Another thing to note:
Delegating the event as such:
_dg.addEventListener("change", Delegate.create(this,
datagridChangeHandler));
will NOT allow you to remove the event listener.
This won't work:
_dg.removeEventListener("change", Delegate.create(this,
datagridChangeHandler));
What I usually do is have a private variable:
private var datagridChangeHandler_func
and then create the delegate:
datagridChangeHandler_func = Delegate.create(this, datagridChangeHandler);
Thany you would add and remove it as:
_dg.addEventListener("change", datagridChangeHandler_func);
_dg.removeEventListener("change", datagridChangeHandler_func);
- James
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Muzak
Sent: Thursday, June 07, 2007 12:22 PM
To: [email protected]
Subject: Re: [Flashcoders] EventDispatcher weirdness in AS2
Even though it's possible to use the class instance as the listener (this),
you're still better off using Delegate.
What if you have 2 instances dispatching the same event that need to be
handled completely different?
submit_btn.addEventListener("click", this);
aTotallyUnrelated_btn.addEventListener("click", this);
The above will work, but they'll both trigger the same event handler and
you'll have to resort to if()else() stuff.
No big deal if you have 2 buttons.. get's hairy with loads of buttons.
Or what about different components (DataGrid, ComboBox, List, etc..) who all
dispatch a "change" event..
_dg.addEventListener("change", this);
_cb.addEventListener("change", this);
_list.addEventListener("change", this);
versus:
_dg.addEventListener("change", Delegate.create(this,
datagridChangeHandler));
_cb.addEventListener("change", Delegate.create(this, comboChangeHandler));
_list.addEventListener("change", Delegate.create(this, listChangeHandler));
Get in the habit of using Delegate (in AS2) and *always* use it.. no
exceptions ;-)
regards,
Muzak
----- Original Message -----
From: "Alain Rousseau" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Thursday, June 07, 2007 4:07 PM
Subject: RE: [Flashcoders] EventDispatcher weirdness in AS2
> Hehe no prob.
>
> For your listener are you doing something like
>
> _myClass.addEventListener("onTransition", Delegeate.create(this,
> onTransitionHandler));
>
> private function onTransitionHandler() {
> //do stuff
> }
>
> don't you prefer
>
> _myClass.addEventListener("onTransition", this);
>
> function onTransition() {
> //do stuff
> }
>
> for better clarity and less code writing ? No need of delegate in this
case.
>
> Of course it's a question of choice and habit. Just to let you know of the
> alternatives !
>
> Alain
>
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