Apply Treetops fix to Monolith Relative Widgets

[simonpmiles]

<?php

add_action('widgets_init', function() {
    register_widget('MonolithRelativePagesWidget');
});

class MonolithRelativePagesWidget extends WP_Widget {

    /**
     * Register widget with WordPress.
     */
    public function __construct() {
        // widget actual processes
        parent::__construct(
            'monolith_relative_pages_widget',
            __('Monolith Relative Pages', 'monolith'),
            array('description' => __('Display relatives of current page.', 'monolith'), )
        );
    }

    /**
     * Front-end display of widget.
     *
     * @param array $args Widget arguments.
     * @param array $instance Saved values from database.
     */
    public function widget( $args, $instance ) {
        // outputs the content of the widget

        $title = apply_filters( 'monolith_upcoming_events_widget', $instance['title'] );
        $page = apply_filters( 'monolith_upcoming_events_widget', $instance['page'] );
        global $post;

        if ($page) {
            $queried_post = get_post($page);
        } else {
                $queried_post = $post;
        }

        $children = get_pages('child_of='.$queried_post->ID); // get all child pages
        $has_children = ($children) ? true : false; // check if this page has children
        $has_parent = ($queried_post->post_parent) ? true : false; // check if it has a parent

        // now conditionally display the menu depending on the parent / child conditions
        if ($has_children) {
            $output = wp_list_pages(array('child_of' => $queried_post->ID, 'echo' => 0, 'depth' => 2, 'title_li' => '', 'sort_column'  => 'menu_order, post_title'));
            //$title = get_the_title();
            $parent_link = get_permalink($queried_post->ID);
        } elseif ($has_parent) {
            $output = wp_list_pages(array('child_of' => $queried_post->post_parent, 'echo' => 0, 'depth' => 1, 'title_li' => '', 'sort_column'  => 'menu_order, post_title'));
            //$title = get_the_title($post->post_parent);
            $parent_link = get_permalink($queried_post->post_parent);

        }

        echo $args['before_widget'];

        if ($has_children || $has_parent) : ?>

            <div class="widget">
                <?php if($title) : ?>
                  <h3><?= $title ?></h3>
                <?php endif; ?>
                <ul class="sidebar-menu">
                    <?php /* if(is_related(101)) : ?>
                        <li class="page_item <?= is_page(101) ? 'current_page_item' : '' ?>">
                            <a href="<?= get_permalink(101) ?>">All Events</a>
                        </li>
                    <?php endif; */ ?>

                    <?php if($has_parent) : ?>
                        <li class="page_item <?= $page == $post->ID ? 'current_page_item' : ''  ?>">
                            <a href="<?= $parent_link ?>"><?= $queried_post->post_title ?></a>
                          </li>
                    <?php endif;?>

                  <?= $output; ?>
                </ul>
            </div>

        <?php endif;

        echo $args['after_widget'];
    }

    /**
     * Back-end widget form.
     *
     * @see WP_Widget::form()
     *
     * @param array $instance The widget options
     * @param array $instance Previously saved values from database.
     *
     * @return string|void (DO NOT RETURN ANYTHING HERE THOUGH)
     */
    public function form( $instance ) {
        // outputs the options form on admin

        $page = (isset($instance['page'])) ? $instance['page'] : __('');
        $title = (isset($instance['title'])) ? $instance['title'] : __('');

        ?>

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

            <label for="<?php echo $this->get_field_id( 'page' ); ?>"><?php _e( 'Specify Page' ); ?></label>
            <select class="widefat" id="<?php echo $this->get_field_id( 'page' ); ?>" name="<?php echo $this->get_field_name( 'page' ); ?>">
                <option value="0"<?= ((int)esc_attr( $page ) === 0) ? ' selected' : '' ?>>Current</option>
                <?php foreach (get_pages() as $p) : ?>
                    <option value="<?= $p->ID ?>"<?= ((int)esc_attr( $page ) === (int)$p->ID) ? ' selected' : '' ?>><?= $p->post_title ?></option>
                <?php endforeach; ?>
            </select>
        </p>

    <?php

    }

    /**
     * Processing widget options on save
     *
     * @param array $new_instance The new options
     * @param array $old_instance The previous options
     * @return array|void
     */
    public function update( $new_instance, $old_instance ) {
        // processes widget options to be saved
        $instance = array();
        $instance['title'] = (!empty($new_instance['title'])) ? strip_tags($new_instance['title']) : '';
        $instance['page'] = (!empty($new_instance['page'])) ? strip_tags($new_instance['page']) : '';
        return $instance;
    }
}