http://www.bandaidsclub.com/wp-content/themes/hiliter/js/jquery.doubletap.js?ver=4.3.31

1(function($) {
2  var touchStatus = function(target, touch) {
3    this.target    = $(target);
4    this.touch     = touch;
5    this.startX    = this.currentX = touch.screenX;
6    this.startY    = this.currentY = touch.screenY;
7    this.eventType = null;
8  }
9  touchStatus.latestTap = null;
10
11  touchStatus.prototype.move = function(touch) {
12    this.currentX = touch.screenX;
13    this.currentY = touch.screenY;
14  }
15
16  touchStatus.prototype.process = function() {
17    var offsetX = this.currentX - this.startX;
18    var offsetY = this.currentY - this.startY;
19    if(offsetX == 0 && offsetY == 0) {
20      this.checkForDoubleTap()
21    } else if(Math.abs(offsetY) > Math.abs(offsetX)) {
22      this.eventType = offsetY > 0 ? 'swipedown' : 'swipeup';
23      this.target.trigger('swipe', [this])
24    } else {
25      this.eventType = offsetX > 0 ? 'swiperight' : 'swipeleft';
26      this.target.trigger('swipe', [this])
27    }
28    this.target.trigger(this.eventType, [this])
29    this.target.trigger('touch',        [this])
30  }
31
32  touchStatus.prototype.checkForDoubleTap = function() {
33    if(touchStatus.latestTap) {
34      if((new Date() - touchStatus.latestTap) < 400) 
35        this.eventType = 'doubletap'
36    }
37    if(!this.eventType) this.eventType = 'tap'
38    touchStatus.latestTap = new Date()
39  }
40
41  var swipeEvents = function(elements) {
42    elements.bind('touchstart',  this.touchStart);
43    elements.bind('touchmove',   this.touchMove);
44    elements.bind('touchcancel', this.touchCancel);
45    elements.bind('touchend',    this.touchEnd);
46  }
47
48  swipeEvents.prototype.touchStart = function(evt) {
49    var target = this;
50    swipeEvents.eachTouch(evt, function(touch) {
51      swipeEvents.touches[touch.identifier] = new touchStatus(target, touch);
52    })
53  }
54
55  swipeEvents.prototype.touchMove = function(evt) {
56    swipeEvents.eachTouch(evt, function(touch) {
57      var loc = swipeEvents.touches[touch.identifier]
58      if(loc) loc.move(touch)
59    })
60  }
61
62  swipeEvents.prototype.touchCancel = function(evt) {
63    swipeEvents.eachTouch(evt, function(touch) {
64      swipeEvents.purge(touch, true)
65    })
66  }
67
68  swipeEvents.prototype.touchEnd = function(evt) {
69    swipeEvents.eachTouch(evt, function(touch) {
70      swipeEvents.purge(touch)
71    })
72  }
73
74  swipeEvents.touches = {}
75  swipeEvents.purge = function(touch, cancelled) {
76    if(!cancelled) {
77      var loc = swipeEvents.touches[touch.identifier]
78      if(loc) loc.process()
79    }
80    delete swipeEvents.touches[touch.identifier]
81  }
82
83  swipeEvents.eachTouch = function(evt, callback) {
84    var evt = evt.originalEvent;
85    var num = evt.changedTouches.length;
86    for(var i = 0; i < num; i++) {
87      callback(evt.changedTouches[i])
88    }
89  }
90
91  // adds custom events:
92  //   touch      // all events
93  //   swipe      // only swipe* events
94  //   swipeleft
95  //   swiperight
96  //   swipeup
97  //   swipedown
98  //   tap
99  //   doubletap
100  $.fn.addSwipeEvents = function(callback) {
101    new swipeEvents(this);
102    if(callback) this.bind('touch', callback)
103    return this;
104  }
105})(jQuery);