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From-SVN: r102074

1 files changed, 355 insertions, 0 deletions

diff --git a/libjava/classpath/java/awt/CheckboxMenuItem.java b/libjava/classpath/java/awt/CheckboxMenuItem.java
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+/* CheckboxMenuItem.java -- A menu option with a checkbox on it.
+   Copyright (C) 1999, 2000, 2001, 2002, 2004, 2005  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.event.ItemEvent;
+import java.awt.event.ItemListener;
+import java.awt.peer.CheckboxMenuItemPeer;
+import java.util.EventListener;
+
+import javax.accessibility.Accessible;
+import javax.accessibility.AccessibleAction;
+import javax.accessibility.AccessibleContext;
+import javax.accessibility.AccessibleValue;
+
+/**
+  * This class implements a menu item that has a checkbox on it indicating
+  * the selected state of some option.
+  *
+  * @author Aaron M. Renn (arenn@urbanophile.com)
+  * @author Tom Tromey (tromey@redhat.com)
+  */
+public class CheckboxMenuItem extends MenuItem
+  implements ItemSelectable, Accessible
+{
+
+/*
+ * Static Variables
+ */
+
+// Serialization constant
+private static final long serialVersionUID = 6190621106981774043L;
+
+/*
+ * Instance Variables
+ */
+
+/**
+  * @serial The state of the checkbox, with <code>true</code> being on and
+  * <code>false</code> being off.
+  */
+private boolean state;
+
+// List of registered ItemListeners
+private transient ItemListener item_listeners;
+
+/*************************************************************************/
+
+/*
+ * Constructors
+ */
+
+/**
+  * Initializes a new instance of <code>CheckboxMenuItem</code> with no
+  * label and an initial state of off.
+  *
+  * @exception HeadlessException If GraphicsEnvironment.isHeadless()
+  * returns true.
+  */
+public
+CheckboxMenuItem()
+{
+  this("", false);
+}
+
+/*************************************************************************/
+
+/**
+  * Initializes a new instance of <code>CheckboxMenuItem</code> with the
+  * specified label and an initial state of off.
+  *
+  * @param label The label of the menu item.
+  *
+  * @exception HeadlessException If GraphicsEnvironment.isHeadless()
+  * returns true.
+  */
+public
+CheckboxMenuItem(String label)
+{
+  this(label, false);
+}
+
+/*************************************************************************/
+
+/**
+  * Initializes a new instance of <code>CheckboxMenuItem</code> with the
+  * specified label and initial state.
+  *
+  * @param label The label of the menu item.
+  * @param state The initial state of the menu item, where <code>true</code>
+  * is on, and <code>false</code> is off.
+  *
+  * @exception HeadlessException If GraphicsEnvironment.isHeadless()
+  * returns true.
+  */
+public
+CheckboxMenuItem(String label, boolean state)
+{
+  super(label);
+  this.state = state;
+
+  if (GraphicsEnvironment.isHeadless())
+    throw new HeadlessException ();
+}
+
+/*************************************************************************/
+
+/*
+ * Instance Methods
+ */
+
+/**
+  * Returns the state of this menu item.
+  *
+  * @return The state of this menu item.
+  */
+public boolean
+getState()
+{
+  return(state);
+}
+
+/*************************************************************************/
+
+/**
+  * Sets the state of this menu item.
+  *
+  * @param state The initial state of the menu item, where <code>true</code>
+  * is on, and <code>false</code> is off.
+  */
+public synchronized void
+setState(boolean state)
+{
+  this.state = state;
+  if (peer != null)
+    {
+      CheckboxMenuItemPeer cp = (CheckboxMenuItemPeer) peer;
+      cp.setState (state);
+    }
+}
+
+/*************************************************************************/
+
+/**
+  * Returns an array of length 1 with the menu item label for this object
+  * if the state is on.  Otherwise <code>null</code> is returned.
+  *
+  * @return An array with this menu item's label if it has a state of on,
+  * or <code>null</code> otherwise.
+  */
+public Object[]
+getSelectedObjects()
+{
+  if (state == false)
+    return(null);
+
+  Object[] obj = new Object[1];
+  obj[0] = getLabel();
+
+  return(obj);
+}
+
+/*************************************************************************/
+
+/**
+  * Create's this object's native peer
+  */
+public synchronized void
+addNotify()
+{
+  if (peer == null)
+    peer = getToolkit().createCheckboxMenuItem(this);
+
+  super.addNotify ();
+}
+
+/*************************************************************************/
+
+/**
+  * Adds the specified listener to the list of registered item listeners
+  * for this object.
+  *
+  * @param listener The listener to add.
+  */
+public synchronized void
+addItemListener(ItemListener listener)
+{
+  item_listeners = AWTEventMulticaster.add(item_listeners, listener);
+
+  enableEvents(AWTEvent.ITEM_EVENT_MASK);
+}
+
+/*************************************************************************/
+
+/**
+  * Removes the specified listener from the list of registered item
+  * listeners for this object.
+  *
+  * @param listener The listener to remove.
+  */
+public synchronized void
+removeItemListener(ItemListener listener)
+{
+  item_listeners = AWTEventMulticaster.remove(item_listeners, listener);
+}
+
+/*************************************************************************/
+
+/**
+  * Processes the specified event by calling <code>processItemEvent()</code>
+  * if it is an instance of <code>ItemEvent</code> or calling the superclass
+  * method otherwise.
+  *
+  * @param event The event to process.
+  */
+protected void
+processEvent(AWTEvent event)
+{
+  if (event instanceof ItemEvent)
+    processItemEvent((ItemEvent)event);
+  else
+    super.processEvent(event);
+}
+
+/*************************************************************************/
+
+/**
+  * Processes the specified event by dispatching it to any registered listeners.
+  *
+  * @param event The event to process.
+  */
+protected void
+processItemEvent(ItemEvent event)
+{
+  if (item_listeners != null)
+    item_listeners.itemStateChanged(event);
+}
+
+void
+dispatchEventImpl(AWTEvent e)
+{
+  if (e instanceof ItemEvent)
+    {
+      synchronized (this)
+        {
+          state = (((ItemEvent) e).getStateChange() == ItemEvent.SELECTED);
+        }
+    }
+
+  if (e.id <= ItemEvent.ITEM_LAST 
+      && e.id >= ItemEvent.ITEM_FIRST
+      && (item_listeners != null 
+	  || (eventMask & AWTEvent.ITEM_EVENT_MASK) != 0))
+    processEvent(e);
+  else
+    super.dispatchEventImpl(e);
+}
+
+/*************************************************************************/
+
+/**
+  * Returns a debugging string for this object.
+  *
+  * @return A debugging string for this object.
+  */
+public String
+paramString()
+{
+  return ("label=" + getLabel() + ",state=" + state
+	  + "," + super.paramString());
+}
+
+  /**
+   * Returns an array of all the objects currently registered as FooListeners
+   * upon this <code>CheckboxMenuItem</code>. FooListeners are registered using
+   * the addFooListener method.
+   *
+   * @exception ClassCastException If listenerType doesn't specify a class or
+   * interface that implements java.util.EventListener.
+   */
+  public EventListener[] getListeners (Class listenerType)
+  {
+    if (listenerType == ItemListener.class)
+      return AWTEventMulticaster.getListeners (item_listeners, listenerType); 
+	      
+    return super.getListeners (listenerType);
+  }
+
+  /**
+   * Returns an aray of all item listeners currently registered to this
+   * <code>CheckBoxMenuItem</code>.
+   */
+  public ItemListener[] getItemListeners ()
+  {
+    return (ItemListener[]) getListeners (ItemListener.class);
+  }
+
+
+  protected class AccessibleAWTCheckboxMenuItem extends AccessibleAWTMenuItem
+    implements AccessibleAction, AccessibleValue
+  {
+    // I think the base class provides the necessary implementation
+  }
+  
+  /**
+   * Gets the AccessibleContext associated with this <code>CheckboxMenuItem</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 AccessibleAWTCheckboxMenuItem();
+    return accessibleContext;
+  }
+
+} // class CheckboxMenuItem
+