FileDocCategorySizeDatePackage
ActionDemo.javaAPI DocExample5806Tue Dec 12 18:59:10 GMT 2000None

ActionDemo

public class ActionDemo extends JFrame

(Omit source code)

Fields Summary
protected JTextArea
textArea
protected String
newline
protected Action
leftAction
protected Action
middleAction
protected Action
rightAction
Constructors Summary
public ActionDemo()


      
        //Do frame stuff.
        super("ActionDemo");
        addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });

        //Create the toolbar and menu.
        JToolBar toolBar = new JToolBar();
        JMenu mainMenu = new JMenu("Menu");
        createActionComponents(toolBar, mainMenu);

        //Create the text area used for output.
        textArea = new JTextArea(5, 30);
        JScrollPane scrollPane = new JScrollPane(textArea);

        //Lay out the content pane.
        JPanel contentPane = new JPanel();
        contentPane.setLayout(new BorderLayout());
        contentPane.setPreferredSize(new Dimension(400, 150));
        contentPane.add(toolBar, BorderLayout.SOUTH);
        contentPane.add(scrollPane, BorderLayout.CENTER);
        setContentPane(contentPane);

        //Set up the menu bar.
        JMenuBar mb = new JMenuBar();
        mb.add(mainMenu);
        mb.add(createAbleMenu());
        setJMenuBar(mb);
Methods Summary
protected javax.swing.JMenucreateAbleMenu()

        JMenu ableMenu = new JMenu("Action State");
        JCheckBoxMenuItem cbmi = null;

        cbmi = new JCheckBoxMenuItem("First action enabled");
        cbmi.setSelected(true);
        cbmi.addItemListener(new ItemListener() {
            public void itemStateChanged(ItemEvent e) {
                JCheckBoxMenuItem mi = (JCheckBoxMenuItem)(e.getSource());
                boolean selected =
                    (e.getStateChange() == ItemEvent.SELECTED);
                leftAction.setEnabled(selected);
            }
        });
        ableMenu.add(cbmi);

        cbmi = new JCheckBoxMenuItem("Second action enabled");
        cbmi.setSelected(true);
        cbmi.addItemListener(new ItemListener() {
            public void itemStateChanged(ItemEvent e) {
                JCheckBoxMenuItem mi = (JCheckBoxMenuItem)(e.getSource());
                boolean selected = 
                    (e.getStateChange() == ItemEvent.SELECTED);
                middleAction.setEnabled(selected);
            }
        });
        ableMenu.add(cbmi);

        cbmi = new JCheckBoxMenuItem("Third action enabled");
        cbmi.setSelected(true);
        cbmi.addItemListener(new ItemListener() {
            public void itemStateChanged(ItemEvent e) {
                JCheckBoxMenuItem mi =
                    (JCheckBoxMenuItem)(e.getSource());
                boolean selected =
                    (e.getStateChange() == ItemEvent.SELECTED);
                rightAction.setEnabled(selected);
            }
        });
        ableMenu.add(cbmi);

        return ableMenu;
protected voidcreateActionComponents(javax.swing.JToolBar toolBar, javax.swing.JMenu mainMenu)

        JButton button = null;
        JMenuItem menuItem = null;

        //first button and menu item
        leftAction = new AbstractAction("Go left", 
                             new ImageIcon("images/left.gif")) {
            public void actionPerformed(ActionEvent e) {
                displayResult("Action for first button/menu item", e);
            }
        };
        button = toolBar.add(leftAction);
        button.setText(""); //an icon-only button
        button.setToolTipText("This is the left button");
        menuItem = mainMenu.add(leftAction);
        menuItem.setIcon(null); //arbitrarily chose not to use icon in menu

        //second button and menu item
        middleAction = new AbstractAction("Do something", 
                             new ImageIcon("images/middle.gif")) {
            public void actionPerformed(ActionEvent e) {
                displayResult("Action for second button/menu item", e);
            }
        };
        button = toolBar.add(middleAction);
        button.setText("");
        button.setToolTipText("This is the middle button");
        menuItem = mainMenu.add(middleAction);
        menuItem.setIcon(null); //arbitrarily chose not to use icon in menu

        //third button and menu item
        rightAction = new AbstractAction("Go right", 
                             new ImageIcon("images/right.gif")) {
            public void actionPerformed(ActionEvent e) {
                displayResult("Action for third button/menu item", e);
            }
        };
        button = toolBar.add(rightAction);
        button.setText("");
        button.setToolTipText("This is the right button");
        menuItem = mainMenu.add(rightAction);
        menuItem.setIcon(null); //arbitrarily chose not to use icon in menu
protected voiddisplayResult(java.lang.String actionDescription, java.awt.event.ActionEvent e)

        String s = ("Action event detected by: "
                  + actionDescription 
                  + newline 
                  + "    Event source: " + e.getSource()
                  + newline);
        textArea.append(s);
public static voidmain(java.lang.String[] args)

        ActionDemo frame = new ActionDemo();
        frame.pack();
        frame.setVisible(true);