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// Copyright 2019 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_ASH_CHILD_ACCOUNTS_USAGE_TIME_STATE_NOTIFIER_H_
#define CHROME_BROWSER_ASH_CHILD_ACCOUNTS_USAGE_TIME_STATE_NOTIFIER_H_
#include "base/no_destructor.h"
#include "base/observer_list.h"
#include "base/observer_list_types.h"
#include "chromeos/dbus/power/power_manager_client.h"
#include "chromeos/dbus/power_manager/idle.pb.h"
#include "components/session_manager/core/session_manager_observer.h"
namespace ash {
// Notify observers when the state of use of the device changes, that is, when
// the child is using the device or not. We define that the child is not using
// the device when one of the following events happens:
// * Session state change to some state different than ACTIVE;
// * When device is in suspend mode;
// * When the screen is powered off due user inactivity.
class UsageTimeStateNotifier : public session_manager::SessionManagerObserver,
public chromeos::PowerManagerClient::Observer {
public:
// Possible states for usage time.
enum class UsageTimeState {
// Active state means that the child is using the device.
ACTIVE,
// Inactive state means that the child is not using the device.
INACTIVE
};
class Observer : public base::CheckedObserver {
public:
// Called when usage time state changes to |state|.
virtual void OnUsageTimeStateChange(
UsageTimeStateNotifier::UsageTimeState state) = 0;
};
// Always returns the singleton instance of UsageTimeStateNotifier. It will
// initialize the instance in the first time it's called.
static UsageTimeStateNotifier* GetInstance();
UsageTimeStateNotifier(const UsageTimeStateNotifier&) = delete;
UsageTimeStateNotifier& operator=(const UsageTimeStateNotifier&) = delete;
// Adds and removes observers.
void AddObserver(UsageTimeStateNotifier::Observer* observer);
void RemoveObserver(UsageTimeStateNotifier::Observer* observer);
UsageTimeState GetState() const;
private:
UsageTimeStateNotifier();
~UsageTimeStateNotifier() override;
friend class base::NoDestructor<UsageTimeStateNotifier>;
// Sends a notification to all observers that usage time state is now |state|.
void ChangeUsageTimeState(UsageTimeStateNotifier::UsageTimeState state);
// session_manager::SessionManagerObserver:
void OnSessionStateChanged() override;
// power_manager::PowerManagerClient::Observer:
void ScreenIdleStateChanged(
const power_manager::ScreenIdleState& state) override;
void SuspendImminent(power_manager::SuspendImminent::Reason reason) override;
void SuspendDone(base::TimeDelta sleep_duration) override;
base::ObserverList<Observer> observers_;
UsageTimeState last_state_;
};
} // namespace ash
#endif // CHROME_BROWSER_ASH_CHILD_ACCOUNTS_USAGE_TIME_STATE_NOTIFIER_H_
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