AgeFieldFormatter.php in Age Field Formatter 8

Namespace

Drupal\age_field_formatter\Plugin\Field\FieldFormatter

File

src/Plugin/Field/FieldFormatter/AgeFieldFormatter.php

<?php

namespace Drupal\age_field_formatter\Plugin\Field\FieldFormatter;

use Drupal\Component\Utility\Html;
use Drupal\Core\Field\FieldItemInterface;
use Drupal\Core\Field\FieldItemListInterface;
use Drupal\Core\Field\FormatterBase;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Datetime\DrupalDateTime;

/**
 * Plugin implementation of the 'age_field_formatter' formatter.
 *
 * @FieldFormatter(
 *   id = "age_field_formatter",
 *   label = @Translation("Age formatter"),
 *   field_types = {
 *     "datetime"
 *   }
 * )
 */
class AgeFieldFormatter extends FormatterBase {

  /**
   * {@inheritdoc}
   */
  public static function defaultSettings() {
    $options = parent::defaultSettings();
    $options['age_format'] = TRUE;
    $options['year_suffix'] = TRUE;
    return $options;
  }

  /**
   * {@inheritdoc}
   */
  public function settingsForm(array $form, FormStateInterface $form_state) {
    $elements = parent::settingsForm($form, $form_state);
    $age_formats = [
      'birthdate' => $this
        ->t('Date plus Age with label'),
      'birthdate_nolabel' => $this
        ->t('Date with no Age label'),
      'age_only' => $this
        ->t('Age only'),
    ];
    $elements['age_format'] = [
      '#type' => 'select',
      '#title' => $this
        ->t('Date/age format'),
      '#options' => $age_formats,
      '#default_value' => $this
        ->getSetting('age_format'),
    ];
    $elements['year_suffix'] = [
      '#type' => 'checkbox',
      '#title' => $this
        ->t('Display a “years” suffix after the age'),
      '#default_value' => $this
        ->getSetting('year_suffix'),
    ];
    return $elements;
  }

  /**
   * {@inheritdoc}
   */
  public function settingsSummary() {
    $summary = [];

    // Implement settings summary.
    $setting = $this
      ->getSetting('age_format');
    $year_suffix = $this
      ->getSetting('year_suffix');
    $year_suffix_summary = $this
      ->t('years suffix');
    if ($setting == 'age_only') {
      $format = $this
        ->t('age only');
    }
    elseif ($setting == 'birthdate_nolabel') {
      $format = $this
        ->t('date (age)');
    }
    else {
      $format = $this
        ->t('date (age: xx)');
    }
    if ($year_suffix == true) {
      $format = $format . ' + ' . $year_suffix_summary;
    }
    $summary[] = $this
      ->t('Age format: %format', array(
      '%format' => $format,
    ));
    return $summary;
  }

  /**
   * {@inheritdoc}
   */
  public function viewElements(FieldItemListInterface $items, $langcode) {
    $elements = [];
    foreach ($items as $delta => $item) {
      $elements[$delta] = [
        '#markup' => $this
          ->viewValue($item),
      ];
    }
    return $elements;
  }

  /**
   * Generate the output appropriate for one field item.
   *
   * @param \Drupal\Core\Field\FieldItemInterface $item
   *   One field item.
   *
   * @return string
   *   The textual output generated.
   */
  protected function viewValue(FieldItemInterface $item) {
    $from = new DrupalDateTime($item->date);
    $to = new DrupalDateTime();
    $age = $from
      ->diff($to)->y;
    $agelabel = $this
      ->t('Age');
    $setting = $this
      ->getSetting('age_format');
    $year_suffix = $this
      ->getSetting('year_suffix');
    if ($year_suffix == true) {
      $age_suffix = $this->stringTranslation
        ->formatPlural($age, 'year', 'years');
      $age = $age . ' ' . $age_suffix;
    }
    if ($setting == 'birthdate') {
      $age_formatted = $item->value . " (" . $agelabel . ": " . $age . ")";
    }
    elseif ($setting == 'birthdate_nolabel') {
      $age_formatted = $item->value . " (" . $age . ")";
    }
    else {
      $age_formatted = $age;

      // We do not force prefix a label to the value.
    }
    return nl2br(Html::escape($age_formatted));
  }

}

Classes

Name	Description
AgeFieldFormatter	Plugin implementation of the 'age_field_formatter' formatter.