Awesome

Keyboard Input for Framer

If you have any feedback, give me a shout on twitter – @struanfraser.

This small module makes it a little nicer to use keyboard functionality in Framer. I created this as I prototype for YouView TV using a FLIRC for infrared input, which translates directly to keyboard input.

Getting Started

First of all, you have to make sure Keyboard.coffee is in your modules folder, then you have to type –

keyboard = require "Keyboard"

– at the top of your project.

Triggering a function with a key

I often use this to prototype recordings on our set top box. Say you want to trigger a recording with the R key.

Create a function like follows –

record = () ->
    print "it's recorded!"

Then to use the R key to activate the function, we need only write –

keyboard.onKey( keyboard.r, record )

Stopping a key from calling a function

Perhaps you no longer want the key you've previously mapped to call the same function. You can remove the key listener with the following function –

keyboard.offKey( keyboard.r )

Throttling

As key input is constant, it will often call functions far too quickly. One solution to this is using throttling. Throttling ensures that a function is only called once every x seconds.

If we want to throttle our key input, we just add it as another paramater in the function in seconds. As follows –

keyboard.onKey( keyboard.r, record, 0.3 )

Now if we hold the R button, it will only call the record() function every 0.3 seconds. If you're struggling with animations, it will often help to set your throttle to the length of your longest animation.

Passing a parameter to a function

Because using brackets (i.e. record()) will cause a function to immediately execute we cannot pass parameters without employing a small trick. To pass a function with parameters in coffescript we need only do the following –

keyboard.onKey( keyboard.r, (-> record( parameterOne, parameterTwo )), 0.3 )

As the arrow is declaring a new function, it is returning the entire function rather than executing it. We could also write this as (-> return record( parameterOne, parameterTwo )) but, as CoffeeScript returns the last declared object by default, we can omit the return.

Available Keys

You can use any of the following keys after you've assigned a prefix. In our example, we used keyboard. as a prefix. If you want to use backspace it would be keyboard.backspace.

backspace
tab
enter
shift
ctrl
alt

caps
escape
pageUp
pageDown

left
up
right
down
delete

zero
one
two
three
four
five
six
seven
eight
nine

a
b
c
d
e
f
g
h
i
j
k
l
m
n
o
p
q
r
s
t
u
v
w
x
y
z

numZero
numOne
numTwo
numThree
numFour
numFive
numSix
numSeven
numEight
numNine

fOne
fTwo
fThree
fFour
fFive
fSix
fSeven
fEight
fNine
fTen

semiColon
equalSign
comma
dash
period
forwardSlash
openBracket
backSlash
closeBracket
singleQuote

If you'd like to know more or you have any particular feature requests, get in touch – @struanfraser.

Other useful projects for TV

• FocusEngine
• RemoteLayer