使用PopupMenuListener : 弹出菜单事件监听 « Swing事件


import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JMenuItem;

import javax.swing.JPopupMenu;

import javax.swing.event.PopupMenuEvent;

import javax.swing.event.PopupMenuListener;



// Define PopupMenuListener

class MyPopupMenuListener implements PopupMenuListener {

  public void popupMenuCanceled(PopupMenuEvent popupMenuEvent) {

    System.out.println("Canceled");

  }



  public void popupMenuWillBecomeInvisible(PopupMenuEvent popupMenuEvent) {

    System.out.println("Becoming Invisible");

  }



  public void popupMenuWillBecomeVisible(PopupMenuEvent popupMenuEvent) {

    System.out.println("Becoming Visible");

  }

}



public class PopupMenuListenerDemo {

  public static void main(final String args[]) {

    JFrame frame = new JFrame("PopupSample Example");

    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    // Create popup menu, attach popup menu listener

    JPopupMenu popupMenu = new JPopupMenu("Title");

    PopupMenuListener popupMenuListener = new MyPopupMenuListener();



    popupMenu.addPopupMenuListener(popupMenuListener);



    // Cut

    JMenuItem cutMenuItem = new JMenuItem("Cut");

    popupMenu.add(cutMenuItem);



    // Copy

    JMenuItem copyMenuItem = new JMenuItem("Copy");

    popupMenu.add(copyMenuItem);

    // Paste

    JMenuItem pasteMenuItem = new JMenuItem("Paste");

    pasteMenuItem.setEnabled(false);

    popupMenu.add(pasteMenuItem);



    // Separator

    popupMenu.addSeparator();



    // Find

    JMenuItem findMenuItem = new JMenuItem("Find");

    popupMenu.add(findMenuItem);

    JButton label = new JButton();

    frame.add(label);

    label.setComponentPopupMenu(popupMenu);



    frame.setSize(350, 250);

    frame.setVisible(true);

  }

}
使用PopupMenuListener : 弹出菜单事件监听 « Swing事件 « Java 教程
