com.google.gwt.user.client.ui
Class DelegatingChangeListenerCollection

java.lang.Object
  java.util.AbstractCollection<E>
      java.util.AbstractList<E>
          java.util.ArrayList<ChangeListener>
              com.google.gwt.user.client.ui.ChangeListenerCollection
                  com.google.gwt.user.client.ui.DelegatingChangeListenerCollection

All Implemented Interfaces:

ChangeListener, java.io.Serializable, java.lang.Cloneable, java.lang.Iterable<ChangeListener>, java.util.Collection<ChangeListener>, java.util.EventListener, java.util.List<ChangeListener>, java.util.RandomAccess

@Deprecated
public class DelegatingChangeListenerCollection
extends ChangeListenerCollection
implements ChangeListener

ChangeListenerCollection used to correctly hook up listeners which need to listen to events from another source.

For example, Composite widgets often need to listen to events generated on their wrapped widget. Upon the firing of a wrapped widget's event, the composite widget must fire its own listeners with itself as the source of the event. To use a DelegatingChangeListenerCollection, simply use the DelegatingChangeListenerCollection instead of a ChangeListenerCollection. For example, in SuggestBox, the following code is used to listen to change events on the SuggestBox's underlying widget.

  public void addChangeListener(ChangeListener listener) {
    if (changeListeners == null) {
      changeListeners = new DelegatingChangeListenerCollection(this, box);
    }
    changeListeners.add(listener);
  }

See Also:

Serialized Form

DelegatingChangeListenerCollection

public DelegatingChangeListenerCollection(Widget owner,
                                          SourcesChangeEvents delegatedTo)

Deprecated. 

Constructor for DelegatingChangeListenerCollection.

Parameters:

owner - owner of listeners

delegatedTo - source of events

onChange

public void onChange(Widget sender)

Deprecated. 

Description copied from interface: ChangeListener

Fired when a widget changes, where 'change' is defined by the widget sending the event.

Specified by:

onChange in interface ChangeListener

Parameters:

sender - the widget that has changed