Carbon_Fields\Widget\Widget::form PHP Method

    public function form($instance)
    {
        $this->store_data = $instance;
        $custom_fields = array();
        foreach ($this->custom_fields as $field) {
            $tmp_field = clone $field;
            $tmp_field->load();
            $field_name = $this->get_field_name($tmp_field->get_name());
            $tmp_field->set_name($field_name);
            $custom_fields[] = $tmp_field;
        }
        Container::factory('widget', $this->id)->add_fields($custom_fields)->init();
    }