<?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.
*
* @since 5.9.0
*
* @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' ) || ! $p->get_attribute( 'src' ) ) {
return '';
}
$has_id_binding = isset( $attributes['metadata']['bindings']['id'] ) && isset( $attributes['id'] );
// Ensure the `wp-image-id` classname on the image block supports block bindings.
if ( $has_id_binding ) {
// If there's a mismatch with the 'wp-image-' class and the actual id, the id was
// probably overridden by block bindings. Update it to the correct value.
// See https://github.com/WordPress/gutenberg/issues/62886 for why this is needed.
$id = $attributes['id'];
$image_classnames = $p->get_attribute( 'class' );
$class_with_binding_value = "wp-image-$id";
if ( is_string( $image_classnames ) && ! str_contains( $image_classnames, $class_with_binding_value ) ) {
$image_classnames = preg_replace( '/wp-image-(\d+)/', $class_with_binding_value, $image_classnames );
$p->set_attribute( 'class', $image_classnames );
}
}
// For backwards compatibility, the data-id html attribute is only set for
// image blocks nested in a gallery. Detect if the image is in a gallery by
// checking the data-id attribute.
// See the `block_core_gallery_data_id_backcompatibility` function.
if ( isset( $attributes['data-id'] ) ) {
// If there's a binding for the `id`, the `id` attribute is used for the
// value, since `data-id` does not support block bindings.
// Else the `data-id` is used for backwards compatibility, since
// third parties may be filtering its value.
$data_id = $has_id_binding ? $attributes['id'] : $attributes['data-id'];
$p->set_attribute( 'data-id', $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']
) {
wp_enqueue_script_module( '@wordpress/block-library/image/view' );
/*
* 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.
*
* @since 6.4.0
*
* @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.
*
* @since 6.4.0
*
* @param string $block_content Rendered block content.
* @param array $block Block object.
*
* @return string Filtered block content.
*/
function block_core_image_render_lightbox( $block_content, $block ) {
/*
* If there's no IMG tag in the block then return the given block content
* as-is. There's nothing that this code can knowingly modify to add the
* lightbox behavior.
*/
$p = new WP_HTML_Tag_Processor( $block_content );
if ( $p->next_tag( 'figure' ) ) {
$p->set_bookmark( 'figure' );
}
if ( ! $p->next_tag( 'img' ) ) {
return $block_content;
}
$alt = $p->get_attribute( 'alt' );
$img_uploaded_src = $p->get_attribute( 'src' );
$img_class_names = $p->get_attribute( 'class' );
$img_styles = $p->get_attribute( 'style' );
$img_width = 'none';
$img_height = 'none';
$aria_label = __( 'Enlarge' );
$dialog_aria_label = __( 'Enlarged image' );
if ( isset( $block['attrs']['id'] ) ) {
$img_uploaded_src = wp_get_attachment_url( $block['attrs']['id'] );
$img_metadata = wp_get_attachment_metadata( $block['attrs']['id'] );
$img_width = $img_metadata['width'] ?? 'none';
$img_height = $img_metadata['height'] ?? 'none';
}
// Figure.
$p->seek( 'figure' );
$figure_class_names = $p->get_attribute( 'class' );
$figure_styles = $p->get_attribute( 'style' );
// Create unique id and set the image metadata in the state.
$unique_image_id = uniqid();
wp_interactivity_state(
'core/image',
array(
'metadata' => array(
$unique_image_id => array(
'uploadedSrc' => $img_uploaded_src,
'figureClassNames' => $figure_class_names,
'figureStyles' => $figure_styles,
'imgClassNames' => $img_class_names,
'imgStyles' => $img_styles,
'targetWidth' => $img_width,
'targetHeight' => $img_height,
'scaleAttr' => $block['attrs']['scale'] ?? false,
'ariaLabel' => $dialog_aria_label,
'alt' => $alt,
),
),
)
);
$p->add_class( 'wp-lightbox-container' );
$p->set_attribute( 'data-wp-interactive', 'core/image' );
$p->set_attribute(
'data-wp-context',
wp_json_encode(
array(
'imageId' => $unique_image_id,
),
JSON_HEX_TAG | JSON_HEX_APOS | JSON_HEX_QUOT | JSON_HEX_AMP
)
);
// Image.
$p->next_tag( 'img' );
$p->set_attribute( 'data-wp-init', 'callbacks.setButtonStyles' );
$p->set_attribute( 'data-wp-on-async--load', 'callbacks.setButtonStyles' );
$p->set_attribute( 'data-wp-on-async-window--resize', 'callbacks.setButtonStyles' );
// Sets an event callback on the `img` because the `figure` element can also
// contain a caption, and we don't want to trigger the lightbox when the
// caption is clicked.
$p->set_attribute( 'data-wp-on-async--click', 'actions.showLightbox' );
$p->set_attribute( 'data-wp-class--hide', 'state.isContentHidden' );
$p->set_attribute( 'data-wp-class--show', 'state.isContentVisible' );
$body_content = $p->get_updated_html();
// Adds a button alongside image in the body content.
$img = null;
preg_match( '/<img[^>]+>/', $body_content, $img );
$button =
$img[0]
. '<button
class="lightbox-trigger"
type="button"
aria-haspopup="dialog"
aria-label="' . esc_attr( $aria_label ) . '"
data-wp-init="callbacks.initTriggerButton"
data-wp-on-async--click="actions.showLightbox"
data-wp-style--right="state.imageButtonRight"
data-wp-style--top="state.imageButtonTop"
>
<svg xmlns="http://www.w3.org/2000/svg" width="12" height="12" fill="none" viewBox="0 0 12 12">
<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" />
</svg>
</button>';
$body_content = preg_replace( '/<img[^>]+>/', $button, $body_content );
add_action( 'wp_footer', 'block_core_image_print_lightbox_overlay' );
return $body_content;
}
/**
* @since 6.5.0
*/
function block_core_image_print_lightbox_overlay() {
$close_button_label = esc_attr__( 'Close' );
// If the current theme does NOT have a `theme.json`, or the colors are not
// defined, it needs to set the background color & close button color to some
// default values because it can't get them from the Global Styles.
$background_color = '#fff';
$close_button_color = '#000';
if ( wp_theme_has_theme_json() ) {
$global_styles_color = wp_get_global_styles( array( 'color' ) );
if ( ! empty( $global_styles_color['background'] ) ) {
$background_color = esc_attr( $global_styles_color['background'] );
}
if ( ! empty( $global_styles_color['text'] ) ) {
$close_button_color = esc_attr( $global_styles_color['text'] );
}
}
echo <<<HTML
<div
class="wp-lightbox-overlay zoom"
data-wp-interactive="core/image"
data-wp-context='{}'
data-wp-bind--role="state.roleAttribute"
data-wp-bind--aria-label="state.currentImage.ariaLabel"
data-wp-bind--aria-modal="state.ariaModal"
data-wp-class--active="state.overlayEnabled"
data-wp-class--show-closing-animation="state.showClosingAnimation"
data-wp-watch="callbacks.setOverlayFocus"
data-wp-on--keydown="actions.handleKeydown"
data-wp-on-async--touchstart="actions.handleTouchStart"
data-wp-on--touchmove="actions.handleTouchMove"
data-wp-on-async--touchend="actions.handleTouchEnd"
data-wp-on-async--click="actions.hideLightbox"
data-wp-on-async-window--resize="callbacks.setOverlayStyles"
data-wp-on-async-window--scroll="actions.handleScroll"
data-wp-bind--style="state.overlayStyles"
tabindex="-1"
>
<button type="button" aria-label="$close_button_label" style="fill: $close_button_color" class="close-button">
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" width="20" height="20" aria-hidden="true" focusable="false"><path d="m13.06 12 6.47-6.47-1.06-1.06L12 10.94 5.53 4.47 4.47 5.53 10.94 12l-6.47 6.47 1.06 1.06L12 13.06l6.47 6.47 1.06-1.06L13.06 12Z"></path></svg>
</button>
<div class="lightbox-image-container">
<figure data-wp-bind--class="state.currentImage.figureClassNames" data-wp-bind--style="state.figureStyles">
<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">
</figure>
</div>
<div class="lightbox-image-container">
<figure data-wp-bind--class="state.currentImage.figureClassNames" data-wp-bind--style="state.figureStyles">
<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">
</figure>
</div>
<div class="scrim" style="background-color: $background_color" aria-hidden="true"></div>
</div>
HTML;
}
/**
* Registers the `core/image` block on server.
*
* @since 5.9.0
*/
function register_block_core_image() {
register_block_type_from_metadata(
__DIR__ . '/image',
array(
'render_callback' => 'render_block_core_image',
)
);
}
add_action( 'init', 'register_block_core_image' );
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