[Tweener] Getting tween target values

[Makc]

as another alternative, you could provide event triggered from
addTween that would have {...} object in it. Using this event, users
could save latest target for their reference, or change it on the fly.

On Mon, Jul 28, 2008 at 8:42 PM, Zeh Fernando <zeh at zehfernando.com> 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
> _______________________________________________
> Tweener mailing list
> Tweener at lists.caurinauebi.com
> http://lists.caurinauebi.com/listinfo.cgi/tweener-caurinauebi.com
>