Java JPopupMenu _JavaSwing

本文概述

JPopupMenu类声明
Java JPopupMenu示例
带有MouseListener和ActionListener的Java JPopupMenu示例

PopupMenu可以在组件内的特定位置动态弹出。它继承了JComponent类。
JPopupMenu类声明 【Java JPopupMenu】我们来看一下javax.swing.JPopupMenu类的声明。

public class JPopupMenu extends JComponent implements Accessible, MenuElement

常用的构造函数：

建设者	描述
JPopupMenu()	构造一个不带“调用程序”的JPopupMenu。
JPopupMenu(String label)	构造具有指定标题的JPopupMenu。

Java JPopupMenu示例

import javax.swing.*; import java.awt.event.*; class PopupMenuExample { PopupMenuExample(){ final JFrame f= new JFrame("PopupMenu Example"); final JPopupMenu popupmenu = new JPopupMenu("Edit"); JMenuItem cut = new JMenuItem("Cut"); JMenuItem copy = new JMenuItem("Copy"); JMenuItem paste = new JMenuItem("Paste"); popupmenu.add(cut); popupmenu.add(copy); popupmenu.add(paste); f.addMouseListener(new MouseAdapter() { public void mouseClicked(MouseEvent e) { popupmenu.show(f , e.getX(), e.getY()); } }); f.add(popupmenu); f.setSize(300, 300); f.setLayout(null); f.setVisible(true); } public static void main(String args[]) { new PopupMenuExample(); }}

输出：

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带有MouseListener和ActionListener的Java JPopupMenu示例

import javax.swing.*; import java.awt.event.*; class PopupMenuExample { PopupMenuExample(){ final JFrame f= new JFrame("PopupMenu Example"); final JLabel label = new JLabel(); label.setHorizontalAlignment(JLabel.CENTER); label.setSize(400, 100); final JPopupMenu popupmenu = new JPopupMenu("Edit"); JMenuItem cut = new JMenuItem("Cut"); JMenuItem copy = new JMenuItem("Copy"); JMenuItem paste = new JMenuItem("Paste"); popupmenu.add(cut); popupmenu.add(copy); popupmenu.add(paste); f.addMouseListener(new MouseAdapter() { public void mouseClicked(MouseEvent e) { popupmenu.show(f , e.getX(), e.getY()); } }); cut.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e) { label.setText("cut MenuItem clicked."); } }); copy.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e) { label.setText("copy MenuItem clicked."); } }); paste.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e) { label.setText("paste MenuItem clicked."); } }); f.add(label); f.add(popupmenu); f.setSize(400, 400); f.setLayout(null); f.setVisible(true); } public static void main(String args[]) { new PopupMenuExample(); } }

输出：