JOptionPane传递自定义按钮

Question

我试图获取传递给JOptionPane的自定义按钮返回的值.但是我传递的按钮根本不返回值.仅当按下退出按钮时,返回的值为-1.我需要这个,因为我正在更改启用或禁用按钮的属性.我假设我需要按钮以某种方式将一些信息返回给JOptionPane.任何的想法？

    JButton button1= new JButton("Button 1");
    JButton button2= new JButton("Button 2");

    button1.setEnabled(false);

    int value = JOptionPane.showOptionDialog(null, "Heres a test message", "Test", JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE, null, new Object[]{button1, button2}, button1);
    JOptionPane.showMessageDialog(null, "You entered " + value);

Nb这与我之前的问题有关 - JOptionPane Gray Out One Button

我尝试设置按钮的值,就像你说的那样,但它们永远不会返回OK或CANCEL.

每当检查按钮的值时,它们永远不会返回我设置它们的值.

    JButton button1= new JButton("Button1");
    JButton button2= new JButton("Button2");

    button1.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                JOptionPane pane = getOptionPane((JComponent)e.getSource());
                // set the value of the option pane
                pane.setValue(JOptionPane.OK_OPTION);
            }
        });

    button2.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                JOptionPane pane = getOptionPane((JComponent)e.getSource());
                // set the value of the option pane
                pane.setValue(JOptionPane.CANCEL_OPTION);
            }
        });

      if (JOptionPane.showOptionDialog(null, "Pick a button", "Pick", JOptionPane.OK_CANCEL_OPTION, JOptionPane.QUESTION_MESSAGE, null, new Object[]{button1, button2}, button1) == JOptionPane.OK_OPTION) {
           JOptionPane.showMessageDialog(null, "Button1");
      }
      else{
           JOptionPane.showMessageDialog(null, "Button2");
      }

看到上面,无论如何我总是得到button2弹出窗口.

Answer 1

在我上一个问题链接到的示例中,按钮使用该JOptionPane#setValue方法设置返回值.这样您就可以像往常一样继续使用API​​,同时为您提供自定义功能.

            final JButton okay = new JButton("Ok");
            okay.addActionListener(new ActionListener() {
                @Override
                public void actionPerformed(ActionEvent e) {
                    JOptionPane pane = getOptionPane((JComponent)e.getSource());
                    // set the value of the option pane
                    pane.setValue(JOptionPane.OK_OPTION);
                }
            });

仔细查看JOptionPane.dialog上的Disable ok按钮,直到用户输入

更新

我已经通过代码并更正了actionPerformed方法以使其返回有效值...

final JButton okay = new JButton("Ok");
okay.addActionListener(new ActionListener() {
    @Override
    public void actionPerformed(ActionEvent e) {
        JOptionPane pane = getOptionPane((JComponent)e.getSource());
        pane.setValue(okay);
    }
});
okay.setEnabled(false);
final JButton cancel = new JButton("Cancel");
cancel.addActionListener(new ActionListener() {
    @Override
    public void actionPerformed(ActionEvent e) {
        JOptionPane pane = getOptionPane((JComponent)e.getSource());
        pane.setValue(cancel);
    }
});

options数组中值的索引返回的值(最后一个参数)

所以,例如......

int value = JOptionPane.showOptionDialog(
     null, 
     field, 
     "Get", 
     JOptionPane.YES_NO_OPTION, 
     JOptionPane.QUESTION_MESSAGE, 
     null, 
     new Object[]{okay, cancel}, 
     okay);

如果用户单击okay按钮,则返回值为0,或者如果他们选择取消按钮,则为1