Keyboard gestures
Factor handbook > UI framework > Implementing new gadgets > UI gestures

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There are two types of keyboard gestures:
key-down

key-up


Each keyboard gesture has a set of modifiers and a key symbol. The set modifiers is denoted by an array which must either be f, or an order-preserving subsequence of the following:
{ S+ C+ A+ M+ }

S+

C+

A+

M+


A key symbol is either a single-character string denoting literal input, or one of the following strings:
CLEAR
RET
ENTER
ESC
TAB
BACKSPACE
HOME
DELETE
END
F1
F2
F3
F4
F5
F6
F7
F8
F9
F10
F11
F12
LEFT
RIGHT
DOWN
UP
PAGE_UP
PAGE_DOWN

The S+ modifier is only ever used with the above action keys; alphanumeric input input with the shift key is delivered without the S+ modifier set, instead the input itself is upper case. For example, the gesture corresponding to s with the Control and Shift keys pressed is presented as
T{ key-down f { C+ } "S" }

The RET and TAB keys are never delivered in their literal form ("\n" and "\t").