Creating popup menus with Swing
// : 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);
}
} ///:~
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