code: @Override
  	public void onMouseMove(MouseMoveEvent event) {
  		if (dragging) {
  			Coordinate current = getScreenPosition(event);
  			getOverviewMap().movePov(current.getX() - previous.getX(), current.getY() - previous.getY());
  			previous = current;
  		}
  	}
docs: Only moving rectangle or reticle during drag.