java - 更新 JLabel 在 SwingWorker 线程内的行为不正常

Question

我正在尝试以某些预期行为更新 JLabel，例如 -

条件 1:JLabel 应显示 5 秒，然后在接下来的 3 秒内不可见，然后应显示 5 秒，依此类推。

条件 2:JLabel 应显示 0.5 秒，然后在接下来的 3 秒内不可见。

任何排列组合的种类，行为应该有效。以下是示例代码-

import java.awt.LayoutManager;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.List;

import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingWorker;

public class Main
{
    static CounterTask task;

    public static void main ( String[] args )
    {

        final JLabel label = new JLabel( "TEST ME " );
        JButton startButton = new JButton( "Start" );
        startButton.addActionListener( new ActionListener()
        {
            public void actionPerformed ( ActionEvent e )
            {
                task = new CounterTask( label );
                task.execute();
            }
        } );

        JButton cancelButton = new JButton( "Cancel" );
        cancelButton.addActionListener( new ActionListener()
        {
            public void actionPerformed ( ActionEvent e )
            {
                task.cancel( true );
            }
        } );

        JPanel buttonPanel = new JPanel();
        buttonPanel.add( startButton );
        buttonPanel.add( cancelButton );

        JPanel cp = new JPanel();
        LayoutManager layout = new BoxLayout( cp, BoxLayout.Y_AXIS );
        cp.setLayout( layout );
        cp.add( buttonPanel );
        cp.add( label );

        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
        frame.setContentPane( cp );
        frame.pack();
        frame.setVisible( true );
    }
}

class CounterTask
    extends SwingWorker< Integer, Integer >
{
    int DELAY = 3000;

    JLabel label;

    int WAIT = 5000;

    public CounterTask ( JLabel label )
    {
        this.label = label;
    }

    @Override
    protected Integer doInBackground () throws Exception
    {
        int i = 0;
        int count = 1000;
        while ( !isCancelled() && i < count )
        {
            i++;
            publish( new Integer[] { i } );
            label.setVisible( false );
            Thread.sleep( DELAY );
        }
        return count;
    }

    protected void process ( List< Integer > chunks )
    {
        Integer strContent = chunks.get( chunks.size() - 1 );
        label.setVisible( true );
        label.validate();
        label.setText( "DISPLAYING " + strContent );
        try
        {
            Thread.sleep( WAIT );
        }
        catch ( InterruptedException e )
        {
            e.printStackTrace();
        }
    }

    @Override
    protected void done ()
    {
        if ( isCancelled() )
            System.out.println( "Cancelled !" );
        else
            System.out.println( "Done !" );
    }
}

我肯定做错了什么，因为这种组合适用于某些数据并且大部分 JLabel 在整个过程中变得不可见，但如果我放置 SOP，我会在适当的延迟和等待时间获得正确的数据。

Swing worker 的上述代码有两个变量 WAIT , DELAY 。WAIT 使 JLabel 可见 X 秒，DELAY 使 JLAbel 不可见 Y 秒。但是，如果尝试使用不同的烫发和梳理，您会发现 JLabel 可见性无法按预期工作。这可能是因为标签的 EDT 更新或与重绘有关。不确定根本原因。

预期:

1. Want to make the code work like SOP working or in ideal case.
2. Need to know the reason of not behaving properly.

Answer 1

SwingWorker 对于一个闪烁的标签来说是一个大材小用。尝试以下基于计时器的方法，它根本不需要线程魔法:

public class Main {
private static Timer setVisibleTimer;
private static Timer setInvisibleTimer;

public static void main(String[] args) {

    final JLabel label = new JLabel("TEST ME ");
    JButton startButton = new JButton("Start");
    startButton.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            setVisibleTimer = new Timer(8000, new ActionListener() {
                @Override
                public void actionPerformed(ActionEvent e) {
                    label.setVisible(true);
                }
            });
            setInvisibleTimer = new Timer(5000, new ActionListener() {
                @Override
                public void actionPerformed(ActionEvent e) {
                    label.setVisible(false);
                }
            });
            setVisibleTimer.start();
            setInvisibleTimer.start();
        }
    });

    JButton cancelButton = new JButton("Cancel");
    cancelButton.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            label.setVisible(true);
            if (setVisibleTimer != null){
                setInvisibleTimer.stop();
                setVisibleTimer.stop();
            }
        }
    });

    JPanel buttonPanel = new JPanel();
    buttonPanel.add(startButton);
    buttonPanel.add(cancelButton);

    JPanel cp = new JPanel();
    LayoutManager layout = new BoxLayout(cp, BoxLayout.Y_AXIS);
    cp.setLayout(layout);
    cp.add(buttonPanel);
    cp.add(label);

    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setContentPane(cp);
    frame.pack();
    frame.setVisible(true);
}
}