Package com.google.gwt.event.shared

Class EventBus

java.lang.Object

com.google.web.bindery.event.shared.EventBus

com.google.gwt.event.shared.EventBus

All Implemented Interfaces:

HasHandlers

Direct Known Subclasses:

CountingEventBus, ResettableEventBus, SimpleEventBus

public abstract class EventBus
extends EventBus
implements HasHandlers

Extends {com.google.web.bindery.event.shared.EventBus} for legacy compatibility.

Constructor Summary

Constructors

Constructor	Description
EventBus()

Method Summary

Modifier and Type	Method	Description
abstract <H extends EventHandler> HandlerRegistration	addHandler(GwtEvent.Type<H> type, H handler)
<H> HandlerRegistration	addHandler(Event.Type<H> type, H handler)	Adds an unfiltered handler to receive events of this type from all sources.
abstract <H extends EventHandler> HandlerRegistration	addHandlerToSource(GwtEvent.Type<H> type, Object source, H handler)
<H> HandlerRegistration	addHandlerToSource(Event.Type<H> type, Object source, H handler)	Adds a handler to receive events of this type from the given source.
protected void	castFireEvent(GwtEvent<?> event)
protected void	castFireEventFromSource(GwtEvent<?> event, Object source)
abstract void	fireEvent(GwtEvent<?> event)	Fires the given event to the handlers listening to the event's type.
void	fireEvent(Event<?> event)	Fires the event from no source.
abstract void	fireEventFromSource(GwtEvent<?> event, Object source)
void	fireEventFromSource(Event<?> event, Object source)	Fires the given event to the handlers listening to the event's type.
protected HandlerRegistration	wrap(HandlerRegistration reg)

Methods inherited from class com.google.web.bindery.event.shared.EventBus

dispatchEvent, setSourceOfEvent

Methods inherited from class java.lang.Object

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

Constructor Details

EventBus

public EventBus()

Method Details

addHandler

public <H> HandlerRegistration addHandler(Event.Type<H> type,
 H handler)

Description copied from class: EventBus

Adds an unfiltered handler to receive events of this type from all sources.

It is rare to call this method directly. More typically an Event subclass will provide a static register method, or a widget will accept handlers directly.

Specified by:

addHandler in class EventBus

Type Parameters:

H - The type of handler

Parameters:

type - the event type associated with this handler

handler - the handler

Returns:

the handler registration, can be stored in order to remove the handler later

addHandler

public abstract <H extends EventHandler>
HandlerRegistration addHandler(GwtEvent.Type<H> type,
 H handler)

addHandlerToSource

public <H> HandlerRegistration addHandlerToSource(Event.Type<H> type,
 Object source,
 H handler)

Description copied from class: EventBus

Adds a handler to receive events of this type from the given source.

It is rare to call this method directly. More typically a Event subclass will provide a static register method, or a widget will accept handlers directly.

Specified by:

addHandlerToSource in class EventBus

Type Parameters:

H - The type of handler

Parameters:

type - the event type associated with this handler

source - the source associated with this handler

handler - the handler

Returns:

the handler registration, can be stored in order to remove the handler later

addHandlerToSource

public abstract <H extends EventHandler>
HandlerRegistration addHandlerToSource(GwtEvent.Type<H> type,
 Object source,
 H handler)

fireEvent

public void fireEvent(Event<?> event)

Description copied from class: EventBus

Fires the event from no source. Only unfiltered handlers will receive it.

Any exceptions thrown by handlers will be bundled into a UmbrellaException and then re-thrown after all handlers have completed. An exception thrown by a handler will not prevent other handlers from executing.

Specified by:

fireEvent in class EventBus

Parameters:

event - the event to fire

fireEvent

public abstract void fireEvent(GwtEvent<?> event)

Description copied from interface: HasHandlers

Fires the given event to the handlers listening to the event's type.

Any exceptions thrown by handlers will be bundled into a UmbrellaException and then re-thrown after all handlers have completed. An exception thrown by a handler will not prevent other handlers from executing.

Specified by:

fireEvent in interface HasHandlers

Parameters:

event - the event

fireEventFromSource

public void fireEventFromSource(Event<?> event,
 Object source)

Description copied from class: EventBus

Fires the given event to the handlers listening to the event's type.

Any exceptions thrown by handlers will be bundled into a UmbrellaException and then re-thrown after all handlers have completed. An exception thrown by a handler will not prevent other handlers from executing.

Specified by:

fireEventFromSource in class EventBus

Parameters:

event - the event to fire

fireEventFromSource

public abstract void fireEventFromSource(GwtEvent<?> event,
 Object source)

castFireEvent

protected void castFireEvent(GwtEvent<?> event)

castFireEventFromSource

protected void castFireEventFromSource(GwtEvent<?> event,
 Object source)

wrap

protected HandlerRegistration wrap(HandlerRegistration reg)