com.google.gwt.user.client.ui
Class DelegatingChangeListenerCollection
java.lang.Object
java.util.AbstractCollection
java.util.AbstractList
java.util.ArrayList
com.google.gwt.user.client.ui.ChangeListenerCollection
com.google.gwt.user.client.ui.DelegatingChangeListenerCollection
- All Implemented Interfaces:
- ChangeListener, java.lang.Cloneable, java.util.Collection, java.util.EventListener, java.util.List, java.util.RandomAccess, java.io.Serializable
- 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
Fields inherited from class java.util.AbstractList |
modCount |
Method Summary |
void |
onChange(Widget sender)
Fired when a widget changes, where 'change' is defined by the widget
sending the event. |
Methods inherited from class java.util.ArrayList |
add, add, addAll, addAll, clear, clone, contains, ensureCapacity, get, indexOf, isEmpty, lastIndexOf, remove, removeRange, set, size, toArray, toArray, trimToSize |
Methods inherited from class java.util.AbstractList |
equals, hashCode, iterator, listIterator, listIterator, subList |
Methods inherited from class java.util.AbstractCollection |
containsAll, remove, removeAll, retainAll, toString |
Methods inherited from class java.lang.Object |
finalize, getClass, notify, notifyAll, wait, wait, wait |
Methods inherited from interface java.util.List |
containsAll, equals, hashCode, iterator, listIterator, listIterator, remove, removeAll, retainAll, subList |
DelegatingChangeListenerCollection
public DelegatingChangeListenerCollection(Widget owner,
SourcesChangeEvents delegatedTo)
- Constructor for
DelegatingChangeListenerCollection
.
- Parameters:
owner
- owner of listenersdelegatedTo
- source of events
onChange
public void onChange(Widget sender)
- 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.