| /* MenuBar.java -- An AWT menu bar class |
| Copyright (C) 1999, 2000, 2001, 2002, 2004, 2005, 2006 |
| Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU Classpath is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| |
| package java.awt; |
| |
| import java.awt.peer.MenuBarPeer; |
| |
| import java.io.Serializable; |
| import java.util.Enumeration; |
| import java.util.Vector; |
| |
| import javax.accessibility.Accessible; |
| import javax.accessibility.AccessibleContext; |
| import javax.accessibility.AccessibleRole; |
| |
| /** |
| * This class implements a menu bar in the AWT system. |
| * |
| * @author Aaron M. Renn (arenn@urbanophile.com) |
| * @author Tom Tromey (tromey@redhat.com) |
| * @author Andrew John Hughes (gnu_andrew@member.fsf.org) |
| */ |
| public class MenuBar extends MenuComponent |
| implements MenuContainer, Serializable, Accessible |
| { |
| |
| // Serialization Constant |
| private static final long serialVersionUID = -4930327919388951260L; |
| |
| /** |
| * The number used to generate the name returned by getName. |
| */ |
| private static transient long next_menubar_number; |
| |
| /** |
| * @serial The menu used for providing help information |
| */ |
| private Menu helpMenu; |
| |
| /** |
| * @serial The menus contained in this menu bar. |
| */ |
| private Vector menus = new Vector(); |
| |
| /** |
| * Initializes a new instance of <code>MenuBar</code>. |
| * |
| * @throws HeadlessException if GraphicsEnvironment.isHeadless() is true |
| */ |
| public MenuBar() |
| { |
| if (GraphicsEnvironment.isHeadless()) |
| throw new HeadlessException(); |
| } |
| |
| /** |
| * Returns the help menu for this menu bar. This may be <code>null</code>. |
| * |
| * @return the help menu for this menu bar |
| */ |
| public Menu getHelpMenu() |
| { |
| return helpMenu; |
| } |
| |
| /** |
| * Sets the help menu for this menu bar. |
| * |
| * @param menu the new help menu for this menu bar |
| */ |
| public synchronized void setHelpMenu(Menu menu) |
| { |
| MenuBarPeer myPeer = (MenuBarPeer) getPeer (); |
| |
| if (helpMenu != null) |
| { |
| if (myPeer != null) |
| helpMenu.removeNotify(); |
| helpMenu.setParent(null); |
| } |
| helpMenu = menu; |
| |
| MenuContainer parent = menu.getParent(); |
| if (parent != null) |
| parent.remove(menu); |
| menu.setParent(this); |
| |
| if (myPeer != null) |
| { |
| menu.addNotify(); |
| myPeer.addHelpMenu(menu); |
| } |
| } |
| |
| /** |
| * Add a menu to this MenuBar. If the menu has already has a |
| * parent, it is first removed from its old parent before being |
| * added. |
| * |
| * @param menu the menu to add |
| * |
| * @return the menu that was added |
| */ |
| public synchronized Menu add(Menu menu) |
| { |
| MenuBarPeer myPeer = (MenuBarPeer) getPeer (); |
| |
| MenuContainer parent = menu.getParent(); |
| if (parent != null) |
| parent.remove(menu); |
| |
| menus.addElement(menu); |
| menu.setParent(this); |
| |
| if (myPeer != null) |
| { |
| menu.addNotify(); |
| myPeer.addMenu(menu); |
| } |
| return menu; |
| } |
| |
| /** |
| * Removes the menu at the specified index. |
| * |
| * @param index the index of the menu to remove from the menu bar |
| */ |
| public synchronized void remove(int index) |
| { |
| Menu m = (Menu) menus.remove(index); |
| MenuBarPeer mp = (MenuBarPeer) getPeer(); |
| |
| if (mp != null) |
| m.removeNotify(); |
| |
| m.setParent(null); |
| |
| if (mp != null) |
| mp.delMenu(index); |
| } |
| |
| /** |
| * Removes the specified menu from the menu bar. |
| * |
| * @param menu the menu to remove from the menu bar |
| */ |
| public void remove(MenuComponent menu) |
| { |
| int index = menus.indexOf(menu); |
| if (index == -1) |
| return; |
| |
| remove(index); |
| } |
| |
| /** |
| * Returns the number of elements in this menu bar. |
| * |
| * @return the number of elements in the menu bar |
| */ |
| public int getMenuCount() |
| { |
| return countMenus(); |
| } |
| |
| /** |
| * Returns the number of elements in this menu bar. |
| * |
| * @return the number of elements in the menu bar |
| * |
| * @deprecated This method is deprecated in favor of |
| * <code>getMenuCount()</code>. |
| */ |
| public int countMenus() |
| { |
| return menus.size() + (getHelpMenu() == null ? 0 : 1); |
| } |
| |
| /** |
| * Returns the menu at the specified index. |
| * |
| * @param index the index of the menu |
| * |
| * @return the requested menu |
| * |
| * @throws ArrayIndexOutOfBoundsException if the index is not valid |
| */ |
| public Menu getMenu(int index) |
| { |
| return (Menu) menus.elementAt(index); |
| } |
| |
| /** |
| * Creates this object's native peer. |
| */ |
| public void addNotify() |
| { |
| MenuBarPeer peer = (MenuBarPeer) getPeer(); |
| if (peer == null) |
| { |
| peer = getToolkit().createMenuBar(this); |
| setPeer(peer); |
| } |
| |
| Enumeration e = menus.elements(); |
| while (e.hasMoreElements()) |
| { |
| Menu mi = (Menu)e.nextElement(); |
| mi.addNotify(); |
| peer.addMenu(mi); |
| } |
| |
| if (helpMenu != null) |
| { |
| helpMenu.addNotify(); |
| peer.addHelpMenu(helpMenu); |
| } |
| } |
| |
| /** |
| * Destroys this object's native peer. |
| */ |
| public void removeNotify() |
| { |
| Enumeration e = menus.elements(); |
| while (e.hasMoreElements()) |
| { |
| Menu mi = (Menu) e.nextElement(); |
| mi.removeNotify(); |
| } |
| super.removeNotify(); |
| } |
| |
| /** |
| * Returns a list of all shortcuts for the menus in this menu bar. |
| * |
| * @return a list of all shortcuts for the menus in this menu bar |
| */ |
| public synchronized Enumeration shortcuts() |
| { |
| Vector shortcuts = new Vector(); |
| Enumeration e = menus.elements(); |
| |
| while (e.hasMoreElements()) |
| { |
| Menu menu = (Menu)e.nextElement(); |
| if (menu.getShortcut() != null) |
| shortcuts.addElement(menu.getShortcut()); |
| } |
| |
| return shortcuts.elements(); |
| } |
| |
| /** |
| * Returns the menu item for the specified shortcut, or <code>null</code> |
| * if no such item exists. |
| * |
| * @param shortcut the shortcut to return the menu item for |
| * |
| * @return the menu item for the specified shortcut |
| */ |
| public MenuItem getShortcutMenuItem(MenuShortcut shortcut) |
| { |
| Enumeration e = menus.elements(); |
| |
| while (e.hasMoreElements()) |
| { |
| Menu menu = (Menu) e.nextElement(); |
| MenuShortcut s = menu.getShortcut(); |
| if ((s != null) && s.equals(shortcut)) |
| return menu; |
| } |
| |
| return null; |
| } |
| |
| /** |
| * Deletes the specified menu shortcut. |
| * |
| * @param shortcut the shortcut to delete |
| */ |
| public void deleteShortcut(MenuShortcut shortcut) |
| { |
| MenuItem it; |
| // This is a slow implementation, but it probably doesn't matter. |
| while ((it = getShortcutMenuItem (shortcut)) != null) |
| it.deleteShortcut(); |
| } |
| |
| /** |
| * Gets the AccessibleContext associated with this <code>MenuBar</code>. |
| * The context is created, if necessary. |
| * |
| * @return the associated context |
| */ |
| public AccessibleContext getAccessibleContext() |
| { |
| // Create the context if this is the first request. |
| if (accessibleContext == null) |
| accessibleContext = new AccessibleAWTMenuBar(); |
| return accessibleContext; |
| } |
| |
| /** |
| * Generate a unique name for this <code>MenuBar</code>. |
| * |
| * @return A unique name for this <code>MenuBar</code>. |
| */ |
| String generateName() |
| { |
| return "menubar" + getUniqueLong(); |
| } |
| |
| private static synchronized long getUniqueLong() |
| { |
| return next_menubar_number++; |
| } |
| |
| /** |
| * This class provides accessibility support for AWT menu bars. |
| * |
| * @author Andrew John Hughes (gnu_andrew@member.fsf.org) |
| */ |
| protected class AccessibleAWTMenuBar |
| extends AccessibleAWTMenuComponent |
| { |
| |
| /** |
| * Compatible with JDK 1.4.2 revision 5 |
| */ |
| private static final long serialVersionUID = -8577604491830083815L; |
| |
| /** |
| * This is the default constructor, which simply calls the default |
| * constructor of the superclass. |
| */ |
| protected AccessibleAWTMenuBar() |
| { |
| super(); |
| } |
| |
| /** |
| * Returns the accessible role relating to the menu bar. |
| * |
| * @return <code>AccessibleRole.MENU_BAR</code> |
| */ |
| public AccessibleRole getAccessibleRole() |
| { |
| return AccessibleRole.MENU_BAR; |
| } |
| |
| } |
| |
| } |