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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 #if !defined(__has_feature) || !__has_feature(objc_arc) |
| 8 #error "This file requires ARC support." |
| 9 #endif |
| 10 |
| 11 @implementation BooleanObserver |
| 12 |
| 13 @synthesize keyPath = _keyPath; |
| 14 @synthesize lastValue = _lastValue; |
| 15 @synthesize object = _object; |
| 16 |
| 17 - (void)setObservedObject:(NSObject*)object keyPath:(NSString*)keyPath { |
| 18 [_object removeObserver:self forKeyPath:_keyPath]; |
| 19 |
| 20 _lastValue = nil; |
| 21 _keyPath = [keyPath copy]; |
| 22 _object = object; |
| 23 if (keyPath) { |
| 24 [_object addObserver:self |
| 25 forKeyPath:_keyPath |
| 26 options:NSKeyValueObservingOptionNew |
| 27 context:nil]; |
| 28 } |
| 29 } |
| 30 |
| 31 - (void)observeValueForKeyPath:(NSString*)keyPath |
| 32 ofObject:(id)object |
| 33 change:(NSDictionary<NSKeyValueChangeKey, id>*)change |
| 34 context:(void*)context { |
| 35 if (![object isEqual:_object] || ![keyPath isEqualToString:_keyPath]) { |
| 36 // Ignore extraneous call from previous |_object| or |_keyPath|. |
| 37 return; |
| 38 } |
| 39 _lastValue = change[NSKeyValueChangeNewKey]; |
| 40 } |
| 41 |
| 42 - (void)dealloc { |
| 43 [_object removeObserver:self forKeyPath:_keyPath]; |
| 44 } |
| 45 |
| 46 @end |
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