$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 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. * * @param array $attributes Attributes of the block being rendered. * @param string $content Content of the block being rendered. * @return string The content of the block being rendered. */ function block_core_gallery_render( $attributes, $content ) { $gap = _wp_array_get( $attributes, array( 'style', 'spacing', 'blockGap' ) ); // 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. $gap = preg_match( '%[\\\(&=}]|/\*%', $gap ) ? null : $gap; $class = wp_unique_id( 'wp-block-gallery-' ); $content = preg_replace( '/' . preg_quote( 'class="', '/' ) . '/', 'class="' . $class . ' ', $content, 1 ); // --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. $gap_value = $gap ? $gap : 'var( --wp--style--gallery-gap-default, var( --gallery-block--gutter-size, var( --wp--style--block-gap, 0.5em ) ) )'; $style = '.' . $class . '{ --wp--style--unstable-gallery-gap: ' . $gap_value . '; gap: ' . $gap_value . '}'; // Ideally styles should be loaded in the head, but blocks may be parsed // after that, so loading in the footer for now. // See https://core.trac.wordpress.org/ticket/53494. add_action( 'wp_footer', function () use ( $style ) { echo ''; } ); return $content; } /** * Registers the `core/gallery` block on server. */ 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' );