class SwitchToLiveForm

class SwitchToLiveForm extends ConfirmFormBase implements WorkspaceFormInterface, ContainerInjectionInterface {
    
    /**
     * The workspace manager.
     *
     * @var \Drupal\workspaces\WorkspaceManagerInterface
     */
    protected $workspaceManager;
    
    /**
     * Constructs a new SwitchToLiveForm.
     *
     * @param \Drupal\workspaces\WorkspaceManagerInterface $workspace_manager
     *   The workspace manager.
     */
    public function __construct(WorkspaceManagerInterface $workspace_manager) {
        $this->workspaceManager = $workspace_manager;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container) {
        return new static($container->get('workspaces.manager'));
    }
    
    /**
     * {@inheritdoc}
     */
    public function getFormId() {
        return 'switch_to_live_form';
    }
    
    /**
     * {@inheritdoc}
     */
    public function getQuestion() {
        return $this->t('Would you like to switch to the live version of the site?');
    }
    
    /**
     * {@inheritdoc}
     */
    public function getDescription() {
        return $this->t('Switch to the live version of the site.');
    }
    
    /**
     * {@inheritdoc}
     */
    public function getCancelUrl() {
        return new Url('<current>');
    }
    
    /**
     * {@inheritdoc}
     */
    public function submitForm(array &$form, FormStateInterface $form_state) {
        $this->workspaceManager
            ->switchToLive();
        $this->messenger()
            ->addMessage($this->t('You are now viewing the live version of the site.'));
    }

}