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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 part of observe; | 5 part of observe; |
6 | 6 |
7 /** | 7 /** |
8 * Forwards an observable property from one object to another. For example: | 8 * Forwards an observable property from one object to another. For example: |
9 * | 9 * |
10 * class MyModel extends ObservableBase { | 10 * class MyModel extends ObservableBase { |
11 * StreamSubscription _sub; | 11 * StreamSubscription _sub; |
12 * MyOtherModel _otherModel; | 12 * MyOtherModel _otherModel; |
13 * | 13 * |
14 * MyModel() { | 14 * MyModel() { |
15 * ... | 15 * ... |
16 * _sub = bindProperty(_otherModel, const Symbol('value'), | 16 * _sub = onPropertyChange(_otherModel, const Symbol('value'), |
17 * () => notifyProperty(this, const Symbol('prop')); | 17 * () => notifyProperty(this, const Symbol('prop')); |
18 * } | 18 * } |
19 * | 19 * |
20 * String get prop => _otherModel.value; | 20 * String get prop => _otherModel.value; |
21 * set prop(String value) { _otherModel.value = value; } | 21 * set prop(String value) { _otherModel.value = value; } |
22 * } | 22 * } |
23 * | 23 * |
24 * See also [notifyProperty]. | 24 * See also [notifyProperty]. |
25 */ | 25 */ |
26 StreamSubscription bindProperty(Observable source, Symbol sourceName, | 26 // TODO(jmesserly): make this an instance method? |
27 StreamSubscription onPropertyChange(Observable source, Symbol sourceName, | |
27 void callback()) { | 28 void callback()) { |
blois
2013/09/27 21:40:52
Not related to this change, but I'm curious why th
Jennifer Messerly
2013/09/30 17:44:37
Great question. This method is just a shorthand fo
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28 return source.changes.listen((records) { | 29 return source.changes.listen((records) { |
29 for (var record in records) { | 30 for (var record in records) { |
30 if (record.changes(sourceName)) { | 31 if (record.changes(sourceName)) { |
31 callback(); | 32 callback(); |
32 } | 33 } |
33 } | 34 } |
34 }); | 35 }); |
35 } | 36 } |
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