RE: [flexcoders] Component DataBinding issue

Sun, 15 Jan 2006 20:25:30 -0800

I’m not sure you need to call invalidate because probably calling createChild or destroyChild will cause invalidation.

 

From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of superabe superabe
Sent: Saturday, January 14, 2006 7:10 AM
To: [email protected]
Subject: Re: [flexcoders] Component DataBinding issue

 

Thanks Matt,

Will try that out.

 

So if I read you correctly I should prolly have a :

 

# a default value for rating

# a drawRatings()  method that is called from createChildren() and/or rating setter.

 

Now if I do call the drawRatings() method from the rating setter, would I need to call invalidate from the drawRatings method ?

 

- superabe


 

 


 

On 1/13/06, Matt Chotin <[EMAIL PROTECTED]> wrote:

I think the problem here is that rating is NaN when createchildren executes (because binding doesn't execute yet) and you run into an infinite loop.

 

Rather than doing your work in createChildren maybe you should have a separate method that holds onto the child objects and call it from createchildren or the setter for your rating property.  In that function it should see how many rating Images have been created, if the number is different from what you want you would destroy or create the appropriate number of children.  You may then need to call invalidate() after that (though createchild probably is good enough to do that).

 

HTH,

Matt

 

From: [email protected] [mailto:[email protected]] On Behalf Of superabe superabe
Sent: Monday, January 09, 2006 9:40 AM
To: [email protected]
Subject: [flexcoders] Component DataBinding issue

 

Hi there,

 

I have a custom AS component that seems to generate a script time-out error when I use databinding to set one of its params.

It works fine if I hard code the param value.

 

Any ideas as to why this may be happening ?

 

TIA

- superabe

 

Component code(RatingCell.as)

=======================

 

class RatingCell extends HBox{
 
 private var _rating:Number;
 private var maxRating:Number = 5;
 
 [Embed( "assets/images/rating_on.png" )]
    private var ratingOn:String;
 
 [Embed( "assets/images/rating_off.png" )]
    private var ratingOff:String;

 public function RatingCell(){
 
 }
 
 public function get rating():Number{
  return this._rating;
 }
 
 public function set rating(value:Number){
  if(value > maxRating){
   value = maxRating;
  }
  this._rating = value;
 }
  
 private function createChildren():Void{
  super.createChildren();
  Echo.debug("Rating Cell : createChildren");
  Echo.debug("rating = " + rating);
  //create active icon
  for(var i:Number=0;i<rating;i++){
   this.createChild(Image,undefined,{source:ratingOn}) ; 
  }
  //create inactive icon
  var startCounter:Number = rating;
  while(startCounter <= maxRating){
   this.createChild(Image,undefined,{source:ratingOff}) ; 
   startCounter++;
  }
 } 
}

Usage (Main.mxml)
================

<mx:Script>
 <![CDATA[
  var tempRating:Number = 5;
  
 ]]>
 </mx:Script>

<renderer:RatingCell rating="5" horizontalGap="1"/> // this works fine

<renderer:RatingCell rating="{tempRating}" horizontalGap="1"/> // this prompts script timeout error

 

 

 




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