getThirdPartySetting('block_class', 'classes'))) {
$entity->unsetThirdPartySetting('block_class', 'classes');
}
}
/**
* Implements hook_form_FORM_ID_alter().
*/
function block_class_form_block_form_alter(&$form, FormStateInterface $form_state, $form_id) {
if (\Drupal::currentUser()->hasPermission('administer block classes')) {
/** @var \Drupal\block\BlockInterface $block */
$block = $form_state->getFormObject()->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' => $block->getThirdPartySetting('block_class', 'classes'),
];
}
}
/**
* Implements hook_preprocess_HOOK().
*/
function block_class_preprocess_block(&$variables) {
// Blocks coming from page manager widget does not have id.
if (!empty($variables['elements']['#id'])) {
$block = Block::load($variables['elements']['#id']);
if ($block && $classes = $block->getThirdPartySetting('block_class', 'classes')) {
$classes_array = explode(' ', $classes);
foreach ($classes_array as $class) {
$variables['attributes']['class'][] = Html::cleanCssIdentifier($class, []);
}
}
}
}
/**
* Implements hook_help().
*/
function block_class_help($route_name, RouteMatchInterface $route_match) {
switch ($route_name) {
// Main module help for the forms_to_email module.
case 'help.page.block_class':
$output = '';
$output .= '' . t('About') . '
';
$output .= '' . t("Block Class allows users to add classes to any block through the block's configuration interface. Hooray for more powerful block theming!") . '
';
$output .= '' . t('Installation note') . '
';
$output .= '';
$output .= '- ' . t('Enable the module on extend menu.', [':extend_link' => \Drupal::url('system.modules_list')]) . '
';
$output .= '
';
$output .= '' . t('Usage') . '
';
$output .= '';
$output .= '- ' . t("To add a class to a block, simply visit that block's configuration page at Administration > Structure > Block Layout and click on Configure of the desired block.") . '
';
$output .= '
';
return $output;
}
}