System.Windows.Forms.XplatUIX11.GetActive C# (CSharp) Method

		internal override IntPtr GetActive() {
			IntPtr	actual_atom;
			int	actual_format;
			IntPtr	nitems;
			IntPtr	bytes_after;
			IntPtr	prop = IntPtr.Zero;
			IntPtr	active = IntPtr.Zero;

			XGetWindowProperty(DisplayHandle, RootWindow, _NET_ACTIVE_WINDOW, IntPtr.Zero, new IntPtr (1), false, (IntPtr)Atom.XA_WINDOW, out actual_atom, out actual_format, out nitems, out bytes_after, ref prop);
			if (((long)nitems > 0) && (prop != IntPtr.Zero)) {
				active = (IntPtr)Marshal.ReadInt32(prop);
				XFree(prop);
			}

			if (active != IntPtr.Zero) {
				Hwnd	hwnd;

				hwnd = Hwnd.GetObjectFromWindow(active);
				if (hwnd != null) {
					active = hwnd.Handle;
				} else {
					active = IntPtr.Zero;
				}
			}
			return active;
		}