3 namespace Drupal\text\Plugin\Field\FieldFormatter;
5 use Drupal\Core\Field\FormatterBase;
6 use Drupal\Core\Field\FieldItemListInterface;
7 use Drupal\Core\Form\FormStateInterface;
10 * Plugin implementation of the 'text_trimmed' formatter.
12 * Note: This class also contains the implementations used by the
13 * 'text_summary_or_trimmed' formatter.
15 * @see \Drupal\text\Field\Formatter\TextSummaryOrTrimmedFormatter
18 * id = "text_trimmed",
19 * label = @Translation("Trimmed"),
30 class TextTrimmedFormatter extends FormatterBase {
35 public static function defaultSettings() {
37 'trim_length' => '600',
38 ] + parent::defaultSettings();
44 public function settingsForm(array $form, FormStateInterface $form_state) {
45 $element['trim_length'] = [
46 '#title' => t('Trimmed limit'),
48 '#field_suffix' => t('characters'),
49 '#default_value' => $this->getSetting('trim_length'),
50 '#description' => t('If the summary is not set, the trimmed %label field will end at the last full sentence before this character limit.', ['%label' => $this->fieldDefinition->getLabel()]),
60 public function settingsSummary() {
62 $summary[] = t('Trimmed limit: @trim_length characters', ['@trim_length' => $this->getSetting('trim_length')]);
69 public function viewElements(FieldItemListInterface $items, $langcode) {
72 $render_as_summary = function (&$element) {
73 // Make sure any default #pre_render callbacks are set on the element,
74 // because text_pre_render_summary() must run last.
75 $element += \Drupal::service('element_info')->getInfo($element['#type']);
76 // Add the #pre_render callback that renders the text into a summary.
77 $element['#pre_render'][] = [TextTrimmedFormatter::class, 'preRenderSummary'];
78 // Pass on the trim length to the #pre_render callback via a property.
79 $element['#text_summary_trim_length'] = $this->getSetting('trim_length');
82 // The ProcessedText element already handles cache context & tag bubbling.
83 // @see \Drupal\filter\Element\ProcessedText::preRenderText()
84 foreach ($items as $delta => $item) {
86 '#type' => 'processed_text',
88 '#format' => $item->format,
89 '#langcode' => $item->getLangcode(),
92 if ($this->getPluginId() == 'text_summary_or_trimmed' && !empty($item->summary)) {
93 $elements[$delta]['#text'] = $item->summary;
96 $elements[$delta]['#text'] = $item->value;
97 $render_as_summary($elements[$delta]);
105 * Pre-render callback: Renders a processed text element's #markup as a summary.
107 * @param array $element
108 * A structured array with the following key-value pairs:
109 * - #markup: the filtered text (as filtered by filter_pre_render_text())
110 * - #format: containing the machine name of the filter format to be used to
111 * filter the text. Defaults to the fallback format. See
112 * filter_fallback_format().
113 * - #text_summary_trim_length: the desired character length of the summary
114 * (used by text_summary())
117 * The passed-in element with the filtered text in '#markup' trimmed.
119 * @see filter_pre_render_text()
120 * @see text_summary()
122 public static function preRenderSummary(array $element) {
123 $element['#markup'] = text_summary($element['#markup'], $element['#format'], $element['#text_summary_trim_length']);