JScrollPopupMenu.java 文件源码

private JScrollBar getScrollBar()
{
    if (popupScrollBar == null)
    {
        popupScrollBar = new JScrollBar(JScrollBar.VERTICAL);
        popupScrollBar.addAdjustmentListener(new AdjustmentListener()
        {
            @Override
            public void adjustmentValueChanged(AdjustmentEvent e)
            {
                doLayout();
                repaint();
            }
        });

        popupScrollBar.setVisible(false);
    }

    return popupScrollBar;
}