/// <summary>
/// Creates a new <c>SystemEventNotifier</c> instance and sets up some
/// required resources.
/// </summary>
/// <param name="maxIdleSeconds">The maximum system idle time in seconds before the
/// <c>Idle</c> event is being raised.</param>
public SystemEventNotifier(int maxIdleSeconds = 60 * 15)
{
Log.Information($"Instanciating System Event Notifier");
_cts = new CancellationTokenSource();
_ct = _cts.Token;
this._maxIdleSeconds = maxIdleSeconds;
//Subscribe to an apple notification fired when the screen is locked
((NSDistributedNotificationCenter)NSDistributedNotificationCenter.DefaultCenter).AddObserver(new NSString("com.apple.screenIsLocked"), (obj) =>
{
Log.Information("Detected session lock");
SessionLock?.Invoke(this, new SystemEventArgs("Session Lock"));
});
//Subscribe to an apple notification fired when the screen saver starts
((NSDistributedNotificationCenter)NSDistributedNotificationCenter.DefaultCenter).AddObserver(new NSString("com.apple.screensaver.didstart"), (obj) =>
{
Log.Information("Detected Screen Saver");
Screensaver?.Invoke(this, new SystemEventArgs("Screensaver"));
});
//Subscribe to an apple notification fired when the System goes to Sleep
NSWorkspace.Notifications.ObserveWillSleep((s, e) =>
{
Log.Information("Detected Standy");
Standby?.Invoke(this, new SystemEventArgs("Stand By"));
});
//Subscribe to an apple notification fired when the System goes to power off / reboot
NSWorkspace.Notifications.ObserveWillPowerOff((s, e) =>
{
Log.Information("Detected PowerOff / Reboot");
ShutdownOrRestart?.Invoke(this, new SystemEventArgs("System ShutDown / Reboot"));
});
//Subscribe to an apple notification fired when the System goes to Log off the current User
NSWorkspace.Notifications.ObserveSessionDidResignActive((s, e) =>
{
Log.Information("Detected PowerOff / Reboot");
SessionLogoff?.Invoke(this, new SystemEventArgs("Session Log Off"));
});
// Start a task to poll Idle Time Global Environment Variable
_pollTask = new Task(() =>
{
Log.Information("SystemEventNotifier polling task started");
Thread.Sleep(POLL_INTERVAL); //Sleep at first to give Mac Delegate time
while (!_ct.IsCancellationRequested)
{
// Check system idle time
TimeSpan idletime = AppDelegate.CheckIdleTime();
Log.Debug("Idle time: {IdleTime}", idletime.ToString());
if (idletime.TotalSeconds > _maxIdleSeconds)
{
if (!_idleDetected)
{
Idle?.Invoke(this, new SystemEventArgs("Idle Timeout"));
Log.Information("Detected idle timeout");
_idleDetected = true;
}
}
else
{
if (_idleDetected)
{
_idleDetected = false;
}
}
Thread.Sleep(POLL_INTERVAL);
}
Log.Information("SystemEventNotifier polling task ending");
}, _ct);
_pollTask.Start();
Log.Information($"System Event Notifier was Innitialized Successfully");
}
public IntPtr WndProc(IntPtr hWnd, uint msg, IntPtr wParam, IntPtr lParam)
{
Log.Debug("SystemEventNotifier WndProc: MSG={Msg}, wParam={wParam}, lParam={lParam}",
((UnmanagedMethods.WindowsMessage)msg).ToString(),
((UnmanagedMethods.WindowsMessage)wParam.ToInt32()).ToString(),
((UnmanagedMethods.WindowsMessage)lParam.ToInt32()).ToString());
switch (msg)
{
case (uint)UnmanagedMethods.WindowsMessage.WM_WTSSESSION_CHANGE:
switch (wParam.ToInt32())
{
case UnmanagedMethods.WTS_SESSION_LOGOFF:
SessionLogoff?.Invoke(this, new SystemEventArgs("Session Logoff"));
Log.Information("Detected session logoff");
break;
case UnmanagedMethods.WTS_SESSION_LOCK:
SessionLock?.Invoke(this, new SystemEventArgs("Session Lock"));
Log.Information("Detected session lock");
break;
}
break;
case (uint)UnmanagedMethods.WindowsMessage.WM_ENDSESSION:
// If the session is being ended, the wParam parameter is TRUE;
// the session can end any time after all applications have returned
// from processing this message. Otherwise, it is FALSE.
if (wParam.ToInt32() == 0)
{
break;
}
switch (lParam.ToInt32())
{
case 0: //Shutdown or restart
ShutdownOrRestart?.Invoke(this, new SystemEventArgs("System Shutdown/Restart"));
Log.Information("Detected system shutdown/restart");
break;
case UnmanagedMethods.ENDSESSION_LOGOFF:
case UnmanagedMethods.ENDSESSION_CLOSEAPP:
case UnmanagedMethods.ENDSESSION_CRITICAL:
SessionLogoff?.Invoke(this, new SystemEventArgs("Session Ending"));
Log.Information("Detected end of session");
break;
}
break;
case (uint)UnmanagedMethods.WindowsMessage.WM_POWERBROADCAST:
switch (wParam.ToInt32())
{
case UnmanagedMethods.PBT_APMSUSPEND:
case UnmanagedMethods.PBT_APMSTANDBY:
Standby?.Invoke(this, new SystemEventArgs("Standby"));
Log.Information("Detected entering sleep mode");
break;
}
break;
default:
break;
}
return(IntPtr.Zero);
}
