tullaRange is an addon that allows the user to make action buttons change color completely under the following conditions:

• When an action is out of range
• When the user is out of energy/mana/focus/etc

Colors for each setting are configurable by a GUI in the addons options menu.

Why use tullaRange over something like RedRange?

tullaRange is derived from RedRange. The main thing I do differently is that I replace each individual action button's OnUpdate handler with a single global one. The end result is that tullaRange uses less CPU than other implementations.

Where can I find the source?

GitHub