class RulesComponentEditForm

class RulesComponentEditForm extends RulesComponentFormBase {
    
    /**
     * The RulesUI handler of the currently active UI.
     *
     * @var \Drupal\rules\Ui\RulesUiConfigHandler
     */
    protected $rulesUiHandler;
    
    /**
     * {@inheritdoc}
     */
    public function buildForm(array $form, FormStateInterface $form_state, RulesUiConfigHandler $rules_ui_handler = NULL) {
        // Overridden such we can receive further route parameters.
        $this->rulesUiHandler = $rules_ui_handler;
        return parent::buildForm($form, $form_state);
    }
    
    /**
     * {@inheritdoc}
     */
    protected function prepareEntity() {
        parent::prepareEntity();
        // Replace the config entity with the latest entity from temp store, so any
        // interim changes are picked up.
        $this->entity = $this->rulesUiHandler
            ->getConfig();
    }
    
    /**
     * {@inheritdoc}
     */
    public function form(array $form, FormStateInterface $form_state) {
        // CSS to make form easier to use. Load this at end so we can override
        // styles added by #theme table.
        $form['#attached']['library'][] = 'rules/rules_ui.styles';
        $form = $this->rulesUiHandler
            ->getForm()
            ->buildForm($form, $form_state);
        return parent::form($form, $form_state);
    }
    
    /**
     * {@inheritdoc}
     */
    public function validateForm(array &$form, FormStateInterface $form_state) {
        parent::validateForm($form, $form_state);
        $this->rulesUiHandler
            ->getForm()
            ->validateForm($form, $form_state);
    }
    
    /**
     * {@inheritdoc}
     */
    protected function actions(array $form, FormStateInterface $form_state) {
        $actions = parent::actions($form, $form_state);
        $actions['submit']['#value'] = $this->t('Save');
        $actions['cancel'] = [
            '#type' => 'submit',
            '#limit_validation_errors' => [
                [
                    'locked',
                ],
            ],
            '#value' => $this->t('Cancel'),
            '#submit' => [
                '::cancel',
            ],
        ];
        return $actions;
    }
    
    /**
     * {@inheritdoc}
     */
    public function save(array $form, FormStateInterface $form_state) {
        $this->rulesUiHandler
            ->getForm()
            ->submitForm($form, $form_state);
        $component = $this->rulesUiHandler
            ->getComponent();
        $this->entity
            ->updateFromComponent($component);
        // Persist changes by saving the entity.
        parent::save($form, $form_state);
        // Also remove the temporarily stored component, it has been persisted now.
        $this->rulesUiHandler
            ->clearTemporaryStorage();
        $this->messenger()
            ->addMessage($this->t('Rule component %label has been updated.', [
            '%label' => $this->entity
                ->label(),
        ]));
    }
    
    /**
     * Form submission handler for the 'cancel' action.
     */
    public function cancel(array $form, FormStateInterface $form_state) {
        $this->rulesUiHandler
            ->clearTemporaryStorage();
        $this->messenger()
            ->addMessage($this->t('Canceled.'));
        $form_state->setRedirect('entity.rules_component.collection');
    }
    
    /**
     * Title callback: also display the rule label.
     */
    public function getTitle($rules_component) {
        return $this->t('Edit rules component "@label"', [
            '@label' => $rules_component->label(),
        ]);
    }

}