<?php
/**
* Server-side rendering of the `core/cover` block.
*
* @package WordPress
*/
/**
* Renders the `core/cover` block on server.
*
* @since 6.0.0
*
* @param array $attributes The block attributes.
* @param string $content The block rendered content.
*
* @return string Returns the cover block markup, if useFeaturedImage is true.
*/
function render_block_core_cover( $attributes, $content ) {
if ( 'image' !== $attributes['backgroundType'] || false === $attributes['useFeaturedImage'] ) {
return $content;
}
$object_position = isset( $attributes['focalPoint'] )
? round( $attributes['focalPoint']['x'] * 100 ) . '% ' . round( $attributes['focalPoint']['y'] * 100 ) . '%'
: null;
if ( ! ( $attributes['hasParallax'] || $attributes['isRepeated'] ) ) {
$attr = array(
'class' => 'wp-block-cover__image-background',
'data-object-fit' => 'cover',
);
if ( $object_position ) {
$attr['data-object-position'] = $object_position;
$attr['style'] = 'object-position:' . $object_position . ';';
}
$image = get_the_post_thumbnail( null, $attributes['sizeSlug'] ?? 'post-thumbnail', $attr );
} else {
if ( in_the_loop() ) {
update_post_thumbnail_cache();
}
$current_featured_image = get_the_post_thumbnail_url( null, $attributes['sizeSlug'] ?? null );
if ( ! $current_featured_image ) {
return $content;
}
$current_thumbnail_id = get_post_thumbnail_id();
$processor = new WP_HTML_Tag_Processor( '<div></div>' );
$processor->next_tag();
$current_alt = trim( strip_tags( get_post_meta( $current_thumbnail_id, '_wp_attachment_image_alt', true ) ) );
if ( $current_alt ) {
$processor->set_attribute( 'role', 'img' );
$processor->set_attribute( 'aria-label', $current_alt );
}
$processor->add_class( 'wp-block-cover__image-background' );
$processor->add_class( 'wp-image-' . $current_thumbnail_id );
if ( $attributes['hasParallax'] ) {
$processor->add_class( 'has-parallax' );
}
if ( $attributes['isRepeated'] ) {
$processor->add_class( 'is-repeated' );
}
$styles = 'background-position:' . ( $object_position ?? '50% 50%' ) . ';';
$styles .= 'background-image:url(' . esc_url( $current_featured_image ) . ');';
$processor->set_attribute( 'style', $styles );
$image = $processor->get_updated_html();
}
/*
* Inserts the featured image between the (1st) cover 'background' `span` and 'inner_container' `div`,
* and removes eventual whitespace characters between the two (typically introduced at template level)
*/
$inner_container_start = '/<div\b[^>]+wp-block-cover__inner-container[\s|"][^>]*>/U';
if ( 1 === preg_match( $inner_container_start, $content, $matches, PREG_OFFSET_CAPTURE ) ) {
$offset = $matches[0][1];
$content = substr( $content, 0, $offset ) . $image . substr( $content, $offset );
}
return $content;
}
/**
* Registers the `core/cover` block renderer on server.
*
* @since 6.0.0
*/
function register_block_core_cover() {
register_block_type_from_metadata(
__DIR__ . '/cover',
array(
'render_callback' => 'render_block_core_cover',
)
);
}
add_action( 'init', 'register_block_core_cover' );