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Posted to commits@flex.apache.org by ah...@apache.org on 2014/04/26 01:35:15 UTC
[30/51] [partial] ADC articles donated by Adobe Systems Inc
http://git-wip-us.apache.org/repos/asf/flex-external/blob/1bcc0e18/ADC/devnet/flex/articles/flex4_viewport_scrolling.html
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+<!--
+ Licensed to the Apache Software Foundation (ASF) under one or more
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+ <title>Introduction to viewports and scrolling in Flex 4 | Adobe Developer Connection</title><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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+ <meta name="description" content="Learn the basics of scrolling with viewports for Spark components." /><meta name="creationDate" content="2010-09-28 @ 22:31:58" />
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+<meta name="shortTitle" content="Introduction to viewports and scrolling in Flex 4"/>
+<meta name="blurb" content="Learn the basics of scrolling with viewports for Spark components." />
+<meta name="author" content="Hans Muller" />
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+ <script src="http://community.adobe.com/help/badge/v4/ionBadge.js"></script>
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+<link rel="stylesheet" href="/apps/dotcom/ag-widgets.css" type="text/css">
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+ <a href="/" id="shHome" class="SiteHeaderHome">Adobe</a>
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+ <li class="SiteHeaderPanelLink"><a href="/marketing?promoid=JOLIT" id="Products_Topdestinations_AdobeMarketingCloud">Adobe Marketing Cloud</a></li>
+ <li class="SiteHeaderPanelLink"><a href="/products/acrobat.html?promoid=JOLIR" id="Products_Topdestinations_Acrobat">Acrobat</a></li>
+ <li class="SiteHeaderPanelLink"><a href="/products/photoshop.html?promoid=JOLIW" id="Products_Topdestinations_Photoshop">Photoshop</a></li>
+ <li class="SiteHeaderPanelLink"><a href="/products/sitecatalyst.html?promoid=KAWQH" id="Product_Topdestinationss_SiteCatalyst">SiteCatalyst</a></li>
+ <li class="SiteHeaderPanelLink"><a href="/education/students.html?marketSegment=EDU&promoid=KFKQD" id="Product_Topdestinationss_Students">Students</a></li>
+ <li class="SiteHeaderPanelLink"><a href="/products/elements-family.html?promoid=JOLIV" id="Product_Topdestinationss_Elementsfamily">Elements family</a></li>
+ </ul>
+ </div>
+ </div>
+
+ <div class="SiteHeaderColumnDouble SiteHeaderShadowLeft">
+ <div class="SiteHeaderRow">
+ <p class="SiteHeaderPanelHeader">Adobe Creative Cloud</p>
+ <ul>
+ <li class="SiteHeaderPanelLink"><a href="/products/creativecloud.html?promoid=KAUBZ" id="Products_AdobeCreativeCloud_WhatisAdobeCreativeCloud">What is Adobe Creative Cloud?</a></li>
+ </ul>
+
+ <div class="SiteHeaderColumn-1">
+ <ul>
+ <li class="SiteHeaderPanelLink"><a href="/products/creativecloud/design.html?promoid=KFKPZ" id="Products_AdobeCreativeCloud_Design">Design</a></li>
+ <li class="SiteHeaderPanelLink"><a href="/products/creativecloud/web.html?promoid=KFKQC" id="Products_AdobeCreativeCloud_Web">Web</a></li>
+ <li class="SiteHeaderPanelLink"><a href="/products/creativecloud/photography.html?promoid=KFKQA" id="Products_AdobeCreativeCloud_Photography">Photography</a></li>
+ <li class="SiteHeaderPanelLink"><a href="/products/creativecloud/video.html?promoid=KFKQB" id="Products_AdobeCreativeCloud_Video">Video</a></li>
+ <li class="SiteHeaderPanelLink"><a href="/products/creativecloud/students.html?marketSegment=EDU&promoid=JUTMG" id="Products_AdobeCreativeCloud_Students">Students</a></li>
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+ </div>
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+ <div class="SiteHeaderColumnDouble SiteHeaderShadowLeft">
+ <div class="SiteHeaderRow">
+ <p class="SiteHeaderPanelHeader">Adobe Marketing Cloud</p>
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+ <div class="SiteHeaderColumn-1">
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+ <li class="SiteHeaderPanelLink"><a href="/solutions/web-experience-management.html?promoid=KAVVX" id="Products_AdobeMarketingCloud_Webexperiencemanagement">Web experience management</a></li>
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+
+ <p class="SiteHeaderPanelHeaderSmall">Experience Manager</p>
+ <ul class="SiteHeaderPanelLinkNoBottom">
+ <li class="SiteHeaderPanelLink"><a href="/products/cq.html?promoid=KAUCQ" id="Products_ExperienceManager_CQ">CQ</a></li>
+ <li class="SiteHeaderPanelLink"><a href="/products/scene7.html?promoid=KAUCR" id="Products_ExperienceManager_Scene7">Scene7</a></li>
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+ </div>
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+ <div class="SiteHeaderColumn-2">
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+ <ul>
+ <li class="SiteHeaderPanelLink"><a href="/products/testandtarget.html?promoid=KAUCS" id="Products_Target_TestTarget">Test&Target</a></li>
+ <li class="SiteHeaderPanelLink"><a href="/products/recommendations.html?promoid=KAUCT" id="Products_Target_Recommendations">Recommendations</a></li>
+ <li class="SiteHeaderPanelLink"><a href="/products/searchandpromote.html?promoid=KAUCU" id="Products_Target_SearchPromote">Search&Promote</a></li>
+ </ul>
+
+ <p class="SiteHeaderPanelHeaderSmall">Media Optimizer</p>
+ <ul>
+ <li class="SiteHeaderPanelLink"><a href="/products/adlens.html?promoid=KAUCV" id="Products_MediaOptimizer_AdLens">AdLens</a></li>
+ <li class="SiteHeaderPanelLink"><a href="/products/audiencemanager.html?promoid=KAUCW" id="Products_MediaOptimizer_AudienceManager">AudienceManager</a></li>
+ <li class="SiteHeaderPanelLink"><a href="/products/audienceresearch.html?promoid=KAUCX" id="Products_MediaOptimizer_AudienceResearch">AudienceResearch</a></li>
+ </ul>
+
+ <p class="SiteHeaderPanelHeaderSmall">Campaign management</p>
+ <ul class="SiteHeaderPanelLinkNoBottom">
+ <li class="SiteHeaderPanelLink"><a href="/solutions/campaign-management.html?promoid=KFKQI" id="Products_Campaignmanagement_AdobeCampaign">Adobe Campaign</a></li>
+ </ul>
+ </div>
+ </div>
+ </div>
+
+ <div class="SiteHeaderColumnSingle SiteHeaderShadowLeft">
+ <div class="SiteHeaderRow">
+ <p class="SiteHeaderPanelHeader">Document services</p>
+ <ul>
+ <li class="SiteHeaderPanelLink"><a href="/products/acrobat.html?promoid=KAUCY" id="Products_DocumentServices_Acrobat">Acrobat</a></li>
+ <li class="SiteHeaderPanelLink"><a href="https://www.echosign.adobe.com/en/home.html?promoid=KAUDB" target="_blank" class="SiteHeaderLinkNewWindow" id="Products_DocumentServices_EchoSign"><span class="SiteHeaderIconNewWindowNoWrap">EchoSign<span class="SiteHeaderIconNewWindow"> [opens in a new window]</span></span></a></li>
+ <li class="SiteHeaderPanelLink"><a href="https://www.acrobat.com/formscentral/en/home.html?promoid=KAUCZ" target="_blank" id="Products_DocumentServices_FormsCentral"><span class="SiteHeaderIconNewWindowNoWrap">FormsCentral<span class="SiteHeaderIconNewWindow"> [opens in a new window]</span></span></a></li>
+ <li class="SiteHeaderPanelLink"><a href="https://www.acrobat.com/sendnow/en/home.html?promoid=KAUDA" target="_blank" id="Products_DocumentServices_SendNow"><span class="SiteHeaderIconNewWindowNoWrap">SendNow<span class="SiteHeaderIconNewWindow"> [opens in a new window]</span></span></a></li>
+ <li class="SiteHeaderPanelLink"><a href="https://www.acrobat.com/welcome/en/home.html?promoid=KAUDC" target="_blank" id="Products_DocumentServices_Acrobatcom"><span class="SiteHeaderIconNewWindowNoWrap">Acrobat.com<span class="SiteHeaderIconNewWindow"> [opens in a new window]</span></span></a></li>
+ </ul>
+
+ <p class="SiteHeaderPanelHeader">Publishing</p>
+ <ul class="SiteHeaderPanelLinkNoBottom">
+ <li class="SiteHeaderPanelLink"><a href="/products/digital-publishing-suite-family.html?promoid=JOLIU" id="Products_Publishing_DigitalPublishingSuite">Digital Publishing Suite</a></li>
+ </ul>
+ </div>
+ </div>
+ <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 & 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"> </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"> </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"> </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>
+ </div>
+ <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&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">
+ <div class="CartHeaderPopPanelShadow HoverCartwidth" id="CartPanelShadow" style="display: none;">
+ <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=""/>
+ </a>
+ </div>
+ <div style="float:left;width:100%" class="CPodCostCell">
+ <span class="TextStrong ProductName" id="HoverCartHeaderxyz">
+ <a href="#">
+ </a>
+ </span>
+ <div class="LayoutBigRowBottom" id="HoverCartDescriptionxyz">
+ </div>
+ <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>
+
+ </div>
+ </div>
+</div>
+ <div class="LayoutHItem HoverCart-2">
+ <div class="HoverCartQty">
+ Qty:
+ <span id="HoverCartQtyxyz">
+ </span>
+ </div>
+ </div>
+ <div class="LayoutRight">
+ <div class="CheckoutCostDark LayoutRight TextRight">
+ <span id="HoverCartPricexyz">
+ </span>
+ <span id="HoverCartSubscriptionxyz" class="CheckoutSubscription">
+ </span>
+ <div id="HoverCartVatPercentageLabelxyz" class="TextEm TextSmall" style="display:none; max-width: 100px;"><span id="HoverCartVatPercentagePreTextxyz"></span>
+ <span id="HoverCartVatPercentagexyz"></span></div>
+ </div>
+ </div>
+
+ </div>
+ <div class="HoverCartEDUMessage LayoutBigCellBottom" style="display:none">Purchase requires verification of academic eligibility</div>
+ </div>
+ <div id="HoverCartContainer" class="LayoutBreakAfter" style=""></div>
+ <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%">
+ <tr>
+ <td>
+ <div class="TextRight HoverCartSubTotal">Subtotal</div>
+ <div id="ExVatLabel" style="display:none" class="TextEm TextSmall TextRight"></div>
+ </td>
+ <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>
+ </td>
+ <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>
+ </td>
+ <td>
+ <div class="LayoutRight TextRight">
+ <div class="CheckoutCostDark">
+ <span id="HoverCartVat">
+ </span>
+ </div>
+ <div id="CartTaxHeader">
+ Calculated at checkout</div>
+ </div>
+ </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>
+ </tr>
+ </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 = {
+
+ CountryCode: "US",
+
+ 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">
+ Introduction to viewports and scrolling in Flex 4</h1>
+ </div>
+ </div>
+</div>
+<div class="LayoutRow Link RuleH">
+ <div class="LayoutBreakAfter">
+ <!-- Article Leaf -->
+ <div class="ArticleGrid-1 LayoutSlimGrid-1-2 ArticleWideGrid-1 TextSmall">
+ <div class="LayoutCellSides LayoutRow">
+ <div class="articleAuthorDisplay authordisplay"><h2 class="TextH5 LayoutRow">
+ by <a href="/devnet/author_bios/hans_muller.html">Hans Muller</a></h2>
+ <div class="LayoutRow">
+ <img title="" alt="Hans Muller" class="ImageShadow LayoutImage" src="/content/dotcom/en/devnet/author_bios/hans_muller/_jcr_content/image.adimg.mw.160.jpg/1296462979942.jpg"/></div>
+ <div class="LayoutRow">
+ <ul>
+ <li><a href="http://hansmuller-flex.blogspot.com/" title="hansmuller-flex.blogspot.com" target="_blank">hansmuller-flex.blogspot.com</a></li>
+ </ul>
+ </div>
+ </div>
+</div>
+ <div class="LayoutCellSides LayoutRow">
+ <div class="parbase compbase articleTOC singlepagetoc"><div class="LayoutRow">
+ <h2 class="TextH5 LayoutSmallRow">Content</h2>
+ <ul class="LayoutSmallRow">
+ <li class="LayoutSmallRow ListItemIndent">
+ <a href="#articlecontentAdobe_numberedheader">
+ Scrolling and viewports overview</a>
+ </li>
+ <li class="LayoutSmallRow ListItemIndent">
+ <a href="#articlecontentAdobe_numberedheader_0">
+ The Scroller class</a>
+ </li>
+ <li class="LayoutSmallRow ListItemIndent">
+ <a href="#articlecontentAdobe_numberedheader_1">
+ The IViewport interface and classes</a>
+ </li>
+ <li class="LayoutSmallRow ListItemIndent">
+ <a href="#articlecontentAdobe_numberedheader_2">
+ Comparison with MX scrolling</a>
+ </li>
+ </ul>
+ </div>
+
+ </div>
+</div>
+ <div class="LayoutCellSides LayoutRow">
+ <div class="articleTools articletools"><div class="LayoutRow LayoutCellVSides">
+ <h2 class="TextH5 LayoutSmallRow">Modified</h2>
+ <p>8 March 2010</p>
+ </div>
+ <ul class="LayoutRow">
+ </ul>
+ </div>
+</div>
+ <div class="LayoutRow">
+ <div class="articleCommentSummary commentsummary"><div class="LayoutRow LayoutCellSides">
+ <div id="articleRankAndCommentSummary"></div>
+</div>
+</div>
+</div>
+ <div class="LayoutRow">
+ <!-- Page Tools -->
+ <div class="pagetools pageTools"><div class="LayoutBreakAfter">
+ <div class="LayoutRow LayoutBreakAfter TextH5">
+ <table class="LayoutMaxH">
+ <tbody>
+ <tr>
+ <td class="PanelFillDark">
+ <h2 class="TextH5 LayoutCellSides LayoutSmallCellVSides">
+ Page tools</h2>
+ </td>
+ </tr>
+ </tbody>
+ </table>
+</div>
+<div class="LayoutCellSides">
+ <div class="LayoutRow">
+ <div id="PageTools" style="padding-left:23px;" class=" LayoutBreakAfter LayoutPullout">
+ <div class="LayoutSmallRowBottom LayoutBreakAfter">
+ <div style="width:16px;float:left;clear:left;position:relative;left:-23px;margin-right:-23px">
+ <a class="Facebook-button Icon IconFacebook" href="http://www.facebook.com/sharer.php"></a>
+ </div>
+ <div style="float:left;width:100%">
+ <a href="http://www.facebook.com/sharer.php" class="Facebook-button" title="Share on Facebook" target="_blank">Share on Facebook</a></div>
+ </div>
+ <div class="LayoutSmallRowBottom LayoutBreakAfter">
+ <div style="width:16px;float:left;clear:left;position:relative;left:-23px;margin-right:-23px">
+ <a class="Twitter-button Icon IconTwitter" href="http://twitter.com/"></a>
+ </div>
+ <div style="float:left;width:100%">
+ <a href="http://twitter.com/" class="Twitter-button" title="Share on Twitter" target="_blank">Share on Twitter</a></div>
+ </div>
+ <div class="LayoutSmallRowBottom LayoutBreakAfter">
+ <div style="width:16px;float:left;clear:left;position:relative;left:-23px;margin-right:-23px">
+ <a class="LinkedIn-button Icon IconLinkedIn" href="http://www.linkedin.com/"></a>
+ </div>
+ <div style="float:left;width:100%">
+ <a href="http://www.linkedin.com/" class="LinkedIn-button" title="Share on LinkedIn" target="_blank">Share on LinkedIn</a></div>
+ </div>
+ <div class="LayoutSmallRowBottom LayoutBreakAfter">
+ <div style="width:16px;float:left;clear:left;position:relative;left:-23px;margin-right:-23px">
+ <a class="Bookmark-button Icon IconBookmark" href="#"></a>
+ </div>
+ <div style="float:left;width:100%">
+ <a class="Bookmark-button" href="#">Bookmark</a>
+ </div>
+ </div>
+ <div class="LayoutSmallRowBottom LayoutBreakAfter">
+ <div style="width:16px;float:left;clear:left;position:relative;left:-23px;margin-right:-23px">
+ <a class="Print-button Icon IconPrint" href="#"></a>
+ </div>
+ <div style="float:left;width:100%">
+ <a class="Print-button" href="#">Print</a>
+ </div>
+ </div>
+ </div>
+</div>
+ </div>
+ </div>
+</div>
+</div>
+ <div class="LayoutCellSides LayoutRow">
+ <!-- Article Community -->
+ <div class="articletags articleTags"><div class="LayoutRow">
+ <div class="LayoutH LinkWeak TextTag">
+ <a href="/devnet/tagsearch.tsb.prod-_sl_flex_v_.tse.html" class="LayoutHItem LayoutHItem PanelFillMedium LayoutSmallGutterRight LayoutSmallRow LayoutSmallCellSides" title="Flex">Flex</a></div>
+ </div>
+ </div>
+</div>
+ <div class="LayoutCellSides LayoutRow">
+ <div class="parbase adcFeedBack compbase adcfeedback"><script type="javascript">
+ //<![CDATA[
+ s_tagEnv = 'dev';
+ //]]>
+ </script>
+ <script src="http://wwwimages.adobe.com/www.adobe.com/include/script/article-compressed.js"></script>
+
+ <div id="helpful-pod">
+ <div id="helpful" class="collapsed">
+ <div id="helpfulspan">Was this helpful?</div>
+ <input type="radio" name="feedback" id="radioyes" onClick="showForm();"/><span id="yesspan" class="radio-option">Yes</span>  
+ <input type="radio" name="feedback" id="radiono" onClick="showForm();"/><span id="nospan" class="radio-option">No</span>
+ <textarea title="(Optional) Please let us know how we can improve this page. " id="feedbacktext" placeholder="" rows="5" cols="25" style="font-family:sans-serif;display:none"></textarea>
+ <button id="submitButton" onClick="submitForm();" style="display:none">Submit</button>
+ <button id="noCommentButton" onClick="hideForm();" style="display:none">No comment</button>
+ <br clear="both">
+ <div id="termsofuse"><p>By clicking Submit, you accept the <a href="/misc/terms.html">Adobe Terms of Use</a>.</p>
+</div>
+ </div>
+ <div id="fold"> </div>
+ </div>
+ <div id="helpful-thankyou" class="thankyou">Thanks for your feedback.</div>
+
+ <script>
+ //<![CDATA[
+ // Send CHL-specific data to SiteCatalyst
+ var s_chl = s_gi("mxchlprod");
+ var urlMatch = /(https?:\/\/)([-\w\.]+)+(:\d+)?(\/([\w\/_\.]*))(index.html)?(\?\S+)?(#\S+)?/;
+ var adobeMatch = /(https?:\/\/)([-\w\.]+)+(\.adobe\.com)/;
+ var adobeLocaleMatch = /^\/(ae|bg|cz|dk|de|gr|es|ee|fi|fr|il|hr|hu|it|jp|kr|lt|lv|no|nl|pl|br|ro|ru|sk|si|se|tr|ua|cn|tw)\/.+/;
+ var cqLocaleMatch = /^\/content\/help\/(ae|bg|cz|dk|de|gr|es|ee|fi|fr|il|hr|hu|it|jp|kr|lt|lv|no|nl|pl|br|ro|ru|sk|si|se|tr|ua|cn|tw)\/.+/;
+ var ua = navigator.userAgent.toLowerCase();
+ s_chl.channel = "helpx";
+ s_chl.eVar3 = window.location.toString().replace(/[\?,#](.*)/, "");
+ s_chl.pageName = s_chl.eVar11 = document.title;
+ if ( typeof(omtrPageName) != 'undefined' && omtrPageName.length > 0 ) {
+ s_chl.pageName = s_chl.eVar11 = omtrPageName;
+ }
+ // s_chl.list1 = omtrProductList.replace(/,/g,":");
+ var omtrLocale = "en";
+ if (adobeLocaleMatch.test(location.pathname)) {
+ var matchArray = adobeLocaleMatch.exec(location.pathname).slice();
+ omtrLocale = matchArray[1];
+ if ( typeof(matchArray[1]) != 'undefined') {
+ omtrLocale = matchArray[1];
+ }
+ }
+ else if (cqLocaleMatch.test(location.pathname)) {
+ var matchArray = cqLocaleMatch.exec(location.pathname).slice();
+ omtrLocale = matchArray[1];
+ if ( typeof(matchArray[1]) != 'undefined') {
+ omtrLocale = matchArray[1];
+ }
+ }
+
+ s_chl.eVar8 = omtrLocale;
+ if (omtrLocale != "en") {
+ s_chl.eVar9 = document.title;
+ }
+ // Transmit
+ // The s_gs() call in compressed.js causes problems with any .t() call in any report suite
+ function s_gs(){}
+ s_chl.t();
+
+ function showForm(){
+ if (ua.indexOf('msie 6') == -1 ){
+ $('#helpfulspan').hide();
+ $('#radioyes').hide();
+ $('#radiono').hide();
+ $('#yesspan').hide();
+ $('#nospan').hide();
+ $('#feedbacktext').autofill();
+ $('#helpful').animate({width:'420px', height: '185px'});
+ $('#helpful').removeClass('collapsed');
+ $('#helpful').addClass('expanded');
+ $('#fold').css('background-position', '-12px 0');
+ displayTextField();
+ }else{
+ submitForm();
+ }
+ }
+
+
+
+ $(document).ready(function() {
+ var feedbackLocales = "en, jp, fr, de, it, se, es, nl , dk, br, no, fi";
+ if ( feedbackLocales.indexOf( omtrLocale ) > -1 ){
+ $('#helpful-pod').fadeIn();
+ $('#helpful-pod').animate({
+ opacity: 1,
+ top: '+=20'},
+ 1500);
+ }
+ });
+
+ // ]]>
+ </script>
+ </div>
+</div>
+ <div class="LayoutBreak"></div>
+ </div>
+ <!-- Main Content -->
+ <div class="LayoutSlimGrid-1-2 ArticleGrid-2-4 ArticleWideGrid-2-6">
+ <div class="ArticleWideGrid-2-4">
+ <div class="articlerequirements articlePrerequistes"><div class="PanelFillMedium PanelBorder LayoutRow TextSmall">
+ <div id="requirements-title" class="LayoutCell Link">
+ <h2 class="TextH5">
+ <span class="LayoutSmallGutterRight Icon IconSmallerAdd"></span>
+ Requirements</h2>
+ </div>
+ <div id="requirements-content" class="LayoutBreakAfter">
+ <div class="ArticleGrid-2">
+ <div class="LayoutCellSides">
+ <h3 class="TextH5 LayoutSmallRowTop">
+ Prerequisite knowledge</h3>
+ <div class="LayoutRowBottom">
+ <p>Familiarity with ActionScript, Flex 3, and basic 2D graphics concepts will be helpful in understanding the concepts discussed in this article.</p>
+</div>
+ <h3 class="TextH5 LayoutSmallRowTop">
+ User Level</h3>
+ <p class="LayoutRowBottom">Intermediate</p>
+ </div>
+ </div>
+ <div class="ArticleGrid-3">
+ <div class="LayoutCellSides">
+ <h3 class="TextH5 LayoutSmallRowTop">
+ Required products</h3>
+ <ul class="LayoutSmallRowTop LayoutRowBottom">
+ <li class="LayoutSmallRow">
+ <span class="IconLeft IconSmallDownload"></span>Flex<a href="/go/tryflex/"> (Download trial)</a></li>
+ <li class="LayoutSmallRow">
+ <span class="IconLeft IconSmallDownload"></span>Flex Builder<a href="/go/tryflashbuilder/"> (Download trial)</a></li>
+ </ul>
+ </div>
+ </div>
+ <div class="ArticleGrid-4">
+ <div class="LayoutCellSides">
+ <h3 class="TextH5 LayoutSmallRowTop">
+ Sample files</h3>
+ <ul class="LayoutSmallRowTop LayoutRowBottom">
+ <li class="LayoutSmallRow"><a href="/content/dotcom/en/devnet/flex/articles/flex4_viewport_scrolling/_jcr_content/articlePrerequistes/multiplefiles/node_1275043822981/file.res/flex4_viewport_scrolling.zip"><span class="LayoutSmallGutterRight Icon IconSmallDownload"></span>flex4_viewport_scrolling.zip</a>
+ (1 KB)</li>
+ <ul class="LayoutGutterLeft"><li class="LayoutGutterLeft">
+ </li></ul>
+ </ul>
+ </div>
+ </div>
+ </div>
+ </div>
+ <script>
+ adobe.fn.panelToggle("requirements-title", "requirements-content", true);
+</script>
+<script>
+ adobe.fn.panelToggle("requirements-title", "requirements-content", true);
+</script>
+</div>
+<div class="LayoutGrid-1-4 LayoutSlimGrid-1-2 LayoutBreakAfter">
+ <div class="parsys articlecontentAdobe"><div id="articlecontentAdobe">
+<a name="articlecontentAdobe_text_4" style="visibility:hidden"></a><div class="text parbase section"><div class="Semantic LayoutCellSides LayoutBreakAfter TextMedium TextBreak">
+ <p>Flex 4 provides an interface called IViewport that all scrollable components must implement, and Scroller, a component that uses scrollbars to enable interactive scrolling of a viewport (a component that implements IViewport). This support for interactive scrolling is an essential feature of all graphical user interface (GUI) toolkits. The Flex 4 approach is intended to be more efficient than the one used in Flex 3; see the section <a href="#articlecontentAdobe_numberedheader_2">Comparison with MX scrolling</a> for more details.</p>
+<p>Many Flex components, including List and TextArea, include a Scroller and a viewport as part of their skin, so that developers don’t have to worry about enabling scrolling. This article explains how the IViewport interface works and includes a simple Scroller example. If you’re interested in creating your own interactive scrolling components or just want a better understanding of how Flex 4 scrolling works, read on.</p>
+</div>
+ </div>
+<a name="articlecontentAdobe_numberedheader" style="visibility:hidden"></a><div class="parbase compbase numberedheader section"><h3 class="TextH3 LayoutCellSides LayoutRow">
+ <a id="articlecontentAdobe_numberedheader"></a>
+ Scrolling and viewports overview</h3>
+</div>
+<a name="articlecontentAdobe_text" style="visibility:hidden"></a><div class="text parbase section"><div class="Semantic LayoutCellSides LayoutBreakAfter TextMedium TextBreak">
+ <p>GUIs use scrolling to display a document that is bigger than the space available on the user’s screen.</p>
+<p>In Spark (the new component and skinning architecture in Flex 4), the IViewport interface defines a way to scroll a small rectangular clipping window that exposes a large document a little bit at a time. In this context scrolling refers to moving the origin of the little clipping window relative to the large document.</p>
+<p>The Spark Scroller component provides a conventional GUI for scrolling a viewport interactively. It displays a pair of vertical and horizontal scrollbars whose thumb positions define the X and Y origin of the clipping rectangle. By default, the scrollbars are only shown when they are needed.</p>
+<p>Figure 1 shows the basic geometry of the situation in terms of IViewport properties: width, height, contentWidth, contentHeight, horizontalScrollPosition, verticalScrollPosition.</p>
+</div>
+ </div>
+<a name="articlecontentAdobe_textimage" style="visibility:hidden"></a><div class="parbase textimage section"><div class="LayoutBreakAfter">
+ <div class="image ">
+ <img title="" alt="file" class="cq-dd-image" src="/content/dotcom/en/devnet/flex/articles/flex4_viewport_scrolling/_jcr_content/articlecontentAdobe/textimage/image.img.jpg/1275519054344.jpg"><br/>
+ <div class="TextSmall LayoutRow">Figure 1. IViewport geometry and relevant properties.</div>
+ </div>
+ </div>
+ </div>
+<a name="articlecontentAdobe_text_5" style="visibility:hidden"></a><div class="text parbase section"><div class="Semantic LayoutCellSides LayoutBreakAfter TextMedium TextBreak">
+ <p>The viewport’s contentWidth and contentHeight properties define the horizontal and vertical extents of whatever is drawn in the viewport, that is, the viewport’s content. The viewport’s width and height properties define the size of the visible subset of the content, that is, the size of what appears on the screen and the size of the viewport’s clipping rectangle. The horizontalScrollPosition and verticalScrollPosition properties define the origin of the clipping rectangle. Applications can scroll a viewport by modifying these properties.</p>
+</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>
+ The Scroller class</h3>
+</div>
+<a name="articlecontentAdobe_text_0" style="visibility:hidden"></a><div class="text parbase section"><div class="Semantic LayoutCellSides LayoutBreakAfter TextMedium TextBreak">
+ <p>The Spark Scroller class is a container for a single viewport, like a Group or a DataGroup.</p>
+<p>A Scroller displays vertical and horizontal scrollbars whose values are bound to the viewport's horizontalScrollPosition and verticalScrollPosition properties. The size of the scrollbar thumbs and the maximum limit for their values are based on the relative size of the viewport's content, as specified by contentWidth and contentHeight.</p>
+<p>The code below is a simple example of the Scroller class. The Scroller's viewport is a Group, which contains an Image that is displayed in the center of the viewport.</p>
+</div>
+ </div>
+<a name="articlecontentAdobe_codeblock" style="visibility:hidden"></a><div class="parbase codeblock compbase section"><div class="PanelFillLight PanelBevelTop LayoutCell LayoutRow">
+ <code class="CodeBlock"><?xml version="1.0" encoding="utf-8"?>
+<s:Application backgroundColor="0x000000"
+ xmlns:s="library://ns.adobe.com/flex/spark"
+ xmlns:mx="library://ns.adobe.com/flex/mx">
+ <s:Scroller left="1" right="1" top="1" bottom="1">
+ <s:Group>
+ <mx:Image source="guyrobot.jpg"
+ horizontalCenter="0"
+ verticalCenter="0">/
+ </s:Group>
+ </s:Scroller>
+</s:Application></code>
+ </div>
+</div>
+<a name="articlecontentAdobe_text_1" style="visibility:hidden"></a><div class="text parbase section"><div class="Semantic LayoutCellSides LayoutBreakAfter TextMedium TextBreak">
+ <p>Here is a working version of the application:</p>
+<div id="swf" class="swfcontent"><embed height="200" width="350" type="application/x-shockwave-flash" src="http://wwwimages.adobe.com/www.adobe.com/devnet/flex/articles/flex4_viewport_scrolling/flex4_viewport_scrolling.swf" id="swfmovie" name="swfmovie" bgcolor="#ffffff" quality="high" wmode="opaque"></embed></div>
+</div>
+ </div>
+<a name="articlecontentAdobe_text_6" style="visibility:hidden"></a><div class="text parbase section"><div class="Semantic LayoutCellSides LayoutBreakAfter TextMedium TextBreak">
+ <p>The working version has been modified to display the current values of the various viewport properties. You can <a target="_blank" href="http://download.macromedia.com/pub/developer/flex4_viewport_scrolling.mxml">download</a> the source code for this version of the example.</p>
+<p>By default the Scroller displays its scrollbars when they’re needed–when the viewport’s content size is larger than its actual size. You can change this policy with the verticalScrollPolicy and horizontalScrollPolicy properties. The default value for these properties, auto, causes the scrollbars to display as needed. Set these properties to on to unconditionally display a scrollbar, and off to unconditionally hide a scrollbar.</p>
+</div>
+ </div>
+<a name="articlecontentAdobe_numberedheader_1" style="visibility:hidden"></a><div class="parbase compbase numberedheader section"><h3 class="TextH3 LayoutCellSides LayoutRow">
+ <a id="articlecontentAdobe_numberedheader_1"></a>
+ The IViewport interface and classes</h3>
+</div>
+<a name="articlecontentAdobe_text_2" style="visibility:hidden"></a><div class="text parbase section"><div class="Semantic LayoutCellSides LayoutBreakAfter TextMedium TextBreak">
+ <p>The basic Spark container classes are called Group and DataGroup, and they share a common base class called GroupBase. GroupBase implements IViewport, so anything you can create within a Group or a DataGroup can be displayed in a Scroller, since Scroller just requires its viewport to implement IViewport.</p>
+<p>Most of the IViewport interface should look familiar to you based on the discussion so far:</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">public interface IViewport extends IVisualElement {
+ function get width():Number;
+ function get height():Number;
+ function get contentWidth():Number;
+ function get contentHeight():Number;
+ function get horizontalScrollPosition():Number;
+ function set horizontalScrollPosition(value:Number):void;
+ function get verticalScrollPosition():Number;
+ function set verticalScrollPosition(value:Number):void;
+ function getHorizontalScrollPositionDelta(scrollUnit:uint):Number;
+ function getVerticalScrollPositionDelta(scrollUnit:uint):Number;
+ function get clipAndEnableScrolling():Boolean;
+ function set clipAndEnableScrolling(value:Boolean):void;
+}</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>A viewport's width and height are its actual width and height and its contentWidth and contentHeight are the maximum X and Y extent of its contents. For example, if a viewport contained a rectangle (a spark.primitives.Rect object) with its origin at 10,20 and its width and height set at 100, then the viewport's contentWidth would be 110 and its contentHeight would be 120. In the example above, the image's origin is 0,0 (the default) and so the Group's contentWidth and contentHeight are the same as the image's width and height, respectively.</p>
+<p>The Boolean clipAndEnableScrolling property turns support for scrolling on and off. If it’s false, then the viewport does not clip its content and the scroll positions do not control scrolling. The GroupBase class defines clipAndEnableScrolling to be false by default so if you’re building a custom scrolling container you must explicitly set this property to true. Scroller sets cllipAndEnableScrolling=true for its viewport automatically. Scrolling is disabled by default because turning it on causes memory to be allocated for the visible part of the viewport and because text and graphics that are supposed to fit within a viewport’s bounds sometimes stray just a little bit outside due to numerical factors and antialiasing.</p>
+<p>The getHorizontalScrollPositionDelta and getVerticalScrollPositionDelta methods of the IViewport interface compute the distance to needed to scroll by a line or a page. These methods are used to compute the distance to be scrolled when the user clicks a Scroller's scrollbar track or up/down buttons, rolls the mouse wheel, or presses the Page Up, Page Down, or Arrow keys on the keyboard.</p>
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+ Comparison with MX scrolling</h3>
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+ <p>The Spark viewport and scrolling API is similar to the one provided by MX. The fundamental container classes (Container in MX, Group and DataGroup in Spark) are capable of scrolling. Unlike Spark, in MX all containers have scrolling enabled by default, and there’s no need to use a special scrolling container to add scrollbars. In MX, if a container’s contents extend beyond its bounds, scrollbars appear according to the container’s scrollPolicy property.</p>
+<p>The changes in Spark were motivated by a desire to reduce the size and complexity of typical applications. Most containers in most applications don't need scrollbars or scrolling and there's a cost in complexity and footprint for giving all containers that ability in MX. The policy in Flex 4 beta is sometimes referred to as pay as you go, which is to say that your application's footprint and performance should reflect just the SDK features that you need.</p>
+<h3>Where to go from here</h3>
+<p>There is a great deal more to be said about how the IViewport interface and Scroller class can be used and extended. I occasionally post on this topic <a target="_blank" href="http://hansmuller-flex.blogspot.com/">on my blog</a>. For more information on the stock Spark layout rules, syntax, and usage examples, the <a target="_blank" href="http://help.adobe.com/en_US/Flex/4.0/UsingSDK/">online documentation</a> is a good place to start.</p>
+<p>For more information on the viewport and scrolling APIs, take a look at IViewport, Scroller, GroupBase, Group, DataGroup, and the rest of the classes in the <a target="_blank" href="http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/">ActionScript 3.0 Reference for the Adobe Flash Platform</a>. Also be sure to check out <a target="_blank" href="http://evtimmy.com/">Evtim Georgiev's blog</a>, which covers closely related topics like layout and virtualization.</p>
+<p>And there’s also a video. If you're inte
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