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.
Warning:
Serialized objects of this class will not be compatible with
future Swing releases. The current serialization support is
appropriate for short term storage or RMI between applications running
the same version of Swing. As of 1.4, support for long term storage
of all JavaBeansTM
has been added to the java.beans
package.
Please see XMLEncoder
.
Modifier and Type | Field and Description |
---|---|
protected java.lang.Object[] |
listenerList |
private static java.lang.Object[] |
NULL_ARRAY |
Constructor and Description |
---|
EventListenerList() |
Modifier and Type | Method and Description |
---|---|
<T extends java.util.EventListener> |
add(java.lang.Class<T> t,
T 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.
|
private int |
getListenerCount(java.lang.Object[] list,
java.lang.Class t) |
java.lang.Object[] |
getListenerList()
Passes back the event listener list as an array
of ListenerType-listener pairs.
|
<T extends java.util.EventListener> |
getListeners(java.lang.Class<T> t)
Return an array of all the listeners of the given type.
|
private void |
readObject(java.io.ObjectInputStream s) |
<T extends java.util.EventListener> |
remove(java.lang.Class<T> t,
T l)
Removes the listener as a listener of the specified type.
|
java.lang.String |
toString()
Returns a string representation of the EventListenerList.
|
private void |
writeObject(java.io.ObjectOutputStream s) |
private static final java.lang.Object[] NULL_ARRAY
protected transient java.lang.Object[] listenerList
public java.lang.Object[] getListenerList()
public <T extends java.util.EventListener> T[] getListeners(java.lang.Class<T> t)
java.lang.ClassCastException
- if the supplied class
is not assignable to EventListenerpublic int getListenerCount()
public int getListenerCount(java.lang.Class<?> t)
private int getListenerCount(java.lang.Object[] list, java.lang.Class t)
public <T extends java.util.EventListener> void add(java.lang.Class<T> t, T l)
t
- the type of the listener to be addedl
- the listener to be addedpublic <T extends java.util.EventListener> void remove(java.lang.Class<T> t, T l)
t
- the type of the listener to be removedl
- the listener to be removedprivate void writeObject(java.io.ObjectOutputStream s) throws java.io.IOException
java.io.IOException
private void readObject(java.io.ObjectInputStream s) throws java.io.IOException, java.lang.ClassNotFoundException
java.io.IOException
java.lang.ClassNotFoundException
public java.lang.String toString()
toString
in class java.lang.Object
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