1 files changed, 113 insertions, 0 deletions
diff --git a/frontend/gamma/js/Zepto/touch.js b/frontend/gamma/js/Zepto/touch.js
new file mode 100644
index 0000000..af109b9
--- a/dev/null
+++ b/frontend/gamma/js/Zepto/touch.js
@@ -0,0 +1,113 @@
+//     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)