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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_METRICS_DESKTOP_SESSION_DURATION_TOUCH_MODE_STATS_TRACKER_H_
#define CHROME_BROWSER_METRICS_DESKTOP_SESSION_DURATION_TOUCH_MODE_STATS_TRACKER_H_
#include "base/memory/raw_ptr.h"
#include "base/time/time.h"
#include "chrome/browser/metrics/desktop_session_duration/desktop_session_duration_tracker.h"
#include "ui/base/pointer/touch_ui_controller.h"
// Records active time spent in touch mode. Emits one sample to
// |kSessionTouchDurationHistogram| for every sample in
// "Session.TotalDuration", which is managed by
// |metrics::DesktopSessionDurationTracker|. Each sample is the time
// spent in touch mode within the corresponding session.
class TouchModeStatsTracker
: public metrics::DesktopSessionDurationTracker::Observer {
public:
TouchModeStatsTracker(
metrics::DesktopSessionDurationTracker* session_duration_tracker,
ui::TouchUiController* touch_ui_controller);
~TouchModeStatsTracker() override;
// Creates the global instance. Any call after the first is a no-op.
static void Initialize(
metrics::DesktopSessionDurationTracker* session_duration_tracker,
ui::TouchUiController* touch_ui_controller);
static const char kSessionTouchDurationHistogramName[];
private:
void TouchModeChanged();
// metrics::DesktopSessionDurationTracker::Observer:
void OnSessionStarted(base::TimeTicks session_start) override;
void OnSessionEnded(base::TimeDelta session_length,
base::TimeTicks session_end) override;
const raw_ptr<ui::TouchUiController> touch_ui_controller_;
base::CallbackListSubscription mode_change_subscription_;
// The time passed by OnSessionStarted() if there is an ongoing
// session, or 0 otherwise.
base::TimeTicks session_start_time_;
// The time of the last TouchModeChanged() call, or
// session_start_time_ if there's been no switch.
base::TimeTicks last_touch_mode_switch_in_session_;
// The total time spent in touch mode since the last OnSessionStarted() call,
// and before the corresponding OnSessionEnded() call. This value is logged
// and discarded upon OnSessionEnded().
base::TimeDelta touch_mode_duration_in_session_;
};
#endif // CHROME_BROWSER_METRICS_DESKTOP_SESSION_DURATION_TOUCH_MODE_STATS_TRACKER_H_
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