ViewFormBase::getDisplayTabs

public ViewFormBase::getDisplayTabs(ViewUI $view)

public function getDisplayTabs(ViewUI $view) {
  $executable = $view->getExecutable();
  $executable->initDisplay();
  $display_id = $this->displayID;
  $tabs = array();

  // Create a tab for each display.
  foreach ($view->get('display') as $id => $display) {
    // Get an instance of the display plugin, to make sure it will work in the
    // UI.
    $display_plugin = $executable->displayHandlers->get($id);
    if (empty($display_plugin)) {
      continue;
    }

    $tabs[$id] = array(
      '#theme' => 'menu_local_task',
      '#weight' => $display['position'],
      '#link' => array(
        'title' => $this->getDisplayLabel($view, $id),
        'localized_options' => array(),
        'url' => $view->urlInfo('edit-display-form')->setRouteParameter('display_id', $id),
      ),
    );
    if (!empty($display['deleted'])) {
      $tabs[$id]['#link']['localized_options']['attributes']['class'][] = 'views-display-deleted-link';
    }
    if (isset($display['display_options']['enabled']) && !$display['display_options']['enabled']) {
      $tabs[$id]['#link']['localized_options']['attributes']['class'][] = 'views-display-disabled-link';
    }
  }

  // If the default display isn't supposed to be shown, don't display its tab, unless it's the only display.
  if ((!$this->isDefaultDisplayShown($view) && $display_id != 'default') && count($tabs) > 1) {
    $tabs['default']['#access'] = FALSE;
  }

  // Mark the display tab as red to show validation errors.
  $errors = $executable->validate();
  foreach ($view->get('display') as $id => $display) {
    if (!empty($errors[$id])) {
      // Always show the tab.
      $tabs[$id]['#access'] = TRUE;
      // Add a class to mark the error and a title to make a hover tip.
      $tabs[$id]['#link']['localized_options']['attributes']['class'][] = 'error';
      $tabs[$id]['#link']['localized_options']['attributes']['title'] = $this->t('This display has one or more validation errors.');
    }
  }

  return $tabs;
}