1  // Copyright (c) Microsoft Corporation
 2  // The Microsoft Corporation licenses this file to you under the MIT license.
 3  // See the LICENSE file in the project root for more information.
 4  
 5  using System.Runtime.InteropServices;
 6  
 7  namespace Microsoft.CmdPal.UI.Helpers;
 8  
 9  internal sealed partial class WindowHelper
10  {
11      public static bool IsWindowFullscreen()
12      {
13          UserNotificationState state;
14  
15          // https://learn.microsoft.com/en-us/windows/win32/api/shellapi/ne-shellapi-query_user_notification_state
16          if (Marshal.GetExceptionForHR(NativeMethods.SHQueryUserNotificationState(out state)) is null)
17          {
18              if (state == UserNotificationState.QUNS_RUNNING_D3D_FULL_SCREEN ||
19                  state == UserNotificationState.QUNS_BUSY ||
20                  state == UserNotificationState.QUNS_PRESENTATION_MODE)
21              {
22                  return true;
23              }
24          }
25  
26          return false;
27      }
28  }