/** * Box2.as: ActionScript code to demonstrate JavaScript <-> Flash communication *          using the ExternalInterface class of Flash 8. * * Compile this code using mtasc with a command like this: * *   mtasc -version 8 -header 300:300:1 -main -swf Box2.swf Box2.as * * If you use the Flash IDE instead, insert a call to Box.main() in the * first frame of your movie. */import flash.external.ExternalInterface;class Box {    static function main() {        // Use the new External Interface to export our ActionScript function.        // This makes it very easy to invoke the function from JavaScript,        // but it is only supported by Flash 8 and later.        // First argument of addCallback is the name by which the function        // will be known in JavaScript.  The second argument is the         // ActionScript object on which the function will be invoked.  It        // will be the value of the 'this' keyword.  And the third argument        // is the function that will be called.        ExternalInterface.addCallback("drawBox", null, function(x,y,w,h) {                                          _root.beginFill(0xaaaaaa, 100);                                          _root.lineStyle(5, 0x000000, 100);                                          _root.moveTo(x,y);                                          _root.lineTo(x+w, y);                                          _root.lineTo(x+w, y+h);                                          _root.lineTo(x, y+h);                                          _root.lineTo(x,y);                                          _root.endFill();                                          return w*h;                                      });                // This is an ActionScript event handler.        // Tell JavaScript about mouse clicks using ExternalInterface.call().        _root.onMouseDown = function() {            ExternalInterface.call("reportMouseClick",                                   _root._xmouse, _root._ymouse);        }                // Tell JavaScript that we're fully loaded and ready to be scripted        ExternalInterface.call("flashReady");    }}