On Apr 17, 2011, at 11:22 PM, Nick Raptis wrote:
> To my understanding, when you call raiseEvent from somewhere, you just
> release it to the wild for any listening handlers to act on it.
> Well, not exactly, as http://wiki.dabodev.com/Events suggests that an
> event propagates only to the children of the object that raised them.
Events don't really 'propagate'; instead, they are sent to the objects
to which they are bound. It's more of a publish/subscribe model rather than a
broadcast model.
> But I'm stuck for some hours now, and I can't seem to be able to listen
> for an event, except when I'm raising it from the same object that listens.
> None of the children of the raising object get the event.
I believe that is by design (perhaps Paul can chime in). Event bindings
are registered with the object that raises the event; you change the handler
function if you want a different object to handle the event. In your example,
anything that wants to respond to txt1's custom event would have to run the
equivalent of:
txt1.bindEvent(MyCustomEvent, self.mySpecificHandler)
So if you wanted to have the form respond to the event, you have two
options:
1) Have the form register with the textbox:
self.txt1.bindEvent(MyCustomEvent, self.onMyCustomEvent)
2) Have the textbox's Hit event raise the event in the form, and then bind to
that:
self.bindEvent(MyCustomEvent, self.onMyCustomEvent)
The way I keep things straight is that "bindEvent" registers the
handler function with the object that bindEvent is called on; if that object
later receives a raiseEvent() for that particular event, it simply calls the
bound handler. There is no generic way to listen to one class of events no
matter which object raises them.
-- Ed Leafe
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