ash/metrics/desktop_task_switch_metric_recorder.h

   1 // Copyright 2015 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 ASH_METRICS_DESKTOP_TASK_SWITCH_METRIC_RECORDER_H_
   6 #define ASH_METRICS_DESKTOP_TASK_SWITCH_METRIC_RECORDER_H_
   7
   8 #include "ash/ash_export.h"
   9 #include "base/macros.h"
  10 #include "ui/wm/public/activation_change_observer.h"
  11
  12 namespace ash {
  13
  14 class UserMetricsRecorder;
  15
  16 // Tracks metrics for task switches caused by the user activating a task window
  17 // by clicking or tapping on it.
  18 class ASH_EXPORT DesktopTaskSwitchMetricRecorder
  19     : public aura::client::ActivationChangeObserver {
  20  public:
  21   explicit DesktopTaskSwitchMetricRecorder();
  22   ~DesktopTaskSwitchMetricRecorder() override;
  23
  24   // aura::client::ActivationChangeObserver:
  25   void OnWindowActivated(
  26       aura::client::ActivationChangeObserver::ActivationReason reason,
  27       aura::Window* gained_active,
  28       aura::Window* lost_active) override;
  29
  30  private:
  31   // Tracks the last active task window.
  32   aura::Window* last_active_task_window_;
  33
  34   DISALLOW_COPY_AND_ASSIGN(DesktopTaskSwitchMetricRecorder);
  35 };
  36
  37 }  // namespace ash
  38
  39 #endif  // ASH_METRICS_DESKTOP_TASK_SWITCH_METRIC_RECORDER_H_