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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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109 | 109 |
110 virtual void CreateInternal() const = 0; | 110 virtual void CreateInternal() const = 0; |
111 | 111 |
112 // See PrefMember<> for description. | 112 // See PrefMember<> for description. |
113 void Destroy(); | 113 void Destroy(); |
114 | 114 |
115 void MoveToThread( | 115 void MoveToThread( |
116 const scoped_refptr<base::SingleThreadTaskRunner>& task_runner); | 116 const scoped_refptr<base::SingleThreadTaskRunner>& task_runner); |
117 | 117 |
118 // PrefObserver | 118 // PrefObserver |
119 virtual void OnPreferenceChanged(PrefService* service, | 119 void OnPreferenceChanged(PrefService* service, |
120 const std::string& pref_name) OVERRIDE; | 120 const std::string& pref_name) override; |
121 | 121 |
122 void VerifyValuePrefName() const { | 122 void VerifyValuePrefName() const { |
123 DCHECK(!pref_name_.empty()); | 123 DCHECK(!pref_name_.empty()); |
124 } | 124 } |
125 | 125 |
126 // This method is used to do the actual sync with the preference. | 126 // This method is used to do the actual sync with the preference. |
127 // Note: it is logically const, because it doesn't modify the state | 127 // Note: it is logically const, because it doesn't modify the state |
128 // seen by the outside world. It is just doing a lazy load behind the scenes. | 128 // seen by the outside world. It is just doing a lazy load behind the scenes. |
129 void UpdateValueFromPref(const base::Closure& callback) const; | 129 void UpdateValueFromPref(const base::Closure& callback) const; |
130 | 130 |
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256 Internal() : value_(ValueType()) {} | 256 Internal() : value_(ValueType()) {} |
257 | 257 |
258 ValueType value() { | 258 ValueType value() { |
259 CheckOnCorrectThread(); | 259 CheckOnCorrectThread(); |
260 return value_; | 260 return value_; |
261 } | 261 } |
262 | 262 |
263 protected: | 263 protected: |
264 virtual ~Internal() {} | 264 virtual ~Internal() {} |
265 | 265 |
266 virtual BASE_PREFS_EXPORT bool UpdateValueInternal( | 266 BASE_PREFS_EXPORT bool UpdateValueInternal( |
267 const base::Value& value) const OVERRIDE; | 267 const base::Value& value) const override; |
268 | 268 |
269 // We cache the value of the pref so we don't have to keep walking the pref | 269 // We cache the value of the pref so we don't have to keep walking the pref |
270 // tree. | 270 // tree. |
271 mutable ValueType value_; | 271 mutable ValueType value_; |
272 | 272 |
273 DISALLOW_COPY_AND_ASSIGN(Internal); | 273 DISALLOW_COPY_AND_ASSIGN(Internal); |
274 }; | 274 }; |
275 | 275 |
276 virtual Internal* internal() const OVERRIDE { return internal_.get(); } | 276 Internal* internal() const override { return internal_.get(); } |
277 virtual void CreateInternal() const OVERRIDE { internal_ = new Internal(); } | 277 void CreateInternal() const override { internal_ = new Internal(); } |
278 | 278 |
279 // This method is used to do the actual sync with pref of the specified type. | 279 // This method is used to do the actual sync with pref of the specified type. |
280 void BASE_PREFS_EXPORT UpdatePref(const ValueType& value); | 280 void BASE_PREFS_EXPORT UpdatePref(const ValueType& value); |
281 | 281 |
282 mutable scoped_refptr<Internal> internal_; | 282 mutable scoped_refptr<Internal> internal_; |
283 | 283 |
284 DISALLOW_COPY_AND_ASSIGN(PrefMember); | 284 DISALLOW_COPY_AND_ASSIGN(PrefMember); |
285 }; | 285 }; |
286 | 286 |
287 // Declaration of template specialization need to be repeated here | 287 // Declaration of template specialization need to be repeated here |
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345 | 345 |
346 typedef PrefMember<bool> BooleanPrefMember; | 346 typedef PrefMember<bool> BooleanPrefMember; |
347 typedef PrefMember<int> IntegerPrefMember; | 347 typedef PrefMember<int> IntegerPrefMember; |
348 typedef PrefMember<double> DoublePrefMember; | 348 typedef PrefMember<double> DoublePrefMember; |
349 typedef PrefMember<std::string> StringPrefMember; | 349 typedef PrefMember<std::string> StringPrefMember; |
350 typedef PrefMember<base::FilePath> FilePathPrefMember; | 350 typedef PrefMember<base::FilePath> FilePathPrefMember; |
351 // This preference member is expensive for large string arrays. | 351 // This preference member is expensive for large string arrays. |
352 typedef PrefMember<std::vector<std::string> > StringListPrefMember; | 352 typedef PrefMember<std::vector<std::string> > StringListPrefMember; |
353 | 353 |
354 #endif // BASE_PREFS_PREF_MEMBER_H_ | 354 #endif // BASE_PREFS_PREF_MEMBER_H_ |
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