * set as an inline style, so only the numeric forms produced by aspect ratio 95 * presets (and `auto`) are accepted. A value from saved content that isn't one 96 * of those is ignored rather than emitted, so it can't close the rule early and 97 * inject declarations of its own. The editor applies the same restriction in 98 * `isValidGalleryAspectRatio()`. 99 * 100 * @since 7.1.0 101 * 102 * @param mixed $value Value to check. 103 * @return bool Whether the value is a valid aspect ratio. 104 */ 105 function block_core_gallery_is_valid_aspect_ratio( $value ) { 106 return is_string( $value ) && 1 === preg_match( '#^(auto|\d+(\.\d+)?(\s*/\s*\d+(\.\d+)?)?)$#', trim( $value ) ); 107 } 108 109 /** 110 * Returns Gallery-specific responsive aspect ratio rules for a viewport. 111 * 112 * Unlike the column and crop rules, these are not scoped to the Flex layout: 113 * the aspect ratio applies to the images in every Gallery layout. They also 114 * cover dynamic galleries, whose images are rendered by the Gallery rather than 115 * carrying their own block attributes. 116 * 117 * @since 7.1.0 118 * 119 * @param string $selector Gallery block selector. 120 * @param mixed $viewport_style Viewport style data. 121 * @param string $media_query Viewport media query. 122 * @return array[] Gallery responsive aspect ratio rules. 123 */ 124 function block_core_gallery_get_responsive_aspect_ratio_style_rules( $selector, $viewport_style, $media_query ) { 125 if ( ! is_array( $viewport_style ) || ! is_string( $media_query ) ) { 126 return array(); 127 } 128 129 $aspect_ratio = $viewport_style['aspectRatio'] ?? null; 130 if ( ! block_core_gallery_is_valid_aspect_ratio( $aspect_ratio ) ) { 131 return array(); 132 } 133 134 $aspect_ratio = trim( $aspect_ratio ); 135 136 /* 137 * The base aspect ratio is an inline style on each image, so these 138 * declarations have to be important to win for the viewport. 139 * 140 * Original cancels the base ratio, which means rolling the declaration out 141 * of the cascade rather than giving it a value. `auto` - and `initial`, 142 * `unset` and `revert`, which all compute to it - would override the 143 * `width`/`height` presentational hint that gives a lazy-loaded image its 144 * placeholder ratio, collapsing the image to zero height until it loads: 145 * the Featured Image bug fixed in #80386. `revert-layer` drops the 146 * declaration instead, so the image falls back to that hint while loading, 147 * to its natural ratio once loaded, and to any ratio a theme set in a lower 148 * cascade layer. `object-fit` is left as the base set it, so a cropped 149 * Gallery still crops. 150 */ 151 $declarations = 'auto' === $aspect_ratio 152 ? array( 'aspect-ratio' => 'revert-layer !important' ) 153 : array( 154 'aspect-ratio' => "{$aspect_ratio} !important", 155 'object-fit' => 'cover !important', 156 ); 157 158 return array( 159 array( 160 'selector' => "{$selector}.wp-block-gallery.has-nested-images figure.wp-block-image:not(#individual-image) img", 161 'declarations' => $declarations, 162 'rules_group' => $media_query, 163 ), 164 ); 165 } 166 167 /** 168 * Returns Gallery-specific responsive Flex rules for a viewport. 169 * 170 * @since 7.1.0 171 * 172 * @param string $selector Gallery block selector. 173 * @param mixed $viewport_style Viewport style data. 174 * @param string $media_query Viewport media query. 175 * @return array[] Gallery responsive Flex rules. 176 */ 177 function block_core_gallery_get_responsive_flex_style_rules( $selector, $viewport_style, $media_query ) { 178 if ( ! is_array( $viewport_style ) || ! is_string( $media_query ) ) { 179 return array(); 180 } 181 182 $rules = array(); 183 $gallery_selector = "{$selector}.wp-block-gallery.has-nested-images:where(.is-layout-flex)"; 184 $image_selector = "{$gallery_selector} figure.wp-block-image:not(#individual-image)"; 185 $columns = $viewport_style['columns'] ?? null; 186 187 if ( is_int( $columns ) && $columns >= 1 && $columns <= 8 ) { 188 $width = 1 === $columns 189 ? '100%' 190 : sprintf( 191 'calc((100%% - (var(--wp--style--unstable-gallery-gap, 16px) * %1$d)) / %2$d)', 192 $columns - 1, 193 $columns 194 ); 195 $rules[] = array( 196 'selector' => $image_selector, 197 'declarations' => array( 'width' => "{$width} !important" ), 198 'rules_group' => $media_query, 199 ); 200 } 201 202 $image_crop = $viewport_style['imageCrop'] ?? null; 203 if ( ! is_bool( $image_crop ) ) { 204 return $rules; 205 } 206 207 $rules[] = array( 208 'selector' => $image_selector, 209 'declarations' => $image_crop 210 ? array( 211 'align-self' => 'inherit !important', 212 'margin-bottom' => '0 !important', 213 ) 214 : array( 215 'align-self' => 'auto !important', 216 'margin-top' => '0 !important', 217 'margin-bottom' => 'auto !important', 218 ), 219 'rules_group' => $media_query, 220 ); 221 $rules[] = array( 222 'selector' => "{$image_selector} > div:not(.components-drop-zone)", 223 'declarations' => array( 'display' => $image_crop ? 'flex !important' : 'block !important' ), 224 'rules_group' => $media_query, 225 ); 226 $rules[] = array( 227 'selector' => "{$image_selector} > a", 228 'declarations' => array( 'display' => $image_crop ? 'flex !important' : 'inline-block !important' ), 229 'rules_group' => $media_query, 230 ); 231 $rules[] = array( 232 'selector' => "{$image_selector} a,{$image_selector} img", 233 'declarations' => $image_crop 234 ? array( 235 'width' => '100% !important', 236 'flex' => '1 0 0% !important', 237 'height' => '100% !important', 238 'object-fit' => 'cover !important', 239 ) 240 : array( 241 'width' => 'auto !important', 242 'flex' => '0 1 auto !important', 243 'height' => 'auto !important', 244 'object-fit' => 'fill !important', 245 ), 246 'rules_group' => $media_query, 247 ); 248 249 return $rules; 250 } 251 252 /** 253 * Resolves a Gallery block's `dynamicContent` to an ordered list of image 254 * attachment IDs. 255 * 256 * The `source` key is the dispatch discriminator and `args` holds the source's 257 * parameters. This `{ source, args }` shape mirrors the Block Bindings metadata 258 * shape so dynamic mode can migrate to an `innerBlocks` binding with minimal 259 * change. `core/attached-media` is a context-relative anchor (the post the gallery is 260 * rendered within); future sources translate their REST-named `args` (`author`, 261 * `categories`, `after`/`before`, `media_type`, etc.) into `WP_Query` arguments 262 * here. 263 * 264 * @since 7.0.0 265 * 266 * @param array $source The gallery's `dynamicContent` attribute. 267 * @param WP_Block $block The gallery block instance being rendered. 268 * @return int[] Ordered list of image attachment IDs. 269 */ 270 function block_core_gallery_resolve_dynamic_source( $source, $block ) { 271 if ( ! is_array( $source ) ) { 272 return array(); 273 } 274 275 $source_name = $source['source'] ?? null; 276 $args = isset( $source['args'] ) && is_array( $source['args'] ) ? $source['args'] : array(); 277 278 switch ( $source_name ) { 279 case 'core/attached-media': 280 // Prefer the post supplied via block context, falling back to the post 281 // being rendered. The fallback is what lets a post-bound template (e.g. 282 // `single`/`page`) resolve against the actual post at render time even 283 // though the editor has no concrete post to preview — the editor gates 284 // the dynamic-mode UI on that same context (see `use-dynamic-gallery.js`). 285 $post_id = $block->context['postId'] ?? get_the_ID(); 286 if ( ! $post_id ) { 287 return array(); 288 } 289 290 // Map the camelCase `args` (block-attribute convention) to WP_Query 291 // names, defaulting to the same order as the editor preview (see 292 // `dynamic-source.js`). Only REST-supported orderby values are 293 // allowed; `menu_order` is intentionally unsupported (it isn't a 294 // valid media REST `orderby`). 295 $orderby = $args['orderBy'] ?? 'date'; 296 if ( ! in_array( $orderby, array( 'date', 'title' ), true ) ) { 297 $orderby = 'date'; 298 } 299 $order = strtoupper( $args['order'] ?? 'desc' ) === 'ASC' ? 'ASC' : 'DESC'; 300 301 // Bound the number of resolved images until the gallery supports 302 // pagination. Kept in sync with the editor query's `per_page` cap; a 303 // case-insensitive grep for `max_images` finds both this and 304 // `MAX_IMAGES` in `dynamic-source.js`. 305 $max_images = 100; 306 307 $query = new WP_Query( 308 array( 309 'post_parent' => $post_id, 310 'post_type' => 'attachment', 311 'post_status' => 'inherit', 312 'post_mime_type' => 'image', 313 'orderby' => $orderby, 314 'order' => $order, 315 'posts_per_page' => $max_images, 316 'fields' => 'ids', 317 'no_found_rows' => true, 318 ) 319 ); 320 321 return array_map( 'intval', $query->posts ); 322 } 323 324 // Unknown or not-yet-implemented source type. 325 return array(); 326 } 327 328 /** 329 * Builds the link-related image block attributes for a dynamically rendered 330 * gallery image, mapping the gallery-wide `linkTo` setting onto a single image. 331 * 332 * Mirrors the editor's `getHrefAndDestination()` (see `gallery/utils.js`). 333 * 334 * @since 7.0.0 335 * 336 * @param int $attachment_id The image attachment ID. 337 * @param array $attributes The gallery block attributes. 338 * @return array Partial image block attributes (`href`, `linkDestination`, 339 * `linkTarget`, `rel`, `lightbox`). 340 */ 341 function block_core_gallery_dynamic_image_link_attributes( $attachment_id, $attributes ) { 342 $link_to = $attributes['linkTo'] ?? 'none'; 343 $attrs = array(); 344 345 switch ( $link_to ) { 346 // Gutenberg uses 'media'/'attachment'; WP Core uses 'file'/'post'. 347 case 'media': 348 case 'file': 349 $attrs['href'] = wp_get_attachment_url( $attachment_id ); 350 $attrs['linkDestination'] = 'media'; 351 break; 352 case 'attachment': 353 case 'post': 354 $attrs['href'] = get_attachment_link( $attachment_id ); 355 $attrs['linkDestination'] = 'attachment'; 356 break; 357 case 'lightbox': 358 $attrs['linkDestination'] = 'none'; 359 $attrs['lightbox'] = array( 'enabled' => true ); 360 break; 361 } 362 363 if ( ! empty( $attrs['href'] ) && '_blank' === ( $attributes['linkTarget'] ?? '' ) ) { 364 $attrs['linkTarget'] = '_blank'; 365 $attrs['rel'] = 'noopener'; 366 } 367 368 return $attrs; 369 } 370 371 /** 372 * Renders a single `core/image` block for a Gallery block running in dynamic 373 * mode, applying the gallery-wide settings that affect how an image renders. 374 * 375 * The image markup is generated here (via `wp_get_attachment_image()`) and 376 * rendered through a real `core/image` block instance so that the image block's 377 * own render callback and lightbox behavior run, and so the gallery's existing 378 * lightbox/interactivity post-processing can pick it up. 379 * 380 * @since 7.0.0 381 * 382 * @param int $attachment_id The image attachment ID. 383 * @param array $attributes The gallery block attributes. 384 * @param array $context Context to expose to the inner image block. 385 * @return string The rendered image block HTML, or an empty string on failure. 386 */ 387 function block_core_gallery_render_dynamic_image( $attachment_id, $attributes, $context ) { 388 $size_slug = $attributes['sizeSlug'] ?? 'large'; 389 $aspect_ratio = $attributes['aspectRatio'] ?? 'auto'; 390 391 $img_attr = array( 'class' => 'wp-image-' . $attachment_id ); 392 if ( $aspect_ratio && 'auto' !== $aspect_ratio ) { 393 // Run the aspect ratio through the same sanitization used for every other 394 // block inline style, so an unsafe value can't break out of the style 395 // attribute or inject additional markup. 396 $img_attr['style'] = safecss_filter_attr( 397 sprintf( 'aspect-ratio:%s;object-fit:cover;', $aspect_ratio ) 398 ); 399 } 400 401 $image_markup = wp_get_attachment_image( $attachment_id, $size_slug, false, $img_attr ); 402 if ( ! $image_markup ) { 403 return ''; 404 } 405 406 $image_attributes = array_merge( 407 array( 408 'id' => $attachment_id, 409 'data-id' => (string) $attachment_id, 410 'sizeSlug' => $size_slug, 411 ), 412 block_core_gallery_dynamic_image_link_attributes( $attachment_id, $attributes ) 413 ); 414 415 if ( $aspect_ratio && 'auto' !== $aspect_ratio ) { 416 $image_attributes['aspectRatio'] = $aspect_ratio; 417 $image_attributes['scale'] = 'cover'; 418 } 419 420 // Wrap in a link when the gallery links images somewhere. 421 if ( ! empty( $image_attributes['href'] ) ) { 422 $image_markup = sprintf( 423 '<a href="%1$s"%2$s%3$s>%4$s</a>', 424 esc_url( $image_attributes['href'] ), 425 isset( $image_attributes['linkTarget'] ) ? ' target="' . esc_attr( $image_attributes['linkTarget'] ) . '"' : '', 426 isset( $image_attributes['rel'] ) ? ' rel="' . esc_attr( $image_attributes['rel'] ) . '"' : '', 427 $image_markup 428 ); 429 } 430 431 // Use the raw caption (`post_excerpt`) so the frontend mirrors the editor 432 // preview, which builds the caption from the REST `caption.raw` value. Gap: 433 // the REST API exposes no caption run through `wp_get_attachment_caption`, so 434 // that filter isn't applied here either. 435 $attachment = get_post( $attachment_id ); 436 $caption = $attachment ? $attachment->post_excerpt : ''; 437 if ( '' !== $caption ) { 438 $image_markup .= sprintf( 439 '<figcaption class="wp-element-caption">%s</figcaption>', 440 wp_kses_post( $caption ) 441 ); 442 } 443 444 $figure = sprintf( 445 '<figure class="wp-block-image size-%1$s">%2$s</figure>', 446 esc_attr( $size_slug ), 447 $image_markup 448 ); 449 450 $image_block = array( 451 'blockName' => 'core/image', 452 'attrs' => $image_attributes, 453 'innerBlocks' => array(), 454 'innerHTML' => $figure, 455 'innerContent' => array( $figure ), 456 ); 457 458 return ( new WP_Block( $image_block, $context ) )->render(); 459 } 460 461 /** 462 * Renders the `core/gallery` block on the server. 463 * 464 * @since 6.0.0 465 * 466 * @param array $attributes Attributes of the block being rendered. 467 * @param string $content Content of the block being rendered. 468 * @param array $block The block instance being rendered. 469 * @return string The content of the block being rendered. 470 */ 471 function block_core_gallery_render( $attributes, $content, $block ) { 472 static $global_styles = null; 473 474 // Gallery blocks created before layout variations existed do not have an 475 // explicit layout attribute. Missing and malformed layout data therefore 476 // falls back to Flex so existing galleries retain their current appearance. 477 $layout = is_array( $attributes['layout'] ?? null ) ? $attributes['layout'] : array(); 478 $layout_type = $layout['type'] ?? null; 479 $is_flex_layout = ! is_string( $layout_type ) || '' === $layout_type || 'flex' === $layout_type; 480 481 // In dynamic mode the gallery's images are resolved at render time instead of 482 // being authored as inner blocks, so `save.jsx` persists at most the 483 // gallery-level caption — a bare `<figcaption>`, or nothing when there is no 484 // caption. Resolve the configured source to a list of attachments, render an 485 // image block for each, and build the gallery `<figure>` wrapper from scratch. 486 // The gap/randomOrder/lightbox post-processing below then runs over the 487 // constructed markup unchanged. 488 if ( ! empty( $attributes['dynamicContent'] ) ) { 489 $attachment_ids = block_core_gallery_resolve_dynamic_source( $attributes['dynamicContent'], $block ); 490 491 // Nothing resolved — no attachments, or an unrecognized source. Render 492 // nothing rather than an empty gallery wrapper; a saved caption is 493 // meaningless without images, so it is intentionally dropped too. 494 if ( empty( $attachment_ids ) ) { 495 return ''; 496 } 497 498 // The source query only fetched IDs (`fields => ids`), which skips 499 // WP_Query's cache priming. Each image rendered below reads the 500 // attachment post and its meta (via `wp_get_attachment_image()`, 501 // `get_post()`, etc.), so warm the post and meta caches in a single pair 502 // of queries up front instead of paying ~two queries per attachment. 503 // Term cache is left cold: the render path doesn't read attachment terms. 504 if ( count( $attachment_ids ) > 1 ) { 505 _prime_post_caches( $attachment_ids, false, true ); 506 } 507 508 // Expose the gallery's provided context (plus galleryId/postId/postType) 509 // to each image block, since these images are rendered outside the 510 // gallery's real inner-block tree. 511 $image_context = array_merge( 512 is_array( $block->context ) ? $block->context : array(), 513 array( 514 'allowResize' => $attributes['allowResize'] ?? false, 515 'imageCrop' => $attributes['imageCrop'] ?? true, 516 'fixedHeight' => $attributes['fixedHeight'] ?? true, 517 'navigationButtonType' => $attributes['navigationButtonType'] ?? 'icon', 518 ) 519 ); 520 521 $images_markup = ''; 522 foreach ( $attachment_ids as $attachment_id ) { 523 $images_markup .= block_core_gallery_render_dynamic_image( $attachment_id, $attributes, $image_context ); 524 } 525 526 // Build the wrapper rather than parsing/splicing saved markup. 527 // `get_block_wrapper_attributes()` supplies the block-support 528 // classes/styles (align, color, border, spacing, anchor id); the layout 529 // render filter adds the active layout classes downstream — the same way a 530 // static gallery's wrapper is composed (`useBlockProps.save()` plus that 531 // filter). Only the gallery-specific classes are added explicitly, and 532 // they mirror `save.jsx` (kept in sync deliberately — see that file). 533 $gallery_classes = 'wp-block-gallery has-nested-images'; 534 if ( $is_flex_layout ) { 535 $gallery_classes .= isset( $attributes['columns'] ) 536 ? ' columns-' . (int) $attributes['columns'] 537 : ' columns-default'; 538 if ( $attributes['imageCrop'] ?? true ) { 539 $gallery_classes .= ' is-cropped'; 540 } 541 } 542 $wrapper_attributes = get_block_wrapper_attributes( array( 'class' => $gallery_classes ) ); 543 544 // In dynamic mode `save.jsx` persists only the gallery-level caption, so 545 // `$content` is the saved `<figcaption>` (or empty). Append it after the 546 // resolved images — matching the static gallery's `{images}{caption}` 547 // order — without parsing it. 548 $content = sprintf( '<figure %s>%s%s</figure>', $wrapper_attributes, $images_markup, $content ); 549 } 550 551 $processed_content = new WP_HTML_Tag_Processor( $content ); 552 $processed_content->next_tag(); 553 554 $style_attr = is_array( $attributes['style'] ?? null ) 555 ? $attributes['style'] 556 : array(); 557 if ( 558 defined( 'IS_GUTENBERG_PLUGIN' ) && 559 IS_GUTENBERG_PLUGIN && 560 function_exists( 'gutenberg_resolve_style_state_aliases' ) 561 ) { 562 $style_attr = gutenberg_resolve_style_state_aliases( $style_attr, 'core/gallery' ); 563 } 564 565 $global_settings = wp_get_global_settings(); 566 $viewport_settings = $global_settings['viewport'] ?? null; 567 $responsive_media_queries = array(); 568 foreach ( array( 'WP_Theme_JSON_Gutenberg', 'WP_Theme_JSON' ) as $theme_json_class_name ) { 569 if ( method_exists( $theme_json_class_name, 'get_viewport_media_queries' ) ) { 570 $responsive_media_queries = $theme_json_class_name::get_viewport_media_queries( $viewport_settings ); 571 break; 572 } 573 } 574 575 // Columns and cropping are Flex-only, but the aspect ratio applies in every 576 // layout, so a Gallery with a viewport aspect ratio needs the per-instance 577 // stylesheet (and the class scoping it) even when it isn't a Flex Gallery. 578 $has_viewport_aspect_ratio = false; 579 foreach ( $responsive_media_queries as $breakpoint => $media_query ) { 580 $viewport_style = $style_attr[ $breakpoint ] ?? null; 581 if ( 582 is_array( $viewport_style ) && 583 block_core_gallery_is_valid_aspect_ratio( $viewport_style['aspectRatio'] ?? null ) 584 ) { 585 $has_viewport_aspect_ratio = true; 586 break; 587 } 588 } 589 590 /* 591 * Only generate the gap styles — and, when nothing else needs it, the unique 592 * classname that exists solely to scope them — if the theme has not opted out 593 * of layout styles. The responsive aspect ratio rules are not layout styles, 594 * so they keep rendering either way. 595 */ 596 $should_generate_gap_styles = $is_flex_layout && ! current_theme_supports( 'disable-layout-styles' ); 597 598 if ( $should_generate_gap_styles || $has_viewport_aspect_ratio ) { 599 $unique_gallery_classname = wp_unique_id( 'wp-block-gallery-' ); 600 $processed_content->add_class( $unique_gallery_classname ); 601 $gallery_styles = array(); 602 603 if ( $should_generate_gap_styles ) { 604 // Add a style tag for the --wp--style--unstable-gallery-gap var. The 605 // Gallery's custom Flex layout recalculates Image block widths based on 606 // the current gap so it can maintain the selected number of columns. 607 608 // --gallery-block--gutter-size is deprecated. --wp--style--gallery-gap-default should be used by themes that want to set a default 609 // gap on the gallery. 610 $fallback_gap = 'var( --wp--style--gallery-gap-default, var( --gallery-block--gutter-size, var( --wp--style--block-gap, 0.5em ) ) )'; 611 612 if ( null === $global_styles ) { 613 $global_styles = function_exists( 'wp_get_global_styles' ) ? wp_get_global_styles() : array(); 614 } 615 616 $global_gallery_styles = $global_styles['blocks']['core/gallery'] ?? array(); 617 $global_gallery_gap = $global_gallery_styles['spacing']['blockGap'] ?? $fallback_gap; 618 $has_block_gap = is_array( $style_attr['spacing'] ?? null ) && array_key_exists( 'blockGap', $style_attr['spacing'] ); 619 // Prefer the block's own gap value, then Gallery global styles. Missing 620 // values fall back to the Gallery blockGap default. 621 $block_gap = $has_block_gap 622 ? $style_attr['spacing']['blockGap'] 623 : $global_gallery_gap; 624 $gap_column = block_core_gallery_get_column_gap_value( $block_gap, $fallback_gap ); 625 626 // Set the CSS variable to the column value for Gallery's flex width calculations. 627 $gallery_styles[] = array( 628 'selector' => ".wp-block-gallery.{$unique_gallery_classname}", 629 'declarations' => array( 630 '--wp--style--unstable-gallery-gap' => $gap_column, 631 ), 632 ); 633 } 634 635 foreach ( $responsive_media_queries as $breakpoint => $media_query ) { 636 $viewport_style = $style_attr[ $breakpoint ] ?? null; 637 638 if ( $should_generate_gap_styles ) { 639 $has_viewport_block_gap = is_array( $viewport_style ) && 640 is_array( $viewport_style['spacing'] ?? null ) && 641 array_key_exists( 'blockGap', $viewport_style['spacing'] ); 642 $has_global_viewport_block_gap = is_array( $global_gallery_styles[ $breakpoint ]['spacing'] ?? null ) && 643 array_key_exists( 'blockGap', $global_gallery_styles[ $breakpoint ]['spacing'] ); 644 645 // Viewport-specific block values win. Gallery global viewport values 646 // only apply when the block has no base gap, so they do not override an instance value. 647 if ( $has_viewport_block_gap ) { 648 $viewport_gap = $viewport_style['spacing']['blockGap']; 649 } elseif ( ! $has_block_gap && $has_global_viewport_block_gap ) { 650 $viewport_gap = $global_gallery_styles[ $breakpoint ]['spacing']['blockGap']; 651 } else { 652 $viewport_gap = null; 653 } 654 655 if ( null !== $viewport_gap ) { 656 $gallery_styles[] = array( 657 'selector' => ".wp-block-gallery.{$unique_gallery_classname}", 658 'declarations' => array( 659 '--wp--style--unstable-gallery-gap' => block_core_gallery_get_column_gap_value( 660 $viewport_gap, 661 $fallback_gap 662 ), 663 ), 664 'rules_group' => $media_query, 665 ); 666 } 667 668 $gallery_styles = array_merge( 669 $gallery_styles, 670 block_core_gallery_get_responsive_flex_style_rules( 671 ".{$unique_gallery_classname}", 672 $viewport_style, 673 $media_query 674 ) 675 ); 676 } 677 678 $gallery_styles = array_merge( 679 $gallery_styles, 680 block_core_gallery_get_responsive_aspect_ratio_style_rules( 681 ".{$unique_gallery_classname}", 682 $viewport_style, 683 $media_query 684 ) 685 ); 686 } 687 688 wp_style_engine_get_stylesheet_from_css_rules( 689 $gallery_styles, 690 array( 'context' => 'block-supports' ) 691 ); 692 } 693 694 // The WP_HTML_Tag_Processor class calls get_updated_html() internally 695 // when the instance is treated as a string, but here we explicitly 696 // convert it to a string. 697 $updated_content = $processed_content->get_updated_html(); 698 699 /* 700 * Randomize the order of image blocks. Ideally we should shuffle 701 * the `$parsed_block['innerBlocks']` via the `render_block_data` hook. 702 * However, this hook doesn't apply inner block updates when blocks are 703 * nested. 704 * @todo In the future, if this hook supports updating innerBlocks in 705 * nested blocks, it should be refactored. 706 * 707 * @see: https://github.com/WordPress/gutenberg/pull/58733 708 */ 709 if ( ! empty( $attributes['randomOrder'] ) ) { 710 // This pattern matches figure elements with the `wp-block-image` 711 // class to avoid the gallery's wrapping `figure` element and 712 // extract images only. 713 $pattern = '/<figure[^>]*\bwp-block-image\b[^>]*>.*?<\/figure>/s'; 714 715 preg_match_all( $pattern, $updated_content, $matches ); 716 if ( $matches ) { 717 $image_blocks = $matches[0]; 718 shuffle( $image_blocks ); 719 720 $i = 0; 721 $updated_content = preg_replace_callback( 722 $pattern, 723 static function () use ( $image_blocks, &$i ) { 724 return $image_blocks[ $i++ ]; 725 }, 726 $updated_content 727 ); 728 } 729 } 730 731 // Gets all image IDs from the state that match this gallery's ID. 732 $state = wp_interactivity_state( 'core/image' ); 733 $gallery_id = $block->context['galleryId'] ?? null; 734 $image_ids = array(); 735 736 // Extracts image IDs from state metadata that match the current gallery ID. 737 if ( isset( $gallery_id ) && isset( $state['metadata'] ) ) { 738 foreach ( $state['metadata'] as $image_id => $metadata ) { 739 if ( isset( $metadata['galleryId'] ) && $metadata['galleryId'] === $gallery_id ) { 740 $image_ids[] = $image_id; 741 } 742 } 743 } 744 745 // If there are image IDs associated with this gallery, set interactivity 746 // attributes and order metadata for lightbox navigation. 747 if ( ! empty( $image_ids ) ) { 748 $total = count( $image_ids ); 749 $lightbox_index = 0; 750 $processor = new WP_HTML_Tag_Processor( $updated_content ); 751 $processor->next_tag(); 752 $processor->set_attribute( 'data-wp-interactive', 'core/gallery' ); 753 $processor->set_attribute( 754 'data-wp-context', 755 wp_json_encode( 756 array( 'galleryId' => $gallery_id ), 757 JSON_HEX_TAG | JSON_HEX_APOS | JSON_HEX_QUOT | JSON_HEX_AMP 758 ) 759 ); 760 while ( $processor->next_tag( 'figure' ) ) { 761 $wp_key = $processor->get_attribute( 'data-wp-key' ); 762 if ( $wp_key && isset( $state['metadata'][ $wp_key ] ) ) { 763 $alt = $state['metadata'][ $wp_key ]['alt']; 764 wp_interactivity_state( 765 'core/image', 766 array( 767 'metadata' => array( 768 $wp_key => array( 769 'customAriaLabel' => empty( $alt ) 770 /* translators: %1$s: current image index, %2$s: total number of images */ 771 ? sprintf( __( 'Enlarged image %1$s of %2$s' ), $lightbox_index + 1, $total ) 772 /* translators: %1$s: current image index, %2$s: total number of images, %3$s: Image alt text */ 773 : sprintf( __( 'Enlarged image %1$s of %2$s: %3$s' ), $lightbox_index + 1, $total, $alt ), 774 /* translators: %1$s: current image index, %2$s: total number of images */ 775 'triggerButtonAriaLabel' => sprintf( __( 'Enlarge %1$s of %2$s' ), $lightbox_index + 1, $total ), 776 'order' => $lightbox_index, 777 ), 778 ), 779 ) 780 ); 781 ++$lightbox_index; 782 } 783 } 784 return $processor->get_updated_html(); 785 } 786 787 return $updated_content; 788 } 789 790 /** 791 * Registers the `core/gallery` block on server. 792 * 793 * @since 5.9.0 794 */ 795 function register_block_core_gallery() { 796 register_block_type_from_metadata( 797 __DIR__ . '/gallery', 798 array( 799 'render_callback' => 'block_core_gallery_render', 800 ) 801 ); 802 } 803 804 add_action( 'init', 'register_block_core_gallery' );
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