87 lines
3.1 KiB
PHP
87 lines
3.1 KiB
PHP
<?php
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/**
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* Server-side rendering of the `core/gallery` block.
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*
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* @package WordPress
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*/
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/**
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* Handles backwards compatibility for Gallery Blocks,
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* whose images feature a `data-id` attribute.
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*
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* Now that the Gallery Block contains inner Image Blocks,
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* we add a custom `data-id` attribute before rendering the gallery
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* so that the Image Block can pick it up in its render_callback.
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*
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* @param array $parsed_block The block being rendered.
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* @return array The migrated block object.
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*/
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function block_core_gallery_data_id_backcompatibility( $parsed_block ) {
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if ( 'core/gallery' === $parsed_block['blockName'] ) {
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foreach ( $parsed_block['innerBlocks'] as $key => $inner_block ) {
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if ( 'core/image' === $inner_block['blockName'] ) {
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if ( ! isset( $parsed_block['innerBlocks'][ $key ]['attrs']['data-id'] ) && isset( $inner_block['attrs']['id'] ) ) {
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$parsed_block['innerBlocks'][ $key ]['attrs']['data-id'] = esc_attr( $inner_block['attrs']['id'] );
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}
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}
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}
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}
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return $parsed_block;
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}
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add_filter( 'render_block_data', 'block_core_gallery_data_id_backcompatibility' );
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/**
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* Adds a style tag for the --wp--style--unstable-gallery-gap var.
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*
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* The Gallery block needs to recalculate Image block width based on
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* the current gap setting in order to maintain the number of flex columns
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* so a css var is added to allow this.
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*
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* @param array $attributes Attributes of the block being rendered.
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* @param string $content Content of the block being rendered.
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* @return string The content of the block being rendered.
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*/
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function block_core_gallery_render( $attributes, $content ) {
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$gap = _wp_array_get( $attributes, array( 'style', 'spacing', 'blockGap' ) );
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// Skip if gap value contains unsupported characters.
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// Regex for CSS value borrowed from `safecss_filter_attr`, and used here
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// because we only want to match against the value, not the CSS attribute.
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$gap = preg_match( '%[\\\(&=}]|/\*%', $gap ) ? null : $gap;
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$class = wp_unique_id( 'wp-block-gallery-' );
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$content = preg_replace(
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'/' . preg_quote( 'class="', '/' ) . '/',
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'class="' . $class . ' ',
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$content,
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1
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);
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// --gallery-block--gutter-size is deprecated. --wp--style--gallery-gap-default should be used by themes that want to set a default
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// gap on the gallery.
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$gap_value = $gap ? $gap : 'var( --wp--style--gallery-gap-default, var( --gallery-block--gutter-size, var( --wp--style--block-gap, 0.5em ) ) )';
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$style = '.' . $class . '{ --wp--style--unstable-gallery-gap: ' . $gap_value . '; gap: ' . $gap_value . '}';
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// Ideally styles should be loaded in the head, but blocks may be parsed
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// after that, so loading in the footer for now.
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// See https://core.trac.wordpress.org/ticket/53494.
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add_action(
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'wp_footer',
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function () use ( $style ) {
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echo '<style> ' . $style . '</style>';
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}
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);
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return $content;
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}
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/**
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* Registers the `core/gallery` block on server.
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*/
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function register_block_core_gallery() {
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register_block_type_from_metadata(
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__DIR__ . '/gallery',
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array(
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'render_callback' => 'block_core_gallery_render',
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)
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);
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}
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add_action( 'init', 'register_block_core_gallery' );
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