459 lines
11 KiB
Java
459 lines
11 KiB
Java
/* MenuItem.java -- An item in a menu
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Copyright (C) 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.awt;
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import java.awt.peer.MenuItemPeer;
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import java.awt.peer.MenuComponentPeer;
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import java.awt.event.ActionEvent;
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import java.awt.event.ActionListener;
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import java.util.EventListener;
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/**
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* This class represents an item in a menu.
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*
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* @author Aaron M. Renn (arenn@urbanophile.com)
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*/
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public class MenuItem extends MenuComponent implements java.io.Serializable
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{
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// FIXME: The enabled event mask is not used at this time.
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/*
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* Static Variables
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*/
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// Serialization Constant
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private static final long serialVersionUID = -21757335363267194L;
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/*************************************************************************/
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/*
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* Instance Variables
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*/
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/**
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* @serial The name of the action command generated by this item.
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*/
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private String actionCommand;
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/**
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* @serial Indicates whether or not this menu item is enabled.
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*/
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private boolean enabled;
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/**
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* @serial The mask of events that are enabled for this menu item.
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*/
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private long eventMask;
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/**
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* @serial This menu item's label
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*/
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private String label;
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/**
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* @serial The shortcut for this menu item, if any
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*/
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private MenuShortcut shortcut;
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// The list of action listeners for this menu item.
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private transient ActionListener action_listeners;
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/*************************************************************************/
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/*
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* Constructors
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*/
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/**
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* Initializes a new instance of <code>MenuItem</code> with no label
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* and no shortcut.
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*/
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public
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MenuItem()
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{
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}
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/*************************************************************************/
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/**
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* Initializes a new instance of <code>MenuItem</code> with the specified
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* label and no shortcut.
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*
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* @param label The label for this menu item.
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*/
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public
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MenuItem(String label)
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{
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this.label = label;
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}
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/*************************************************************************/
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/**
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* Initializes a new instance of <code>MenuItem</code> with the specified
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* label and shortcut.
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*
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* @param label The label for this menu item.
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* @param shortcut The shortcut for this menu item.
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*/
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public
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MenuItem(String label, MenuShortcut shortcut)
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{
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this.label = label;
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this.shortcut = shortcut;
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}
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/*************************************************************************/
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/*
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* Instance Methods
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*/
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/**
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* Returns the label for this menu item, which may be <code>null</code>.
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*
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* @return The label for this menu item.
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*/
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public String
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getLabel()
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{
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return(label);
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}
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/*************************************************************************/
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/**
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* This method sets the label for this menu to the specified value.
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*
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* @param label The new label for this menu item.
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*/
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public synchronized void
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setLabel(String label)
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{
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this.label = label;
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if (peer != null)
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{
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MenuItemPeer mp = (MenuItemPeer) peer;
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mp.setLabel (label);
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}
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}
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/*************************************************************************/
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/**
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* Tests whether or not this menu item is enabled.
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*
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* @return <code>true</code> if this menu item is enabled, <code>false</code>
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* otherwise.
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*/
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public boolean
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isEnabled()
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{
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return(enabled);
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}
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/*************************************************************************/
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/**
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* Sets the enabled status of this menu item.
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*
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* @param enabled <code>true</code> to enable this menu item,
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* <code>false</code> otherwise.
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*/
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public synchronized void
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setEnabled(boolean enabled)
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{
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if (enabled == this.enabled)
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return;
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this.enabled = enabled;
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if (peer != null)
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{
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MenuItemPeer mp = (MenuItemPeer) peer;
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mp.setEnabled (enabled);
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}
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}
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/*************************************************************************/
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/**
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* Sets the enabled status of this menu item.
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*
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* @param enabled <code>true</code> to enable this menu item,
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* <code>false</code> otherwise.
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*
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* @deprecated This method is deprecated in favor of <code>setEnabled()</code>.
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*/
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public void
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enable(boolean enabled)
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{
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setEnabled(enabled);
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}
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/*************************************************************************/
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/**
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* Enables this menu item.
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*
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* @deprecated This method is deprecated in favor of <code>setEnabled()</code>.
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*/
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public void
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enable()
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{
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setEnabled(true);
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}
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/*************************************************************************/
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/**
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* Disables this menu item.
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*
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* @deprecated This method is deprecated in favor of <code>setEnabled()</code>.
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*/
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public void
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disable()
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{
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setEnabled(false);
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}
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/*************************************************************************/
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/**
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* Returns the shortcut for this menu item, which may be <code>null</code>.
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*
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* @return The shortcut for this menu item.
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*/
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public MenuShortcut
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getShortcut()
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{
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return(shortcut);
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}
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/*************************************************************************/
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/**
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* Sets the shortcut for this menu item to the specified value. This
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* must be done before the native peer is created.
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*
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* @param shortcut The new shortcut for this menu item.
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*/
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public void
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setShortcut(MenuShortcut shortcut)
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{
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this.shortcut = shortcut;
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}
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/*************************************************************************/
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/**
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* Deletes the shortcut for this menu item if one exists. This must be
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* done before the native peer is created.
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*/
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public void
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deleteShortcut()
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{
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shortcut = null;
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}
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/*************************************************************************/
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/**
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* Returns the name of the action command in the action events
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* generated by this menu item.
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*
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* @return The action command name
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*/
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public String
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getActionCommand()
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{
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return(actionCommand);
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}
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/*************************************************************************/
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/**
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* Sets the name of the action command in the action events generated by
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* this menu item.
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*
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* @param actionCommand The new action command name.
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*/
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public void
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setActionCommand(String actionCommand)
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{
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this.actionCommand = actionCommand;
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}
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/*************************************************************************/
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/**
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* Enables the specified events. This is done automatically when a
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* listener is added and does not normally need to be done by
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* application code.
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*
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* @param events The events to enable, which should be the bit masks
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* from <code>AWTEvent</code>.
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*/
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protected final void
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enableEvents(long events)
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{
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eventMask |= events;
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// TODO: see comment in Component.enableEvents().
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}
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/*************************************************************************/
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/**
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* Disables the specified events.
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*
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* @param events The events to enable, which should be the bit masks
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* from <code>AWTEvent</code>.
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*/
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protected final void
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disableEvents(long events)
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{
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eventMask &= ~events;
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}
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/*************************************************************************/
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/**
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* Creates the native peer for this object.
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*/
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public void
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addNotify()
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{
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if (peer != null)
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peer = getToolkit ().createMenuItem (this);
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}
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/*************************************************************************/
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/**
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* Adds the specified listener to the list of registered action listeners
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* for this component.
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*
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* @param listener The listener to add.
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*/
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public synchronized void
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addActionListener(ActionListener listener)
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{
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action_listeners = AWTEventMulticaster.add(action_listeners, listener);
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enableEvents(AWTEvent.ACTION_EVENT_MASK);
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}
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public synchronized void
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removeActionListener(ActionListener l)
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{
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action_listeners = AWTEventMulticaster.remove(action_listeners, l);
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}
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/** Returns all registered EventListers of the given listenerType.
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* listenerType must be a subclass of EventListener, or a
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* ClassClassException is thrown.
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* @since 1.3
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*/
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public EventListener[]
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getListeners(Class listenerType)
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{
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if (listenerType == ActionListener.class)
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return Component.getListenersImpl(listenerType, action_listeners);
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else
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return Component.getListenersImpl(listenerType, null);
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}
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/*************************************************************************/
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void
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dispatchEventImpl(AWTEvent e)
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{
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if (e.id <= ActionEvent.ACTION_LAST
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&& e.id >= ActionEvent.ACTION_FIRST
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&& (action_listeners != null
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|| (eventMask & AWTEvent.ACTION_EVENT_MASK) != 0))
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processEvent(e);
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}
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/**
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* Processes the specified event by calling <code>processActionEvent()</code>
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* if it is an instance of <code>ActionEvent</code>.
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*
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* @param event The event to process.
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*/
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protected void
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processEvent(AWTEvent event)
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{
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if (event instanceof ActionEvent)
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processActionEvent((ActionEvent)event);
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}
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/*************************************************************************/
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/**
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* Processes the specified event by dispatching it to any registered listeners.
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*
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* @param event The event to process.
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*/
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protected void
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processActionEvent(ActionEvent event)
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{
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if (action_listeners != null)
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action_listeners.actionPerformed(event);
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}
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/*************************************************************************/
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/**
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* Returns a debugging string for this object.
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*
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* @return A debugging string for this object.
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*/
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public String
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paramString()
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{
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return ("label=" + label + ",enabled=" + enabled +
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",actionCommand=" + actionCommand + "," + super.paramString());
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}
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// Accessibility API not yet implemented.
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// public AccessibleContext getAccessibleContext()
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} // class MenuItem
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