为什么我不能在 Java 中首先获得鼠标点击计数 == 2？

Question

在我的 Java Swing 应用程序中，我有一个 JList，当我双击列表中的一个项目时，它总是先点击计数 == 1 然后再点击计数 == 2、为什么？

 list.addMouseListener(new MouseAdapter()
 {
   public void mouseClicked(MouseEvent e)
   {
     if (SwingUtilities.isLeftMouseButton(e))
     {
       if (e.getClickCount()==1) Out("Left-ClickCount()==1");
       else if (e.getClickCount()==2) Out("Left-ClickCount()==2");     
     }
     else if (SwingUtilities.isRightMouseButton(e))
     {
       if (e.getClickCount()==2) Out("Right-ClickCount()==2");
       else if (e.getClickCount()==1) Out("Right-ClickCount()==1");
     }
   }
 });

不管我点击多快，我故意把"if (e.getClickCount()==2)"放在"else if (e.getClickCount()==1)"之前，它还是先抓到ClickCount==1？为什么？如何解决？

Answer 1

好的，经过 Goggling 和我自己的改进后，下面是符合我最初预期的代码：

  boolean isAlreadyOneClick=false;
...
    DefaultListModel xlistModel=new DefaultListModel();
    JList xlist=new JList(xlistModel);
    xlist.addMouseListener(new MouseAdapter()
    {
      public void mouseClicked(MouseEvent e)
      {
        int index=xlist.locationToIndex(e.getPoint());
        String item=xlistModel.getElementAt(index).toString();

        if (SwingUtilities.isLeftMouseButton(e))
        {
          if (isAlreadyOneClick)
          {
            System.out.println("Left double click : "+item);
            isAlreadyOneClick=false;
          }
          else
          {
            isAlreadyOneClick=true;
            Timer t=new Timer("doubleclickTimer",false);
            t.schedule(new TimerTask()
            {
              @Override
              public void run()
              {
                if (isAlreadyOneClick) System.out.println("Left single click : "+item);
                isAlreadyOneClick=false;
              }
            },250);
          }              
        }
        else if (SwingUtilities.isRightMouseButton(e))
        {
          if (isAlreadyOneClick)
          {
            System.out.println("Right double click : "+item);
            isAlreadyOneClick=false;
          }
          else
          {
            isAlreadyOneClick=true;
            Timer t=new Timer("doubleclickTimer",false);
            t.schedule(new TimerTask()
            {
              @Override
              public void run()
              {
                if (isAlreadyOneClick) System.out.println("Right single click : "+item);
                isAlreadyOneClick=false;
              }
            },250);
          }
        }
      }
    });

    xlistModel.addElement("123");
    xlistModel.addElement("abc");
    JFrame f=new JFrame("Test Clicks");
    f.add(xlist);
    f.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent we) { } });
    f.setBackground(SystemColor.control);

    f.pack();
    f.setLocationRelativeTo(null);
    f.setVisible(true);

为什么我不能在 Java 中首先获得鼠标点击计数 == 2？

Why can't I get to mouse click count == 2 first in Java?

java

swing

jlist

click-counting