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public static function ScssColor::valueCallback in SCSS Compiler 1.0.x

Determines how user input is mapped to an element's #value property.


array $element: An associative array containing the properties of the element.

mixed $input: The incoming input to populate the form element. If this is FALSE, the element's default value should be returned.

\Drupal\Core\Form\FormStateInterface $form_state: The current state of the form.

Return value

mixed The value to assign to the element.

Overrides FormElement::valueCallback


src/Element/ScssColor.php, line 142


A form element to represent null-able Sass colors.




public static function valueCallback(&$element, $input, FormStateInterface $form_state) {

  // Populate the element with a default value if none already exists.
  $element += [
    '#default_value' => '',
  if ($element['#default_value'] instanceof IntermediateColor) {
    $element['#default_value'] = $element['#default_value']

  // Check if the element's default value should be used in lieu of an input.
  if ($input === FALSE) {

    // Replace the input with the element's default value if FALSE.
    $input = $element['#default_value'];
    $input = [
      'enable' => is_string($input) && !empty($input),
      'value' => is_string($input) ? $input : '',

  // Only attempt to process the input (or default value) if it's an array.
  if (is_array($input) && array_key_exists('value', $input)) {
    if (!$element['#required']) {
      $enable = $input['enable'] ?? FALSE;

      // Only return a color value if this element is enabled.
      return $enable ? $input['value'] : '';
    else {

      // Always return a value if the field is required.
      return $input['value'];
  return '';