Java JComboBox Drop Down event

Is it possible to determine开发者_开发技巧 when a user clicks on a JComboBox to drop down the list of items in it? I just want to capture this event, not when an item is selected from the list.

Many thanks,

Andez

You can use JComboxBox#addPopupMenuListener(PopupMenuListener listener)

You can use a PopupMenuListener to determine when the drop down is about to open. Add it using the: addPopupMenuListener-Method.

http://download.oracle.com/javase/6/docs/api/javax/swing/event/PopupMenuListener.html

Use this method

  void popupMenuWillBecomeVisible(PopupMenuEvent e) 

It is possible with method JComboBox.addPopupMenuListener(PopupMenuListener l).