function FileWidget::process

Form API callback: Processes a file_generic field element.

Expands the file_generic type to include the description and display fields.

This method is assigned as a #process callback in formElement() method.

File

core/modules/file/src/Plugin/Field/FieldWidget/FileWidget.php, line 392

Class

FileWidget

Plugin implementation of the 'file_generic' widget.

Namespace

Code

public static function process($element, FormStateInterface $form_state, $form) {
    $item = $element['#value'];
    $item['fids'] = $element['fids']['#value'];
    // Add the display field if enabled.
    if ($element['#display_field']) {
        $element['display'] = [
            '#type' => empty($item['fids']) ? 'hidden' : 'checkbox',
            '#title' => new TranslatableMarkup('Include file in display'),
            '#attributes' => [
                'class' => [
                    'file-display',
                ],
            ],
        ];
        if (isset($item['display'])) {
            $element['display']['#value'] = $item['display'] ? '1' : '';
        }
        else {
            $element['display']['#value'] = $element['#display_default'];
        }
    }
    else {
        $element['display'] = [
            '#type' => 'hidden',
            '#value' => '1',
        ];
    }
    // Add the description field if enabled.
    if ($element['#description_field'] && $item['fids']) {
        $config = \Drupal::config('file.settings');
        $element['description'] = [
            '#type' => $config->get('description.type'),
            '#title' => new TranslatableMarkup('Description'),
            '#value' => $item['description'] ?? '',
            '#maxlength' => $config->get('description.length'),
            '#description' => new TranslatableMarkup('The description may be used as the label of the link to the file.'),
        ];
    }
    // Adjust the Ajax settings so that on upload and remove of any individual
    // file, the entire group of file fields is updated together.
    if ($element['#cardinality'] != 1) {
        $parents = array_slice($element['#array_parents'], 0, -1);
        $new_options = [
            'query' => [
                'element_parents' => implode('/', $parents),
            ],
        ];
        $field_element = NestedArray::getValue($form, $parents);
        $new_wrapper = $field_element['#id'] . '-ajax-wrapper';
        foreach (Element::children($element) as $key) {
            if (isset($element[$key]['#ajax'])) {
                $element[$key]['#ajax']['options'] = $new_options;
                $element[$key]['#ajax']['wrapper'] = $new_wrapper;
            }
        }
        unset($element['#prefix'], $element['#suffix']);
    }
    // Add another submit handler to the upload and remove buttons, to implement
    // functionality needed by the field widget. This submit handler, along with
    // the rebuild logic in file_field_widget_form() requires the entire field,
    // not just the individual item, to be valid.
    foreach ([
        'upload_button',
        'remove_button',
    ] as $key) {
        $element[$key]['#submit'][] = [
            static::class,
            'submit',
        ];
        $element[$key]['#limit_validation_errors'] = [
            array_slice($element['#parents'], 0, -1),
        ];
    }
    return $element;
}