[FLEX-25185] mx.skins.halo.ScrollArrowSkin highlight is draw incorrectly

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: Adobe Flex SDK 3.0 (Release)
• Component/s: Themes
• Environment: Affected OS(s): All OS Platforms; Affected OS(s): All OS Platforms; Browser: Internet Explorer 8.x; Language Found: English
• Assignee: Unassigned
• Reporter: Adobe JIRA
• Created: 03/Sep/10 01:59
• Updated: 03/Sep/10 01:59

Description

Steps to reproduce:
1. Create a Scrollbar (any kind)
2. set "highlight-alphas" to an easily predictable value (eg: [1, 0])
3. use the same setting on a regular Button
4. run the application and observe the difference

Actual Results:
The button highlight will fade to 50% of the Button's height.
The scroll button highlight will be applied over the entire ipArrow and downArrow instance height.

Expected Results:
The button highlight should appear identical for both types of buttons.

Workaround (if any):

The problem lies in ScrollArrowSkin. Everywhere in the highlight code it is written as: " h - 2 / 2" which evaluates to h - 1. This is nearly 100% of the instance's height value. Contrast this with mx.skins.halo.ButtonSkin where the code is written "(h - 2) / 2" which is approximately half of the button's height (the upper half). I think it is obvious that ButtonSkin is working correctly, while ScrollArrowSkin is not.

The workaround is to copy the ScrollArrowSkin and fix the problem yourself by inserting the required parentheses.