getLayoutDefinition example

public function getLayoutSettings() {
    return $this->getThirdPartySetting('field_layout', 'settings', []);
  }

  /** * Implements \Drupal\field_layout\Display\EntityDisplayWithLayoutInterface::setLayoutId(). */
  public function setLayoutId($layout_id, array $layout_settings = []) {
    if ($this->getLayoutId() !== $layout_id) {
      // @todo Devise a mechanism for mapping old regions to new ones in       // https://www.drupal.org/node/2796877.       $layout_definition = $this->getLayoutDefinition($layout_id);
      $new_region = $layout_definition->getDefaultRegion();
      $layout_regions = $layout_definition->getRegions();
      foreach ($this->getComponents() as $name => $component) {
        if (isset($component['region']) && !isset($layout_regions[$component['region']])) {
          $component['region'] = $new_region;
          $this->setComponent($name, $component);
        }
      }
    }
    $this->setThirdPartySetting('field_layout', 'id', $layout_id);
    // Instantiate the plugin and consult it for the updated plugin