# neon
factories:
    foo:
        class: LoginForm(@user)

# presenter

protected function createComponentLoginForm()
{
    return $this->getContext()->createFoo();
}

# komponenta

class LoginForm extends Nette\Application\UI\Form
{
    private $user;
    public function __construct($user)
    {
        parent::__construct();
        $this->user = $user;
    }
}