Index: ios/web_view/test/boolean_observer.mm |
diff --git a/ios/web_view/test/boolean_observer.mm b/ios/web_view/test/boolean_observer.mm |
new file mode 100644 |
index 0000000000000000000000000000000000000000..f1b75b83aa8839ed58a7b610bc966a4e424844f3 |
--- /dev/null |
+++ b/ios/web_view/test/boolean_observer.mm |
@@ -0,0 +1,48 @@ |
+// Copyright 2017 The Chromium Authors. All rights reserved. |
+// Use of this source code is governed by a BSD-style license that can be |
+// found in the LICENSE file. |
+ |
+#import "ios/web_view/test/boolean_observer.h" |
+ |
+#if !defined(__has_feature) || !__has_feature(objc_arc) |
+#error "This file requires ARC support." |
+#endif |
+ |
+@implementation BooleanObserver |
+ |
+@synthesize keyPath = _keyPath; |
+@synthesize lastValue = _lastValue; |
+@synthesize object = _object; |
+ |
+- (void)setObservedObject:(NSObject*)object keyPath:(NSString*)keyPath { |
+ if (_object) { |
Eugene But (OOO till 7-30)
2017/05/23 19:49:33
No need for this check, it's perfectly fine to cal
michaeldo
2017/05/24 15:02:34
Done.
|
+ [_object removeObserver:self forKeyPath:_keyPath]; |
+ } |
+ |
+ _lastValue = NO; |
+ _keyPath = [keyPath copy]; |
+ _object = object; |
+ if (keyPath) { |
Eugene But (OOO till 7-30)
2017/05/23 19:49:33
Is is there a value in passing nil keyPath? Should
michaeldo
2017/05/24 15:02:34
It's the only current way to stop this object from
Eugene But (OOO till 7-30)
2017/05/24 15:32:14
I think if we need API for stopping the observing,
|
+ [_object addObserver:self |
+ forKeyPath:_keyPath |
+ options:NSKeyValueObservingOptionNew |
+ context:nil]; |
+ } |
+} |
+ |
+- (void)observeValueForKeyPath:(NSString*)keyPath |
+ ofObject:(id)object |
+ change:(NSDictionary<NSKeyValueChangeKey, id>*)change |
+ context:(void*)context { |
+ if (object != _object || keyPath != _keyPath) { |
+ // Ignore extraneous call from previous |_object| or |_keyPath|. |
+ return; |
+ } |
+ _lastValue = [change[NSKeyValueChangeNewKey] boolValue]; |
+} |
+ |
+- (void)dealloc { |
+ [_object removeObserver:self forKeyPath:_keyPath]; |
+} |
+ |
+@end |