adobe/brackets — pull request #5799 by redmunds (2013-10-31 23:37:31+00:00)
Title: [REVIEW ONLY] Implement steps() timing function editor

Marking [REVIEW ONLY] so XD can review.

Current Status:

**Support for:**
* steps(<integer>[,[start|end]]) function
* step-start
* step-end

**Keyboard Events**
* up/down arrows control steps
* left/right arrows control start/end
- discoverability?

**Issues:**
* Mouse support?
- doesn't seem like any natural gestures
* Edit controls?
- count spin control
- toggle switch for start/end
* More then ~25 steps is not usable
- dynamically make lines thinner as number of steps grows?
- increase size of editor?
- rescale grid?
* Editing doc while editor open is unforgiving
- e.g. While typing "start", editor closes due to intermedite updates

**Validation:**
- also applies to cubic-bezier()
- editor silently fails when invalid parameters
- need way to provide feedback
- also applies to ">25 steps" case

I developed this using TDD, so this includes Unit Tests.