ash/system/tray/time_to_click_recorder.h

// Copyright 2018 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 ASH_SYSTEM_TRAY_TIME_TO_CLICK_RECORDER_H_
#define ASH_SYSTEM_TRAY_TIME_TO_CLICK_RECORDER_H_

#include "ui/events/event_handler.h"

namespace views {
class View;
}  // namespace views

namespace ash {

// An event handler that will be installed as PreTargetHandler of |target_view|
// to record TimeToClick metrics.
class TimeToClickRecorder : public ui::EventHandler {
 public:
  class Delegate {
   public:
    virtual ~Delegate() {}

    // Record TimeToClick metrics. Called by TimeToClickRecorder which is a
    // PreTargetHandler of |target_view|.
    virtual void RecordTimeToClick() = 0;
  };

  TimeToClickRecorder(Delegate* delegate, views::View* target_view);
  ~TimeToClickRecorder() override = default;

 private:
  // ui::EventHandler:
  void OnEvent(ui::Event* event) override;

  Delegate* const delegate_;

  DISALLOW_COPY_AND_ASSIGN(TimeToClickRecorder);
};

}  // namespace ash

#endif  // ASH_SYSTEM_TRAY_TIME_TO_CLICK_RECORDER_H_