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// Zepto.js
// (c) 2010-2012 Thomas Fuchs
// Zepto.js may be freely distributed under the MIT license.
;(function($){
var touch = {},
touchTimeout, tapTimeout, swipeTimeout,
longTapDelay = 750, longTapTimeout
function parentIfText(node) {
return 'tagName' in node ? node : node.parentNode
}
function swipeDirection(x1, x2, y1, y2) {
var xDelta = Math.abs(x1 - x2), yDelta = Math.abs(y1 - y2)
return xDelta >= yDelta ? (x1 - x2 > 0 ? 'Left' : 'Right') : (y1 - y2 > 0 ? 'Up' : 'Down')
}
function longTap() {
longTapTimeout = null
if (touch.last) {
touch.el.trigger('longTap')
touch = {}
}
}
function cancelLongTap() {
if (longTapTimeout) clearTimeout(longTapTimeout)
longTapTimeout = null
}
function cancelAll() {
if (touchTimeout) clearTimeout(touchTimeout)
if (tapTimeout) clearTimeout(tapTimeout)
if (swipeTimeout) clearTimeout(swipeTimeout)
if (longTapTimeout) clearTimeout(longTapTimeout)
touchTimeout = tapTimeout = swipeTimeout = longTapTimeout = null
touch = {}
}
$(document).ready(function(){
var now, delta
$(document.body)
.bind('touchstart', function(e){
now = Date.now()
delta = now - (touch.last || now)
touch.el = $(parentIfText(e.touches[0].target))
touchTimeout && clearTimeout(touchTimeout)
touch.x1 = e.touches[0].pageX
touch.y1 = e.touches[0].pageY
if (delta > 0 && delta <= 250) touch.isDoubleTap = true
touch.last = now
longTapTimeout = setTimeout(longTap, longTapDelay)
})
.bind('touchmove', function(e){
cancelLongTap()
touch.x2 = e.touches[0].pageX
touch.y2 = e.touches[0].pageY
})
.bind('touchend', function(e){
cancelLongTap()
// swipe
if ((touch.x2 && Math.abs(touch.x1 - touch.x2) > 30) ||
(touch.y2 && Math.abs(touch.y1 - touch.y2) > 30))
swipeTimeout = setTimeout(function() {
touch.el.trigger('swipe')
touch.el.trigger('swipe' + (swipeDirection(touch.x1, touch.x2, touch.y1, touch.y2)))
touch = {}
}, 0)
// normal tap
else if ('last' in touch)
// delay by one tick so we can cancel the 'tap' event if 'scroll' fires
// ('tap' fires before 'scroll')
tapTimeout = setTimeout(function() {
// trigger universal 'tap' with the option to cancelTouch()
// (cancelTouch cancels processing of single vs double taps for faster 'tap' response)
var event = $.Event('tap')
event.cancelTouch = cancelAll
touch.el.trigger(event)
// trigger double tap immediately
if (touch.isDoubleTap) {
touch.el.trigger('doubleTap')
touch = {}
}
// trigger single tap after 250ms of inactivity
else {
touchTimeout = setTimeout(function(){
touchTimeout = null
touch.el.trigger('singleTap')
touch = {}
}, 250)
}
}, 0)
})
.bind('touchcancel', cancelAll)
$(window).bind('scroll', cancelAll)
})
;['swipe', 'swipeLeft', 'swipeRight', 'swipeUp', 'swipeDown', 'doubleTap', 'tap', 'singleTap', 'longTap'].forEach(function(m){
$.fn[m] = function(callback){ return this.bind(m, callback) }
})
})(Zepto)
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