case KeyEvent.VK_RIGHT:
return new KeyRightOperation(this);
case KeyEvent.VK_UP:
return new KeyUpOperation(this);
case KeyEvent.VK_DOWN:
return new KeyDownOperation(this);
case KeyEvent.VK_PAGE_UP:
return new PageUpOperation(this);
case KeyEvent.VK_PAGE_DOWN:
return new PageDownOperation(this);
}