list.java

gcc的组建

{
  return(visibleIndex);
}

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

/**
  * Makes the item at the specified index selected.
  *
  * @param index The index of the item to select.
  */
public synchronized void
select(int index)
{
  ListPeer lp = (ListPeer)getPeer();
  if (lp != null)
    lp.select(index);
}

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

/**
  * Makes the item at the specified index not selected.
  *
  * @param index The index of the item to unselect.
  */
public synchronized void
deselect(int index)
{
  ListPeer lp = (ListPeer)getPeer();
  if (lp != null)
    lp.deselect(index);
}

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

/**
  * Notifies this object to create its native peer.
  */
public void
addNotify()
{
  if (peer == null)
    peer = getToolkit ().createList (this);
  super.addNotify ();
}

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

/**
  * Notifies this object to destroy its native peer.
  */
public void
removeNotify()
{
  super.removeNotify();
}

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

/**
  * Adds the specified <code>ActionListener</code> to the list of
  * registered listeners for this object.
  *
  * @param listener The listener to add.
  */
public synchronized void
addActionListener(ActionListener listener)
{
  action_listeners = AWTEventMulticaster.add(action_listeners, listener);
}

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

/**
  * Removes the specified <code>ActionListener</code> from the list of
  * registers listeners for this object.
  *
  * @param listener The listener to remove.
  */
public synchronized void
removeActionListener(ActionListener listener)
{
  action_listeners = AWTEventMulticaster.remove(action_listeners, listener);
}

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

/**
  * Adds the specified <code>ItemListener</code> to the list of
  * registered listeners for this object.
  *
  * @param listener The listener to add.
  */
public synchronized void
addItemListener(ItemListener listener)
{
  item_listeners = AWTEventMulticaster.add(item_listeners, listener);
}

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

/**
  * Removes the specified <code>ItemListener</code> from the list of
  * registers 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 for this object.  If the event is an
  * instance of <code>ActionEvent</code> then the
  * <code>processActionEvent()</code> method is called.  Similarly, if the
  * even is an instance of <code>ItemEvent</code> then the
  * <code>processItemEvent()</code> method is called.  Otherwise the
  * superclass method is called to process this event.
  *
  * @param event The event to process.
  */
protected void
processEvent(AWTEvent event)
{
  if (event instanceof ActionEvent)
    processActionEvent((ActionEvent)event);
  else if (event instanceof ItemEvent)
    processItemEvent((ItemEvent)event);
  else
    super.processEvent(event);
}

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

/**
  * This method processes the specified event by dispatching it to any
  * registered listeners.  Note that this method will only get called if
  * action events are enabled.  This will happen automatically if any
  * listeners are added, or it can be done "manually" by calling
  * the <code>enableEvents()</code> method.
  *
  * @param event The event to process.
  */
protected void 
processActionEvent(ActionEvent event)
{
  if (action_listeners != null)
    action_listeners.actionPerformed(event);
}

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

/**
  * This method processes the specified event by dispatching it to any
  * registered listeners.  Note that this method will only get called if
  * item events are enabled.  This will happen automatically if any
  * listeners are added, or it can be done "manually" by calling
  * the <code>enableEvents()</code> method.
  *
  * @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.id <= ItemEvent.ITEM_LAST
      && e.id >= ItemEvent.ITEM_FIRST
      && (item_listeners != null 
	  || (eventMask & AWTEvent.ITEM_EVENT_MASK) != 0))
    processEvent(e);
  else if (e.id <= ActionEvent.ACTION_LAST 
	   && e.id >= ActionEvent.ACTION_FIRST
	   && (action_listeners != null 
	       || (eventMask & AWTEvent.ACTION_EVENT_MASK) != 0))
    processEvent(e);
  else
    super.dispatchEventImpl(e);
}

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

/**
  * Returns a debugging string for this object.
  *
  * @return A debugging string for this object.
  */
protected String
paramString()
{
  return "multiple=" + multipleMode + ",rows=" + rows + super.paramString();
}

  /**
   * Returns an array of all the objects currently registered as FooListeners
   * upon this <code>List</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 == ActionListener.class)
      return AWTEventMulticaster.getListeners (action_listeners, listenerType);
    
    if (listenerType == ItemListener.class)
      return AWTEventMulticaster.getListeners (item_listeners, listenerType);

    return super.getListeners (listenerType);
  }

  /**
   * Returns all action listeners registered to this object.
   */
  public ActionListener[] getActionListeners ()
  {
    return (ActionListener[]) getListeners (ActionListener.class);
  }
  
  /**
   * Returns all action listeners registered to this object.
   */
  public ItemListener[] getItemListeners ()
  {
    return (ItemListener[]) getListeners (ItemListener.class);
  }
  
  // Accessibility internal class 
  protected class AccessibleAWTList extends AccessibleAWTComponent
    implements AccessibleSelection, ItemListener, ActionListener
  {
    private static final long serialVersionUID = 7924617370136012829L;

    protected class AccessibleAWTListChild extends AccessibleAWTComponent
      implements Accessible
    {
      private static final long serialVersionUID = 4412022926028300317L;
      
      // Field names are fixed by serialization spec.
      private List parent;
      private int indexInParent;
      
      public AccessibleAWTListChild(List parent, int indexInParent)
      {
        this.parent = parent;
        this.indexInParent = indexInParent;
        if (parent == null)
          this.indexInParent = -1;
      }
      
      /* (non-Javadoc)
       * @see javax.accessibility.Accessible#getAccessibleContext()
       */
      public AccessibleContext getAccessibleContext()
      {
        return this;
      }
      
      public AccessibleRole getAccessibleRole()
      {
        return AccessibleRole.LIST_ITEM;
      }
      
      public AccessibleStateSet getAccessibleStateSet()
      {
        AccessibleStateSet states = super.getAccessibleStateSet();
        if (parent.isIndexSelected(indexInParent))
          states.add(AccessibleState.SELECTED);
        return states;
      }
      
      public int getAccessibleIndexInParent()
      {
        return indexInParent;
      }

    }
    
    public AccessibleAWTList()
    {
      addItemListener(this);
      addActionListener(this);
    }
    
    public AccessibleRole getAccessibleRole()
    {
      return AccessibleRole.LIST;
    }
    
    public AccessibleStateSet getAccessibleStateSet()
    {
      AccessibleStateSet states = super.getAccessibleStateSet();
      states.add(AccessibleState.SELECTABLE);
      if (isMultipleMode())
        states.add(AccessibleState.MULTISELECTABLE);
      return states;
    }

    public int getAccessibleChildrenCount()
    {
      return getItemCount();
    }

    public Accessible getAccessibleChild(int i)
    {
      if (i >= getItemCount())
        return null;
      return new AccessibleAWTListChild(List.this, i);
    }
    
    /* (non-Javadoc)
     * @see javax.accessibility.AccessibleSelection#getAccessibleSelectionCount()
     */
    public int getAccessibleSelectionCount()
    {
      return getSelectedIndexes().length;
    }

    /* (non-Javadoc)
     * @see javax.accessibility.AccessibleSelection#getAccessibleSelection()
     */
    public AccessibleSelection getAccessibleSelection()
    {
      return this;
    }

    /* (non-Javadoc)
     * @see javax.accessibility.AccessibleSelection#getAccessibleSelection(int)
     */
    public Accessible getAccessibleSelection(int i)
    {
      int[] items = getSelectedIndexes();
      if (i >= items.length)
        return null;
      return new AccessibleAWTListChild(List.this, items[i]);
    }

    /* (non-Javadoc)
     * @see javax.accessibility.AccessibleSelection#isAccessibleChildSelected(int)
     */
    public boolean isAccessibleChildSelected(int i)
    {
      return isIndexSelected(i);
    }

    /* (non-Javadoc)
     * @see javax.accessibility.AccessibleSelection#addAccessibleSelection(int)
     */
    public void addAccessibleSelection(int i)
    {
      select(i);
    }

    /* (non-Javadoc)
     * @see javax.accessibility.AccessibleSelection#removeAccessibleSelection(int)
     */
    public void removeAccessibleSelection(int i)
    {
      deselect(i);
    }

    /* (non-Javadoc)
     * @see javax.accessibility.AccessibleSelection#clearAccessibleSelection()
     */
    public void clearAccessibleSelection()
    {
      for (int i = 0; i < getItemCount(); i++)
        deselect(i);
    }

    /* (non-Javadoc)
     * @see javax.accessibility.AccessibleSelection#selectAllAccessibleSelection()
     */
    public void selectAllAccessibleSelection()
    {
      if (isMultipleMode())
        for (int i = 0; i < getItemCount(); i++)
          select(i);
    }

    /* (non-Javadoc)
     * @see java.awt.event.ItemListener#itemStateChanged(java.awt.event.ItemEvent)
     */
    public void itemStateChanged(ItemEvent event)
    {
    }

    /* (non-Javadoc)
     * @see java.awt.event.ActionListener#actionPerformed(java.awt.event.ActionEvent)
     */
    public void actionPerformed(ActionEvent event)
    {
    }
    
  }

  /**
   * Gets the AccessibleContext associated with this <code>List</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 AccessibleAWTList();
    return accessibleContext;
  }
} // class List