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