function ImageWidget::process

Form API callback: Processes a image_image field element.

Expands the image_image type to include the alt and title fields.

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

Overrides FileWidget::process

File

core/modules/image/src/Plugin/Field/FieldWidget/ImageWidget.php, line 195

Class

ImageWidget

Plugin implementation of the 'image_image' widget.

Namespace

Code

public static function process($element, FormStateInterface $form_state, $form) {
    $item = $element['#value'];
    $item['fids'] = $element['fids']['#value'];
    $element['#theme'] = 'image_widget';
    // Add the image preview.
    if (!empty($element['#files']) && $element['#preview_image_style']) {
        $file = reset($element['#files']);
        $variables = [
            'style_name' => $element['#preview_image_style'],
            'uri' => $file->getFileUri(),
        ];
        $dimension_key = $variables['uri'] . '.image_preview_dimensions';
        // Determine image dimensions.
        if (isset($element['#value']['width']) && isset($element['#value']['height'])) {
            $variables['width'] = $element['#value']['width'];
            $variables['height'] = $element['#value']['height'];
        }
        elseif ($form_state->has($dimension_key)) {
            $variables += $form_state->get($dimension_key);
        }
        else {
            $image = \Drupal::service('image.factory')->get($file->getFileUri());
            if ($image->isValid()) {
                $variables['width'] = $image->getWidth();
                $variables['height'] = $image->getHeight();
            }
            else {
                $variables['width'] = $variables['height'] = NULL;
            }
        }
        $element['preview'] = [
            '#weight' => -10,
            '#theme' => 'image_style',
            '#width' => $variables['width'],
            '#height' => $variables['height'],
            '#style_name' => $variables['style_name'],
            '#uri' => $variables['uri'],
        ];
        // Store the dimensions in the form so the file doesn't have to be
        // accessed again. This is important for remote files.
        $form_state->set($dimension_key, [
            'width' => $variables['width'],
            'height' => $variables['height'],
        ]);
    }
    elseif (!empty($element['#default_image'])) {
        $default_image = $element['#default_image'];
        $file = File::load($default_image['fid']);
        if (!empty($file)) {
            $element['preview'] = [
                '#weight' => -10,
                '#theme' => 'image_style',
                '#width' => $default_image['width'],
                '#height' => $default_image['height'],
                '#style_name' => $element['#preview_image_style'],
                '#uri' => $file->getFileUri(),
            ];
        }
    }
    // Add the additional alt and title fields.
    $element['alt'] = [
        '#title' => t('Alternative text'),
        '#type' => 'textfield',
        '#default_value' => isset($item['alt']) ? $item['alt'] : '',
        '#description' => t('Short description of the image used by screen readers and displayed when the image is not loaded. This is important for accessibility.'),
        // @see https://www.drupal.org/node/465106#alt-text
'#maxlength' => 512,
        '#weight' => -12,
        '#access' => (bool) $item['fids'] && $element['#alt_field'],
        '#required' => $element['#alt_field_required'],
        '#element_validate' => $element['#alt_field_required'] == 1 ? [
            [
                get_called_class(),
                'validateRequiredFields',
            ],
        ] : [],
    ];
    $element['title'] = [
        '#type' => 'textfield',
        '#title' => t('Title'),
        '#default_value' => isset($item['title']) ? $item['title'] : '',
        '#description' => t('The title is used as a tool tip when the user hovers the mouse over the image.'),
        '#maxlength' => 1024,
        '#weight' => -11,
        '#access' => (bool) $item['fids'] && $element['#title_field'],
        '#required' => $element['#title_field_required'],
        '#element_validate' => $element['#title_field_required'] == 1 ? [
            [
                get_called_class(),
                'validateRequiredFields',
            ],
        ] : [],
    ];
    return parent::process($element, $form_state, $form);
}