gcc/libjava/java/awt/Menu.java

/* Menu.java -- A Java AWT Menu
   Copyright (C) 1999, 2002 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., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA.

As a special exception, if you link this library with other files to
produce an executable, this library does not by itself cause the
resulting executable to be covered by the GNU General Public License.
This exception does not however invalidate any other reasons why the
executable file might be covered by the GNU General Public License. */


package java.awt;

import java.awt.peer.MenuPeer;
import java.awt.peer.MenuItemPeer;
import java.awt.peer.MenuComponentPeer;
import java.io.Serializable;
import java.util.Vector;
import java.util.Enumeration;

/**
  * This class represents a pull down or tear off menu in Java's AWT.
  *
  * @author Aaron M. Renn (arenn@urbanophile.com)
  */
public class Menu extends MenuItem implements MenuContainer, Serializable
{

/*
 * Static Variables
 */

// Serialization Constant
private static final long serialVersionUID = -8809584163345499784L;

/*************************************************************************/

/*
 * Instance Variables
 */

/**
  * @serial The actual items in the menu
  */
private Vector items = new Vector();

/**
  * @serial Flag indicating whether or not this menu is a tear off
  */
private boolean isTearOff;

/**
  * @serial Indicates whether or not this is a help menu.
  */
private boolean isHelpMenu;

// From the serialization spec.  FIXME: what should it be?
private int menuSerializedDataVersion;

static final MenuItem separator = new MenuItem("-");

/*************************************************************************/

/*
 * Constructors
 */

/**
  * Initializes a new instance of <code>Menu</code> with no label and that
  * is not a tearoff;
  */
public
Menu()
{
}

/*************************************************************************/

/**
  * Initializes a new instance of <code>Menu</code> that is not a tearoff and
  * that has the specified label.
  *
  * @param label The menu label.
  */
public
Menu(String label)
{
  this(label, false);
}

/*************************************************************************/

/**
  * Initializes a new instance of <code>Menu</code> with the specified
  * label and tearoff status.
  *
  * @param label The label for this menu
  * @param isTearOff <code>true</code> if this menu is a tear off menu,
  * <code>false</code> otherwise.
  */
public
Menu(String label, boolean isTearOff)
{
  super(label);

  this.isTearOff = isTearOff;

  if (label.equals("Help"))
    isHelpMenu = true;
}

/*************************************************************************/

/*
 * Instance Methods
 */

/**
  * Tests whether or not this menu is a tearoff.
  *
  * @return <code>true</code> if this menu is a tearoff, <code>false</code>
  * otherwise.
  */
public boolean
isTearOff()
{
  return(isTearOff);
}

/*************************************************************************/

/**
  * Returns the number of items in this menu.
  *
  * @return The number of items in this menu.
  */
public int
getItemCount()
{
  return(items.size());
}
 
/*************************************************************************/

/**
  * Returns the number of items in this menu.
  *
  * @return The number of items in this menu.
  *
  * @deprecated This method is deprecated in favor of <code>getItemCount()</code>.
  */
public int
count()
{
  return(items.size());
}
 
/*************************************************************************/

/**
  * Returns the item at the specified index.
  *
  * @return The item at the specified index.
  *
  * @exception ArrayIndexOutOfBoundsException If the index value is not valid.
  */
public MenuItem
getItem(int index)
{
  return((MenuItem)items.elementAt(index));
}

/*************************************************************************/

/**
  * Adds the specified item to this menu.  If it was previously part of
  * another menu, it is first removed from that menu.
  *
  * @param item The new item to add.
  *
  * @return The item that was added.
  */
public MenuItem
add(MenuItem item)
{
  items.addElement(item);
  if (item.parent != null)
    {
      item.parent.remove(item);
    }
  item.parent = this;

  if (peer != null)
    {
      MenuPeer mp = (MenuPeer) peer;
      mp.addItem(item);
    }

  return item;
}

/*************************************************************************/

/**
  * Add an item with the specified label to this menu.
  *
  * @param label The label of the menu item to add.
  */
public void
add(String label)
{
  add(new MenuItem(label));
}

/*************************************************************************/

/**
  * Inserts the specified menu item into this menu at the specified index.
  *
  * @param item The menu item to add.
  * @param index The index of the menu item.
  *
  * XXX: FIXME
  *
  * @exception IllegalArgumentException If the index is less than zero.
  * @exception ArrayIndexOutOfBoundsException If the index is otherwise invalid.
  */
public void
insert(MenuItem item, int index)
{
  if (index < 0)
    throw new IllegalArgumentException("Index is less than zero");

  items.insertElementAt(item, index);

  MenuPeer mp = (MenuPeer)getPeer();
  // FIXME: Need to add a peer method here.
//    if (mp != null)
//      mp.insertItem(item, index);
}

/*************************************************************************/

/**
  * Inserts an item with the specified label into this menu at the specified index.
  *
  * @param label The label of the item to add.
  * @param index The index of the menu item.
  *
  * @exception IllegalArgumentException If the index is less than zero.
  * @exception ArrayIndexOutOfBoundsException If the index is otherwise invalid.
  */
public void
insert(String label, int index)
{
  insert(new MenuItem(label), index);
}

/*************************************************************************/

/**
  * Adds a separator bar at the current menu location.
  */
public void
addSeparator()
{
  add(separator);
}

/*************************************************************************/

/**
  * Inserts a separator bar at the specified index value.
  *
  * @param index The index at which to insert a separator bar.
  *
  * XXX: FIXME
  *
  * @exception IllegalArgumentException If the index is less than zero.
  * @exception ArrayIndexOutOfBoundsException If the index is otherwise invalid.
  */
public void
insertSeparator(int index)
{
  insert(separator, index);
}

/*************************************************************************/

/**
  * Deletes the item at the specified index from this menu.
  *
  * @param index The index of the item to remove.
  * 
  * @exception ArrayIndexOutOfBoundsException If the index is otherwise invalid.
  */
public synchronized void
remove(int index)
{
  items.removeElementAt(index);

  MenuPeer mp = (MenuPeer)getPeer();
  if (mp != null)
    mp.delItem(index);
}

/*************************************************************************/

/**
  * Removes the specifed item from the menu.  If the specified component
  * does not exist, this method does nothing. // FIXME: Right?
  *
  * @param item The component to remove.
  */
public void
remove(MenuComponent item)
{
  int index = items.indexOf(item);
  if (index == -1)
    return;

  remove(index);
}

/*************************************************************************/

/**
  * Removes all the elements from this menu.
  */
public synchronized void
removeAll()
{
  int count = getItemCount();
  for(int i = 0; i < count; i++)
    {
      // We must always remove item 0.
      remove(0);
    }
}

/*************************************************************************/

/**
  * Creates the native peer for this object.
  */
public void
addNotify()
{
  if (peer != null)
    peer = getToolkit().createMenu(this);
  super.addNotify ();
}

/*************************************************************************/

/**
  * Destroys the native peer for this object.
  */
public void
removeNotify()
{
  super.removeNotify();
}

/*************************************************************************/

/**
  * Returns a debugging string for this menu.
  *
  * @return A debugging string for this menu.
  */
public String
paramString()
{
  return (",isTearOff=" + isTearOff + ",isHelpMenu=" + isHelpMenu
	  + super.paramString());
}

// Accessibility API not yet implemented.
// public AccessibleContext getAccessibleContext()

} // class Menu