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| 1 // Copyright (c) 2012 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 #ifndef CHROME_BROWSER_PREFS_PREF_REGISTRY_H_ |
| 6 #define CHROME_BROWSER_PREFS_PREF_REGISTRY_H_ |
| 7 |
| 8 #include "base/callback.h" |
| 9 #include "base/memory/ref_counted.h" |
| 10 #include "base/prefs/pref_value_map.h" |
| 11 |
| 12 namespace base { |
| 13 class Value; |
| 14 } |
| 15 |
| 16 class DefaultPrefStore; |
| 17 class PrefStore; |
| 18 |
| 19 // Preferences need to be registered with a type and default value |
| 20 // before they are used. |
| 21 // |
| 22 // The way you use a PrefRegistry is that you register all required |
| 23 // preferences on it (via one of its subclasses), then pass it as a |
| 24 // construction parameter to PrefService. |
| 25 // |
| 26 // Currently, registrations after constructing the PrefService will |
| 27 // also work, but this is being deprecated. |
| 28 class PrefRegistry : public base::RefCounted<PrefRegistry> { |
| 29 public: |
| 30 typedef PrefValueMap::const_iterator const_iterator; |
| 31 typedef base::Callback<void(const char*, base::Value*)> RegistrationCallback; |
| 32 typedef base::Callback<void(const char*)> UnregistrationCallback; |
| 33 |
| 34 PrefRegistry(); |
| 35 |
| 36 // Gets the registered defaults. |
| 37 scoped_refptr<PrefStore> defaults(); |
| 38 |
| 39 // Allows iteration over defaults. |
| 40 const_iterator begin() const; |
| 41 const_iterator end() const; |
| 42 |
| 43 // Exactly one callback can be set for each of two events: |
| 44 // Registration and unregistration. If either is set, the callback |
| 45 // will be invoked each time registration and/or unregistration has |
| 46 // been performed on this object. |
| 47 // |
| 48 // Calling either of these methods after a callback has already been |
| 49 // set will make the object forget the previous callback and use the |
| 50 // new one instead. |
| 51 void SetRegistrationCallback(const RegistrationCallback& callback); |
| 52 void SetUnregistrationCallback(const UnregistrationCallback& callback); |
| 53 |
| 54 // Unregisters a preference. This is going away soon. |
| 55 virtual void DeprecatedUnregisterPreference(const char* path); |
| 56 |
| 57 protected: |
| 58 friend class base::RefCounted<PrefRegistry>; |
| 59 virtual ~PrefRegistry(); |
| 60 |
| 61 // TODO(joi): Temporary until we have PrefRegistrySyncable. |
| 62 friend class PrefServiceSyncable; |
| 63 |
| 64 // Used by subclasses to register a default value for a preference. |
| 65 void RegisterPreference(const char* path, base::Value* default_value); |
| 66 |
| 67 private: |
| 68 RegistrationCallback registration_callback_; |
| 69 UnregistrationCallback unregistration_callback_; |
| 70 scoped_refptr<DefaultPrefStore> defaults_; |
| 71 |
| 72 DISALLOW_COPY_AND_ASSIGN(PrefRegistry); |
| 73 }; |
| 74 |
| 75 #endif // CHROME_BROWSER_PREFS_PREF_REGISTRY_H_ |
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