function FileWidget::formMultipleElements

Overrides \Drupal\Core\Field\WidgetBase::formMultipleElements().

Special handling for draggable multiple widgets and 'add more' button.

Overrides WidgetBase::formMultipleElements

File

core/modules/file/src/Plugin/Field/FieldWidget/FileWidget.php, line 94

Class

FileWidget

Plugin implementation of the 'file_generic' widget.

Namespace

Code

protected function formMultipleElements(FieldItemListInterface $items, array &$form, FormStateInterface $form_state) {
    $field_name = $this->fieldDefinition
        ->getName();
    $parents = $form['#parents'];
    // Load the items for form rebuilds from the field state as they might not
    // be in $form_state->getValues() because of validation limitations. Also,
    // they are only passed in as $items when editing existing entities.
    $field_state = static::getWidgetState($parents, $field_name, $form_state);
    if (isset($field_state['items'])) {
        $items->setValue($field_state['items']);
    }
    // Determine the number of widgets to display.
    $cardinality = $this->fieldDefinition
        ->getFieldStorageDefinition()
        ->getCardinality();
    switch ($cardinality) {
        case FieldStorageDefinitionInterface::CARDINALITY_UNLIMITED:
            $max = count($items);
            $is_multiple = TRUE;
            break;
        default:
            $max = $cardinality - 1;
            $is_multiple = $cardinality > 1;
            break;
    }
    $title = $this->fieldDefinition
        ->getLabel();
    $description = $this->getFilteredDescription();
    $elements = [];
    $delta = 0;
    // Add an element for every existing item.
    foreach ($items as $item) {
        $element = [
            '#title' => $title,
            '#description' => $description,
        ];
        $element = $this->formSingleElement($items, $delta, $element, $form, $form_state);
        if ($element) {
            // Input field for the delta (drag-n-drop reordering).
            if ($is_multiple) {
                // We name the element '_weight' to avoid clashing with elements
                // defined by widget.
                $element['_weight'] = [
                    '#type' => 'weight',
                    '#title' => $this->t('Weight for row @number', [
                        '@number' => $delta + 1,
                    ]),
                    '#title_display' => 'invisible',
                    // Note: this 'delta' is the FAPI #type 'weight' element's property.
'#delta' => $max,
                    '#default_value' => $item->_weight ?: $delta,
                    '#weight' => 100,
                ];
            }
            $elements[$delta] = $element;
            $delta++;
        }
    }
    $empty_single_allowed = $cardinality == 1 && $delta == 0;
    $empty_multiple_allowed = ($cardinality == FieldStorageDefinitionInterface::CARDINALITY_UNLIMITED || $delta < $cardinality) && !$form_state->isProgrammed();
    // Add one more empty row for new uploads except when this is a programmed
    // multiple form as it is not necessary.
    if ($empty_single_allowed || $empty_multiple_allowed) {
        // Create a new empty item.
        $items->appendItem();
        $element = [
            '#title' => $title,
            '#description' => $description,
        ];
        $element = $this->formSingleElement($items, $delta, $element, $form, $form_state);
        if ($element) {
            $element['#required'] = $element['#required'] && $delta == 0;
            $elements[$delta] = $element;
        }
    }
    if ($is_multiple) {
        // The group of elements all-together need some extra functionality after
        // building up the full list (like draggable table rows).
        $elements['#file_upload_delta'] = $delta;
        $elements['#type'] = 'details';
        $elements['#open'] = TRUE;
        $elements['#theme'] = 'file_widget_multiple';
        $elements['#theme_wrappers'] = [
            'details',
        ];
        $elements['#process'] = [
            [
                static::class,
                'processMultiple',
            ],
        ];
        $elements['#title'] = $title;
        $elements['#description'] = $description;
        $elements['#field_name'] = $field_name;
        $elements['#language'] = $items->getLangcode();
        // The field settings include defaults for the field type. However, this
        // widget is a base class for other widgets (e.g., ImageWidget) that may
        // act on field types without these expected settings.
        $field_settings = $this->getFieldSettings() + [
            'display_field' => NULL,
        ];
        $elements['#display_field'] = (bool) $field_settings['display_field'];
        // Add some properties that will eventually be added to the file upload
        // field. These are added here so that they may be referenced easily
        // through a hook_form_alter().
        $elements['#file_upload_title'] = $this->t('Add a new file');
        $elements['#file_upload_description'] = [
            '#theme' => 'file_upload_help',
            '#description' => '',
            '#upload_validators' => $elements[0]['#upload_validators'],
            '#cardinality' => $cardinality,
        ];
    }
    return $elements;
}