Posted By

chrisaiv on 02/11/08


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as3


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AS3: Using Loader for SWFs, JPEGs, GIF, and PNGs


 / Published in: ActionScript 3
 

The Loader class is used for handling Bitmap data such as jpegs, pngs and gifs. The only handlers most will find relevant are progressHandler and onCompleteHandler but I listed all of the available ones for people interested in creating bulletproof apps.

  1. /********************************
  2. Event Listeners
  3. ********************************/
  4. var imgLoader:Loader = new Loader();
  5. initBasicListeners( imgLoader );
  6. imgLoader.contentLoaderInfo.addEventListener(ProgressEvent.PROGRESS, progressHandler, false, 0, true);
  7. imgLoader.contentLoaderInfo.addEventListener(Event.COMPLETE, onCompleteHandler, false, 0, true);
  8. imgLoader.load(new URLRequest(asset));
  9.  
  10. //These Event Listeners are used a lot so let's try to minimize redundancies
  11. function initBasicListeners(dispatcher:IEventDispatcher):void
  12. {
  13. dispatcher.addEventListener(HTTPStatusEvent.HTTP_STATUS, httpStatusHandler, false, 0, true);
  14. dispatcher.addEventListener(SecurityErrorEvent.SECURITY_ERROR, securityErrorHandler, false, 0, true);
  15. dispatcher.addEventListener(IOErrorEvent.IO_ERROR, ioErrorHandler, false, 0, true);
  16. }
  17.  
  18. /********************************
  19. Event Handlers
  20. ********************************/
  21. function httpStatusHandler (e:Event):void
  22. {
  23. //trace("httpStatusHandler:" + e);
  24. }
  25. function securityErrorHandler (e:Event):void
  26. {
  27. trace("securityErrorHandler:" + e);
  28. }
  29. function ioErrorHandler(e:Event):void
  30. {
  31. trace("ioErrorHandler: " + e);
  32. }
  33. function progressHandler(e:Event):void
  34. {
  35. trace(e.currentTarget.bytesLoaded + " / " + e.currentTarget.bytesTotal);
  36. }
  37.  
  38. function onCompleteHandler (e:Event):void
  39. {
  40. trace("imgCompleteHandler:" + e.currentTarget.content + " " + e.currentTarget.loader);
  41. addChild( e.currentTarget.loader );
  42. }

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