Re: [flexcoders] Logical place for data?

Michael Schmalle Fri, 06 Oct 2006 04:39:20 -0700

Hi,

You don't neccessarily 'have' to use 'C' ;-)

All you need to do is understand what a 'singleton' pattern means and what bindable means.

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

On 10/6/06, Samúel Jónasson <[EMAIL PROTECTED]> wrote:

Tom Chiverton wrote:
On Friday 06 October 2006 10:05, Samúel Jónasson wrote:

What is the recommended way? It is rather clumsy binding to
Application.application and I also think it makes sense to store all the
data in one place - not divide it in to multiple places.

Have you considered something like Cairngorn's ModelLocator singleton ?
Hi,

Actually I haven't looked at all into Cairngorn. I guess it exists for a reason and that I should look into it. I just wish they had come up with a better name for it. Not being able to pronounce it's name has kept me away :)

Sammi
    

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Re: [flexcoders] Logical place for data?

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