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Create a Preloader class in Actionscript 3

/ Published in: ActionScript 3
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A complete example of how we can create a Preloader in actionscript3 to load an external .swf file.

STRUCTURE
------------------
Source Swf
|_ Main.fla
|_ Main.as
|_ Main.swf
Preloader Swf
|_

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  1. /*
  2. * main.fla -> main.as 
  3. */
  4.  
  5. package  
  6. {
  7. 	import flash.display.MovieClip;
  8. 	import flash.events.Event;
  9. 	/**
  10. 	 * ...
  11. 	 * @author Faisal
  12. 	 */
  13. 	public class Main extends MovieClip
  14. 	{
  15.  
  16. 		public function Main() 
  17. 		{
  18.  
  19. 			if (stage)
  20. 			{
  21. 				init();		
  22. 			}
  23. 			else
  24. 			{
  25. 				addEventListener(Event.ADDED_TO_STAGE, init);	
  26. 			}			
  27.  
  28. 		}
  29.  
  30.  
  31. 		private function init(e:Event = null):void 
  32. 		{
  33. 			trace("I am main file loaded from Main.fla :)");			
  34. 		}
  35.  
  36. 	}
  37.  
  38. }
  39.  
  40.  
  41.  
  42. /*
  43. * preloader.fla -> preloader.as
  44. */
  45.  
  46. package  
  47. {
  48. 	import flash.display.Loader;
  49. 	import flash.display.MovieClip;
  50. 	import flash.events.Event;
  51. 	import flash.events.ProgressEvent;
  52. 	import flash.net.URLRequest;
  53. 	/**
  54. 	 * ...
  55. 	 * @author Faisal
  56. 	 */
  57. 	public class Preloader extends MovieClip
  58. 	{
  59.  
  60. 		public function Preloader() 
  61. 		{
  62. 			if (stage)
  63. 			{
  64. 				init();
  65. 			}
  66. 			else
  67. 			{
  68. 				addEventListener(Event.ADDED_TO_STAGE, init);
  69. 			}
  70.  
  71. 		}
  72.  
  73. 		private function init():void 
  74. 		{
  75. 			var url:URLRequest = new URLRequest("Main.swf");
  76. 			var myLoader:Loader = new Loader();
  77. 			myLoader.contentLoaderInfo.addEventListener(Event.COMPLETE, onLoaderComplete);
  78. 			myLoader.contentLoaderInfo.addEventListener(ProgressEvent.PROGRESS, onLoaderProgress);
  79.  
  80. 			myLoader.load(url);
  81. 		}
  82.  
  83. 		private function onLoaderComplete(e:Event):void 
  84. 		{
  85. 			trace(e.currentTarget.content);
  86. 			var a:MovieClip = new MovieClip();
  87. 			stage.addChild(a);
  88. 			a.addChild(e.currentTarget.content)
  89. 		}
  90.  
  91. 		private function onLoaderProgress(e:ProgressEvent):void 
  92. 		{
  93. 			var loaded:Number = (e.bytesLoaded / e.bytesTotal) * 100;
  94. 			trace(loaded);
  95. 		}
  96.  
  97. 	}
  98.  
  99. }

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