[jira] [Created] (FLEX-33944) Cannot scroll to the bottom when using variable row height and calculateRowHeight() with some rows are very large

["Frédéric Leroy (JIRA)" <ji...@apache.org>]

Frédéric Leroy created FLEX-33944:
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             Summary: Cannot scroll to the bottom when using variable row height and calculateRowHeight() with some rows are very large
                 Key: FLEX-33944
                 URL: https://issues.apache.org/jira/browse/FLEX-33944
             Project: Apache Flex
          Issue Type: Bug
          Components: Advanced Data Grid
    Affects Versions: Apache Flex 4.9.0, Adobe Flex SDK 4.6 (Release), Apache Flex 4.11.0
            Reporter: Frédéric Leroy


How to reproduce:
1. Run the attached Main.mxml application
2. Scroll down

Observed:
Cannot scroll past the large row.

Expected:
It should be possible to scroll past the large row.


The calculateRowHeight() method of the ADG can be overridden to allow to customize the height of rows in variable row height mode. In our application we override it to synchronize the layout of rows with an external component.

The problem here is that calculateRowHeight() this method is not used by the ADG in all places where the height of rows is measured. In particular it is not used in AdvancedDataGridBaseEx.adjustVerticalScrollPositionDownward(). As a result when some row get a large height it becomes impossible to scroll past such a large row.

See the attached AdvancedDataGridFixed extends AdvancedDataGrid and implements a workaround for this issue, lines 194-213.



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