Graph Editor: Add UI support for enumerated values

[kwokcb]

Issue

Enumerations are string entry fields instead of as a set of enumerations which can be selected. This makes it so users have to guess or lookup the string in spec / definitions.

Note: Every change causes a shader rebuild as well.

Proposal

Add in some basic UI such as a drop-down menu with the options pre-populated. Then the user cannot enter an invalid value and shader rebuild overhead is removed.

[kwokcb]

Sug as possible first issue ?

[inter-sakot4]

Hi , Can I pick this as first issue for upcoming Dev Days? I am a first time contributor, I have draft version of solution, will be able to refine the solution further on Dev Days.

[jstone-lucasfilm]

Excellent, welcome @inter-sakot4!

[inter-sakot4]

I am close to concluding this issue GraphEditor - Enum task , but I made few assumptions:

• Fix the issue for only GraphEditor , though similar issue exist also in MaterialXView
• Generalize the solution to int, boolean, string, float, double, Vector2, Vector3, Vector4, Color3, Color4, Matrix types

[ld-kerley]

I think its fine to scope the work just to the GraphEditor if that makes sense for now - if thats the route you go - we may make sub-tasks for the GraphEditor and the Viewer - to keep the main task open.