为什么（）完成不叫，直到模式对话框关闭？

Question

在下面的例子，试图发开的工人开始对话，并关闭它在工人结束。

不幸的是，不执行done()直到对话框手动关闭。

为什么？

package tests.javax.swing; 

import java.awt.FlowLayout; 
import java.awt.event.ActionEvent; 
import java.beans.PropertyChangeEvent; 
import java.beans.PropertyChangeListener; 

import javax.swing.AbstractAction; 
import javax.swing.JButton; 
import javax.swing.JDialog; 
import javax.swing.JFrame; 
import javax.swing.JOptionPane; 
import javax.swing.SwingUtilities; 
import javax.swing.SwingWorker; 

import org.slf4j.Logger; 
import org.slf4j.LoggerFactory; 

public class Try_SwingWorker_Modality { 

    private static final Logger log = LoggerFactory.getLogger(Try_SwingWorker_Modality.class); 

    public static void main(String[] args) { 

     SwingUtilities.invokeLater(new Runnable() { 

      @Override 
      public void run() { 





       AbstractAction popupAction = new AbstractAction("popup") { 

        @Override 
        public void actionPerformed(ActionEvent e) { 
         JOptionPane.showMessageDialog(null, "popup"); 
        } 

       }; 

       final JDialog dialog = new JDialog((JFrame)null, true); 
       dialog.setLayout(new FlowLayout()); 
       dialog.add(new JButton(popupAction)); 


       dialog.pack(); 
       dialog.setLocationRelativeTo(null); 



       SwingWorker<Object,Object> swingWorker = new SwingWorker<Object,Object>() { 

        @Override 
        protected Object doInBackground() throws Exception { 
         log.debug("doInBackground()"); 
         return null; 
        } 

        @Override 
        protected void done() { 
         log.debug("done"); 
         //dialog.dispose(); 
        } 

       }; 

       swingWorker.addPropertyChangeListener(new PropertyChangeListener() { 

        @Override 
        public void propertyChange(PropertyChangeEvent evt) { 
         log.debug("event = {}", evt); 
         if("state".equals(evt.getPropertyName())) { 
          if(SwingWorker.StateValue.STARTED == evt.getNewValue()) { 
           dialog.setVisible(true); 
           log.debug("after setVisible()"); 
          } 
          else if(SwingWorker.StateValue.DONE == evt.getNewValue()) { 
           dialog.dispose(); 
          } 
         } 
        } 
       }); 


       swingWorker.execute(); 

      } 
     }); 


    } 

} 

Answer 1

您正在使用该代码冻结您的SwingWorker的PropertyChangeListener。我永远不会在PCL中设置可见的对话框。

相反，我会在这里做：

swingWorker.execute(); 
dialog.setVisible(true);