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// Copyright (c) 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.
#include "ash/ash_export.h"
#include "base/macros.h"
#include "base/observer_list_types.h"
#include "components/session_manager/session_manager_types.h"
class AccountId;
class PrefService;
namespace ash {
enum class LoginStatus;
class ASH_EXPORT SessionObserver : public base::CheckedObserver {
// Called when the active user session has changed.
virtual void OnActiveUserSessionChanged(const AccountId& account_id) {}
// Called when a user session gets added to the existing session.
virtual void OnUserSessionAdded(const AccountId& account_id) {}
// Called once the first time a user session starts.
virtual void OnFirstSessionStarted() {}
// Called when a user session is updated, such as avatar change.
virtual void OnUserSessionUpdated(const AccountId& account_id) {}
// Called when the session state is changed.
virtual void OnSessionStateChanged(session_manager::SessionState state) {}
// Called when the login status is changed. |login_status| is the new status.
virtual void OnLoginStatusChanged(LoginStatus login_status) {}
// Called when the lock state is changed. |locked| is the current lock stated.
virtual void OnLockStateChanged(bool locked) {}
// Called when chrome is terminating.
virtual void OnChromeTerminating() {}
// Called when the limit becomes available and when it changes.
virtual void OnSessionLengthLimitChanged() {}
// Called when the signin screen profile |prefs| are ready.
virtual void OnSigninScreenPrefServiceInitialized(PrefService* prefs) {}
// Called when the PrefService for the active user session changes, i.e.
// after the first user logs in, after a multiprofile user is added, and after
// switching to a different multiprofile user. Happens later than
// OnActiveUserSessionChanged() because the PrefService is asynchronously
// initialized. Never called with null.
virtual void OnActiveUserPrefServiceChanged(PrefService* pref_service) {}
~SessionObserver() override {}
// A class to attach / detach an object as a session state observer.
// NOTE: Both ash::Shell and ash::SessionControllerImpl must outlive your
// object. You may find it clearer to manually add and remove your observer.
class ASH_EXPORT ScopedSessionObserver {
explicit ScopedSessionObserver(SessionObserver* observer);
virtual ~ScopedSessionObserver();
SessionObserver* const observer_;
} // namespace ash