| // Copyright (c) 2018, the Dart project authors. Please see the AUTHORS file | |
| // for details. All rights reserved. Use of this source code is governed by a | |
| // BSD-style license that can be found in the LICENSE file. | |
| typedef void RecognizerCallback<T>(); | |
| typedef void GestureTapCancelCallback(); | |
| GestureTapCancelCallback? onTapCancel; | |
| T? invokeCallback<T>(String name, RecognizerCallback<T>? callback, | |
| {String debugReport()?}) {} | |
| main() { | |
| invokeCallback<void>('spontaneous onTapCancel', onTapCancel); | |
| } |