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| 1 // Copyright 2015 The Chromium Authors. All rights reserved. | 1 // Copyright 2015 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 CONTENT_CHILD_SCOPED_WEB_CALLBACKS_H_ | 5 #ifndef CONTENT_CHILD_SCOPED_WEB_CALLBACKS_H_ |
| 6 #define CONTENT_CHILD_SCOPED_WEB_CALLBACKS_H_ | 6 #define CONTENT_CHILD_SCOPED_WEB_CALLBACKS_H_ |
| 7 | 7 |
| 8 #include "base/callback.h" | 8 #include "base/callback.h" |
| 9 #include "base/memory/scoped_ptr.h" | 9 #include "base/memory/scoped_ptr.h" |
| 10 #include "base/move.h" | 10 #include "base/move.h" |
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| 57 // | 57 // |
| 58 // If the bound RespondWithSuccess callback actually runs, PassCallbacks() will | 58 // If the bound RespondWithSuccess callback actually runs, PassCallbacks() will |
| 59 // reliquish ownership of the WebCallbacks object to a temporary scoped_ptr | 59 // reliquish ownership of the WebCallbacks object to a temporary scoped_ptr |
| 60 // which will be destroyed immediately after onSuccess is called. | 60 // which will be destroyed immediately after onSuccess is called. |
| 61 // | 61 // |
| 62 // If the bound RespondWithSuccess callback is instead destroyed first, | 62 // If the bound RespondWithSuccess callback is instead destroyed first, |
| 63 // the ScopedWebCallbacks destructor will invoke OnCallbacksDropped, executing | 63 // the ScopedWebCallbacks destructor will invoke OnCallbacksDropped, executing |
| 64 // our desired default behavior before deleting the WebCallbacks. | 64 // our desired default behavior before deleting the WebCallbacks. |
| 65 template <typename CallbacksType> | 65 template <typename CallbacksType> |
| 66 class ScopedWebCallbacks { | 66 class ScopedWebCallbacks { |
| 67 MOVE_ONLY_TYPE_FOR_CPP_03(ScopedWebCallbacks, RValue); | 67 MOVE_ONLY_TYPE_FOR_CPP_03(ScopedWebCallbacks); |
| 68 | 68 |
| 69 public: | 69 public: |
| 70 using DestructionCallback = | 70 using DestructionCallback = |
| 71 base::Callback<void(scoped_ptr<CallbacksType> callbacks)>; | 71 base::Callback<void(scoped_ptr<CallbacksType> callbacks)>; |
| 72 | 72 |
| 73 ScopedWebCallbacks(scoped_ptr<CallbacksType> callbacks, | 73 ScopedWebCallbacks(scoped_ptr<CallbacksType> callbacks, |
| 74 const DestructionCallback& destruction_callback) | 74 const DestructionCallback& destruction_callback) |
| 75 : callbacks_(callbacks.Pass()), | 75 : callbacks_(callbacks.Pass()), |
| 76 destruction_callback_(destruction_callback) {} | 76 destruction_callback_(destruction_callback) {} |
| 77 | 77 |
| 78 ~ScopedWebCallbacks() { | 78 ~ScopedWebCallbacks() { |
| 79 if (callbacks_) | 79 if (callbacks_) |
| 80 destruction_callback_.Run(callbacks_.Pass()); | 80 destruction_callback_.Run(callbacks_.Pass()); |
| 81 } | 81 } |
| 82 | 82 |
| 83 ScopedWebCallbacks(RValue other) { *this = other; } | 83 ScopedWebCallbacks(ScopedWebCallbacks&& other) { *this = other.Pass(); } |
| 84 | 84 |
| 85 ScopedWebCallbacks& operator=(RValue other) { | 85 ScopedWebCallbacks& operator=(ScopedWebCallbacks&& other) { |
| 86 callbacks_ = other.object->callbacks_.Pass(); | 86 callbacks_ = other.callbacks_.Pass(); |
| 87 destruction_callback_ = other.object->destruction_callback_; | 87 destruction_callback_ = other.destruction_callback_; |
| 88 return *this; | 88 return *this; |
| 89 } | 89 } |
| 90 | 90 |
| 91 scoped_ptr<CallbacksType> PassCallbacks() { return callbacks_.Pass(); } | 91 scoped_ptr<CallbacksType> PassCallbacks() { return callbacks_.Pass(); } |
| 92 | 92 |
| 93 private: | 93 private: |
| 94 scoped_ptr<CallbacksType> callbacks_; | 94 scoped_ptr<CallbacksType> callbacks_; |
| 95 DestructionCallback destruction_callback_; | 95 DestructionCallback destruction_callback_; |
| 96 }; | 96 }; |
| 97 | 97 |
| 98 template <typename CallbacksType> | 98 template <typename CallbacksType> |
| 99 ScopedWebCallbacks<CallbacksType> make_scoped_web_callbacks( | 99 ScopedWebCallbacks<CallbacksType> make_scoped_web_callbacks( |
| 100 CallbacksType* callbacks, | 100 CallbacksType* callbacks, |
| 101 const typename ScopedWebCallbacks<CallbacksType>::DestructionCallback& | 101 const typename ScopedWebCallbacks<CallbacksType>::DestructionCallback& |
| 102 destruction_callback) { | 102 destruction_callback) { |
| 103 return ScopedWebCallbacks<CallbacksType>(make_scoped_ptr(callbacks), | 103 return ScopedWebCallbacks<CallbacksType>(make_scoped_ptr(callbacks), |
| 104 destruction_callback); | 104 destruction_callback); |
| 105 } | 105 } |
| 106 | 106 |
| 107 #endif // CONTENT_CHILD_SCOPED_WEB_CALLBACKS_H_ | 107 #endif // CONTENT_CHILD_SCOPED_WEB_CALLBACKS_H_ |
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