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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2011 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_BROWSER_DEVICE_ORIENTATION_PROVIDER_H_ | 5 #ifndef CONTENT_BROWSER_DEVICE_ORIENTATION_PROVIDER_H_ |
6 #define CONTENT_BROWSER_DEVICE_ORIENTATION_PROVIDER_H_ | 6 #define CONTENT_BROWSER_DEVICE_ORIENTATION_PROVIDER_H_ |
7 | 7 |
8 #include "base/memory/ref_counted.h" | 8 #include "base/memory/ref_counted.h" |
9 #include "content/common/content_export.h" | 9 #include "content/common/content_export.h" |
10 | 10 |
11 namespace device_orientation { | 11 namespace device_orientation { |
12 | 12 |
13 class Orientation; | 13 class Orientation; |
14 | 14 |
15 class CONTENT_EXPORT Provider : public base::RefCountedThreadSafe<Provider> { | 15 class CONTENT_EXPORT Provider : public base::RefCountedThreadSafe<Provider> { |
16 public: | 16 public: |
17 class Observer { | 17 class Observer { |
18 public: | 18 public: |
19 // Called when the orientation changes. | 19 // Called when the orientation changes. |
20 // An Observer must not synchronously call Provider::RemoveObserver | 20 // An Observer must not synchronously call Provider::RemoveObserver |
21 // or Provider::AddObserver when this is called. | 21 // or Provider::AddObserver when this is called. |
22 virtual void OnOrientationUpdate(const Orientation& orientation) = 0; | 22 virtual void OnOrientationUpdate(const Orientation& orientation) = 0; |
| 23 |
| 24 protected: |
| 25 virtual ~Observer() {} |
23 }; | 26 }; |
24 | 27 |
25 // Returns a pointer to the singleton instance of this class. | 28 // Returns a pointer to the singleton instance of this class. |
26 // The caller should store the returned pointer in a scoped_refptr. | 29 // The caller should store the returned pointer in a scoped_refptr. |
27 // The Provider instance is lazily constructed when GetInstance() is called, | 30 // The Provider instance is lazily constructed when GetInstance() is called, |
28 // and destructed when the last scoped_refptr referring to it is destructed. | 31 // and destructed when the last scoped_refptr referring to it is destructed. |
29 static Provider* GetInstance(); | 32 static Provider* GetInstance(); |
30 | 33 |
31 // Inject a mock Provider for testing. Only a weak pointer to the injected | 34 // Inject a mock Provider for testing. Only a weak pointer to the injected |
32 // object will be held by Provider, i.e. it does not itself contribute to the | 35 // object will be held by Provider, i.e. it does not itself contribute to the |
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48 private: | 51 private: |
49 friend class base::RefCountedThreadSafe<Provider>; | 52 friend class base::RefCountedThreadSafe<Provider>; |
50 static Provider* instance_; | 53 static Provider* instance_; |
51 | 54 |
52 DISALLOW_COPY_AND_ASSIGN(Provider); | 55 DISALLOW_COPY_AND_ASSIGN(Provider); |
53 }; | 56 }; |
54 | 57 |
55 } // namespace device_orientation | 58 } // namespace device_orientation |
56 | 59 |
57 #endif // CONTENT_BROWSER_DEVICE_ORIENTATION_PROVIDER_H_ | 60 #endif // CONTENT_BROWSER_DEVICE_ORIENTATION_PROVIDER_H_ |
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