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| 1 // Copyright 2016 The Chromium Authors. All rights reserved. | 1 // Copyright 2016 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 #ifndef MOJO_SERVICES_MEDIA_FACTORY_WATCHED_H_ | 5 #ifndef MOJO_SERVICES_MEDIA_FACTORY_WATCHED_H_ |
| 6 #define MOJO_SERVICES_MEDIA_FACTORY_WATCHED_H_ | 6 #define MOJO_SERVICES_MEDIA_FACTORY_WATCHED_H_ |
| 7 | 7 |
| 8 #include "services/media/factory_service/rule_set.h" | 8 #include "services/media/factory_service/rule_set.h" |
| 9 | 9 |
| 10 namespace mojo { | 10 namespace mojo { |
| 11 namespace media { | 11 namespace media { |
| 12 | 12 |
| 13 // Wraps an object, providing Events that occur when certain criteria are met. | 13 // Wraps an object, providing Events that occur when certain criteria are met. |
| 14 template<typename T> class Watched : public RuleSet { | 14 template <typename T> |
| 15 class Watched : public RuleSet { |
| 15 public: | 16 public: |
| 16 Watched() {} | 17 Watched() {} |
| 17 explicit Watched(T t) : t_(t) {} | 18 explicit Watched(T t) : t_(t) {} |
| 18 | 19 |
| 19 // Returns a Event that will occur when the value of this Watched changes | 20 // Returns a Event that will occur when the value of this Watched changes |
| 20 // to comparand (immediately if they're already equal). | 21 // to comparand (immediately if they're already equal). |
| 21 Event Becomes(const T& comparand) { | 22 Event Becomes(const T& comparand) { |
| 22 return AddRule([this, comparand]() -> bool { | 23 return AddRule([this, comparand]() -> bool { return t_ == comparand; }); |
| 23 return t_ == comparand; | |
| 24 }); | |
| 25 } | 24 } |
| 26 | 25 |
| 27 // Returns a Event that will occur when the value of this Watched changes | 26 // Returns a Event that will occur when the value of this Watched changes |
| 28 // to something other than comparand (immediately if they're already not | 27 // to something other than comparand (immediately if they're already not |
| 29 // equal). | 28 // equal). |
| 30 Event BecomesOtherThan(const T& comparand) { | 29 Event BecomesOtherThan(const T& comparand) { |
| 31 return AddRule([this, comparand]() -> bool { | 30 return AddRule([this, comparand]() -> bool { return t_ != comparand; }); |
| 32 return t_ != comparand; | |
| 33 }); | |
| 34 } | 31 } |
| 35 | 32 |
| 36 void SetWithConsequences(const T& t) { | 33 void SetWithConsequences(const T& t) { |
| 37 t_ = t; | 34 t_ = t; |
| 38 CheckRules(); | 35 CheckRules(); |
| 39 } | 36 } |
| 40 | 37 |
| 41 operator T() { | 38 operator T() { return t_; } |
| 42 return t_; | |
| 43 } | |
| 44 | 39 |
| 45 operator const T&() const { | 40 operator const T&() const { return t_; } |
| 46 return t_; | |
| 47 } | |
| 48 | 41 |
| 49 private: | 42 private: |
| 50 T t_; | 43 T t_; |
| 51 }; | 44 }; |
| 52 | 45 |
| 53 } // namespace media | 46 } // namespace media |
| 54 } // namespace mojo | 47 } // namespace mojo |
| 55 | 48 |
| 56 #endif // MOJO_SERVICES_MEDIA_FACTORY_WATCHED_H_ | 49 #endif // MOJO_SERVICES_MEDIA_FACTORY_WATCHED_H_ |
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