Index: components/keyboard_lock/key_event_interceptor.h |
diff --git a/components/keyboard_lock/key_event_interceptor.h b/components/keyboard_lock/key_event_interceptor.h |
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index 0000000000000000000000000000000000000000..573626179075ad8a380a13b3b95027ae6f664e59 |
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+++ b/components/keyboard_lock/key_event_interceptor.h |
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+// Copyright 2017 The Chromium Authors. All rights reserved. |
+// Use of this source code is governed by a BSD-style license that can be |
+// found in the LICENSE file. |
+ |
+#ifndef COMPONENTS_KEYBOARD_LOCK_KEY_EVENT_INTERCEPTOR_H_ |
+#define COMPONENTS_KEYBOARD_LOCK_KEY_EVENT_INTERCEPTOR_H_ |
+ |
+#include "ui/events/keycodes/keyboard_codes.h" |
+ |
+namespace keyboard_lock { |
+ |
+// An interface to receive and process a key event. |
+class KeyEventInterceptor { |
+ public: |
+ KeyEventInterceptor() = default; |
+ virtual ~KeyEventInterceptor() = default; |
+ |
+ virtual bool OnKeyDown(ui::KeyboardCode code) = 0; |
+ virtual bool OnKeyUp(ui::KeyboardCode code) = 0; |
+ |
+ // An interface to retrieve a KeyEventInterceptor instance. This class is used |
+ // to avoid the dependency of the singleton object of KeyboardLockHost, and to |
+ // ensure late installed KeyEventInterceptor can be retrieved. |
+ class Retriever { |
+ public: |
+ Retriever() = default; |
+ virtual ~Retriever() = default; |
+ |
+ // May return nullptr. |
+ virtual KeyEventInterceptor* Get() = 0; |
+ }; |
+}; |
+ |
+} // namespace keyboard_lock |
+ |
+#endif // COMPONENTS_KEYBOARD_LOCK_KEY_EVENT_INTERCEPTOR_H_ |