function Text3Widget::formElement

File

modules/field_example/src/Plugin/Field/FieldWidget/Text3Widget.php, line 26

Class

Text3Widget

Plugin implementation of the 'field_example_3text' widget.

Namespace

Code

public function formElement(FieldItemListInterface $items, $delta, array $element, array &$form, FormStateInterface $form_state) {
  $value = $items[$delta]->value ?? '';
  // Parse the single hex string into RBG values.
  if (!empty($value)) {
    preg_match_all('@..@', substr($value, 1), $match);
  }
  else {
    $match = [
      [],
    ];
  }
  // Set up the form element for this widget.
  $element += [
    '#type' => 'details',
    '#element_validate' => [
      [
        $this,
        'validate',
      ],
    ],
  ];
  // Add in the RGB textfield elements.
  foreach ([
    'r' => $this->t('Red'),
    'g' => $this->t('Green'),
    'b' => $this->t('Blue'),
  ] as $key => $title) {
    $element[$key] = [
      '#type' => 'textfield',
      '#title' => $title,
      '#size' => 2,
      '#default_value' => array_shift($match[0]),
      '#attributes' => [
        'class' => [
          'rgb-entry',
        ],
      ],
      '#description' => $this->t('The 2-digit hexadecimal representation of @color saturation, like "a1" or "ff"', [
        '@color' => $title,
      ]),
    ];
    // Since Form API doesn't allow a fieldset to be required, we
    // have to require each field element individually.
    if ($element['#required']) {
      $element[$key]['#required'] = TRUE;
    }
  }
  return [
    'value' => $element,
  ];
}