❔ WPF Window click-thru/non-clickable

[DllImport("user32.dll", EntryPoint = "SetWindowLongA", SetLastError = true, CharSet = CharSet.Unicode)]
public static extern int SetWindowLong(IntPtr hWnd, int nIndex, int dwNewLong);

[DllImport("user32.dll", EntryPoint = "GetWindowLongA", SetLastError = true, CharSet = CharSet.Unicode)]
public static extern int GetWindowLong(IntPtr hWnd, int nIndex);

public const int WS_EX_TRANSPARENT = 0x00000020;
public const int GWL_EXSTYLE = (-20);

public static void MakeTransParent(IntPtr hWnd)
{
  int extendedStyle = GetWindowLong(hWnd, GWL_EXSTYLE);
  SetWindowLong(hWnd, GWL_EXSTYLE, extendedStyle | WS_EX_TRANSPARENT);
}