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| 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 | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #ifndef BASE_PREFS_PUBLIC_PREF_CHANGE_REGISTRAR_H_ | |
| 6 #define BASE_PREFS_PUBLIC_PREF_CHANGE_REGISTRAR_H_ | |
| 7 | |
| 8 #include <map> | |
| 9 #include <string> | |
| 10 | |
| 11 #include "base/basictypes.h" | |
| 12 #include "base/callback.h" | |
| 13 #include "base/prefs/base_prefs_export.h" | |
| 14 #include "base/prefs/pref_observer.h" | |
| 15 | |
| 16 class PrefService; | |
| 17 | |
| 18 // Automatically manages the registration of one or more pref change observers | |
| 19 // with a PrefStore. Functions much like NotificationRegistrar, but specifically | |
| 20 // manages observers of preference changes. When the Registrar is destroyed, | |
| 21 // all registered observers are automatically unregistered with the PrefStore. | |
| 22 class BASE_PREFS_EXPORT PrefChangeRegistrar : public PrefObserver { | |
| 23 public: | |
| 24 // You can register this type of callback if you need to know the | |
| 25 // path of the preference that is changing. | |
| 26 typedef base::Callback<void(const std::string&)> NamedChangeCallback; | |
| 27 | |
| 28 PrefChangeRegistrar(); | |
| 29 virtual ~PrefChangeRegistrar(); | |
| 30 | |
| 31 // Must be called before adding or removing observers. Can be called more | |
| 32 // than once as long as the value of |service| doesn't change. | |
| 33 void Init(PrefService* service); | |
| 34 | |
| 35 // Adds a pref observer for the specified pref |path| and |obs| observer | |
| 36 // object. All registered observers will be automatically unregistered | |
| 37 // when the registrar's destructor is called. | |
| 38 // | |
| 39 // The second version binds a callback that will receive the path of | |
| 40 // the preference that is changing as its parameter. | |
| 41 // | |
| 42 // Only one observer may be registered per path. | |
| 43 void Add(const char* path, const base::Closure& obs); | |
| 44 void Add(const char* path, const NamedChangeCallback& obs); | |
| 45 | |
| 46 // Removes the pref observer registered for |path|. | |
| 47 void Remove(const char* path); | |
| 48 | |
| 49 // Removes all observers that have been previously added with a call to Add. | |
| 50 void RemoveAll(); | |
| 51 | |
| 52 // Returns true if no pref observers are registered. | |
| 53 bool IsEmpty() const; | |
| 54 | |
| 55 // Check whether |pref| is in the set of preferences being observed. | |
| 56 bool IsObserved(const std::string& pref); | |
| 57 | |
| 58 // Check whether any of the observed preferences has the managed bit set. | |
| 59 bool IsManaged(); | |
| 60 | |
| 61 // Return the PrefService for this registrar. | |
| 62 PrefService* prefs(); | |
| 63 | |
| 64 private: | |
| 65 // PrefObserver: | |
| 66 virtual void OnPreferenceChanged(PrefService* service, | |
| 67 const std::string& pref_name) OVERRIDE; | |
| 68 | |
| 69 static void InvokeUnnamedCallback(const base::Closure& callback, | |
| 70 const std::string& pref_name); | |
| 71 | |
| 72 typedef std::map<std::string, NamedChangeCallback> ObserverMap; | |
| 73 | |
| 74 ObserverMap observers_; | |
| 75 PrefService* service_; | |
| 76 | |
| 77 DISALLOW_COPY_AND_ASSIGN(PrefChangeRegistrar); | |
| 78 }; | |
| 79 | |
| 80 #endif // BASE_PREFS_PUBLIC_PREF_CHANGE_REGISTRAR_H_ | |
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Chromium Code Reviews
Issue 12789006:
base/prefs: Remove the public/ directory and move the files to //base/prefs. (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src