public function AmpTextTrimmedFormatter::viewElements in Accelerated Mobile Pages (AMP) 8.3

Same name and namespace in other branches

1. 8 src/Plugin/Field/FieldFormatter/AmpTextTrimmedFormatter.php \Drupal\amp\Plugin\Field\FieldFormatter\AmpTextTrimmedFormatter::viewElements()
2. 8.2 src/Plugin/Field/FieldFormatter/AmpTextTrimmedFormatter.php \Drupal\amp\Plugin\Field\FieldFormatter\AmpTextTrimmedFormatter::viewElements()

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 TextTrimmedFormatter::viewElements

File

src/Plugin/Field/FieldFormatter/AmpTextTrimmedFormatter.php, line 28

Class

AmpTextTrimmedFormatter

Plugin implementation of the 'amp_text_trimmed' formatter.

Namespace

Drupal\amp\Plugin\Field\FieldFormatter

Code

public function viewElements(FieldItemListInterface $items, $langcode) {

  // We're overriding nearly all the parent logic verbatim, except setting
  // the #type to amp_processed_text. The reason we don't call the parent,
  // and then simply override the #type in the render array, is that we want
  // the potential call to \Drupal::service('element_info')->getInfo to only
  // happen _after_ #type has been set to amp_processed_text, so we are
  // assured that we get the complete set of expected #pre_render hooks, and
  // other relevant info.
  // @see \Drupal\amp\Element\AmpProcessedText::getInfo
  $elements = [];
  $render_as_summary = function (&$element) {

    // Make sure any default #pre_render callbacks are set on the element,
    // because text_pre_render_summary() must run last.
    $element += \Drupal::service('element_info')
      ->getInfo($element['#type']);

    // Add the #pre_render callback that renders the text into a summary.
    $element['#pre_render'][] = [
      TextTrimmedFormatter::class,
      'preRenderSummary',
    ];

    // Pass on the trim length to the #pre_render callback via a property.
    $element['#text_summary_trim_length'] = $this
      ->getSetting('trim_length');
  };

  // The ProcessedText element already handles cache context & tag bubbling.
  // @see \Drupal\filter\Element\ProcessedText::preRenderText()
  foreach ($items as $delta => $item) {
    $elements[$delta] = [
      '#type' => 'amp_processed_text',
      '#text' => NULL,
      '#format' => $item->format,
      '#langcode' => $item
        ->getLangcode(),
    ];
    if ($this
      ->getPluginId() == 'amp_text_summary_or_trimmed' && !empty($item->summary)) {
      $elements[$delta]['#text'] = $item->summary;
    }
    else {
      $elements[$delta]['#text'] = $item->value;
      $render_as_summary($elements[$delta]);
    }
  }
  return $elements;
}