弹出菜单(JPopupMenu
在)表示可以在组件内的指定位置动态弹出的菜单。
类声明
以下是javax.swing.JPopupMenu
类的声明 -
public class JPopupMenu
extends JComponent
implements Accessible, MenuElement
类构造函数
编号 | 构造函数 | 描述说明 |
---|---|---|
1 | JPopupMenu() |
构造一个没有参数的JPopupMenu 。 |
2 | JPopupMenu(String label) |
构造具有指定标题的JPopupMenu 。 |
类方法
以下是Swing JPopupMenu类中的方法列表。
方法继承
该类继承以下类中的方法 -
javax.swing.JComponent
java.awt.Container
java.awt.Component
java.lang.Object
JPopupMenu示例
使用编辑器创建以下Java程序:JPopupMenuDemo.java
package com.yiibai.menu;
import java.awt.*;
import java.awt.event.*;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JPopupMenu;
public class JPopupMenuDemo{
private JFrame mainFrame;
private JLabel headerLabel;
private JLabel statusLabel;
private JPanel controlPanel;
public JPopupMenuDemo(){
prepareGUI();
}
public static void main(String[] args){
JPopupMenuDemo swingMenuDemo = new JPopupMenuDemo();
swingMenuDemo.showPopupMenuDemo();
}
private void prepareGUI(){
mainFrame = new JFrame("Java SWING JPopupMenuDemo(yiibai.com)");
mainFrame.setSize(400,400);
mainFrame.setLayout(new GridLayout(3, 1));
headerLabel = new JLabel("",JLabel.CENTER );
statusLabel = new JLabel("",JLabel.CENTER);
statusLabel.setSize(350,100);
mainFrame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent windowEvent){
System.exit(0);
}
});
controlPanel = new JPanel();
controlPanel.setLayout(new FlowLayout());
mainFrame.add(headerLabel);
mainFrame.add(controlPanel);
mainFrame.add(statusLabel);
mainFrame.setVisible(true);
}
private void showPopupMenuDemo(){
final JPopupMenu editMenu = new JPopupMenu("编辑");
JMenuItem cutMenuItem = new JMenuItem("剪切");
cutMenuItem.setActionCommand("Cut");
JMenuItem copyMenuItem = new JMenuItem("复制");
copyMenuItem.setActionCommand("Copy");
JMenuItem pasteMenuItem = new JMenuItem("粘贴");
pasteMenuItem.setActionCommand("Paste");
MenuItemListener menuItemListener = new MenuItemListener();
cutMenuItem.addActionListener(menuItemListener);
copyMenuItem.addActionListener(menuItemListener);
pasteMenuItem.addActionListener(menuItemListener);
editMenu.add(cutMenuItem);
editMenu.add(copyMenuItem);
editMenu.add(pasteMenuItem);
mainFrame.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
editMenu.show(mainFrame, e.getX(), e.getY());
}
});
mainFrame.add(editMenu);
mainFrame.setVisible(true);
}
class MenuItemListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
statusLabel.setText(e.getActionCommand() + " MenuItem clicked.");
}
}
}
执行上面示例代码,得到以下结果: