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From "Justin Mclean (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLEX-33165) RTE on Scroller when rotating device in mobile simulator
Date Thu, 25 Jul 2013 04:57:50 GMT

    [ https://issues.apache.org/jira/browse/FLEX-33165?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13719229#comment-13719229
] 

Justin Mclean commented on FLEX-33165:
--------------------------------------

OK managed to reproduce by calling method directly. Can see that this would happen if scrollbar
were removed when changing orientation and snap mode wasn't "none".


<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" 
			   xmlns:s="library://ns.adobe.com/flex/spark" 
			   xmlns:mx="library://ns.adobe.com/flex/mx" creationComplete="init(event)">
	<fx:Script>
		<![CDATA[
			import mx.core.mx_internal;
			import mx.events.FlexEvent;
			use namespace mx_internal;
			
			protected function init(event:FlexEvent):void
			{
				list.scroller.mx_internal::snapElement(10, false);
			}			
		]]>
	</fx:Script>
	<fx:Declarations>
		<s:ArrayList id="listdata">
			<fx:String>one</fx:String>
			<fx:String>two</fx:String>
			<fx:String>three</fx:String>
			<fx:String>four</fx:String>
			<fx:String>five</fx:String>
			<fx:String>six</fx:String>
			<fx:String>seven</fx:String>
			<fx:String>eight</fx:String>
			<fx:String>nine</fx:String>
			<fx:String>ten</fx:String>
			<fx:String>eleven</fx:String>
			<fx:String>twelve</fx:String>
		</s:ArrayList>
	</fx:Declarations>
	
	<s:List id="list" dataProvider="{listdata}" width="100%" height="100%" verticalScrollPolicy="off"
horizontalScrollPolicy="off" scrollSnappingMode="center">
		<s:layout>
			<s:HorizontalLayout />
		</s:layout>
	</s:List>
	
</s:Application>

                
> RTE on Scroller when rotating device in mobile simulator
> --------------------------------------------------------
>
>                 Key: FLEX-33165
>                 URL: https://issues.apache.org/jira/browse/FLEX-33165
>             Project: Apache Flex
>          Issue Type: Bug
>          Components: Spark: Scroller
>    Affects Versions: Adobe Flex SDK 4.6 (Release)
>            Reporter: Maurice Amsellem
>            Priority: Minor
>              Labels: EasyFix
>
> When rotating the mobile simulator (Menu Device>Rotate left or right), I get the following
error:
> {code}
> Error #1056: Cannot create property null on spark.components.DataGroup.
> at spark.components::Scroller/http://www.adobe.com/2006/flex/mx/internal::snapElement()[E:\dev\4.y\frameworks\projects\spark\src\spark\components\Scroller.as:1571]
> 	at spark.components::Scroller/checkScrollPosition()[E:\dev\4.y\frameworks\projects\spark\src\spark\components\Scroller.as:1750]
> 	at spark.components::Scroller/handleSizeChange()[E:\dev\4.y\frameworks\projects\spark\src\spark\components\Scroller.as:1766]
> 	at spark.components::Scroller/handleSizeChangeOnUpdateComplete()[E:\dev\4.y\frameworks\projects\spark\src\spark\components\Scroller.as:2048]
> {code}
> In Scroller:1571     viewport[scrollProperty] = snapScrollPosition;
> scrollProperty is null, which trigger the RTE.
> Scroller belongs to a spark:List with HorizontalLayout and verticalScrollPolicy style
is set to ScrollPolicy.OFF.
> also, the RTE does not seem to occur on the real device, but maybe it is just swallowed...

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