An often overlooked "feature" of MXML components (extending UIComponent) is that they have a data property that can be used for
pretty much anything.
// where MyClass is MXML
var instance:MyClass = new MyClass();
instance.data = {prop:"value"};
In MyClass you can either override the "data" getter/setter or listen for the
dataChange event and do what you need to do.
The data property is also bindable, so you can have mxml children inside
MyClass bind to it.
<mx:Label text="{data.prop}" />
One of the downsides of the data property is data typing (it's types as Object)
so you may have to do some type casting if needed.
regards,
Peter
----- Original Message -----
From: "mark goldin" <[email protected]>
To: "users" <[email protected]>
Sent: Friday, September 27, 2013 3:01 AM
Subject: Re: Send parameter to mxml constructor
That is not exactly what I have. Yes, I too have an mxml class based on
another AS class. But I am creating an instance of my mxml class like this:
var newMyClass:MyClass = new MyClass();
So, how can I pass a value for myProperty to newMyClass? My understanding
as soon as var newMyClass:MyClass = new MyClass(); executes all children on
newMyClass will be created but I need to have myProperty before that.
On Thu, Sep 26, 2013 at 7:17 PM, Mark Kessler
<[email protected]>wrote:
Let me make the example a little more neutral.
class being called.
public class MyClass inherits UIComponent
{
/**
* Constructor.
*/
public function MyClass ():void
{
super();
}
//----------------------------------------
// My setup property
//----------------------------------------
protected _myProperty:Object;
public function get myProperty():Object
{
return
}
public function set myProperty(value:Object):void
{
if (_myProperty == value)
{
return;
}
_myProperty = value;
setupChildren();
}
protected function setupChildren():void
{
//using the _myProperty to setup the children and marking
anything as being ready and available... events n such.
}
}
mxml side
<ns:MyClass myProperty="The property i'm passing to initialize" />
-Mark
On Thu, Sep 26, 2013 at 3:18 PM, mark goldin <[email protected]>
wrote:
> Are you saying I have to involve the DI framework?
>
>
> On Thu, Sep 26, 2013 at 2:13 PM, Kessler CTR Mark J <
> [email protected]> wrote:
>
> > Setter Dependency Injection(mxml compatible) vs constructor Dependency
> > Injection (AS compatible).
> >
> > -Mark
> >
> > -----Original Message-----
> > From: mark goldin [mailto:[email protected]]
> > Sent: Thursday, September 26, 2013 2:57 PM
> > To: users
> > Subject: Send parameter to mxml constructor
> >
> > I have an mxml class called Obj1. Somewhere in my code I do:
> > var _obj1 = new Obj1();
> >
> > What I need is to provide some variable to Obj1 for its
initialization. A
> > reason for that is because Obj1 has children that need that variable
for
> > their initialization.
> > But because I cannot send a parameter to Obj1's constructor I dont know
> how
> > to solve my problem.
> > Any idea?
> >
> > Thanks
> >
>
