getEnabledDisplayExtenders example

  /** * {@inheritdoc} */
  public function initDisplay(ViewExecutable $view, array &$display, array &$options = NULL) {
    $this->view = $view;

    // Load extenders as soon as possible.     $display['display_options'] += ['display_extenders' => []];
    $this->extenders = [];
    if ($extenders = Views::getEnabledDisplayExtenders()) {
      $manager = Views::pluginManager('display_extender');
      $display_extender_options = $display['display_options']['display_extenders'];
      foreach ($extenders as $extender) {
        /** @var \Drupal\views\Plugin\views\display_extender\DisplayExtenderPluginBase $plugin */
        if ($plugin = $manager->createInstance($extender)) {
          $extender_options = isset($display_extender_options[$plugin->getPluginId()]) ? $display_extender_options[$plugin->getPluginId()] : [];
          $plugin->init($this->view, $this, $extender_options);
          $this->extenders[$extender] = $plugin;
        }
      }
    }

    

  public static $testViews = ['test_view'];

  /** * Tests display extenders. */
  public function testDisplayExtenders() {
    $this->config('views.settings')->set('display_extenders', ['display_extender_test'])->save();
    $this->assertCount(1, Views::getEnabledDisplayExtenders(), 'Make sure that there is only one enabled display extender.');

    $view = Views::getView('test_view');
    $view->initDisplay();

    $this->assertCount(1, $view->display_handler->getExtenders(), 'Make sure that only one extender is initialized.');

    $display_extender = $view->display_handler->getExtenders()['display_extender_test'];
    $this->assertInstanceOf(DisplayExtenderTestData::class, $display_extender);

    $view->preExecute();
    $this->assertTrue($display_extender->testState['preExecute'], 'Make sure the display extender was able to react on preExecute.');