Hi, thanks for the explanations (this was not really what I was asking for,
but anyway... :)
Actually I understood what was going on. In the other case I was listening
to the "changeBubble" event, and it happens that this event gets fired by a
change in an array if the corresponding array property apply method fires
"_applyEventPropagation". This is because the first time this is fired, a
listener is registered on the array object which watches out for changes.
So basically, it was a matter of difference between "change" (which must
really be registered on the property) and "changeBubble". Things are clear
for me now. Again, thanks.
Jean-Noel
On Fri, Sep 11, 2009 at 12:49 PM, MartinWittemann <[email protected]
> wrote:
>
> Hello,
>
> ok, i'll give my best in explaining our thoughts.
>
> There are two events that can be fired by a data array.
>
> The first is named "changeLength" and will be fired every time the length
> of
> the array changes. But as you can imagine, thats not enough to get all
> changes like a reordering. The "changeLength" event is a plain event, so no
> data is attached.
>
> The second event is the "change" event which should be fired on every
> change
> of the array. This event is a data event and contains a map as data
> containing four parameters:
> * start
> * end
> * type (which is a string out of [add, remove, order])
> * items: an plain array containing the removed items for example (this one
> is extremely experimental!!!)
>
> But I guess what you are talking about is the mechanism of the bubbling
> events. The array supports the bubble events (at least it should) so it
> depends of your class if it uses the MEventBubbling mixin. But this usually
> only is interessting for the objects in the array and not the one above. So
> i don't know why its working in you other case but as far as i see, it
> should not work like you expected.
>
> Best,
> Martin
>
>
>
>
> Jean-Noël Rivasseau wrote:
> >
> > Hi, this is for Martin ;)
> >
> > Could you explain me exactly how the events triggered by qx.data.Array
> > work
> > exactly?
> >
> > I have a class that has a qx.data.Array property. I want to listen to all
> > the events that change the qx.data.Array contents in any way. The
> > following
> > will work:
> >
> > myObject.getMyProperty().addListener('change", callback);
> >
> > but I thought I could do a myObject.addListener("changeMyProperty");
> >
> > if of course the changeMyProperty event was defined for myProperty.
> > However,
> > this does not work in this case... and what is really bogging me is that
> I
> > have the *exact* similar case with another class, and for the other
> class,
> > this works (eg, the apply method is triggered every time the array
> changes
> > in any way...)
> >
> > So I am confused, what is the proper way of using all this?
> >
> > Jean-Noel
> >
> >
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