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1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file |
2 // for details. All rights reserved. Use of this source code is governed by a | 2 // for details. All rights reserved. Use of this source code is governed by a |
3 // BSD-style license that can be found in the LICENSE file. | 3 // BSD-style license that can be found in the LICENSE file. |
4 | 4 |
5 library todomvc.test.utils; | 5 library todomvc.test.utils; |
6 | 6 |
7 import 'dart:async'; | 7 import 'dart:async'; |
8 import 'package:observe/observe.dart'; | 8 import 'package:observe/observe.dart'; |
9 | 9 |
10 Future onPropertyInit(Observable obj, String path) { | 10 Future onPropertyInit(Observable obj, String path) { |
11 final obs = new PathObserver(obj, path); | 11 final obs = new PathObserver(obj, path); |
12 if (obs.value != null) return new Future.value(obs.value); | 12 if (obs.value != null) return new Future.value(obs.value); |
13 | 13 |
14 final c = new Completer(); | 14 final c = new Completer(); |
15 StreamSubscription sub; | 15 obs.open((value) { |
16 sub = obs.changes.listen((_) { | 16 if (value != null) { |
17 if (obs.value != null) { | 17 obs.close(); |
18 sub.cancel(); | 18 c.complete(value); |
19 c.complete(obs.value); | |
20 } | 19 } |
21 }); | 20 }); |
22 return c.future; | 21 return c.future; |
23 } | 22 } |
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