ash/system/power/power_event_observer.h

// Copyright 2013 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_POWER_POWER_EVENT_OBSERVER_H_
#define ASH_SYSTEM_POWER_POWER_EVENT_OBSERVER_H_

#include "ash/ash_export.h"
#include "base/callback.h"
#include "base/compiler_specific.h"
#include "base/macros.h"
#include "chromeos/dbus/power_manager_client.h"
#include "chromeos/dbus/session_manager_client.h"

namespace ash {

// A class that observes power-management-related events.
class ASH_EXPORT PowerEventObserver
    : public chromeos::PowerManagerClient::Observer,
      public chromeos::SessionManagerClient::Observer {
 public:
  // This class registers/unregisters itself as an observer in ctor/dtor.
  PowerEventObserver();
  ~PowerEventObserver() override;

  // Called by the WebUIScreenLocker when all the lock screen animations have
  // completed.  This really should be implemented via an observer but since
  // ash/ isn't allowed to depend on chrome/ we need to have the
  // WebUIScreenLocker reach into ash::Shell to make this call.
  void OnLockAnimationsComplete();

  // chromeos::PowerManagerClient::Observer overrides:
  void BrightnessChanged(int level, bool user_initiated) override;
  void SuspendImminent() override;
  void SuspendDone(const base::TimeDelta& sleep_duration) override;

  // chromeos::SessionManagerClient::Observer overrides.
  void ScreenIsLocked() override;
  void ScreenIsUnlocked() override;

  // Is the screen currently locked?
  bool screen_locked_;

  // Have the lock screen animations completed?
  bool waiting_for_lock_screen_animations_;

  // If set, called when the lock screen animations have completed to confirm
  // that the system is ready to be suspended.
  base::Closure screen_lock_callback_;

 private:
  DISALLOW_COPY_AND_ASSIGN(PowerEventObserver);
};

}  // namespace chromeos

#endif  // ASH_SYSTEM_POWER_POWER_EVENT_OBSERVER_H_