(function(){var Event=YAHOO.util.Event,Dom=YAHOO.util.Dom,Lang=YAHOO.lang,UA=YAHOO.env.ua,CarouselPrototype=YAHOO.widget.Carousel.prototype,fnCarouselInitAttributes=CarouselPrototype.initAttributes,m_oToolbarButtons={},m_oCurrentButtonIndex={},m_bUseARIA=(UA.gecko&&UA.gecko>=1.9)||(UA.ie&&UA.ie>=8),m_aFocusableElements={"A":true,"SELECT":true,"TEXTAREA":true,"BUTTON":true,"INPUT":true},_USE_ARIA="usearia",_ARIA_PREFIX="aria-",_HIDDEN="hidden",_ASTERIX="*",_ID="id",_ROLE="role",_OPTION="option",_LISTBOX="listbox",_LI="li",_SELECTED_ITEM="selectedItem",_SELECTED="selected",_TOOLBAR="toolbar",_KEY_DOWN="keydown",_PRESENTATION="presentation",_BUTTON="button",_HREF="href",_UL="UL",_A="A",_RENDER="render",_SELECTED_ITEM_CHANGE="selectedItemChange",_SHOW="show",_PAGE_CHANGE="pageChange",_KEY_PRESS="keypress",_CONTROLS="controls",_LABELLED_BY="labelledby",_DESCRIBED_BY="describedby",_CURRENT_PAGE=" (Current Page)";var setARIARole=function(element,role){element.setAttribute(_ROLE,role);};var setARIAProperty=function(element,property,value){element.setAttribute((_ARIA_PREFIX+property),value);};var getCarouselListElement=function(){var aCarouselEl=this.getElementsByClassName(this.CLASSES.CAROUSEL_EL);if(aCarouselEl.length===1){return aCarouselEl[0];}};var getCarouselNavElement=function(){var aNavigationEl=this.getElementsByClassName(this.CLASSES.NAVIGATION);if(aNavigationEl.length===1){return aNavigationEl[0];}};var isFocusableElement=function(element){return((element.tabIndex>-1||m_aFocusableElements[element.nodeName.toUpperCase()])&&element.type!==_HIDDEN&&!element.disabled);};var addToTabIndex=function(element){element.tabIndex=0;};var removeFromTabIndex=function(element){element.tabIndex=-1;};var enableCarouselItem=function(index){var oItem=this.getItem(index);if(oItem){Dom.getElementsBy(isFocusableElement,_ASTERIX,oItem.id,addToTabIndex);}};var disableCarouselItem=function(index){var oItem=this.getItem(index);if(oItem){Dom.getElementsBy(isFocusableElement,_ASTERIX,oItem.id,removeFromTabIndex);}};var onSelectedItemChange=function(event){var nPreviousItemIndex=event.prevValue;if(Lang.isNumber(nPreviousItemIndex)){disableCarouselItem.call(this,nPreviousItemIndex);}
enableCarouselItem.call(this,event.newValue);setARIAProperty(this.getElementForItem(event.newValue),_SELECTED,true);};var onKeyDown=function(event){Event.stopPropagation(event);var sId=this.get(_ID),aToolBarButtons=m_oToolbarButtons[sId],nCurrentButtonIndex=m_oCurrentButtonIndex[sId],oNextButton,oCurrentButton;switch(Event.getCharCode(event)){case 0x25:case 0x26:oCurrentButton=aToolBarButtons[nCurrentButtonIndex];oCurrentButton.tabIndex=-1;nCurrentButtonIndex=nCurrentButtonIndex-1;oNextButton=aToolBarButtons[nCurrentButtonIndex];if(!oNextButton){nCurrentButtonIndex=aToolBarButtons.length-1;oNextButton=aToolBarButtons[nCurrentButtonIndex];}
m_oCurrentButtonIndex[sId]=nCurrentButtonIndex;oNextButton.tabIndex=0;oNextButton.focus();break;case 0x27:case 0x28:oCurrentButton=aToolBarButtons[nCurrentButtonIndex];oCurrentButton.tabIndex=-1;nCurrentButtonIndex=nCurrentButtonIndex+1;oNextButton=aToolBarButtons[nCurrentButtonIndex];if(!oNextButton){nCurrentButtonIndex=0;oNextButton=aToolBarButtons[nCurrentButtonIndex];}
m_oCurrentButtonIndex[sId]=nCurrentButtonIndex;oNextButton.tabIndex=0;oNextButton.focus();break;}};var addOptionRole=function(element){setARIARole(element,_OPTION);Dom.getElementsBy(isFocusableElement,_ASTERIX,element,removeFromTabIndex);};var onRender=function(){var oList=getCarouselListElement.call(this),nSelectedItemIndex,oNavigation;if(oList){setARIARole(oList,_LISTBOX);Dom.batch(oList.getElementsByTagName(_LI),addOptionRole);nSelectedItemIndex=this.get(_SELECTED_ITEM);if(Lang.isNumber(nSelectedItemIndex)){setARIAProperty(this.getElementForItem(nSelectedItemIndex),_SELECTED,true);enableCarouselItem.call(this,nSelectedItemIndex);}
oNavigation=getCarouselNavElement.call(this);if(oNavigation){setARIARole(oNavigation,_TOOLBAR);Event.on(oNavigation,_KEY_DOWN,onKeyDown,null,this);}}};var setupPageButton=function(element,object){var oCarousel=object.carousel,aToolBarButtons=object.toolbarButtons;setARIARole(element,_PRESENTATION);var oAnchor=Dom.getFirstChild(element);setARIARole(oAnchor,_BUTTON);setARIAProperty(oAnchor,_CONTROLS,object.listID);oAnchor.value=oAnchor.getAttribute(_HREF,2);oAnchor.removeAttribute(_HREF);var nTabIndex=Dom.hasClass(element,oCarousel.CLASSES.SELECTED_NAV)?0:-1;oAnchor.tabIndex=nTabIndex;var nToolBarIndex=aToolBarButtons.length;var oEM=Dom.getFirstChild(oAnchor);if(nTabIndex===0){m_oCurrentButtonIndex[oCarousel.get(_ID)]=nToolBarIndex;oEM.innerHTML=oEM.innerHTML+_CURRENT_PAGE;}
aToolBarButtons[nToolBarIndex]=oAnchor;};var setupNextPrevPageButton=function(element,object){var aToolbarButtons=object.toolbarButtons;setARIARole(element,_PRESENTATION);setARIAProperty(element,_CONTROLS,object.listID);var oInput=Dom.getFirstChild(element);if(!oInput.disabled){oInput.tabIndex=-1;aToolbarButtons[aToolbarButtons.length]=oInput;}};var updatePagingNav=function(event){var oNavigation=getCarouselNavElement.call(this),aToolBarButtons=[],nCurrentButtonIndex,oFirstChild,oList,sListID;if(oNavigation){oFirstChild=Dom.getFirstChild(oNavigation);oList=getCarouselListElement.call(this);if(oFirstChild&&oList){sListID=oList.id||Dom.generatId(oList);if(oFirstChild.nodeName.toUpperCase()===_UL){setARIARole(oFirstChild,_PRESENTATION);Dom.batch(oFirstChild.getElementsByTagName(_LI),setupPageButton,{carousel:this,toolbarButtons:aToolBarButtons,listID:sListID});}
else{oFirstChild.tabIndex=0;setARIAProperty(oFirstChild,_CONTROLS,sListID);}
Dom.batch(this.getElementsByClassName(this.CLASSES.BUTTON),setupNextPrevPageButton,{toolbarButtons:aToolBarButtons,listID:sListID});m_oToolbarButtons[this.get(_ID)]=aToolBarButtons;}}};var onPageChange=function(){Lang.later(0,this,updatePagingNav);};var onKeyPress=function(event){var oTarget=Event.getTarget(event),nCharCode=Event.getCharCode(event);if(oTarget.nodeName.toUpperCase()===_A&&Dom.getAncestorByClassName(oTarget,this.CLASSES.NAVIGATION)&&(nCharCode===13||nCharCode===32)){this._pagerClickHandler(event);}};var setLabelledByOnRender=function(event,id){this.set(_LABELLED_BY,id,true);this.removeListener(_RENDER,setLabelledByOnRender);};var setDescribedByOnRender=function(event,id){this.set(_DESCRIBED_BY,id,true);this.removeListener(_RENDER,setDescribedByOnRender);};Lang.augmentObject(CarouselPrototype,{_setLabelledBy:function(id){var oNav=getCarouselNavElement.call(this),oList=getCarouselListElement.call(this);if(this.get(_USE_ARIA)&&oNav&&oList){setARIAProperty(oNav,_LABELLED_BY,id);setARIAProperty(oList,_LABELLED_BY,id);}
else{this.on(_RENDER,setLabelledByOnRender,id);}},_setDescribedBy:function(id){var oNav=getCarouselNavElement.call(this),oList=getCarouselListElement.call(this);if(this.get(_USE_ARIA)&&oNav&&oList){setARIAProperty(oNav,_DESCRIBED_BY,id);setARIAProperty(oList,_DESCRIBED_BY,id);}
else{this.on(_RENDER,setDescribedByOnRender,id);}},_setUseARIA:function(p_bUseARIA){if(p_bUseARIA){this.on(_RENDER,onRender);this.on(_SELECTED_ITEM_CHANGE,onSelectedItemChange);this.on(_SHOW,updatePagingNav);this.on(_PAGE_CHANGE,onPageChange);this.on(_KEY_PRESS,onKeyPress);}},initAttributes:function(p_oAttributes){this.setAttributeConfig(_USE_ARIA,{value:p_oAttributes.usearia||m_bUseARIA,validator:Lang.isBoolean,writeOnce:true,method:this._setUseARIA});this.setAttributeConfig(_LABELLED_BY,{value:p_oAttributes.labelledby,validator:Lang.isString,method:this._setLabelledBy});this.setAttributeConfig(_DESCRIBED_BY,{value:p_oAttributes.describedby,validator:Lang.isString,method:this._setDescribedBy});fnCarouselInitAttributes.apply(this,arguments);if(m_bUseARIA){this.set(_USE_ARIA,true);}}},"initAttributes","_setUseARIA","_setLabelledBy","_setDescribedBy");}());