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https://issues.apache.org/jira/browse/FLEX-26890?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13502725#comment-13502725
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Victor Sheyanov commented on FLEX-26890:
----------------------------------------
Hi guys!
More than one year passed after the issues was reported. Recently I've found
workaround for this issue.
First, you need update you textflow by adding all new graphics elements. Than,
before scrolling down, you need to updateAllControllers();
During this updateAllControllers, exception is thrown and you catch it.
try
{
textFlow.flowComposer.updateAllControllers();
}
catch(error:Error)
{
}
chatText.verticalScrollPosition = chatText.contentHeight - chatText.height;
Original issues comes from ContainerController.as, line 3178, updateGraphics
method.
During debugging I've sorted out, that for this line we come with floatIndex =
1. After that we do floatIndex--, and floatIndex is equals to 0, and after that
we are trying to do floatInfo=_composedFloats[-1]; and of course we get
floatInfo == null, and on the last line we do null.graphics and we get an
exception.
while (containerListIndex == -1 && floatIndex > 0)
{
floatIndex--;
floatInfo = _composedFloats[floatIndex - 1];
containerListIndex = _floatsInContainer.indexOf(floatInfo.graphic);
}
> [TLF 2819924] Error #1009 in
> flashx.textLayout.container::ContainerController::updateGraphics() while
> setting vscrollbar to maximum
> -----------------------------------------------------------------------------------------------------------------------------------
>
> Key: FLEX-26890
> URL: https://issues.apache.org/jira/browse/FLEX-26890
> Project: Apache Flex
> Issue Type: Bug
> Components: Spark: TextArea
> Affects Versions: Adobe Flex SDK Previous
> Environment: Affected OS(s): Windows
> Affected OS(s): Windows 7
> Browser: Internet Explorer 8.x
> Language Found: English
> Reporter: Adobe JIRA
> Priority: Minor
>
> Steps to reproduce:
> I found this issue while trying to do a test case for another issue. But the
> origin of the problem seems to be the same.
> Actual Results:
> While clicking on Tab 2 and on the button "Click me" several times, the
> application throws a TypeError :
> TypeError: Error #1009: Cannot access a property or method of a null object
> reference.
> at
> flashx.textLayout.container::ContainerController/http://ns.adobe.com/textLayout/internal/2008::updateGraphics()[C:\Vellum\branches\v2\2.0\dev\output\openSource\textLayout\src\flashx\textLayout\container\ContainerController.as:3180]
> at
> flashx.textLayout.container::ContainerController/http://ns.adobe.com/textLayout/internal/2008::updateCompositionShapes()[C:\Vellum\branches\v2\2.0\dev\output\openSource\textLayout\src\flashx\textLayout\container\ContainerController.as:3078]
> at
> flashx.textLayout.compose::StandardFlowComposer/updateCompositionShapes()[C:\Vellum\branches\v2\2.0\dev\output\openSource\textLayout\src\flashx\textLayout\compose\StandardFlowComposer.as:616]
> at
> flashx.textLayout.compose::StandardFlowComposer/updateToController()[C:\Vellum\branches\v2\2.0\dev\output\openSource\textLayout\src\flashx\textLayout\compose\StandardFlowComposer.as:559]
> at
> flashx.textLayout.compose::StandardFlowComposer/updateAllControllers()[C:\Vellum\branches\v2\2.0\dev\output\openSource\textLayout\src\flashx\textLayout\compose\StandardFlowComposer.as:517]
> at
> flashx.textLayout.container::TextContainerManager/updateContainer()[C:\Vellum\branches\v2\2.0\dev\output\openSource\textLayout\src\flashx\textLayout\container\TextContainerManager.as:1343]
> at
> spark.components::RichEditableText/updateDisplayList()[E:\dev\hero_private\frameworks\projects\spark\src\spark\components\RichEditableText.as:2886]
> at
> mx.core::UIComponent/validateDisplayList()[E:\dev\hero_private\frameworks\projects\framework\src\mx\core\UIComponent.as:8951]
> at
> mx.managers::LayoutManager/validateDisplayList()[E:\dev\hero_private\frameworks\projects\framework\src\mx\managers\LayoutManager.as:736]
> at
> mx.managers::LayoutManager/doPhasedInstantiation()[E:\dev\hero_private\frameworks\projects\framework\src\mx\managers\LayoutManager.as:819]
> at
> mx.managers::LayoutManager/doPhasedInstantiationCallback()[E:\dev\hero_private\frameworks\projects\framework\src\mx\managers\LayoutManager.as:1180]
>
> Expected Results:
> I expect the VScrollBar to be set at its maximum value when TextArea is
> updated.
>
> Workaround (if any):
> Not found yet...
>
> At the beginning, I was trying to isolate this runtime TypeError :
> http://paste.balbinus.org/788 which is due to my updateVScroll() too.
> Sorry if this test case is not perfect :x
> Note : This bug doesn't happen in the Flex 4.1 SDK, I'm using the Flex
> 4.5.0.19786.
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