JComboBox does not fire any mouse events with Metal L&F

Name: agR10216 Date: 10/16/2002


JComboBox does not fire mouse events with Metal L&F.
The bug can be reproduced using the build 1.4.2-beta-b02
with the following test case.

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

public class JComboBoxMouseEventTest {
    static String[] lfs = { "javax.swing.plaf.metal.MetalLookAndFeel",
                            "com.sun.java.swing.plaf.motif.MotifLookAndFeel",
                            "com.sun.java.swing.plaf.windows.WindowsLookAndFeel"
                          };

    public static void main(String[] args) throws Exception {
        int i = 0;
        try {
            i = Integer.parseInt(args[0]);
        } catch (Exception exc) {}
        if (i < 0 || i > 2) {
            i = 0;
        }
        UIManager.setLookAndFeel(lfs[i]);

        JComboBox choice = new JComboBox();
        choice.addItem("Item 1");
        choice.addItem("Item 2");
        choice.addMouseListener(new MouseAdapter() {
            public void mouseClicked(MouseEvent e) {
                System.err.println(e);
            }
            public void mousePressed(MouseEvent e) {
                System.err.println(e);
            }
            public void mouseReleased(MouseEvent e) {
                System.err.println(e);
            }
            public void mouseEntered(MouseEvent e) {
                System.err.println(e);
            }
            public void mouseExited(MouseEvent e) {
                System.err.println(e);
            }
        });
        choice.addMouseMotionListener(new MouseMotionAdapter() {
            public void mouseDragged(MouseEvent e) {
                System.err.println(e);
            }
            public void mouseMoved(MouseEvent e) {
                System.err.println(e);
            }
        });

        JFrame frame = new JFrame("JComboBoxMouseEventTest");
        frame.getContentPane().setLayout(new FlowLayout());
        frame.getContentPane().add(choice);
        frame.setSize(200, 200);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }
}
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Moreover, with Windows L&F if the mouse enters the push-down
arrow and stops, then the delivered events are like these:

java.awt.event.MouseEvent[MOUSE_ENTERED,(36,20),button=0,clickCount=0] on javax.
swing.JComboBox[,70,5,51x21,layout=javax.swing.plaf.basic.BasicComboBoxUI$ComboB
oxLayoutManager,alignmentX=null,alignmentY=null,border=javax.swing.plaf.basic.Ba
sicBorders$FieldBorder@17e121c,flags=328,maximumSize=,minimumSize=,preferredSize
=,isEditable=false,lightWeightPopupEnabled=true,maximumRowCount=8,selectedItemRe
minder=Item 1]
java.awt.event.MouseEvent[MOUSE_MOVED,(36,20),button=0,clickCount=0] on javax.sw
ing.JComboBox[,70,5,51x21,layout=javax.swing.plaf.basic.BasicComboBoxUI$ComboBox
LayoutManager,alignmentX=null,alignmentY=null,border=javax.swing.plaf.basic.Basi
cBorders$FieldBorder@17e121c,flags=328,maximumSize=,minimumSize=,preferredSize=,
isEditable=false,lightWeightPopupEnabled=true,maximumRowCount=8,selectedItemRemi
nder=Item 1]
java.awt.event.MouseEvent[MOUSE_MOVED,(36,19),button=0,clickCount=0] on javax.sw
ing.JComboBox[,70,5,51x21,layout=javax.swing.plaf.basic.BasicComboBoxUI$ComboBox
LayoutManager,alignmentX=null,alignmentY=null,border=javax.swing.plaf.basic.Basi
cBorders$FieldBorder@17e121c,flags=328,maximumSize=,minimumSize=,preferredSize=,
isEditable=false,lightWeightPopupEnabled=true,maximumRowCount=8,selectedItemRemi
nder=Item 1]
java.awt.event.MouseEvent[MOUSE_EXITED,(36,18),button=0,clickCount=0] on javax.s
wing.JComboBox[,70,5,51x21,layout=javax.swing.plaf.basic.BasicComboBoxUI$ComboBo
xLayoutManager,alignmentX=null,alignmentY=null,border=javax.swing.plaf.basic.Bas
icBorders$FieldBorder@17e121c,flags=328,maximumSize=,minimumSize=,preferredSize=
,isEditable=false,lightWeightPopupEnabled=true,maximumRowCount=8,selectedItemRem
inder=Item 1]

The MOUSE_EXITED event is superfluous.

###@###.### 2002-10-16
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