if (layout == null) {
switch (e.getKeyCode()) {
case KeyEvent.VK_LEFT:
return new KeyLeftOperation(this);
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: