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https://issues.apache.org/jira/browse/FLEX-34741?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14648005#comment-14648005
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Alex Harui commented on FLEX-34741:
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Please post a simple MXML file that exhibits the problem.
> Spark DataGrid Drag and Drop non functioning
> --------------------------------------------
>
> Key: FLEX-34741
> URL: https://issues.apache.org/jira/browse/FLEX-34741
> Project: Apache Flex
> Issue Type: Bug
> Components: Spark: DataGrid
> Affects Versions: Apache Flex 4.14.0
> Reporter: Devin
> Labels: drag&drop
>
> Description
> Dropping a dragged item onto the grid does not work. When calculating the
> DropLocation (in dragEnter, dragOver, dragDrop handlers) it falls through to
> LayoutBase.calculateDropIndex which simply executes "return
> target.numElements;" That's clearly not how the dropIndex should be
> calculated on the grid. The GridLayout class should be overriding this method
> and calculating it correctly.
> Furthermore, upon trying to fix this issue (which is more complicated than it
> should be because DataGrid.calculateDropPosition() is marked as private) the
> DataGrid.calculateDropPosition() does not perform a null check on the
> DropLocation (which is valid value).
> Steps to Reproduce
> 1. Create a DataGrid with dragEnabled, dragMoveEnabled, and dropEnabled all
> set to true.
> 2. Try dragging rows around and dropping them.
> Environment
> Windows 8, Apache Flex 4.14
> Expected Behavior
> Seeing the drop indicator.
> The expected behavior of dragging a row and dropping it in another location.
> Actual Behavior
> No drop indicator. Dropping a row does nothing.
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