Class java.awt.AWTEventMulticaster - JDK 5 Documentation v1.1.8, Java 2 SDK 英文文档

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Class java.awt.AWTEventMulticaster

java.lang.Object
   |
   +----java.awt.AWTEventMulticaster

public class AWTEventMulticaster
extends Object
implements ComponentListener, ContainerListener, FocusListener, KeyListener, MouseListener, MouseMotionListener, WindowListener, ActionListener, ItemListener, AdjustmentListener, TextListener

A class which implements efficient and thread-safe multi-cast event dispatching for the AWT events defined in the java.awt.event package. This class will manage an immutable structure consisting of a chain of event listeners and will dispatch events to those listeners. Because the structure is immutable, it is safe to use this API to add/remove listeners during the process of an event dispatch operation. An example of how this class could be used to implement a new component which fires "action" events:


 public myComponent extends Component {
     ActionListener actionListener = null;
     public void addActionListener(ActionListener l) {
	   actionListener = AWTEventMulticaster.add(actionListener, l);
     }
     public void removeActionListener(ActionListener l) {
  	   actionListener = AWTEventMulticaster.remove(actionListener, l);
     }
     public void processEvent(AWTEvent e) {
         // when event occurs which causes "action" semantic
         if (actionListener != null) {
             actionListener.actionPerformed(new ActionEvent());
         }         
 }

a
b

AWTEventMulticaster(EventListener, EventListener): Creates an event multicaster instance which chains listener-a with listener-b.

actionPerformed(ActionEvent): Handles the actionPerformed event by invoking the actionPerformed methods on listener-a and listener-b.
add(ActionListener, ActionListener): Adds action-listener-a with action-listener-b and returns the resulting multicast listener.
add(AdjustmentListener, AdjustmentListener): Adds adjustment-listener-a with adjustment-listener-b and returns the resulting multicast listener.
add(ComponentListener, ComponentListener): Adds component-listener-a with component-listener-b and returns the resulting multicast listener.
add(ContainerListener, ContainerListener): Adds container-listener-a with container-listener-b and returns the resulting multicast listener.
add(FocusListener, FocusListener): Adds focus-listener-a with focus-listener-b and returns the resulting multicast listener.
add(ItemListener, ItemListener): Adds item-listener-a with item-listener-b and returns the resulting multicast listener.
add(KeyListener, KeyListener): Adds key-listener-a with key-listener-b and returns the resulting multicast listener.
add(MouseListener, MouseListener): Adds mouse-listener-a with mouse-listener-b and returns the resulting multicast listener.
add(MouseMotionListener, MouseMotionListener): Adds mouse-motion-listener-a with mouse-motion-listener-b and returns the resulting multicast listener.
add(TextListener, TextListener)
add(WindowListener, WindowListener): Adds window-listener-a with window-listener-b and returns the resulting multicast listener.
addInternal(EventListener, EventListener): Returns the resulting multicast listener from adding listener-a and listener-b together.
adjustmentValueChanged(AdjustmentEvent): Handles the adjustmentValueChanged event by invoking the adjustmentValueChanged methods on listener-a and listener-b.
componentAdded(ContainerEvent): Handles the componentAdded container event by invoking the componentAdded methods on listener-a and listener-b.
componentHidden(ComponentEvent): Handles the componentHidden event by invoking the componentHidden methods on listener-a and listener-b.
componentMoved(ComponentEvent): Handles the componentMoved event by invoking the componentMoved methods on listener-a and listener-b.
componentRemoved(ContainerEvent): Handles the componentRemoved container event by invoking the componentRemoved methods on listener-a and listener-b.
componentResized(ComponentEvent): Handles the componentResized event by invoking the componentResized methods on listener-a and listener-b.
componentShown(ComponentEvent): Handles the componentShown event by invoking the componentShown methods on listener-a and listener-b.
focusGained(FocusEvent): Handles the focusGained event by invoking the focusGained methods on listener-a and listener-b.
focusLost(FocusEvent): Handles the focusLost event by invoking the focusLost methods on listener-a and listener-b.
itemStateChanged(ItemEvent): Handles the itemStateChanged event by invoking the itemStateChanged methods on listener-a and listener-b.
keyPressed(KeyEvent): Handles the keyPressed event by invoking the keyPressed methods on listener-a and listener-b.
keyReleased(KeyEvent): Handles the keyReleased event by invoking the keyReleased methods on listener-a and listener-b.
keyTyped(KeyEvent): Handles the keyTyped event by invoking the keyTyped methods on listener-a and listener-b.
mouseClicked(MouseEvent): Handles the mouseClicked event by invoking the mouseClicked methods on listener-a and listener-b.
mouseDragged(MouseEvent): Handles the mouseDragged event by invoking the mouseDragged methods on listener-a and listener-b.
mouseEntered(MouseEvent): Handles the mouseEntered event by invoking the mouseEntered methods on listener-a and listener-b.
mouseExited(MouseEvent): Handles the mouseExited event by invoking the mouseExited methods on listener-a and listener-b.
mouseMoved(MouseEvent): Handles the mouseMoved event by invoking the mouseMoved methods on listener-a and listener-b.
mousePressed(MouseEvent): Handles the mousePressed event by invoking the mousePressed methods on listener-a and listener-b.
mouseReleased(MouseEvent): Handles the mouseReleased event by invoking the mouseReleased methods on listener-a and listener-b.
remove(ActionListener, ActionListener): Removes the old action-listener from action-listener-l and returns the resulting multicast listener.
remove(AdjustmentListener, AdjustmentListener): Removes the old adjustment-listener from adjustment-listener-l and returns the resulting multicast listener.
remove(ComponentListener, ComponentListener): Removes the old component-listener from component-listener-l and returns the resulting multicast listener.
remove(ContainerListener, ContainerListener): Removes the old container-listener from container-listener-l and returns the resulting multicast listener.
remove(EventListener): Removes a listener from this multicaster and returns the resulting multicast listener.
remove(FocusListener, FocusListener): Removes the old focus-listener from focus-listener-l and returns the resulting multicast listener.
remove(ItemListener, ItemListener): Removes the old item-listener from item-listener-l and returns the resulting multicast listener.
remove(KeyListener, KeyListener): Removes the old key-listener from key-listener-l and returns the resulting multicast listener.
remove(MouseListener, MouseListener): Removes the old mouse-listener from mouse-listener-l and returns the resulting multicast listener.
remove(MouseMotionListener, MouseMotionListener): Removes the old mouse-motion-listener from mouse-motion-listener-l and returns the resulting multicast listener.
remove(TextListener, TextListener)
remove(WindowListener, WindowListener): Removes the old window-listener from window-listener-l and returns the resulting multicast listener.
removeInternal(EventListener, EventListener): Returns the resulting multicast listener after removing the old listener from listener-l.
save(ObjectOutputStream, String, EventListener)
saveInternal(ObjectOutputStream, String)
textValueChanged(TextEvent)
windowActivated(WindowEvent): Handles the windowActivated event by invoking the windowActivated methods on listener-a and listener-b.
windowClosed(WindowEvent): Handles the windowClosed event by invoking the windowClosed methods on listener-a and listener-b.
windowClosing(WindowEvent): Handles the windowClosing event by invoking the windowClosing methods on listener-a and listener-b.
windowDeactivated(WindowEvent): Handles the windowDeactivated event by invoking the windowDeactivated methods on listener-a and listener-b.
windowDeiconified(WindowEvent): Handles the windowDeiconfied event by invoking the windowDeiconified methods on listener-a and listener-b.
windowIconified(WindowEvent): Handles the windowIconified event by invoking the windowIconified methods on listener-a and listener-b.
windowOpened(WindowEvent): Handles the windowOpened event by invoking the windowOpened methods on listener-a and listener-b.

 protected final EventListener a

 protected final EventListener b

AWTEventMulticaster

 protected AWTEventMulticaster(EventListener a,
                               EventListener b)

Creates an event multicaster instance which chains listener-a with listener-b.

Parameters:: a - listener-a; b - listener-b

remove

 protected EventListener remove(EventListener oldl)

Removes a listener from this multicaster and returns the resulting multicast listener.

Parameters:: oldl - the listener to be removed

componentResized

 public void componentResized(ComponentEvent e)

Handles the componentResized event by invoking the componentResized methods on listener-a and listener-b.

Parameters:: e - the component event

componentMoved

 public void componentMoved(ComponentEvent e)

Handles the componentMoved event by invoking the componentMoved methods on listener-a and listener-b.

Parameters:: e - the component event

componentShown

 public void componentShown(ComponentEvent e)

Handles the componentShown event by invoking the componentShown methods on listener-a and listener-b.

Parameters:: e - the component event

componentHidden

 public void componentHidden(ComponentEvent e)

Handles the componentHidden event by invoking the componentHidden methods on listener-a and listener-b.

Parameters:: e - the component event

componentAdded

 public void componentAdded(ContainerEvent e)

Handles the componentAdded container event by invoking the componentAdded methods on listener-a and listener-b.

Parameters:: e - the component event

componentRemoved

 public void componentRemoved(ContainerEvent e)

Handles the componentRemoved container event by invoking the componentRemoved methods on listener-a and listener-b.

Parameters:: e - the component event

focusGained

 public void focusGained(FocusEvent e)

Handles the focusGained event by invoking the focusGained methods on listener-a and listener-b.

Parameters:: e - the focus event

focusLost

 public void focusLost(FocusEvent e)

Handles the focusLost event by invoking the focusLost methods on listener-a and listener-b.

Parameters:: e - the focus event

keyTyped

 public void keyTyped(KeyEvent e)

Handles the keyTyped event by invoking the keyTyped methods on listener-a and listener-b.

Parameters:: e - the key event

keyPressed

 public void keyPressed(KeyEvent e)

Handles the keyPressed event by invoking the keyPressed methods on listener-a and listener-b.

Parameters:: e - the key event

keyReleased

 public void keyReleased(KeyEvent e)

Handles the keyReleased event by invoking the keyReleased methods on listener-a and listener-b.

Parameters:: e - the key event

mouseClicked

 public void mouseClicked(MouseEvent e)

Handles the mouseClicked event by invoking the mouseClicked methods on listener-a and listener-b.

Parameters:: e - the mouse event

mousePressed

 public void mousePressed(MouseEvent e)

Handles the mousePressed event by invoking the mousePressed methods on listener-a and listener-b.

Parameters:: e - the mouse event

mouseReleased

 public void mouseReleased(MouseEvent e)

Handles the mouseReleased event by invoking the mouseReleased methods on listener-a and listener-b.

Parameters:: e - the mouse event

mouseEntered

 public void mouseEntered(MouseEvent e)

Handles the mouseEntered event by invoking the mouseEntered methods on listener-a and listener-b.

Parameters:: e - the mouse event

mouseExited

 public void mouseExited(MouseEvent e)

Handles the mouseExited event by invoking the mouseExited methods on listener-a and listener-b.

Parameters:: e - the mouse event

mouseDragged

 public void mouseDragged(MouseEvent e)

Handles the mouseDragged event by invoking the mouseDragged methods on listener-a and listener-b.

Parameters:: e - the mouse event

mouseMoved

 public void mouseMoved(MouseEvent e)

Handles the mouseMoved event by invoking the mouseMoved methods on listener-a and listener-b.

Parameters:: e - the mouse event

windowOpened

 public void windowOpened(WindowEvent e)

Handles the windowOpened event by invoking the windowOpened methods on listener-a and listener-b.

Parameters:: e - the window event

windowClosing

 public void windowClosing(WindowEvent e)

Handles the windowClosing event by invoking the windowClosing methods on listener-a and listener-b.

Parameters:: e - the window event

windowClosed

 public void windowClosed(WindowEvent e)

Handles the windowClosed event by invoking the windowClosed methods on listener-a and listener-b.

Parameters:: e - the window event

windowIconified

 public void windowIconified(WindowEvent e)

Handles the windowIconified event by invoking the windowIconified methods on listener-a and listener-b.

Parameters:: e - the window event

windowDeiconified

 public void windowDeiconified(WindowEvent e)

Handles the windowDeiconfied event by invoking the windowDeiconified methods on listener-a and listener-b.

Parameters:: e - the window event

windowActivated

 public void windowActivated(WindowEvent e)

Handles the windowActivated event by invoking the windowActivated methods on listener-a and listener-b.

Parameters:: e - the window event

windowDeactivated

 public void windowDeactivated(WindowEvent e)

Handles the windowDeactivated event by invoking the windowDeactivated methods on listener-a and listener-b.

Parameters:: e - the window event

actionPerformed

 public void actionPerformed(ActionEvent e)

Handles the actionPerformed event by invoking the actionPerformed methods on listener-a and listener-b.

Parameters:: e - the action event

itemStateChanged

 public void itemStateChanged(ItemEvent e)

Handles the itemStateChanged event by invoking the itemStateChanged methods on listener-a and listener-b.

Parameters:: e - the item event

adjustmentValueChanged

 public void adjustmentValueChanged(AdjustmentEvent e)

Handles the adjustmentValueChanged event by invoking the adjustmentValueChanged methods on listener-a and listener-b.

Parameters:: e - the adjustment event

textValueChanged

 public void textValueChanged(TextEvent e)

add

 public static ComponentListener add(ComponentListener a,
                                     ComponentListener b)

Adds component-listener-a with component-listener-b and returns the resulting multicast listener.

Parameters:: a - component-listener-a; b - component-listener-b

add

 public static ContainerListener add(ContainerListener a,
                                     ContainerListener b)

Adds container-listener-a with container-listener-b and returns the resulting multicast listener.

Parameters:: a - container-listener-a; b - container-listener-b

add

 public static FocusListener add(FocusListener a,
                                 FocusListener b)

Adds focus-listener-a with focus-listener-b and returns the resulting multicast listener.

Parameters:: a - focus-listener-a; b - focus-listener-b

add

 public static KeyListener add(KeyListener a,
                               KeyListener b)

Adds key-listener-a with key-listener-b and returns the resulting multicast listener.

Parameters:: a - key-listener-a; b - key-listener-b

add

 public static MouseListener add(MouseListener a,
                                 MouseListener b)

Adds mouse-listener-a with mouse-listener-b and returns the resulting multicast listener.

Parameters:: a - mouse-listener-a; b - mouse-listener-b

add

 public static MouseMotionListener add(MouseMotionListener a,
                                       MouseMotionListener b)

Adds mouse-motion-listener-a with mouse-motion-listener-b and returns the resulting multicast listener.

Parameters:: a - mouse-motion-listener-a; b - mouse-motion-listener-b

add

 public static WindowListener add(WindowListener a,
                                  WindowListener b)

Adds window-listener-a with window-listener-b and returns the resulting multicast listener.

Parameters:: a - window-listener-a; b - window-listener-b

add

 public static ActionListener add(ActionListener a,
                                  ActionListener b)

Adds action-listener-a with action-listener-b and returns the resulting multicast listener.

Parameters:: a - action-listener-a; b - action-listener-b

add

 public static ItemListener add(ItemListener a,
                                ItemListener b)

Adds item-listener-a with item-listener-b and returns the resulting multicast listener.

Parameters:: a - item-listener-a; b - item-listener-b

add

 public static AdjustmentListener add(AdjustmentListener a,
                                      AdjustmentListener b)

Adds adjustment-listener-a with adjustment-listener-b and returns the resulting multicast listener.

Parameters:: a - adjustment-listener-a; b - adjustment-listener-b

add

 public static TextListener add(TextListener a,
                                TextListener b)

remove

 public static ComponentListener remove(ComponentListener l,
                                        ComponentListener oldl)

Removes the old component-listener from component-listener-l and returns the resulting multicast listener.

Parameters:: l - component-listener-l; oldl - the component-listener being removed

remove

 public static ContainerListener remove(ContainerListener l,
                                        ContainerListener oldl)

Removes the old container-listener from container-listener-l and returns the resulting multicast listener.

Parameters:: l - container-listener-l; oldl - the container-listener being removed

remove

 public static FocusListener remove(FocusListener l,
                                    FocusListener oldl)

Removes the old focus-listener from focus-listener-l and returns the resulting multicast listener.

Parameters:: l - focus-listener-l; oldl - the focus-listener being removed

remove

 public static KeyListener remove(KeyListener l,
                                  KeyListener oldl)

Removes the old key-listener from key-listener-l and returns the resulting multicast listener.

Parameters:: l - key-listener-l; oldl - the key-listener being removed

remove

 public static MouseListener remove(MouseListener l,
                                    MouseListener oldl)

Removes the old mouse-listener from mouse-listener-l and returns the resulting multicast listener.

Parameters:: l - mouse-listener-l; oldl - the mouse-listener being removed

remove

 public static MouseMotionListener remove(MouseMotionListener l,
                                          MouseMotionListener oldl)

Removes the old mouse-motion-listener from mouse-motion-listener-l and returns the resulting multicast listener.

Parameters:: l - mouse-motion-listener-l; oldl - the mouse-motion-listener being removed

remove

 public static WindowListener remove(WindowListener l,
                                     WindowListener oldl)

Removes the old window-listener from window-listener-l and returns the resulting multicast listener.

Parameters:: l - window-listener-l; oldl - the window-listener being removed

remove

 public static ActionListener remove(ActionListener l,
                                     ActionListener oldl)

Removes the old action-listener from action-listener-l and returns the resulting multicast listener.

Parameters:: l - action-listener-l; oldl - the action-listener being removed

remove

 public static ItemListener remove(ItemListener l,
                                   ItemListener oldl)

Removes the old item-listener from item-listener-l and returns the resulting multicast listener.

Parameters:: l - item-listener-l; oldl - the item-listener being removed

remove

 public static AdjustmentListener remove(AdjustmentListener l,
                                         AdjustmentListener oldl)

Removes the old adjustment-listener from adjustment-listener-l and returns the resulting multicast listener.

Parameters:: l - adjustment-listener-l; oldl - the adjustment-listener being removed

remove

 public static TextListener remove(TextListener l,
                                   TextListener oldl)

addInternal

 protected static EventListener addInternal(EventListener a,
                                            EventListener b)

Returns the resulting multicast listener from adding listener-a and listener-b together. If listener-a is null, it returns listener-b; If listener-b is null, it returns listener-a If neither are null, then it creates and returns a new AWTEventMulticaster instance which chains a with b.

Parameters:: a - event listener-a; b - event listener-b

removeInternal

 protected static EventListener removeInternal(EventListener l,
                                               EventListener oldl)

Returns the resulting multicast listener after removing the old listener from listener-l. If listener-l equals the old listener OR listener-l is null, returns null. Else if listener-l is an instance of AWTEventMulticaster, then it removes the old listener from it. Else, returns listener l.

Parameters:: l - the listener being removed from; oldl - the listener being removed

saveInternal

 protected void saveInternal(ObjectOutputStream s,
                             String k) throws IOException

save

 protected static void save(ObjectOutputStream s,
                            String k,
                            EventListener l) throws IOException

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