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1 // Copyright 2017 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #import "ios/web_view/test/boolean_observer.h" | |
6 | |
7 #include "base/logging.h" | |
8 | |
9 #if !defined(__has_feature) || !__has_feature(objc_arc) | |
10 #error "This file requires ARC support." | |
11 #endif | |
12 | |
13 @implementation BooleanObserver | |
14 | |
15 @synthesize keyPath = _keyPath; | |
16 @synthesize lastValue = _lastValue; | |
17 @synthesize object = _object; | |
18 | |
19 - (void)setObservedObject:(NSObject*)object keyPath:(NSString*)keyPath { | |
20 if (_object) { | |
21 [_object removeObserver:self forKeyPath:_keyPath]; | |
22 } | |
23 | |
24 _lastValue = NO; | |
25 _keyPath = [keyPath copy]; | |
26 _object = object; | |
27 [_object addObserver:self | |
28 forKeyPath:_keyPath | |
29 options:NSKeyValueObservingOptionNew | |
30 context:nil]; | |
31 } | |
32 | |
33 - (void)observeValueForKeyPath:(NSString*)keyPath | |
34 ofObject:(id)object | |
35 change:(NSDictionary<NSKeyValueChangeKey, id>*)change | |
36 context:(void*)context { | |
37 if (object != _object || keyPath != _keyPath) { | |
38 // Ignore extraneous call from previous |_object| or |_keyPath|. | |
39 return; | |
40 } | |
41 | |
42 SEL selector = NSSelectorFromString(keyPath); | |
43 DCHECK([_object respondsToSelector:selector]); | |
44 #pragma clang diagnostic push | |
45 #pragma clang diagnostic ignored "-Warc-performSelector-leaks" | |
46 _lastValue = [object performSelector:selector]; | |
Eugene But (OOO till 7-30)
2017/05/19 18:39:48
Is this something you can get from |change| dictio
michaeldo
2017/05/23 16:20:51
Yes, it is cleaner to get out of |change|. Done.
| |
47 #pragma clang diagnostic pop | |
48 } | |
49 | |
50 - (void)dealloc { | |
51 [_object removeObserver:self forKeyPath:_keyPath]; | |
52 } | |
53 | |
54 @end | |
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