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Simple class to handle touch events and emit them to your application. Utilizes EventEmitter.
@Touch=
horizontal_sensitivity: 22
vertical_sensitivity: 6
touchDX: 0
touchDY: 0
touchStartX: 0
touchStartY: 0
bind: (elements...) ->
for elem in elements
elem.addEventListener "touchstart", (event) =>
@handleStart(event, elem)
elem.addEventListener "touchmove", (event) =>
@handleMove(event, elem)
elem.addEventListener "touchend", (event) =>
@handleEnd(event, elem)
emitSlideLeft: -> @emit 'swipe:left'
emitSlideRight: -> @emit 'swipe:right'
emitSlideUp: -> @emit 'swipe:up'
emitSlideDown: -> @emit 'swipe:down'
handleStart: (event, elem) ->
if event.touches.length is 1
@touchDX = 0
@touchDY = 0
@touchStartX = event.touches[0].pageX
@touchStartY = event.touches[0].pageY
handleMove: (event, elem) ->
if event.touches.length > 1
@cancelTouch(elem)
return false
@touchDX = event.touches[0].pageX - @touchStartX
@touchDY = event.touches[0].pageY - @touchStartY
handleEnd: (event,elem) ->
dx = Math.abs(@touchDX)
dy = Math.abs(@touchDY)
if (dx > @horizontal_sensitivity) and (dy < (dx * 2 / 3))
if @touchDX > 0 then @emitSlideRight() else @emitSlideLeft()
if (dy > @vertical_sensitivity) and (dx < (dy * 2 / 3))
if @touchDY > 0 then @emitSlideDown() else @emitSlideUp()
@cancelTouch(event, elem)
false
cancelTouch: (event, elem) ->
elem.removeEventListener('touchmove', @handleTouchMove, false)
elem.removeEventListener('touchend', @handleTouchEnd, false)
true
for key, value of new EventEmitter()
Touch[key] = value
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