<?php

/**

 * Widget API: WP_Widget_Pages class

 *

 * @package WordPress

 * @subpackage Widgets

 * @since 4.4.0

 */

/**

 * Core class used to implement a Pages widget.

 *

 * @since 2.8.0

 *

 * @see WP_Widget

 */

class WP_Widget_Pages extends WP_Widget {

	/**

	 * Sets up a new Pages widget instance.

	 *

	 * @since 2.8.0

	 */

	public function __construct() {

		$widget_ops = array(

			'classname'                   => 'widget_pages',

			'description'                 => __( 'A list of your site’s Pages.' ),

			'customize_selective_refresh' => true,

			'show_instance_in_rest'       => true,

		);

		parent::__construct( 'pages', __( 'Pages' ), $widget_ops );

	}

	/**

	 * Outputs the content for the current Pages widget instance.

	 *

	 * @since 2.8.0

	 *

	 * @param array $args     Display arguments including 'before_title', 'after_title',

	 *                        'before_widget', and 'after_widget'.

	 * @param array $instance Settings for the current Pages widget instance.

	 */

	public function widget( $args, $instance ) {

		$default_title = __( 'Pages' );

		$title         = ! empty( $instance['title'] ) ? $instance['title'] : $default_title;

		/**

		 * Filters the widget title.

		 *

		 * @since 2.6.0

		 *

		 * @param string $title    The widget title. Default 'Pages'.

		 * @param array  $instance Array of settings for the current widget.

		 * @param mixed  $id_base  The widget ID.

		 */

		$title = apply_filters( 'widget_title', $title, $instance, $this->id_base );

		$sortby  = empty( $instance['sortby'] ) ? 'menu_order' : $instance['sortby'];

		$exclude = empty( $instance['exclude'] ) ? '' : $instance['exclude'];

		if ( 'menu_order' === $sortby ) {

			$sortby = 'menu_order, post_title';

		}

		$output = wp_list_pages(

			/**

			 * Filters the arguments for the Pages widget.

			 *

			 * @since 2.8.0

			 * @since 4.9.0 Added the `$instance` parameter.

			 *

			 * @see wp_list_pages()

			 *

			 * @param array $args     An array of arguments to retrieve the pages list.

			 * @param array $instance Array of settings for the current widget.

			 */

			apply_filters(

				'widget_pages_args',

				array(

					'title_li'    => '',

					'echo'        => 0,

					'sort_column' => $sortby,

					'exclude'     => $exclude,

				),

				$instance

			)

		);

		if ( ! empty( $output ) ) {

			echo $args['before_widget'];

			if ( $title ) {

				echo $args['before_title'] . $title . $args['after_title'];

			}

			$format = current_theme_supports( 'html5', 'navigation-widgets' ) ? 'html5' : 'xhtml';

			/** This filter is documented in wp-includes/widgets/class-wp-nav-menu-widget.php */

			$format = apply_filters( 'navigation_widgets_format', $format );

			if ( 'html5' === $format ) {

				// The title may be filtered: Strip out HTML and make sure the aria-label is never empty.

				$title      = trim( strip_tags( $title ) );

				$aria_label = $title ? $title : $default_title;

				echo '<nav aria-label="' . esc_attr( $aria_label ) . '">';

			}

			?>

			<ul>

				<?php echo $output; ?>

			</ul>

			<?php

			if ( 'html5' === $format ) {

				echo '</nav>';

			}

			echo $args['after_widget'];

		}

	}

	/**

	 * Handles updating settings for the current Pages widget instance.

	 *

	 * @since 2.8.0

	 *

	 * @param array $new_instance New settings for this instance as input by the user via

	 *                            WP_Widget::form().

	 * @param array $old_instance Old settings for this instance.

	 * @return array Updated settings to save.

	 */

	public function update( $new_instance, $old_instance ) {

		$instance          = $old_instance;

		$instance['title'] = sanitize_text_field( $new_instance['title'] );

		if ( in_array( $new_instance['sortby'], array( 'post_title', 'menu_order', 'ID' ), true ) ) {

			$instance['sortby'] = $new_instance['sortby'];

		} else {

			$instance['sortby'] = 'menu_order';

		}

		$instance['exclude'] = sanitize_text_field( $new_instance['exclude'] );

		return $instance;

	}

	/**

	 * Outputs the settings form for the Pages widget.

	 *

	 * @since 2.8.0

	 *

	 * @param array $instance Current settings.

	 */

	public function form( $instance ) {

		// Defaults.

		$instance = wp_parse_args(

			(array) $instance,

			array(

				'sortby'  => 'post_title',

				'title'   => '',

				'exclude' => '',

			)

		);

		?>

		<p>

			<label for="<?php echo esc_attr( $this->get_field_id( 'title' ) ); ?>"><?php _e( 'Title:' ); ?></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( $instance['title'] ); ?>" />

		</p>

		<p>

			<label for="<?php echo esc_attr( $this->get_field_id( 'sortby' ) ); ?>"><?php _e( 'Sort by:' ); ?></label>

			<select name="<?php echo esc_attr( $this->get_field_name( 'sortby' ) ); ?>" id="<?php echo esc_attr( $this->get_field_id( 'sortby' ) ); ?>" class="widefat">

				<option value="post_title"<?php selected( $instance['sortby'], 'post_title' ); ?>><?php _e( 'Page title' ); ?></option>

				<option value="menu_order"<?php selected( $instance['sortby'], 'menu_order' ); ?>><?php _e( 'Page order' ); ?></option>

				<option value="ID"<?php selected( $instance['sortby'], 'ID' ); ?>><?php _e( 'Page ID' ); ?></option>

			</select>

		</p>

		<p>

			<label for="<?php echo esc_attr( $this->get_field_id( 'exclude' ) ); ?>"><?php _e( 'Exclude:' ); ?></label>

			<input type="text" value="<?php echo esc_attr( $instance['exclude'] ); ?>" name="<?php echo esc_attr( $this->get_field_name( 'exclude' ) ); ?>" id="<?php echo esc_attr( $this->get_field_id( 'exclude' ) ); ?>" class="widefat" />

			<br />

			<small><?php _e( 'Page IDs, separated by commas.' ); ?></small>

		</p>

		<?php

	}

}