Auth_Basic::showLoginForm PHP Method

    public function showLoginForm()
    {
        $this->app->template->trySet('page_title', 'Login');
        if ($this->app->layout && $this->login_layout_class) {
            $this->app->layout->destroy();
            $this->app->add($this->login_layout_class);
            /** @type Page $p */
            $p = $this->app->layout->add('Page', null, null, array('page/login'));
        } else {
            /** @type Page $p */
            $p = $this->app->add('Page', null, null, array('page/login'));
        }
        $this->app->page_object = $p;
        // hook: createForm use this to build basic login form
        $this->form = $this->hook('createForm', array($p));
        // If no hook, build standard form
        if (!is_object($this->form)) {
            $this->form = $this->createForm($p);
        }
        $this->hook('updateForm');
        $f = $this->form;
        if ($f->isSubmitted()) {
            $id = $this->verifyCredentials($f->get('username'), $f->get('password'));
            if ($id) {
                $this->loginByID($id);
                $this->loggedIn($f->get('username'), $f->get('password'));
                exit;
            }
            $f->getElement('password')->displayFieldError('Incorrect login information');
        }
        return $p;
    }