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behaviors.php
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<?php
/**
* Behaviors block support flag.
*
* @package gutenberg
*/
/**
* Registers the behaviors block attribute for block types that support it.
* And add the needed hooks to add those behaviors.
*
* @param WP_Block_Type $block_type Block Type.
*/
function gutenberg_register_behaviors_support( $block_type ) {
$has_behaviors_support = block_has_support( $block_type, array( 'behaviors' ), false );
if ( ! $has_behaviors_support ) {
return;
}
if ( ! $block_type->attributes ) {
$block_type->attributes = array();
}
$block_type->attributes['behaviors'] = array(
'type' => 'object',
);
// If it supports the lightbox behavior, add the hook to that block.
// In the future, this should be a loop with all the behaviors.
$has_lightbox_support = block_has_support( $block_type, array( 'behaviors', 'lightbox' ), false );
if ( $has_lightbox_support ) {
// Use priority 15 to run this hook after other hooks/plugins.
// They could use the `render_block_{$this->name}` filter to modify the markup.
add_filter( 'render_block_' . $block_type->name, 'gutenberg_render_behaviors_support_lightbox', 15, 2 );
}
}
/**
* Add the directives and layout needed for the lightbox behavior.
* This functions shouldn't be in this file. It should be moved to a package (or somewhere else), where all the behaviors logic is defined.
*
* @param string $block_content Rendered block content.
* @param array $block Block object.
* @return string Filtered block content.
*/
function gutenberg_render_behaviors_support_lightbox( $block_content, $block ) {
$experiments = get_option( 'gutenberg-experiments' );
$link_destination = isset( $block['attrs']['linkDestination'] ) ? $block['attrs']['linkDestination'] : 'none';
// Get the lightbox setting from the block attributes.
if ( isset( $block['attrs']['behaviors']['lightbox'] ) ) {
$lightbox_settings = $block['attrs']['behaviors']['lightbox'];
// If the lightbox setting is not set in the block attributes, get it from the theme.json file.
} else {
$theme_data = WP_Theme_JSON_Resolver_Gutenberg::get_merged_data()->get_data();
if ( isset( $theme_data['behaviors']['blocks'][ $block['blockName'] ]['lightbox'] ) ) {
$lightbox_settings = $theme_data['behaviors']['blocks'][ $block['blockName'] ]['lightbox'];
} else {
$lightbox_settings = null;
}
}
if ( isset( $lightbox_settings['enabled'] ) && false === $lightbox_settings['enabled'] ) {
return $block_content;
}
if ( ! $lightbox_settings || 'none' !== $link_destination || empty( $experiments['gutenberg-interactivity-api-core-blocks'] ) ) {
return $block_content;
}
$processor = new WP_HTML_Tag_Processor( $block_content );
$aria_label = __( 'Enlarge image', 'gutenberg' );
$alt_attribute = trim( $processor->get_attribute( 'alt' ) );
if ( $alt_attribute ) {
/* translators: %s: Image alt text. */
$aria_label = sprintf( __( 'Enlarge image: %s', 'gutenberg' ), $alt_attribute );
}
$content = $processor->get_updated_html();
// If we don't set a default, it won't work if Lightbox is set to enabled by default.
$lightbox_animation = 'zoom';
if ( isset( $lightbox_settings['animation'] ) && '' !== $lightbox_settings['animation'] ) {
$lightbox_animation = $lightbox_settings['animation'];
}
// We want to store the src in the context so we can set it dynamically when the lightbox is opened.
$z = new WP_HTML_Tag_Processor( $content );
$z->next_tag( 'img' );
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'];
$img_height = $img_metadata['height'];
$img_uploaded_srcset = wp_get_attachment_image_srcset( $block['attrs']['id'] );
} else {
$img_uploaded_src = $z->get_attribute( 'src' );
$img_width = 'none';
$img_height = 'none';
$img_uploaded_srcset = '';
}
$w = new WP_HTML_Tag_Processor( $content );
$w->next_tag( 'figure' );
$w->add_class( 'wp-lightbox-container' );
$w->set_attribute( 'data-wp-interactive', true );
$w->set_attribute(
'data-wp-context',
sprintf(
'{ "core":
{ "image":
{ "imageLoaded": false,
"initialized": false,
"lightboxEnabled": false,
"hideAnimationEnabled": false,
"preloadInitialized": false,
"lightboxAnimation": "%s",
"imageUploadedSrc": "%s",
"imageCurrentSrc": "",
"imageSrcSet": "%s",
"targetWidth": "%s",
"targetHeight": "%s"
}
}
}',
$lightbox_animation,
$img_uploaded_src,
$img_uploaded_srcset,
$img_width,
$img_height
)
);
$w->next_tag( 'img' );
$w->set_attribute( 'data-wp-effect', 'effects.core.image.setCurrentSrc' );
$body_content = $w->get_updated_html();
// Wrap the image in the body content with a button.
$img = null;
preg_match( '/<img[^>]+>/', $body_content, $img );
$button = '<div class="img-container">
<button type="button" aria-haspopup="dialog" aria-label="' . esc_attr( $aria_label ) . '" data-wp-on--click="actions.core.image.showLightbox" data-wp-on--mouseenter="actions.core.image.preloadLightboxImage"></button>'
. $img[0] .
'</div>';
$body_content = preg_replace( '/<img[^>]+>/', $button, $body_content );
// Add src to the modal image.
$m = new WP_HTML_Tag_Processor( $content );
$m->next_tag( 'figure' );
$m->add_class( 'responsive-image' );
$m->next_tag( 'img' );
$m->set_attribute( 'src', '' );
$m->set_attribute( 'data-wp-bind--src', 'selectors.core.image.responsiveImgSrc' );
$initial_image_content = $m->get_updated_html();
$q = new WP_HTML_Tag_Processor( $content );
$q->next_tag( 'figure' );
$q->add_class( 'enlarged-image' );
$q->next_tag( 'img' );
$q->set_attribute( 'src', '' );
$q->set_attribute( 'data-wp-bind--src', 'selectors.core.image.enlargedImgSrc' );
$enlarged_image_content = $q->get_updated_html();
$background_color = esc_attr( wp_get_global_styles( array( 'color', 'background' ) ) );
$close_button_icon = '<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" width="15" height="15" 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>';
$close_button_color = esc_attr( wp_get_global_styles( array( 'color', 'text' ) ) );
$dialog_label = $alt_attribute ? esc_attr( $alt_attribute ) : esc_attr__( 'Image', 'gutenberg' );
$close_button_label = esc_attr__( 'Close', 'gutenberg' );
$lightbox_html = <<<HTML
<div data-wp-body="" class="wp-lightbox-overlay $lightbox_animation"
data-wp-bind--role="selectors.core.image.roleAttribute"
aria-label="$dialog_label"
data-wp-class--initialized="context.core.image.initialized"
data-wp-class--active="context.core.image.lightboxEnabled"
data-wp-class--hideAnimationEnabled="context.core.image.hideAnimationEnabled"
data-wp-bind--aria-hidden="!context.core.image.lightboxEnabled"
data-wp-bind--aria-modal="context.core.image.lightboxEnabled"
data-wp-effect="effects.core.image.initLightbox"
data-wp-on--keydown="actions.core.image.handleKeydown"
data-wp-on--mousewheel="actions.core.image.hideLightbox"
data-wp-on--click="actions.core.image.hideLightbox"
>
<button type="button" aria-label="$close_button_label" style="fill: $close_button_color" class="close-button" data-wp-on--click="actions.core.image.hideLightbox">
$close_button_icon
</button>
$initial_image_content
$enlarged_image_content
<div class="scrim" style="background-color: $background_color"></div>
</div>
HTML;
return str_replace( '</figure>', $lightbox_html . '</figure>', $body_content );
}
// Register the block support.
WP_Block_Supports::get_instance()->register(
'behaviors',
array(
'register_attribute' => 'gutenberg_register_behaviors_support',
)
);