🚀 go-pugleaf

Does this do what you want -- a value is updated after
closing a message pane?

package repaint_issue;

import java.util.*;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

/** Shows that you don't have to do anything to update
  * the UI after showing a JOptionPane.showXXXDialog()
   */
public class Frame1
     extends JFrame {


   JLabel jLabel1 = new JLabel();
   JTextField tf = new JTextField();
   GridBagLayout gridBagLayout1 = new GridBagLayout();
   JButton quitButton = new JButton();
   JButton showButton = new JButton();


   public Frame1() {
     try {
       jbInit();
     }
     catch (Exception exception) {
       exception.printStackTrace();
     }
   }

   private void jbInit() throws Exception {
     getContentPane().setLayout(gridBagLayout1);
     jLabel1.setText("Date: ");
     quitButton.addActionListener(new ActionListener() {
       public void actionPerformed(ActionEvent actionEvent) {
         quitButton_actionPerformed(actionEvent);
       }
     });
     showButton.setText("Show message");
     showButton.addActionListener(new ActionListener() {
       public void actionPerformed(ActionEvent actionEvent) {
         showButton_actionPerformed(actionEvent);
       }
     });
     quitButton.setText("Quit");
     this.getContentPane().add(showButton,
                               new GridBagConstraints(0, 2, 2, 1, 0.0, 0.0
         , GridBagConstraints.WEST, GridBagConstraints.NONE,
         new Insets(12, 12, 11, 0), 0, 0));
     this.getContentPane().add(quitButton,
                               new GridBagConstraints(2, 2, 1, 1, 0.0, 0.0
         , GridBagConstraints.EAST, GridBagConstraints.NONE,
         new Insets(12, 0, 11, 11), 0, 0));
     this.getContentPane().add(jLabel1,
                               new GridBagConstraints(0, 1, 1, 1, 0.0, 0.0
         , GridBagConstraints.WEST, GridBagConstraints.NONE,
         new Insets(12, 12, 0, 8), 0, 0));
     this.getContentPane().add(tf, new GridBagConstraints(1, 1, 2, 1, 
1.0, 0.0
         , GridBagConstraints.WEST, GridBagConstraints.HORIZONTAL,
         new Insets(12, 0, 0, 11), 322, 0));
   }

   public static void main(String[] args) {
     Frame1 frame1 = new Frame1();
     frame1.pack();
     frame1.setVisible(true);
   }

   public void quitButton_actionPerformed(ActionEvent actionEvent) {
     System.exit(0);
   }

   public void showButton_actionPerformed(ActionEvent actionEvent) {
     String date = new Date().toString();
     JOptionPane.showMessageDialog(this, "A message" + date);
     tf.setText(date);
   }
}

If so, you don't have to invoke any kind of repaint or update.


Hiroshi Nakata wrote:
> When a Java app calls repaint() after JOptionPane.show***Dialog(),
> the repaint() is ignored because closing the dlg triggers a repaint() from
> the system, and the Java "drawing system" skips the 1st request (from the
> Java app) and executes only the 2nd (from the system).
> 
> This leaves some region unmodified in a panel (to which repaint() is
> triggered)
> because the repaint() from the system repaints only 'dirty' region (ie
> region
> covered  by the dlg). Here is a situation:
> 
> 1)call repaint() to draw into a JPanel, jpnl, ie in jpnl.paintComponent(),
>     g.draw***() are called.
> 2)call JOptionPane.show***Dialog() which is covering jpnl.
> 3)close the dlg, triggering jpnl.repaint() by the system
> 4)set some change (according to the inputs in the dlg) into effects in jpnl
>    when drawn (such as new lines added)
> 5)call jpnl.repaint() to see the change.
> 
> Result is that 5) is not executed by the "drawing system" because of the
> same call, jpnl.repaint(), in 3).
> 
> How can we force the "drawing system" not to skip consecutive repaint()
> calls?
> Or am I missing something?


-- 


Paul Furbacher (TeamB)

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