FieldUiTable::preRenderRegionRows

public static FieldUiTable::preRenderRegionRows($elements)

public static function preRenderRegionRows($elements) {
  // Determine the colspan to use for region rows, by checking the number of
  // columns in the headers.
  $columns_count = 0;
  foreach ($elements['#header'] as $header) {
    $columns_count += (is_array($header) && isset($header['colspan']) ? $header['colspan'] : 1);
  }

  $rows = [];
  foreach (Element::children($elements) as $key) {
    $rows[$key] = $elements[$key];
    unset($elements[$key]);
  }

  // Render rows, region by region.
  foreach ($elements['#regions'] as $region_name => $region) {
    $region_name_class = Html::getClass($region_name);

    // Add region rows.
    if (isset($region['title']) && empty($region['invisible'])) {
      $elements['#rows'][] = [
        'class' => [
          'region-title',
          'region-' . $region_name_class . '-title'
        ],
        'no_striping' => TRUE,
        'data' => [
          ['data' => $region['title'], 'colspan' => $columns_count],
        ],
      ];
    }
    if (isset($region['message'])) {
      $class = (empty($region['rows_order']) ? 'region-empty' : 'region-populated');
      $elements['#rows'][] = [
        'class' => [
          'region-message',
          'region-' . $region_name_class . '-message', $class,
        ],
        'no_striping' => TRUE,
        'data' => [
          ['data' => $region['message'], 'colspan' => $columns_count],
        ],
      ];
    }

    // Add form rows, in the order determined at pre-render time.
    foreach ($region['rows_order'] as $name) {
      $element = $rows[$name];

      $row = ['data' => []];
      if (isset($element['#attributes'])) {
        $row += $element['#attributes'];
      }

      // Render children as table cells.
      foreach (Element::children($element) as $cell_key) {
        $child = $element[$cell_key];
        // Do not render a cell for children of #type 'value'.
        if (!(isset($child['#type']) && $child['#type'] == 'value')) {
          $cell = ['data' => $child];
          if (isset($child['#cell_attributes'])) {
            $cell += $child['#cell_attributes'];
          }
          $row['data'][] = $cell;
        }
      }
      $elements['#rows'][] = $row;
    }
  }

  return $elements;
}