1 /**
  2  * Copyright (c) 2006-2007, Bill W. Scott. All rights reserved.
  3  * This work is licensed under the Creative Commons Attribution 2.5 License. To view a copy 
  4  * of this license, visit http://creativecommons.org/licenses/by/2.5/ or send a letter to 
  5  * Creative Commons, 543 Howard Street, 5th Floor, San Francisco, California, 94105, USA.
  6  * This work was created by Bill Scott (billwscott.com, looksgoodworkswell.com).
  7  * The only attribution I require is to keep this notice of copyright & license 
  8  * in this original source file.
  9  * Version 0.6.1 - 07.08.2007
 10  */
 11 
 12 
 13 YAHOO.namespace("extension");YAHOO.extension.Carousel=function(carouselElementID,carouselCfg){this.init(carouselElementID,carouselCfg);};YAHOO.extension.Carousel.prototype={UNBOUNDED_SIZE:1000000,init:function(carouselElementID,carouselCfg){var oThis=this;this.getCarouselItem=this.getItem;var carouselListClass="carousel-list";var carouselClipRegionClass="carousel-clip-region";var carouselNextClass="carousel-next";var carouselPrevClass="carousel-prev";this._carouselElemID=carouselElementID;this.carouselElem=YAHOO.util.Dom.get(carouselElementID);this._prevEnabled=true;this._nextEnabled=true;this.cfg=new YAHOO.util.Config(this);this.cfg.addProperty("scrollBeforeAmount",{value:0,handler:function(type,args,carouselElem){},validator:oThis.cfg.checkNumber});this.cfg.addProperty("scrollAfterAmount",{value:0,handler:function(type,args,carouselElem){},validator:oThis.cfg.checkNumber});this.cfg.addProperty("loadOnStart",{value:true,handler:function(type,args,carouselElem){},validator:oThis.cfg.checkBoolean});this.cfg.addProperty("orientation",{value:"horizontal",handler:function(type,args,carouselElem){oThis.reload();},validator:function(orientation){if(typeof orientation=="string"){return("horizontal,vertical".indexOf(orientation.toLowerCase())!=-1);}else{return false;}}});this.cfg.addProperty("size",{value:this.UNBOUNDED_SIZE,handler:function(type,args,carouselElem){oThis.reload();},validator:oThis.cfg.checkNumber});this.cfg.addProperty("numVisible",{value:3,handler:function(type,args,carouselElem){oThis.reload();},validator:oThis.cfg.checkNumber});this.cfg.addProperty("firstVisible",{value:1,handler:function(type,args,carouselElem){oThis.moveTo(args[0]);},validator:oThis.cfg.checkNumber});this.cfg.addProperty("scrollInc",{value:3,handler:function(type,args,carouselElem){},validator:oThis.cfg.checkNumber});this.cfg.addProperty("animationSpeed",{value:0.25,handler:function(type,args,carouselElem){oThis.animationSpeed=args[0];},validator:oThis.cfg.checkNumber});this.cfg.addProperty("animationMethod",{value:YAHOO.util.Easing.easeOut,handler:function(type,args,carouselElem){}});this.cfg.addProperty("animationCompleteHandler",{value:null,handler:function(type,args,carouselElem){if(oThis._animationCompleteEvt){oThis._animationCompleteEvt.unsubscribe(oThis._currAnimationCompleteHandler,oThis);}
 14 oThis._currAnimationCompleteHandler=args[0];if(oThis._currAnimationCompleteHandler){if(!oThis._animationCompleteEvt){oThis._animationCompleteEvt=new YAHOO.util.CustomEvent("onAnimationComplete",oThis);}
 15 oThis._animationCompleteEvt.subscribe(oThis._currAnimationCompleteHandler,oThis);}}});this.cfg.addProperty("autoPlay",{value:0,handler:function(type,args,carouselElem){var autoPlay=args[0];if(autoPlay>0)
 16 oThis.startAutoPlay();else
 17 oThis.stopAutoPlay();}});this.cfg.addProperty("wrap",{value:false,handler:function(type,args,carouselElem){},validator:oThis.cfg.checkBoolean});this.cfg.addProperty("navMargin",{value:0,handler:function(type,args,carouselElem){oThis.calculateSize();},validator:oThis.cfg.checkNumber});this.cfg.addProperty("revealAmount",{value:0,handler:function(type,args,carouselElem){oThis.reload();},validator:oThis.cfg.checkNumber});this.cfg.addProperty("prevElementID",{value:null,handler:function(type,args,carouselElem){if(oThis._carouselPrev){YAHOO.util.Event.removeListener(oThis._carouselPrev,"click",oThis._scrollPrev);}
 18 oThis._prevElementID=args[0];if(oThis._prevElementID==null){oThis._carouselPrev=YAHOO.util.Dom.getElementsByClassName(carouselPrevClass,"div",oThis.carouselElem)[0];}else{oThis._carouselPrev=YAHOO.util.Dom.get(oThis._prevElementID);}
 19 YAHOO.util.Event.addListener(oThis._carouselPrev,"click",oThis._scrollPrev,oThis);}});this.cfg.addProperty("prevElement",{value:null,handler:function(type,args,carouselElem){if(oThis._carouselPrev){YAHOO.util.Event.removeListener(oThis._carouselPrev,"click",oThis._scrollPrev);}
 20 oThis._prevElementID=args[0];if(oThis._prevElementID==null){oThis._carouselPrev=YAHOO.util.Dom.getElementsByClassName(carouselPrevClass,"div",oThis.carouselElem)[0];}else{oThis._carouselPrev=YAHOO.util.Dom.get(oThis._prevElementID);}
 21 YAHOO.util.Event.addListener(oThis._carouselPrev,"click",oThis._scrollPrev,oThis);}});this.cfg.addProperty("nextElementID",{value:null,handler:function(type,args,carouselElem){if(oThis._carouselNext){YAHOO.util.Event.removeListener(oThis._carouselNext,"click",oThis._scrollNext);}
 22 oThis._nextElementID=args[0];if(oThis._nextElementID==null){oThis._carouselNext=YAHOO.util.Dom.getElementsByClassName(carouselNextClass,"div",oThis.carouselElem);}else{oThis._carouselNext=YAHOO.util.Dom.get(oThis._nextElementID);}
 23 if(oThis._carouselNext){YAHOO.util.Event.addListener(oThis._carouselNext,"click",oThis._scrollNext,oThis);}}});this.cfg.addProperty("nextElement",{value:null,handler:function(type,args,carouselElem){if(oThis._carouselNext){YAHOO.util.Event.removeListener(oThis._carouselNext,"click",oThis._scrollNext);}
 24 oThis._nextElementID=args[0];if(oThis._nextElementID==null){oThis._carouselNext=YAHOO.util.Dom.getElementsByClassName(carouselNextClass,"div",oThis.carouselElem);}else{oThis._carouselNext=YAHOO.util.Dom.get(oThis._nextElementID);}
 25 if(oThis._carouselNext){YAHOO.util.Event.addListener(oThis._carouselNext,"click",oThis._scrollNext,oThis);}}});this.cfg.addProperty("loadInitHandler",{value:null,handler:function(type,args,carouselElem){if(oThis._loadInitHandlerEvt){oThis._loadInitHandlerEvt.unsubscribe(oThis._currLoadInitHandler,oThis);}
 26 oThis._currLoadInitHandler=args[0];if(oThis._currLoadInitHandler){if(!oThis._loadInitHandlerEvt){oThis._loadInitHandlerEvt=new YAHOO.util.CustomEvent("onLoadInit",oThis);}
 27 oThis._loadInitHandlerEvt.subscribe(oThis._currLoadInitHandler,oThis);}}});this.cfg.addProperty("loadNextHandler",{value:null,handler:function(type,args,carouselElem){if(oThis._loadNextHandlerEvt){oThis._loadNextHandlerEvt.unsubscribe(oThis._currLoadNextHandler,oThis);}
 28 oThis._currLoadNextHandler=args[0];if(oThis._currLoadNextHandler){if(!oThis._loadNextHandlerEvt){oThis._loadNextHandlerEvt=new YAHOO.util.CustomEvent("onLoadNext",oThis);}
 29 oThis._loadNextHandlerEvt.subscribe(oThis._currLoadNextHandler,oThis);}}});this.cfg.addProperty("loadPrevHandler",{value:null,handler:function(type,args,carouselElem){if(oThis._loadPrevHandlerEvt){oThis._loadPrevHandlerEvt.unsubscribe(oThis._currLoadPrevHandler,oThis);}
 30 oThis._currLoadPrevHandler=args[0];if(oThis._currLoadPrevHandler){if(!oThis._loadPrevHandlerEvt){oThis._loadPrevHandlerEvt=new YAHOO.util.CustomEvent("onLoadPrev",oThis);}
 31 oThis._loadPrevHandlerEvt.subscribe(oThis._currLoadPrevHandler,oThis);}}});this.cfg.addProperty("prevButtonStateHandler",{value:null,handler:function(type,args,carouselElem){if(oThis._currPrevButtonStateHandler){oThis._prevButtonStateHandlerEvt.unsubscribe(oThis._currPrevButtonStateHandler,oThis);}
 32 oThis._currPrevButtonStateHandler=args[0];if(oThis._currPrevButtonStateHandler){if(!oThis._prevButtonStateHandlerEvt){oThis._prevButtonStateHandlerEvt=new YAHOO.util.CustomEvent("onPrevButtonStateChange",oThis);}
 33 oThis._prevButtonStateHandlerEvt.subscribe(oThis._currPrevButtonStateHandler,oThis);}}});this.cfg.addProperty("nextButtonStateHandler",{value:null,handler:function(type,args,carouselElem){if(oThis._currNextButtonStateHandler){oThis._nextButtonStateHandlerEvt.unsubscribe(oThis._currNextButtonStateHandler,oThis);}
 34 oThis._currNextButtonStateHandler=args[0];if(oThis._currNextButtonStateHandler){if(!oThis._nextButtonStateHandlerEvt){oThis._nextButtonStateHandlerEvt=new YAHOO.util.CustomEvent("onNextButtonStateChange",oThis);}
 35 oThis._nextButtonStateHandlerEvt.subscribe(oThis._currNextButtonStateHandler,oThis);}}});if(carouselCfg){this.cfg.applyConfig(carouselCfg);}
 36 this._origFirstVisible=this.cfg.getProperty("firstVisible");this._currLoadInitHandler=this.cfg.getProperty("loadInitHandler");this._currLoadNextHandler=this.cfg.getProperty("loadNextHandler");this._currLoadPrevHandler=this.cfg.getProperty("loadPrevHandler");this._currPrevButtonStateHandler=this.cfg.getProperty("prevButtonStateHandler");this._currNextButtonStateHandler=this.cfg.getProperty("nextButtonStateHandler");this._currAnimationCompleteHandler=this.cfg.getProperty("animationCompleteHandler");this._nextElementID=this.cfg.getProperty("nextElementID");if(!this._nextElementID)
 37 this._nextElementID=this.cfg.getProperty("nextElement");this._prevElementID=this.cfg.getProperty("prevElementID");if(!this._prevElementID)
 38 this._prevElementID=this.cfg.getProperty("prevElement");this._autoPlayTimer=null;this._priorLastVisible=this._priorFirstVisible=this.cfg.getProperty("firstVisible");this._lastPrebuiltIdx=0;this.carouselList=YAHOO.util.Dom.getElementsByClassName(carouselListClass,"ul",this.carouselElem)[0];if(this._nextElementID==null){this._carouselNext=YAHOO.util.Dom.getElementsByClassName(carouselNextClass,"div",this.carouselElem)[0];}else{this._carouselNext=YAHOO.util.Dom.get(this._nextElementID);}
 39 if(this._prevElementID==null){this._carouselPrev=YAHOO.util.Dom.getElementsByClassName(carouselPrevClass,"div",this.carouselElem)[0];}else{this._carouselPrev=YAHOO.util.Dom.get(this._prevElementID);}
 40 this._clipReg=YAHOO.util.Dom.getElementsByClassName(carouselClipRegionClass,"div",this.carouselElem)[0];if(this.isVertical()){YAHOO.util.Dom.addClass(this.carouselList,"carousel-vertical");}
 41 this._scrollNextAnim=new YAHOO.util.Motion(this.carouselList,this.scrollNextParams,this.cfg.getProperty("animationSpeed"),this.cfg.getProperty("animationMethod"));this._scrollPrevAnim=new YAHOO.util.Motion(this.carouselList,this.scrollPrevParams,this.cfg.getProperty("animationSpeed"),this.cfg.getProperty("animationMethod"));if(this._carouselNext){YAHOO.util.Event.addListener(this._carouselNext,"click",this._scrollNext,this);}
 42 if(this._carouselPrev){YAHOO.util.Event.addListener(this._carouselPrev,"click",this._scrollPrev,this);}
 43 var loadInitHandler=this.cfg.getProperty("loadInitHandler");if(loadInitHandler){this._loadInitHandlerEvt=new YAHOO.util.CustomEvent("onLoadInit",this);this._loadInitHandlerEvt.subscribe(loadInitHandler,this);}
 44 var loadNextHandler=this.cfg.getProperty("loadNextHandler");if(loadNextHandler){this._loadNextHandlerEvt=new YAHOO.util.CustomEvent("onLoadNext",this);this._loadNextHandlerEvt.subscribe(loadNextHandler,this);}
 45 var loadPrevHandler=this.cfg.getProperty("loadPrevHandler");if(loadPrevHandler){this._loadPrevHandlerEvt=new YAHOO.util.CustomEvent("onLoadPrev",this);this._loadPrevHandlerEvt.subscribe(loadPrevHandler,this);}
 46 var animationCompleteHandler=this.cfg.getProperty("animationCompleteHandler");if(animationCompleteHandler){this._animationCompleteEvt=new YAHOO.util.CustomEvent("onAnimationComplete",this);this._animationCompleteEvt.subscribe(animationCompleteHandler,this);}
 47 var prevButtonStateHandler=this.cfg.getProperty("prevButtonStateHandler");if(prevButtonStateHandler){this._prevButtonStateHandlerEvt=new YAHOO.util.CustomEvent("onPrevButtonStateChange",this);this._prevButtonStateHandlerEvt.subscribe(prevButtonStateHandler,this);}
 48 var nextButtonStateHandler=this.cfg.getProperty("nextButtonStateHandler");if(nextButtonStateHandler){this._nextButtonStateHandlerEvt=new YAHOO.util.CustomEvent("onNextButtonStateChange",this);this._nextButtonStateHandlerEvt.subscribe(nextButtonStateHandler,this);}
 49 var visibleExtent=this._calculateVisibleExtent();YAHOO.util.Event.onAvailable(this._carouselElemID+"-item-"+
 50 visibleExtent.start,this._calculateSize,this);if(this.cfg.getProperty("loadOnStart"))
 51 this._loadInitial();},clear:function(){var loadInitHandler=this.cfg.getProperty("loadInitHandler");if(loadInitHandler){this._removeChildrenFromNode(this.carouselList);this._lastPrebuiltIdx=0;}
 52 this.stopAutoPlay();this._priorLastVisible=this._priorFirstVisible=this._origFirstVisible;this.cfg.setProperty("firstVisible",this._origFirstVisible,true);this.moveTo(this._origFirstVisible);},reload:function(numVisible){if(this._isValidObj(numVisible)){this.cfg.setProperty("numVisible",numVisible);}
 53 this.clear();var visibleExtent=this._calculateVisibleExtent();YAHOO.util.Event.onAvailable(this._carouselElemID+"-item-"+visibleExtent.start,this._calculateSize,this);this._loadInitial();},load:function(){var visibleExtent=this._calculateVisibleExtent();YAHOO.util.Event.onAvailable(this._carouselElemID+"-item-"+visibleExtent.start,this._calculateSize,this);this._loadInitial();},addItem:function(idx,innerHTMLOrElem,itemClass){if(idx>this.cfg.getProperty("size")){return null;}
 54 var liElem=this.getItem(idx);if(!this._isValidObj(liElem)){liElem=this._createItem(idx,innerHTMLOrElem);this.carouselList.appendChild(liElem);}else if(this._isValidObj(liElem.placeholder)){var newLiElem=this._createItem(idx,innerHTMLOrElem);this.carouselList.replaceChild(newLiElem,liElem);liElem=newLiElem;}
 55 if(this._isValidObj(itemClass)){YAHOO.util.Dom.addClass(liElem,itemClass);}
 56 if(this.isVertical())
 57 setTimeout(function(){liElem.style.display="block";},1);return liElem;},insertBefore:function(refIdx,innerHTML){if(refIdx>=this.cfg.getProperty("size")){return null;}
 58 if(refIdx<1){refIdx=1;}
 59 var insertionIdx=refIdx-1;if(insertionIdx>this._lastPrebuiltIdx){this._prebuildItems(this._lastPrebuiltIdx,refIdx);}
 60 var liElem=this._insertBeforeItem(refIdx,innerHTML);this._enableDisableControls();return liElem;},insertAfter:function(refIdx,innerHTML){if(refIdx>this.cfg.getProperty("size")){refIdx=this.cfg.getProperty("size");}
 61 var insertionIdx=refIdx+1;if(insertionIdx>this._lastPrebuiltIdx){this._prebuildItems(this._lastPrebuiltIdx,insertionIdx+1);}
 62 var liElem=this._insertAfterItem(refIdx,innerHTML);if(insertionIdx>this.cfg.getProperty("size")){this.cfg.setProperty("size",insertionIdx,true);}
 63 this._enableDisableControls();return liElem;},scrollNext:function(){this._scrollNext(null,this);this._autoPlayTimer=null;if(this.cfg.getProperty("autoPlay")!==0){this._autoPlayTimer=this.startAutoPlay();}},scrollPrev:function(){this._scrollPrev(null,this);},scrollTo:function(newStart){this._position(newStart,true);},moveTo:function(newStart){this._position(newStart,false);},startAutoPlay:function(interval){if(this._isValidObj(interval)){this.cfg.setProperty("autoPlay",interval,true);}
 64 if(this._autoPlayTimer!==null){return this._autoPlayTimer;}
 65 var oThis=this;var autoScroll=function(){oThis.scrollNext();};this._autoPlayTimer=setTimeout(autoScroll,this.cfg.getProperty("autoPlay"));return this._autoPlayTimer;},stopAutoPlay:function(){if(this._autoPlayTimer!==null){clearTimeout(this._autoPlayTimer);this._autoPlayTimer=null;}},isVertical:function(){return(this.cfg.getProperty("orientation")!="horizontal");},isItemLoaded:function(idx){var liElem=this.getItem(idx);if(this._isValidObj(liElem)&&!this._isValidObj(liElem.placeholder)){return true;}
 66 return false;},getItem:function(idx){var elemName=this._carouselElemID+"-item-"+idx;var liElem=YAHOO.util.Dom.get(elemName);return liElem;},show:function(){YAHOO.util.Dom.setStyle(this.carouselElem,"display","block");this.calculateSize();},hide:function(){YAHOO.util.Dom.setStyle(this.carouselElem,"display","none");},calculateSize:function(){var ulKids=this.carouselList.childNodes;var li=null;for(var i=0;i<ulKids.length;i++){li=ulKids[i];if(li.tagName=="LI"||li.tagName=="li"){break;}}
 67 var navMargin=this.cfg.getProperty("navMargin");var numVisible=this.cfg.getProperty("numVisible");var firstVisible=this.cfg.getProperty("firstVisible");var pl=this._getStyleVal(li,"paddingLeft");var pr=this._getStyleVal(li,"paddingRight");var ml=this._getStyleVal(li,"marginLeft");var mr=this._getStyleVal(li,"marginRight");var pt=this._getStyleVal(li,"paddingTop");var pb=this._getStyleVal(li,"paddingBottom");var mt=this._getStyleVal(li,"marginTop");var mb=this._getStyleVal(li,"marginBottom");YAHOO.util.Dom.removeClass(this.carouselList,"carousel-vertical");YAHOO.util.Dom.removeClass(this.carouselList,"carousel-horizontal");if(this.isVertical()){var liPaddingMarginWidth=pl+pr+ml+mr;YAHOO.util.Dom.addClass(this.carouselList,"carousel-vertical");var liPaddingMarginHeight=pt+pb+mt+mb;var upt=this._getStyleVal(this.carouselList,"paddingTop");var upb=this._getStyleVal(this.carouselList,"paddingBottom");var umt=this._getStyleVal(this.carouselList,"marginTop")
 68 var umb=this._getStyleVal(this.carouselList,"marginBottom")
 69 var ulPaddingHeight=upt+upb+umt+umb;var revealAmt=(this._isExtraRevealed())?(this.cfg.getProperty("revealAmount")+(liPaddingMarginHeight)/2):0;var liHeight=this._getStyleVal(li,"height",true);this.scrollAmountPerInc=(liHeight+liPaddingMarginHeight);var liWidth=this._getStyleVal(li,"width");this.carouselElem.style.width=(liWidth+liPaddingMarginWidth)+"px";this._clipReg.style.height=(this.scrollAmountPerInc*numVisible+revealAmt*2+
 70 ulPaddingHeight)+"px";this.carouselElem.style.height=(this.scrollAmountPerInc*numVisible+revealAmt*2+navMargin*2+
 71 ulPaddingHeight)+"px";var revealTop=(this._isExtraRevealed())?(revealAmt-(Math.abs(mt-mb)+Math.abs(pt-pb))/2):0;YAHOO.util.Dom.setStyle(this.carouselList,"position","relative");YAHOO.util.Dom.setStyle(this.carouselList,"top",""+revealTop+"px");var currY=YAHOO.util.Dom.getY(this.carouselList);YAHOO.util.Dom.setY(this.carouselList,currY-this.scrollAmountPerInc*(firstVisible-1));}else{YAHOO.util.Dom.addClass(this.carouselList,"carousel-horizontal");var upl=this._getStyleVal(this.carouselList,"paddingLeft");var upr=this._getStyleVal(this.carouselList,"paddingRight");var uml=this._getStyleVal(this.carouselList,"marginLeft")
 72 var umr=this._getStyleVal(this.carouselList,"marginRight")
 73 var ulPaddingWidth=upl+upr+uml+umr;var liMarginWidth=ml+mr;var liPaddingMarginWidth=liMarginWidth+pr+pl;var revealAmt=(this._isExtraRevealed())?(this.cfg.getProperty("revealAmount")+(liPaddingMarginWidth)/2):0;var liWidth=li.offsetWidth;this.scrollAmountPerInc=liWidth+liMarginWidth;this._clipReg.style.width=(this.scrollAmountPerInc*numVisible+revealAmt*2)+"px";this.carouselElem.style.width=(this.scrollAmountPerInc*numVisible+navMargin*2+revealAmt*2+
 74 ulPaddingWidth)+"px";var revealLeft=(this._isExtraRevealed())?(revealAmt-(Math.abs(mr-ml)+Math.abs(pr-pl))/2-(uml+upl)):0;YAHOO.util.Dom.setStyle(this.carouselList,"position","relative");YAHOO.util.Dom.setStyle(this.carouselList,"left",""+revealLeft+"px");var currX=YAHOO.util.Dom.getX(this.carouselList);YAHOO.util.Dom.setX(this.carouselList,currX-this.scrollAmountPerInc*(firstVisible-1));}},setProperty:function(property,value,silent){this.cfg.setProperty(property,value,silent);},getProperty:function(property){return this.cfg.getProperty(property);},getFirstItemRevealed:function(){return this._firstItemRevealed;},getLastItemRevealed:function(){return this._lastItemRevealed;},getFirstVisible:function(){return this.cfg.getProperty("firstVisible");},getLastVisible:function(){var firstVisible=this.cfg.getProperty("firstVisible");var numVisible=this.cfg.getProperty("numVisible");return firstVisible+numVisible-1;},_getStyleVal:function(li,style,returnFloat){var styleValStr=YAHOO.util.Dom.getStyle(li,style);var styleVal=returnFloat?parseFloat(styleValStr):parseInt(styleValStr,10);if(style=="height"&&isNaN(styleVal)){styleVal=li.offsetHeight;}else if(isNaN(styleVal)){styleVal=0;}
 75 return styleVal;},_calculateSize:function(me){me.calculateSize();me.show();},_removeChildrenFromNode:function(node)
 76 {if(!this._isValidObj(node))
 77 {return;}
 78 var len=node.childNodes.length;while(node.hasChildNodes())
 79 {node.removeChild(node.firstChild);}},_prebuildLiElem:function(idx){if(idx<1)return;var liElem=document.createElement("li");liElem.id=this._carouselElemID+"-item-"+idx;liElem.placeholder=true;this.carouselList.appendChild(liElem);this._lastPrebuiltIdx=(idx>this._lastPrebuiltIdx)?idx:this._lastPrebuiltIdx;},_createItem:function(idx,innerHTMLOrElem){if(idx<1)return;var liElem=document.createElement("li");liElem.id=this._carouselElemID+"-item-"+idx;if(typeof(innerHTMLOrElem)==="string"){liElem.innerHTML=innerHTMLOrElem;}else{liElem.appendChild(innerHTMLOrElem);}
 80 return liElem;},_insertAfterItem:function(refIdx,innerHTMLOrElem){return this._insertBeforeItem(refIdx+1,innerHTMLOrElem);},_insertBeforeItem:function(refIdx,innerHTMLOrElem){var refItem=this.getItem(refIdx);var size=this.cfg.getProperty("size");if(size!=this.UNBOUNDED_SIZE){this.cfg.setProperty("size",size+1,true);}
 81 for(var i=this._lastPrebuiltIdx;i>=refIdx;i--){var anItem=this.getItem(i);if(this._isValidObj(anItem)){anItem.id=this._carouselElemID+"-item-"+(i+1);}}
 82 var liElem=this._createItem(refIdx,innerHTMLOrElem);var insertedItem=this.carouselList.insertBefore(liElem,refItem);this._lastPrebuiltIdx+=1;return liElem;},insertAfterEnd:function(innerHTMLOrElem){return this.insertAfter(this.cfg.getProperty("size"),innerHTMLOrElem);},_position:function(newStart,showAnimation){var currStart=this._priorFirstVisible;if(newStart>currStart){var inc=newStart-currStart;this._scrollNextInc(inc,showAnimation);}else{var dec=currStart-newStart;this._scrollPrevInc(dec,showAnimation);}},_scrollPrev:function(e,carousel){if(e!==null){carousel.stopAutoPlay();}
 83 if(carousel._scrollPrevAnim.isAnimated()){return false;}
 84 carousel._scrollPrevInc(carousel.cfg.getProperty("scrollInc"),(carousel.cfg.getProperty("animationSpeed")!==0));},_scrollNext:function(e,carousel){if(e!==null){carousel.stopAutoPlay();}
 85 if(carousel._scrollNextAnim.isAnimated()){return false;}
 86 carousel._scrollNextInc(carousel.cfg.getProperty("scrollInc"),(carousel.cfg.getProperty("animationSpeed")!==0));},_handleAnimationComplete:function(type,args,argList){var carousel=argList[0];var direction=argList[1];carousel._animationCompleteEvt.fire(direction);},_areAllItemsLoaded:function(first,last){var itemsLoaded=true;for(var i=first;i<=last;i++){var liElem=this.getItem(i);if(!this._isValidObj(liElem)){this._prebuildLiElem(i);itemsLoaded=false;}else if(this._isValidObj(liElem.placeholder)){itemsLoaded=false;}}
 87 return itemsLoaded;},_prebuildItems:function(first,last){for(var i=first;i<=last;i++){var liElem=this.getItem(i);if(!this._isValidObj(liElem)){this._prebuildLiElem(i);}}},_isExtraRevealed:function(){return(this.cfg.getProperty("revealAmount")>0);},_scrollNextInc:function(inc,showAnimation){var numVisible=this.cfg.getProperty("numVisible");var currStart=this._priorFirstVisible;var currEnd=this._priorLastVisible;var size=this.cfg.getProperty("size");var scrollExtent=this._calculateAllowableScrollExtent();if(this.cfg.getProperty("wrap")&&currEnd==scrollExtent.end){this.scrollTo(scrollExtent.start);return;}
 88 var newStart=currStart+inc;var newEnd=newStart+numVisible-1;if(newEnd>scrollExtent.end){newEnd=scrollExtent.end;newStart=newEnd-numVisible+1;}
 89 inc=newStart-currStart;this.cfg.setProperty("firstVisible",newStart,true);if(inc>0){if(this._isValidObj(this.cfg.getProperty("loadNextHandler"))){var visibleExtent=this._calculateVisibleExtent(newStart,newEnd);var cacheStart=(currEnd+1)<visibleExtent.start?(currEnd+1):visibleExtent.start;var alreadyCached=this._areAllItemsLoaded(cacheStart,visibleExtent.end);this._loadNextHandlerEvt.fire(visibleExtent.start,visibleExtent.end,alreadyCached);}
 90 if(showAnimation){var nextParams={points:{by:[-this.scrollAmountPerInc*inc,0]}};if(this.isVertical()){nextParams={points:{by:[0,-this.scrollAmountPerInc*inc]}};}
 91 this._scrollNextAnim=new YAHOO.util.Motion(this.carouselList,nextParams,this.cfg.getProperty("animationSpeed"),this.cfg.getProperty("animationMethod"));if(this.cfg.getProperty("animationCompleteHandler")){this._scrollNextAnim.onComplete.subscribe(this._handleAnimationComplete,[this,"next"]);}
 92 this._scrollNextAnim.animate();}else{if(this.isVertical()){var currY=YAHOO.util.Dom.getY(this.carouselList);YAHOO.util.Dom.setY(this.carouselList,currY-this.scrollAmountPerInc*inc);}else{var currX=YAHOO.util.Dom.getX(this.carouselList);YAHOO.util.Dom.setX(this.carouselList,currX-this.scrollAmountPerInc*inc);}}}
 93 this._priorFirstVisible=newStart;this._priorLastVisible=newEnd;this._enableDisableControls();return false;},_scrollPrevInc:function(dec,showAnimation){var numVisible=this.cfg.getProperty("numVisible");var currStart=this._priorFirstVisible;var currEnd=this._priorLastVisible;var size=this.cfg.getProperty("size");var newStart=currStart-dec;var scrollExtent=this._calculateAllowableScrollExtent();newStart=(newStart<scrollExtent.start)?scrollExtent.start:newStart;var newEnd=newStart+numVisible-1;if(newEnd>scrollExtent.end){newEnd=scrollExtent.end;newStart=newEnd-numVisible+1;}
 94 dec=currStart-newStart;this.cfg.setProperty("firstVisible",newStart,true);if(dec>0){if(this._isValidObj(this.cfg.getProperty("loadPrevHandler"))){var visibleExtent=this._calculateVisibleExtent(newStart,newEnd);var cacheEnd=(currStart-1)>visibleExtent.end?(currStart-1):visibleExtent.end;var alreadyCached=this._areAllItemsLoaded(visibleExtent.start,cacheEnd);this._loadPrevHandlerEvt.fire(visibleExtent.start,visibleExtent.end,alreadyCached);}
 95 if(showAnimation){var prevParams={points:{by:[this.scrollAmountPerInc*dec,0]}};if(this.isVertical()){prevParams={points:{by:[0,this.scrollAmountPerInc*dec]}};}
 96 this._scrollPrevAnim=new YAHOO.util.Motion(this.carouselList,prevParams,this.cfg.getProperty("animationSpeed"),this.cfg.getProperty("animationMethod"));if(this.cfg.getProperty("animationCompleteHandler")){this._scrollPrevAnim.onComplete.subscribe(this._handleAnimationComplete,[this,"prev"]);}
 97 this._scrollPrevAnim.animate();}else{if(this.isVertical()){var currY=YAHOO.util.Dom.getY(this.carouselList);YAHOO.util.Dom.setY(this.carouselList,currY+
 98 this.scrollAmountPerInc*dec);}else{var currX=YAHOO.util.Dom.getX(this.carouselList);YAHOO.util.Dom.setX(this.carouselList,currX+
 99 this.scrollAmountPerInc*dec);}}}
100 this._priorFirstVisible=newStart;this._priorLastVisible=newEnd;this._enableDisableControls();return false;},_enableDisableControls:function(){var firstVisible=this.cfg.getProperty("firstVisible");var lastVisible=this.getLastVisible();var scrollExtent=this._calculateAllowableScrollExtent();if(this._prevEnabled){if(firstVisible===scrollExtent.start){this._disablePrev();}}
101 if(this._prevEnabled===false){if(firstVisible>scrollExtent.start){this._enablePrev();}}
102 if(this._nextEnabled){if(lastVisible===scrollExtent.end){this._disableNext();}}
103 if(this._nextEnabled===false){if(lastVisible<scrollExtent.end){this._enableNext();}}},_loadInitial:function(){var firstVisible=this.cfg.getProperty("firstVisible");this._priorLastVisible=this.getLastVisible();if(this._loadInitHandlerEvt){var visibleExtent=this._calculateVisibleExtent(firstVisible,this._priorLastVisible);var alreadyCached=this._areAllItemsLoaded(1,visibleExtent.end);this._loadInitHandlerEvt.fire(visibleExtent.start,visibleExtent.end,alreadyCached);}
104 if(this.cfg.getProperty("autoPlay")!==0){this._autoPlayTimer=this.startAutoPlay();}
105 this._enableDisableControls();},_calculateAllowableScrollExtent:function(){var scrollBeforeAmount=this.cfg.getProperty("scrollBeforeAmount");var scrollAfterAmount=this.cfg.getProperty("scrollAfterAmount");var size=this.cfg.getProperty("size");var extent={start:1-scrollBeforeAmount,end:size+scrollAfterAmount};return extent;},_calculateVisibleExtent:function(start,end){if(!start){start=this.cfg.getProperty("firstVisible");end=this.getLastVisible();}
106 var size=this.cfg.getProperty("size");start=start<1?1:start;end=end>size?size:end;var extent={start:start,end:end};this._firstItemRevealed=-1;this._lastItemRevealed=-1;if(this._isExtraRevealed()){if(start>1){this._firstItemRevealed=start-1;extent.start=this._firstItemRevealed;}
107 if(end<size){this._lastItemRevealed=end+1;extent.end=this._lastItemRevealed;}}
108 return extent;},_disablePrev:function(){this._prevEnabled=false;if(this._prevButtonStateHandlerEvt){this._prevButtonStateHandlerEvt.fire(false,this._carouselPrev);}
109 if(this._isValidObj(this._carouselPrev)){YAHOO.util.Event.removeListener(this._carouselPrev,"click",this._scrollPrev);}},_enablePrev:function(){this._prevEnabled=true;if(this._prevButtonStateHandlerEvt){this._prevButtonStateHandlerEvt.fire(true,this._carouselPrev);}
110 if(this._isValidObj(this._carouselPrev)){YAHOO.util.Event.addListener(this._carouselPrev,"click",this._scrollPrev,this);}},_disableNext:function(){if(this.cfg.getProperty("wrap")){return;}
111 this._nextEnabled=false;if(this._isValidObj(this._nextButtonStateHandlerEvt)){this._nextButtonStateHandlerEvt.fire(false,this._carouselNext);}
112 if(this._isValidObj(this._carouselNext)){YAHOO.util.Event.removeListener(this._carouselNext,"click",this._scrollNext);}},_enableNext:function(){this._nextEnabled=true;if(this._isValidObj(this._nextButtonStateHandlerEvt)){this._nextButtonStateHandlerEvt.fire(true,this._carouselNext);}
113 if(this._isValidObj(this._carouselNext)){YAHOO.util.Event.addListener(this._carouselNext,"click",this._scrollNext,this);}},_isValidObj:function(obj){if(null==obj){return false;}
114 if("undefined"==typeof(obj)){return false;}
115 return true;}};