components: Extract pref_registry component out of user_prefs.

components/user_prefs/pref_registry_syncable.h

-// Copyright (c) 2012 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 COMPONENTS_USER_PREFS_PREF_REGISTRY_SYNCABLE_H_
-#define COMPONENTS_USER_PREFS_PREF_REGISTRY_SYNCABLE_H_
-
-#include <set>
-#include <string>
-
-#include "base/callback.h"
-#include "base/prefs/pref_registry.h"
-#include "components/user_prefs/user_prefs_export.h"
-
-namespace base {
-class DictionaryValue;
-class FilePath;
-class ListValue;
-class Value;
-}
-
-namespace user_prefs {
-
-// A PrefRegistry that forces users to choose whether each registered
-// preference is syncable or not.
-//
-// Classes or components that want to register such preferences should
-// define a static function named RegisterUserPrefs that takes a
-// PrefRegistrySyncable*, and the top-level application using the
-// class or embedding the component should call this function at an
-// appropriate time before the PrefService for these preferences is
-// constructed. See e.g. chrome/browser/prefs/browser_prefs.cc which
-// does this for Chrome.
-class USER_PREFS_EXPORT PrefRegistrySyncable : public PrefRegistry {
- public:
-  // Enum used when registering preferences to determine if it should
-  // be synced or not. Syncable priority preferences are preferences that are
-  // never encrypted and are synced before other datatypes. Because they're
-  // never encrypted, on first sync, they can be synced down before the user
-  // is prompted for a passphrase.
-  enum PrefSyncStatus {
-    UNSYNCABLE_PREF,
-    SYNCABLE_PREF,
-    SYNCABLE_PRIORITY_PREF,
-  };
-
-  typedef
-      base::Callback<void(const char* path, const PrefSyncStatus sync_status)>
-          SyncableRegistrationCallback;
-
-  PrefRegistrySyncable();
-
-  typedef std::map<std::string, PrefSyncStatus> PrefToStatus;
-
-  // Retrieve the set of syncable preferences currently registered.
-  const PrefToStatus& syncable_preferences() const;
-
-  // Exactly one callback can be set for the event of a syncable
-  // preference being registered. It will be fired after the
-  // registration has occurred.
-  //
-  // Calling this method after a callback has already been set will
-  // make the object forget the previous callback and use the new one
-  // instead.
-  void SetSyncableRegistrationCallback(const SyncableRegistrationCallback& cb);
-
-  void RegisterBooleanPref(const char* path,
-                           bool default_value,
-                           PrefSyncStatus sync_status);
-  void RegisterIntegerPref(const char* path,
-                           int default_value,
-                           PrefSyncStatus sync_status);
-  void RegisterDoublePref(const char* path,
-                          double default_value,
-                          PrefSyncStatus sync_status);
-  void RegisterStringPref(const char* path,
-                          const std::string& default_value,
-                          PrefSyncStatus sync_status);
-  void RegisterFilePathPref(const char* path,
-                            const base::FilePath& default_value,
-                            PrefSyncStatus sync_status);
-  void RegisterListPref(const char* path,
-                        PrefSyncStatus sync_status);
-  void RegisterDictionaryPref(const char* path,
-                              PrefSyncStatus sync_status);
-  void RegisterListPref(const char* path,
-                        base::ListValue* default_value,
-                        PrefSyncStatus sync_status);
-  void RegisterDictionaryPref(const char* path,
-                              base::DictionaryValue* default_value,
-                              PrefSyncStatus sync_status);
-  void RegisterLocalizedBooleanPref(const char* path,
-                                    int locale_default_message_id,
-                                    PrefSyncStatus sync_status);
-  void RegisterLocalizedIntegerPref(const char* path,
-                                    int locale_default_message_id,
-                                    PrefSyncStatus sync_status);
-  void RegisterLocalizedDoublePref(const char* path,
-                                   int locale_default_message_id,
-                                   PrefSyncStatus sync_status);
-  void RegisterLocalizedStringPref(const char* path,
-                                   int locale_default_message_id,
-                                   PrefSyncStatus sync_status);
-  void RegisterInt64Pref(const char* path,
-                         int64 default_value,
-                         PrefSyncStatus sync_status);
-  void RegisterUint64Pref(const char* path,
-                          uint64 default_value,
-                          PrefSyncStatus sync_status);
-
-  // Returns a new PrefRegistrySyncable that uses the same defaults
-  // store.
-  scoped_refptr<PrefRegistrySyncable> ForkForIncognito();
-
- private:
-  virtual ~PrefRegistrySyncable();
-
-  void RegisterSyncablePreference(const char* path,
-                                  base::Value* default_value,
-                                  PrefSyncStatus sync_status);
-
-  SyncableRegistrationCallback callback_;
-
-  // Contains the names of all registered preferences that are syncable.
-  PrefToStatus syncable_preferences_;
-
-  DISALLOW_COPY_AND_ASSIGN(PrefRegistrySyncable);
-};
-
-}  // namespace user_prefs
-
-#endif  // COMPONENTS_USER_PREFS_PREF_REGISTRY_SYNCABLE_H_