public function BarcodeFormatterPng::viewElements in Barcode 8

Builds a renderable array for a field value.

Parameters

\Drupal\Core\Field\FieldItemListInterface $items: The field values to be rendered.

string $langcode: The language that should be used to render the field.

Return value

array A renderable array for $items, as an array of child elements keyed by consecutive numeric indexes starting from 0.

Overrides FormatterInterface::viewElements

File

src/Plugin/Field/FieldFormatter/BarcodeFormatterPng.php, line 24

Class

BarcodeFormatterPng

Plugin implementation of the barcode PNG formatter.

Namespace

Drupal\barcode\Plugin\Field\FieldFormatter

Code

public function viewElements(FieldItemListInterface $items, $langcode) {
  $settings = $this
    ->getSettings();
  $background = $settings['background'] ? '#' . $settings['background'] : '#FFFFFF';
  $foreground = $settings['foreground'] ? '#' . $settings['foreground'] : '#000000';
  foreach ($items as $delta => $item) {
    $barcode = $this
      ->generateBarcode($item, $background, $foreground);
    $element[$delta] = [
      '#theme' => 'barcode',
      '#data' => $item,
      '#barcode' => [
        '#type' => 'html_tag',
        '#tag' => 'img',
        '#attributes' => [
          'alt' => $item->types[$item->type]['name'] . ': ' . $item->value,
          'src' => 'data:image/png;base64, ' . base64_encode($barcode
            ->getPngData()),
        ],
      ],
    ];
  }
  return $element;
}