[FLEX-33722] Dragging a row with an itemRenderer which extends DefaultGridItemRenderer causes null pointer in mx.utils::MatrixUtil$/isDeltaIdentity()

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Apache Flex 4.10.0
• Fix Version/s: Apache Flex 4.11.0
• Component/s: Drag and Drop, Spark: DataGrid
• Labels: datagrid drag itemrenderer nullpointerexception
• Assignee: Justin Mclean
• Reporter: Marcus Wilkinson
• Created: 09/Sep/13 15:44
• Updated: 16/Sep/13 01:13
• Resolved: 16/Sep/13 01:13

Description

See attached for an example. I think this is down to two things:

https://github.com/apache/flex-sdk/blob/develop/frameworks/projects/spark/src/spark/components/gridClasses/DataGridDragProxy.as
element.getLayoutMatrix() is returning null. Doing a check for a null matrix, and returning an identity matrix seems to help

https://github.com/apache/flex-sdk/blob/develop/frameworks/projects/spark/src/spark/components/gridClasses/DataGridDragProxy.as#L201

I think this should be inside the loop, (at line 198)

Issue Links

• is related to: FLEX-33705 DataGridDragProxy created item renderer without a reference to the column