setDefaultOptions example

    $default_display = $executable->newDisplay('default', 'Default', 'default');
    foreach ($display_options['default'] as $option => $value) {
      $default_display->setOption($option, $value);
    }

    // Display: Page     if (isset($display_options['page'])) {
      $display = $executable->newDisplay('page', 'Page', 'page_1');
      // The page display is usually the main one (from the user's point of       // view). Its options should therefore become the overall view defaults,       // so that new displays which are added later automatically inherit them.       $this->setDefaultOptions($display_options['page'], $display, $default_display);

      // Display: Feed (attached to the page).       if (isset($display_options['feed'])) {
        $display = $executable->newDisplay('feed', 'Feed', 'feed_1');
        $this->setOverrideOptions($display_options['feed'], $display, $default_display);
      }
    }

    // Display: Block.     if (isset($display_options['block'])) {
      $display = $executable->newDisplay('block', 'Block', 'block_1');