T - the value about to be changedpublic class ValueChangeEvent<T> extends GwtEvent<ValueChangeHandler<T>>
GwtEvent.Type<H>| Modifier | Constructor and Description |
|---|---|
protected |
ValueChangeEvent(T value)
Creates a value change event.
|
| Modifier and Type | Method and Description |
|---|---|
protected void |
dispatch(ValueChangeHandler<T> handler)
Should only be called by
HandlerManager. |
static <T> void |
fire(HasValueChangeHandlers<T> source,
T value)
Fires a value change event on all registered handlers in the handler
manager.
|
static <T> void |
fireIfNotEqual(HasValueChangeHandlers<T> source,
T oldValue,
T newValue)
Fires value change event if the old value is not equal to the new value.
|
GwtEvent.Type<ValueChangeHandler<T>> |
getAssociatedType()
Returns the
Event.Type used to register this event, allowing an
EventBus to find handlers of the appropriate class. |
static GwtEvent.Type<ValueChangeHandler<?>> |
getType()
Gets the type associated with this event.
|
T |
getValue()
Gets the value.
|
protected static <T> boolean |
shouldFire(HasValueChangeHandlers<T> source,
T oldValue,
T newValue)
Convenience method to allow subtypes to know when they should fire a value
change event in a null-safe manner.
|
java.lang.String |
toDebugString()
This is a method used primarily for debugging.
|
protected ValueChangeEvent(T value)
value - the valuepublic static <T> void fire(HasValueChangeHandlers<T> source, T value)
T - the old value typesource - the source of the handlersvalue - the valuepublic static <T> void fireIfNotEqual(HasValueChangeHandlers<T> source, T oldValue, T newValue)
T - the old value typesource - the source of the handlersoldValue - the oldValue, may be nullnewValue - the newValue, may be nullpublic static GwtEvent.Type<ValueChangeHandler<?>> getType()
protected static <T> boolean shouldFire(HasValueChangeHandlers<T> source, T oldValue, T newValue)
T - value typesource - the sourceoldValue - the old valuenewValue - the new valuepublic final GwtEvent.Type<ValueChangeHandler<T>> getAssociatedType()
EventEvent.Type used to register this event, allowing an
EventBus to find handlers of the appropriate class.getAssociatedType in class GwtEvent<ValueChangeHandler<T>>public T getValue()
public java.lang.String toDebugString()
EventtoDebugString in class Event<ValueChangeHandler<T>>protected void dispatch(ValueChangeHandler<T> handler)
GwtEventHandlerManager. In other words, do not use
or call.dispatch in class GwtEvent<ValueChangeHandler<T>>handler - handlerEventBus.dispatchEvent(Event, Object)