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https://issues.apache.org/jira/browse/FLEX-33867?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13812211#comment-13812211
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Maurice Amsellem commented on FLEX-33867:
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Hi, I have tested your project and debugged through the DataGrid classes.
As far as I understand the code, DataGrid was not designed to allow dynamic
change of row height, especially during temporary states just as hovering on an
item.
The only situation that seem to trigger a full re-layout of item renderers is
horizontal or vertical scroll position change, and of course when the
dataProvider content is changed.
( see : GridViewLayout.updateDisplayList() line 941 and following).
I tried various hacks to force the grid to relayout the item renderers, but
none did work.
My conclusion is that this is not a bug, but a design limitation of spark
DataGrid.
I suggest to turn it to a feature request, but you are not guaranteed it will
ever be implemented.
Moreover, and that's a personal opinion, I don't find that increasing the
height of a datagrid cell when hovered is user-friendly, as it causes some
abrupt change in the datagrid display.
I suggest you stick to usual way of managing this ( datatip, overlay, etc...)
> DataGrid row doesnt resized on hovered - with custom itemRenderer and
> dg.variableRowHeight=true
> -----------------------------------------------------------------------------------------------
>
> Key: FLEX-33867
> URL: https://issues.apache.org/jira/browse/FLEX-33867
> Project: Apache Flex
> Issue Type: Bug
> Components: Spark: DataGrid
> Affects Versions: Apache Flex 4.11.0
> Reporter: Sebastian Wichmann
> Priority: Minor
> Labels: Datagrid, gridrowheight
> Fix For: Apache Flex 4.9.0
>
> Attachments: TestItemRenderer.mxml, TestProject.mxml
>
>
> I create a itemRenderer with a hovered state. On hovered I wanna change the
> size of this itemRenderer but the row doesnt resized.
> For example, see attached files.
> Workaround:
> Call on resize:
> grid.invalidateDisplayList();
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