Mihai Chira created FLEX-34065:
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Summary: AdvancedDataGrid throws RTE #1009 when groupedColumns is
set to null
Key: FLEX-34065
URL: https://issues.apache.org/jira/browse/FLEX-34065
Project: Apache Flex
Issue Type: Bug
Components: Advanced Data Grid
Affects Versions: Apache Flex 4.11.0
Reporter: Mihai Chira
Fix For: Apache Flex 4.12.0
Steps to reproduce: when run, the following application throws "Error #1009:
Cannot access a property or method of a null object reference. at
mx.controls::AdvancedDataGridBaseEx/commitProperties()..."
<?xml version="1.0" encoding="utf-8"?>
<s:WindowedApplication xmlns:mx="library://ns.adobe.com/flex/mx"
xmlns:fx="http://ns.adobe.com/mxml/2009";
xmlns:s="library://ns.adobe.com/flex/spark">
<mx:AdvancedDataGrid>
<mx:groupedColumns/>
</mx:AdvancedDataGrid>
</s:WindowedApplication>
Notes:
* in our application this is happening because OLAPDataGrid.commitProperties()
sets "groupedColumns = []" when there are no column axes in the olap data.
* because AdvancedDataGrid relies on visibleHeaderInfos being null in some
cases (see .drawHeaderHorizontalSeparators()), it seems that the assumption
made by AdvancedDataGridBaseEx.commitProperties() - that visibleHeaderInfos
cannot be null - is the one that needs to be changed. So the monkey patch we
wrote until we have a fix in the framework replaces
if (horizontalScrollPosition > visibleHeaderInfos.length)
horizontalScrollPosition = visibleHeaderInfos.length - 1;
...with
var noVisibleColumns:int = visibleHeaderInfos ? visibleHeaderInfos.length : 0;
if (horizontalScrollPosition > noVisibleColumns)
horizontalScrollPosition = noVisibleColumns == 0 ?
noVisibleColumns : noVisibleColumns - 1;
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