On Aug 20, 2:33 am, jscheller <[email protected]> wrote:
> Hello -
>
> So, I've got a composite that has something like this inside it...
>
> private HandlerManager changeHandlers = new HandlerManager( null );
>
> public HandlerRegistration addValueChangeHandler(ValueChangeHandler
> handler)
> { return changeHandlers.addHandler(ValueChangeEvent.getType(),
> handler); }
You shouldn't ever instantiate a HandlerManager (except if you use one
as an "event bus"; but that's another story and at least this rule is
true for widgets); just call the Widget#addHandler(...) method.
public HandlerRegistration addValueChangeHandler
(ValueChangeHandler<String> handler) {
return addHandler(handler, ValueChangeEvent.getType());
}
> ...and somewhere down the pipeline, I want to actually fire off an
> event to anyone who registered a handler when the composite decides
> it's represented value has changed and wants the rest of the world to
> know. However, the syntax for actually constructing and firing the
> event off has got me pulling my hair out.
>
> I've tried variants of sending the event through the change
> handlers...
>
> changeHandlers.fireEvent( new ValueChangeEvent("foo") );
> changeHandlers.fireEvent( new ValueChangeEvent<String>("foo") );
>
> ...and using the static fire() method in the event class itself...
>
> ValueChangeEvent<String>.fire( changeHandlers, "foo");
>
> ...and Eclipse complains loudly about all of these constructions. I
> mean, I know this can't be that hard, but I can't find any good
> examples of things like this using the new (GWT 1.6 or later) event
> handlers, and reading the code sends me down a DOM event/Java generics
> rabbit hole that I'm frankly not experienced enough to deal with
> yet...
>
> Any help appreciated!
ValueChangeEvent.fire(this, "foo");
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