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1 // Copyright 2017 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #ifndef COMPONENTS_KEYBOARD_LOCK_KEYBOARD_LOCK_HOST_H_ | |
6 #define COMPONENTS_KEYBOARD_LOCK_KEYBOARD_LOCK_HOST_H_ | |
7 | |
8 #include <memory> | |
9 | |
10 #include "base/gtest_prod_util.h" | |
11 #include "base/macros.h" | |
12 #include "base/synchronization/lock.h" | |
13 #include "components/keyboard_lock/key_event_interceptor.h" | |
14 | |
15 namespace base { | |
16 template <typename T> | |
17 struct DefaultSingletonTraits; | |
18 } // namespace base | |
19 | |
20 namespace keyboard_lock { | |
21 | |
22 class KeyEventInterceptorInstaller; | |
23 | |
24 FORWARD_DECLARE_TEST(KeyboardLockHostTest, KeyEventInterceptorInstallationTest); | |
25 | |
26 class KeyboardLockHost final { | |
27 public: | |
28 static KeyboardLockHost* GetInstance(); | |
29 | |
30 ~KeyboardLockHost(); | |
31 | |
32 // May return nullptr if not interceptor has been installed. This function | |
33 // never returns a destroyed object: only one KeyEventInterceptor installation | |
34 // is allowed during the lifetime of the process. | |
35 KeyEventInterceptor* interceptor() const; | |
dtapuska
2017/04/18 13:43:17
Returning a non-const ptr from a const object is w
Hzj_jie
2017/04/19 00:46:26
Done.
| |
36 | |
37 std::unique_ptr<KeyEventInterceptor::Retriever> GetInterceptorRetriever(); | |
38 | |
39 private: | |
40 // Allows KeyEventInterceptorInstaller to access SetKeyEventInterceptor(). | |
41 friend class KeyEventInterceptorInstaller; | |
42 | |
43 // Allows Singleton to create a instance of KeyboardLockHost. | |
44 friend struct base::DefaultSingletonTraits<KeyboardLockHost>; | |
45 | |
46 // Allows test cases to create a new instance of KeyboardLockHost. | |
47 FRIEND_TEST_ALL_PREFIXES(KeyboardLockHostTest, | |
48 KeyEventInterceptorInstallationTest); | |
49 | |
50 KeyboardLockHost(); | |
51 | |
52 void SetKeyEventInterceptor(std::unique_ptr<KeyEventInterceptor> interceptor); | |
53 | |
54 // GUARDED_BY(lock_) | |
55 std::unique_ptr<KeyEventInterceptor> interceptor_; | |
56 | |
57 // This lock only guards |interceptor_|, other function calls should be | |
58 // forwarded to UI thread. | |
59 mutable base::Lock lock_; | |
60 | |
61 DISALLOW_COPY_AND_ASSIGN(KeyboardLockHost); | |
62 }; | |
63 | |
64 } // namespace keyboard_lock | |
65 | |
66 #endif // COMPONENTS_KEYBOARD_LOCK_KEYBOARD_LOCK_HOST_H_ | |
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