I came across a problem I've had before with Flex yesterday. Sometimes Tweens (and anything that relies on a Tween such as a Move or a Resize) just doesn't work. You call play() but you don't get any events from the Tween, not even a tweenStart event.
On another project I had this problem and had to write my own Tween which I called WorkingTween. I had to re-implement it yesterday.
I think it is a better implementation anyway as it just uses event listeners, you don't have to supply a listener object and you don't have to implement tweenUpdate and tweenEnd method (which you have to make public when using Tween).
My Tween you supply a startValue, endValue, duration and optionally interval and easingFunction. You then add listeners to the standard TweenEvent - tweenStart, tweenUpdate and tweenEnd.
Has anyone else had trouble with the standard Tween?
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2 days ago