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<?php
/**
* Server-side rendering of the `core/cover` block.
*
* @package WordPress
*/
/**
* Renders the `core/cover` block on server.
*
* @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;
}
if ( ! ( $attributes['hasParallax'] || $attributes['isRepeated'] ) ) {
$attr = array(
'class' => 'wp-block-cover__image-background',
'data-object-fit' => 'cover',
);
if ( isset( $attributes['focalPoint'] ) ) {
$object_position = round( $attributes['focalPoint']['x'] * 100 ) . '% ' . round( $attributes['focalPoint']['y'] * 100 ) . '%';
$attr['data-object-position'] = $object_position;
$attr['style'] = 'object-position: ' . $object_position;
}
$image = get_the_post_thumbnail( null, 'post-thumbnail', $attr );
/*
* 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 );
}
} else {
if ( in_the_loop() ) {
update_post_thumbnail_cache();
}
$current_featured_image = get_the_post_thumbnail_url();
if ( ! $current_featured_image ) {
return $content;
}
$processor = new WP_HTML_Tag_Processor( $content );
$processor->next_tag();
$styles = $processor->get_attribute( 'style' );
$merged_styles = ! empty( $styles ) ? $styles . ';' : '';
$merged_styles .= 'background-image:url(' . esc_url( $current_featured_image ) . ');';
$processor->set_attribute( 'style', $merged_styles );
$content = $processor->get_updated_html();
}
return $content;
}
/**
* Registers the `core/cover` block renderer on server.
*/
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' );
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