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AS3: Blackberry Playbook Boilerplate

/ Published in: ActionScript 3
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It seems that every time I work on a Blackberry app, by default I use some boilerplate code like this. The idea is simply to handle the background events whenever a user flips to another application.

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  1. package
  2. {
  3. 	import flash.desktop.NativeApplication;
  4. 	import flash.desktop.SystemIdleMode;
  5. 	import flash.display.Sprite;
  6. 	import flash.display.StageAlign;
  7. 	import flash.display.StageScaleMode;
  8. 	import flash.events.*;
  9. 	import flash.system.Capabilities;	
  10.  
  11. 	[SWF(width="1024", height="600", backgroundColor="#f1f1f1", frameRate="24")]
  12. 	public class Main extends Sprite
  13. 	{
  14. 		private static const FRAME_RATE_DEFAULT:Number	= 24;
  15. 		private static const FRAME_RATE_STANDBY:Number	= 4
  16.  
  17. 		public function Main()
  18. 		{
  19. 			stage.align = StageAlign.TOP_LEFT;
  20. 			stage.scaleMode = StageScaleMode.NO_SCALE;
  21. 			stage.addEventListener(Event.ACTIVATE, onActivateHandler, false, 0, true );
  22. 			stage.addEventListener(Event.DEACTIVATE, onDeactivateHandler, false, 0, true );
  23. 			addEventListener(Event.ADDED_TO_STAGE, init, false, 0, true );	
  24.  
  25. 			NativeApplication.nativeApplication.addEventListener(Event.EXITING, onExitHandler, false, 0, true ); 
  26.  
  27. 			checkEnvironment()
  28. 		}
  29.  
  30. 		private function checkEnvironment():void
  31. 		{
  32. 			if (Capabilities.manufacturer.indexOf('VMware') == -1) {
  33. 			    //It is a BlackBerry PlayBook Tablet.
  34. 			} else {
  35. 			    //It is a BlackBerry PlayBook Simulator.
  36. 			}		
  37. 		}
  38.  
  39. 		private function init( e:Event ):void
  40. 		{
  41. 			//Self Destruct Handler
  42. 			e.currentTarget.removeEventListener(e.type, arguments.callee );
  43. 		}
  44.  
  45. 		private function onExitHandler( e:Event ):void
  46. 		{
  47. 			NativeApplication.nativeApplication.exit(0);
  48. 		}
  49.  
  50. 		private function onActivateHandler( e:Event ):void
  51. 		{
  52. 			//trace( "Main::onActivateHandler:" );
  53. 			stage.frameRate = FRAME_RATE_DEFAULT;
  54. 			NativeApplication.nativeApplication.systemIdleMode = SystemIdleMode.KEEP_AWAKE;
  55. 		}
  56.  
  57. 		private function onDeactivateHandler( e:Event ):void
  58. 		{
  59. 			stage.frameRate = FRAME_RATE_STANDBY;
  60. 			NativeApplication.nativeApplication.systemIdleMode = SystemIdleMode.NORMAL;
  61. 		}		
  62. 	}
  63. }

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