RE: [flexcoders] Re: Best way to reference items in a parent MXML component?

Sun, 13 Aug 2006 06:04:58 -0700

I was wondering about this after I sent my reply ... What if you need a return value?

 

I think there are basically 3 ways to go:

  • The ‘circular dependency’ way: define an instance of your (custom) view stack in your child, with a setter. After you loaded the child into the view stack, also call the setter method with the ViewStack in it: easiest solution, but if it’s nice ...
  • The ‘interface’ way: define an interface where you put the methods that you need in your children. Let the ViewStack implement this interface. Define an instance of this interface in your child, with a setter. Call the setter with the ViewStack as argument later.
  • Use a ‘utility’ action script. This might be the best solution for what you mention below: formatting dates. Probably you will want to have your dates formatted the same way throughout your application; formatting is most likely also a ‘stateless’ operation, at least not something ViewStack specific, so you could perfectly place it behind some ‘static’ operation.

 

I am using the ‘event’ way quite a lot myself, and I’m happy with it. But, indeed, you can only use it for ‘notification’ cases only; where you need a return value, this would not apply.

 

HTH,
Franck

 

From: [email protected] [mailto:[email protected]] On Behalf Of ben.clinkinbeard
Sent: Sunday, August 13, 2006 12:12 AM
To: [email protected]
Subject: [flexcoders] Re: Best way to reference items in a parent MXML component?

 

How would a child call a function in the parent though? Events don't
seem (semantically) like the right thing because I basically just want
to use a utility function defined in the parent. Like I have a
function that I am using to format the dataTips of my charts in the
child components, but dispatching an event every time I roll over a
chart item seems a bit tedious and extreme.

Is there a better way or do I just need to get used to using events? I
come from a Flash background and have not used events very much.

Thanks,
Ben

--- In [EMAIL PROTECTED]ups.com, "Sergey Kovalyov"
<skovalyov.flexcode[EMAIL PROTECTED]> wrote:
>
> Events must be used here. Your child elements should dispatch custom
> events and container that holds them should listen to that events.
> Event listener will handle the child via target property of event
> object.
>
> On 8/12/06, ben.clinkinbeard <ben.clinkinbeard@...> wrote:
> > I have a ViewStack whose child elements each contain a graph. I would
> > like to define some things in the file that holds the ViewStack so
> > that all of the child charts can use them, but am not sure of the best
> > way to reference and call these things. Ideally I would like to
> > somehow pass in a reference to the containing object so that I don't
> > have to pass several items into each child, but have yet to figure out
> > a way to do that. I know there has to be a better way than what I have
> > now:
>

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