doInBackground完成后显示ProgressMonitor

Question

我正在尝试使用ProgressMonitor更新用户，并提供取消操作的选项。

这是我正在从HD读取图形图像的SwingWorker类。 po.getThumbNail（）使用ImageIO.read（...）;这很费时间。

public class BuildArray extends SwingWorker<Object[][], Void>
{
    private ArrayList<PhotoObject> files;
    private Object[][] array;
    private ImageIcon broken;

    private int row;
    private int column;

    public BuildArray(ArrayList<PhotoObject> files, ImageIcon broken)
    {
        this.files = files;
        this.broken = broken;
        column = PhotoObject.HEADER.length;
        array = new Object[files.size()][column];
    }



    @Override
    protected Object[][] doInBackground() throws Exception
    {
        row = 0;
        setProgress(0);
        //System.out.println("SwingWorker: " + javax.swing.SwingUtilities.isEventDispatchThread());
        for (PhotoObject pO : files)
        {
            array[row][0] = pO.getFile();
            array[row][1] = pO.getStatus();
            array[row][2] = pO.getSearchWords();
            if (pO.getThumbNail() == null)
                array[row][3] = broken;
            else
                array[row][3] = new ImageIcon(pO.getThumbNail());
            row++;

            int current = row * 100 / files.size();

            //publish(row);
            setProgress(current);

            if (isCancelled())
                trimArray();
        }
        return array;
    }
}

这是“ Manager”类，用于实例化SwingWorker对象，并将Object [] []返回到GUI类，该GUI类将在JTable中显示结果。 Manager会将对SwingWorker类的引用传递回GUI进行观看。

public class PhotoManager extends Thread implements IFunctions
{
    private Object [][] build2DArray(ArrayList<PhotoObject> files, boolean showMonitor)
    {
        BuildArray buildArray = new BuildArray(files, BROKEN);

        if (showMonitor)            
            monitor.startMonitor(buildArray, 0, files.size());

        //System.out.println("PhotoManager: " + javax.swing.SwingUtilities.isEventDispatchThread());

        buildArray.execute();

        Object[][] array = null;
        try
        {
            array = buildArray.get();
        }
        catch (InterruptedException | ExecutionException e)
        {
            array = buildArray.getArray();
        }

        return array;
    }
}

这是试图显示ProgressMonitor的GUI类。

public class MainWindow extends JFrame implements ActionListener, IReDraw, PropertyChangeListener, IProgressMonitor
{
    @Override
    public void startMonitor(SwingWorker<Object[][], Void> sw, int min, int max)
    {
        swingWorker = sw;
        swingWorker.addPropertyChangeListener(this);

        monitor = new ProgressMonitor(this, null, "Processing...", min, max);
    }

    @Override
    public void propertyChange(PropertyChangeEvent evt)
    {
        if (evt.getPropertyName().equals("progress"))
        {
            //int x = (Integer) evt.getNewValue();
            int x = swingWorker.getProgress();
            monitor.setProgress(x);
        }
    }

因此，当我运行此命令时，只有在doInBackground（）方法完成后才调用propertyChange（）方法。因此，仅在SwingWorker完成后才显示ProgressMonitor，这毫无意义。据我所知，GUI和Manager类都在EDT上运行。

我认为，我只包括了相关的方法。我一直在这里和其他站点上查看ProgressMonitor和SwingWorker的示例。我不知道为什么它对我不起作用。