Name: boT120536 Date: 04/12/2001


java version "1.3.0"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.0-C)
Java HotSpot(TM) Client VM (build 1.3.0-C, mixed mode)

I get this problem where requestFocus() does not work for components in a
JWindow immediately after the JWindow becomes visible. I have the problem in
JDK 1.3 on Windows 2000. The problem does not appear in JDK 1.2.2. This looks
very similar to bug # 4199374, which was fixed in 1.2. The following code will
demonstrate the problem:

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

/**
 * This is a component, which can process keyboard events, shows itself in a
JWindow.
 * It is gray when it doesn't have the focus and white when it does. Click on
it to give
 * it the focus. Press Enter to pop up a new JWindow with a new component. The
new
 * component should get the focus, but it never does when it is first shown; you
have to
 * press Enter a second time. Press Escape to hide the component.
 */
public class FocusTest extends JPanel
{
   public FocusTest()
   {
      enableEvents(AWTEvent.MOUSE_EVENT_MASK | AWTEvent.KEY_EVENT_MASK);
      setBorder(BorderFactory.createLineBorder(Color.red, 3));
   }

   public Dimension getPreferredSize()
   {
      return new Dimension(100, 100);
   }

   public void processKeyEvent(KeyEvent e)
   {
      super.processKeyEvent(e);

      if (e.getID()==KeyEvent.KEY_PRESSED)
      {
         switch(e.getKeyCode())
         {
            case KeyEvent.VK_ENTER:
               showSubPanel();
               break;
            case KeyEvent.VK_ESCAPE:
               hideWindow();
               break;
            default:
               lastChar[0] = e.getKeyChar();
               repaint();
               break;
         }
      }
   }

   public void processMouseEvent(MouseEvent e)
   {
      super.processMouseEvent(e);

      if (e.getID()==MouseEvent.MOUSE_PRESSED)
      {
         if (subpanel!=null) subpanel.hideWindow();
         requestFocus();
      }
   }

   public void paintComponent(Graphics g)
   {
      setBackground(hasFocus()? Color.white : Color.gray);
      super.paintComponent(g);
      g.drawChars(lastChar, 0, 1, 50, 50);
   }

   void showSubPanel()
   {
      if (subpanel==null)
      {
         subpanel = new FocusTest();
      }
      subpanel.showWindow(this, 50, 50);
   }

   void showWindow(Component c, int x, int y)
   {
      if (window==null)
      {
         window = new JWindow();
         window.getContentPane().add(this);
         window.pack();
      }
      Point p = new Point(x, y);
      if (c!=null) SwingUtilities.convertPointToScreen(p, c);
      window.setLocation(p);
      // calling show() twice is a workaround
      // except for the very first component, I don't know why
      //window.show();
      window.show();

      // this call to requestFocus() doesn't work the first time
      requestFocus();
      repaint();
   }

   public void requestFocus()
   {
      System.out.println(Integer.toString(hashCode(), 16) + ':');
      System.out.println("\tI am " + (isVisible()? "" : "not ") + "visible.");
      // comment out for versions older than 1.3
      System.out.println("\tMy root window is " +
(SwingUtilities.getWindowAncestor(this).isVisible()? "" : "not ") + "visible.");
      super.requestFocus();
      System.out.println("\tI " + (hasFocus()? "" : "do not ") + "have the
focus.");
      repaint();
   }

   void hideWindow()
   {
      if (window!=null) window.hide();
   }
   
   private FocusTest subpanel;
   private JWindow window;
   private char[] lastChar = { ' ' };

   public static void main(String[] arg)
   {
      new FocusTest().showWindow(null, 0, 0);
   }
}
(Review ID: 120611)
======================================================================