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java.lang.Objectcom.google.gwt.event.shared.EventBus
com.google.gwt.event.shared.SimpleEventBus
public class SimpleEventBus
Basic implementation of EventBus
.
Constructor Summary | |
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SimpleEventBus()
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Method Summary | ||
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addHandler(GwtEvent.Type<H> type,
H handler)
Adds an unfiltered handler to receive events of this type from all sources. |
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addHandlerToSource(GwtEvent.Type<H> type,
java.lang.Object source,
H handler)
Adds a handler to receive events of this type from the given source. |
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void |
fireEvent(GwtEvent<?> event)
Fires the event from no source. |
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void |
fireEventFromSource(GwtEvent<?> event,
java.lang.Object source)
Fires the given event to the handlers listening to the event's type. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public SimpleEventBus()
Method Detail |
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public <H extends EventHandler> HandlerRegistration addHandler(GwtEvent.Type<H> type, H handler)
EventBus
It is rare to call this method directly. More typically a GwtEvent
subclass will provide a static register
method, or a widget
will accept handlers directly.
A tip: to make a handler de-register itself, the following works:
new MyHandler() {
HandlerRegistration reg = MyEvent.register(eventBus, this);
public void onMyThing(MyEvent event) {
/* do your thing */
reg.removeHandler();
}
};
addHandler
in class EventBus
H
- The type of handlertype
- the event type associated with this handlerhandler
- the handler
public <H extends EventHandler> HandlerRegistration addHandlerToSource(GwtEvent.Type<H> type, java.lang.Object source, H handler)
EventBus
It is rare to call this method directly. More typically a GwtEvent
subclass will provide a static register
method, or a widget
will accept handlers directly.
addHandlerToSource
in class EventBus
H
- The type of handlertype
- the event type associated with this handlersource
- the source associated with this handlerhandler
- the handler
public void fireEvent(GwtEvent<?> event)
EventBus
fireEvent
in interface HasHandlers
fireEvent
in class EventBus
event
- the event to firepublic void fireEventFromSource(GwtEvent<?> event, java.lang.Object source)
EventBus
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.
fireEventFromSource
in class EventBus
event
- the event to fire
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