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Posted to dev@flex.apache.org by "Justin Mclean (JIRA)" <ji...@apache.org> on 2013/04/24 00:55:15 UTC
[jira] [Updated] (FLEX-26948) Null reference in Slider class:
updateDisplayList
[ https://issues.apache.org/jira/browse/FLEX-26948?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Justin Mclean updated FLEX-26948:
---------------------------------
Labels: easyfix (was: )
> Null reference in Slider class: updateDisplayList
> -------------------------------------------------
>
> Key: FLEX-26948
> URL: https://issues.apache.org/jira/browse/FLEX-26948
> Project: Apache Flex
> Issue Type: Bug
> Components: mx: Slider
> Affects Versions: Adobe Flex SDK 4.1 (Release)
> Environment: Affected OS(s): All OS Platforms
> Browser: Internet Explorer 7.x
> Language Found: English
> Reporter: Adobe JIRA
> Labels: easyfix
>
> We ran into a null reference in the mx Slider class, though the steps to reproduce are unknown. It happened in the updateDisplayList function, in the following code snippet:
> var isHorizontal:Boolean = (_direction == SliderDirection.HORIZONTAL);
> var numLabels:int = labelObjects ? labelObjects.numChildren : 0;
> var numThumbs:int = thumbs ? thumbs.numChildren : 0;
> var trackMargin:Number = getStyle("trackMargin");
> var widestThumb:Number = 6;
> var firstThumb:SliderThumb = SliderThumb(thumbs.getChildAt(0));
> if (thumbs && firstThumb)
> widestThumb = firstThumb.getExplicitOrMeasuredWidth();
> Note that the statement assigning numThumbs checks for null, but the statement assigning firstThumb does not. We had a null thumbs, which caused the firstThumb assignment to fail.
> The fix should be a simple matter of checking for null thumbs when assigning firstThumb.
>
> Actual Results:
> An ActionScript error has occurred:
> TypeError: Error #1009: Cannot access a property or method of a null object reference.
>
> Expected Results:
> No runtime error
>
> Workaround (if any):
> unknown
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