function block_class_form_block_form_alter in Block Class 8

Implements hook_form_FORM_ID_alter().

File

./block_class.module, line 53

Adding classes to blocks.

Code

function block_class_form_block_form_alter(&$form, FormStateInterface $form_state, $form_id) {
  if (\Drupal::currentUser()
    ->hasPermission('administer block classes')) {
    $form_object = $form_state
      ->getFormObject();
    if ($form_object instanceof EntityFormInterface) {

      /** @var \Drupal\block\BlockInterface $block */
      $block = $form_object
        ->getEntity();

      // This will automatically be saved in the third party settings.
      $form['third_party_settings']['#tree'] = TRUE;
      $form['third_party_settings']['block_class']['classes'] = [
        '#type' => 'textfield',
        '#title' => t('CSS class(es)'),
        '#description' => t('Customize the styling of this block by adding CSS classes. Separate multiple classes by spaces.'),
        '#default_value' => $block
          ->getThirdPartySetting('block_class', 'classes'),
        '#maxlength' => 255,
      ];
    }
  }
}