My code has gotten too complex to post, but a search of the archives
here found a great example by a fellow flexcoder. I have posted it
below.
Note, there has been a recent discussion about making the singleton more
bullet proof by preventing use of "new" , but I couldn't get it to work
and moved on for the time being. Search for "SingletonEnforcer"; if you
want.
Tracy
The principle of a model locator is simple. Create one object, create a
public API for the one instance and store your data in the one instance
while using data binding to dynamically update your public API as it
changes.
Note:
if you have a TextArea;
<mx:TextArea text="{MyLocator.getInstance().welcomText}" />
and somwhere else in your app you set the locators public property;
MyLocator.getInstance ().welcomText = "Hello World";
Then you text is instantly updated. The same applies to the text EXCEPT,
you need this in a change event from my testing if you are tracking
someone typing text and don't explictly set the 'text' property of the
TextArea.
Here is the quasi class
Class
--------------------------------------------
package my.package
{
[Bindable]
public class MyLocator
{
private static var instance:MyLocator = null;
/**
* Returns the single instance.
*/
public static function getInstance():MyLocator
{
if (!instance)
instance = new MyLocator();
return MyLocator;
}
public function MyLocator()
{
super();
// you could throw an error here if instance is already crated
// you could initialize things here
}
/**
* This is automatically bindable since the bindable tag is a
* above the class keyword.
*/
public var welcomeText:String = "HelloWorld";
}
}
Peace, Mike
________________________________
From: [email protected] [mailto:[EMAIL PROTECTED] On
Behalf Of Alan Gruskoff
Sent: Thursday, April 17, 2008 1:57 PM
To: [email protected]
Subject: [flexcoders] Re: Calling http services in separate file
I have been looking at best ways to use the data model and interested
in this technique. Could you post some of the relevant code that does
these things? Thanks
- Alan Gruskoff
--- In [email protected] <mailto:flexcoders%40yahoogroups.com>
, "Tracy Spratt" <[EMAIL PROTECTED]> wrote:
>
> Implement this as data model, using a bindable singleton. Keep the
> result data in that object.
>
> Implement public properties and methods to control the functionality.
> Bind the UI to the model's properties.
>
> I just used this technique for the first time myself, and it rocks.
> Tracy
