woocommerce/includes/widgets/class-wc-widget-recently-viewed.php

<?php
/**
 * Recent Products Widget
 *
 * @author 		WooThemes
 * @category 	Widgets
 * @package 	WooCommerce/Widgets
 * @version 	2.1.0
 * @extends 	WC_Widget
 */

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

class WC_Widget_Recently_Viewed extends WC_Widget {

	/**
	 * Constructor
	 */
	public function __construct() {
		$this->widget_cssclass    = 'woocommerce widget_recently_viewed_products';
		$this->widget_description = __( 'Display a list of recently viewed products.', 'woocommerce' );
		$this->widget_id          = 'woocommerce_recently_viewed_products';
		$this->widget_name        = __( 'WooCommerce Recently Viewed', 'woocommerce' );
		$this->settings           = array(
			'title'  => array(
				'type'  => 'text',
				'std'   => __( 'Recently Viewed Products', 'woocommerce' ),
				'label' => __( 'Title', 'woocommerce' )
			),
			'number' => array(
				'type'  => 'number',
				'step'  => 1,
				'min'   => 1,
				'max'   => '',
				'std'   => 10,
				'label' => __( 'Number of products to show', 'woocommerce' )
			)
		);
		parent::__construct();
	}

	/**
	 * widget function.
	 *
	 * @see WP_Widget
	 * @access public
	 * @param array $args
	 * @param array $instance
	 * @return void
	 */
	function widget($args, $instance) {
		global $woocommerce;

		$viewed_products = ! empty( $_COOKIE['woocommerce_recently_viewed'] ) ? (array) explode( '|', $_COOKIE['woocommerce_recently_viewed'] ) : array();
		$viewed_products = array_filter( array_map( 'absint', $viewed_products ) );

		if ( empty( $viewed_products ) )
			return;

		ob_start();
		extract( $args );

		$title  = apply_filters( 'widget_title', $instance['title'], $instance, $this->id_base );
		$number = absint( $instance['number'] );

	    $query_args = array( 'posts_per_page' => $number, 'no_found_rows' => 1, 'post_status' => 'publish', 'post_type' => 'product', 'post__in' => $viewed_products, 'orderby' => 'rand' );

		$query_args['meta_query'] = array();
	    $query_args['meta_query'][] = $woocommerce->query->stock_status_meta_query();
	    $query_args['meta_query'] = array_filter( $query_args['meta_query'] );

		$r = new WP_Query($query_args);

		if ( $r->have_posts() ) {

			echo $before_widget;

			if ( $title )
				echo $before_title . $title . $after_title;

			echo '<ul class="product_list_widget">';

			while ( $r->have_posts()) {
				$r->the_post();
				woocommerce_get_template( 'content-widget-product.php' );
			}

			echo '</ul>';

			echo $after_widget;
		}

		wp_reset_postdata();

		$content = ob_get_clean();

		echo $content;
	}
}

register_widget( 'WC_Widget_Recently_Viewed' );