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<title>Spark layouts with Flex 4 | Adobe Developer Connection</title><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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<meta name="author" content="Evtim Georgiev" />
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<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>
<span id="tooltipStringOpenLink">Open link</span>
</div>
-->
<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>
</div>
</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>
</form>
<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>
</div>
<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>
<a href="/go/gnav_learning_en_us" id="shSectionsLearningMobile" class="SiteHeaderBarExtendSectionsItem SiteHeaderBarLink">Learning</a>
</div>
</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>
</form>
</div>
</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>
<a href="/cfusion/membership/logout.cfm" id="shSignOutMobile" class="SiteHeaderUserItem SiteHeaderUserItemMobile LinkStrong" style="display: none;">Sign out</a>
<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>
</div>
</div>
<!--googleon: index--><div class="hovercart"><div id="HoverCartModal">
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<div class="CartHeaderPopPanel HoverCart" id="CartPanel">
<div id="HoverCartItem" class="RuleHBottom HoverCart-1-3 LayoutBigRowTop" style="display: none">
<div class="LayoutBreakAfter">
<div class="HoverCart-1 LayoutHItem">
<div style="padding-left:60px;" class=" LayoutBreakAfter LayoutPullout">
<div id="HoverCartBoxShotxyz" class="HoverCartBoxShot">
<a href="">
<img src="" class="LayoutImage" alt=""/>
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<div style="float:left;width:100%" class="CPodCostCell">
<span class="TextStrong ProductName" id="HoverCartHeaderxyz">
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<div class="LayoutBigRowBottom" id="HoverCartDescriptionxyz">
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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>
<span id="HoverCartPreOrderSoftGoodMsgxyz" style="display:none;" class="TextWarning TextPostScript">Preorder Estimated Availability <span id="HoverCartPreOrderSoftGoodMsgDatexyz">Date</span>. Your credit card will not be charged until the product is ready to download. Estimated availability date is subject to change.</span>
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</div>
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<div class="LayoutHItem HoverCart-2">
<div class="HoverCartQty">
Qty:
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<div class="LayoutRight">
<div class="CheckoutCostDark LayoutRight TextRight">
<span id="HoverCartPricexyz">
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<span id="HoverCartSubscriptionxyz" class="CheckoutSubscription">
</span>
<div id="HoverCartVatPercentageLabelxyz" class="TextEm TextSmall" style="display:none; max-width: 100px;"><span id="HoverCartVatPercentagePreTextxyz"></span>
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<div class="HoverCartEDUMessage LayoutBigCellBottom" style="display:none">Purchase requires verification of academic eligibility</div>
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<a id="HoverCartMoreItems" class="LayoutBreakAfter" style="text-align: center;" href="/cart.html"></a>
<div id="HoverCartButtons" class="HoverCart-1-3">
<table border="0" align="right" width="70%">
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<td>
<div class="TextRight HoverCartSubTotal">Subtotal</div>
<div id="ExVatLabel" style="display:none" class="TextEm TextSmall TextRight"></div>
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<td>
<div class="LayoutRight TextRight">
<div class="CheckoutCostDark">
<span id="HoverCartSubTotal">
</span>
</div>
</div>
</td>
</tr>
<tr id="HoverCartPromotionsRow">
<td>
<div class="TextRight HoverCartPromotionsLabel HoverCartSubTotal">Promotions</div>
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<td>
<div class="LayoutRight TextRight">
<div class="CheckoutCostDark">
<span id="HoverCartPromotions">
</span>
</div>
</div>
</td>
</tr>
<tr id="HoverCartShippingRow">
<td>
<div class="TextRight HoverCartShippingLabel HoverCartSubTotal">Estimated shipping</div>
</td>
<td>
<div class="LayoutRight TextRight">
<div class="CheckoutCostDark">
<span id="HoverCartShipping">
</span>
</div>
</div>
</td>
</tr>
<tr id="HoverCartVATRow">
<td>
<div class="TextRight HoverCartVATLabel HoverCartSubTotal">Tax</div>
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<td>
<div class="LayoutRight TextRight">
<div class="CheckoutCostDark">
<span id="HoverCartVat">
</span>
</div>
<div id="CartTaxHeader">
Calculated at checkout</div>
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</td>
</tr>
<tr>
<td><div class="RuleH"></div></td>
<td><div class="RuleH"></div></td>
</tr>
<tr>
<td>
<div class="TextRight HoverCartTotalLabel HoverCartSubTotal">Total</div>
</td>
<td>
<div class="LayoutRight TextRight">
<div class="CheckoutCostDark">
<span id="HoverCartTotal">
</span>
</div>
</div>
</td>
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</table>
<div class="LayoutBreak"></div>
<div class="HoverCart-1-3 LayoutRight LayoutCellTop LayoutBreakAfter">
<a href="/cart.html" id="HoverCartCheckOut" class="CartButtonYellow CartShopCheckOut LayoutRight"><span class="CartBuyIconText">Review and Checkout</span></a>
</div>
</div>
</div>
</div>
</div>
<script>
/*global jQuery,adobe*/
jQuery.createNs("Adobe.Cart.ShoppingCart");
Adobe.Cart.ShoppingCart.HoverCart = {
MaxItems: "4",
DisplayTime: "5000",
MoreItemsTextSingular: "() more item in your cart",
MoreItemsTextPlural: "() more items in your cart",
MonthToMonthText: "per month",
YearlyText: "per year"
};
Adobe.Cart.TaxLabels = {
TaxInclusiveText : "",
TaxNotApplicable : "Tax not applicable"
};
Adobe.Cart.ShoppingCart.GlobalVars = {
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MarketSegment: "COM",
AkamaiURLPrefix: "http://wwwimages.adobe.com/www.adobe.com",
PriceMonthText: "per month",
PriceYearText: "per year",
FullSubMonthText: "Month-to-month",
FullSubYearText: "One-year",
SubMonthText: "Monthly",
SubYearText: "Annual",
SubscriptionItemText: "NONE",
TermTypeMonth: "MONTH",
TermTypeYear: "YEAR",
BackupDVDParent: "_PARENT",
/*
params: {
cart,
price,
categoryPath,
originalPrice,
storeName,
locale,
usePrecision,
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>
</div>
<div id="modalContent" style="display:none;"></div>
</div>
<!--googleon: all--></div>
<div class="Link" id="top">
<div class="Link LayoutBreakAfter">
<div class="parbase compbase breadcrumb"><div class="LayoutHeader LayoutBreakAfter Link">
<div class="LayoutHeaderPath">
<div class="LayoutCellSides LinkStrong LayoutH IconAlign">
<span class="LayoutHItem LayoutSmallGutterRight">
<a href="/devnet.html">
Adobe Developer Connection</a>
</span>
<span class="LayoutSmallGutterRight LayoutHItem">/</span>
<span class="LayoutHItem LayoutSmallGutterRight">
<a href="/devnet/flex.html">
Flex Developer Center</a>
</span>
<span class="LayoutSmallGutterRight LayoutHItem">/</span>
</div>
</div>
</div>
</div>
<div class="LayoutGrid-1-3 LayoutSlimGrid-1-2">
<h1 class="LayoutCellSides LayoutSmallRow TextH1">
Spark layouts with Flex 4</h1>
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by&nbsp;<a href="/devnet/author_bios/evtim_georgiev.html">Evtim Georgiev</a></h2>
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Comparing Spark and MX layouts</a>
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Working with the Spark Layouts</a>
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Creating a custom Spark layout</a>
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<h2 class="TextH5 LayoutSmallRow">Modified</h2>
<p>8 March 2010</p>
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<h3>Additional Requirements</h3>
<h4>Flash Builder 4 (not strictly required, but useful)</h4>
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<p>Spark, the new component and skinning architecture in Flex 4, brings a lot to the RIA table and addresses a number of pain points in skinning, CSS, components, states, animation, text, graphics tags, layouts, and more.</p>
<p>In this article I'm going to focus on Spark layouts. I will provide an overview of the major architectural differences between Spark and Flex 3 layouts. After a brief discussion of usage differences I'll step through creating a custom Spark layout—a simple flow layout class.</p>
<p>Throughout this article the term MX refers to layouts, components, and the general architecture of the Flex 3 framework. The term Spark refers to layouts, components, and the general architecture introduced with Flex 4.</p>
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Comparing Spark and MX layouts</h3>
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<p>As with most other features of the new Spark architecture, the new layouts are in fact based on the already powerful MX layout system. Flex 3 developers will feel at home with the general execution flow, APIs, and layout logic. However, there are also a number of additions and changes that are driven by the Spark goal of more modular design.</p>
<h4>Common characteristics</h4>
<p>For the developer working in MXML, not much has changed. Properties such as <code>width</code>, <code>height</code>, <code>minWidth</code>, <code>explicitWidth</code>, and <code>percentWidth</code> as well as their syntax and semantics have not changed. Well-known styles such as <code>left</code>, <code>right</code>, <code>top</code>, <code>horizontalCenter</code>, and <code>baseline</code> are supported.</p>
<p>The component developer will find familiar elements as well. The core LayoutManager class and component lifecycle have stayed the same. The three familiar methods for component developers—<code>commitProperties()</code>, <code>measure()</code>, and <code>updateDisplayList()</code>—are still called by the LayoutManager in the same order and the invalidation rules have not changed.</p>
<p>Components still have their default size calculated when their <code>measure()</code> method is called. Also, Components still have their children sized and arranged when their <code>updateDisplayList()</code> method is called.</p>
<h4>Notable changes</h4>
<p>Perhaps the most obvious layout difference is that in Spark the layouts have been separated from the containers! When a Spark container <code>measure()</code> or <code>updateDisplayList()</code> method is called, the task of measurement and child arrangement is promptly delegated to a Spark layout instance. This separation comes along with a number of other related novelties:</p>
<ul>
<li>Layout logic is abstracted in separate classes inheriting from the LayoutBase class. LayoutBase is the minimum contract for a class to be a Spark layout.</li>
<li>New APIs are introduced as a contract between Spark layouts and the elements they measure, size, and position. These are represented by the ILayoutElement interface and are designed to support robust 2D and 3D transformations. If you're not creating your own layout, then you probably don't care about this interface, but if you do, it will hopefully save you a lot of time.</li>
<li>Layout <i>virtualization—</i>the creation, destruction, and recycling of itemRenderers for data containers<i>—</i>is fully implemented by the DataGroup container, Spark's basic building block for data containers. Spark layouts can support virtualization relatively easily because the heavy lifting is done by the DataGroup.</li>
<li>The display list order is now decoupled from the child order in Spark containers. For example the first child can render on top of the last child.</li>
</ul>
<h4>Improvements and new features</h4>
<p>The changes in the Spark layout are geared towards making the whole system more modular, powerful, and extensible. Here is a list of the new features and enhancements that Spark brings as a direct result of the aforementioned changes:</p>
<ul>
<li><b>Assignable layouts</b>—Since the layout logic is separate from the containers, Spark containers can be assigned different Spark layouts, even at run time. This reduces the number of container classes, while promoting modularity and code reuse. For example, in Spark there is only one List class. To get similar functionality to the legacy MX TileList, you simply assign it a new TileLayout instance.</li>
<li><b>Custom layouts—</b>Together with the separation of the layout logic from the containers, the new LayoutBase class and the ILayoutElement interface enable developers to quickly and easily create powerful layouts that can be mixed and matched with stock Spark containers.</li>
<li><b>Arbitrary 2D transformations—</b>The stock Spark layouts now support arbitrary 2D transformations. This support is built into the ILayoutElement interface that is implemented by all children of a Spark container. This makes developing custom layouts with 2D transform support effortless.</li>
<li><b>Per-pixel scrolling everywhere—</b>The reworked virtualization support in DataGroup allows for smooth per-pixel scrolling in Spark containers. Implementing scrolling support in a custom layout, again, is a breeze.</li>
<li><b>3D support</b>—The LayoutBase and ILayoutElement interfaces are designed with 3D support in mind. There are already 3D custom layouts examples floating around the web, including CoverFlow, Carousel, and WheelLayout to name a few.</li>
<li><b>Depth order</b>—Developers can specify the depth of each child, either in MXML or from a custom layout.</li>
<li><b>Post-layout transforms—</b>Developers can specify properties like <code>x</code>, <code>y</code>, <code>z</code>, <code>rotation</code>, <code>scale</code>, and more without affecting the layout. Since now all the stock Spark layouts have built-in 2D transform support, this new feature comes quite handy in lots of cases. Consider a hover over effect for example, where moving the mouse over a thumbnail in a horizontal list can scale it up a little or flip it in 3D, without actually pushing the siblings to the right.</li>
<li><b>Consistent coordinate space—</b>All of the size properties <code>width</code>, <code>height</code>, <code>measuredWidth</code>, and <code>measuredHeight</code> are now <i>always</i> consistently pre-transform. This eliminates confusing rules like &quot;<code>measuredWidth</code> is <code>unscaled</code> in <code>measure()</code>, but scaled in <code>updateDisplayList()</code>&quot;.</li>
</ul>
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<a id="articlecontentAdobe_numberedheader_0"></a>
Working with the Spark Layouts</h3>
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<p>Because layouts and containers are separated in Spark, there are a few notable changes that you need to take into account when working with the layouts. Take a moment to examine the following table of MX layout container classes and their corresponding combination of Spark layout and container:</p>
<table><tbody>
<tr>
<th>MX Containers</th>
<th>Corresponding combination of Spark Layout and Container</th>
</tr>
<tr>
<td>Canvas</td>
<td>Group <span>with BasicLayout</span> (no advanced constraints)</td>
</tr>
<tr>
<td>HBox</td>
<td>Group with HorizontalLayout (or the HGroup class)</td>
</tr>
<tr>
<td>VBox</td>
<td>Group with VerticalLayout (or the VGroup class)</td>
</tr>
<tr>
<td>Tile</td>
<td>Group with TileLayout</td>
</tr>
<tr>
<td>List</td>
<td>List with VerticalLayout</td>
</tr>
<tr>
<td>TileList</td>
<td>List with TileLayout</td>
</tr>
</tbody>
</table>
<p>Note that Spark provides convenient classes for commonly used combinations<i>—</i>the HGroup and VGroup classes are simple Group classes that have HorizontalLayout and VerticalLayout by default.</p>
<h4>MXML syntax</h4>
<p>To specify the layout for a container, set its <code>layout</code> property to an instance of a Spark layout:</p>
</div>
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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;s:List id=&#034;list&#034;&gt;
&lt;s:layout&gt;
&lt;s:HorizontalLayout/&gt;
&lt;/s:layout&gt;
...
&lt;/s:List&gt;</code>
</div>
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<a name="articlecontentAdobe_text_2" style="visibility:hidden"></a><div class="text parbase section"><div class="Semantic LayoutCellSides LayoutBreakAfter TextMedium TextBreak">
<p>All layout properties are accessible through that layout class instance. Here's an example that shows how to configure the gap and the vertical alignment:</p>
</div>
</div>
<a name="articlecontentAdobe_codeblock_0" style="visibility:hidden"></a><div class="parbase codeblock compbase section"><div class="PanelFillLight PanelBevelTop LayoutCell LayoutRow">
<code class="CodeBlock">&lt;s:List id=&#034;list&#034;&gt;
&lt;s:layout&gt;
&lt;s:HorizontalLayout gap=&#034;0&#034; verticalAlign=&#034;justify&#034;/&gt;
&lt;/s:layout&gt;
...
&lt;/s:List&gt;</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>This new MXML syntax has another benefit. All the layout-related properties for the container are naturally separated into the layout class. It's very convenient to go through all of the properties for a specific layout and use code hinting to figure out what's supported by that layout.</p>
<h4>Scrollbars</h4>
<p>The Spark containers Group and DataGroup are light-weight basic building block classes. Even though they support clipping and scrolling, they don't put up scrollbars automatically like MX does. Spark exposes lower-level APIs that allow for manual hook-up of scrollbars to Group and DataGroup<code>–clipAndEnableScrolling, horizontalScrollPosition, verticalScrollPosition, contentWidth, </code>and<code> contentHeight</code>. But there's also a higher-level component that facilitates this process. Wrapping any Group or DataGroup in a Scroller will enable clipping and scrolling, and the Scroller will take care of hooking up and displaying scrollbars when necessary:</p>
</div>
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<a name="articlecontentAdobe_codeblock_1" style="visibility:hidden"></a><div class="parbase codeblock compbase section"><div class="PanelFillLight PanelBevelTop LayoutCell LayoutRow">
<code class="CodeBlock"> &lt;s:Scroller width=&#034;200&#034;&gt;
&lt;s:Group&gt;
&lt;s:layout&gt;
&lt;s:HorizontalLayout gap=&#034;0&#034; verticalAlign=&#034;justify&#034;/&gt;
&lt;/s:layout&gt;
&lt;s:Button label=&#034;one&#034;/&gt;
&lt;s:Button label=&#034;two&#034;/&gt;
&lt;s:Button label=&#034;three&#034;/&gt;
&lt;s:Button label=&#034;four&#034;/&gt;
&lt;s:Button label=&#034;five&#034;/&gt;
&lt;/s:Group&gt;
&lt;/s:Scroller&gt;</code>
</div>
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<a name="articlecontentAdobe_text_4" style="visibility:hidden"></a><div class="text parbase section"><div class="Semantic LayoutCellSides LayoutBreakAfter TextMedium TextBreak">
<p>In fact, that's exactly how scrolling is implemented for the rest of the Spark containers. Their skins contain a <code>contentGroup</code> or <code>dataGroup</code> part that is placed inside a Scroller. Take a look at the default List skin (the file <kbd>spark/skins/spark/ListSkin.mxml</kbd> comes with Flex 4):</p>
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<a name="articlecontentAdobe_codeblock_2" style="visibility:hidden"></a><div class="parbase codeblock compbase section"><div class="PanelFillLight PanelBevelTop LayoutCell LayoutRow">
<code class="CodeBlock">...
&lt;!--- The Scroller component to add scroll bars to the list. --&gt;
&lt;s:Scroller left=&#034;0&#034; top=&#034;0&#034; right=&#034;0&#034; bottom=&#034;0&#034; id=&#034;scroller&#034; minViewportInset=&#034;1&#034; focusEnabled=&#034;false&#034;&gt;
&lt;!--- The container for the data items. --&gt;
&lt;s:DataGroup id=&#034;dataGroup&#034; itemRenderer=&#034;spark.skins.spark.DefaultItemRenderer&#034;&gt;
&lt;s:layout&gt;
&lt;s:VerticalLayout gap=&#034;0&#034; horizontalAlign=&#034;contentJustify&#034; /&gt;
&lt;/s:layout&gt;
&lt;/s:DataGroup&gt;
&lt;/s:Scroller&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">
<p>Of course, all Spark scrolling APIs, scrollbars, layouts, and the Scroller class naturally support per-pixel scrolling.</p>
</div>
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<a id="articlecontentAdobe_numberedheader_1"></a>
Creating a custom Spark layout</h3>
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<a name="articlecontentAdobe_text_6" style="visibility:hidden"></a><div class="text parbase section"><div class="Semantic LayoutCellSides LayoutBreakAfter TextMedium TextBreak">
<p>A major goal of the Spark layouts is to simplify the process of creating custom layouts. Even though a new layout requires the creation of a separate class, you can get it to a functional state with relatively few lines of code. After that you can choose to gradually add more functionality to meet your specific requirements. To explore this, I'm going to create a simple FlowLayout class in which all the elements of a container are arranged horizontally, wrapping to the next row when the container width limit is reached. See Figure 1 and Figure 2 for a container with text elements, arranged by a FlowLayout at different width settings.</p>
</div>
</div>
<a name="articlecontentAdobe_image" style="visibility:hidden"></a><div class="parbase image section"><div class="LayoutRow LayoutCellSides">
<img title="Text within a List container with FlowLayout and width set to 212 pixels" alt="Text within a List container with FlowLayout and width set to 212 pixels" class="cq-dd-image LayoutImage LayoutRow " src="/content/dotcom/en/devnet/flex/articles/spark_layouts/_jcr_content/articlecontentAdobe/image.adimg.mw.362.jpg/1279856107423.jpg"/></div>
<div class="TextSmall LayoutCellSides LayoutRowTop LayoutBigRowBottom">
Figure 1. Text within a List container with FlowLayout and width set to 212 pixels</div>
</div>
<a name="articlecontentAdobe_image_0" style="visibility:hidden"></a><div class="parbase image section"><div class="LayoutRow LayoutCellSides">
<img title="Text within a List container with FlowLayout and width set to 108 pixels" alt="Text within a List container with FlowLayout and width set to 108 pixels" class="cq-dd-image LayoutImage LayoutRow " src="/content/dotcom/en/devnet/flex/articles/spark_layouts/_jcr_content/articlecontentAdobe/image_0.adimg.mw.363.jpg/1279856142640.jpg"/></div>
<div class="TextSmall LayoutCellSides LayoutRowTop LayoutBigRowBottom">
Figure 2. Text within a List container with FlowLayout and width set to 108 pixels</div>
</div>
<a name="articlecontentAdobe_text_8" style="visibility:hidden"></a><div class="text parbase section"><div class="Semantic LayoutCellSides LayoutBreakAfter TextMedium TextBreak">
<h4>Size and position elements</h4>
<p>The minimal requirements for a functional Spark layout are deriving from the base class LayoutBase and implementing the <code>updateDisplayList()</code> method. Here's what an empty layout skeleton looks like:</p>
</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">public class FlowLayout extends
LayoutBase
{
override public function updateDisplayList(containerWidth:Number, containerHeight:Number):void
{
// TODO: iterate over the elements of the container,
// resize and position them.
}
}</code>
</div>
</div>
<a name="articlecontentAdobe_text_9" style="visibility:hidden"></a><div class="text parbase section"><div class="Semantic LayoutCellSides LayoutBreakAfter TextMedium TextBreak">
<p>When a layout is assigned to a container, the layout's <code>target</code> property is updated with that container. Looping over the target's elements is straightforward. Data containers, like DataGroup and List, use item renderer instances for each data item being displayed. The creation, recycling and destruction of item renderers is provided by the container. These containers are also referred to as <i>virtualized</i> since item renderers are created and reused for only a portion of all the data items. Typically, layouts that support virtualization use the scroll position and size to calculate which data items fall within the viewport and request elements only for the visible data items. When the layout requests an element, the data container will create and return the item renderer for the corresponding data item. For this example however, the FlowLayout requests an element for each data item as layout virtualization is beyond the scope of this article. If the container is virtualized, I call the <code>getVirtualElementAt()</code> method, otherwise I call <code>getElementAt()</code>:</p>
</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">var layoutTarget:GroupBase = target;
var count:int = layoutTarget.numElements;
for (var i:int = 0; i &lt; count; i++)
{
var element:ILayoutElement = useVirtualLayout ?
layoutTarget.getVirtualElementAt(i) :
layoutTarget.getElementAt(i);
}</code>
</div>
</div>
<a name="articlecontentAdobe_text_10" style="visibility:hidden"></a><div class="text parbase section"><div class="Semantic LayoutCellSides LayoutBreakAfter TextMedium TextBreak">
<p>Resizing and positioning the elements is also straightforward using the ILayoutElement APIs. The interface provides several useful methods to query the minimum, maximum, and preferred sizes as well as get and set element bounds, both pre- and post-transform. There are also methods for manipulating the 2D/3D transformation matrices. A detailed review of these is beyond the scope of this article, but here's a quick comparison with the APIs that the MX layout containers use:</p>
<table> <thead> <tr>
<th> MX APIs on UIComponent (pre-transform only) </th>
<th> Spark APIs through ILayoutElement (pre- or post-transform) </th>
</tr>
</thead> <tbody>
<tr>
<td> getExplicitOrMeasuredWidth() </td>
<td> getPreferredBoundsWidth() </td>
</tr>
<tr>
<td> setActualSize() </td>
<td> setLayoutBoundsSize() </td>
</tr>
<tr>
<td> get x, get y </td>
<td> getLayoutBoundsX(), getLayoutBoundsY() </td>
</tr>
<tr>
<td> move() </td>
<td> setLayoutBoundsPosition() </td>
</tr>
</tbody>
</table>
<p>The following ILayoutElement APIs are used in the implementation of the <code>updatedisplayList()</code> method:</p>
<ul>
<li> Resize the element using <code>setLayoutBoundsSize(width, height)</code>. Quick tip: pass in <code>NaN</code> to set the element to its preferred size.</li>
<li> Get the current bounds of the element through <code>getLayoutBoundsWidth()</code> and <code>getLayoutBoundsHeight()</code>.</li>
<li> Position the element with <code>setLayoutBoundsPosition(x, y)</code>; the coordinates are relative to the container's origin.</li>
</ul>
<p>Here is what the <code>updateDisplayList()</code> code looks like (the code is also in the sample file <kbd>FlowLayout1.as</kbd> ):</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">for (var i:int = 0; i &lt; count; i++)
{
// get the current element, we&#039;re going to work with the
// ILayoutElement interface
var element:ILayoutElement = useVirtualLayout ?
layoutTarget.getVirtualElementAt(i) :
layoutTarget.getElementAt(i);
element.setLayoutBoundsSize(NaN, NaN);
// Find out the element&#039;s dimensions sizes.
// We do this after the element has been already resized
// to its preferred size.
var elementWidth:Number = element.getLayoutBoundsWidth();
var elementHeight:Number = element.getLayoutBoundsHeight();
// Would the element fit on this line, or should we move
// to the next line?
if (x + elementWidth &gt; containerWidth)
{
// Start from the left side
x = 0;
// Move down by elementHeight, we&#039;re assuming all
// elements are of equal height
y += elementHeight;
}
// Position the element
element.setLayoutBoundsPosition(x, y);
// Update the current position, add a gap of 10
x += elementWidth + 10;
}</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 that the FlowLayout is functional, I can configure the container using the familiar MXML syntax (this code is also in the sample FlowLayoutTest.mxml file):</p>
</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">&lt;s:List id=&#034;list1&#034; width=&#034;{widthSlider.value}&#034; height=&#034;112&#034;
dataProvider=&#034;{new ArrayCollection(
&#039;The quick fox jumped over the lazy dog&#039;.split(&#039; &#039;))}&#034;&gt;
&lt;!-- Configure the layout to be the FlowLayout --&gt;
&lt;s:layout&gt;
&lt;my:FlowLayout/&gt;
&lt;/s:layout&gt;
&lt;/s:List&gt; </code>
</div>
</div>
<a name="articlecontentAdobe_text_12" style="visibility:hidden"></a><div class="text parbase section"><div class="Semantic LayoutCellSides LayoutBreakAfter TextMedium TextBreak">
<h4>Scrolling support</h4>
<p>The FlowLayout works pretty well, but scrolling doesn't seem to function. I want the FlowLayout to be scrollable. In theory this means that I need to complete the following steps:</p>
<ol>
<li>Add scrollbars.</li>
<li> Hook up the scrollbars with the layout's <code>horizontalScrollPosition</code> and <code>verticalScrollPosition</code> properties (these properties are implemented by the LayoutBase class).</li>
<li> Calculate the ranges for the scrollbars and keep them in sync whenever the values change.</li>
</ol>
<p>Having a Scroller in the default List skin automatically addresses steps 1 and 2. In practice, all I really have to do is calculate the scrollbar ranges. This is basically the total width and height of the scrollable area of the container—the so called <i>content size</i>. Calculating the content size is easy enough. I find the maximum extents of all the elements while resizing and arranging them in the <code>updateDisplayList()</code> method. At the very end of that method I set the updated content size using the following code (see the sample <kbd>FlowLayout2.as</kbd> file):</p>
</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">layoutTarget.setContentSize(maxWidth, maxHeight);</code>
</div>
</div>
<a name="articlecontentAdobe_text_13" style="visibility:hidden"></a><div class="text parbase section"><div class="Semantic LayoutCellSides LayoutBreakAfter TextMedium TextBreak">
<h4>Adding properties</h4>
<p>The common way to configure Spark layouts is through properties they expose. Adding properties to a custom layout is just like adding properties to any Flex class. It's a good idea to check the <code>target</code> property for <code>null</code> because in certain scenarios, for example during initialization, a property setter may get called before the <code>target</code> has been initialized. Also make sure that when the property value changes, the target container size and/or display list are invalidated appropriately. This ensures that the LayoutManager will call the container back to recalculate the layout. Here's what the <code>horizontalGap</code> property setter of FlowLayout looks like (this code is also in the sample <kbd>FlowLayout3.as</kbd> file):</p>
</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">public function set
horizontalGap(value:Number):void
{
_horizontalGap = value;
var layoutTarget:GroupBase = target;
if (layoutTarget)
layoutTarget.invalidateDisplayList();
}</code>
</div>
</div>
<a name="articlecontentAdobe_text_14" style="visibility:hidden"></a><div class="text parbase section"><div class="Semantic LayoutCellSides LayoutBreakAfter TextMedium TextBreak">
<p>When invoked by the LayoutManager, the container will delegate to the <code>measure()</code> and <code>updateDisplayList()</code> methods of the layout. In this example, I'm going include the newly added <code>horizontalGap</code> property in the position calculation for the next element. The code, near the bottom of the <code>updateDisplayList()</code> loop, looks like this:</p>
</div>
</div>
<a name="articlecontentAdobe_codeblock_9" style="visibility:hidden"></a><div class="parbase codeblock compbase section"><div class="PanelFillLight PanelBevelTop LayoutCell LayoutRow">
<code class="CodeBlock">// Update the current position, add the gap
x += elementWidth + _horizontalGap;</code>
</div>
</div>
<a name="articlecontentAdobe_text_15" style="visibility:hidden"></a><div class="text parbase section"><div class="Semantic LayoutCellSides LayoutBreakAfter TextMedium TextBreak">
<h4>Measuring the container's default size</h4>
<p>In Flex, measurement determines the default size of a component. The default size is used when the component doesn't have an explicit size defined. For example, a MX Canvas that contains some text, but doesn't have its <code>width</code> or <code>height</code> explicitly specified, will measure its default size to be just big enough to display all the text.</p>
<p>In Spark, whenever a container needs to be measured, the <code>measure()</code> method of its layout is called. Typically a layout loops over the elements and calculates the ideal area to fit all the elements in. The layout sets the default size through the container's properties <code>measuredWidth</code>, <code>measuredHeight</code>, <code>measuredMinWidth,</code> and <code>measuredMinHeight</code>. Later the container may be resized to its default size depending on its particular settings as well as its parent's settings and layout. At the end, the layout's <code>updateDisplayList()</code> method will be called with the final size of the container. There are a few notable things to keep in mind:</p>
<ul>
<li> The <code>measure()</code> method is not always called. For example, in cases where the container already has explicit sizes, the measurement will be optimized away.</li>
<li> Containers that have clipping and scrolling enabled ignore the measured minimum sizes. This is because the user can scroll and view any part of the content, regardless of the container size. </li>
</ul>
<p>For the FlowLayout example, I implemented a very simplistic measurement. The <code>measure()</code> method calculates the default size for all the elements arranged horizontally in a single row. The code looks like this (it is also in the attached <kbd>FlowLayout4.as</kbd> file):</p>
</div>
</div>
<a name="articlecontentAdobe_codeblock_10" style="visibility:hidden"></a><div class="parbase codeblock compbase section"><div class="PanelFillLight PanelBevelTop LayoutCell LayoutRow">
<code class="CodeBlock">override public function measure():void
{
var totalWidth:Number = 0;
var totalHeight:Number = 0;
// loop through the elements
var layoutTarget:GroupBase = target;
var count:int = layoutTarget.numElements;
for (var i:int = 0; i &lt; count; i++)
{
// get the current element, we&#039;re going to work with the
// ILayoutElement interface
var element:ILayoutElement = useVirtualLayout ? layoutTarget.getVirtualElementAt(i) :
layoutTarget.getElementAt(i);
// In virtualization scenarios, the element returned could
// still be null. Look at the typical element instead.
if (!element)
element = typicalLayoutElement;
// Find the preferred sizes
var elementWidth:Number = element.getPreferredBoundsWidth();
var elementHeight:Number = element.getPreferredBoundsHeight();
totalWidth += elementWidth;
totalHeight = Math.max(totalHeight, elementHeight);
}
if (count &gt; 0)
totalWidth += (count - 1) * _horizontalGap;
layoutTarget.measuredWidth = totalWidth;
layoutTarget.measuredHeight = totalHeight;
// Since we really can&#039;t fit the content in space any
// smaller than this, set the measured minimum size
// to be the same as the measured size.
// If the container is clipping and scrolling, it will
// ignore these limits and will still be able to
// shrink below them.
layoutTarget.measuredMinWidth = totalWidth;
layoutTarget.measuredMinHeight = totalHeight;
}</code>
</div>
</div>
<a name="articlecontentAdobe_text_16" style="visibility:hidden"></a><div class="text parbase section"><div class="Semantic LayoutCellSides LayoutBreakAfter TextMedium TextBreak">
<p>Since the <code>horizontalGap</code> property is taken into account during measurement, changing the value should invalidate the target container size:</p>
</div>
</div>
<a name="articlecontentAdobe_codeblock_11" style="visibility:hidden"></a><div class="parbase codeblock compbase section"><div class="PanelFillLight PanelBevelTop LayoutCell LayoutRow">
<code class="CodeBlock">public function set horizontalGap(value:Number):void
{
_horizontalGap = value;
// We must invalidate the layout
var layoutTarget:GroupBase = target;
if (layoutTarget)
{
layoutTarget.invalidateSize();
layoutTarget.invalidateDisplayList();
}
}</code>
</div>
</div>
<a name="articlecontentAdobe_text_17" style="visibility:hidden"></a><div class="text parbase section"><div class="Semantic LayoutCellSides LayoutBreakAfter TextMedium TextBreak">
<p>A final note on measurement—it's a good idea to test layout measurement in bare-bone containers like Group as there are no default container sizes. Using any skinned container, like List or Panel, brings the skin's default sizes into the picture and makes testing more difficult. The sample file <kbd>FlowLayoutTestMeasure.mxml</kbd> demonstrates the FlowLayout measure logic in the context of the Group container.</p>
<h3>Where to go from here</h3>
<p>As part of Flex 4, the Spark architecture has a lot of evolutionary changes in the layout system that bring numerous new and exciting possibilities. This article merely scratches the surface of Spark layouts.</p>
<p>For more information on the stock Spark layout rules, syntax, and usage examples, the <a href="http://help.adobe.com/en_US/Flex/4.0/UsingSDK/" target="_blank">online documentation</a> is a good place to start.</p>
<p>For more information on the layout APIs, take a look at <code>LayoutBase</code>, <code>ILayoutElement,IViewport</code>, <code>Scroller</code>, <code>GroupBase</code>, <code>DataGroup</code> and the related classes in the <a href="http://help.adobe.com/en_US/AS3LCR/Flex_4.0/index.html" target="_blank">Flex 4 Language Reference</a>. Also make sure to check out <a href="http://hansmuller-flex.blogspot.com/" target="_blank">Hans Muller's blog</a> as he has excellent insights on scrolling, virtualization, layouts, and much more. You can also find custom layout topics and examples on <a href="http://evtimmy.com/" target="_blank">my blog</a>. </p>
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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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<li lang="fr"><a onClick="changeRegion('mena_fr');">Moyen-Orient et Afrique du Nord - Fran&ccedil;ais</a></li>
<li lang="nl"><a onClick="changeRegion('nl');">Nederland</a></li>
<li lang="no"><a onClick="changeRegion('no');">Norge</a></li>
<li lang="pl"><a onClick="changeRegion('pl');">Polska</a></li>
<li lang="pt"><a onClick="changeRegion('pt');">Portugal</a></li>
<li lang="ro"><a onClick="changeRegion('ro');">Rom&acirc;nia</a></li>
<li lang="ru"><a onClick="changeRegion('ru');">Россия</a></li>
<li lang="sr"><a onClick="changeRegion('rs');">Srbija</a></li>
<li lang="sk"><a onClick="changeRegion('sk');">Slovensko</a></li>
<li lang="sl"><a onClick="changeRegion('si');">Slovenija</a></li>
<li lang="es"><a onClick="changeRegion('es');">Espa&ntilde;a</a></li>
<li lang="sv"><a onClick="changeRegion('se');">Sverige</a></li>
<li lang="de"><a onClick="changeRegion('ch_de');">Schweiz - Deutsch</a></li>
<li lang="fr"><a onClick="changeRegion('ch_fr');">Suisse - Fran&ccedil;ais</a></li>
<li lang="it"><a onClick="changeRegion('ch_it');">Svizzera - Italiano</a></li>
<li lang="tr"><a onClick="changeRegion('tr');">T&uuml;rkiye</a></li>
<li lang="uk"><a onClick="changeRegion('ua');">Україна</a></li>
<li lang="en"><a onClick="changeRegion('uk');">United Kingdom</a></li>
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<ul>
<li lang="en"><a onClick="changeRegion('au');">Australia</a></li>
<li lang="zh"><a onClick="changeRegion('cn');">中国</a></li>
<li lang="zh"><a onClick="changeRegion('hk_zh');">中國香港特別行政區</a></li>
<li lang="en"><a onClick="changeRegion('hk_en');">Hong Kong S.A.R. of China</a></li>
<li lang="en"><a onClick="changeRegion('in');">India - English</a></li>
<li lang="ja"><a onClick="changeRegion('jp');">日本</a></li>
<li lang="ko"><a onClick="changeRegion('kr');">한국</a></li>
<li lang="en"><a onClick="changeRegion('nz');">New Zealand</a></li>
<li lang="zh"><a onClick="changeRegion('tw');">台灣</a></li>
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<p class="SiteFooterRegionPanelRegionHeader">Southeast Asia</p>
<ul>
<li lang="en"><a onClick="changeRegion('sea');">Includes Indonesia, Malaysia, Philippines, Singapore, Thailand, and Vietnam - English</a></li>
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