Sort Posts Widget

<?php 
if ( ! defined( 'ABSPATH' ) ) exit; // Exit if accessed directly.
/**
 * Sort Recent Posts Widget.
 *
 * @since      PostVision 0.1.0
 * @package    PostVision
 * @subpackage Sort Recent Posts Widget / PostVision Widgets 
 * @author     Ahmed Bouhuolia <a.bouhuolia@gmail.com>
 * @copyright  Copyright (c) 2015, Customattic.
 * @link       http://groundwork.customattic.io
 */

class Customatic_Widget_Sort_Recent_Posts extends WP_Widget{

	/**
     * Unique identifier for the widgets.
     * @since    PostVision 0.1.0
     * @var      string
     */
    protected $widget_slug = 'widget-cu-sort-recent-posts';

    /**
	 * Specifies the classname and description, instantiates the widget,
	 * loads localization files.
	 * 
	 * @since  PostVision 0.1.0
	 * @return void 
	 */
	public function __construct() {
		parent::__construct(
			$this->get_widget_slug(),
			_x('Customatic - Sort Recent Posts', 'widget_sort_posts', 'PostVision'),
			array(
				'classname'   => $this->widget_slug,
				'description' => __('Short description of the widget goes here.', 'PostVision')
			)
		);

		// Refreshing the widget's cached output with each new post
		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' ) );
	} // End constructor

	/**
     * Return the widget slug.
     *
     * @return    Plugin slug variable.
     */
    public function get_widget_slug() {
        return $this->widget_slug;
    }

	public function flush_widget_cache() {
    	wp_cache_delete( $this->get_widget_slug(), 'widget' );
	}

	/**
	 * Retrieve the most recent posts with spacific count of posts.
	 *
	 * @since  PostVision 0.1.0
	 * @param  int    $num_posts    Number of posts allowed to display
	 * @param  bool   $show_thumb   Allows to display thumbnail of post or no.
	 * @access public 
	 * @return void 
	 */
	function widget( $args, $instance ) {
		extract( $args );

		// Our variables from the widget settings.
		$title        = apply_filters('widget_title', $instance['title'] );

		$sort_by      = isset( $instance['sort_by'] )     ? $instance['sort_by'] 				: false;
		$number_posts = isset( $instance['number_posts']) ? intval($instance['number_posts']) 	: false;
		$categories   = isset( $instance['categories'] )  ? $instance['categories'] 			: false;
		$tags         = isset( $instance['tags'] )        ? $instance['tags']  					: false;

		$show_meta    = $instance['show_meta'];

		
		/**
		 * Filter the arguments for the Recent Posts widget.
		 *
		 * @since 3.4.0
		 *
		 * @see WP_Query::get_posts()
		 *
		 * @param array $args An array of arguments used to retrieve the recent posts.
		 */
		$recent_posts =  new WP_Query(  apply_filters( 'customatic_widget_sort_recent_posts_args', array(
						'showposts'   => $number_posts,
						'post_status' => 'publish',
						'post_type'   => 'post',
						'cat'         => $category_ID,
						'tag__in'     => $tag_ID,
						'orderby'     => $orderby ) ) );

		if ( $recent_posts->have_posts() ) : ?>

			<?php echo $before_widget; ?>

			<?php if ( $title ){ echo $before_title . $title . $after_title; } ?>

			<ul class="post-list-widget">

			<?php while( $recent_posts->have_posts($args) ) : $recent_posts->the_post(); ?>

				<li id="post-<?php the_ID(); ?>" class="item-list">
				 	
				 	<div class="content">
						<a href="<?php the_permalink() ?>"><?php the_title(); ?></a>
						
						<?php if( $show_meta ) : ?>
						<div class="entry-meta">
							<?php postvision_post_format(array('before' => '<span class="entry-format">', 'after' => '</span>')); ?>

							<?php postvision_post_date(array('before' => '<span class="entry-date">', 'after' => '</span>')); ?>
						</div>
						<?php endif; ?>
					</div>

				</li><!-- /#post-## -->

			<?php endwhile; ?>

			<?php // Reset the global $the_post as this query will have stomped on it
				wp_reset_postdata();
			?>
			</ul>

			<?php echo $after_widget; ?>

		<?php endif; ?>

		<?php
	}
 	
 	/**
	 * Processes the widget's options to be saved.
	 *
	 * @param array new_instance The new instance of values to be generated via the update.
	 * @param array old_instance The previous instance of values before the update.
	 */
	function update( $new_instance, $old_instance ) {
		$instance = $old_instance;

		// Strip tags from title and name to remove HTML 
		$instance['title']      = strip_tags( $new_instance['title'] );
 		
		$instance['categories'] = strip_tags($new_instance['categories']);
		$instance['tags'] = strip_tags($new_instance['tags']);

		$instance['number_posts'] = $new_instance['number_posts'];
		$instance['show_meta']    = $new_instance['show_meta'];

		$instance['order_by'] = $new_instance['order_by'];
		$instance['order'] = $new_instance['order'];
		$instance['ignore_sticky'] = $new_instance['ignore_sticky'];

		return $instance;
	}

	/**
	 * Generates the administration form for the widget.
	 *
	 * @param  array   instance The/ array of keys and values for the widget.
	 * @return void
	 */
	function form( $instance ) {

		// Set up some default widget settings.
		$defaults = array(
						'title'        => _x('Sort Recent Posts', 'widget_sort_posts', 'PostVision'),
						'order_by'      => 'publish-data',
						'order' => 'desc',
						'number_posts' => 5,
						'show_meta'    => 'on',
						'tags'         => '',
						'categories'   => '' );

		$instance = wp_parse_args( (array) $instance, $defaults ); ?>
		
		<p>
			<label for="<?php echo $this->get_field_id( 'title' ); ?>"><?php _ex('Title', 'widget_sort_posts', 'PostVision'); ?>:</label>
			<input type="text" id="<?php echo $this->get_field_id( 'title' ); ?>" class="widefat" name="<?php echo $this->get_field_name( 'title' ); ?>" value="<?php echo $instance['title']; ?>" />
		</p>

		<p>
			<label for"<?php echo $this->get_field_id('order_by'); ?>"><?php _ex('Sort Posts By') ?></label>
			<select id="<?php echo $this->get_field_id('order_by'); ?>" class="widefat" name="<?php echo $this->get_field_name('order_by'); ?>">
				<option <?php selected($instance['order_by'], 'publish-data'); ?> value="publish-data"><?php _e('Puplish Data'); ?></option>
				<option <?php selected($instance['order_by'], 'most-popular'); ?> value="most-popular"><?php _ex('Most Popular'); ?></option>
				<option <?php selected($instance['order_by'], 'comment-count'); ?> value="comment-count"><?php _ex('Comment Count', 'widget-sort-posts', 'PostVision'); ?></option>
				<option <?php selected($instance['order_by'], 'random'); ?> value="random"><?php _ex('Random', 'widget-sort-posts', 'PostVision'); ?></option>
			</select>
		</p>

		<p>
			<label for="<?php echo esc_attr($this->get_field_id('order')); ?>"><?php _ex('Order', 'widget-sort-posts'); ?></label>
			<select id="<?php echo esc_attr($this->get_field_id('order')); ?>" name="<?php echo esc_attr($this->get_field_name('order')); ?>" class="widefat">
				<option <?php selected($instance['order'], 'desc'); ?> value="desc"><?php _ex('Descending', 'widget-sort-posts', 'PostVision'); ?></option>
				<option <?php selected($instance['order'], 'asc'); ?> value="asc"><?php _ex('Ascending', 'widget-sort-posts', 'PostVision') ?></option>
			</select>
		</p>

		<p>
			<label for="<?php echo $this->get_field_id( 'categories' ); ?>"><?php _ex('Categories', 'widget_sort_posts', 'PostVision'); ?>:</label>
			<input type="text" id="<?php echo $this->get_field_id( 'categories' ); ?>" class="widefat" name="<?php echo $this->get_field_name( 'categories' ); ?>" value="<?php echo $instance['categories']; ?>" />
			<br />
			<small><?php _ex('Categorie IDs, separated by commas.', 'widget_sort_posts', 'PostVision'); ?></small>
		</p>

		<p>
			<label for="<?php echo $this->get_field_id( 'tags' ); ?>"><?php _ex('Tags', 'widget_sort_posts', 'PostVision'); ?>:</label>
			<input type="text" id="<?php echo $this->get_field_id( 'tags' ); ?>" class="widefat" name="<?php echo $this->get_field_name( 'tags' ); ?>" value="<?php echo $instance['tags']; ?>" style="width:100%;" />
			<span><?php _ex('Tag IDs, separated by commas.', 'widget_sort_posts', 'PostVision'); ?></span>
		</p>

		<p>
			<label for="<?php echo $this->get_field_id('number_posts'); ?>"><?php _ex('Number of posts to show', 'widget_sort_posts', 'PostVision'); ?>:</label>
			<input class="widefat" type="number" id="<?php echo $this->get_field_id('number_posts'); ?>" name="<?php echo $this->get_field_name('number_posts'); ?>" value="<?php echo $instance['number_posts']; ?>" />
		</p>

		<p>
			<input class="checkbox" type="checkbox" <?php checked( $instance['show_meta'], "on" ); ?> id="<?php echo $this->get_field_id( 'show_meta' ); ?>" name="<?php echo $this->get_field_name( 'show_meta' ); ?>" /> 
			<label for="<?php echo $this->get_field_id( 'show_meta' ); ?>"><?php _ex('Display Meta post?', 'widget_sort_posts', 'PostVision'); ?></label>
		</p>

		<p>
			<input class="checkbox" type="checkbox" <?php checked( $instance['ignore_sticky'], "on" ); ?> id="<?php echo esc_attr($this->get_field_id( 'ignore_sticky' )); ?>" name="<?php echo esc_attr($this->get_field_name( 'ignore_sticky' )); ?>" /> 
			<label for="<?php echo esc_attr($this->get_field_id( 'ignore_sticky' )); ?>"><?php _ex('Ignore sticky posts?', 'widget-sort-posts', 'PostVision'); ?></label>
		</p>
	<?php
	} // End form
}

add_action( 'widgets_init', create_function( '', 'register_widget("Customatic_Widget_Sort_Recent_Posts");') );