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	<title>Understanding Flex itemRenderers &#8211; Part 3: Communication | Adobe Developer Connection</title><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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                    <br style="clear: both" />
            
                    <div class="SiteHeaderRow">
                        <ul class="SiteHeaderRightLink">
                            <li class="SiteHeaderPanelLink"><a href="/products/catalog.html?promoid=JOOTH" id="Products_Seeallproducts">See all products</a></li>
                        </ul>
                    </div>
                </div>
            </div>
            <div class="SiteHeaderDropdownLink SiteHeaderBarItem" id="shBusinessSolutions">
                <a href="/solutions.html?promoid=KAWQJ" id="shBusinessSolutionsLink" class="SiteHeaderBarLink">Business solutions</a>
                <div class="SiteHeaderDropPanel SiteHeaderDropdown-Double" id="BusinessSolutionsPanel">
                    <div class="SiteHeaderRow">
                        <div class="SiteHeaderColumn-1">
                            <p class="SiteHeaderPanelHeaderSmall">By business need</p>
                            <ul>
                                <li class="SiteHeaderPanelLink"><a href="/solutions/digital-analytics.html?promoid=JOLJB" id="BusinessSolutions_Bybusinessneed_Digitalanalytics">Digital analytics</a></li>
                                <li class="SiteHeaderPanelLink"><a href="/solutions/digital-publishing.html?promoid=JOLJA" id="BusinessSolutions_Bybusinessneed_Digitalpublishing">Digital publishing</a></li>
                                <li class="SiteHeaderPanelLink"><a href="/products/acrobat.html?promoid=KAWSC" id="BusinessSolutions_Bybusinessneed_Documentmanagement">Document management</a></li>
                                <li class="SiteHeaderPanelLink"><a href="/solutions/media-optimization.html?promoid=JOLIX" id="BusinessSolutions_Bybusinessneed_Mediaoptimization">Media optimization</a></li>
                                <li class="SiteHeaderPanelLink"><a href="/solutions/social-marketing.html?promoid=JZPNO" id="BusinessSolutions_Bybusinessneed_Socialmarketing">Social marketing</a></li>
                                <li class="SiteHeaderPanelLink"><a href="/solutions/testing-targeting.html?promoid=KAXLU" id="BusinessSolutions_Bybusinessneed_Testingandtargeting">Testing and targeting</a></li>
                                <li class="SiteHeaderPanelLink"><a href="/products/creativecloud/video.html?promoid=KAUDD" id="BusinessSolutions_Bybusinessneed_Videoeditingandserving">Video editing and serving</a></li>
                                <li class="SiteHeaderPanelLink"><a href="http://html.adobe.com?promoid=JZEFF" target="_blank" class="SiteHeaderLinkNewWindow" id="BusinessSolutions_Bybusinessneed_Webdevelopment">Web <span class="SiteHeaderIconNewWindowNoWrap">development<span class="SiteHeaderIconNewWindow"> [opens in a new window]</span></span></a></li>
                                <li class="SiteHeaderPanelLink"><a href="/solutions/web-experience-management.html?promoid=JOOYM" id="BusinessSolutions_Bybusinessneed_Webexperiencemanagement">Web experience management</a></li>
                            </ul>
            
                            <ul class="SiteHeaderPanelLinkNoBottom">
                                <li class="SiteHeaderPanelLink"><a href="/solutions.html?promoid=JOOTI" id="BusinessSolutions_Seeallbusinessneeds">See all business needs</a></li>
                            </ul>
                         </div>
            
                        <div class="SiteHeaderColumn-2">
                            <p class="SiteHeaderPanelHeaderSmall">By industry</p>
                            <ul>
                                <li class="SiteHeaderPanelLink"><a href="/solutions/broadcasting.html?promoid=JOLIY" id="BusinessSolutions_Byindustry_Broadcast">Broadcast</a></li>
                                <li class="SiteHeaderPanelLink"><a href="/education.html?marketSegment=EDU&promoid=JOLIZ" id="BusinessSolutions_Byindustry_Education">Education</a></li>
                                <li class="SiteHeaderPanelLink"><a href="/solutions/financial-services.html?promoid=KAUDE" id="BusinessSolutions_Byindustry_Financialservices">Financial services</a></li>
                                <li class="SiteHeaderPanelLink"><a href="/solutions/government.html?promoid=KAUDF" id="BusinessSolutions_Byindustry_Government">Government</a></li>
                                <li class="SiteHeaderPanelLink"><a href="/solutions/digital-publishing.html?promoid=KAUDG" id="BusinessSolutions_Byindustry_Publishing">Publishing</a></li>
                                <li class="SiteHeaderPanelLink"><a href="/solutions/retail.html?promoid=KAWSD" id="BusinessSolutions_Byindustry_Retail">Retail</a></li>
                            </ul>
            
                            <ul class="SiteHeaderPanelLinkNoBottom">
                                <li class="SiteHeaderPanelLink"><a href="/solutions.html?promoid=KAUDH" id="BusinessSolutions_Seeallindustries">See all industries</a></li>
                            </ul>
                        </div>
                    </div>
                </div>
            </div>
            <div class="SiteHeaderDropdownLink SiteHeaderBarItem" id="shSupportLearning">
                <a href="http://helpx.adobe.com/support/?promoid=KAWQK" id="shSupportLearningLink" class="SiteHeaderBarLink">Support &amp; Learning</a>
                <div class="SiteHeaderDropPanel SiteHeaderDropdown-Single" id="SupportLearningPanel">
                    <div class="SiteHeaderRow">
                        <p class="SiteHeaderPanelHeaderSmall">I need help</p>
                        <ul>
                            <li class="SiteHeaderPanelLink"><a href="http://helpx.adobe.com/support/?promoid=JZEFP" id="SupportLearning_Ineedhelp_Products">Products</a></li>
                            <li class="SiteHeaderPanelLink"><a href="http://helpx.adobe.com/creative-cloud/topics/getting-started.html?promoid=JZEFO" id="SupportLearning_Ineedhelp_AdobeCreativeCloud">Adobe Creative Cloud</a></li>
                            <li class="SiteHeaderPanelLink"><a href="http://helpx.adobe.com/marketing-cloud.html?promoid=KAWSE" id="SupportLearning_Ineedhelp_AdobeMarketingCloud">Adobe Marketing Cloud</a></li>
                            <li class="SiteHeaderPanelLink"><a href="http://forums.adobe.com/index.jspa?promoid=JZEFM" target="_blank" id="SupportLearning_Ineedhelp_Forums"><span class="SiteHeaderIconNewWindowNoWrap">Forums<span class="SiteHeaderIconNewWindow"> [opens in a new window]</span></span></a></li>
                        </ul>
            
                        <p class="SiteHeaderPanelHeaderSmall">I want to learn</p>
                        <ul class="SiteHeaderPanelLinkNoBottom">
                            <li class="SiteHeaderPanelLink"><a href="http://helpx.adobe.com/learning.html?promoid=KAUDK" id="SupportLearning_Iwanttolearn_Trainingandtutorials">Training and tutorials</a></li>
                            <li class="SiteHeaderPanelLink"><a href="http://training.adobe.com/certification.html?promoid=KAUDM" target="_blank" id="SupportLearning_Iwanttolearn_Certification"><span class="SiteHeaderIconNewWindowNoWrap">Certification<span class="SiteHeaderIconNewWindow"> [opens in a new window]</span></span></a></li>
                            <li class="SiteHeaderPanelLink"><a href="/devnet.html?promoid=KAUDN" id="SupportLearning_Iwanttolearn_AdobeDeveloperConnection">Adobe Developer Connection</a></li>
                            <li class="SiteHeaderPanelLink"><a href="/designcenter.html?promoid=KAUDO" id="SupportLearning_Iwanttolearn_AdobeDesignCenter">Adobe Design Center</a></li>
                            <li class="SiteHeaderPanelLink"><a href="http://tv.adobe.com?promoid=KFELF" target="_blank" id="SupportLearning_Iwanttolearn_AdobeTV">Adobe <span class="SiteHeaderIconNewWindowNoWrap">TV<span class="SiteHeaderIconNewWindow"> [opens in a new window]</span></span></a></li>
                            <li class="SiteHeaderPanelLink"><a href="/solutions/digital-marketing/guides.html?promoid=KAWSF" id="SupportLearning_Iwanttolearn_AdobeMarketingCenter">Adobe Marketing Center</a></li>
                            <li class="SiteHeaderPanelLink"><a href="http://labs.adobe.com/?promoid=JZEFQ" target="_blank" id="SupportLearning_Iwanttolearn_AdobeLabs">Adobe <span class="SiteHeaderIconNewWindowNoWrap">Labs<span class="SiteHeaderIconNewWindow"> [opens in a new window]</span></span></a></li>
                        </ul>
                    </div>
                </div>
            </div>
            <div class="SiteHeaderDropdownLink SiteHeaderBarItem" id="shDownload">
                <a href="/downloads/?promoid=KAWQL" id="shDownloadLink" class="SiteHeaderBarLink">Download</a>
                <div class="SiteHeaderDropPanel SiteHeaderDropdown-Single" id="DownloadPanel">
                    <div class="SiteHeaderRow">
                        <ul>
                            <li class="SiteHeaderPanelLink"><a href="/downloads/?promoid=JZEFS" id="Download_Producttrials">Product trials</a></li>
                            <li class="SiteHeaderPanelLink"><a href="http://get.adobe.com/flashplayer/?promoid=JZEFT" id="Download_AdobeFlashPlayer">Adobe Flash Player</a></li>
                            <li class="SiteHeaderPanelLink"><a href="http://get.adobe.com/reader/?promoid=JZEFU" id="Download_AdobeReader">Adobe Reader</a></li>
                            <li class="SiteHeaderPanelLink"><a href="http://get.adobe.com/air/?promoid=JZEFV" id="Download_AdobeAIR">Adobe AIR</a></li>
                        </ul>
            
                        <ul class="SiteHeaderPanelLinkNoBottom">
                            <li class="SiteHeaderPanelLink"><a href="/downloads/?promoid=JZEFW" id="Download_Seealldownloads">See all downloads</a></li>
                        </ul>
                    </div>
                </div>
            </div>
            <div class="SiteHeaderDropdownLink SiteHeaderBarItem" id="shCompany">
                <a href="/company.html?promoid=KAWQM" id="shCompanyLink" class="SiteHeaderBarLink">Company</a>
                <div class="SiteHeaderDropPanel SiteHeaderDropdown-Single" id="CompanyPanel">
                    <div class="SiteHeaderRow">
                        <ul>
                            <li class="SiteHeaderPanelLink"><a href="/careers.html?promoid=JZEFX" id="Company_CareersatAdobe">Careers at Adobe</a></li>
                            <li class="SiteHeaderPanelLink"><a href="/aboutadobe/invrelations/?promoid=JZEFZ" id="Company_InvestorRelations">Investor Relations</a></li>
                            <li class="SiteHeaderPanelLink"><a href="/aboutadobe/pressroom/?promoid=JZEGA" id="Company_Newsroom">Newsroom</a></li>
                            <li class="SiteHeaderPanelLink"><a href="/privacy.html?promoid=JZEGB" id="Company_Privacy">Privacy</a></li>
                            <li class="SiteHeaderPanelLink"><a href="/corporate-responsibility.html?promoid=JZEFY" id="Company_CorporateResponsibility">Corporate Responsibility</a></li>
                            <li class="SiteHeaderPanelLink"><a href="/customershowcase.html?promoid=KEWBG" id="Company_CustomerShowcase">Customer Showcase</a></li>
                            <li class="SiteHeaderPanelLink"><a href="/company/contact.html?promoid=JZEGC" id="Company_Contactus">Contact us</a></li>
                        </ul>
            
                        <ul class="SiteHeaderPanelLinkNoBottom">
                            <li class="SiteHeaderPanelLink"><a href="/company.html?promoid=JZPLK" id="Company_Morecompanyinfo">More company info</a></li>
                        </ul>
                    </div>
                </div>
            </div>
            <div class="SiteHeaderDropdownLink SiteHeaderBarItem" id="shBuy">
                <a href="/products/catalog/software._sl_id-contentfilter_sl_catalog_sl_software_sl_mostpopular.html?promoid=KAWQN" id="shBuyLink" class="SiteHeaderBarLink">Buy</a>
                <div class="SiteHeaderDropPanel SiteHeaderDropdown-Single" id="BuyPanel">
                    <div class="SiteHeaderRow">
                        <ul class="SiteHeaderPanelLinkNoBottom">
                            <li class="SiteHeaderPanelLink"><a href="/products/catalog/software.html?marketSegment=COM&promoid=KAWQO" id="Buy_Forpersonalandprofessionaluse">For personal and professional use</a></li>
                            <li class="SiteHeaderPanelLink"><a href="/products/catalog/software._sl_id-contentfilter_sl_catalog_sl_education_sl_alledu.html?marketSegment=EDU&promoid=KAWQP" id="Buy_Forstudentseducatorsandstaff">For students, educators, and staff</a></li>
                            <li class="SiteHeaderPanelLink"><a href="/products/small-business-pricing/software-catalog._sl_id-contentfilter_sl_catalog_sl_software_sl_creativecloudmembership.html?marketSegment=COM&promoid=JOLJE" id="Buy_Forsmallandmediumbusinesses">For small and medium businesses</a></li>
                            <li class="SiteHeaderPanelLink"><a href="/volume-licensing.html?promoid=KAWQQ" id="Buy_VolumeLicensing">Volume Licensing</a></li>
                            <li class="SiteHeaderPanelLink"><a href="/products/discount-software-coupons.html?promoid=KAWQR" id="Buy_Specialoffers">Special offers</a></li>
                            <li class="SiteHeaderPanelLink"><a href="http://success.adobe.com/en/na/programs/rfi/dm_sales_inquiries.html?promoid=KAWSG" target="_blank" id="Buy_AdobeMarketingCloudsales">Adobe Marketing Cloud <span class="SiteHeaderIconNewWindowNoWrap">sales<span class="SiteHeaderIconNewWindow"> [opens in a new window]</span></span></a></li>
                        </ul>
                    </div>
                </div>
            </div>

			<!--
            <div id="tooltipStrings" class="SiteHeaderTooltipStrings LayoutHidden">
                <span id="tooltipStringExpandMenu">Expand menu</span>
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            <a href="/go/gnav_search" id="shSearchButton" class="SiteHeaderBarItem SiteHeaderSearchButton" style="display: none;">Search</a>
            <div class="SiteHeaderBarItem SiteHeaderBarItemLast">&nbsp;</div>
            <div id="site-search" class="SiteHeaderSearch">
                <input title="Search" type="text" id="search-input" name="term" maxlength="1000" />
                <input type="hidden" id="searchbuddy-loc" name="loc" value="en_us" />
                <button type="submit" id="search-submit" class="icon-replace search">Search</button>
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        </div>
        <div class="SiteHeaderUser">
            <div id="shSignInBlock">
                <a id="shInfo" class="SiteHeaderUserItem SiteHeaderInfo">Info</a>
                <a href="/account/sign-in.adobedotcom.html" id="shSignIn" class="SiteHeaderUserItem LinkStrong">Sign in</a>
                <div class="SiteHeaderPopPanelShadow width-250" id="InfoPanelShadow" style="display: none;"></div>
                <div class="SiteHeaderPopPanel width-250" id="InfoPanel" style="display: none;">
                    <div class="SiteHeaderPanelRow">
                        <span class="SiteHeaderPanelHeader">Why sign in?</span>
                        Sign in to manage your account and access trial downloads, product extensions, community areas, and more.
                    </div>
                </div>
            </div>
        
            <a href="/account.html" id="shWelcome" class="SiteHeaderUserItem SiteHeaderArrow LinkStrong" style="display: none;">Welcome, <span id="screenName"></span></a>
        
            <div class="SiteHeaderPopPanelShadow" id="WelcomePanelShadow" style="display: none;"></div>
            <div class="SiteHeaderPopPanel" id="WelcomePanel" style="display: none;">
                <div class="SiteHeaderPanelRow SiteHeaderPanelLink" id="shMyAccount">
                    <a class="SiteHeaderPanelHeader" href="/go/gnavtray_myadobe_en_us">My Adobe</a>
                </div>
                <div class="SiteHeaderPanelRow SiteHeaderPanelLink" id="shMyOrders">
                    <a class="SiteHeaderPanelHeader" href="/go/gnavtray_myadobe_myorders_en_us">My orders</a>
                </div>
                <div class="SiteHeaderPanelRow SiteHeaderPanelLink" id="shMyInformation">
                    <a class="SiteHeaderPanelHeader" href="/go/gnavtray_myadobe_myinformation_en_us">My information</a>
                </div>
                <div class="SiteHeaderPanelRow SiteHeaderPanelLink" id="shMyPreferences">
                    <a class="SiteHeaderPanelHeader" href="/go/gnavtray_myadobe_mypreferences_en_us">My preferences</a>
                </div>
                <div class="SiteHeaderPanelRow SiteHeaderPanelLink" id="shMyProductsServices">
                    <a class="SiteHeaderPanelHeader" href="/go/gnavtray_myadobe_myproducts_services_en_us">My products and services</a>
                </div>
                <div class="SiteHeaderPanelRow SiteHeaderPanelLink" id="shSignOut">
                    <a class="SiteHeaderPanelHeader" id="shSignOutLink" href="/cfusion/membership/logout.cfm">Sign out</a>
                </div>
            </div>
        
            <div id="MyCartLinkContainer">
                <a href="/go/gnav_mycart_en_us" id="shMyCart" class="SiteHeaderUserItem SiteHeaderCart">My cart<span id="cartQuantity"></span></a>
            </div>
        
            <a href="/privacy.html" id="shPrivacy" class="SiteHeaderUserItem">Privacy</a>
            <a href="/go/gnav_myadobe_en_us" id="shMyAdobe" class="SiteHeaderUserItem">My Adobe</a>
        </div>
    </div>
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<div id="SiteHeaderMobile" class="SiteHeaderMobile LayoutHidden LayoutSlim Text TextSmall">
    <a href="/go/gnav_adobe_logo_en_us" id="shHomeMobile" class="SiteHeaderHome SiteHeaderHomeMobile">Adobe</a>

    <div class="SiteHeaderBar SiteHeaderBarMobile" id="shBarMobile">
        <span class="SiteHeaderBarItemMobile SiteHeaderBarItemMobileNoLeftBorder" id="shProductsMobileSpan"><a href="/go/gnav_products_en_us" id="shProductsMobile" class="SiteHeaderBarLink">Products</a></span>
        <span class="SiteHeaderBarItemMobile" id="shSectionsMobileSpan"><a href="#" id="shSectionsMobile" class="SiteHeaderArrowMobile SiteHeaderBarLink">Sections</a></span>
        <span class="SiteHeaderBarItemMobile" id="shSectionsMobileBuy"><a href="/go/gnav_store_en_us" id="shBuyMobile" class="SiteHeaderBarLink">Buy</a></span>
        <span class="SiteHeaderBarItemMobile SiteHeaderBarItemMobileNoRightBorder SiteHeaderBarItemMobileNoPadding">&nbsp;</span>
        <span class="SiteHeaderBarItemMobile SiteHeaderBarItemMobileNoRightBorder SiteHeaderBarItemFloatRight" id="shSearchMobileSpan"><a href="/go/gnav_search" id="shSearchMobile" class="SiteHeaderSearchButtonMobile">Search</a></span>
        <span class="SiteHeaderBarItemMobile SiteHeaderBarItemMobileNoLeftBorder SiteHeaderBarItemFloatRight SiteHeaderBarItemMobileNoPadding">&nbsp;</span>
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    <div class="SiteHeaderBarMobileExtend" id="shBarExtend">
        <div id="shBarExtendSections" style="display: none;">
            <div id="shBarExtendSections1" class="SiteHeaderBarMobileExtendSections">
                <a href="/go/gnav_solutions_en_us" id="shSectionsSolutionsMobile" class="SiteHeaderBarExtendSectionsItem SiteHeaderBarLink">Solutions</a>
                <a href="/go/gnav_company_en_us" id="shSectionsCompanyMobile" class="SiteHeaderBarExtendSectionsItem SiteHeaderBarLink">Company</a>
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            <div id="shBarExtendSections2" class="SiteHeaderBarMobileExtendSections">
                <a href="/go/gnav_help_en_us" id="shSectionsHelpMobile" class="SiteHeaderBarExtendSectionsItem SiteHeaderBarLink">Help</a>
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        </div>
        <div id="shBarExtendSearch" style="display: none;">
            <form id="globalnav-search-mobile" class="SiteHeaderSearchMobileForm" name="globalnav-search-mobile" method="get" action="/go/gnav_search" accept-charset="utf-8">
                <input title="Search" type="text" id="search-input-mobile" name="term" maxlength="1000" />
                <button type="submit" id="search-submit-mobile">Search</button>
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    </div>
    <div class="SiteHeaderUser">
        <a href="/cfusion/membership/index.cfm?loc=en_us&amp;nl=1" id="shSignInMobile" class="SiteHeaderUserItem SiteHeaderUserItemMobile LinkStrong">Sign in</a>
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        <a href="/privacy.html" id="shPrivacyMobile" class="SiteHeaderUserItem SiteHeaderUserItemMobile">Privacy</a>
        <a href="/go/gnav_myadobe_en_us" id="shMyAdobeMobile" class="SiteHeaderUserItem SiteHeaderUserItemMobile">My Adobe</a>
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</div>
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					<div class="HoverCart-1 LayoutHItem">
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							<div style="float:left;width:100%" class="CPodCostCell">
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                                <span id="HoverCartPreOrderHardGoodMsgxyz" style="display:none;" class="TextWarning TextPostScript">Preorder Estimated Availability <span id="HoverCartPreOrderHardGoodMsgDatexyz">Date</span>. Your credit card will not be charged until the product is shipped. Estimated availability date is subject to change.</span>
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				<div class="HoverCartEDUMessage LayoutBigCellBottom" style="display:none">Purchase requires verification of academic eligibility</div>
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                    <tr id="HoverCartVATRow">
                        <td>
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                        <td>
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                    <tr>
                        <td>
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                        <td>
                            <div class="LayoutRight TextRight">
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				<div class="LayoutBreak"></div>		
				
				<div class="HoverCart-1-3 LayoutRight LayoutCellTop LayoutBreakAfter">
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		</div>
	</div>
<script>
	/*global jQuery,adobe*/
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		DisplayTime: "5000",

		MoreItemsTextSingular: "() more item in your cart",

		MoreItemsTextPlural: "() more items in your cart",

		MonthToMonthText: "per month",

		YearlyText: "per year"
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	Adobe.Cart.ShoppingCart.GlobalVars = {
			
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		MarketSegment: 			"COM",

		AkamaiURLPrefix: 		"http://wwwimages.adobe.com/www.adobe.com",

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		SubYearText:			"Annual",

		SubscriptionItemText:	"NONE",

		TermTypeMonth:			"MONTH",

		TermTypeYear:			"YEAR",

		BackupDVDParent:		"_PARENT",
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				type,
				taxCode,
				delimiter,
				showCentDelim,
				distributionMethod
			}
		*/
		getPriceLabel: function(params) {
			var currency = params.cart.currency;
			var params = {
				storeName: params.storeName,
				locale: params.locale,
				productKey: params.categoryPath,
				priceObject: {
					price: {
						orginalPriceWithoutTax: params.originalPrice,
						priceWithoutTax: params.price,
						taxCode: params.taxCode || ""
					},
					priceTypeKey: params.distributionMethod
				},
				currencyObject: {
					delimiter: params.delimiter || ",",
					formatString: currency.FORMATSTRING,
					iso3Code: currency.CODE,
					symbol: currency.SYMBOL,
					usePrecision: params.usePrecision
				},
				showCentDelim : params.showCentDelim || false,
				type: params.type
			};
			return params;
		},

		isSubscription: function(serviceCommitment, termType) {
			return (serviceCommitment == this.SubscriptionItemText && 
					(termType == this.TermTypeMonth || termType == this.TermTypeYear));
		},

		subscriptionItem: function(serviceCommitment, termType) {
			return (termType == this.TermTypeMonth && 
					(serviceCommitment == this.TermTypeMonth || serviceCommitment == this.TermTypeYear));
		},

		getSubscriptionText: function(serviceCommitment, termType) {
			if (this.isSubscription(serviceCommitment, termType)) {
				if (termType === this.TermTypeMonth) {
					return this.SubMonthText;
				} else if (termType === this.TermTypeYear) {
					return this.SubYearText;
				}	
			} else if (this.subscriptionItem(serviceCommitment, termType)) {
				if (serviceCommitment === this.TermTypeMonth) {
					return this.FullSubMonthText;
				} else if (serviceCommitment === this.TermTypeYear) {
					return this.FullSubYearText;
				}	
			}
			return "";
		},

		getSubscriptionPriceText: function(serviceCommitment, termType) {
			if (this.isSubscription(serviceCommitment, termType)) {
				if (termType === this.TermTypeMonth) {
					return this.PriceMonthText;
				} else if (termType === this.TermTypeYear) {
					return this.PriceYearText;
				}	
			} else if (this.subscriptionItem(serviceCommitment, termType)) {
				return this.PriceMonthText;	
			}
			return "";
		}
		
	};
</script>
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                Understanding Flex itemRenderers – Part 3: Communication</h1>
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                                Dynamically changing the itemRenderer</a>
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<a name="articlecontentAdobe_text" style="visibility:hidden"></a><div class="text parbase section"><div class="Semantic LayoutCellSides LayoutBreakAfter TextMedium TextBreak">
						<p>In <a href="/devnet/flex/articles/itemrenderers_pt2.html">Part 2</a> of this series, I showed you how to make external itemRenderers in both MXML and ActionScript. In the examples I've been using, there is a Button which dispatches a custom event—BuyBookEvent—so the application can react to it. This article covers communication with itemRenderers in more detail.</p>
<p>There is a rule I firmly believe must never be violated: you should not get hold of an instance of an itemRenderer and change it (setting public properties) or call its public methods. This, to me, is a big no-no. The itemRenderers are hard to get at for a reason, which I talked about in <a href="/devnet/flex/articles/itemrenderers_pt1.html">Part 1</a>: the itemRenderers are recycled. Grabbing one breaks the Flex framework.</p>
<p>With that rule in mind, here are things you can do with an itemRenderer:</p>
<ul>
<li>An itemRenderer can dispatch events via its list owner. (You've seen bubbling; this is a better practice, which you'll see below.)</li>
<li>An itemRenderer can use static class members. This includes Application.application. If you have values stored &quot;globally&quot; on your application object, you can reach them that way.</li>
<li>An itemRenderer can use public members of the list that owns it. You'll see this below.</li>
<li>An itemRenderer can use anything in the data record. You might, for example, have an item in a record that's not for direct display, but which influences how an itemRenderer behaves.</li>
</ul>
<p>This series includes the following articles:</p>
<ul>
<li>Part 1: <a href="/devnet/flex/articles/itemrenderers_pt1.html">Inline renderers</a></li>
<li>Part 2: <a href="/devnet/flex/articles/itemrenderers_pt2.html">External renderers</a></li>
<li>Part 3: <a href="/devnet/flex/articles/itemrenderers_pt3.html">Communication</a></li>
<li>Part 4: <a href="/devnet/flex/articles/itemrenderers_pt4.html">States and transitions</a></li>
<li>Part 5: <a href="/devnet/flex/articles/itemrenderers_pt5.html">Efficiency</a></li>
</ul>
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<a name="articlecontentAdobe_numberedheader" style="visibility:hidden"></a><div class="parbase compbase numberedheader section"><h3 class="TextH3 LayoutCellSides LayoutRow">
        <a id="articlecontentAdobe_numberedheader"></a>
        Dynamically changing the itemRenderer</h3>
</div>
<a name="articlecontentAdobe_text_0" style="visibility:hidden"></a><div class="text parbase section"><div class="Semantic LayoutCellSides LayoutBreakAfter TextMedium TextBreak">
						<p>Here is the MXML itemRenderer from the previous article used for a TileList. I'm going to make it bit more dynamic by having it react to changes from an external source (I called this file <b>BookItemRenderer.mxml</b>):</p>
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<a name="articlecontentAdobe_codeblock" style="visibility:hidden"></a><div class="parbase codeblock compbase section"><div class="PanelFillLight PanelBevelTop LayoutCell LayoutRow">
        <code class="CodeBlock">&lt;?xml version=&#034;1.0&#034; encoding=&#034;utf-8&#034;?&gt;
&lt;mx:HBox xmlns:mx=&#034;http://www.adobe.com/2006/mxml&#034; width=&#034;250&#034; height=&#034;115&#034; &gt;
	
	&lt;mx:Script&gt;
	&lt;![CDATA[		
	]]&gt;
	&lt;/mx:Script&gt;
	
	&lt;mx:Image id=&#034;bookImage&#034; source=&#034;{data.image}&#034; /&gt;
	&lt;mx:VBox height=&#034;115&#034; verticalAlign=&#034;top&#034; verticalGap=&#034;0&#034;&gt;
		&lt;mx:Text text=&#034;{data.title}&#034; fontWeight=&#034;bold&#034; width=&#034;100%&#034;/&gt;
		&lt;mx:Spacer height=&#034;20&#034; /&gt;
		&lt;mx:Label text=&#034;{data.author}&#034; /&gt;
		&lt;mx:Label text=&#034;Available {data.date}&#034; /&gt;
		&lt;mx:Spacer height=&#034;100%&#034; /&gt;
		&lt;mx:HBox width=&#034;100%&#034; horizontalAlign=&#034;right&#034;&gt;
			&lt;mx:Button label=&#034;Buy&#034; fillColors=&#034;[0x99ff99,0x99ff99]&#034;&gt;
				&lt;mx:click&gt;
				&lt;![CDATA[
					var e:BuyBookEvent = new BuyBookEvent();
					e.bookData = data;
					dispatchEvent(e);
				]]&gt;
				&lt;/mx:click&gt;
			&lt;/mx:Button&gt;
		&lt;/mx:HBox&gt;
	&lt;/mx:VBox&gt;
&lt;/mx:HBox&gt;</code>
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<a name="articlecontentAdobe_text_1" style="visibility:hidden"></a><div class="text parbase section"><div class="Semantic LayoutCellSides LayoutBreakAfter TextMedium TextBreak">
						<p>Suppose you are showing a catalog of items in a TileList. You also have a Slider (not part of the itemRenderer) that lets the user give a range of prices; all items that fall outside of the range should fade out (the itemRenderers' alpha value should change). You need to tell all the itemRenderers that the criteria has changed so that they can modify their alpha values.</p>
        <p>Your override of set data might look something like this:</p>
</div>
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<a name="articlecontentAdobe_codeblock_0" style="visibility:hidden"></a><div class="parbase codeblock compbase section"><div class="PanelFillLight PanelBevelTop LayoutCell LayoutRow">
        <code class="CodeBlock">override public function set data( value:Object ) : void
{
    super.data = value;
    if( data.price &lt; criteria ) alpha = 0.4;
	else alpha = 1;
}</code>
    </div>
</div>
<a name="articlecontentAdobe_text_2" style="visibility:hidden"></a><div class="text parbase section"><div class="Semantic LayoutCellSides LayoutBreakAfter TextMedium TextBreak">
						<p>The question is: how to change the value for <code>criteria</code>? The &quot;best practice&quot; for itemRenderers is to always have them work on the data they are given. In this case, it is unlikely, and impractical, to have the test criteria be part of the data. So that leaves a location outside of the data. You've got two choices:</p>
        <ul>
            <li>Part of the list itself. That is, your list (List, DataGrid, TileList, or other) could be a class that extends a list control and which has this criteria as a public member. </li>
            <li>Part of the application as global data.</li>
        </ul>
        <p>For me, the choice is the first one: extend a class and make the criteria part of that class. After all, the class is being used to display the data, the criteria is part of that display. For this example, I would extend TileList and have the criteria as a public data member. </p>
</div>
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        <code class="CodeBlock">package
{
	
	import mx.controls.TileList;
	
	public class CatalogList extends TileList
	{
		public function CatalogList()
		{
			super();
		}
		
		private var _criteria:Number = 10;
		
		public function get critera() : Number
		{
			return _criteria;
		}
		
		public function set criteria( value:Number ) : void
		{
			_criteria = value;
		}		
	}
}</code>
    </div>
</div>
<a name="articlecontentAdobe_text_3" style="visibility:hidden"></a><div class="text parbase section"><div class="Semantic LayoutCellSides LayoutBreakAfter TextMedium TextBreak">
						<p>The idea is that a control outside of the itemRenderer can modify the criteria by changing this public property on the list control. </p>
<h3>listData </h3>
        <p>The itemRenderers have access to another piece of data: information about the list itself and which row and column (if in a column-oriented control) they are rendering. This is known as <code>listData</code> and it could be used like this in the BookItemRenderer.mxml itemRenderer example:</p>
</div>
				</div>
<a name="articlecontentAdobe_codeblock_2" style="visibility:hidden"></a><div class="parbase codeblock compbase section"><div class="PanelFillLight PanelBevelTop LayoutCell LayoutRow">
        <code class="CodeBlock">override public function set data( value:Object ) : void
{
    super.data = value;
    var criteria:Number = (listData.owner as MyTileList).criteria;
    if( data.price &lt; criteria ) alpha = 0.4;
else alpha = 1;
}</code>
    </div>
</div>
<a name="articlecontentAdobe_text_4" style="visibility:hidden"></a><div class="text parbase section"><div class="Semantic LayoutCellSides LayoutBreakAfter TextMedium TextBreak">
						<p>Place this code into the &lt;mx:Script&gt; block in the example BooktItemRenderer.mxml code, above.</p>
<p>The <code>listData property</code> of the itemRenderer has an <code>owner</code> field, which is the control to which the itemRenderer belongs. In this example, the owner is the <code>MyTileList</code> control—my extension of TileList. Casting the owner field to <code>MyTileList</code> allows the criteria to be fetched.</p>
<h4>IDropInListItemRenderer</h4>
        <p>Access to <code>listData</code> is available when the itemRenderer class implements the IDropInListItemRenderer interface. Unfortunately, UI container components do not implement the interface that gives access to the <code>listData</code>. Control components such as Button and Label do, but for containers you have to implement the interface yourself.</p>
        <p>Implementing this interface is straightforward and found in the Flex documentation. Here's what you have to do for the BookItemRenderer class:</p>
        <ol>
        <li>Have the class implement the interface.</li>
</ol>
</div>
				</div>
<a name="articlecontentAdobe_codeblock_3" style="visibility:hidden"></a><div class="parbase codeblock compbase section"><div class="PanelFillLight PanelBevelTop LayoutCell LayoutRow">
        <code class="CodeBlock">&lt;mx:HBox xmlns:mx=&#034;http://www.adobe.com/2006/mxml&#034; ...
implements=&#034;mx.controls.listClasses.IDropInListItemRenderer&#034;&gt;</code>
    </div>
</div>
<a name="articlecontentAdobe_text_5" style="visibility:hidden"></a><div class="text parbase section"><div class="Semantic LayoutCellSides LayoutBreakAfter TextMedium TextBreak">
						<ol start="2">
<li>Add the <code>set</code> and <code>get</code> functions to the &lt;mx:Script&gt; block in the itemRenderer file.</li>
</ol>
</div>
				</div>
<a name="articlecontentAdobe_codeblock_4" style="visibility:hidden"></a><div class="parbase codeblock compbase section"><div class="PanelFillLight PanelBevelTop LayoutCell LayoutRow">
        <code class="CodeBlock">import mx.controls.listClasses.BaseListData;

    private var _listData:BaseListData;
    public function get listData() : BaseListData
    {
    return _listData;
    }
    public function set listData( value:BaseListData ) : void
    {
    _listData = value;
    }</code>
    </div>
</div>
<a name="articlecontentAdobe_text_6" style="visibility:hidden"></a><div class="text parbase section"><div class="Semantic LayoutCellSides LayoutBreakAfter TextMedium TextBreak">
						<p>When the list control sees that the itemRenderer implements the IDropInListItemRenderer interface, it will create a <code>listData</code> item and assign it to every itemRenderer instance. </p>
        <h4>invalidateList()</h4>
        <p>Setting the criteria in my class isn't as simple as assigning a value. Doing that won't tell the Flex framework that the data has been changed. The change to the criteria must trigger an event. Here's the modification to the <code>set criteria()</code> function:</p>
</div>
				</div>
<a name="articlecontentAdobe_codeblock_5" style="visibility:hidden"></a><div class="parbase codeblock compbase section"><div class="PanelFillLight PanelBevelTop LayoutCell LayoutRow">
        <code class="CodeBlock">public function set criteria( value:Number ) : void
		{
			_criteria = value;
			
			invalidateList();
		}</code>
    </div>
</div>
<a name="articlecontentAdobe_text_7" style="visibility:hidden"></a><div class="text parbase section"><div class="Semantic LayoutCellSides LayoutBreakAfter TextMedium TextBreak">
						<p>Notice that once the <code>_criteria</code> value has been set, it calls <code>invalidateList()</code>. This causes all of the itemRenderers to be reset with values from the dataProvider and have their set data functions called. </p>
        <p>The process then looks like this:</p>
        <ol>
           <li>The itemRenderer looks into its list owner for the criteria to use to help it determine how to render the data.</li>
           <li>The list owner class, an extension of one of the Flex list classes, contains public properties read by the itemRenderer(s) and set by external code—another control or ActionScript code (perhaps as the result of receiving data from a remote call).</li>
           <li>When the list's property is set, it calls the list's invalidateList() method. This triggers a refresh of the itemRenderers, causing them to have their data reset (and back to step 1). </li>
        </ol>
 </div>
				</div>
<a name="articlecontentAdobe_numberedheader_0" style="visibility:hidden"></a><div class="parbase compbase numberedheader section"><h3 class="TextH3 LayoutCellSides LayoutRow">
        <a id="articlecontentAdobe_numberedheader_0"></a>
        Events</h3>
</div>
<a name="articlecontentAdobe_text_8" style="visibility:hidden"></a><div class="text parbase section"><div class="Semantic LayoutCellSides LayoutBreakAfter TextMedium TextBreak">
						<p>In the previous articles I showed how to use event bubbling to let the itemRenderer communicate with the rest of the application. I think this is certainly quick. But I also think there is a better way, one which fits the assumption that an itemRenderer's job is to present data and the control's job is to handle the data.</p>
<p>The idea of the <code>MyTileList</code> control is that it is the visible view—of the catalog of books for sale. When a user picks a book and wants to buy it, it should be the responsibility of the list control to communicate that information to the application. In other words:</p>
<p><code>&lt;CatalogList bookBuy=&quot;addToCart(event)&quot; /&gt;</code></p>
<p>The way things are set up right now, the event bubbles up and bypasses the <code>MyTileList</code>. The bubbling approach doesn't associate the event (<code>bookBuy</code>) with the list control (<code>MyTileList</code>), allowing you to move the control to other parts of your application. For instance, if you code the event listener for <code>bookBuy</code> on the main Application, you won't be able to move the list control to another part of the application. You'll have to move that event handler, too. If, on the other hand, you have the event associated with the control, you just move the control.</p>
<p>Look at it this way: suppose the click event on the Button wasn't actually an event dispatched by the Button, but bubbled up from something inside of the button. You'd never be able to do: &lt;mx:Button click=&quot;doLogin()&quot; label=&quot;Log in&quot; /&gt;; you would have to put the <code>doLogin()</code> function someplace else, and that would make the application even harder to use.</p>
<p>I hope I've convinced you, so here's how to change the example from bubbling to dispatching from the list control.</p>
<ol>
<li>Add metadata to the CatalogList control to let the compiler know the control dispatches the event:</li>
</ol>
</div>
				</div>
<a name="articlecontentAdobe_codeblock_6" style="visibility:hidden"></a><div class="parbase codeblock compbase section"><div class="PanelFillLight PanelBevelTop LayoutCell LayoutRow">
        <code class="CodeBlock">import events.BuyBookEvent;
	import mx.controls.TileList;

	[Event(name=&#034;buyBook&#034;,type=&#034;events.BuyBookEvent&#034;)]
	
	public class CatalogList extends TileList
	{</code>
    </div>
</div>
<a name="articlecontentAdobe_text_9" style="visibility:hidden"></a><div class="text parbase section"><div class="Semantic LayoutCellSides LayoutBreakAfter TextMedium TextBreak">
						<ol start="2">
<li>Add a function to CatalogList to dispatch the event. This function will be called by the itemRenderer instances: </li>
</ol>
</div>
				</div>
<a name="articlecontentAdobe_codeblock_7" style="visibility:hidden"></a><div class="parbase codeblock compbase section"><div class="PanelFillLight PanelBevelTop LayoutCell LayoutRow">
        <code class="CodeBlock">public function dispatchBuyEvent( item:Object ) : void
		{
			var event:BuyBookEvent = new BuyBookEvent();
			event.bookData = item;
			dispatchEvent( event );
		}
		
	}</code>
    </div>
</div>
<a name="articlecontentAdobe_text_10" style="visibility:hidden"></a><div class="text parbase section"><div class="Semantic LayoutCellSides LayoutBreakAfter TextMedium TextBreak">
						<ol start="3">
<li>Change the Buy button code in the itemRenderer to invoke the function: </li>
</ol>
</div>
				</div>
<a name="articlecontentAdobe_codeblock_8" style="visibility:hidden"></a><div class="parbase codeblock compbase section"><div class="PanelFillLight PanelBevelTop LayoutCell LayoutRow">
        <code class="CodeBlock">&lt;mx:Button label=&#034;Buy&#034; fillColors=&#034;[0x99ff99,0x99ff99]&#034;&gt;
    &lt;mx:click&gt;
    &lt;![CDATA[
        (listData.owner as CatalogList).dispatchBuyEvent(data);
    ]]&gt;
    &lt;/mx:click&gt;
    &lt;/mx:Button&gt;</code>
    </div>
</div>
<a name="articlecontentAdobe_text_11" style="visibility:hidden"></a><div class="text parbase section"><div class="Semantic LayoutCellSides LayoutBreakAfter TextMedium TextBreak">
						<p>Now the Button in the itemRenderer can simply invoke a function in the list control with the data for the record (or anything else that is appropriate for the action) and pass the responsibility of interfacing with the rest of the application onto the list control.</p>
            <p>The list control in this example dispatches an event with the data. The application can add event listeners for this event either using ActionScript or, because of the <code>[Event]</code> metadata in the CatalogList.as file, MXML; using <code>[Event]</code> metadata makes it easier for developers to use your code. </p>
            <h3>Where to go from here</h3>
            <p>itemRenderers should communicate any actions using events. Custom events allow you to pass information with the event so the consumer of the event doesn't have to reach out to the itemRenderer for any data. </p>
            <p>itemRenderers should &quot;react&quot; to changes in data by overriding their set data functions. Inside of the function they can access values in their listData.owner. They could also access data stored in a static class or in the main application via Application.application.</p>
            <p>In the next article we'll look at incorporating states into itemRenders. </p>
</div>
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						<p><a rel="license" href="http://creativecommons.org/licenses/by-nc-sa/3.0/" target="_blank"><img alt="Creative Commons License" style="border-width: 0pt;" src="http://i.creativecommons.org/l/by-nc-sa/3.0/88x31.png"></a><br>
This work is licensed under a <a href="http://creativecommons.org/licenses/by-nc-sa/3.0/" rel="license" target="_blank">Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unported License</a></p>
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