MenuLayoutDemo.java Source code

Introduction

Here is the source code for MenuLayoutDemo.java

Source

/* From http://java.sun.com/docs/books/tutorial/index.html */

/*
 * Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * -Redistribution of source code must retain the above copyright notice, this
 *  list of conditions and the following disclaimer.
 *
 * -Redistribution in binary form must reproduce the above copyright notice,
 *  this list of conditions and the following disclaimer in the documentation
 *  and/or other materials provided with the distribution.
 *
 * Neither the name of Sun Microsystems, Inc. or the names of contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * This software is provided "AS IS," without a warranty of any kind. ALL
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING
 * ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
 * OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN")
 * AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE
 * AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
 * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST
 * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL,
 * INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY
 * OF LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE,
 * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 *
 * You acknowledge that this software is not designed, licensed or intended
 * for use in the design, construction, operation or maintenance of any
 * nuclear facility.
 */

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;

import javax.swing.BorderFactory;
import javax.swing.BoxLayout;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JPopupMenu;

/**
 * @author ges
 * @author kwalrath
 */
/* MenuLayoutDemo.java is a 1.4 application that requires no other files. */

public class MenuLayoutDemo {
    public JMenuBar createMenuBar() {
        JMenuBar menuBar = new JMenuBar();
        menuBar.setLayout(new BoxLayout(menuBar, BoxLayout.PAGE_AXIS));
        menuBar.add(createMenu("Menu 1"));
        menuBar.add(createMenu("Menu 2"));
        menuBar.add(createMenu("Menu 3"));

        menuBar.setBorder(BorderFactory.createMatteBorder(0, 0, 0, 1, Color.BLACK));
        return menuBar;
    }

    // used by createMenuBar
    public JMenu createMenu(String title) {
        JMenu m = new HorizontalMenu(title);
        m.add("Menu item #1 in " + title);
        m.add("Menu item #2 in " + title);
        m.add("Menu item #3 in " + title);

        JMenu submenu = new HorizontalMenu("Submenu");
        submenu.add("Submenu item #1");
        submenu.add("Submenu item #2");
        m.add(submenu);

        return m;
    }

    /**
     * Create the GUI and show it.  For thread safety,
     * this method should be invoked from the
     * event-dispatching thread.
     */
    private static void createAndShowGUI() {
        //Make sure we have nice window decorations.
        JFrame.setDefaultLookAndFeelDecorated(true);

        //Create and set up the window.
        JFrame frame = new JFrame("MenuLayoutDemo");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        //Create and set up the content pane.
        MenuLayoutDemo demo = new MenuLayoutDemo();
        Container contentPane = frame.getContentPane();
        contentPane.setBackground(Color.WHITE); //contrasting bg
        contentPane.add(demo.createMenuBar(), BorderLayout.LINE_START);

        //Display the window.
        frame.setSize(300, 150);
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        //Schedule a job for the event-dispatching thread:
        //creating and showing this application's GUI.
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
    }

    class HorizontalMenu extends JMenu {
        HorizontalMenu(String label) {
            super(label);
            JPopupMenu pm = getPopupMenu();
            pm.setLayout(new BoxLayout(pm, BoxLayout.LINE_AXIS));
        }

        public Dimension getMinimumSize() {
            return getPreferredSize();
        }

        public Dimension getMaximumSize() {
            return getPreferredSize();
        }

        public void setPopupMenuVisible(boolean b) {
            boolean isVisible = isPopupMenuVisible();
            if (b != isVisible) {
                if ((b == true) && isShowing()) {
                    //Set location of popupMenu (pulldown or pullright).
                    //Perhaps this should be dictated by L&F.
                    int x = 0;
                    int y = 0;
                    Container parent = getParent();
                    if (parent instanceof JPopupMenu) {
                        x = 0;
                        y = getHeight();
                    } else {
                        x = getWidth();
                        y = 0;
                    }
                    getPopupMenu().show(this, x, y);
                } else {
                    getPopupMenu().setVisible(false);
                }
            }
        }
    }
}