To avoid breaking the 1.0.2 event behavior on a Component, I wrap that
component in a 1.1 Panel and add a listener to the Panel. I get inconsistent
results based on the layout manager that is used. I am most interested in
getting valid enter/exit notification on null layout.

I have created a test application to show the problem. To use:
- save program as main.java
% javac main.java
% java main <layout manager>
  - <layout manager> is border, grid, flow, or null
Move the mouse into and out of the "Enter/Exit" button, notice the correct
behavior for border and grid layouts and the inconsistent behavior for
flow and null layout.

I am unable to obtain enter/exit notification on components using the 1.0.2
Event model in my 1.1 tool without a fix to this bug. I believe that I can
add a mouse listener directly to the 1.0.2 Component and get proper enter/exit
notification, but this breaks the 1.0.2 event behavior permanently. I have
filed a bug report on this problem as well (4025729).

import java.applet.*;
import java.awt.*;
import java.awt.event.*;

public class main extends Applet {

static String Args[];

public static void main(String args[]) {
    Applet ctk = new main();
    Args = args;
    ctk.init();
}

public void init() {
    Frame f = new Frame();
    Panel bp = new Panel(new BorderLayout());
    Button button = new Button("Enter/Exit");
    bp.add("Center", button);
    bp.addMouseListener(new EnterExitListener());
    Panel topPanel = new Panel();
    f.add("Center", topPanel);
    if (Args.length == 0)
System.out.println("usage: java main <layout>, where layout is border, grid, or null");
    else if (Args[0].equals("border")) {
topPanel.setLayout(new BorderLayout());
f.add("Center", topPanel);
topPanel.add("West", new Button("WestDummy"));
topPanel.add("Center", bp);
topPanel.add("East", new Button("EastDummy"));
    } else if (Args[0].equals("grid")) {
topPanel.setLayout(new GridLayout(1, 3));
topPanel.add(new Button("WestDummy"));
topPanel.add(bp);
topPanel.add(new Button("EastDummy"));
    } else if (Args[0].equals("flow")) {
topPanel.setLayout(new FlowLayout());
topPanel.add(new Button("WestDummy"));
topPanel.add(bp);
topPanel.add(new Button("EastDummy"));
    } else if (Args[0].equals("null")) {
topPanel.setLayout(null);
Button wButton = new Button("WestDummy");
topPanel.add(wButton);
wButton.setLocation(0,10);
wButton.setSize(90,100);
topPanel.add(bp);
bp.setLocation(100,10);
bp.setSize(90,100);
Button eButton = new Button("EastDummy");
topPanel.add(eButton);
eButton.setLocation(200,10);
eButton.setSize(90,100);
    }
    f.setSize(new Dimension(300, 300));
    f.show();
}

public void start() {
}

public void stop() {
}

public void destroy(){
}

public void paint(Graphics g) {
}

}

class EnterExitListener implements MouseListener {

public void mouseEntered(MouseEvent e) {
    System.out.println("Mouse entered");
}

public void mouseExited(MouseEvent e) {
    System.out.println("Mouse exited");
};

public void mouseClicked(MouseEvent e) {};
public void mousePressed(MouseEvent e) {};
public void mouseReleased(MouseEvent e) {};

}