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

		private void QueryPointer (IntPtr display, IntPtr w, out IntPtr root, out IntPtr child,
					   out int root_x, out int root_y, out int child_x, out int child_y,
					   out int mask)
		{
			/* this code was written with the help of
			glance at gdk.  I never would have realized we
			needed a loop in order to traverse down in the
			hierarchy.  I would have assumed you'd get the
			most deeply nested child and have to do
			XQueryTree to move back up the hierarchy..
			stupid me, of course. */
			IntPtr c;

			XGrabServer (display);

			XQueryPointer(display, w, out root, out c,
				      out root_x, out root_y, out child_x, out child_y,
				      out mask);

			if (root != w)
				c = root;

			IntPtr child_last = IntPtr.Zero;
			while (c != IntPtr.Zero) {
				child_last = c;
				XQueryPointer(display, c, out root, out c,
					      out root_x, out root_y, out child_x, out child_y,
					      out mask);
			}
			XUngrabServer (display);
			XFlush (display);

			child = child_last;
		}