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Using Actionscript 3 Tween for everything

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Programming

You may probabely know that tween class does not work with anything other than simple numeric object properties. This is an issue sometimes becuase you might want to tween a function! or a property of a child object or even an string! There are plenty of third-party classes out there for extending the Tween class, but if you don't need all other features they offer and prefer to keep your swf file's size small i must tell you that there is a simple workaround.

What we're going to do is using dynamic objects. We create a new object and add a property to it :

var myObject={'percent':0}

Then we tween that property :

var myTween:Tween = new Tween(
	myObject,//Object
	"percent", //Property
...

Now we can access the property within events :

myTween.addEventListener(TweenEvent.MOTION_CHANGE, myTweenOnUpdate);
function myTweenOnUpdate(e:Event):void {
	trace(myObject.percent);
}

 

Sample code :

import fl.transitions.Tween;
import fl.transitions.easing.*;
import fl.transitions.TweenEvent;

var myObject={'percent':0}
var myTween:Tween = new Tween(
	myObject,//Object
	"percent", //Property
	Strong.easeOut, //Function
	0, //Start Number
	100, //Finish Number
	10, //Duration
	true //useSeconds
);
myTween.addEventListener(TweenEvent.MOTION_CHANGE, myTweenOnUpdate);
function myTweenOnUpdate(e:Event):void {
	trace(myObject.percent);
	
	myFunction(myObject.percent);
	
	if (myObject.percent>10) {
		anotherObject.name='Yes';
	}

	anotherObject.childObject.number=percent;
}
myTween.start()

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