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| 1 // Copyright (c) 2010 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2010 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 #ifndef CONTENT_COMMON_NOTIFICATION_REGISTRAR_H_ | 5 #ifndef CONTENT_COMMON_NOTIFICATION_REGISTRAR_H_ |
| 6 #define CONTENT_COMMON_NOTIFICATION_REGISTRAR_H_ | 6 #define CONTENT_COMMON_NOTIFICATION_REGISTRAR_H_ |
| 7 #pragma once | 7 #pragma once |
| 8 | 8 |
| 9 #include <vector> | 9 #include <vector> |
| 10 | 10 |
| 11 #include "base/basictypes.h" | 11 #include "base/basictypes.h" |
| 12 #include "content/common/notification_type.h" | 12 #include "content/common/content_notification_types.h" |
| 13 | 13 |
| 14 class NotificationObserver; | 14 class NotificationObserver; |
| 15 class NotificationSource; | 15 class NotificationSource; |
| 16 | 16 |
| 17 // Aids in registering for notifications and ensures that all registered | 17 // Aids in registering for notifications and ensures that all registered |
| 18 // notifications are unregistered when the class is destroyed. | 18 // notifications are unregistered when the class is destroyed. |
| 19 // | 19 // |
| 20 // The intended use is that you make a NotificationRegistrar member in your | 20 // The intended use is that you make a NotificationRegistrar member in your |
| 21 // class and use it to register your notifications instead of going through the | 21 // class and use it to register your notifications instead of going through the |
| 22 // notification service directly. It will automatically unregister them for | 22 // notification service directly. It will automatically unregister them for |
| 23 // you. | 23 // you. |
| 24 class NotificationRegistrar { | 24 class NotificationRegistrar { |
| 25 public: | 25 public: |
| 26 // This class must not be derived from (we don't have a virtual destructor so | 26 // This class must not be derived from (we don't have a virtual destructor so |
| 27 // it won't work). Instead, use it as a member in your class. | 27 // it won't work). Instead, use it as a member in your class. |
| 28 NotificationRegistrar(); | 28 NotificationRegistrar(); |
| 29 ~NotificationRegistrar(); | 29 ~NotificationRegistrar(); |
| 30 | 30 |
| 31 // Wrappers around NotificationService::[Add|Remove]Observer. | 31 // Wrappers around NotificationService::[Add|Remove]Observer. |
| 32 void Add(NotificationObserver* observer, | 32 void Add(NotificationObserver* observer, |
| 33 NotificationType type, | 33 int type, |
| 34 const NotificationSource& source); | 34 const NotificationSource& source); |
| 35 void Remove(NotificationObserver* observer, | 35 void Remove(NotificationObserver* observer, |
| 36 NotificationType type, | 36 int type, |
| 37 const NotificationSource& source); | 37 const NotificationSource& source); |
| 38 | 38 |
| 39 // Unregisters all notifications. | 39 // Unregisters all notifications. |
| 40 void RemoveAll(); | 40 void RemoveAll(); |
| 41 | 41 |
| 42 // Returns true if no notifications are registered. | 42 // Returns true if no notifications are registered. |
| 43 bool IsEmpty() const; | 43 bool IsEmpty() const; |
| 44 | 44 |
| 45 // Returns true if there is already a registered notification with the | 45 // Returns true if there is already a registered notification with the |
| 46 // specified details. | 46 // specified details. |
| 47 bool IsRegistered(NotificationObserver* observer, | 47 bool IsRegistered(NotificationObserver* observer, |
| 48 NotificationType type, | 48 int type, |
| 49 const NotificationSource& source); | 49 const NotificationSource& source); |
| 50 | 50 |
| 51 private: | 51 private: |
| 52 struct Record; | 52 struct Record; |
| 53 | 53 |
| 54 // We keep registered notifications in a simple vector. This means we'll do | 54 // We keep registered notifications in a simple vector. This means we'll do |
| 55 // brute-force searches when removing them individually, but individual | 55 // brute-force searches when removing them individually, but individual |
| 56 // removal is uncommon, and there will typically only be a couple of | 56 // removal is uncommon, and there will typically only be a couple of |
| 57 // notifications anyway. | 57 // notifications anyway. |
| 58 typedef std::vector<Record> RecordVector; | 58 typedef std::vector<Record> RecordVector; |
| 59 | 59 |
| 60 // Lists all notifications we're currently registered for. | 60 // Lists all notifications we're currently registered for. |
| 61 RecordVector registered_; | 61 RecordVector registered_; |
| 62 | 62 |
| 63 DISALLOW_COPY_AND_ASSIGN(NotificationRegistrar); | 63 DISALLOW_COPY_AND_ASSIGN(NotificationRegistrar); |
| 64 }; | 64 }; |
| 65 | 65 |
| 66 #endif // CONTENT_COMMON_NOTIFICATION_REGISTRAR_H_ | 66 #endif // CONTENT_COMMON_NOTIFICATION_REGISTRAR_H_ |
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