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https://issues.apache.org/jira/browse/FLEX-34907?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14626465#comment-14626465
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Joshua Vanderberg commented on FLEX-34907:
------------------------------------------
Here is sample code. Run it in a browser and then resize the window width,
back and forth repeatedly. Each time you increase and decrease the width, the
first 5 columns will become a little bit narrower. Keep doing it and
eventually they get down to 20 px.
I have patched this issue several times in successive SDK with the original
calculation from the Flex 3.1 SDK, the issue seems to be related to the use of
Math.floor in width calculations, for example Line 3053.
newSize = Math.floor(lastColumn.width - (totalWidth - displayWidth) * ratio);
Replacing this (and the other similar occurrences of Math.floor) with:
newSize = lastColumn.width - (totalWidth - displayWidth) * ratio;
Corrects the issue.
Workaround:
Adding horizontalScrollPolicy="on" to the data grid.
Example code to reproduce:
=======================================
<?xml version="1.0" encoding="utf-8"?>
<mx:Application width="100%" height="100%"
xmlns:mx="http://www.adobe.com/2006/mxml";
resize="application1_resizeHandler(event)" >
<mx:Script>
<![CDATA[
import mx.events.ResizeEvent;
protected function
application1_resizeHandler(event:ResizeEvent):void
{
if (grid) {
trace("Width: "+grid.columns[0].width);
}
}
]]>
</mx:Script>
<mx:DataGrid id="grid" width="100%" height="100%" >
<mx:columns>
<mx:DataGridColumn width="300" headerText="This is
column 1" />
<mx:DataGridColumn width="300" headerText="This is
column 2" />
<mx:DataGridColumn width="300" headerText="This is
column 3" />
<mx:DataGridColumn width="300" headerText="This is
column 4" />
<mx:DataGridColumn width="300" headerText="This is
column 5" />
</mx:columns>
</mx:DataGrid>
</mx:Application>
> Data grid column widths become progressively narrower as window resized
> -----------------------------------------------------------------------
>
> Key: FLEX-34907
> URL: https://issues.apache.org/jira/browse/FLEX-34907
> Project: Apache Flex
> Issue Type: Bug
> Components: mx: DataGrid
> Affects Versions: Apache Flex 4.13.0
> Environment: All
> Reporter: Joshua Vanderberg
> Priority: Minor
>
> As a DataGrid's width is resized, a loss of precision in
> DataGrid.calculateColumnSizes() causes columns to become progressively
> narrower, losing their original width.
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