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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 UI_EVENTS_IDLE_FRACTION_RECORDER_H_ |
| 6 #define UI_EVENTS_IDLE_FRACTION_RECORDER_H_ |
| 7 |
| 8 #include "base/time/time.h" |
| 9 #include "ui/events/events_base_export.h" |
| 10 |
| 11 namespace ui { |
| 12 |
| 13 // Receives as input a set of timestamps indicating when events were |
| 14 // received. Reports via UMA the fraction of the time per |window_size_| that |
| 15 // the user was interacting. |
| 16 class EVENTS_BASE_EXPORT FractionOfTimeWithoutUserInputRecorder { |
| 17 public: |
| 18 FractionOfTimeWithoutUserInputRecorder(); |
| 19 void RecordEventAtTime(base::TimeTicks start_time); |
| 20 |
| 21 protected: |
| 22 virtual void RecordActiveInterval(base::TimeTicks start_time, |
| 23 base::TimeTicks end_time); |
| 24 void RecordToUma(float idle_fraction) const; |
| 25 void set_window_size(base::TimeDelta window_size) { |
| 26 window_size_ = window_size; |
| 27 } |
| 28 void set_idle_timeout(base::TimeDelta idle_timeout) { |
| 29 idle_timeout_ = idle_timeout; |
| 30 } |
| 31 |
| 32 private: |
| 33 // Within the current period of length |window_size_|, how long has the user |
| 34 // been active? |
| 35 base::TimeDelta current_window_active_time_; |
| 36 // If the user is currently active, when did they start being active? |
| 37 base::TimeTicks active_duration_start_time_; |
| 38 base::TimeTicks window_start_time_; |
| 39 base::TimeTicks previous_event_end_time_; |
| 40 |
| 41 // We report the fraction of the time we were idle once per |window_size_|. |
| 42 base::TimeDelta window_size_; |
| 43 |
| 44 // Two events within |idle_timeout_| of one another are considered to be in |
| 45 // the same period of user activity. |
| 46 base::TimeDelta idle_timeout_; |
| 47 }; |
| 48 |
| 49 } // namespace ui |
| 50 |
| 51 #endif // UI_EVENTS_IDLE_FRACTION_RECORDER_H_ |
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