function ThemeTestSubscriber::onRequest

Generates themed output early in a page request.

See also

\Drupal\system\Tests\Theme\ThemeEarlyInitializationTest::testRequestListener()

File

core/modules/system/tests/modules/theme_test/src/EventSubscriber/ThemeTestSubscriber.php, line 59

Class

ThemeTestSubscriber

Theme test subscriber for controller requests.

Namespace

Code

public function onRequest(RequestEvent $event) {
    if ($this->currentRouteMatch
        ->getRouteName() === 'theme_test.request_listener') {
        // First, force the theme registry to be rebuilt on this page request.
        // This allows us to test a full initialization of the theme system in
        // the code below.
        \Drupal::service('theme.registry')->reset();
        // Next, initialize the theme system by storing themed text in a global
        // variable. We will use this later in
        // theme_test_request_listener_page_callback() to test that even when the
        // theme system is initialized this early, it is still capable of
        // returning output and theming the page as a whole.
        $more_link = [
            '#type' => 'more_link',
            '#url' => Url::fromRoute('user.page'),
            '#attributes' => [
                'title' => 'Themed output generated in a KernelEvents::REQUEST listener',
            ],
        ];
        $GLOBALS['theme_test_output'] = $this->renderer
            ->renderInIsolation($more_link);
    }
}