method getEventHandler

Source

EventListener getEventHandler(controller, target, String method) => (e) {
  if (controller == null || controller is! Polymer) {
    controller = findController(target);
  }

  if (controller is Polymer) {
    var detail = null;
    if (e is CustomEvent) {
      detail = e.detail;
      // TODO(sigmund): this shouldn't be necessary. See issue 19315.
      if (detail == null) {
        detail = new JsObject.fromBrowserObject(e)['detail'];
      }
    }
    var args = [e, detail, e.currentTarget];
    controller.dispatchMethod(controller, method, args);
  } else {
    throw new StateError('controller $controller is not a '
        'Dart polymer-element.');
  }
};