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gallery.php
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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. * * @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 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 = $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 = isset( $gap_value['top'] ) ? $gap_value['top'] : $fallback_gap; $gap_column = isset( $gap_value['left'] ) ? $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', ) ); return (string) $processed_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' );