Name: bsC130419 Date: 07/10/2001


java version "1.4.0-beta"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0-beta-b65)
Java HotSpot(TM) Client VM (build 1.4.0-beta-b65, mixed mode)


- start application (window appears)
- click on button (just to make sure the list doesn't have the focus)
- click on "apples"

My output (Windows 98):

1. JDK 1.4 beta
list pressed - no focus
list released - has focus

2. JDK 1.3.1
list pressed - has focus
list released - has focus

So 1.4 reports NO focus, whereas 1.3.1 reports focus on the mousePressed
event.

The component receivedthe focus BEFORE the mousePressed event in 1.3.1, whereas with 1.4 beta it receives it AFTER the mousePressed event.

While this is not a major bug, it certainly will be a backward compatibility
issue.


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

public class EventDemo extends JFrame {
  JList jList = new JList();
  JButton jButton = new JButton();


  public EventDemo() {
    this.getContentPane().setLayout(new BorderLayout());
    jList.addMouseListener(new EventDemo_jList_mouseAdapter(this));
    DefaultListModel listModel = new DefaultListModel();
    listModel.addElement("apples");
    listModel.addElement("pears");
    jList.setModel(listModel);
    jList.setPreferredSize(new Dimension(100, 70));
    this.getContentPane().add(jList, BorderLayout.CENTER);
    // the button is only added to have a place to click on in order to get
    // the focus away from the jList
    jButton.setText("Relax");
    this.getContentPane().add(jButton, BorderLayout.NORTH);
  }

  // method to exit properly; not relevant for demonstration of bug
  protected void processWindowEvent(WindowEvent e) {
    super.processWindowEvent(e);
    if(e.getID() == WindowEvent.WINDOW_CLOSING) {
      System.exit(0);
    }
  }

  public static void main(String[] args) {
    EventDemo demo = new EventDemo();
    // pack and center on screen
    demo.pack();
    Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
    demo.setLocation((screenSize.width - demo.getWidth()) / 2,
(screenSize.height - demo.getHeight()) / 2);
    demo.setVisible(true);
  }

  void jList_mousePressed(MouseEvent e) {
    if (jList.hasFocus()) {
      System.out.println("list pressed - has focus");
    } else {
      System.out.println("list pressed - no focus");
    }
  }

  void jList_mouseReleased(MouseEvent e) {
    if (jList.hasFocus()) {
      System.out.println("list released - has focus");
    } else {
      System.out.println("list released - no focus");
    }
  }



}

class EventDemo_jList_mouseAdapter extends java.awt.event.MouseAdapter {
  EventDemo adaptee;

  EventDemo_jList_mouseAdapter(EventDemo adaptee) {
    this.adaptee = adaptee;
  }

  public void mousePressed(MouseEvent e) {
    adaptee.jList_mousePressed(e);
  }

  public void mouseReleased(MouseEvent e) {
    adaptee.jList_mouseReleased(e);
  }
}
(Review ID: 127744)
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