<?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&#8217;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
}
}