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/*
KeePass Password Safe - The Open-Source Password Manager
Copyright (C) 2003-2025 Dominik Reichl <dominik.reichl@t-online.de>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Text;
using System.Windows.Forms;
using Microsoft.Win32;
namespace KeePass.Util
{
public enum SessionLockReason
{
Unknown = 0,
Ending = 1,
Lock = 2,
Suspend = 3,
RemoteControlChange = 4,
UserSwitch = 5
}
public sealed class SessionLockEventArgs : EventArgs
{
private readonly SessionLockReason m_r;
public SessionLockReason Reason { get { return m_r; } }
public SessionLockEventArgs(SessionLockReason r)
{
m_r = r;
}
}
public sealed class SessionLockNotifier
{
private bool m_bEventsRegistered = false;
private EventHandler<SessionLockEventArgs> m_evHandler = null;
public SessionLockNotifier()
{
}
#if DEBUG
~SessionLockNotifier()
{
Debug.Assert(!m_bEventsRegistered);
}
#endif
public void Install(EventHandler<SessionLockEventArgs> ev)
{
Uninstall();
try
{
SystemEvents.SessionEnding += this.OnSessionEnding;
SystemEvents.SessionSwitch += this.OnSessionSwitch;
SystemEvents.PowerModeChanged += this.OnPowerModeChanged;
}
catch(Exception) { Debug.Assert(WinUtil.IsWindows2000); } // 2000 always throws
m_evHandler = ev;
m_bEventsRegistered = true;
}
public void Uninstall()
{
if(m_bEventsRegistered)
{
// Unregister event handlers (in the same order as registering,
// in case one of them throws)
try
{
SystemEvents.SessionEnding -= this.OnSessionEnding;
SystemEvents.SessionSwitch -= this.OnSessionSwitch;
SystemEvents.PowerModeChanged -= this.OnPowerModeChanged;
}
catch(Exception) { Debug.Assert(WinUtil.IsWindows2000); } // 2000 always throws
m_evHandler = null;
m_bEventsRegistered = false;
}
}
private void OnSessionEnding(object sender, SessionEndingEventArgs e)
{
if(m_evHandler != null)
m_evHandler(sender, new SessionLockEventArgs(SessionLockReason.Ending));
}
private void OnSessionSwitch(object sender, SessionSwitchEventArgs e)
{
if(m_evHandler != null)
{
SessionLockReason r = SessionLockReason.Unknown;
if(e.Reason == SessionSwitchReason.SessionLock)
r = SessionLockReason.Lock;
else if(e.Reason == SessionSwitchReason.SessionLogoff)
r = SessionLockReason.Ending;
else if(e.Reason == SessionSwitchReason.ConsoleDisconnect)
r = SessionLockReason.UserSwitch;
else if((e.Reason == SessionSwitchReason.SessionRemoteControl) ||
(e.Reason == SessionSwitchReason.RemoteConnect) ||
(e.Reason == SessionSwitchReason.RemoteDisconnect))
r = SessionLockReason.RemoteControlChange;
if(r != SessionLockReason.Unknown)
m_evHandler(sender, new SessionLockEventArgs(r));
}
}
private void OnPowerModeChanged(object sender, PowerModeChangedEventArgs e)
{
if((m_evHandler != null) && (e.Mode == PowerModes.Suspend))
m_evHandler(sender, new SessionLockEventArgs(SessionLockReason.Suspend));
}
}
}
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