VIEW EXAMPLE
DOWNLOAD SOURCE

If you do alot of banners or work on projects with small filesize constraints, you should be hip to TweenLite written by Jack Doyle. This is a powerful Object Tweening engine that is incredibly small in file size (about 2.5K or so). Other Tweening Engines such as Caurina Tweener are a whopping 10K. That is alot of resources! One thing that TweenLite does not natively have which we at ICG need on a frequent basis is the ability to tween the timeline of a MovieClip. The reason TweenLite doesnt have this feature is because it’s original purpose is to be small in filesize and not bloated by excessive bells and whistles. The following is a workaround without changing Jack’s source files:

*DISCLAIMER: The following modification is using TweenLite VERSION: 5.8, it may not work with future versions of TweenLite.

//======================================================

import gs.TweenLite;
class gs.TweenLiteEnhanced {
public static function to ($obj:Object, $time:Number, $params:Object):Void {
if ($params._frame) {
$obj._frame = $obj._currentframe;
$params.onUpdateNew = $params.onUpdate;
$obj.onUpdate = function () {
$obj.gotoAndStop (Math.ceil ($obj._frame));
$params.onUpdateNew ();
};
$params.onUpdate = $obj.onUpdate;
}
TweenLite.to ($obj,$time,$params);
}
}

//======================================================

USE:
TweenLiteEnhanced.to(mcBox, 5, { _frame:300})
// mcBox is the name of the MovieClip

It works by injecting a function into the MovieClip which runs a gotoAndStop to the current value of the custom _frame property. It gets called on every update (the “onUpdate()” method). It only adds about 300 bytes above the class. Try it out, let me know what you think.