Question

我已经制作了自己的SwingWorker示例，以熟悉它的工作原理。

我想要做的是以下内容：单击按钮时，我想要一个进度条，直到任务完成为止我想简单地删除进度条并在对话框中添加一个字符串。

单击该按钮时，进度条会出现，但永远不会消失。（永远不会在10秒后删除进度条，并且永远不会放置标签）

这是一个SSCCE：

package swingtesting;

import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JProgressBar;
import javax.swing.SwingWorker;

public class SwingTesting {

    /**
     * Creates a frame that will hold a simple button to make use of SwingWorker
     */
     public static void main(String[] args) {
         // TODO code application logic here
         JFrame frame = new JFrame();
         JButton button = new JButton();

         button.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                new GuiWorker().execute();
            }
         });
         button.setText("Test Me");
         frame.getContentPane().add(button);
         frame.pack();
         frame.setVisible(true);
    }
}

class GuiWorker extends SwingWorker<Integer, Integer> {

    /*
     * This should just create a frame that will hold a progress bar until the
     * work is done. Once done, it should remove the progress bar from the dialog
     * and add a label saying the task complete.
     */

    private JFrame frame = new JFrame();
    private JDialog dialog = new JDialog(frame, "Swingworker test", true);
    private JProgressBar progressBar = new JProgressBar();


    public GuiWorker() {
        progressBar.setString("Waiting on time");
        progressBar.setStringPainted(true);
        progressBar.setIndeterminate(true);
        dialog.getContentPane().add(progressBar);
        dialog.pack();
        dialog.setVisible(true);
    }

    @Override
    protected Integer doInBackground() throws Exception {
        Thread.sleep(10000);
        return 0;
    }

    @Override
    protected void done() {
        JLabel label = new JLabel("Task Complete");
        dialog.getContentPane().remove(progressBar);
        dialog.getContentPane().add(label);
    }

}

Answer 1

这是您的代码的更新版本

import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JProgressBar;
import javax.swing.SwingWorker;

public class SwingTesting {

  public static void main(String[] args) {
    EventQueue.invokeLater( new Runnable() {
      @Override
      public void run() {
        JFrame frame = new JFrame();
        JButton button = new JButton();
        button.addActionListener(new ActionListener() {
          @Override
          public void actionPerformed(ActionEvent e) {
            new GuiWorker().execute();
          }
        });
        button.setText("Test Me");
        frame.getContentPane().add(button);
        frame.pack();
        frame.setVisible(true);
      }
    } );

  }
}

class GuiWorker extends SwingWorker<Integer, Integer> {

  /*
  * This should just create a frame that will hold a progress bar until the
  * work is done. Once done, it should remove the progress bar from the dialog
  * and add a label saying the task complete.
  */

  private JFrame frame = new JFrame();
  private JDialog dialog = new JDialog(frame, "Swingworker test", true);
  private JProgressBar progressBar = new JProgressBar();


  public GuiWorker() {
    progressBar.setString("Waiting on time");
    progressBar.setStringPainted(true);
    progressBar.setIndeterminate(true);
    dialog.getContentPane().add(progressBar);
    dialog.pack();
    dialog.setModal( false );
    dialog.setVisible(true);
  }

  @Override
  protected Integer doInBackground() throws Exception {
    System.out.println( "GuiWorker.doInBackground" );
    Thread.sleep(1000);
    return 0;
  }

  @Override
  protected void done() {
    System.out.println("done");
    JLabel label = new JLabel("Task Complete");
    dialog.getContentPane().remove(progressBar);
    dialog.getContentPane().add(label);
    dialog.getContentPane().validate();
  }

}

关键是设置模型对话框可见块，直到对话框被释放。因此，当您切换组件时，使其非模态修复它+内容窗格上的validate调用。我还调整了你的主要方法在EDT上运行，并添加了一些System.out调用。如果您删除setModal( false )调用，则在关闭对话框

之前，您将看到不会打印这些语句

Answer 2

没有必要使对话非模态。只需在启动SwingWorker后显示对话框。这可以通过调用类，执行SwingWorker的那个，首先调用execute，然后显示对话框，或者可以从SwingWorker完成，但是如果来自后者，你必须自己创建伪执行方法，调用超级执行，然后显示对话框。请注意，您不能覆盖execute（）本身，因为它是最终的。

例如......

import java.awt.CardLayout;
import java.awt.Window;
import java.awt.Dialog.ModalityType;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.util.concurrent.ExecutionException;

import javax.swing.*;

@SuppressWarnings("serial")
public class SwingTesting2 {

   private static void createAndShowGui() {
      final JFrame frame = new JFrame("SwingTesting2");
      final JDialog dialog = new JDialog(frame, "Dialog",
            ModalityType.APPLICATION_MODAL);
      final DialogPanel dialogPanel = new DialogPanel();
      dialog.getContentPane().add(dialogPanel.getMainPanel());
      dialog.pack();
      dialog.setLocationRelativeTo(frame);

      JButton button = new JButton(new AbstractAction("Test Me") {

         @Override
         public void actionPerformed(ActionEvent actEvt) {
            final GuiWorker2 guiWorker = new GuiWorker2();
            guiWorker.addPropertyChangeListener(new PropertyChangeListener() {

               @Override
               public void propertyChange(PropertyChangeEvent pcEvt) {
                  if (pcEvt.getPropertyName().equals("state")) {
                     if (pcEvt.getNewValue() == SwingWorker.StateValue.DONE) {
                        try {
                           dialogPanel.done(guiWorker.get());
                        } catch (InterruptedException e) {
                           e.printStackTrace();
                        } catch (ExecutionException e) {
                           e.printStackTrace();
                        }
                     }
                  } else if (pcEvt.getPropertyName().equals("progress")) {
                     dialogPanel.setProgress((Integer)pcEvt.getNewValue());
                  }
               }
            });

            guiWorker.execute();
            dialogPanel.start();
            dialog.setVisible(true);
         }
      });

      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.getContentPane().add(button);
      frame.pack();
      frame.setLocationByPlatform(true);
      frame.setVisible(true);
   }

   public static void main(String[] args) {
      SwingUtilities.invokeLater(new Runnable() {
         public void run() {
            createAndShowGui();
         }
      });
   }
}

class GuiWorker2 extends SwingWorker<Integer, Integer> {
   private static final int MAX_COUNT = 20;
   private static final long SLEEP_TIME = 100;
   private int count = 0;

   @Override
   protected Integer doInBackground() throws Exception {
      while (count < MAX_COUNT) {
         Thread.sleep(SLEEP_TIME);
         count++;
         setProgress((100 * count) / MAX_COUNT);
      }
      return count;
   }
}

@SuppressWarnings("serial")
class DialogPanel {
   public static final String PROGRESS_BAR = "Progress Bar";
   public static final String DONE = "Done";
   private static final int TIMER_DELAY = 2000;
   private CardLayout cardLayout = new CardLayout();
   private JPanel mainPanel = new JPanel(cardLayout);
   private JLabel doneLabel = new JLabel("Done", JLabel.CENTER);
   private JProgressBar progressBar = new JProgressBar();

   public DialogPanel() {
      progressBar.setString("Waiting on time");
      progressBar.setStringPainted(true);
      progressBar.setIndeterminate(false);

      mainPanel.add(progressBar, PROGRESS_BAR);
      mainPanel.add(doneLabel, DONE);
   }

   public void setProgress(Integer newValue) {
      progressBar.setValue(newValue);
   }

   public void start() {
      cardLayout.show(mainPanel, PROGRESS_BAR);
      progressBar.setValue(0);
   }

   public void done(int countValue) {
      doneLabel.setText(DONE + ". Count: " + countValue);
      cardLayout.show(mainPanel, DONE);
      new Timer(TIMER_DELAY, new ActionListener() {

         @Override
         public void actionPerformed(ActionEvent e) {
            Window win = SwingUtilities.getWindowAncestor(mainPanel);
            win.dispose();
         }
      }){{setRepeats(false);}}.start();
   }

   public JPanel getMainPanel() {
      return mainPanel;
   }

}

如何让我的SwingWorker示例正常工作？

2 个答案: