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07.08.2008 at 06:50PM PDT, ID: 23548885
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8.6

Help showing progress in AS3 preloader

Asked by dlearman1 in Scripting Languages, ActionScript

Tags:

Having barely scratched the surface of AS2, I decided to just jump into AS3.  This preloader should load any DisplayObject and show a progress info feedback to the viewer.  It does load the asset correctly.  But I get several 2007 & 1009 errors relating to the progress info function.  I'm hoping someone can tell me what I'm doing (or not doing) to cause these errorsStart Free Trial 
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package com.pricelearman.loaders {
	
		
	import flash.display.*;
    import flash.events.*;
    import flash.net.URLRequest;
	import flash.geom.*;
	import flash.text.*;
 
	public class PreLoadDisplayObject extends Sprite {
		
		public var loadFrom:String;
		public var loadInto:DisplayObjectContainer;
		public var loadLevel:Number;
		public var isMonitored:Boolean;
		public var isVerbose:Boolean;
		public var origin:Point;
		
		private var _loadFrom:String;
		private var _loadInto:DisplayObjectContainer;
		private var _origin:Point;
		private var _loadLevel:Number;
		private var _loader:Loader;
		private var _loaderInfo:LoaderInfo;
		
		private var _isVerbose:Boolean = false;
		private var _dispObj:DisplayObject;
		private var _indentLevel:Number;
		
		private var _isMonitored:Boolean = false;
		private var _loadProgressText:String = "";
		private var _progressLabel:TextField;
		private var _progressFormat:TextFormat;
		private var _bytesLoaded:Number = 0;
		private var _bytesTotal:Number = 0;
		private var _barWidth:Number;
		
		
		
		// Constructor
		//
		public function PreLoadDisplayObject(loadFrom:String,
											 loadInto:DisplayObjectContainer,
											 origin:Point,
											 loadLevel:Number,
											 isMonitored:Boolean,
											 isVerbose:Boolean
											 ) {
			
			createLoader();
                                                      
      		if (isMonitored) createProgressInfo();
 
			loadDisplayObject(loadFrom, loadInto, origin, loadLevel, isMonitored, isVerbose);
			
		}	// End Constructor
		
		
		private function createLoader():void {
		
			_loader = new Loader();
			_loaderInfo = _loader.contentLoaderInfo;		// shortcut variable
		
			_loaderInfo.addEventListener(Event.COMPLETE, onComplete, false, 0, true);
			_loaderInfo.addEventListener(Event.OPEN, onOpen, false, 0, true);
			_loaderInfo.addEventListener(ProgressEvent.PROGRESS, onProgress, false, 0, true);
			_loaderInfo.addEventListener(HTTPStatusEvent.HTTP_STATUS, onHTTPStatusEvent, false, 0, true);
			_loaderInfo.addEventListener(IOErrorEvent.IO_ERROR, onIOError, false, 0, true);
			_loaderInfo.addEventListener(Event.INIT, onInit, false, 0, true);
			_loaderInfo.addEventListener(Event.UNLOAD, onUnloadContent, false, 0, true);
			
		}	// end createLoader
		
		
		private function createProgressInfo():void {
			
			_progressFormat = new TextFormat();
			_progressFormat.font = "sans";
			_progressFormat.size = 14;
			_progressFormat.color = 0x999999;
			
			_progressLabel = new TextField();
			_progressLabel.autoSize =TextFieldAutoSize.LEFT;
			_progressLabel.border = true;
			_progressLabel.background = true;
			_progressLabel.selectable = false;
			_progressLabel.text = "Loading ... ";
			_progressLabel.setTextFormat(_progressFormat);
			
		}	// end createProgressInfo
		
		
		private function loadDisplayObject(loadFrom:String, 
										   loadInto:DisplayObjectContainer,
										   origin:Point,
										   loadLevel:Number,
										   isVerbose:Boolean,
										   isMonitored
										   ):void {
			
			_loadFrom = loadFrom;
			_loadInto = loadInto;
			_origin = origin;
			_loadLevel = loadLevel;
			_isMonitored = isMonitored;
			_isVerbose = isVerbose;
			
			try {
				_loader.load(new URLRequest(_loadFrom));
				} catch (err:Error) {
				trace("Unable to load content:\n"+err.message);
				}
				
			// test if _progressLabel is already a decendent of the
			// loader object, if not add it
			//
			if (!contains(_progressLabel)) {
				addChild(_progressLabel);
			}
			
			_progressLabel.x = (stage.width/2) - (_progressLabel.width/2);
			_progressLabel.y = (stage.height/2) - (_progressLabel.height/2);
			
		}	// end loadDisplayObject
			
		
		
		private function onOpen(evt:Event):void {
			
			if(isVerbose) {
				trace("Loading has begun");
			}
 
			_progressLabel.visible = true;
			_loadInto.visible = false;
			evt.target.content.stop();
			
		}	// end onOpen
		
		
		private function onProgress(evt:ProgressEvent):void {
			
			var _percentLoaded:int = Math.round((evt.bytesLoaded / evt.bytesTotal) * 100);
			
			showProgress(_percentLoaded, _progressLabel);
			
		}	// end onProgress
		
		
		private function onInit(evt:Event):void {
			
			trace("Loaded Asset Properties are now accessible");
			
			if(_isVerbose) {
				trace("Content Initialized Properties");
				trace("  url: ", evt.target.url);
				trace("  Same Domain: ", evt.target.sameDomain);
				trace("");
				
				if(evt.target.contentType == "application/x-shockwave-flash") {
					trace("  SWF Version: ", evt.target.swfVersion);
					trace("  ActionScript Version: ", evt.target.actionScriptVersion);
					trace("  Frame Rate: ", evt.target.frameRate);
					trace("");
				}
			}
			
			_loaderInfo.removeEventListener(Event.INIT, onInit);
			
		}	// end onInit
				
				
		private function onComplete(evt:Event):void {
			
			_loaderInfo.removeEventListener(Event.COMPLETE, onComplete);
			_loaderInfo.removeEventListener(Event.OPEN, onOpen);
			_loaderInfo.removeEventListener(ProgressEvent.PROGRESS, onProgress);
			_loaderInfo.removeEventListener(HTTPStatusEvent.HTTP_STATUS, onHTTPStatusEvent);
			_loaderInfo.removeEventListener(IOErrorEvent.IO_ERROR, onIOError);
			
			// variable is typed as * because content property returns an Object of type
			// DisplayObject. Calling a method on a DisplayObject will throw an error, if the
			// method isn't defined in the DisplayObject Class.
			//
			var loadedAsset:* = evt.target.content;
		
			_loadInto.addChildAt(loadedAsset, _loadLevel);
			loadedAsset.dispatchEvent(new Event("displayObjectLoaded"));
			
			loadedAsset.x = _origin.x;
			loadedAsset.y = _origin.y;
			
			removeChild(_progressLabel);
			//_loadInto.visible = true;
			//loadedAsset.play();
			
			trace("Loading is Complete");
			trace("");
/*			
			if(verbose) {
				
				traceChildren(stage, 0);
				
			}
*/		
		}	// end onComplete
		
		
		private function showProgress(_percentLoaded, _progressHolder):void {
			
			_barWidth = _percentLoaded;
			_progressLabel.text = "Loading ...  "+String(Math.ceil(_percentLoaded))+" %";
			
	
			_progressHolder.clear();
			
			// draw border
			//
			_progressHolder.moveTo(0, 0);
			_progressHolder.lineStyle(1, 0x000000, 100);
			_progressHolder.beginFill(0xCCCCCC, 80);
			_progressHolder.lineTo(100, 0);
			_progressHolder.lineTo(100, 20);
			_progressHolder.lineTo(0, 20);
			_progressHolder.lineTo(0, 0);
			_progressHolder.endFill();
			
			// draw bar
			//
			_progressHolder.moveTo(0,  9);
			_progressHolder.lineStyle(2, 0xFF0000, 100);
			_progressHolder.lineTo(_barWidth, 9);
			_progressHolder.endFill();
			
		}	// end showProgress
		
		
		private function onHTTPStatusEvent(evt:HTTPStatusEvent):void {
			
			if(_isVerbose) {
				trace("HTTP Status Code: "+evt.status);
			}
			
			//if(evt.status == "URLNotFound") {
				//_errorMessage.text = "Error: Media Not Found /n Please report this error to the Webmaster";
				//_progressHolder.clear();
				
			//} else if(evt.status == "LoadNeverCompleted") {
				//_errorMessage.text = "Error: Transfer Failed /n Please report this error to the Webmaster";
				//_progressHolder.clear();
			//}
			
		}	// end onHTTPStatus
		
		
		private function onIOError(evt:IOErrorEvent):void {
			
			if(_isVerbose) {
				trace("A loading error has occurred:\n", evt.text);
			}
			
			_progressLabel.text = "Error: A Loading Error Has Occurred /n Please report this error to the Webmaster";
			//_progressHolder.clear();
			
		}	// end onIOError
		
		
		private function onUnloadContent(evt:Event):void {
			
			_loaderInfo.removeEventListener(Event.UNLOAD, onUnloadContent);
			
			if(_isVerbose) {
				trace("Unload handler:\n", evt);
			}
			
		}	// end onUnloadContent
		
 
		private function padIndent(indents:int):String {
			var indent:String = "";
			for (var i:uint = 0; i < indents; i++) {
				indent += "    ";
			}
			return indent;
		}		
			
	}	// end PreLoader
	
}	// End Package
Attachments:
 
leafWoman.jpg (17 KB) (File Type Details) 
jpg of woman laying on leaves
jpg of woman laying on leaves
 
 
Keywords: Help showing progress in AS3 preloa…
Title
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[+][-]07.09.2008 at 05:41AM PDT, ID: 21962877

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About this solution

Zones: Scripting Languages, ActionScript
Tags: Flash AS3 preload
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Solution Provided By: blue-genie
Participating Experts: 1
Solution Grade: A
 
 
[+][-]07.09.2008 at 09:39AM PDT, ID: 21965627

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[+][-]07.09.2008 at 10:28AM PDT, ID: 21966107

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[+][-]07.09.2008 at 11:47AM PDT, ID: 21966943

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