public function customers_list() { $screen = isset($_GET['screen']) ? $_GET['screen'] : ''; switch ($screen) { case 'customer_notes': WC_CRM_Screen_Customers_Edit::display_notes($_GET['c_id']); break; case 'order_list': WC_CRM_Screen_Customers_Edit::display_order_list($_GET['c_id']); break; case 'product_list': WC_CRM_Screen_Customers_Edit::display_products_list($_GET['c_id']); break; case 'email': WC_CRM_Screen_Activity::display_email_form(); break; case 'phone_call': WC_CRM_Screen_Activity::display_phone_call_form(); break; default: if (isset($_GET['c_id']) && !empty($_GET['c_id'])) { WC_CRM_Screen_Customers_Edit::output($_GET['c_id']); } else { WC_CRM_Screen_Customers_List::output(); } break; } }