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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 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 | 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 // A helper class that stays in sync with a preference (bool, int, real, | 5 // A helper class that stays in sync with a preference (bool, int, real, |
6 // string or filepath). For example: | 6 // string or filepath). For example: |
7 // | 7 // |
8 // class MyClass { | 8 // class MyClass { |
9 // public: | 9 // public: |
10 // MyClass(PrefService* prefs) { | 10 // MyClass(PrefService* prefs) { |
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264 virtual BASE_PREFS_EXPORT bool UpdateValueInternal( | 264 virtual BASE_PREFS_EXPORT bool UpdateValueInternal( |
265 const base::Value& value) const OVERRIDE; | 265 const base::Value& value) const OVERRIDE; |
266 | 266 |
267 // We cache the value of the pref so we don't have to keep walking the pref | 267 // We cache the value of the pref so we don't have to keep walking the pref |
268 // tree. | 268 // tree. |
269 mutable ValueType value_; | 269 mutable ValueType value_; |
270 | 270 |
271 DISALLOW_COPY_AND_ASSIGN(Internal); | 271 DISALLOW_COPY_AND_ASSIGN(Internal); |
272 }; | 272 }; |
273 | 273 |
274 virtual Internal* internal() const OVERRIDE { return internal_; } | 274 virtual Internal* internal() const OVERRIDE { return internal_.get(); } |
275 virtual void CreateInternal() const OVERRIDE { | 275 virtual void CreateInternal() const OVERRIDE { internal_ = new Internal(); } |
276 internal_ = new Internal(); | |
277 } | |
278 | 276 |
279 // This method is used to do the actual sync with pref of the specified type. | 277 // This method is used to do the actual sync with pref of the specified type. |
280 void BASE_PREFS_EXPORT UpdatePref(const ValueType& value); | 278 void BASE_PREFS_EXPORT UpdatePref(const ValueType& value); |
281 | 279 |
282 mutable scoped_refptr<Internal> internal_; | 280 mutable scoped_refptr<Internal> internal_; |
283 | 281 |
284 DISALLOW_COPY_AND_ASSIGN(PrefMember); | 282 DISALLOW_COPY_AND_ASSIGN(PrefMember); |
285 }; | 283 }; |
286 | 284 |
287 // Declaration of template specialization need to be repeated here | 285 // Declaration of template specialization need to be repeated here |
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345 | 343 |
346 typedef PrefMember<bool> BooleanPrefMember; | 344 typedef PrefMember<bool> BooleanPrefMember; |
347 typedef PrefMember<int> IntegerPrefMember; | 345 typedef PrefMember<int> IntegerPrefMember; |
348 typedef PrefMember<double> DoublePrefMember; | 346 typedef PrefMember<double> DoublePrefMember; |
349 typedef PrefMember<std::string> StringPrefMember; | 347 typedef PrefMember<std::string> StringPrefMember; |
350 typedef PrefMember<base::FilePath> FilePathPrefMember; | 348 typedef PrefMember<base::FilePath> FilePathPrefMember; |
351 // This preference member is expensive for large string arrays. | 349 // This preference member is expensive for large string arrays. |
352 typedef PrefMember<std::vector<std::string> > StringListPrefMember; | 350 typedef PrefMember<std::vector<std::string> > StringListPrefMember; |
353 | 351 |
354 #endif // BASE_PREFS_PREF_MEMBER_H_ | 352 #endif // BASE_PREFS_PREF_MEMBER_H_ |
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