Generates themed output early in a page request.
\Drupal\system\Tests\Theme\ThemeEarlyInitializationTest::testRequestListener()
public function onRequest(GetResponseEvent $event) {
$request = $event
->getRequest();
$current_path = $request->attributes
->get('system_path');
if ($current_path == '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_theme_rebuild();
// 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.
$GLOBALS['theme_test_output'] = theme('more_link', array(
'url' => 'user',
'title' => 'Themed output generated in a KernelEvents::REQUEST listener',
));
}
if (strpos($current_path, 'user/autocomplete') === 0) {
// Register a fake registry loading callback. If it gets called by
// theme_get_registry(), the registry has not been initialized yet.
_theme_registry_callback('_theme_test_load_registry', array());
}
}