Popup Menu Demo : Menu « Swing JFC « Java

Popup Menu Demo

Popup Menu Demo
//From: mg@dsd.camb.inmet.com (Mitch Gart)

import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Component;
import java.awt.Frame;
import java.awt.Label;
import java.awt.Menu;
import java.awt.MenuBar;
import java.awt.MenuItem;
import java.awt.Panel;
import java.awt.PopupMenu;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.util.Hashtable;

public class PopupDemo extends Frame implements ActionListener, MouseListener {

  public static void main(String argv[]) {
    new PopupDemo().setVisible(true);

  public PopupDemo() {
    MenuBar mb = new MenuBar();
    Menu m = new Menu("file");
    MenuItem item = new MenuItem("file-1");
    item = new MenuItem("file-2");

    setSize(100, 100);
    setLayout(new BorderLayout());

    Label l = new Label("label");
    addPopup(l, "label");
    add(l, "North");

    Panel p = new Panel();
    addPopup(p, "Panel");
    add(p, "Center");

    Button b = new Button("button");
    addPopup(b, "button");
    add(b, "South");

  public void actionPerformed(ActionEvent e) {
    System.out.println("actionPerformed, event=" + e + ", mod="
        + getMods(e));
    System.out.println(" command=" + e.getActionCommand());
    System.out.println(" param=" + e.paramString());
    System.out.println(" source=" + e.getSource());

  String getMods(ActionEvent e) {
    return getMods(e.getModifiers());

  String getMods(MouseEvent e) {
    return getMods(e.getModifiers());

  // a convenience routine for printing the Modifier keys
  String getMods(int mods) {
    String modstr = "";
    if ((mods & ActionEvent.SHIFT_MASK) == ActionEvent.SHIFT_MASK)
      modstr += (" SHIFT");
    if ((mods & ActionEvent.ALT_MASK) == ActionEvent.ALT_MASK)
      modstr += (" ALT");
    if ((mods & ActionEvent.CTRL_MASK) == ActionEvent.CTRL_MASK)
      modstr += (" CTRL");
    if ((mods & ActionEvent.META_MASK) == ActionEvent.META_MASK)
      modstr += (" META");
    return modstr;

  public void mouseClicked(MouseEvent e) {
    mouseAction("mouseClicked", e);

  public void mouseEntered(MouseEvent e) {

  public void mouseExited(MouseEvent e) {

  public void mousePressed(MouseEvent e) {
    mouseAction("mousePressed", e);

  public void mouseReleased(MouseEvent e) {
    mouseAction("mouseReleased", e);

  void mouseAction(String which, MouseEvent e) {
    Component c = e.getComponent();
    System.out.println(which + "e=" + e + ", mods=" + getMods(e)
        + ", component=" + c);
    if (e.isPopupTrigger()) {
      PopupMenu pm = getHash(c);
      pm.show(c, c.getSize().width / 2, c.getSize().height / 2);

  void addPopup(Component c, String name) {
    PopupMenu pm = new PopupMenu();
    MenuItem mi = new MenuItem(name + "-1");

    mi = new MenuItem(name + "-2");

    setHash(c, pm);

  Hashtable popupTable = new Hashtable();

  void setHash(Component c, PopupMenu p) {
    popupTable.put(c, p);

  PopupMenu getHash(Component c) {
    return (PopupMenu) (popupTable.get(c));


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