docs: private void slideKnob(Event event) {
  
          if (m_slidingMouse) {
              m_lastMouseY = event.getClientY();
              int shift = (int)((m_lastMouseY - m_mouseSlidingStartY) / m_positionValueRatio);
              int nextValue = m_mouseSlidingStartValue + shift;
              CmsDebugLog.getInstance().printLine("Mouse sliding should set value to: " + nextValue);
              int max = getMaximumVerticalScrollPosition();
              int min = getMinimumVerticalScrollPosition();
              if (nextValue < min) {
                  nextValue = min;
              } else if (nextValue > max) {
                  nextValue = max;
              }
              setValue(Integer.valueOf(nextValue));
          }
      }