Name: joT67522 Date: 12/08/97


The code below illustrates the problem. Take any two
components and add a mouselistener for enter and
exit events for each component. Place the components
in a container such that they are adjoining.
As the mouse exits component A and enters component
B, the mouse entered event for component B gives the
coordinate at which the mouse exited for component
A.

NB. this is a serious problem in drawing applications.

Here is some code:
/*
 * This applet demonstrates a bug with the mouse entered event.
 * Two panels are placed side by side. When the mouse moves across the
 * border between the panels, a mouse exit event is generated and then
 * an entered event.
 * Note that the coordinate for both is the same - the coordinate for
 * the mouse entered event should be the point at which the mouse
 * entered the panel, not the point at which the mouse exited the
 * adjoining panel.
 *
 * Channing Walton
 * ###@###.###
 */

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

public class Applet1 extends Applet
{
public void init()
{

setLayout(null);
panel1 = new java.awt.Panel();
panel1.setBounds(0,0,100,100);
panel1.setBackground(new Color(12632256));
add(panel1);
panel2 = new java.awt.Panel();
panel2.setBounds(100,0,100,100);
panel2.setBackground(new Color(16756655));
add(panel2);

SymMouse aSymMouse = new SymMouse();
panel1.addMouseListener(aSymMouse);
panel2.addMouseListener(aSymMouse);
}

java.awt.Panel panel1;
java.awt.Panel panel2;

class SymMouse extends java.awt.event.MouseAdapter
{
public void mouseExited(java.awt.event.MouseEvent event)
{
System.out.println("Exit: " + event.getPoint());
}

public void mouseEntered(java.awt.event.MouseEvent event)
{
System.out.println("Entered: " + event.getPoint());
}
}
}
(Review ID: 21532)
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