Permite mostrar contenido personalizado en la parte superior de la ficha de producto

add-custom-content-before-main-content-of-product.php

// Permite mostrar contenido personalizado en la parte superior de la ficha de producto
if ( in_array( 'woocommerce/woocommerce.php', get_option( 'active_plugins' ) ) ){

	// Muestra el contenido si lo hay
	add_action( 'woocommerce_before_single_product_summary', 'add_custom_content_before_main_content_of_product', 5 );
	function add_custom_content_before_main_content_of_product(){
		global $post;

		$top_content = get_post_meta( $post->ID, 'top_content', true );
		if ( !empty( $top_content ) ) {
			?>
			<div style="margin-bottom: 50px;"><?php echo $top_content; ?></div>
			<?php
		}
	}

	// Crea un nuevo metabox en la página de edición del producto para editar el contenido a mostrar
	add_action( 'add_meta_boxes', 'woo_update_notification_metabox' );
	function woo_update_notification_metabox(){
		add_meta_box( 'woo-top-content-box', 'Información adicional destacada antes del producto', 'render_woo_top_content_metabox', 'product', 'normal', 'default' );
	}
	
	// Carga el metabox
	function render_woo_top_content_metabox( $post ){
	    	$settings = array(
			'textarea_name' => 'top_content',
			'textarea_rows' => 10,
			'quicktags'     => array( 'buttons' => 'em,strong,link' ),
			'tinymce'       => array(
				'theme_advanced_buttons1' => 'bold,italic,strikethrough,separator,bullist,numlist,separator,blockquote,separator,justifyleft,justifycenter,justifyright,separator,link,unlink,separator,undo,redo,separator',
				'theme_advanced_buttons2' => '',
			),
			'editor_css'    => '<style>#wp-excerpt-editor-container .wp-editor-area{height:175px; width:100%;}</style>'
		);
	
	    	$top_content = get_post_meta( $post->ID, 'top_content', true );
		wp_editor( htmlspecialchars_decode( $top_content ), 'top_content', $settings );
	
		wp_nonce_field( 'woo-top-content-box-nonce', 'top_content_nonce' );
	}
	
	// Guarda el nuevo contenido en la ficha de producto
	add_action( 'save_post', 'woo_top_content_metabox_save' );
	function woo_top_content_metabox_save( $post_id ){
	
		// Bail if we're doing an auto save  
	    	if( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) return;
	 	
	    	// if our nonce isn't there, or we can't verify it, bail 
	    	if( !isset( $_POST[ 'top_content_nonce' ] ) || !wp_verify_nonce( $_POST[ 'top_content_nonce' ], 'woo-top-content-box-nonce' ) ) return;
	 	
	    	// if our current user can't edit this post, bail  
	    	if( 'product' == $_POST['post_type'] ) {

	    		if( !current_user_can('edit_page', $post_id) ) {

	    			return $post_id;
	      		} else {
					
				$top_content = isset( $_POST[ 'top_content' ] )? $_POST[ 'top_content' ] : '';
				update_post_meta( $post_id, 'top_content', $top_content );
	      		}
	    	}
	}

	// Mueve la etiqueta de oferta dentro del wrapper de la imagen de producto
	remove_action( 'woocommerce_before_single_product_summary', 'woocommerce_show_product_sale_flash', 10 );
	add_action( 'woocommerce_product_thumbnails', 'woocommerce_show_product_sale_flash' );
}