Name: ssT124754 Date: 02/28/2001



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)

Creating a GUI component under the cursor does not fire the mouseEntered()
trigger on the MouseListeners of this new component directly. The trigger
does fire however, when the mouse is moved. I would understand if the
trigger does not fire at all, but too late is unacceptable.
Below is an example illustrating this problem: click on the label to
produce a new instance of the label. I tried to find this bug in the Sun bug
database, and the nearest hit I could find is bug report 4027025 (Creating a
new component under cursor causes me to lose mouse motion events) with
status "Closed, not reproducable"
The code contains a bonus bug: uncommenting the comment and the text will be
displayed over previous text.

Greetings,

Mark Scheffer.

/* TestMouseMove 1.0 2001/02/21 */

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

public class TestMouseMove extends MouseInputAdapter {

    public static void main(java.lang.String[] args) {
new TestMouseMove();
    }

    JFrame f;
    JPanel p = new JPanel();
    JLabel label;

    public TestMouseMove() {

        f = new JFrame();
        f.setContentPane(p);
        newButton();
        f.pack();
f.setVisible(true);
    }

    public void newButton() {
        label = new JLabel("Not on label");
        label.addMouseListener(this);
        label.addMouseMotionListener(this);
        p.removeAll();
        p.add(label);
        p.revalidate();
//f.setContentPane(label);
    }

    public void mousePressed(MouseEvent e) {
        label.setText("New label...");
    }

    public void mouseReleased(MouseEvent e) {
        newButton();
    }

    public void mouseEntered(MouseEvent e) {
        System.out.println("ENTER");
        label.setText("On label");
    }
 
    public void mouseExited(MouseEvent e) {
        System.out.println("EXIT");
        label.setText("Not on label");
    }
    
    public void mouseDragged(MouseEvent e) { }
    public void mouseMoved(MouseEvent e) { }
}
/* end */
(Review ID: 117431)
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