edu.rice.cs.plt.swing
Class ComposedListener<T>

java.lang.Object
  edu.rice.cs.plt.swing.ComposedListener<T>

Direct Known Subclasses:

ComposedActionListener, ComposedCaretListener, ComposedCellEditorListener, ComposedChangeListener, ComposedDocumentListener, ComposedTreeModelListener

public abstract class ComposedListener<T>
extends Object

Abstract parent of composed listeners, which allow a list to be treated as a single listener object. Subclasses should implement some listener interface and, for each method in that interface, traverse the result of #listeners and delegate. For example:

 public class ComposedFooListener extends ComposedListener implements FooListener {
   public void handleFooEvent1(FooEvent1 e) {
     for (FooListener l : listeners()) { l.handleFooEvent1(e); }
   }
   public void handleFooEvent2(FooEvent2 e) {
     for (FooListener l : listeners()) { l.handleFooEvent2(e); }
   }
 }
 

Following the convention of javax.swing.event.EventListenerList, the encapsulated list is treated like a stack: traversal always returns the last-added element first; removal will match the most recently-added listener equal to the provided listener.

Constructor Summary

ComposedListener()

Method Summary

void	add(T listener)
protected Iterable<T>	listeners()
void	remove(T listener)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ComposedListener

public ComposedListener()

Method Detail

add

public void add(T listener)

remove

public void remove(T listener)

listeners

protected Iterable<T> listeners()