AWTEventMulticaster.java   [plain text]

/* Copyright (C) 1999, 2000, 2002  Free Software Foundation

This file is part of GNU Classpath.

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package java.awt;

import java.awt.event.*;
import java.util.EventListener;
import java.io.ObjectOutputStream;

/* Written using on-line Java 2 Platform Standard Edition v1.3 API 
 * Specification, as well as "The Java Class Libraries", 2nd edition 
 * (Addison-Wesley, 1998).
 * Status:  Believed complete and correct to J2SE 1.3, except for 
 * serialization support methods, save() and saveInternal(), which are 
 * stubbed.
 */

/**
  * This class is used to implement a chain of event handlers.  Dispatching
  * using this class is thread safe.  Here is a quick example of how to
  * add and delete listeners using this class.  For this example, we will
  * assume are firing <code>AdjustableEvent</code>'s.  However, this 
  * same approach is useful for all events in the <code>java.awt.event</code>
  * package, and more if this class is subclassed.
  * <p>
  * <code> 
  * AdjustmentListener al;
  * 
  * public void 
  * addAdjustmentListener(AdjustmentListener listener)
  * {
  *   al = AWTEventMulticaster.add(al, listener);
  * }
  *
  * public void
  * removeAdjustmentListener(AdjustmentListener listener)
  * {
  *   al = AWTEventMulticaster.remove(al, listener);
  * }
  * </code>
  * <p>
  * When it come time to process an event, simply call <code>al</code>,
  * assuming it is not <code>null</code>.
  * <p>
  * The first time <code>add</code> is called it is passed
  * <code>null</code> and <code>listener</code> as its arguments.  This
  * starts building the chain.  This class returns <code>listener</code>
  * which becomes the new <code>al</code>.  The next time, <code>add</code>
  * is called with <code>al</code> and <code>listener</code> and the
  * new listener is then chained to the old.
  *
  * @author Bryce McKinlay
  * @author Aaron M. Renn (arenn@urbanophile.com)
  */
public class AWTEventMulticaster implements ComponentListener, 
  ContainerListener, FocusListener, KeyListener, MouseListener,
  MouseMotionListener, WindowListener, ActionListener, ItemListener, 
  AdjustmentListener, TextListener, InputMethodListener, HierarchyListener, 
  HierarchyBoundsListener
{
  /**
   * A variable in the event chain.
   */
  protected final EventListener a;

  /**
   * A variable in the event chain
   */
  protected final EventListener b;

  /**
   * Initializes a new instance of <code>AWTEventMulticaster</code> with
   * the specified event listener parameters.
   *
   * @param a The "a" listener object.
   * @param b The "b" listener object.
   */
  protected AWTEventMulticaster(EventListener a,
                        	EventListener b)
  {
    this.a = a;
    this.b = b;
  }

  /**
   * Chain <code>EventListener</code> b to a.
   *
   * @param a - Listener to chain to.
   * @param b - Listener to chain.
   *
   * @return Latest entry in the chain.
   */
  protected static EventListener addInternal(EventListener a, EventListener b)
  {
    if (a == null)
      return b;
    else if (b == null)
      return a;
    else return new AWTEventMulticaster(a, b);
  }

  /**
   * Removes the listener <code>old</code> from the listener <code>lis</code>.
   *
   * @param lis The listener to remove <code>old</code> from.
   * @param old The listener to remove.
   *
   * @return The resulting listener after the remove operation.
   */
  protected static EventListener removeInternal(EventListener l, 
						EventListener oldl)
  {
    if (l == oldl)
      return null;
    else if (l instanceof AWTEventMulticaster)
      {
	AWTEventMulticaster mc = (AWTEventMulticaster) l;
	return mc.remove(oldl);
      }
    return l;
  }

  /**
   * Removes the specified object from this multicaster object.  If the
   * object to remove is not part of this multicaster, then the remove
   * method on the parent multicaster (if it exists) is called and a 
   * new multicaster object is returned based on that object and this
   * multicaster's non-parent object.
   *
   * @param old The object to remove from this multicaster.
   *
   * @return The resulting multicaster with the specified listener removed.
   */
  protected EventListener remove(EventListener oldl)
  {
    // If oldl is an immediate child, return the other child.
    if (a == oldl)
      return b;
    if (b == oldl)
      return a;

    // If a and/or b are Multicaster's, search them recursively.
    if (a instanceof AWTEventMulticaster)
      {
        AWTEventMulticaster mc = (AWTEventMulticaster) a;
	EventListener newa = mc.remove(oldl);
	if (newa != a)
	  return new AWTEventMulticaster (newa, b);
      }    
    if (b instanceof AWTEventMulticaster)
      {
        AWTEventMulticaster mc = (AWTEventMulticaster) a;
	EventListener newb = mc.remove(oldl);
	if (newb != b)
	  return new AWTEventMulticaster (a, newb);
      }

    // oldl was not found.
    return this;
  }

  /**
   * Chain <code>ActionListener</code> b to a.
   *
   * @param a - Listener to chain to.
   * @param b - Listener to chain.
   *
   * @return Latest entry in the chain.
   */
  public static ActionListener add(ActionListener a, ActionListener b)
  {
    return (ActionListener) addInternal(a, b);
  }

  /**
   * Chain <code>AdjustmentListener</code> b to a.
   *
   * @param a - Listener to chain to.
   * @param b - Listener to chain.
   *
   * @return Latest entry in the chain.
   */
  public static AdjustmentListener add(AdjustmentListener a, 
				       AdjustmentListener b)
  {
    return (AdjustmentListener) addInternal(a, b);
  }				       

  /**
   * Chain <code>ComponentListener</code> b to a.
   *
   * @param a - Listener to chain to.
   * @param b - Listener to chain.
   *
   * @return Latest entry in the chain.
   */
  public static ComponentListener add(ComponentListener a, ComponentListener b)
  {
    return (ComponentListener) addInternal(a, b);
  }

  /**
   * Chain <code>ContainerListener</code> b to a.
   *
   * @param a - Listener to chain to.
   * @param b - Listener to chain.
   *
   * @return Latest entry in the chain.
   */
  public static ContainerListener add(ContainerListener a, ContainerListener b)
  {
    return (ContainerListener) addInternal(a, b);
  }

  /**
   * Chain <code>FocusListener</code> b to a.
   *
   * @param a - Listener to chain to.
   * @param b - Listener to chain.
   *
   * @return Latest entry in the chain.
   */
  public static FocusListener add(FocusListener a, FocusListener b) 
  {
    return (FocusListener) addInternal(a, b);
  }

  public static HierarchyBoundsListener add(HierarchyBoundsListener a, 
					    HierarchyBoundsListener b)
  {
    return (HierarchyBoundsListener) addInternal(a, b);
  }

  public static HierarchyListener add(HierarchyListener a, HierarchyListener b)
  {
    return (HierarchyListener) addInternal(a, b);
  }

  public static InputMethodListener add(InputMethodListener a, 
					InputMethodListener b)
  {
    return (InputMethodListener) addInternal(a, b);
  }

  /**
   * Chain <code>ItemListener</code> b to a.
   *
   * @param a - Listener to chain to.
   * @param b - Listener to chain.
   *
   * @return Latest entry in the chain.
   */
  public static ItemListener add(ItemListener a, ItemListener b)
  {
    return (ItemListener) addInternal(a, b);
  }

  /**
   * Chain <code>KeyListener</code> b to a.
   *
   * @param a - Listener to chain to.
   * @param b - Listener to chain.
   *
   * @return Latest entry in the chain.
   */
  public static KeyListener add(KeyListener a, KeyListener b)
  {
    return (KeyListener) addInternal(a, b);
  }

  /**
   * Chain <code>MouseListener</code> b to a.
   *
   * @param a - Listener to chain to.
   * @param b - Listener to chain.
   *
   * @return Latest entry in the chain.
   */
  public static MouseListener add(MouseListener a, MouseListener b)
  {
    return (MouseListener) addInternal(a, b);
  }

  /**
   * Chain <code>MouseMotionListener</code> b to a.
   *
   * @param a - Listener to chain to.
   * @param b - Listener to chain.
   *
   * @return Latest entry in the chain.
   */
  public static MouseMotionListener add(MouseMotionListener a, 
					MouseMotionListener b)
  {
    return (MouseMotionListener) addInternal(a, b);
  }

  /**
   * Chain <code>AdjustmentListener</code> b to a.
   *
   * @param a - Listener to chain to.
   * @param b - Listener to chain.
   *
   * @return Latest entry in the chain.
   */
  public static TextListener add(TextListener a, TextListener b)
  {
    return (TextListener) addInternal(a, b);
  }

  /**
   * Chain <code>WindowListener</code> b to a.
   *
   * @param a - Listener to chain to.
   * @param b - Listener to chain.
   *
   * @return Latest entry in the chain.
   */
  public static WindowListener add(WindowListener a, WindowListener b)
  {
    return (WindowListener) addInternal(a, b);
  }

  /**
   * Removes the listener <code>old</code> from the listener <code>lis</code>.
   *
   * @param lis The listener to remove <code>old</code> from.
   * @param old The listener to remove.
   *
   * @return The resulting listener after the remove operation.
   */
  public static ActionListener remove(ActionListener l, ActionListener oldl)
  {
    return (ActionListener) removeInternal(l, oldl);
  }

  /**
   * Removes the listener <code>old</code> from the listener <code>lis</code>.
   *
   * @param lis The listener to remove <code>old</code> from.
   * @param old The listener to remove.
   *
   * @return The resulting listener after the remove operation.
   */
  public static AdjustmentListener remove(AdjustmentListener l, 
					  AdjustmentListener oldl) 
  {
    return (AdjustmentListener) removeInternal(l, oldl);
  }

  /**
   * Removes the listener <code>old</code> from the listener <code>lis</code>.
   *
   * @param lis The listener to remove <code>old</code> from.
   * @param old The listener to remove.
   *
   * @return The resulting listener after the remove operation.
   */
  public static ComponentListener remove(ComponentListener l, 
					 ComponentListener oldl) 
  {
    return (ComponentListener) removeInternal(l, oldl);
  }

  /**
   * Removes the listener <code>old</code> from the listener <code>lis</code>.
   *
   * @param lis The listener to remove <code>old</code> from.
   * @param old The listener to remove.
   *
   * @return The resulting listener after the remove operation.
   */
  public static ContainerListener remove(ContainerListener l, 
					 ContainerListener oldl) 
  {
    return (ContainerListener) removeInternal(l, oldl);
  }

  /**
   * Removes the listener <code>old</code> from the listener <code>lis</code>.
   *
   * @param lis The listener to remove <code>old</code> from.
   * @param old The listener to remove.
   *
   * @return The resulting listener after the remove operation.
   */
  public static FocusListener remove(FocusListener l, FocusListener oldl) 
  {
    return (FocusListener) removeInternal(l, oldl);
  }

  public static HierarchyBoundsListener remove(HierarchyBoundsListener l,
                			       HierarchyBoundsListener oldl) 
  {
    return (HierarchyBoundsListener) removeInternal(l, oldl);
  }

  public static HierarchyListener remove(HierarchyListener l, 
					 HierarchyListener oldl) 
  {
    return (HierarchyListener) removeInternal(l, oldl);
  }

  public static InputMethodListener remove(InputMethodListener l, 
					   InputMethodListener oldl) 
  {
    return (InputMethodListener) removeInternal(l, oldl);
  }

  /**
   * Removes the listener <code>old</code> from the listener <code>lis</code>.
   *
   * @param lis The listener to remove <code>old</code> from.
   * @param old The listener to remove.
   *
   * @return The resulting listener after the remove operation.
   */
  public static ItemListener remove(ItemListener l, ItemListener oldl) 
  {
    return (ItemListener) removeInternal(l, oldl);
  }

  /**
   * Removes the listener <code>old</code> from the listener <code>lis</code>.
   *
   * @param lis The listener to remove <code>old</code> from.
   * @param old The listener to remove.
   *
   * @return The resulting listener after the remove operation.
   */
  public static KeyListener remove(KeyListener l, KeyListener oldl) 
  {
    return (KeyListener) removeInternal(l, oldl);
  }

  /**
   * Removes the listener <code>old</code> from the listener <code>lis</code>.
   *
   * @param lis The listener to remove <code>old</code> from.
   * @param old The listener to remove.
   *
   * @return The resulting listener after the remove operation.
   */
  public static MouseListener remove(MouseListener l, MouseListener oldl) 
  {
    return (MouseListener) removeInternal(l, oldl);
  }

  /**
   * Removes the listener <code>old</code> from the listener <code>lis</code>.
   *
   * @param lis The listener to remove <code>old</code> from.
   * @param old The listener to remove.
   *
   * @return The resulting listener after the remove operation.
   */
  public static MouseMotionListener remove(MouseMotionListener l, 
					   MouseMotionListener oldl) 
  {
    return (MouseMotionListener) removeInternal(l, oldl);
  }

  /**
   * Removes the listener <code>old</code> from the listener <code>lis</code>.
   *
   * @param lis The listener to remove <code>old</code> from.
   * @param old The listener to remove.
   *
   * @return The resulting listener after the remove operation.
   */
  public static TextListener remove(TextListener l, TextListener oldl)                                            
  {
    return (TextListener) removeInternal(l, oldl);
  }

  /**
   * Removes the listener <code>old</code> from the listener <code>lis</code>.
   *
   * @param lis The listener to remove <code>old</code> from.
   * @param old The listener to remove.
   *
   * @return The resulting listener after the remove operation.
   */
  public static WindowListener remove(WindowListener l, WindowListener oldl) 
  {
    return (WindowListener) removeInternal(l, oldl);
  }

  /**
   * Handles this event by dispatching it to the "a" and "b" listener
   * instances.
   *
   * @param event The event to handle.
   */
  public void actionPerformed(ActionEvent e) 
  {
    ((ActionListener) a).actionPerformed(e);
    ((ActionListener) b).actionPerformed(e);
  }

  /**
   * Handles this event by dispatching it to the "a" and "b" listener
   * instances.
   *
   * @param event The event to handle.
   */
  public void adjustmentValueChanged(AdjustmentEvent e) 
  {
    ((AdjustmentListener) a).adjustmentValueChanged(e);
    ((AdjustmentListener) b).adjustmentValueChanged(e);
  }

  /**
   * Handles this event by dispatching it to the "a" and "b" listener
   * instances.
   *
   * @param event The event to handle.
   */
  public void componentHidden(ComponentEvent e)
  {
    ((ComponentListener) a).componentHidden(e);
    ((ComponentListener) b).componentHidden(e);
  }

  /**
   * Handles this event by dispatching it to the "a" and "b" listener
   * instances.
   *
   * @param event The event to handle.
   */
  public void componentMoved(ComponentEvent e)
  {
    ((ComponentListener) a).componentMoved(e);
    ((ComponentListener) b).componentMoved(e);
  }

  /**
   * Handles this event by dispatching it to the "a" and "b" listener
   * instances.
   *
   * @param event The event to handle.
   */
  public void componentResized(ComponentEvent e)
  {
    ((ComponentListener) a).componentResized(e);
    ((ComponentListener) b).componentResized(e);
  }

  /**
   * Handles this event by dispatching it to the "a" and "b" listener
   * instances.
   *
   * @param event The event to handle.
   */
  public void componentShown(ComponentEvent e)
  {
    ((ComponentListener) a).componentShown(e);
    ((ComponentListener) b).componentShown(e);
  }

  /**
   * Handles this event by dispatching it to the "a" and "b" listener
   * instances.
   *
   * @param event The event to handle.
   */
  public void componentAdded(ContainerEvent e)
  {
    ((ContainerListener) a).componentAdded(e);
    ((ContainerListener) b).componentAdded(e);
  }

  /**
   * Handles this event by dispatching it to the "a" and "b" listener
   * instances.
   *
   * @param event The event to handle.
   */
  public void componentRemoved(ContainerEvent e)
  {
    ((ContainerListener) a).componentRemoved(e);
    ((ContainerListener) b).componentRemoved(e);
  }

  /**
   * Handles this event by dispatching it to the "a" and "b" listener
   * instances.
   *
   * @param event The event to handle.
   */
  public void focusGained(FocusEvent e)
  {
    ((FocusListener) a).focusGained(e);
    ((FocusListener) b).focusGained(e);
  }

  /**
   * Handles this event by dispatching it to the "a" and "b" listener
   * instances.
   *
   * @param event The event to handle.
   */
  public void focusLost(FocusEvent e) 
  {
    ((FocusListener) a).focusLost(e);
    ((FocusListener) b).focusLost(e);
  }

  /**
   * Handles this event by dispatching it to the "a" and "b" listener
   * instances.
   *
   * @param event The event to handle.
   */
  public void ancestorMoved(HierarchyEvent e) 
  {
    ((HierarchyBoundsListener) a).ancestorMoved(e);
    ((HierarchyBoundsListener) b).ancestorMoved(e);
  }

  /**
   * Handles this event by dispatching it to the "a" and "b" listener
   * instances.
   *
   * @param event The event to handle.
   */
  public void ancestorResized(HierarchyEvent e) 
  {
    ((HierarchyBoundsListener) a).ancestorResized(e);
    ((HierarchyBoundsListener) b).ancestorResized(e);
  }

  /**
   * Handles this event by dispatching it to the "a" and "b" listener
   * instances.
   *
   * @param event The event to handle.
   */
  public void hierarchyChanged(HierarchyEvent e) 
  {
    ((HierarchyListener) a).hierarchyChanged(e);
    ((HierarchyListener) b).hierarchyChanged(e);
  }

  /**
   * Handles this event by dispatching it to the "a" and "b" listener
   * instances.
   *
   * @param event The event to handle.
   */
  public void caretPositionChanged(InputMethodEvent e)
  {
    ((InputMethodListener) a).caretPositionChanged(e);
    ((InputMethodListener) b).caretPositionChanged(e);
  }

  /**
   * Handles this event by dispatching it to the "a" and "b" listener
   * instances.
   *
   * @param event The event to handle.
   */
  public void inputMethodTextChanged(InputMethodEvent e) 
  {
    ((InputMethodListener) a).inputMethodTextChanged(e);
    ((InputMethodListener) b).inputMethodTextChanged(e);
  }

  /**
   * Handles this event by dispatching it to the "a" and "b" listener
   * instances.
   *
   * @param event The event to handle.
   */
  public void itemStateChanged(ItemEvent e) 
  {
    ((ItemListener) a).itemStateChanged(e);
    ((ItemListener) b).itemStateChanged(e);
  }  

  /**
   * Handles this event by dispatching it to the "a" and "b" listener
   * instances.
   *
   * @param event The event to handle.
   */
  public void keyPressed(KeyEvent e)
  {
    ((KeyListener) a).keyPressed(e);
    ((KeyListener) b).keyPressed(e);
  }

  /**
   * Handles this event by dispatching it to the "a" and "b" listener
   * instances.
   *
   * @param event The event to handle.
   */
  public void keyReleased(KeyEvent e) 
  {
    ((KeyListener) a).keyReleased(e);
    ((KeyListener) b).keyReleased(e);
  }

  /**
   * Handles this event by dispatching it to the "a" and "b" listener
   * instances.
   *
   * @param event The event to handle.
   */
  public void keyTyped(KeyEvent e) 
  {
    ((KeyListener) a).keyTyped(e);
    ((KeyListener) b).keyTyped(e);
  }

  /**
   * Handles this event by dispatching it to the "a" and "b" listener
   * instances.
   *
   * @param event The event to handle.
   */
  public void mouseClicked(MouseEvent e) 
  {
    ((MouseListener) a).mouseClicked(e);
    ((MouseListener) b).mouseClicked(e);
  }

  /**
   * Handles this event by dispatching it to the "a" and "b" listener
   * instances.
   *
   * @param event The event to handle.
   */
  public void mouseEntered(MouseEvent e) 
  {
    ((MouseListener) a).mouseEntered(e);
    ((MouseListener) b).mouseEntered(e);
  }

  /**
   * Handles this event by dispatching it to the "a" and "b" listener
   * instances.
   *
   * @param event The event to handle.
   */
  public void mouseExited(MouseEvent e) 
  {
    ((MouseListener) a).mouseExited(e);
    ((MouseListener) b).mouseExited(e);
  }

  /**
   * Handles this event by dispatching it to the "a" and "b" listener
   * instances.
   *
   * @param event The event to handle.
   */
  public void mousePressed(MouseEvent e) 
  {
    ((MouseListener) a).mousePressed(e);
    ((MouseListener) b).mousePressed(e);
  }

  /**
   * Handles this event by dispatching it to the "a" and "b" listener
   * instances.
   *
   * @param event The event to handle.
   */
  public void mouseReleased(MouseEvent e) 
  {
    ((MouseListener) a).mouseReleased(e);
    ((MouseListener) b).mouseReleased(e);
  }

  /**
   * Handles this event by dispatching it to the "a" and "b" listener
   * instances.
   *
   * @param event The event to handle.
   */
  public void mouseDragged(MouseEvent e) 
  {
    ((MouseMotionListener) a).mouseDragged(e);
    ((MouseMotionListener) b).mouseDragged(e);
  }

  /**
   * Handles this event by dispatching it to the "a" and "b" listener
   * instances.
   *
   * @param event The event to handle.
   */
  public void mouseMoved(MouseEvent e) 
  {
    ((MouseMotionListener) a).mouseMoved(e);
    ((MouseMotionListener) b).mouseMoved(e);
  }

  /**
   * Handles this event by dispatching it to the "a" and "b" listener
   * instances.
   *
   * @param event The event to handle.
   */
  public void textValueChanged(TextEvent e) 
  {
    ((TextListener) a).textValueChanged(e);
    ((TextListener) b).textValueChanged(e);
  }

  /**
   * Handles this event by dispatching it to the "a" and "b" listener
   * instances.
   *
   * @param event The event to handle.
   */
  public void windowActivated(WindowEvent e) 
  {
    ((WindowListener) a).windowActivated(e);
    ((WindowListener) b).windowActivated(e);
  }

  /**
   * Handles this event by dispatching it to the "a" and "b" listener
   * instances.
   *
   * @param event The event to handle.
   */
  public void windowClosed(WindowEvent e) 
  {
    ((WindowListener) a).windowClosed(e);
    ((WindowListener) b).windowClosed(e);
  }

  /**
   * Handles this event by dispatching it to the "a" and "b" listener
   * instances.
   *
   * @param event The event to handle.
   */
  public void windowClosing(WindowEvent e) 
  {
    ((WindowListener) a).windowClosing(e);
    ((WindowListener) b).windowClosing(e);
  }

  /**
   * Handles this event by dispatching it to the "a" and "b" listener
   * instances.
   *
   * @param event The event to handle.
   */
  public void windowDeactivated(WindowEvent e) 
  {
    ((WindowListener) a).windowDeactivated(e);
    ((WindowListener) b).windowDeactivated(e);
  }

  /**
   * Handles this event by dispatching it to the "a" and "b" listener
   * instances.
   *
   * @param event The event to handle.
   */
  public void windowDeiconified(WindowEvent e) 
  {
    ((WindowListener) a).windowDeiconified(e);
    ((WindowListener) b).windowDeiconified(e);
  }

  /**
   * Handles this event by dispatching it to the "a" and "b" listener
   * instances.
   *
   * @param event The event to handle.
   */
  public void windowIconified(WindowEvent e) 
  {
    ((WindowListener) a).windowIconified(e);
    ((WindowListener) b).windowIconified(e);
  }

  /**
   * Handles this event by dispatching it to the "a" and "b" listener
   * instances.
   *
   * @param event The event to handle.
   */
  public void windowOpened(WindowEvent e) 
  {
    ((WindowListener) a).windowOpened(e);
    ((WindowListener) b).windowOpened(e);
  }

  protected static void save(ObjectOutputStream s, String k, EventListener l) 
  {
    throw new RuntimeException("Not Implemented");
  }

  protected void saveInternal(ObjectOutputStream s, String k)
  {
    throw new RuntimeException("Not Implemented");
  }
}