private function register_default_sources()
{
include ELEMENTOR_PATH . 'includes/template-library/classes/class-import-images.php';
include ELEMENTOR_PATH . 'includes/template-library/sources/base.php';
$sources = ['local', 'remote'];
foreach ($sources as $source_filename) {
include ELEMENTOR_PATH . 'includes/template-library/sources/' . $source_filename . '.php';
$class_name = ucwords($source_filename);
$class_name = str_replace('-', '_', $class_name);
$this->register_source(__NAMESPACE__ . '\\Source_' . $class_name);
}
}