public class EventListenerList
extends java.lang.Object
implements java.io.Serializable
EventListenerList listenerList = new EventListenerList(); FooEvent fooEvent = null; public void addFooListener(FooListener l) { listenerList.add(FooListener.class, l); } public void removeFooListener(FooListener l) { listenerList.remove(FooListener.class, l); } // Notify all listeners that have registered interest for // notification on this event type. The event instance // is lazily created using the parameters passed into // the fire method. protected void fireFooXXX() { // Guaranteed to return a non-null array Object[] listeners = listenerList.getListenerList(); // Process the listeners last to first, notifying // those that are interested in this event for (int i = listeners.length-2; i>=0; i-=2) { if (listeners[i]==FooListener.class) { // Lazily create the event: if (fooEvent == null) fooEvent = new FooEvent(this); ((FooListener)listeners[i+1]).fooXXX(fooEvent); } } }foo should be changed to the appropriate name, and fireFooXxx to the appropriate method name. One fire method should exist for each notification method in the FooListener interface.
Modifier and Type | Field and Description |
---|---|
protected java.lang.Object[] |
listenerList |
Constructor and Description |
---|
EventListenerList() |
Modifier and Type | Method and Description |
---|---|
void |
add(java.lang.Class t,
java.util.EventListener l)
Adds the listener as a listener of the specified type.
|
int |
getListenerCount()
Returns the total number of listeners for this listener list.
|
int |
getListenerCount(java.lang.Class t)
Returns the total number of listeners of the supplied type
for this listener list.
|
java.lang.Object[] |
getListenerList()
Passes back the event listener list as an array
of ListenerType-listener pairs.
|
java.util.EventListener[] |
getListeners(java.lang.Class t)
Return an array of all the listeners of the given type.
|
void |
remove(java.lang.Class t,
java.util.EventListener l)
Removes the listener as a listener of the specified type.
|
java.lang.String |
toString()
Returns a string representation of the EventListenerList.
|
public java.lang.Object[] getListenerList()
public java.util.EventListener[] getListeners(java.lang.Class t)
java.lang.ClassCastException
- if the supplied class
is not assignable to EventListenerpublic int getListenerCount()
public int getListenerCount(java.lang.Class t)
public void add(java.lang.Class t, java.util.EventListener l)
t
- the type of the listener to be addedl
- the listener to be addedpublic void remove(java.lang.Class t, java.util.EventListener l)
t
- the type of the listener to be removedl
- the listener to be removedpublic java.lang.String toString()
toString
in class java.lang.Object