Swing組件使用-彈出式菜單

JPopupMenu組件類似於window桌面點擊右鍵的效果，在點擊處彈出一個動態菜單。

代碼：

package org.suju.swingdemo;

import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JPopupMenu;

public class JPopupMenuDemo {
	/*
	 * frame 窗體
	 * pop 彈出菜單項
	 * more 子菜單想
	 * opentiem, helpitem 子菜單選項
	*/
	public JFrame frame;
	public JPopupMenu pop;
	public JMenu more;
	public MyMenuItem openitem;
	public MyMenuItem helpitem;
	
	//init
	public void init()
	{
		//通過數組構造菜單項，如果菜單項很多
		MyMenuItem[] items = new MyMenuItem[]{
				new MyMenuItem("File", new ImageIcon("img/new_page.png")),
				new MyMenuItem("Print", new ImageIcon("img/print.png")),
				new MyMenuItem("Exit", new ImageIcon("img/save.png")),
		};
		openitem = new MyMenuItem("Exit", new ImageIcon("img/open.png"));
		helpitem = new MyMenuItem("Exit", new ImageIcon("img/help.png"));
		//創建pop彈出式菜單，並添加所有菜單項
		pop = new JPopupMenu("pop");
		more = new JMenu("more");
		more.add(openitem);
		more.add(helpitem);
		for (MyMenuItem item: items) {
			pop.add(item);	//遍歷添加數組菜單項
		}
		pop.addSeparator();	//分隔符
		pop.add(more);
		frame = new JFrame();
		frame.setLayout(new FlowLayout());
		frame.setTitle("JPopupMenuDemo");
		frame.setBounds(500, 100, 300, 300);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

		frame.addMouseListener(new MouseAdapter() {
			/*
			 * MouseEvent.BUTTON3 代表按下鼠標右鍵
			 * pop.show(frame, e.getX(), e.getY());
			 * 在frame響應鼠標點擊出，彈出菜單
			 */
			@Override
			public void mouseClicked(MouseEvent e) {
				if (e.getButton() == MouseEvent.BUTTON3) {
					pop.show(frame, e.getX(), e.getY());
				}
			}
		});
	}
	public void show()
	{
		init();
		frame.setVisible(true);
	}
	public static void main(String[] args) {
		new JPopupMenuDemo().show();
	}
	
	/*
	 * 僅方便簡化測試
	 * 自定一個菜單項類，繼承ActionListener響應點擊事件
	 */
	class MyMenuItem extends JMenuItem implements ActionListener
	{
		private static final long serialVersionUID = 1L;
		public MyMenuItem(String string, ImageIcon imageIcon) {
			super(string, imageIcon);
			this.addActionListener(this);
		}
		//點擊響應方法
		@Override
		public void actionPerformed(ActionEvent e) {
			JOptionPane.showMessageDialog(null, e.getActionCommand());
		}
	}
}

源碼：下載