[Tweener] Getting tween target values

[Bradley]

That's awesome! I'm still mulling over whether the way I'm going  
about my project is right, but this is helpful in any case. Thanks!

On Jul 28, 2008, at 10:42 AM, Zeh Fernando wrote:

> Hey Bradley,
>
>> I've run into this issue before. Within this project there are  
>> several places that would benefit from the added feature. In  
>> general I think it would make applications simpler if it weren't  
>> required to store such tween parameters in a variable every time  
>> we might need to retrieve them.
>
> I admit this request is not something so out of this world.  
> However, with its current architecture, Tweener doesn't allow you  
> to access the tweenings already in place; you can have getTweens,  
> but it's just to know if some property of some object is already  
> tweening.
>
> Giving your needs, and the ones that other people may have too, the  
> best solution would be to have a way to access the tweening  
> information *instance*, and then you could to changes to it. This  
> is something I've kept on my mind for a while and something I was  
> tackling with a moderately recent version of Tweener I was working  
> on, but again, this is not something the current architecture has.
>
> This is all just to say that yes, your request makes sense.
>
> In the current version, for your specific case, the best solution  
> would be adding a new function to Tweener to get the tweening  
> information for a given object/property. Something like this (AS3):
>
> public static function getTweenInfo (__obj:Object):TweenListObj {
> 	if (!Boolean(_tweenList)) return null;
> 	for (i:uint = 0; i<_tweenList.length; i++) {
> 		if (Boolean(_tweenList[i]) && _tweenList[i].scope == __obj) {
> 			return _tweenList[i];
> 		}
> 	}
> 	return null;
> }
>
> This returns a TweenListObj listing the tweening information of an  
> object (see the class for more information). Specific properties  
> (including their target values) are on a separate array. If you  
> need that:
>
> public static function getTweenPropertyInfo (__obj:Object,  
> __prop:String):PropertyInfoObj {
> 	if (!Boolean(_tweenList)) return null;
> 	for (i:uint = 0; i<_tweenList.length; i++) {
> 		if (Boolean(_tweenList[i]) && _tweenList[i].scope == __obj &&  
> _tweenList[i].properties[__prop] != null) {
> 			return _tweenList[i].properties[__prop];
> 		}
> 	}
> 	return null;
> }
>
> Usage:
>
> import caurina.transitions.PropertyInfoObj;
> import caurina.transitions.Tweener;
>
> Tweener.addTween(myobj, {x:10, time:1});
>
> trace ("target value of x is "+getTweenPropertyInfo(myObj,  
> "x").valueComplete);
>
> Those classes - TweenListObj, and PropertyInfoObj - are pretty  
> internal and it's likely they'll change a good bit in the future.  
> However, if you build simple methods and functions on the Tweener  
> class that handle them, there's a good amount of stuff you can add  
> to it. You may even just add a simpler getTweenTargetValue() method  
> directly if that works better.
>
> public static function getTweenTargetValue (__obj:Object,  
> __prop:String):Number {
> 	if (!Boolean(_tweenList)) return null;
> 	for (i:uint = 0; i<_tweenList.length; i++) {
> 		if (Boolean(_tweenList[i]) && _tweenList[i].scope == __obj &&  
> _tweenList[i].properties[__prop] != null) {
> 			return _tweenList[i].properties[__prop].valueComplete;
> 		}
> 	}
> 	return NaN;
> }
>
> So, something like this. I just wrote this without testing, but it  
> should work unless I forgot something pretty obvious.
>
> Zeh
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