🚀 go-pugleaf

Hiroshi Nakata wrote:
> Thank you Paul for replying to my question. I am aware that all Swing/AWT
> components
> (in Container) which are entirely or partially in the dirty region will be
> automatically
> redrawn by super.paintComponent() [which is typically called at the very
> beggining
> of jpnl.paintComponent().] Therefore if no g.draw***()s are needed in jpnl,
> no need to
> call jpnl.repaint(). Your example is exactly that. But when jpnl doesn't
> have any such
> components but needs to be drawn with g.draw***(), things are different
> because
> super.paintComponent() won't draw anything but clear the panel in that case.
> I think  [...]

I'm not sure I understand what or how you are drawing -- a code
snippet of the custom component may have been more helpful.

Is the following, which does repaint correctly, close to what
you are trying to do?

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();
   JPanel specialPanel = new SpecialPanel();
   GridBagLayout gridBagLayout2 = new GridBagLayout();

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

   private void jbInit() throws Exception {
     getContentPane().setLayout(gridBagLayout1);
     jLabel1.setForeground(Color.yellow);
     jLabel1.setText("Date: ");
     quitButton.addActionListener(new ActionListener() {
       public void actionPerformed(ActionEvent actionEvent) {
         quitButton_actionPerformed(actionEvent);
       }
     });
     showButton.setOpaque(false);
     showButton.setText("Show message");
     showButton.addActionListener(new ActionListener() {
       public void actionPerformed(ActionEvent actionEvent) {
         showButton_actionPerformed(actionEvent);
       }
     });
     quitButton.setOpaque(false);
     quitButton.setText("Quit");
     specialPanel.setLayout(gridBagLayout2);
     this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     specialPanel.add(tf, new GridBagConstraints(1, 2, 2, 1, 1.0, 0.0
         , GridBagConstraints.WEST, GridBagConstraints.HORIZONTAL,
         new Insets(12, 0, 0, 11), 322, 0));
     specialPanel.add(jLabel1,
                               new GridBagConstraints(0, 2, 1, 1, 0.0, 0.0
         , GridBagConstraints.WEST, GridBagConstraints.NONE,
         new Insets(12, 12, 0, 8), 0, 0));
     specialPanel.add(quitButton,
                               new GridBagConstraints(2, 3, 1, 1, 0.0, 0.0
         , GridBagConstraints.EAST, GridBagConstraints.NONE,
         new Insets(12, 0, 11, 11), 0, 0));
     specialPanel.add(showButton,
                               new GridBagConstraints(0, 3, 2, 1, 0.0, 0.0
         , GridBagConstraints.WEST, GridBagConstraints.NONE,
         new Insets(12, 12, 11, 0), 0, 0));
     this.getContentPane().add(specialPanel,
                               new GridBagConstraints(0, 0, 1, 1, 1.0, 1.0
         , GridBagConstraints.NORTHWEST, GridBagConstraints.BOTH,
         new Insets(0, 0, 0, 0), 0, 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);
   }


   public class SpecialPanel extends JPanel {

     public SpecialPanel() {
       super();
     }

     protected void paintComponent(Graphics g) {
       super.paintComponent(g);
       Insets insets = getInsets();
       int currentWidth = getWidth() - insets.left - insets.right;
       int currentHeight = getHeight() - insets.top - insets.bottom;
       Graphics2D g2d = (Graphics2D)g.create();
       g2d.fillRect(0, 0, currentWidth, currentHeight);
       g2d.drawRect(2, 2, currentWidth - 2, currentHeight - 2);
       g2d.setColor(Color.RED);

       g2d.drawLine(3,3, currentWidth - 3, currentHeight - 3);
       g2d.drawString("Testing .................", 200, 70);
       g2d.dispose();
}

   }
}

-- 


Paul Furbacher (TeamB)

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