Define color
Use color
Is this reasonable, or is there a better way?
Thank you
No, because you're not returning a Color you're returning a String. I would be surprised if that works at all.
Vision has access to the java.awt.Color class, you should use that if you're setting the color by script.
In the expression language the Color() expression will return a java.awt.Color object, so for red you would use Color(255,0,0) the expression also accepts an optional alpha value.
In vision, the common practice is to use Client tags to hold theme values, for instance you might have a Client Expression Tag [client]Themes/Light/Colors/Faulted which has the expression above in it.
Generally, I would create a Theme UDT, and then have an instance of that UDT for each theme. Then indirectly bind the component properties to correct color based on the users theme selection and the desired function.
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I expect it to work, but it's way less efficient than alternatives.
You're using runScript (moving from relatively fast expressions to relatively slow Jython interpreter overhead) purely to return a literal string, which then has to get regex parsed implicitly by the type coercion on whatever property you've got to turn the literal string value into a color, best effort.
If you're going to create colors in scripting, use system.gui.color at least. Better still is client tags, as @lrose mentioned; you can directly read them from expression as Color objects, so you're going to skip a ton of overhead.
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