Re: [flexcoders] Setting properties to children technique

[Sergey Kovalyov]

Gordon, thank you for this answer. Are there any alternatives? I have one component inside another with the same properties. Actually, the second one is the pop up and the first one is a kind of "decorator". Together they work the way similar to ComboBox (ComboBox itself and List respectively also have similar properties). According to the example provided, I need to make two variables (flag and cache) for each property in both classes. It seems a bit overweighted for me.

On 9/29/06, Gordon Smith <[EMAIL PROTECTED]> wrote:



Yes, you should be using invalidation. The typical pattern for doing this is as follows:
 
    private var _buttonLabel:String = "";
 
    private var buttonLabelChanged:Boolean = false;

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RE: [flexcoders] Setting properties to children technique

[Gordon Smith]

Yes, you should be using invalidation. The
typical pattern for doing this is as follows:

 

    private var
_buttonLabel:String = "";

 

    private var buttonLabelChanged:Boolean
= false;

 

    public function get
buttonLabel():String

    {

    return
_buttonLabel;

    }

 

    public function set
buttonLabel(value:String):void

    {

   
_buttonLabel = value;

   
buttonLabelChanged = true;

 

   
invalidateProperties();

    }

 

    override protected
function commitProperties():void

    {

   
super.commitPropertie();

 

   
if (buttonLabelChanged)

   
{

   
myButton.label = _buttonLabel;

   
buttonLabelChanged = false;

   
}

    }

 

You can find many examples of thsi pattern
in the framework source code.

 

- Gordon

 

 

 









From: flexcoders@yahoogroups.com [mailto:flexcoders@yahoogroups.com] On Behalf Of Sergey Kovalyov
Sent: Friday, September 29, 2006
9:18 AM
To: flexcoders@yahoogroups.com
Subject: [flexcoders] Setting
properties to children technique



 







Hi All!

Imagine, I have a component based on VBox and Button child myButton
inside it. I have a property (getter/setter) in component buttonLabel:

public function get buttonLabel() : String {
return myButton.label;
}

public function set buttonLabel(buttonLabel : String) : void {
myButton.label = buttonLabel;
}

Sure, I get null pointer exception, while instantiating component and
setting its buttonLabel property, because myButton is not created yet:

"My Label" />

Probably, some invalidation must be used. invalidateProperties() >
commitProperties(), true? Are there any other ideas?

Sergey.






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