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https://issues.apache.org/jira/browse/FLEX-33559?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13658571#comment-13658571
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Koen Weyn commented on FLEX-33559:
----------------------------------
When researching this issue, I found the below snippet in the code of
spark.components.gridClasses
The getColumnBounds method is used to determine how much of a horizontal scroll
has to happen,
but when the rowCount is 0, the method returns 0 for width.
/**
* Returns the layout bounds of the specified column.
*
* @langversion 3.0
* @playerversion Flash 10
* @playerversion AIR 2.0
* @productversion Flex 4.5
*/
public function getColumnBounds(col:int):Rectangle
{
// TODO (klin): provide optional return value (Rectangle) parameter
if ((col < 0) || (col >= _columnCount))
return null;
if (_columnCount == 0 || _rowCount == 0)
return new Rectangle(0, 0, 0, 0);
const x:Number = getCellX(0, col);
const y:Number = getCellY(0, col);
const colWidth:Number = getColumnWidth(col);
const colHeight:Number = getCellY(_rowCount - 1, col) +
getRowHeight(_rowCount - 1) - y;
return new Rectangle(x, y, colWidth, colHeight);
}
> Horizontal scrolling of an empty spark DataGrid does not work
> -------------------------------------------------------------
>
> Key: FLEX-33559
> URL: https://issues.apache.org/jira/browse/FLEX-33559
> Project: Apache Flex
> Issue Type: Bug
> Components: Spark: DataGrid
> Affects Versions: Adobe Flex SDK 4.5 (Release)
> Environment: Windows
> OSX
> Reporter: Koen Weyn
>
> When a DataGrid contains more columns than can fit on the screen, but
> contains no rows, horizontal scrolling is only possible when dragging the
> thumb.
> Clicking the arrows or the track does not work.
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