source: Dev/trunk/src/client/dojox/flash/ExpressInstall.as

/**
 * Based on the expressinstall.as class created by Geoff Stearns as part
 * of the FlashObject library.
 *
 * Use this file to invoke the Macromedia Flash Player Express Install functionality
 * This file is intended for use with the FlashObject embed script. You can download FlashObject 
 * and this file at the following URL: http://blog.deconcept.com/flashobject/
 *
 * Usage: 
 *          var ExpressInstall = new ExpressInstall();
 *          
 *          // test to see if install is needed:
 *          if (ExpressInstall.needsUpdate) { // returns true if update is needed
 *              ExpressInstall.init(); // starts the update
 *          }
 *
 *      NOTE: Your Flash movie must be at least 214px by 137px in order to use ExpressInstall.
 *
 */

class ExpressInstall{
        public var needsUpdate:Boolean;
        private var updater:MovieClip;
        private var hold:MovieClip;
        
        public function ExpressInstall(){
                // does the user need to update?
                this.needsUpdate = (_root.MMplayerType == undefined) ? false : true;    
        }

        public function init():Void{
                this.loadUpdater();
        }

        public function loadUpdater():Void{
                System.security.allowDomain("fpdownload.macromedia.com");

                // hope that nothing is at a depth of 10000000, you can change this depth if needed, but you want
                // it to be on top of your content if you have any stuff on the first frame
                this.updater = _root.createEmptyMovieClip("expressInstallHolder", 10000000);

                // register the callback so we know if they cancel or there is an error
                var _self = this;
                this.updater.installStatus = _self.onInstallStatus;
                this.hold = this.updater.createEmptyMovieClip("hold", 1);

                // can't use movieClipLoader because it has to work in 6.0.65
                this.updater.onEnterFrame = function():Void {
                        if(typeof this.hold.startUpdate == 'function'){
                                _self.initUpdater();
                                this.onEnterFrame = null;
                        }
                }

                var cacheBuster:Number = Math.random();

                this.hold.loadMovie("http://fpdownload.macromedia.com/pub/flashplayer/"
                                                                                                +"update/current/swf/autoUpdater.swf?"+ cacheBuster);
        }

        private function initUpdater():Void{
                this.hold.redirectURL = _root.MMredirectURL;
                this.hold.MMplayerType = _root.MMplayerType;
                this.hold.MMdoctitle = _root.MMdoctitle;
                this.hold.startUpdate();
        }

        public function onInstallStatus(msg):Void{
                getURL("javascript:dojox.flash.install._onInstallStatus('"+msg+"')");
        }
}