Accessing Stage object was pretty simple in previous versions of Action Script. However, it’s little different in Action Script 3. Sprits (movie clip) have property named stage (notice small “s”). One can use this property to access the Stage Object and respond to the Stage object’s Resize event.

Here is the AS3 code to resize SWF depending on browser size:

Class myStage:

package {

import flash.display.Stage;
import flash.display.Sprite;
import flash.display.StageAlign;
import flash.display.StageScaleMode;
import flash.events.Event;

public class myStage extends Sprite {

private var _mc:Sprite;
private var mcStage:Stage;

public function myStage(_mc:Sprite){
this._mc = _mc;
mcStage = _mc.stage;
addStageListener();
}

public function addStageListener() {
mcStage.scaleMode = StageScaleMode.NO_SCALE;
mcStage.align = StageAlign.TOP_LEFT;
mcStage.addEventListener(Event.RESIZE, resizeHandler);
}

private function resizeHandler(event:Event):void {
trace("stageWidth: "+mcStage.stageWidth);
trace("stageHeight: "+mcStage.stageHeight);
_mc.x = mcStage.stageWidth/2;
_mc.y = mcStage.stageHeight/2;
}
}
}

Now, create object of myStage and pass movieclip reference (which you want to align at center of stage) as parameter:

var mystage:myStage = new myStage(_mc);

Publish the flash file. Be sure to put 100% as value for Height and Width parameters in Object and param tag in HTML.

All set! Now you can test your file. SWF should now respond as you resize the browser window.

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