Index: base/ios/crb_protocol_observers.h |
diff --git a/base/ios/crb_protocol_observers.h b/base/ios/crb_protocol_observers.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..15d16569ff84660365dceaf4088e2b8c9ecfda34 |
--- /dev/null |
+++ b/base/ios/crb_protocol_observers.h |
@@ -0,0 +1,36 @@ |
+// Copyright 2014 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. |
+ |
+#ifndef BASE_IOS_CRB_PROTOCOL_OBSERVERS_H_ |
+#define BASE_IOS_CRB_PROTOCOL_OBSERVERS_H_ |
+ |
+#import <Foundation/Foundation.h> |
+ |
+typedef void (^ExecutionWithObserverBlock)(id); |
+ |
+// Implements a container for observers that implement a specific Objective-C |
+// protocol. The container forwards method invocations to its contained |
+// observers, so that sending a message to all the observers is as simple as |
+// sending the message to the container. |
+@interface CRBProtocolObservers : NSObject |
+ |
+// The Objective-C protocol that the observers in this container conform to. |
+@property(nonatomic, readonly) Protocol* protocol; |
+ |
+// Returns a CRBProtocolObservers container for observers that conform to |
+// |protocol|. |
++ (CRBProtocolObservers*)observersWithProtocol:(Protocol*)protocol; |
+ |
+// Adds |observer| to this container. |
+- (void)addObserver:(id)observer; |
+ |
+// Remove |observer| from this container. |
+- (void)removeObserver:(id)observer; |
+ |
+// Executes callback on every observer. |callback| cannot be nil. |
+- (void)executeOnObservers:(ExecutionWithObserverBlock)callback; |
+ |
+@end |
+ |
+#endif // BASE_IOS_CRB_PROTOCOL_OBSERVERS_H_ |