我自定义我的 JComboBox 如下。该程序在默认 LAF 下运行正常，但每当我将 LAF 更改为 System LAF（另一个 LAF，Nimbus 也可以）时，单击按钮后就会出现无限循环。我看到actionPerformed方法被无限调用了。
请帮我解决这个问题。我使用 jdk 1.6.0_33
如果有任何不清楚的意思，我很抱歉。我的英语不好
提前谢谢。
package sig.dw.ui;
import java.awt.Component;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.ComboBoxEditor;
import javax.swing.DefaultComboBoxModel;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
//import javax.swing.event.EventListenerList;
/**
*
* @author congnh
*/
public class ButtonableComboBox extends JComboBox{
private ButtonableComboBoxEditor comboBoxEditor;
public ButtonableComboBox(){
super();
comboBoxEditor = new ButtonableComboBoxEditor();
// eventListenerList = new EventListenerList();
setEditable(true);
setEditor(comboBoxEditor);
}
public ButtonableComboBox(Object[] items){
this();
setModel(new DefaultComboBoxModel(items));
}
public void addButtonListener(ActionListener listener){
comboBoxEditor.addActionListener(listener);
}
public void removeButtonListener(ActionListener listener){
comboBoxEditor.removeActionListener(listener);
}
class ButtonableComboBoxEditor implements ComboBoxEditor{
private JButton button;
public ButtonableComboBoxEditor(){
button = new JButton();
}
@Override
public Component getEditorComponent() {
return button;
}
@Override
public void setItem(Object anObject) {
if(anObject!=null){
button.setText(anObject.toString());
}
}
@Override
public Object getItem() {
return button.getText();
}
@Override
public void selectAll() {
throw new UnsupportedOperationException("Not supported yet.");
}
@Override
public void addActionListener(ActionListener l) {
System.out.println("add new listener");
button.addActionListener(l);
}
@Override
public void removeActionListener(ActionListener l) {
button.removeActionListener(l);
}
}
public static void main(String args[]){
javax.swing.SwingUtilities.invokeLater(new Runnable(){
@Override
public void run(){
String[] comboBoxItems = {"Browse","Explorer","Firefox","IE","Chrome","Opera"};
JFrame frame = new JFrame();
JPanel panel = new JPanel();
panel.setLayout(new FlowLayout());
ButtonableComboBox bcb = new ButtonableComboBox(comboBoxItems);
bcb.addButtonListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
System.out.println(e.getActionCommand());
}
});
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
panel.add(bcb);
frame.add(panel);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
}