public void mouseDragged(MouseEvent ev) {
      Window w = (Window) ev.getSource();
      Point pt = ev.getPoint();

      if (isMovingWindow) {
        Point windowPt;
        try {
          windowPt = (Point) AccessController.doPrivileged(getLocationAction);
          windowPt.x = windowPt.x - dragOffsetX;
          windowPt.y = windowPt.y - dragOffsetY;
          w.setLocation(windowPt);
        } catch (PrivilegedActionException e) {
        }
      } else if (dragCursor != 0) {
        Rectangle r = w.getBounds();
        Rectangle startBounds = new Rectangle(r);
        Dimension min = w.getMinimumSize();

        switch (dragCursor) {
          case Cursor.E_RESIZE_CURSOR:
            adjust(r, min, 0, 0, pt.x + (dragWidth - dragOffsetX) - r.width, 0);
            break;
          case Cursor.S_RESIZE_CURSOR:
            adjust(r, min, 0, 0, 0, pt.y + (dragHeight - dragOffsetY) - r.height);
            break;
          case Cursor.N_RESIZE_CURSOR:
            adjust(r, min, 0, pt.y - dragOffsetY, 0, -(pt.y - dragOffsetY));
            break;
          case Cursor.W_RESIZE_CURSOR:
            adjust(r, min, pt.x - dragOffsetX, 0, -(pt.x - dragOffsetX), 0);
            break;
          case Cursor.NE_RESIZE_CURSOR:
            adjust(
                r,
                min,
                0,
                pt.y - dragOffsetY,
                pt.x + (dragWidth - dragOffsetX) - r.width,
                -(pt.y - dragOffsetY));
            break;
          case Cursor.SE_RESIZE_CURSOR:
            adjust(
                r,
                min,
                0,
                0,
                pt.x + (dragWidth - dragOffsetX) - r.width,
                pt.y + (dragHeight - dragOffsetY) - r.height);
            break;
          case Cursor.NW_RESIZE_CURSOR:
            adjust(
                r,
                min,
                pt.x - dragOffsetX,
                pt.y - dragOffsetY,
                -(pt.x - dragOffsetX),
                -(pt.y - dragOffsetY));
            break;
          case Cursor.SW_RESIZE_CURSOR:
            adjust(
                r,
                min,
                pt.x - dragOffsetX,
                0,
                -(pt.x - dragOffsetX),
                pt.y + (dragHeight - dragOffsetY) - r.height);
            break;
          default:
            break;
        }
        if (!r.equals(startBounds)) {
          w.setBounds(r);
          // Defer repaint/validate on mouseReleased unless dynamic
          // layout is active.
          if (Toolkit.getDefaultToolkit().isDynamicLayoutActive()) {
            w.validate();
            getRootPane().repaint();
          }
        }
      }
    }
 public static void center(Window w) {
   Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
   Dimension windowSize = w.getSize();
   w.setLocation(
       (screenSize.width - windowSize.width) / 2, (screenSize.height - windowSize.height) / 2);
 }