wp-widget-connector-example.php

<?php

namespace kantoniak {

class AboutMe {

  // ...

  public function __construct() {

    // ...

    add_action('widgets_init', function() {
      register_widget('\kantoniak\AboutMeWidget');
      
      // To pass arguments to widget, see https://wordpress.org/ideas/topic/allow-ability-to-pass-parameters-when-registering-widgets
      global $wp_widget_factory;
      $widget = $wp_widget_factory->widgets['\kantoniak\AboutMeWidget'];
      $widget->setPlugin($this);
    });
  }

  // ...

}

class AboutMeWidget extends \WP_Widget {

    private $plugin;

    // ...

    public function setPlugin($plugin) {
      $this->plugin = $plugin;
    }

    public function widget($args, $instance) {
        echo '<ul>';
        foreach ($this->plugin->getSocialUrlsFromDatabase() as $slug => $url) {
            $name = $this->plugin->getMediaSiteBySlug($slug)['name'];
            $url_prefix = $this->plugin->getMediaSiteBySlug($slug)['url_prefix'];

            echo '<li class="'. $slug .'"><a href="'. $url_prefix . $url .'" alt="'. $name .'">'. $name .'</a></li>';
        }
        echo '</ul>';
    }

    // ...

}

$aboutMe = new AboutMe();

}