package {
    import flash.display.*;
    import flash.utils.*;
    import flash.events.*;
  
    public class @ax-actionscript-events-Spinner extends Sprite {
      private var timer:Timer;
      private var rect:Sprite;
        
      public function @ax-actionscript-events-Spinner () {
        // Create a rectangle graphic
        rect = new Sprite();
        rect.x = 200;
        rect.y = 200;
        rect.graphics.lineStyle(1);
        rect.graphics.beginFill(0x0000FF);
        rect.graphics.drawRect(0, 0, 150, 75);
        addChild(rect);
  
        // Register to be notified when Flash Player gains or loses 
        // system focus
        addEventListener(Event.ACTIVATE, activateListener);
        addEventListener(Event.DEACTIVATE, deactivateListener);
  
        // Create a timer to use for animation
        timer = new Timer(50, 0);
        timer.addEventListener(TimerEvent.TIMER, timerListener);
      }
  
      // Rotates the rectangle graphic
      private function timerListener (e:TimerEvent):void {
        rect.rotation += 10;
      }
  
      // Handles Event.ACTIVATE events
      private function activateListener (e:Event):void {
        // Start rotating the rectangle graphic
        timer.start();
      }
  
      // Handles Event.DEACTIVATE events
      private function deactivateListener (e:Event):void {
        // Stop rotating the rectangle graphic
        timer.stop();
      }
    }
  }