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✏️ Editing: meta-box.php Writable

<?php
/**
 * Builds our main Layout meta box.
 *
 * @package GeneratePress
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit; // Exit if accessed directly.
}

add_action( 'admin_enqueue_scripts', 'generate_enqueue_meta_box_scripts' );
/**
 * Adds any scripts for this meta box.
 *
 * @since 2.0
 *
 * @param string $hook The current admin page.
 */
function generate_enqueue_meta_box_scripts( $hook ) {
	if ( in_array( $hook, array( 'post.php', 'post-new.php' ) ) ) {
		$post_types = get_post_types( array( 'public' => true ) );
		$screen = get_current_screen();
		$post_type = $screen->id;

if ( in_array( $post_type, (array) $post_types ) ) {
			wp_enqueue_style( 'generate-layout-metabox', get_template_directory_uri() . '/assets/css/admin/meta-box.css', array(), GENERATE_VERSION );
		}
	}
}

add_action( 'add_meta_boxes', 'generate_register_layout_meta_box' );
/**
 * Generate the layout metabox
 *
 * @since 2.0
 */
function generate_register_layout_meta_box() {
	if ( ! current_user_can( apply_filters( 'generate_metabox_capability', 'edit_theme_options' ) ) ) {
		return;
	}

if ( ! defined( 'GENERATE_LAYOUT_META_BOX' ) ) {
		define( 'GENERATE_LAYOUT_META_BOX', true );
	}

global $post;

$blog_id = get_option( 'page_for_posts' );

// No need for the Layout metabox on the blog page.
	if ( isset( $post->ID ) && $blog_id && (int) $blog_id === (int) $post->ID ) {
		return;
	}

$post_types = get_post_types( array( 'public' => true ) );

foreach ( $post_types as $type ) {
		if ( 'attachment' !== $type ) {
			add_meta_box(
				'generate_layout_options_meta_box',
				esc_html__( 'Layout', 'generatepress' ),
				'generate_do_layout_meta_box',
				$type,
				'side'
			);
		}
	}
}

/**
 * Build our meta box.
 *
 * @since 2.0
 *
 * @param object $post All post information.
 */
function generate_do_layout_meta_box( $post ) {
	wp_nonce_field( basename( __FILE__ ), 'generate_layout_nonce' );
	$stored_meta = (array) get_post_meta( $post->ID );
	$stored_meta['_generate-sidebar-layout-meta'][0] = ( isset( $stored_meta['_generate-sidebar-layout-meta'][0] ) ) ? $stored_meta['_generate-sidebar-layout-meta'][0] : '';
	$stored_meta['_generate-footer-widget-meta'][0] = ( isset( $stored_meta['_generate-footer-widget-meta'][0] ) ) ? $stored_meta['_generate-footer-widget-meta'][0] : '';
	$stored_meta['_generate-full-width-content'][0] = ( isset( $stored_meta['_generate-full-width-content'][0] ) ) ? $stored_meta['_generate-full-width-content'][0] : '';
	$stored_meta['_generate-disable-headline'][0] = ( isset( $stored_meta['_generate-disable-headline'][0] ) ) ? $stored_meta['_generate-disable-headline'][0] : '';

$tabs = apply_filters(
		'generate_metabox_tabs',
		array(
			'sidebars' => array(
				'title' => esc_html__( 'Sidebars', 'generatepress' ),
				'target' => '#generate-layout-sidebars',
				'class' => 'current',
			),
			'footer_widgets' => array(
				'title' => esc_html__( 'Footer Widgets', 'generatepress' ),
				'target' => '#generate-layout-footer-widgets',
				'class' => '',
			),
			'disable_elements' => array(
				'title' => esc_html__( 'Disable Elements', 'generatepress' ),
				'target' => '#generate-layout-disable-elements',
				'class' => '',
			),
			'container' => array(
				'title' => esc_html__( 'Content Container', 'generatepress' ),
				'target' => '#generate-layout-page-builder-container',
				'class' => '',
			),
		)
	);
	?>
	<script>
		jQuery(document).ready(function($) {
			$( '.generate-meta-box-menu li a' ).on( 'click', function( event ) {
				event.preventDefault();
				$( this ).parent().addClass( 'current' );
				$( this ).parent().siblings().removeClass( 'current' );
				var tab = $( this ).attr( 'data-target' );

// Page header module still using href.
				if ( ! tab ) {
					tab = $( this ).attr( 'href' );
				}

$( '.generate-meta-box-content' ).children( 'div' ).not( tab ).css( 'display', 'none' );
				$( tab ).fadeIn( 100 );
			});
		});
	</script>
	<div id="generate-meta-box-container">
		<ul class="generate-meta-box-menu">
			<?php
			foreach ( (array) $tabs as $tab => $data ) {
				echo '<li class="' . esc_attr( $data['class'] ) . '"><a data-target="' . esc_attr( $data['target'] ) . '" href="#">' . esc_html( $data['title'] ) . '</a></li>';
			}

do_action( 'generate_layout_meta_box_menu_item' );
			?>
		</ul>
		<div class="generate-meta-box-content">
			<div id="generate-layout-sidebars">
				<div class="generate_layouts">
					<label for="generate-sidebar-layout" class="generate-layout-metabox-section-title"><?php esc_html_e( 'Sidebar Layout', 'generatepress' ); ?></label>

<?php if ( ! defined( 'GP_PREMIUM_VERSION' ) ) : ?>
							<span style="display:block;padding-top:1em;border-top:1px solid #EFEFEF;">
								<a href="<?php echo generate_get_premium_url( 'https://generatepress.com/downloads/generate-disable-elements' ); // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped -- Escaped in function. ?>" target="_blank"><?php esc_html_e( 'Premium module available', 'generatepress' ); ?></a>
							</span>
						<?php endif; ?>
					</div>
				<?php endif; ?>

<?php do_action( 'generate_layout_disable_elements_section', $stored_meta ); ?>
			</div>
			<?php do_action( 'generate_layout_meta_box_content', $stored_meta ); ?>
		</div>
	</div>
	<?php
}

add_action( 'save_post', 'generate_save_layout_meta_data' );
/**
 * Saves the sidebar layout meta data.
 *
 * @since 2.0
 * @param int $post_id Post ID.
 */
function generate_save_layout_meta_data( $post_id ) {
	$is_autosave = wp_is_post_autosave( $post_id );
	$is_revision = wp_is_post_revision( $post_id );
	$is_valid_nonce = ( isset( $_POST['generate_layout_nonce'] ) && wp_verify_nonce( sanitize_key( $_POST['generate_layout_nonce'] ), basename( __FILE__ ) ) ) ? true : false;

if ( $is_autosave || $is_revision || ! $is_valid_nonce ) {
		return;
	}

if ( ! current_user_can( 'edit_post', $post_id ) ) {
		return $post_id;
	}

$sidebar_layout_key   = '_generate-sidebar-layout-meta';
	$sidebar_layout_value = isset( $_POST[ $sidebar_layout_key ] )
		? sanitize_text_field( wp_unslash( $_POST[ $sidebar_layout_key ] ) )
		: '';

if ( $sidebar_layout_value ) {
		update_post_meta( $post_id, $sidebar_layout_key, $sidebar_layout_value );
	} else {
		delete_post_meta( $post_id, $sidebar_layout_key );
	}

$footer_widget_key   = '_generate-footer-widget-meta';
	$footer_widget_value = isset( $_POST[ $footer_widget_key ] )
		? sanitize_text_field( wp_unslash( $_POST[ $footer_widget_key ] ) )
		: '';

// Check for empty string to allow 0 as a value.
	if ( '' !== $footer_widget_value ) {
		update_post_meta( $post_id, $footer_widget_key, $footer_widget_value );
	} else {
		delete_post_meta( $post_id, $footer_widget_key );
	}

$page_builder_container_key   = '_generate-full-width-content';
	$page_builder_container_value = isset( $_POST[ $page_builder_container_key ] )
		? sanitize_text_field( wp_unslash( $_POST[ $page_builder_container_key ] ) )
		: '';

if ( $page_builder_container_value ) {
		update_post_meta( $post_id, $page_builder_container_key, $page_builder_container_value );
	} else {
		delete_post_meta( $post_id, $page_builder_container_key );
	}

// We only need this if the Disable Elements module doesn't exist.
	if ( ! defined( 'GENERATE_DE_VERSION' ) ) {
		$disable_content_title_key   = '_generate-disable-headline';
		$disable_content_title_value = isset( $_POST[ $disable_content_title_key ] )
			? sanitize_text_field( wp_unslash( $_POST[ $disable_content_title_key ] ) )
			: '';

if ( $disable_content_title_value ) {
			update_post_meta( $post_id, $disable_content_title_key, $disable_content_title_value );
		} else {
			delete_post_meta( $post_id, $disable_content_title_key );
		}
	}

do_action( 'generate_layout_meta_box_save', $post_id );
}