在加载子面板时,Swing Parent JFrame / JPanel不可用/可点击

时间:2012-11-23 08:12:54

标签: java swing jframe jpanel

当用户点击新JFrame {{AdminFrame按钮时,我正在加载addLocation addUser(在其上添加用户和JFrame按钮) 1}}加载并获取用户信息。当信息提交给服务器时需要一些时间(因为服务器是基于网络的),在那段时间我的两个面板都卡住了...我想要的是让addUser 可点击 use-able ,以便用户可以添加新用户或添加位置... 这是我的AdminFrame添加按钮的模板代码...不写原始代码,因为原始代码太乱了..

AdminPanel

现在这里是我的AddUser Panel的adduser按钮Templete代码Orignal代码太乱了..

public class AdminPanel extends JFrame{
       public AdminPanel(){
           Initalize();//Do Initalize Stuff
       }
       public void addBtnActionPerformed(){
           //load Child Form
       }
}//End of class

2 个答案:

答案 0 :(得分:4)

据我所知,你的问题是你没有在事件调度线程上创建你的GUI,而是你创建另一个JFrame,你的任务可能很长初始线程 再次 - 因为第一个JFrame也是在初始线程上创建的。

1)不要不必要地扩展JFrame类,因为你可能想扩展另一个非常必要的类,但由于java中缺少多重继承而无法扩展。而是在JFrame创建和实例,并在实例上调用方法,如:

JFrame frame=new JFrame();
frame.setDefaultCloseOperation(..);
frame.add(..);

2)在Event Dispatch Thread上创建Swing组件,如下所示:

    SwingUtilities.invokeLater(new Runnable() {
        @Override
        public void run() {
           //create Swing and UI components here
        }
    });

3)见The Use of Multiple JFrames, Good/Bad Practice?。而是使用JDialog,我认为这将是您的目标或CardLayout(允许在单个JFrame / Container上的各种组件之间翻转。

4)在EDT上使用Swing Worker执行长时间运行的任务(否则GUI,包括应用程序的其他打开窗口,将无法响应)

答案 1 :(得分:4)

您需要使用SwingWorker将繁重/冗长的操作分配到另一个线程,允许UI-Thread(EDT)响应事件。

这是一个非常简单的代码,展示了如何使用SwingWorker(这里连接到服务器的连接是Thread.sleep()):

import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.List;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JProgressBar;
import javax.swing.SwingUtilities;
import javax.swing.SwingWorker;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class TestJFrame implements ActionListener {
    private JProgressBar progress;
    private JButton startButton;
    private JButton testButton;
    private SwingWorker<Void, Integer> worker;

    public void initUI() {
        JFrame frame = new JFrame(TestJFrame.class.getSimpleName());
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        progress = new JProgressBar(0, 100);
        startButton = new JButton("Start work");
        testButton = new JButton("Test me while work is in progress");
        startButton.addActionListener(this);
        testButton.addActionListener(this);
        JPanel buttonPanel = new JPanel(new FlowLayout());
        buttonPanel.add(startButton);
        buttonPanel.add(testButton);
        frame.add(buttonPanel, BorderLayout.NORTH);
        frame.add(progress, BorderLayout.SOUTH);
        frame.setSize(600, 400);
        frame.setVisible(true);
    }

    private void showTestDialog() {
        if (worker != null) {
            JOptionPane.showMessageDialog(testButton, "You made a test. See how I still respond while heavy job is in progress?");
        } else {
            JOptionPane.showMessageDialog(testButton,
                    "You made a test, but no job is progress. Hit the \"Start work\" button and hit me again after.");
        }
    }

    private void startWork() {
        if (worker != null) {
            return;
        }
        startButton.setEnabled(false);
        worker = new SwingWorker<Void, Integer>() {

            @Override
            protected Void doInBackground() throws Exception {
                // Outside EDT, we cannot modify the UI, but we can perform lengthy operations
                // without blocking the UI
                for (int i = 0; i < 10; i++) {
                    publish(i * 10);
                    Thread.sleep(1000);
                }
                return null;
            }

            @Override
            protected void process(List<Integer> chunks) {
                // Inside EDT, here we can modify the UI
                super.process(chunks);
                // We only care about the last one
                progress.setValue(chunks.get(chunks.size() - 1));
            }

            @Override
            protected void done() {
                // Inside EDT, he we can modify the UI
                super.done();
                progress.setValue(100);
                startButton.setEnabled(true);
                worker = null;
            }

        };
        worker.execute();
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == startButton) {
            startWork();
        } else if (e.getSource() == testButton) {
            showTestDialog();
        }
    }

    public static void main(String[] args) throws ClassNotFoundException, InstantiationException, IllegalAccessException,
            UnsupportedLookAndFeelException {
        UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                new TestJFrame().initUI();
            }

        });
    }
}