@Override
      public void mouseDragged(MouseEvent e) {
        if (!myDragging) return;
        MouseEvent event = SwingUtilities.convertMouseEvent(e.getComponent(), e, MyDivider.this);
        final ToolWindowAnchor anchor = myInfo.getAnchor();
        final Point point = event.getPoint();
        final Container windowPane = InternalDecorator.this.getParent();
        myLastPoint = SwingUtilities.convertPoint(MyDivider.this, point, windowPane);
        myLastPoint.x = Math.min(Math.max(myLastPoint.x, 0), windowPane.getWidth());
        myLastPoint.y = Math.min(Math.max(myLastPoint.y, 0), windowPane.getHeight());

        final Rectangle bounds = InternalDecorator.this.getBounds();
        if (anchor == ToolWindowAnchor.TOP) {
          InternalDecorator.this.setBounds(0, 0, bounds.width, myLastPoint.y);
        } else if (anchor == ToolWindowAnchor.LEFT) {
          InternalDecorator.this.setBounds(0, 0, myLastPoint.x, bounds.height);
        } else if (anchor == ToolWindowAnchor.BOTTOM) {
          InternalDecorator.this.setBounds(
              0, myLastPoint.y, bounds.width, windowPane.getHeight() - myLastPoint.y);
        } else if (anchor == ToolWindowAnchor.RIGHT) {
          InternalDecorator.this.setBounds(
              myLastPoint.x, 0, windowPane.getWidth() - myLastPoint.x, bounds.height);
        }
        InternalDecorator.this.validate();
        e.consume();
      }
 boolean isInDragZone(MouseEvent e) {
   final Point p = SwingUtilities.convertMouseEvent(e.getComponent(), e, this).getPoint();
   return Math.abs(myInfo.getAnchor().isHorizontal() ? p.y : p.x) < 6;
 }