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Roman Pyrih
2026-05-21 15:33:11 +02:00
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wp-includes/blocks/gallery.php Normal file
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<?php
/**
* Server-side rendering of the `core/gallery` block.
*
* @package WordPress
*/
/**
* Handles backwards compatibility for Gallery Blocks,
* whose images feature a `data-id` attribute.
*
* Now that the Gallery Block contains inner Image Blocks,
* we add a custom `data-id` attribute before rendering the gallery
* so that the Image Block can pick it up in its render_callback.
*
* @since 5.9.0
*
* @param array $parsed_block The block being rendered.
* @return array The migrated block object.
*/
function block_core_gallery_data_id_backcompatibility( $parsed_block ) {
if ( 'core/gallery' === $parsed_block['blockName'] ) {
foreach ( $parsed_block['innerBlocks'] as $key => $inner_block ) {
if ( 'core/image' === $inner_block['blockName'] ) {
if ( ! isset( $parsed_block['innerBlocks'][ $key ]['attrs']['data-id'] ) && isset( $inner_block['attrs']['id'] ) ) {
$parsed_block['innerBlocks'][ $key ]['attrs']['data-id'] = esc_attr( $inner_block['attrs']['id'] );
}
}
}
}
return $parsed_block;
}
add_filter( 'render_block_data', 'block_core_gallery_data_id_backcompatibility' );
/**
* Adds a unique ID to the gallery block context.
*
* @since 7.0.0
*
* @param array $context Default context.
* @param array $parsed_block Block being rendered, filtered by render_block_data.
* @return array Filtered context.
*/
function block_core_gallery_render_context( $context, $parsed_block ) {
if ( 'core/gallery' === $parsed_block['blockName'] ) {
$context['galleryId'] = uniqid();
}
return $context;
}
add_filter( 'render_block_context', 'block_core_gallery_render_context', 10, 2 );
/**
* Renders the `core/gallery` block on the server.
*
* @since 6.0.0
*
* @param array $attributes Attributes of the block being rendered.
* @param string $content Content of the block being rendered.
* @param array $block The block instance being rendered.
* @return string The content of the block being rendered.
*/
function block_core_gallery_render( $attributes, $content, $block ) {
// Adds a style tag for the --wp--style--unstable-gallery-gap var.
// The Gallery block needs to recalculate Image block width based on
// the current gap setting in order to maintain the number of flex columns
// so a css var is added to allow this.
$gap = $attributes['style']['spacing']['blockGap'] ?? null;
// Skip if gap value contains unsupported characters.
// Regex for CSS value borrowed from `safecss_filter_attr`, and used here
// because we only want to match against the value, not the CSS attribute.
if ( is_array( $gap ) ) {
foreach ( $gap as $key => $value ) {
// Make sure $value is a string to avoid PHP 8.1 deprecation error in preg_match() when the value is null.
$value = is_string( $value ) ? $value : '';
$value = $value && preg_match( '%[\\\(&=}]|/\*%', $value ) ? null : $value;
// Get spacing CSS variable from preset value if provided.
if ( is_string( $value ) && str_contains( $value, 'var:preset|spacing|' ) ) {
$index_to_splice = strrpos( $value, '|' ) + 1;
$slug = _wp_to_kebab_case( substr( $value, $index_to_splice ) );
$value = "var(--wp--preset--spacing--$slug)";
}
$gap[ $key ] = $value;
}
} else {
// Make sure $gap is a string to avoid PHP 8.1 deprecation error in preg_match() when the value is null.
$gap = is_string( $gap ) ? $gap : '';
$gap = $gap && preg_match( '%[\\\(&=}]|/\*%', $gap ) ? null : $gap;
// Get spacing CSS variable from preset value if provided.
if ( is_string( $gap ) && str_contains( $gap, 'var:preset|spacing|' ) ) {
$index_to_splice = strrpos( $gap, '|' ) + 1;
$slug = _wp_to_kebab_case( substr( $gap, $index_to_splice ) );
$gap = "var(--wp--preset--spacing--$slug)";
}
}
$unique_gallery_classname = wp_unique_id( 'wp-block-gallery-' );
$processed_content = new WP_HTML_Tag_Processor( $content );
$processed_content->next_tag();
$processed_content->add_class( $unique_gallery_classname );
// --gallery-block--gutter-size is deprecated. --wp--style--gallery-gap-default should be used by themes that want to set a default
// gap on the gallery.
$fallback_gap = 'var( --wp--style--gallery-gap-default, var( --gallery-block--gutter-size, var( --wp--style--block-gap, 0.5em ) ) )';
$gap_value = $gap ? $gap : $fallback_gap;
$gap_column = $gap_value;
if ( is_array( $gap_value ) ) {
$gap_row = $gap_value['top'] ?? $fallback_gap;
$gap_column = $gap_value['left'] ?? $fallback_gap;
$gap_value = $gap_row === $gap_column ? $gap_row : $gap_row . ' ' . $gap_column;
}
// The unstable gallery gap calculation requires a real value (such as `0px`) and not `0`.
if ( '0' === $gap_column ) {
$gap_column = '0px';
}
// Set the CSS variable to the column value, and the `gap` property to the combined gap value.
$gallery_styles = array(
array(
'selector' => ".wp-block-gallery.{$unique_gallery_classname}",
'declarations' => array(
'--wp--style--unstable-gallery-gap' => $gap_column,
'gap' => $gap_value,
),
),
);
wp_style_engine_get_stylesheet_from_css_rules(
$gallery_styles,
array( 'context' => 'block-supports' )
);
// The WP_HTML_Tag_Processor class calls get_updated_html() internally
// when the instance is treated as a string, but here we explicitly
// convert it to a string.
$updated_content = $processed_content->get_updated_html();
/*
* Randomize the order of image blocks. Ideally we should shuffle
* the `$parsed_block['innerBlocks']` via the `render_block_data` hook.
* However, this hook doesn't apply inner block updates when blocks are
* nested.
* @todo In the future, if this hook supports updating innerBlocks in
* nested blocks, it should be refactored.
*
* @see: https://github.com/WordPress/gutenberg/pull/58733
*/
if ( ! empty( $attributes['randomOrder'] ) ) {
// This pattern matches figure elements with the `wp-block-image`
// class to avoid the gallery's wrapping `figure` element and
// extract images only.
$pattern = '/<figure[^>]*\bwp-block-image\b[^>]*>.*?<\/figure>/s';
preg_match_all( $pattern, $updated_content, $matches );
if ( $matches ) {
$image_blocks = $matches[0];
shuffle( $image_blocks );
$i = 0;
$updated_content = preg_replace_callback(
$pattern,
static function () use ( $image_blocks, &$i ) {
return $image_blocks[ $i++ ];
},
$updated_content
);
}
}
// Gets all image IDs from the state that match this gallery's ID.
$state = wp_interactivity_state( 'core/image' );
$gallery_id = $block->context['galleryId'] ?? null;
$image_ids = array();
// Extracts image IDs from state metadata that match the current gallery ID.
if ( isset( $gallery_id ) && isset( $state['metadata'] ) ) {
foreach ( $state['metadata'] as $image_id => $metadata ) {
if ( isset( $metadata['galleryId'] ) && $metadata['galleryId'] === $gallery_id ) {
$image_ids[] = $image_id;
}
}
}
// If there are image IDs associated with this gallery, set interactivity
// attributes and order metadata for lightbox navigation.
if ( ! empty( $image_ids ) ) {
$total = count( $image_ids );
$lightbox_index = 0;
$processor = new WP_HTML_Tag_Processor( $updated_content );
$processor->next_tag();
$processor->set_attribute( 'data-wp-interactive', 'core/gallery' );
$processor->set_attribute(
'data-wp-context',
wp_json_encode(
array( 'galleryId' => $gallery_id ),
JSON_HEX_TAG | JSON_HEX_APOS | JSON_HEX_QUOT | JSON_HEX_AMP
)
);
while ( $processor->next_tag( 'figure' ) ) {
$wp_key = $processor->get_attribute( 'data-wp-key' );
if ( $wp_key && isset( $state['metadata'][ $wp_key ] ) ) {
$alt = $state['metadata'][ $wp_key ]['alt'];
wp_interactivity_state(
'core/image',
array(
'metadata' => array(
$wp_key => array(
'customAriaLabel' => empty( $alt )
/* translators: %1$s: current image index, %2$s: total number of images */
? sprintf( __( 'Enlarged image %1$s of %2$s' ), $lightbox_index + 1, $total )
/* translators: %1$s: current image index, %2$s: total number of images, %3$s: Image alt text */
: sprintf( __( 'Enlarged image %1$s of %2$s: %3$s' ), $lightbox_index + 1, $total, $alt ),
/* translators: %1$s: current image index, %2$s: total number of images */
'triggerButtonAriaLabel' => sprintf( __( 'Enlarge %1$s of %2$s' ), $lightbox_index + 1, $total ),
'order' => $lightbox_index,
),
),
)
);
++$lightbox_index;
}
}
return $processor->get_updated_html();
}
return $updated_content;
}
/**
* Registers the `core/gallery` block on server.
*
* @since 5.9.0
*/
function register_block_core_gallery() {
register_block_type_from_metadata(
__DIR__ . '/gallery',
array(
'render_callback' => 'block_core_gallery_render',
)
);
}
add_action( 'init', 'register_block_core_gallery' );