The even i want to handle is from the top most Class. but
this.addListener("reload") wont work , and i cant reload the table by
passing values from this container.
so i had to listen from TableToolBar , at the topmost container and do
stuff there.
I am doing that way all the time and Frustrate by the number of hierarchy
it have to go through , making code really long.
On Mon, Feb 13, 2012 at 11:56 PM, thron7 <[email protected]>wrote:
> Ah, sorry, a colleague just informs me that it might be not so simple
> for the event bubbling as I put it. Not all widgets seem to be able to
> handle events even when you attach listeners to them. So take what I've
> written with care. Maybe you want to read up on event handling in the
> manual [1].
>
> T.
>
> [1] http://manual.qooxdoo.org/1.6.x/pages/gui_toolkit/ui_interaction.html
>
> On 02/13/2012 06:17 PM, thron7 wrote:
> >
> > 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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