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copied!<p>If you have good control over when the height of any given sprite is going to change then you can use a custom event. The setup would look something like this:</p> <pre><code>var UPDATED_EVENT:String = "updated"; var i:int = 0; var count:int = sprites.length; // this is the length of your array for (i = 0; i < count; i++) { sprites[i].addEventListener(UPDATED_EVENT, calc); } function calc(e:Event = null):void { // here goes your positioning code for (i = 0; i < count; i++) { if (i==0) sprites[i].y = 0; else sprites[i].y = sprites[i-1].y + sprites[i-1].height; } } calc(); </code></pre> <p>Then just make sure that whenever you change the height of one of your sprites you do something like this:</p> <pre><code>mySprite.dispatchEvent(new Event(UPDATED_EVENT)); </code></pre> <p>If you're spread across multiple classes (and you probably should be) then you can make the UPDATED_EVENT string a const in a separate event class and access it from both.</p> <p>That's still not a perfect solution for you - if you want, you can figure out which sprite is changing its height and only recalc the sprites that come after it, and that'll make your code more efficient - but it beats calling an enterframe event every time.</p> <p>Now, if you were using Flex you'd have even more tools at your disposal - you could probably use databinding to automate almost all of this, or at least use the changed event to automatically dispatch events for you, but that's neither here nor there!</p>

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