menucomponent.java

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/* MenuComponent.java -- Superclass of all AWT menu components
   Copyright (C) 1999, 2000, 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.

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.MenuComponentPeer;

// FIXME: Java 1.0 event model unimplemented

/**
  * This is the superclass of all non-menu AWT widgets. 
  *
  * @author Aaron M. Renn ([e-mail])
  */
public abstract class MenuComponent implements java.io.Serializable
{

/*
 * Static Variables
 */

// Serialization Constant
private static final long serialVersionUID = -4536902356223894379L;

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

/*
 * Instance Variables
 */

  // FIXME: missing serialized fields `nameExplicitlySet',
  // `newEventsOnly', and `accessibleContext'.

// The font for this component
private Font font;

// The name of the component
private String name;

// The parent of this component
transient MenuContainer parent;

// The native peer for this componet
transient MenuComponentPeer peer;

// The synchronization locking object for this component
private transient Object tree_lock = this;

// The toolkit for this object
private static transient Toolkit toolkit = Toolkit.getDefaultToolkit();

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

/*
 * Constructors
 */

/**
  * Default constructor for subclasses.
  *
  * @exception HeadlessException If GraphicsEnvironment.isHeadless() is true.
  */
protected
MenuComponent()
{
  if (GraphicsEnvironment.isHeadless())
    throw new HeadlessException ();
}

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

/*
 * Instance Methods
 */

/**
  * Returns the font in use for this component.
  *
  * @return The font for this component.
  */
public Font
getFont()
{
  return(font);
}

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

/**
  * Sets the font for this component to the specified font.
  *
  * @param font The new font for this component.
  */
public void
setFont(Font font)
{
  this.font = font;
}

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

/**
  * Returns the name of this component.
  *
  * @return The name of this component.
  */
public String
getName()
{
  return(name);
}

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

/**
  * Sets the name of this component to the specified name.
  *
  * @param name The new name of this component.
  */
public void
setName(String name)
{
  this.name = name;
}

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

/**
  * Returns the parent of this component.
  * 
  * @return The parent of this component.
  */
public MenuContainer
getParent()
{
  return(parent);
} 

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

// Sets the parent of this component.
final void
setParent(MenuContainer parent)
{
  this.parent = parent;
}

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

/**
  * Returns the native windowing system peer for this component.
  *
  * @return The peer for this component.
  */
public MenuComponentPeer
getPeer()
{
  return(peer);
}

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

// Sets the peer for this component.
final void
setPeer(MenuComponentPeer peer)
{
  this.peer = peer;
}

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

/**
  * Destroys this component's native peer
  */
public void
removeNotify()
{
  if (peer != null)
    peer.dispose();
  peer = null;
}

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

/**
  * Returns the toolkit in use for this component.
  *
  * @return The toolkit for this component.
  */
final Toolkit
getToolkit()
{
  return(toolkit);
}

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

/**
  * Returns the object used for synchronization locks on this component
  * when performing tree and layout functions.
  *
  * @return The synchronization lock for this component.
  */
protected final Object
getTreeLock()
{
  return(tree_lock);
}

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

// The sync lock object for this component.
final void
setTreeLock(Object tree_lock)
{
  this.tree_lock = tree_lock;
}

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

/**
  * AWT 1.0 event dispatcher.
  *
  * @deprecated Deprecated in favor of <code>dispatchEvent()</code>.
  */
public boolean
postEvent(Event event)
{
  return(false);
}

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

/**
  * Sends this event to this component or a subcomponent for processing.
  *
  * @param event The event to dispatch
  */
public final void
dispatchEvent(AWTEvent event)
{
  // See comment in Component.dispatchEvent().
  dispatchEventImpl(event);
}

void
dispatchEventImpl(AWTEvent e)
{
  // This is overridden by subclasses that support events.
}

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

/**
  * Processes the specified event.  In this class, this method simply
  * calls one of the more specific event handlers.
  * 
  * @param event The event to process.
  */
protected void
processEvent(AWTEvent event)
{
}

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

/**
  * Returns a string representation of this component.
  *
  * @return A string representation of this component
  */
public String
toString()
{
  return this.getClass().getName() + "[" + paramString() + "]";
}

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

/**
  * Returns a debugging string for this component
  */
protected String
paramString()
{
  return "name=" + getName();
}

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

} // class Component