package asutil.style

{

	

	import asutil.construct.impl.Hashtable;

	

	import flash.display.DisplayObject;

	

	import mx.effects.Fade;

	import mx.effects.Sequence;

	/**

	* ????

	*/ 

	public class Glitter

	{

		/**

		 * ???

		 */ 

		public function Glitter(argObject:Object)

		{

			glitterTable = new Hashtable;

			//??????? ??? 

			if(null == argObject.glitterEles){

				throw new Error("Invaild glitter elemsnts.");

			}

			 this.glitterEles = argObject.glitterEles; 

				

			//????????????????2??????

			if(null != argObject.interval){

				this.interval = argObject.interval;		

  			}

  			

  			initEffect();

		}

		/**

		 * ????

		 */ 

		public function play():void{

		        var effSeq:Sequence = glitterTable.find(glitterEles) as Sequence;

		        if(  null == effSeq){

			    	//?????

		        	initEffect();

		        	//????

		        	effSeq = glitterTable.find(glitterEles) as Sequence;

		        }

		        	/**

		        	 * ?????play????

		        	 * ???play???flex???????????????

		        	 * targets???????????

		        	 * ?resume????????????

		        	 */ 	

				    effSeq.resume();

		}

		

		/**

		 * ????

		 */ 

		public function pause():void{

		        var effSeq:Sequence = glitterTable.find(glitterEles) as Sequence;

		        if(  null != effSeq){

		        	effSeq.pause();

			        //????alpha???1

			        var eleArray:Array = effSeq.targets;

					eleArray.forEach(function(ele:DisplayObject,index:int,eleArray:Array):void{

						ele.alpha = 1;

					})

		        }   

		}

		

		/**

		 * ??????????

		 */ 

		public function stop():void{

		        pause();

		        glitterTable.remove(glitterEles);

		}

		

		/**

		 * ???????????

		 */ 

		private function initEffect():void{

					//?? ??

					var eff1:Fade = new Fade;

					eff1.duration = this.interval;

					eff1.alphaTo = 0

					

					//?? ??

					var eff2:Fade = new Fade;

					eff2.duration = this.interval;

					eff2.alphaTo=1

					

					var effSeq:Sequence = new Sequence;

					effSeq.addChild(eff1);

					effSeq.addChild(eff2);

					effSeq.repeatCount = 0;

					 

					effSeq.targets = glitterEles;

					effSeq.play();

					effSeq.pause();

					glitterTable.add(this.glitterEles,effSeq);

		}

		

		/**

		 * ?????????

		 */ 

		private var glitterEles:Array;

		/**

		 * ???????1?

		 */ 

		private var interval:Number = 1000;

		/**

		 * ???????????global??

		 */ 

		private static var glitterTable:Hashtable;



	}

}