On 02/13/2012 05:53 PM, Phyo Arkar wrote:
> I want to listen the event that fire event from innermost class .
>
> What i do currently is i listen by doing this:
>
> from TableToolBar:
>
> this.fireEvent("reload",handler)
>
> from top class:
>
> this.DashBoard.RightComp.TableComp.TableToolBar.addListener(...)
>
>
> Is there anyway to listen even from top class directly , without
> needing to drill down hierarchically ?
Two things:
a) qooxdoo events "bubble". Ie. the event will not only be delivered to
the event target (the widget that should "have" the event), but all
enclosing widgets (where you called the .add method on), up to the root
widget, will be delivered this event (unless you "stop" the event in one
of those widgets, that is). So you can register a "reload" listener e.g.
on your top-most container widget, and it will eventually see the same
event.
b) On the other hand, you want to make sure that you add listeners for
such an event only to widgets that are really interested in it, and can
do something sensible with it. So if your TableToolBar needs to handle
this event, there is no way around attaching a listener to TableToolBar,
as you did in your example. This is independent of *how* you achieve
that, either by adding the listener in the TableToolBar constructor,
adding it in the code that instantiates objects of this class, or over
some nested object references like you did.
So you know that the event will bubble up the widget hierarchy, and you
need to attach the listener at those widgets that really want to deal
with it.
T.
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