Popup.java Source code

Introduction

Here is the source code for Popup.java

Source

// : c14:Popup.java
// Creating popup menus with Swing.
// <applet code=Popup width=300 height=200></applet>
// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
// www.BruceEckel.com. See copyright notice in CopyRight.txt.

import java.awt.Container;
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.JApplet;
import javax.swing.JFrame;
import javax.swing.JMenuItem;
import javax.swing.JPopupMenu;
import javax.swing.JTextField;

public class Popup extends JApplet {
    private JPopupMenu popup = new JPopupMenu();

    private JTextField t = new JTextField(10);

    public void init() {
        Container cp = getContentPane();
        cp.setLayout(new FlowLayout());
        cp.add(t);
        ActionListener al = new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                t.setText(((JMenuItem) e.getSource()).getText());
            }
        };
        JMenuItem m = new JMenuItem("Hither");
        m.addActionListener(al);
        popup.add(m);
        m = new JMenuItem("Yon");
        m.addActionListener(al);
        popup.add(m);
        m = new JMenuItem("Afar");
        m.addActionListener(al);
        popup.add(m);
        popup.addSeparator();
        m = new JMenuItem("Stay Here");
        m.addActionListener(al);
        popup.add(m);
        PopupListener pl = new PopupListener();
        addMouseListener(pl);
        t.addMouseListener(pl);
    }

    class PopupListener extends MouseAdapter {
        public void mousePressed(MouseEvent e) {
            maybeShowPopup(e);
        }

        public void mouseReleased(MouseEvent e) {
            maybeShowPopup(e);
        }

        private void maybeShowPopup(MouseEvent e) {
            if (e.isPopupTrigger())
                popup.show(((JApplet) e.getComponent()).getContentPane(), e.getX(), e.getY());
        }
    }

    public static void main(String[] args) {
        run(new Popup(), 300, 200);
    }

    public static void run(JApplet applet, int width, int height) {
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().add(applet);
        frame.setSize(width, height);
        applet.init();
        applet.start();
        frame.setVisible(true);
    }
} ///:~