JDialog 停止执行父 JFrame [英] JDialog Stops execution of parent JFrame

问题描述

我有一个 gif 动画图像，它在 jDialog 中显示无限循环加载进度...但问题是当我加载这个 jDialog 时，父框架代码停止了.?如何做到这一点..这是我的代码..

I have a gif animation image that is showing infinite circle loading progress inside a jDialog...But problem is when i load this jDialog the parent frame codes is halt.? how to do this..here is my code..

ProgressDialouge pbDialog = new ProgressDialouge(this);
pbDialog.setVisible(true);
pbDialog.toFront();
postPairs.add(new BasicNameValuePair("PATH","authenticateUser.idoc"));
postPairs.add(new BasicNameValuePair("user_email",email));
postPairs.add(new BasicNameValuePair("user_password",password));
JSONArray jArray = asyncService.sendRequest(postPairs);
 if(jArray != null){
            new NewJFrame().setVisible(true);

            this.setVisible(false);
  }

如果我更改我的 JDiaog 的 ModalityType.MODELESS，它不会停止代码的执行，但它也不会显示进度条..

if i change my JDiaog's ModalityType.MODELESS than it does't stop the execution of code but it's also not showing the progress bar..

推荐答案

很可能你遇到了一个线程问题，你在 Swing 事件线程上运行一个长时间运行的任务，阻止事件线程更新图形用户界面.解决方案是使用后台线程，例如 SwingWorker 提供的线程.

In all likelihood you've got a threading issue where you're running a long-running task on the Swing event thread, preventing the event thread from updating the GUI. The solution is to use a background thread such as one provided by a SwingWorker.

我的猜测是有问题的那一行:

My guess is that the offending line is this one:

JSONArray jArray = asyncService.sendRequest(postPairs);

同样，在后台线程中执行此操作.有关更多信息，请查看此链接:Swing 中的并发

So again, do this in a background thread. For more on this, please check out this link: Concurrency in Swing

例如:

import java.awt.Point;
import java.awt.Window;
import java.awt.event.ActionEvent;

import javax.swing.*;

public class ShowSwingWorker {
   private JPanel mainPanel = new JPanel();
   private JButton myBtn = null;
   private ProgressDialouge pbDialog = null;

   public ShowSwingWorker() {
      myBtn = new JButton(new AbstractAction("Push Me") {

         @Override
         public void actionPerformed(ActionEvent evt) {
            JButton source = (JButton) evt.getSource();
            source.setEnabled(false); // disable button
            Window win = SwingUtilities.getWindowAncestor(source);
            new MySwingWorker().execute(); // start background thread

            if (pbDialog == null) {
               pbDialog = new ProgressDialouge(win);               
               pbDialog.pack();
               pbDialog.setLocationRelativeTo(win);
               Point loc = pbDialog.getLocation();
               pbDialog.setLocation(loc.x - 100, loc.y - 100);
            }
            pbDialog.setVisible(true);
            // pbDialog.toFront();
         }
      });

      mainPanel.add(myBtn);
   }

   public JComponent getMainPanel() {
      return mainPanel;
   }

   private class MySwingWorker extends SwingWorker<Void, Void> {
      @Override
      protected Void doInBackground() throws Exception {
         Thread.sleep(4000); // emulate a long-running task

         // postPairs.add(new BasicNameValuePair("PATH",
         // "authenticateUser.idoc"));
         // postPairs.add(new BasicNameValuePair("user_email", email));
         // postPairs.add(new BasicNameValuePair("user_password", password));
         // JSONArray jArray = asyncService.sendRequest(postPairs);
         // if (jArray != null) {
         // new NewJFrame().setVisible(true);
         //
         // this.setVisible(false);
         // }
         return null;
      }

      @Override
      protected void done() {
         // Here you change your display.
         // you were swapping JFrames, but I recommend that you instead change views.
         myBtn.setEnabled(true);
         pbDialog.setVisible(false);
      }
   }

   private class ProgressDialouge extends JDialog {

      public ProgressDialouge(Window win) {
         super(win, "MyDialog", ModalityType.APPLICATION_MODAL);
         JProgressBar pBar = new JProgressBar();
         pBar.setIndeterminate(true);
         add(pBar);
      }

   }

   private static void createAndShowGUI() {
      ShowSwingWorker paintEg = new ShowSwingWorker();

      JFrame frame = new JFrame("ShowSwingWorker");
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.getContentPane().add(paintEg.getMainPanel());
      frame.pack();
      frame.setLocationRelativeTo(null);
      frame.setVisible(true);
   }

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

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