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import java.awt.BorderLayout;
import java.awt.Container;
import javax.swing.ComboBoxModel;
import javax.swing.DefaultComboBoxModel;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.event.PopupMenuEvent;
import javax.swing.event.PopupMenuListener;
public class PopupTest {
public static void main(String args[]) {
JFrame frame = new JFrame("Popup Menu Listener");
Container contentPane = frame.getContentPane();
final String flavors[] = { "Item 1", "Item 2", "Item 3"};
PopupMenuListener listener = new PopupMenuListener() {
boolean initialized = false;
public void popupMenuCanceled(PopupMenuEvent e) {
}
public void popupMenuWillBecomeInvisible(PopupMenuEvent e) {
}
public void popupMenuWillBecomeVisible(PopupMenuEvent e) {
if (!initialized) {
JComboBox combo = (JComboBox) e.getSource();
ComboBoxModel model = new DefaultComboBoxModel(flavors);
combo.setModel(model);
initialized = true;
}
}
};
JComboBox jc = new JComboBox();
jc.addPopupMenuListener(listener);
jc.setMaximumRowCount(4);
jc.setEditable(true);
contentPane.add(jc, BorderLayout.NORTH);
frame.pack();
frame.show();
}
}
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