import java.awt.*; import java.awt.event.*; import javax.swing.*; /** * @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); } } } } }