JTextField焦点问题 [英] Problem to focus JTextField

问题描述

（仅在Ubuntu中出现问题，在Windows中可以正常工作，在其他Linux环境中不知道）

(Problem occur in Ubuntu only. Works fine in Windows. I don't know in other Linux environments)

我已经使用ComponentListener的方法来调用焦点在JTextField中的一个对话框中，但是对于这种情况，只是不行，我不知道为什么。它显示文本字段中的焦点，并快速切换到按钮。运行并看到：

I have used the approach of the ComponentListener to call focus in JTextField within a dialog, but for this case is just not working, I don't know why. It shows the focus in the text field and fast change to the button. Run and see:

import java.awt.Component;
import java.awt.GridLayout;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;

import javax.swing.JDialog;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;

public class User {

    private String username = "";
    private String password = "";

    public User() {
    // default constructor
    }

    public User(String username, String password) {
    this.username = username;
    this.password = password;
    }

    /** Create a panel containing the componet and tha label. */
    public JPanel createLabeledComponent(JLabel label, Component comp) {
    GridLayout layout = new GridLayout(2, 1);
    JPanel panel = new JPanel(layout);
    panel.add(label);
    panel.add(comp);
    label.setLabelFor(comp);
    return panel;
    }

    public void showEditDialog() {

    JLabel usernameLbl = new JLabel(username);
    final JTextField usernameField = new JTextField();
    usernameField.setText(username);
    JPanel usernamePnl = createLabeledComponent(usernameLbl, usernameField);

    JLabel passwordLbl = new JLabel(password);
    JPasswordField passwordField = new JPasswordField(password);
    JPanel passwordPnl = createLabeledComponent(passwordLbl, passwordField);

    Object[] fields = { "User:", usernamePnl, "Password:", passwordPnl };

    JOptionPane optionPane = new JOptionPane(fields, JOptionPane.PLAIN_MESSAGE,
        JOptionPane.OK_CANCEL_OPTION, null, null);
    JDialog dialog = optionPane.createDialog("User Data");

    dialog.addComponentListener(new ComponentAdapter() {
        @Override
        public void componentShown(ComponentEvent e) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
            usernameField.requestFocusInWindow();
            }
        });
        }
    });

    dialog.setVisible(true);
    }

    public static void main(String[] args) {
    SwingUtilities.invokeLater(new Runnable() {
        @Override
        public void run() {
        new User().showEditDialog();
        }
    });
    }

}

任何想法如何解决？

- 更新

不幸的是，同样的行为。

Everything running on EDT now. Sadly with the same behavior.

顺便说一句，使用JOptionPane构造函数的最后一个参数（Object initialValue）不起作用。

By the way, either using the last argument (Object initialValue) of the JOptionPane constructor doesn't work.

推荐答案

我记得有一个类似的问题，我使用这个页面底部找到的解决方案：

I remember having a similar problem, I used the solution found at the bottom of this page:

http://bugs.sun.com/bugdatabase/view_bug.do？ bug_id = 5018574

这篇关于JTextField焦点问题的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！