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| 1 // Copyright 2013 The Chromium Authors. All rights reserved. | 1 // Copyright 2013 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 ASH_KEYBOARD_UMA_EVENT_FILTER_H_ | 5 #ifndef ASH_KEYBOARD_UMA_EVENT_FILTER_H_ |
| 6 #define ASH_KEYBOARD_UMA_EVENT_FILTER_H_ | 6 #define ASH_KEYBOARD_UMA_EVENT_FILTER_H_ |
| 7 | 7 |
| 8 #include "base/compiler_specific.h" | 8 #include "base/compiler_specific.h" |
| 9 #include "base/time/time.h" | 9 #include "base/time/time.h" |
| 10 #include "ui/events/event_handler.h" | 10 #include "ui/events/event_handler.h" |
| 11 | 11 |
| 12 namespace ash { | 12 namespace ash { |
| 13 | 13 |
| 14 // EventFilter for tracking keyboard-related metrics, which intercepts events | 14 // EventFilter for tracking keyboard-related metrics, which intercepts events |
| 15 // before they are processed by the usual path and logs metrics about the | 15 // before they are processed by the usual path and logs metrics about the |
| 16 // events. | 16 // events. |
| 17 class KeyboardUMAEventFilter : public ui::EventHandler { | 17 class KeyboardUMAEventFilter : public ui::EventHandler { |
| 18 public: | 18 public: |
| 19 KeyboardUMAEventFilter(); | 19 KeyboardUMAEventFilter(); |
| 20 virtual ~KeyboardUMAEventFilter(); | 20 virtual ~KeyboardUMAEventFilter(); |
| 21 | 21 |
| 22 // ui::EventHandler overrides: | 22 // ui::EventHandler overrides: |
| 23 virtual void OnKeyEvent(ui::KeyEvent* event) OVERRIDE; | 23 virtual void OnKeyEvent(ui::KeyEvent* event) override; |
| 24 | 24 |
| 25 private: | 25 private: |
| 26 // The timestamp of the last character keystroke. | 26 // The timestamp of the last character keystroke. |
| 27 base::TimeDelta last_keystroke_time_; | 27 base::TimeDelta last_keystroke_time_; |
| 28 | 28 |
| 29 DISALLOW_COPY_AND_ASSIGN(KeyboardUMAEventFilter); | 29 DISALLOW_COPY_AND_ASSIGN(KeyboardUMAEventFilter); |
| 30 }; | 30 }; |
| 31 | 31 |
| 32 } // namespace ash | 32 } // namespace ash |
| 33 | 33 |
| 34 #endif // ASH_KEYBOARD_UMA_EVENT_FILTER_H_ | 34 #endif // ASH_KEYBOARD_UMA_EVENT_FILTER_H_ |
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