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wp-includes/blocks/image.php
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290
wp-includes/blocks/image.php
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<?php
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/**
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* Server-side rendering of the `core/image` block.
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*
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* @package WordPress
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*/
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/**
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* Renders the `core/image` block on the server,
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* adding a data-id attribute to the element if core/gallery has added on pre-render.
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*
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* @param array $attributes The block attributes.
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* @param string $content The block content.
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* @param WP_Block $block The block object.
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*
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* @return string The block content with the data-id attribute added.
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*/
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function render_block_core_image( $attributes, $content, $block ) {
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if ( false === stripos( $content, '<img' ) ) {
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return '';
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}
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$p = new WP_HTML_Tag_Processor( $content );
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if ( ! $p->next_tag( 'img' ) || null === $p->get_attribute( 'src' ) ) {
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return '';
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}
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if ( isset( $attributes['data-id'] ) ) {
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// Adds the data-id="$id" attribute to the img element to provide backwards
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// compatibility for the Gallery Block, which now wraps Image Blocks within
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// innerBlocks. The data-id attribute is added in a core/gallery
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// `render_block_data` hook.
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$p->set_attribute( 'data-id', $attributes['data-id'] );
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}
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$link_destination = isset( $attributes['linkDestination'] ) ? $attributes['linkDestination'] : 'none';
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$lightbox_settings = block_core_image_get_lightbox_settings( $block->parsed_block );
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/*
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* If the lightbox is enabled and the image is not linked, adds the filter and
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* the JavaScript view file.
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*/
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if (
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isset( $lightbox_settings ) &&
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'none' === $link_destination &&
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isset( $lightbox_settings['enabled'] ) &&
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true === $lightbox_settings['enabled']
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) {
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$suffix = wp_scripts_get_suffix();
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if ( defined( 'IS_GUTENBERG_PLUGIN' ) && IS_GUTENBERG_PLUGIN ) {
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$module_url = gutenberg_url( '/build/interactivity/image.min.js' );
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}
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wp_register_script_module(
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'@wordpress/block-library/image',
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isset( $module_url ) ? $module_url : includes_url( "blocks/image/view{$suffix}.js" ),
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array( '@wordpress/interactivity' ),
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defined( 'GUTENBERG_VERSION' ) ? GUTENBERG_VERSION : get_bloginfo( 'version' )
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);
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wp_enqueue_script_module( '@wordpress/block-library/image' );
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/*
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* This render needs to happen in a filter with priority 15 to ensure that
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* it runs after the duotone filter and that duotone styles are applied to
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* the image in the lightbox. Lightbox has to work with any plugins that
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* might use filters as well. Removing this can be considered in the future
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* if the way the blocks are rendered changes, or if a new kind of filter is
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* introduced.
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*/
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add_filter( 'render_block_core/image', 'block_core_image_render_lightbox', 15, 2 );
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} else {
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/*
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* Remove the filter if previously added by other Image blocks.
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*/
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remove_filter( 'render_block_core/image', 'block_core_image_render_lightbox', 15 );
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}
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return $p->get_updated_html();
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}
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/**
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* Adds the lightboxEnabled flag to the block data.
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*
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* This is used to determine whether the lightbox should be rendered or not.
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*
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* @param array $block Block data.
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*
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* @return array Filtered block data.
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*/
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function block_core_image_get_lightbox_settings( $block ) {
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// Gets the lightbox setting from the block attributes.
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if ( isset( $block['attrs']['lightbox'] ) ) {
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$lightbox_settings = $block['attrs']['lightbox'];
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}
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if ( ! isset( $lightbox_settings ) ) {
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$lightbox_settings = wp_get_global_settings( array( 'lightbox' ), array( 'block_name' => 'core/image' ) );
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// If not present in global settings, check the top-level global settings.
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//
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// NOTE: If no block-level settings are found, the previous call to
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// `wp_get_global_settings` will return the whole `theme.json` structure in
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// which case we can check if the "lightbox" key is present at the top-level
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// of the global settings and use its value.
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if ( isset( $lightbox_settings['lightbox'] ) ) {
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$lightbox_settings = wp_get_global_settings( array( 'lightbox' ) );
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}
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}
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return $lightbox_settings ?? null;
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}
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/**
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* Adds the directives and layout needed for the lightbox behavior.
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*
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* @param string $block_content Rendered block content.
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* @param array $block Block object.
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*
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* @return string Filtered block content.
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*/
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function block_core_image_render_lightbox( $block_content, $block ) {
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/*
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* If there's no IMG tag in the block then return the given block content
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* as-is. There's nothing that this code can knowingly modify to add the
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* lightbox behavior.
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*/
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$p = new WP_HTML_Tag_Processor( $block_content );
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if ( $p->next_tag( 'figure' ) ) {
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$p->set_bookmark( 'figure' );
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}
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if ( ! $p->next_tag( 'img' ) ) {
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return $block_content;
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}
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$alt = $p->get_attribute( 'alt' );
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$img_uploaded_src = $p->get_attribute( 'src' );
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$img_class_names = $p->get_attribute( 'class' );
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$img_styles = $p->get_attribute( 'style' );
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$img_width = 'none';
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$img_height = 'none';
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$aria_label = __( 'Enlarge image' );
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if ( $alt ) {
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/* translators: %s: Image alt text. */
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$aria_label = sprintf( __( 'Enlarge image: %s' ), $alt );
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}
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if ( isset( $block['attrs']['id'] ) ) {
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$img_uploaded_src = wp_get_attachment_url( $block['attrs']['id'] );
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$img_metadata = wp_get_attachment_metadata( $block['attrs']['id'] );
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$img_width = $img_metadata['width'] ?? 'none';
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$img_height = $img_metadata['height'] ?? 'none';
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}
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// Figure.
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$p->seek( 'figure' );
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$figure_class_names = $p->get_attribute( 'class' );
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$figure_styles = $p->get_attribute( 'style' );
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$p->add_class( 'wp-lightbox-container' );
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$p->set_attribute( 'data-wp-interactive', 'core/image' );
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$p->set_attribute(
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'data-wp-context',
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wp_json_encode(
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array(
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'uploadedSrc' => $img_uploaded_src,
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'figureClassNames' => $figure_class_names,
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'figureStyles' => $figure_styles,
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'imgClassNames' => $img_class_names,
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'imgStyles' => $img_styles,
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'targetWidth' => $img_width,
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'targetHeight' => $img_height,
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'scaleAttr' => $block['attrs']['scale'] ?? false,
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'ariaLabel' => $aria_label,
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'alt' => $alt,
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),
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JSON_HEX_TAG | JSON_HEX_APOS | JSON_HEX_QUOT | JSON_HEX_AMP
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)
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);
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// Image.
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$p->next_tag( 'img' );
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$p->set_attribute( 'data-wp-init', 'callbacks.setButtonStyles' );
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$p->set_attribute( 'data-wp-on--load', 'callbacks.setButtonStyles' );
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$p->set_attribute( 'data-wp-on-window--resize', 'callbacks.setButtonStyles' );
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// Sets an event callback on the `img` because the `figure` element can also
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// contain a caption, and we don't want to trigger the lightbox when the
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// caption is clicked.
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$p->set_attribute( 'data-wp-on--click', 'actions.showLightbox' );
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$body_content = $p->get_updated_html();
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// Adds a button alongside image in the body content.
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$img = null;
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preg_match( '/<img[^>]+>/', $body_content, $img );
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$button =
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$img[0]
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. '<button
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class="lightbox-trigger"
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type="button"
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aria-haspopup="dialog"
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aria-label="' . esc_attr( $aria_label ) . '"
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data-wp-init="callbacks.initTriggerButton"
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data-wp-on--click="actions.showLightbox"
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data-wp-style--right="context.imageButtonRight"
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data-wp-style--top="context.imageButtonTop"
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>
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<svg xmlns="http://www.w3.org/2000/svg" width="12" height="12" fill="none" viewBox="0 0 12 12">
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<path fill="#fff" d="M2 0a2 2 0 0 0-2 2v2h1.5V2a.5.5 0 0 1 .5-.5h2V0H2Zm2 10.5H2a.5.5 0 0 1-.5-.5V8H0v2a2 2 0 0 0 2 2h2v-1.5ZM8 12v-1.5h2a.5.5 0 0 0 .5-.5V8H12v2a2 2 0 0 1-2 2H8Zm2-12a2 2 0 0 1 2 2v2h-1.5V2a.5.5 0 0 0-.5-.5H8V0h2Z" />
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</svg>
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</button>';
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$body_content = preg_replace( '/<img[^>]+>/', $button, $body_content );
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add_action( 'wp_footer', 'block_core_image_print_lightbox_overlay' );
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return $body_content;
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}
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function block_core_image_print_lightbox_overlay() {
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$close_button_label = esc_attr__( 'Close' );
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// If the current theme does NOT have a `theme.json`, or the colors are not
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// defined, it needs to set the background color & close button color to some
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// default values because it can't get them from the Global Styles.
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$background_color = '#fff';
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$close_button_color = '#000';
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if ( wp_theme_has_theme_json() ) {
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$global_styles_color = wp_get_global_styles( array( 'color' ) );
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if ( ! empty( $global_styles_color['background'] ) ) {
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$background_color = esc_attr( $global_styles_color['background'] );
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}
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if ( ! empty( $global_styles_color['text'] ) ) {
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$close_button_color = esc_attr( $global_styles_color['text'] );
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}
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}
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echo <<<HTML
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<div
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class="wp-lightbox-overlay zoom"
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data-wp-interactive="core/image"
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data-wp-context='{}'
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data-wp-bind--role="state.roleAttribute"
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data-wp-bind--aria-label="state.currentImage.ariaLabel"
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data-wp-bind--aria-modal="state.ariaModal"
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data-wp-class--active="state.overlayEnabled"
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data-wp-class--show-closing-animation="state.showClosingAnimation"
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data-wp-watch="callbacks.setOverlayFocus"
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data-wp-on--keydown="actions.handleKeydown"
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data-wp-on--touchstart="actions.handleTouchStart"
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data-wp-on--touchmove="actions.handleTouchMove"
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data-wp-on--touchend="actions.handleTouchEnd"
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data-wp-on--click="actions.hideLightbox"
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data-wp-on-window--resize="callbacks.setOverlayStyles"
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data-wp-on-window--scroll="actions.handleScroll"
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tabindex="-1"
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>
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<button type="button" aria-label="$close_button_label" style="fill: $close_button_color" class="close-button">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" width="20" height="20" aria-hidden="true" focusable="false"><path d="M13 11.8l6.1-6.3-1-1-6.1 6.2-6.1-6.2-1 1 6.1 6.3-6.5 6.7 1 1 6.5-6.6 6.5 6.6 1-1z"></path></svg>
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</button>
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<div class="lightbox-image-container">
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<figure data-wp-bind--class="state.currentImage.figureClassNames" data-wp-bind--style="state.currentImage.figureStyles">
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<img data-wp-bind--alt="state.currentImage.alt" data-wp-bind--class="state.currentImage.imgClassNames" data-wp-bind--style="state.imgStyles" data-wp-bind--src="state.currentImage.currentSrc">
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</figure>
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</div>
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<div class="lightbox-image-container">
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<figure data-wp-bind--class="state.currentImage.figureClassNames" data-wp-bind--style="state.currentImage.figureStyles">
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<img data-wp-bind--alt="state.currentImage.alt" data-wp-bind--class="state.currentImage.imgClassNames" data-wp-bind--style="state.imgStyles" data-wp-bind--src="state.enlargedSrc">
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</figure>
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</div>
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<div class="scrim" style="background-color: $background_color" aria-hidden="true"></div>
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<style data-wp-text="state.overlayStyles"></style>
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</div>
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HTML;
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}
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/**
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* Registers the `core/image` block on server.
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*/
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function register_block_core_image() {
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register_block_type_from_metadata(
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__DIR__ . '/image',
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array(
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'render_callback' => 'render_block_core_image',
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)
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);
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}
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add_action( 'init', 'register_block_core_image' );
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