Expanded class hierarchy of AbstractFormEvent in Hook Event Dispatcher 3.x
- class \Drupal\core_event_dispatcher\Event\Form\AbstractFormEvent extends \Symfony\Component\EventDispatcher\Event implements EventInterface
- class \Drupal\core_event_dispatcher\Event\Form\FormAlterEvent
- class \Drupal\core_event_dispatcher\Event\Form\FormBaseAlterEvent
- class \Drupal\core_event_dispatcher\Event\Form\FormIdAlterEvent