624 lines
15 KiB
Java
624 lines
15 KiB
Java
/* MenuItem.java -- An item in a menu
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Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004 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., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 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.event.ActionEvent;
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import java.awt.event.ActionListener;
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import java.awt.peer.MenuItemPeer;
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import java.io.Serializable;
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import java.lang.reflect.Array;
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import java.util.EventListener;
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import javax.accessibility.Accessible;
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import javax.accessibility.AccessibleAction;
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import javax.accessibility.AccessibleContext;
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import javax.accessibility.AccessibleRole;
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import javax.accessibility.AccessibleValue;
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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
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implements Serializable, Accessible
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{
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/*
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* Static Variables
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*/
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/**
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* The number used to generate the name returned by getName.
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*/
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private static transient long next_menuitem_number;
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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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* This is package-private to avoid an accessor method.
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*/
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String actionCommand;
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/**
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* @serial Indicates whether or not this menu item is enabled.
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* This is package-private to avoid an accessor method.
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*/
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boolean enabled = true;
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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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long eventMask;
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/**
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* @serial This menu item's label
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* This is package-private to avoid an accessor method.
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*/
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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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protected class AccessibleAWTMenuItem
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extends MenuComponent.AccessibleAWTMenuComponent
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implements AccessibleAction, AccessibleValue
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{
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private static final long serialVersionUID = -217847831945965825L;
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/** Constructor */
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protected AccessibleAWTMenuItem()
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{
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super();
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}
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public String getAccessibleName()
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{
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return label;
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}
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public AccessibleAction getAccessibleAction()
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{
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return this;
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}
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public AccessibleRole getAccessibleRole()
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{
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return AccessibleRole.MENU_ITEM;
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}
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/* (non-Javadoc)
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* @see javax.accessibility.AccessibleAction#getAccessibleActionCount()
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*/
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public int getAccessibleActionCount()
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{
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return 1;
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}
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/* (non-Javadoc)
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* @see javax.accessibility.AccessibleAction#getAccessibleActionDescription(int)
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*/
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public String getAccessibleActionDescription(int i)
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{
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if (i == 0)
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return label;
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else
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return null;
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}
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/* (non-Javadoc)
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* @see javax.accessibility.AccessibleAction#doAccessibleAction(int)
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*/
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public boolean doAccessibleAction(int i)
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{
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if (i != 0)
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return false;
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processActionEvent(new ActionEvent(this, ActionEvent.ACTION_PERFORMED, actionCommand));
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return true;
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}
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public AccessibleValue getAccessibleValue()
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{
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return this;
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}
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/* (non-Javadoc)
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* @see javax.accessibility.AccessibleValue#getCurrentAccessibleValue()
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*/
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public Number getCurrentAccessibleValue()
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{
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return (enabled) ? new Integer(1) : new Integer(0);
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}
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/* (non-Javadoc)
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* @see javax.accessibility.AccessibleValue#setCurrentAccessibleValue(java.lang.Number)
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*/
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public boolean setCurrentAccessibleValue(Number number)
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{
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boolean result = (number.intValue() != 0);
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// this. is required by javac 1.3, otherwise it is confused with
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// MenuItem.this.setEnabled.
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this.setEnabled(result);
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return result;
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}
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/* (non-Javadoc)
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* @see javax.accessibility.AccessibleValue#getMinimumAccessibleValue()
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*/
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public Number getMinimumAccessibleValue()
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{
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return new Integer(0);
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}
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/* (non-Javadoc)
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* @see javax.accessibility.AccessibleValue#getMaximumAccessibleValue()
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*/
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public Number getMaximumAccessibleValue()
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{
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return new Integer(0);
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}
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}
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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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enable (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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* @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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if (enabled)
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enable ();
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else
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disable ();
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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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if (enabled)
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return;
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this.enabled = true;
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if (peer != null)
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((MenuItemPeer) peer).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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if (!enabled)
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return;
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this.enabled = false;
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if (peer != null)
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((MenuItemPeer) peer).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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if (actionCommand == null)
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return label;
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else
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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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public synchronized ActionListener[] getActionListeners()
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{
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return (ActionListener[])
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AWTEventMulticaster.getListeners(action_listeners,
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ActionListener.class);
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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 <T extends EventListener> T[] getListeners(Class<T> listenerType)
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{
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if (listenerType == ActionListener.class)
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return (T[]) getActionListeners();
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return (T[]) Array.newInstance(listenerType, 0);
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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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// Send the event to the parent menu if it has not yet been
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// consumed.
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if (!e.isConsumed ())
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((Menu) getParent ()).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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{
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event.setSource(this);
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action_listeners.actionPerformed(event);
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}
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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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/**
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* Gets the AccessibleContext associated with this <code>MenuItem</code>.
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* The context is created, if necessary.
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*
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* @return the associated context
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*/
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public AccessibleContext getAccessibleContext()
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{
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/* Create the context if this is the first request */
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if (accessibleContext == null)
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accessibleContext = new AccessibleAWTMenuItem();
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return accessibleContext;
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}
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/**
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* Generate a unique name for this <code>MenuItem</code>.
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*
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* @return A unique name for this <code>MenuItem</code>.
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*/
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String generateName()
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{
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return "menuitem" + getUniqueLong();
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}
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private static synchronized long getUniqueLong()
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{
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return next_menuitem_number++;
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}
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} // class MenuItem
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