Returns a static field from Input.Keys.

(key-code :a)
(key-code :page-down)
Options
:a
:alt-left
:alt-right
:any-key
:apostrophe
:at
:b
:back
:backslash
:backspace
:button-a
:button-b
:button-c
:button-circle
:button-l1
:button-l2
:button-mode
:button-r1
:button-r2
:button-select
:button-start
:button-thumbl
:button-thumbr
:button-x
:button-y
:button-z
:c
:call
:camera
:center
:clear
:colon
:comma
:control-left
:control-right
:d
:del
:down
:dpad-center
:dpad-down
:dpad-left
:dpad-right
:dpad-up
:e
:end
:endcall
:enter
:envelope
:equals
:escape
:explorer
:f
:f1
:f10
:f11
:f12
:f2
:f3
:f4
:f5
:f6
:f7
:f8
:f9
:focus
:forward-del
:g
:grave
:h
:headsethook
:home
:i
:insert
:j
:k
:l
:left
:left-bracket
:m
:media-fast-forward
:media-next
:media-play-pause
:media-previous
:media-rewind
:media-stop
:menu
:meta-alt-left-on
:meta-alt-on
:meta-alt-right-on
:meta-shift-left-on
:meta-shift-on
:meta-shift-right-on
:meta-sym-on
:minus
:mute
:n
:notification
:num
:num-0
:num-1
:num-2
:num-3
:num-4
:num-5
:num-6
:num-7
:num-8
:num-9
:numpad-0
:numpad-1
:numpad-2
:numpad-3
:numpad-4
:numpad-5
:numpad-6
:numpad-7
:numpad-8
:numpad-9
:o
:p
:page-down
:page-up
:period
:pictsymbols
:plus
:pound
:power
:q
:r
:right
:right-bracket
:s
:search
:semicolon
:shift-left
:shift-right
:slash
:soft-left
:soft-right
:space
:star
:switch-charset
:sym
:t
:tab
:u
:unknown
:up
:v
:volume-down
:volume-up
:w
:x
:y
:z
Source
(defmacro key-code
  [k]
  (u/gdx-field "Input$Keys" (u/key->upper k)))