Mega Code Archive

 

Categories / Java Tutorial / Swing

 

Determining When the Menu of a JComboBox Component Is Displayed

import javax.swing.JComboBox; import javax.swing.event.PopupMenuEvent; import javax.swing.event.PopupMenuListener; public class Main {   public static void main(String[] argv) throws Exception {     String[] items = { "item1", "item2" };     JComboBox cb = new JComboBox(items);     cb.setEditable(true);     MyPopupMenuListener actionListener = new MyPopupMenuListener();     cb.addPopupMenuListener(actionListener);   } } class MyPopupMenuListener implements PopupMenuListener {   public void popupMenuWillBecomeVisible(PopupMenuEvent evt) {     JComboBox cb = (JComboBox) evt.getSource();   }   public void popupMenuWillBecomeInvisible(PopupMenuEvent evt) {     JComboBox cb = (JComboBox) evt.getSource();   }   public void popupMenuCanceled(PopupMenuEvent evt) {     JComboBox cb = (JComboBox) evt.getSource();   } }