widget.php

<?php

/**
 * Adds Ritmo_Widget widget.
 */
class Ritmo_Widget extends WP_Widget
{

	/**
	 * Register widget with WordPress.
	 */
	function __construct()
	{
		parent::__construct(
			'ritmo_widget',
			__('Ritmo', 'ritmo'),
			array('description' => __('Ritmo widget', 'ritmo'),)
		);
	}

	/**
	 * Front-end display of widget.
	 *
	 * @see WP_Widget::widget()
	 *
	 * @param array $args Widget arguments.
	 * @param array $instance Saved values from database.
	 */
	public function widget($args, $instance)
	{
		echo $args['before_widget'];
		if (!empty($instance['title'])) {
			echo $args['before_title'] . apply_filters('widget_title', $instance['title']) . $args['after_title'];
		}

		if (isset($instance['url'])) {

			$ritmo_url = parse_url($instance['url']);
			$embed_url = 'http://embed.ritmo.ir' . $ritmo_url['path'];

			echo '<iframe src="' . $embed_url . '" style="border:none" width="300" height="379"></iframe>';
		}

		echo $args['after_widget'];
	}

	/**
	 * Back-end widget form.
	 *
	 * @see WP_Widget::form()
	 *
	 * @param array $instance Previously saved values from database.
	 * @return string|void
	 */
	public function form($instance)
	{
		$title = !empty($instance['title']) ? $instance['title'] : __('Ritmo player', 'ritmo');
		$url = !empty($instance['url']) ? $instance['url'] : '';
		include dirname(__FILE__) . "/templates/ritmo-widget.php";
	}

	/**
	 * Sanitize widget form values as they are saved.
	 *
	 * @see WP_Widget::update()
	 *
	 * @param array $new_instance Values just sent to be saved.
	 * @param array $old_instance Previously saved values from database.
	 *
	 * @return array Updated safe values to be saved.
	 */
	public function update($new_instance, $old_instance)
	{
		$instance = array();
		$instance['title'] = (!empty($new_instance['title'])) ? strip_tags($new_instance['title']) : '';
		$instance['url'] = (!empty($new_instance['url'])) ? $new_instance['url'] : '';

		return $instance;
	}

}

// register widget
function register_ritmo_widget()
{
	register_widget('Ritmo_Widget');
}

add_action('widgets_init', 'register_ritmo_widget');