<?php
/**
* Server-side rendering of the `core/image` block.
*
* @package WordPress
*/
/**
* Renders the `core/image` block on the server,
* adding a data-id attribute to the element if core/gallery has added on pre-render.
*
* @param array $attributes The block attributes.
* @param string $content The block content.
* @param WP_Block $block The block object.
*
* @return string The block content with the data-id attribute added.
*/
function render_block_core_image( $attributes, $content, $block ) {
if ( false === stripos( $content, '<img' ) ) {
return '';
}
$p = new WP_HTML_Tag_Processor( $content );
if ( ! $p->next_tag( 'img' ) || null === $p->get_attribute( 'src' ) ) {
return '';
}
if ( isset( $attributes['data-id'] ) ) {
// Adds the data-id="$id" attribute to the img element to provide backwards
// compatibility for the Gallery Block, which now wraps Image Blocks within
// innerBlocks. The data-id attribute is added in a core/gallery
// `render_block_data` hook.
$p->set_attribute( 'data-id', $attributes['data-id'] );
}
$link_destination = isset( $attributes['linkDestination'] ) ? $attributes['linkDestination'] : 'none';
$lightbox_settings = block_core_image_get_lightbox_settings( $block->parsed_block );
/*
* If the lightbox is enabled and the image is not linked, adds the filter and
* the JavaScript view file.
*/
if (
isset( $lightbox_settings ) &&
'none' === $link_destination &&
isset( $lightbox_settings['enabled'] ) &&
true === $lightbox_settings['enabled']
) {
$suffix = wp_scripts_get_suffix();
if ( defined( 'IS_GUTENBERG_PLUGIN' ) && IS_GUTENBERG_PLUGIN ) {
$module_url = gutenberg_url( '/build/interactivity/image.min.js' );
}
wp_register_script_module(
'@wordpress/block-library/image',
isset( $module_url ) ? $module_url : includes_url( "blocks/image/view{$suffix}.js" ),
array( '@wordpress/interactivity' ),
defined( 'GUTENBERG_VERSION' ) ? GUTENBERG_VERSION : get_bloginfo( 'version' )
);
wp_enqueue_script_module( '@wordpress/block-library/image' );
/*
* This render needs to happen in a filter with priority 15 to ensure that
* it runs after the duotone filter and that duotone styles are applied to
* the image in the lightbox. Lightbox has to work with any plugins that
* might use filters as well. Removing this can be considered in the future
* if the way the blocks are rendered changes, or if a new kind of filter is
* introduced.
*/
add_filter( 'render_block_core/image', 'block_core_image_render_lightbox', 15, 2 );
} else {
/*
* Remove the filter if previously added by other Image blocks.
*/
remove_filter( 'render_block_core/image', 'block_core_image_render_lightbox', 15 );
}
return $p->get_updated_html();
}
/**
* Adds the lightboxEnabled flag to the block data.
*
* This is used to determine whether the lightbox should be rendered or not.
*
* @param array $block Block data.
*
* @return array Filtered block data.
*/
function block_core_image_get_lightbox_settings( $block ) {
// Gets the lightbox setting from the block attributes.
if ( isset( $block['attrs']['lightbox'] ) ) {
$lightbox_settings = $block['attrs']['lightbox'];
}
if ( ! isset( $lightbox_settings ) ) {
$lightbox_settings = wp_get_global_settings( array( 'lightbox' ), array( 'block_name' => 'core/image' ) );
// If not present in global settings, check the top-level global settings.
//
// NOTE: If no block-level settings are found, the previous call to
// `wp_get_global_settings` will return the whole `theme.json` structure in
// which case we can check if the "lightbox" key is present at the top-level
// of the global settings and use its value.
if ( isset( $lightbox_settings['lightbox'] ) ) {
$lightbox_settings = wp_get_global_settings( array( 'lightbox' ) );
}
}
return $lightbox_settings ?? null;
}
/**
* Adds the directives and layout needed for the lightbox behavior.
*
* @param string $block_content Rendered block content.
* @param array $block Block object.