samer@1: import java.awt.*;
samer@1: import java.awt.event.*;
samer@1: import javax.swing.JPopupMenu;
samer@1: import javax.swing.JMenu;
samer@1: import javax.swing.JMenuItem;
samer@1: import javax.swing.JCheckBoxMenuItem;
samer@1: import javax.swing.JRadioButtonMenuItem;
samer@1: import javax.swing.ButtonGroup;
samer@1: import javax.swing.JMenuBar;
samer@1: import javax.swing.KeyStroke;
samer@1: import javax.swing.ImageIcon;
samer@1: 
samer@1: import javax.swing.JTextArea;
samer@1: import javax.swing.JScrollPane;
samer@1: import javax.swing.JFrame;
samer@1: 
samer@1: /*
samer@1:  * This class adds popup menus to MenuDemo.
samer@1:  */
samer@1: public class PopupMenuDemo extends JFrame 
samer@1:                            implements ActionListener, ItemListener {
samer@1:     JTextArea output;
samer@1:     JScrollPane scrollPane;
samer@1:     String newline = "\n";
samer@1:     JPopupMenu popup;
samer@1: 
samer@1:     public PopupMenuDemo() {
samer@1:         JMenuBar menuBar;
samer@1:         JMenu menu, submenu;
samer@1:         JMenuItem menuItem;
samer@1:         JRadioButtonMenuItem rbMenuItem;
samer@1:         JCheckBoxMenuItem cbMenuItem;
samer@1: 
samer@1:         addWindowListener(new WindowAdapter() {
samer@1:             public void windowClosing(WindowEvent e) {
samer@1:                 System.exit(0);
samer@1:             }
samer@1:         });
samer@1: 
samer@1:         //Add regular components to the window, using the default BorderLayout.
samer@1:         Container contentPane = getContentPane();
samer@1:         output = new JTextArea(5, 30);
samer@1:         output.setEditable(false);
samer@1:         scrollPane = new JScrollPane(output);
samer@1:         contentPane.add(scrollPane, BorderLayout.CENTER);
samer@1: 
samer@1:         //Create the menu bar.
samer@1:         menuBar = new JMenuBar();
samer@1:         setJMenuBar(menuBar);
samer@1: 
samer@1:         //Build the first menu.
samer@1:         menu = new JMenu("A Menu");
samer@1:         menu.setMnemonic(KeyEvent.VK_A);
samer@1:         menu.getAccessibleContext().setAccessibleDescription(
samer@1:                 "The only menu in this program that has menu items");
samer@1:         menuBar.add(menu);
samer@1: 
samer@1:         //a group of JMenuItems
samer@1:         menuItem = new JMenuItem("A text-only menu item",
samer@1:                                  KeyEvent.VK_T);
samer@1:         //menuItem.setMnemonic(KeyEvent.VK_T); //used constructor instead
samer@1:         menuItem.setAccelerator(KeyStroke.getKeyStroke(
samer@1:                 KeyEvent.VK_1, ActionEvent.ALT_MASK));
samer@1:         menuItem.getAccessibleContext().setAccessibleDescription(
samer@1:                 "This doesn't really do anything");
samer@1:         menuItem.addActionListener(this);
samer@1:         menu.add(menuItem);
samer@1:         menuItem = new JMenuItem("Both text and icon", 
samer@1:                                  new ImageIcon("images/middle.gif"));
samer@1:         menuItem.setMnemonic(KeyEvent.VK_B);
samer@1:         menuItem.addActionListener(this);
samer@1:         menu.add(menuItem);
samer@1:         menuItem = new JMenuItem(new ImageIcon("images/middle.gif"));
samer@1:         menuItem.setMnemonic(KeyEvent.VK_D);
samer@1:         menuItem.addActionListener(this);
samer@1:         menu.add(menuItem);
samer@1: 
samer@1:         //a group of radio button menu items
samer@1:         menu.addSeparator();
samer@1:         ButtonGroup group = new ButtonGroup();
samer@1:         rbMenuItem = new JRadioButtonMenuItem("A radio button menu item");
samer@1:         rbMenuItem.setSelected(true);
samer@1:         rbMenuItem.setMnemonic(KeyEvent.VK_R);
samer@1:         group.add(rbMenuItem);
samer@1:         rbMenuItem.addActionListener(this);
samer@1:         menu.add(rbMenuItem);
samer@1:         rbMenuItem = new JRadioButtonMenuItem("Another one");
samer@1:         rbMenuItem.setMnemonic(KeyEvent.VK_O);
samer@1:         group.add(rbMenuItem);
samer@1:         rbMenuItem.addActionListener(this);
samer@1:         menu.add(rbMenuItem);
samer@1: 
samer@1:         //a group of check box menu items
samer@1:         menu.addSeparator();
samer@1:         cbMenuItem = new JCheckBoxMenuItem("A check box menu item");
samer@1:         cbMenuItem.setMnemonic(KeyEvent.VK_C);
samer@1:         cbMenuItem.addItemListener(this);
samer@1:         menu.add(cbMenuItem);
samer@1:         cbMenuItem = new JCheckBoxMenuItem("Another one");
samer@1:         cbMenuItem.setMnemonic(KeyEvent.VK_H);
samer@1:         cbMenuItem.addItemListener(this);
samer@1:         menu.add(cbMenuItem);
samer@1: 
samer@1:         //a submenu
samer@1:         menu.addSeparator();
samer@1:         submenu = new JMenu("A submenu");
samer@1:         submenu.setMnemonic(KeyEvent.VK_S);
samer@1: 
samer@1:         menuItem = new JMenuItem("An item in the submenu");
samer@1:         menuItem.setAccelerator(KeyStroke.getKeyStroke(
samer@1:                 KeyEvent.VK_2, ActionEvent.ALT_MASK));
samer@1:         menuItem.addActionListener(this);
samer@1:         submenu.add(menuItem);
samer@1: 
samer@1:         menuItem = new JMenuItem("Another item");
samer@1:         menuItem.addActionListener(this);
samer@1:         submenu.add(menuItem);
samer@1:         menu.add(submenu);
samer@1: 
samer@1:         //Build second menu in the menu bar.
samer@1:         menu = new JMenu("Another Menu");
samer@1:         menu.setMnemonic(KeyEvent.VK_N);
samer@1:         menu.getAccessibleContext().setAccessibleDescription(
samer@1:                 "This menu does nothing");
samer@1:         menuBar.add(menu);
samer@1: 
samer@1:         //Create the popup menu.
samer@1:         popup = new JPopupMenu();
samer@1:         menuItem = new JMenuItem("A popup menu item");
samer@1:         menuItem.addActionListener(this);
samer@1:         popup.add(menuItem);
samer@1:         menuItem = new JMenuItem("Another popup menu item");
samer@1:         menuItem.addActionListener(this);
samer@1:         popup.add(menuItem);
samer@1: 
samer@1:         //Add listener to components that can bring up popup menus.
samer@1:         MouseListener popupListener = new PopupListener();
samer@1:         output.addMouseListener(popupListener);
samer@1:         scrollPane.addMouseListener(popupListener);
samer@1:         menuBar.addMouseListener(popupListener);
samer@1:     }
samer@1: 
samer@1:     public void actionPerformed(ActionEvent e) {
samer@1:         JMenuItem source = (JMenuItem)(e.getSource());
samer@1:         String s = "Action event detected."
samer@1:                    + newline
samer@1:                    + "    Event source: " + source.getText()
samer@1:                    + " (an instance of " + getClassName(source) + ")";
samer@1:         output.append(s + newline);
samer@1:     }
samer@1: 
samer@1:     public void itemStateChanged(ItemEvent e) {
samer@1:         JMenuItem source = (JMenuItem)(e.getSource());
samer@1:         String s = "Item event detected."
samer@1:                    + newline
samer@1:                    + "    Event source: " + source.getText()
samer@1:                    + " (an instance of " + getClassName(source) + ")"
samer@1:                    + newline
samer@1:                    + "    New state: " 
samer@1:                    + ((e.getStateChange() == ItemEvent.SELECTED) ?
samer@1:                      "selected":"unselected");
samer@1:         output.append(s + newline);
samer@1:     }
samer@1: 
samer@1:     // Returns just the class name -- no package info.
samer@1:     protected String getClassName(Object o) {
samer@1:         String classString = o.getClass().getName();
samer@1:         int dotIndex = classString.lastIndexOf(".");
samer@1:         return classString.substring(dotIndex+1);
samer@1:     }
samer@1: 
samer@1:     public static void main(String[] args) {
samer@1:         PopupMenuDemo window = new PopupMenuDemo();
samer@1: 
samer@1:         window.setTitle("PopupMenuDemo");
samer@1:         window.setSize(450, 260);
samer@1:         window.setVisible(true);
samer@1:     }
samer@1: 
samer@1:     class PopupListener extends MouseAdapter {
samer@1:         public void mousePressed(MouseEvent e) {
samer@1:             maybeShowPopup(e);
samer@1:         }
samer@1: 
samer@1:         public void mouseReleased(MouseEvent e) {
samer@1:             maybeShowPopup(e);
samer@1:         }
samer@1: 
samer@1:         private void maybeShowPopup(MouseEvent e) {
samer@1:             if (e.isPopupTrigger()) {
samer@1:                 popup.show(e.getComponent(),
samer@1:                            e.getX(), e.getY());
samer@1:             }
samer@1:         }
samer@1:     }
samer@1: }