Tamás Nepusz created FLEX-34210:
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Summary: RTE in GridColumnHeaderGroup when the user clicks on the
header of a DataGrid with no columns
Key: FLEX-34210
URL: https://issues.apache.org/jira/browse/FLEX-34210
Project: Apache Flex
Issue Type: Bug
Components: Spark: Grid
Affects Versions: Apache Flex 4.12.0, Apache Flex 4.11.0
Environment: Mac OS X 10.9.2; probably affects all other platforms as
well
Reporter: Tamás Nepusz
Priority: Minor
Steps to reproduce:
1. Create a new WindowedApplication with a single DataGrid in it. The DataGrid
should not have columns or a data provider.
2. Start the application.
3. Click on the header row of the DataGrid, anywhere above the thin black
separator line within the component)
Observed result:
TypeError: Error #1009: Cannot access a property or method of a null object
reference.
at
spark.components::GridColumnHeaderGroup/getHeaderRendererAt()[/Users/justinmclean/Documents/ApacheFlex4.11.0/frameworks/projects/spark/src/spark/components/GridColumnHeaderGroup.as:921]
at
spark.components::GridColumnHeaderGroup/dispatchGridEvent()[/Users/justinmclean/Documents/ApacheFlex4.11.0/frameworks/projects/spark/src/spark/components/GridColumnHeaderGroup.as:1266]
at
spark.components::GridColumnHeaderGroup/gchg_mouseDownDragUpHandler()[/Users/justinmclean/Documents/ApacheFlex4.11.0/frameworks/projects/spark/src/spark/components/GridColumnHeaderGroup.as:1112]
at
Function/<anonymous>()[/Users/justinmclean/Documents/ApacheFlex4.11.0/frameworks/projects/spark/src/spark/utils/MouseEventUtil.as:104]
Expected result:
Nothing should have happened.
The problem lies in GridColumnHeaderGroup.getHeaderRendererAt() where
getColumnHeaderViewAtIndex() returns null, which is not anticipated by the line
immediately below it. Note that several other methods in GridColumnHeaderGroup
have the same problem (e.g., getHeaderBounds).
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