334 lines
13 KiB
PHP
334 lines
13 KiB
PHP
<?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( $content, '<img' ) ) {
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return '';
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}
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$processor = new WP_HTML_Tag_Processor( $content );
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if ( ! $processor->next_tag( 'img' ) || null === $processor->get_attribute( 'src' ) ) {
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return '';
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}
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if ( isset( $attributes['data-id'] ) ) {
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// Add the data-id="$id" attribute to the img element
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// to provide backwards compatibility for the Gallery Block,
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// which now wraps Image Blocks within innerBlocks.
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// The data-id attribute is added in a core/gallery `render_block_data` hook.
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$processor->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, add the filter
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* and 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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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
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* future if the way the blocks are rendered changes, or if a
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* new kind of filter is 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 $processor->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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// Get 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`
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// structure in which case we can check if the "lightbox" key is present at
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// the top-level 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 it's not possible that an IMG element exists then return the given
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* block content as-is. It may be that there's no actual image in the block
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* or it could be that another plugin already modified this HTML.
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*/
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if ( false === stripos( $block_content, '<img' ) ) {
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return $block_content;
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}
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$processor = new WP_HTML_Tag_Processor( $block_content );
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$aria_label = __( 'Enlarge image' );
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/*
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* If there's definitely no IMG element in the block then return the given
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* block content as-is. There's nothing that this code can knowingly modify
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* to add the lightbox behavior.
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*/
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if ( ! $processor->next_tag( 'img' ) ) {
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return $block_content;
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}
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$alt_attribute = $processor->get_attribute( 'alt' );
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// An empty alt attribute `alt=""` is valid for decorative images.
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if ( is_string( $alt_attribute ) ) {
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$alt_attribute = trim( $alt_attribute );
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}
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// It only makes sense to append the alt text to the button aria-label when the alt text is non-empty.
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if ( $alt_attribute ) {
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/* translators: %s: Image alt text. */
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$aria_label = sprintf( __( 'Enlarge image: %s' ), $alt_attribute );
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}
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// Currently, we are only enabling the zoom animation.
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$lightbox_animation = 'zoom';
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// Note: We want to store the `src` in the context so we
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// can set it dynamically when the lightbox is opened.
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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 = $img_metadata['height'] ?? 'none';
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} else {
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$img_uploaded_src = $processor->get_attribute( 'src' );
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$img_width = 'none';
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$img_height = 'none';
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}
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if ( isset( $block['attrs']['scale'] ) ) {
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$scale_attr = $block['attrs']['scale'];
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} else {
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$scale_attr = false;
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}
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$w = new WP_HTML_Tag_Processor( $block_content );
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$w->next_tag( 'figure' );
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$w->add_class( 'wp-lightbox-container' );
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$w->set_attribute( 'data-wp-interactive', '{"namespace":"core/image"}' );
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$w->set_attribute(
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'data-wp-context',
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sprintf(
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'{ "imageLoaded": false,
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"initialized": false,
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"lightboxEnabled": false,
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"hideAnimationEnabled": false,
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"preloadInitialized": false,
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"lightboxAnimation": "%s",
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"imageUploadedSrc": "%s",
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"imageCurrentSrc": "",
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"targetWidth": "%s",
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"targetHeight": "%s",
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"scaleAttr": "%s",
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"dialogLabel": "%s"
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}',
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$lightbox_animation,
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$img_uploaded_src,
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$img_width,
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$img_height,
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$scale_attr,
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__( 'Enlarged image' )
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)
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);
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$w->next_tag( 'img' );
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$w->set_attribute( 'data-wp-init', 'callbacks.initOriginImage' );
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$w->set_attribute( 'data-wp-on--load', 'actions.handleLoad' );
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$w->set_attribute( 'data-wp-watch', 'callbacks.setButtonStyles' );
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// We need to set an event callback on the `img` specifically
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// because the `figure` element can also contain a caption, and
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// we don't want to trigger the lightbox when the caption is clicked.
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$w->set_attribute( 'data-wp-on--click', 'actions.showLightbox' );
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$w->set_attribute( 'data-wp-watch--setStylesOnResize', 'callbacks.setStylesOnResize' );
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$body_content = $w->get_updated_html();
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// Add a button alongside image in the body content.
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$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, $body_content );
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// We need both a responsive image and an enlarged image to animate
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// the zoom seamlessly on slow internet connections; the responsive
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// image is a copy of the one in the body, which animates immediately
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// as the lightbox is opened, while the enlarged one is a full-sized
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// version that will likely still be loading as the animation begins.
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$m = new WP_HTML_Tag_Processor( $block_content );
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$m->next_tag( 'figure' );
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$m->add_class( 'responsive-image' );
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$m->next_tag( 'img' );
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// We want to set the 'src' attribute to an empty string in the responsive image
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// because otherwise, as of this writing, the wp_filter_content_tags() function in
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// WordPress will automatically add a 'srcset' attribute to the image, which will at
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// times cause the incorrectly sized image to be loaded in the lightbox on Firefox.
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// Because of this, we bind the 'src' attribute explicitly the current src to reliably
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// use the exact same image as in the content when the lightbox is first opened while
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// we wait for the larger image to load.
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$m->set_attribute( 'src', '' );
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$m->set_attribute( 'data-wp-bind--src', 'context.imageCurrentSrc' );
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$m->set_attribute( 'data-wp-style--object-fit', 'state.lightboxObjectFit' );
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$initial_image_content = $m->get_updated_html();
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$q = new WP_HTML_Tag_Processor( $block_content );
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$q->next_tag( 'figure' );
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$q->add_class( 'enlarged-image' );
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$q->next_tag( 'img' );
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// We set the 'src' attribute to an empty string to prevent the browser from loading the image
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// on initial page load, then bind the attribute to a selector that returns the full-sized image src when
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// the lightbox is opened. We could use 'loading=lazy' in combination with the 'hidden' attribute to
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// accomplish the same behavior, but that approach breaks progressive loading of the image in Safari
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// and Chrome (see https://github.com/WordPress/gutenberg/pull/52765#issuecomment-1674008151). Until that
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// is resolved, manually setting the 'src' seems to be the best solution to load the large image on demand.
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$q->set_attribute( 'src', '' );
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$q->set_attribute( 'data-wp-bind--src', 'state.enlargedImgSrc' );
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$q->set_attribute( 'data-wp-style--object-fit', 'state.lightboxObjectFit' );
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$enlarged_image_content = $q->get_updated_html();
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// If the current theme does NOT have a `theme.json`, or the colors are not defined,
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// we need to set the background color & close button color to some default values
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// because we can't get them from the Global Styles.
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$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( $global_styles_color['text'] );
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}
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}
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$close_button_icon = '<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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$close_button_label = esc_attr__( 'Close' );
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$lightbox_html = <<<HTML
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<div data-wp-body="" class="wp-lightbox-overlay $lightbox_animation"
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data-wp-bind--role="state.roleAttribute"
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data-wp-bind--aria-label="state.dialogLabel"
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data-wp-class--initialized="context.initialized"
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data-wp-class--active="context.lightboxEnabled"
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data-wp-class--hideAnimationEnabled="context.hideAnimationEnabled"
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data-wp-bind--aria-modal="state.ariaModal"
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data-wp-watch="callbacks.initLightbox"
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data-wp-on--keydown="actions.handleKeydown"
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data-wp-on--touchstart="actions.handleTouchStart"
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data-wp-on--touchmove="actions.handleTouchMove"
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data-wp-on--touchend="actions.handleTouchEnd"
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data-wp-on--click="actions.hideLightbox"
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tabindex="-1"
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>
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<button type="button" aria-label="$close_button_label" style="fill: $close_button_color" class="close-button" data-wp-on--click="actions.hideLightbox">
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$close_button_icon
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</button>
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<div class="lightbox-image-container">$initial_image_content</div>
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<div class="lightbox-image-container">$enlarged_image_content</div>
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<div class="scrim" style="background-color: $background_color" aria-hidden="true"></div>
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</div>
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HTML;
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return str_replace( '</figure>', $lightbox_html . '</figure>', $body_content );
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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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wp_register_script_module(
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'@wordpress/block-library/image',
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defined( 'IS_GUTENBERG_PLUGIN' ) && IS_GUTENBERG_PLUGIN ? gutenberg_url( '/build/interactivity/image.min.js' ) : includes_url( 'blocks/image/view.min.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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}
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add_action( 'init', 'register_block_core_image' );
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