woocommerce/widgets/widget-onsale.php

<?php
/**
 * On Sale Widget
 * 
 * @package		WooCommerce
 * @category	Widgets
 * @author		WooThemes
 */

class WooCommerce_Widget_On_Sale extends WP_Widget {

	/** Variables to setup the widget. */
	var $woo_widget_cssclass;
	var $woo_widget_description;
	var $woo_widget_idbase;
	var $woo_widget_name;
	
	/** constructor */
	function WooCommerce_Widget_On_Sale() {
		
		/* Widget variable settings. */
		$this->woo_widget_cssclass = 'widget_onsale';
		$this->woo_widget_description = __( 'Display a list of your on-sale products on your site.', 'woocommerce' );
		$this->woo_widget_idbase = 'woocommerce_onsale';
		$this->woo_widget_name = __('WooCommerce On-sale', 'woocommerce' );
		
		/* Widget settings. */
		$widget_ops = array( 'classname' => $this->woo_widget_cssclass, 'description' => $this->woo_widget_description );
		
		/* Create the widget. */
		$this->WP_Widget('onsale', $this->woo_widget_name, $widget_ops);

		add_action( 'save_post', array(&$this, 'flush_widget_cache') );
		add_action( 'deleted_post', array(&$this, 'flush_widget_cache') );
		add_action( 'switch_theme', array(&$this, 'flush_widget_cache') );
	}

	/** @see WP_Widget */
	function widget($args, $instance) {
		global $wp_query, $woocommerce;
		
		$cache = wp_cache_get('widget_onsale', 'widget');

		if ( !is_array($cache) ) $cache = array();

		if ( isset($cache[$args['widget_id']]) ) {
			echo $cache[$args['widget_id']];
			return;
		}

		ob_start();
		extract($args);
		
		$title = apply_filters('widget_title', empty($instance['title']) ? __('On Sale', 'woocommerce') : $instance['title'], $instance, $this->id_base);
		if ( !$number = (int) $instance['number'] )
			$number = 10;
		else if ( $number < 1 )
			$number = 1;
		else if ( $number > 15 )
			$number = 15;

		// Get products on sale
		if ( false === ( $product_ids_on_sale = get_transient( 'woocommerce_products_onsale' ) ) ) :
		
			$meta_query = array();
		    $meta_query[] = array(
		    	'key' => '_sale_price',
		        'value' 	=> 0,
				'compare' 	=> '>',
				'type'		=> 'NUMERIC'
		    );
	
			$on_sale = get_posts(array(
				'post_type' 		=> array('product', 'product_variation'),
				'posts_per_page' 	=> -1,
				'post_status' 		=> 'publish',
				'meta_query' 		=> $meta_query,
				'fields' 			=> 'id=>parent'
			));
			
			$product_ids_on_sale = array_unique(array_merge(array_values($on_sale), array_keys($on_sale)));
			
			set_transient( 'woocommerce_products_onsale', $product_ids_on_sale );
					
		endif;
		
		$product_ids_on_sale[] = 0;
		
		$meta_query = array();
		$meta_query[] = $woocommerce->query->visibility_meta_query();
	    $meta_query[] = $woocommerce->query->stock_status_meta_query();
		    
    	$query_args = array(
    		'posts_per_page' 	=> $number, 
    		'nopaging' 		=> 0, 
    		'post_status' 	=> 'publish', 
    		'post_type' 	=> 'product',
    		'orderby' 		=> 'rand',
    		'meta_query' 	=> $meta_query,
    		'post__in'		=> $product_ids_on_sale
    	);

		$r = new WP_Query($query_args);
		
		if ($r->have_posts()) :
?>
		<?php echo $before_widget; ?>
		<?php if ( $title ) echo $before_title . $title . $after_title; ?>
		<ul class="product_list_widget">
		<?php  while ($r->have_posts()) : $r->the_post(); global $product; ?>
		<li><a href="<?php the_permalink() ?>" title="<?php echo esc_attr(get_the_title() ? get_the_title() : get_the_ID()); ?>">
			<?php if (has_post_thumbnail()) the_post_thumbnail('shop_thumbnail'); else echo '<img src="'.$woocommerce->plugin_url().'/assets/images/placeholder.png" alt="Placeholder" width="'.$woocommerce->get_image_size('shop_thumbnail_image_width').'" height="'.$woocommerce->get_image_size('shop_thumbnail_image_height').'" />'; ?>
			<?php if ( get_the_title() ) the_title(); else the_ID(); ?>
		</a> <?php echo $product->get_price_html(); ?></li>
		<?php endwhile; ?>
		</ul>
		<?php echo $after_widget; ?>
<?php
		endif;

		if (isset($args['widget_id']) && isset($cache[$args['widget_id']])) $cache[$args['widget_id']] = ob_get_flush();
		wp_cache_set('widget_onsale', $cache, 'widget');
	}

	/** @see WP_Widget->update */
	function update( $new_instance, $old_instance ) {
		$instance = $old_instance;
		$instance['title'] = strip_tags($new_instance['title']);
		$instance['number'] = (int) $new_instance['number'];		

		$this->flush_widget_cache();

		$alloptions = wp_cache_get( 'alloptions', 'options' );
		if ( isset($alloptions['widget_onsale']) ) delete_option('widget_onsale');

		return $instance;
	}

	function flush_widget_cache() {
		wp_cache_delete('widget_onsale', 'widget');
	}

	/** @see WP_Widget->form */
	function form( $instance ) {
		$title = isset($instance['title']) ? esc_attr($instance['title']) : '';
		if ( !isset($instance['number']) || !$number = (int) $instance['number'] ) $number = 5;

		?>
		<p><label for="<?php echo $this->get_field_id('title'); ?>"><?php _e('Title:', 'woocommerce'); ?></label>
		<input class="widefat" id="<?php echo esc_attr( $this->get_field_id('title') ); ?>" name="<?php echo esc_attr( $this->get_field_name('title') ); ?>" type="text" value="<?php echo esc_attr( $title ); ?>" /></p>

		<p><label for="<?php echo $this->get_field_id('number'); ?>"><?php _e('Number of products to show:', 'woocommerce'); ?></label>
		<input id="<?php echo esc_attr( $this->get_field_id('number') ); ?>" name="<?php echo esc_attr( $this->get_field_name('number') ); ?>" type="text" value="<?php echo esc_attr( $number ); ?>" size="3" /></p>

		<?php
	}
}