Determining When the Menu of a JComboBox Component Is Displayed : ComboBox « Swing JFC « Java






  1. Java
  2. Swing JFC
  3. ComboBox

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();
  }
}








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