text: /* AlloyFinger v0.1.10
   * By dntzhang
   * Github: https://github.com/AlloyTeam/AlloyFinger
   */
  ; (function () {
      function getLen(v) {
          return Math.sqrt(v.x * v.x + v.y * v.y);
      }
  
      function dot(v1, v2) {
          return v1.x * v2.x + v1.y * v2.y;
      }
  
      function getAngle(v1, v2) {
          var mr = getLen(v1) * getLen(v2);
          if (mr === 0) return 0;
          var r = dot(v1, v2) / mr;
          if (r > 1) r = 1;
          return Math.acos(r);
      }
  
      function cross(v1, v2) {
          return v1.x * v2.y - v2.x * v1.y;
      }
  
      function getRotateAngle(v1, v2) {
          var angle = getAngle(v1, v2);
          if (cross(v1, v2) > 0) {
              angle *= -1;
          }
  
          return angle * 180 / Math.PI;
      }
  
      var HandlerAdmin = function(el) {
          this.handlers = [];
          this.el = el;
      };
  
      HandlerAdmin.prototype.add = function(handler) {
          this.handlers.push(handler);
      }
  
      HandlerAdmin.prototype.del = function(handler) {
          if(!handler) this.handlers = [];
  
          for(var i=this.handlers.length; i>=0; i--) {
              if(this.handlers[i] === handler) {
                  this.handlers.splice(i, 1);
              }
          }
      }
  
      HandlerAdmin.prototype.dispatch = function() {
          for(var i=0,len=this.handlers.length; i<len; i++) {
              var handler = this.handlers[i];
              if(typeof handler === 'function') handler.apply(this.el, arguments);
          }
      }
  
      function wrapFunc(el, handler) {
          var handlerAdmin = new HandlerAdmin(el);
          handlerAdmin.add(handler);
  
          return handlerAdmin;
      }
  
      var AlloyFinger = function (el, option) {
  
          this.element = typeof el == 'string' ? document.querySelector(el) : el;
  
          this.start = this.start.bind(this);
          this.move = this.move.bind(this);
          this.end = this.end.bind(this);
          this.cancel = this.cancel.bind(this);
          this.element.addEventListener("touchstart", this.start, false);
          this.element.addEventListener("touchmove", this.move, false);
          this.element.addEventListener("touchend", this.end, false);
          this.element.addEventListener("touchcancel", this.cancel, false);
  
          this.preV = { x: null, y: null };
          this.pinchStartLen = null;
          this.zoom = 1;
          this.isDoubleTap = false;
  
          var noop = function () { };
  
          this.rotate = wrapFunc(this.element, option.rotate || noop);
          this.touchStart = wrapFunc(this.element, option.touchStart || noop);
          this.multipointStart = wrapFunc(this.element, option.multipointStart || noop);
          this.multipointEnd = wrapFunc(this.element, option.multipointEnd || noop);
          this.pinch = wrapFunc(this.element, option.pinch || noop);
          this.swipe = wrapFunc(this.element, option.swipe || noop);
          this.tap = wrapFunc(this.element, option.tap || noop);
          this.doubleTap = wrapFunc(this.element, option.doubleTap || noop);
          this.longTap = wrapFunc(this.element, option.longTap || noop);
          this.singleTap = wrapFunc(this.element, option.singleTap || noop);
          this.pressMove = wrapFunc(this.element, option.pressMove || noop);
          this.twoFingerPressMove = wrapFunc(this.element, option.twoFingerPressMove || noop);
          this.touchMove = wrapFunc(this.element, option.touchMove || noop);
          this.touchEnd = wrapFunc(this.element, option.touchEnd || noop);
          this.touchCancel = wrapFunc(this.element, option.touchCancel || noop);
  
          this._cancelAllHandler = this.cancelAll.bind(this);
  
          window.addEventListener('scroll', this._cancelAllHandler);
  
          this.delta = null;
          this.last = null;
          this.now = null;
          this.tapTimeout = null;
          this.singleTapTimeout = null;
          this.longTapTimeout = null;
          this.swipeTimeout = null;
          this.x1 = this.x2 = this.y1 = this.y2 = null;
          this.preTapPosition = { x: null, y: null };
      };
  
      AlloyFinger.prototype = {
          start: function (evt) {
              if (!evt.touches) return;
              this.now = Date.now();
              this.x1 = evt.touches[0].pageX;
              this.y1 = evt.touches[0].pageY;
              this.delta = this.now - (this.last || this.now);
              this.touchStart.dispatch(evt, this.element);
              if (this.preTapPosition.x !== null) {
                  this.isDoubleTap = (this.delta > 0 && this.delta <= 250 && Math.abs(this.preTapPosition.x - this.x1) < 30 && Math.abs(this.preTapPosition.y - this.y1) < 30);
                  if (this.isDoubleTap) clearTimeout(self.singleTapTimeout);
              }
              this.preTapPosition.x = this.x1;
              this.preTapPosition.y = this.y1;
              this.last = this.now;
              var preV = this.preV,
                  len = evt.touches.length;
              if (len > 1) {
                  this._cancelLongTap();
                  this._cancelSingleTap();
                  var v = { x: evt.touches[1].pageX - this.x1, y: evt.touches[1].pageY - this.y1 };
                  preV.x = v.x;
                  preV.y = v.y;
                  this.pinchStartLen = getLen(preV);
                  this.multipointStart.dispatch(evt, this.element);
              }
              this._preventTap = false;
              this.longTapTimeout = setTimeout(function () {
                  this.longTap.dispatch(evt, this.element);
                  this._preventTap = true;
              }.bind(this), 750);
          },
          move: function (evt) {
              if (!evt.touches) return;
              var preV = this.preV,
                  len = evt.touches.length,
                  currentX = evt.touches[0].pageX,
                  currentY = evt.touches[0].pageY;
              this.isDoubleTap = false;
              if (len > 1) {
                  var sCurrentX = evt.touches[1].pageX,
                      sCurrentY = evt.touches[1].pageY
                  var v = { x: evt.touches[1].pageX - currentX, y: evt.touches[1].pageY - currentY };
  
                  if (preV.x !== null) {
                      if (this.pinchStartLen > 0) {
                          evt.zoom = getLen(v) / this.pinchStartLen;
                          this.pinch.dispatch(evt, this.element);
                      }
  
                      evt.angle = getRotateAngle(v, preV);
                      this.rotate.dispatch(evt, this.element);
                  }
                  preV.x = v.x;
                  preV.y = v.y;
  
                  if (this.x2 !== null && this.sx2 !== null) {
                      evt.deltaX = (currentX - this.x2 + sCurrentX - this.sx2) / 2;
                      evt.deltaY = (currentY - this.y2 + sCurrentY - this.sy2) / 2;
                  } else {
                      evt.deltaX = 0;
                      evt.deltaY = 0;
                  }
                  this.twoFingerPressMove.dispatch(evt, this.element);
  
                  this.sx2 = sCurrentX;
                  this.sy2 = sCurrentY;
              } else {
                  if (this.x2 !== null) {
                      evt.deltaX = currentX - this.x2;
                      evt.deltaY = currentY - this.y2;
  
                      //move事件中添加对当前触摸点到初始触摸点的判断，
                      //如果曾经大于过某个距离(比如10),就认为是移动到某个地方又移回来，应该不再触发tap事件才对。
                      var movedX = Math.abs(this.x1 - this.x2),
                          movedY = Math.abs(this.y1 - this.y2);
  
                      if(movedX > 10 || movedY > 10){
                          this._preventTap = true;
                      }
  
                  } else {
                      evt.deltaX = 0;
                      evt.deltaY = 0;
                  }
                  
                  
                  this.pressMove.dispatch(evt, this.element);
              }
  
              this.touchMove.dispatch(evt, this.element);
  
              this._cancelLongTap();
              this.x2 = currentX;
              this.y2 = currentY;
              
              if (len > 1) {
                  evt.preventDefault();
              }
          },
          end: function (evt) {
              if (!evt.changedTouches) return;
              this._cancelLongTap();
              var self = this;
              if (evt.touches.length < 2) {
                  this.multipointEnd.dispatch(evt, this.element);
                  this.sx2 = this.sy2 = null;
              }
  
              //swipe
              if ((this.x2 && Math.abs(this.x1 - this.x2) > 30) ||
                  (this.y2 && Math.abs(this.y1 - this.y2) > 30)) {
                  evt.direction = this._swipeDirection(this.x1, this.x2, this.y1, this.y2);
                  this.swipeTimeout = setTimeout(function () {
                      self.swipe.dispatch(evt, self.element);
  
                  }, 0)
              } else {
                  this.tapTimeout = setTimeout(function () {
                      if(!self._preventTap){
                          self.tap.dispatch(evt, self.element);
                      }
                      // trigger double tap immediately
                      if (self.isDoubleTap) {
                          self.doubleTap.dispatch(evt, self.element);
                          self.isDoubleTap = false;
                      }
                  }, 0)
  
                  if (!self.isDoubleTap) {
                      self.singleTapTimeout = setTimeout(function () {
                          self.singleTap.dispatch(evt, self.element);
                      }, 250);
                  }
              }
  
              this.touchEnd.dispatch(evt, this.element);
  
              this.preV.x = 0;
              this.preV.y = 0;
              this.zoom = 1;
              this.pinchStartLen = null;
              this.x1 = this.x2 = this.y1 = this.y2 = null;
          },
          cancelAll: function () {
              this._preventTap = true
              clearTimeout(this.singleTapTimeout);
              clearTimeout(this.tapTimeout);
              clearTimeout(this.longTapTimeout);
              clearTimeout(this.swipeTimeout);
          },
          cancel: function (evt) {
              this.cancelAll()
              this.touchCancel.dispatch(evt, this.element);
          },
          _cancelLongTap: function () {
              clearTimeout(this.longTapTimeout);
          },
          _cancelSingleTap: function () {
              clearTimeout(this.singleTapTimeout);
          },
          _swipeDirection: function (x1, x2, y1, y2) {
              return Math.abs(x1 - x2) >= Math.abs(y1 - y2) ? (x1 - x2 > 0 ? 'Left' : 'Right') : (y1 - y2 > 0 ? 'Up' : 'Down')
          },
  
          on: function(evt, handler) {
              if(this[evt]) {
                  this[evt].add(handler);
              }
          },
  
          off: function(evt, handler) {
              if(this[evt]) {
                  this[evt].del(handler);
              }
          },
  
          destroy: function() {
              if(this.singleTapTimeout) clearTimeout(this.singleTapTimeout);
              if(this.tapTimeout) clearTimeout(this.tapTimeout);
              if(this.longTapTimeout) clearTimeout(this.longTapTimeout);
              if(this.swipeTimeout) clearTimeout(this.swipeTimeout);
  
              this.element.removeEventListener("touchstart", this.start);
              this.element.removeEventListener("touchmove", this.move);
              this.element.removeEventListener("touchend", this.end);
              this.element.removeEventListener("touchcancel", this.cancel);
  
              this.rotate.del();
              this.touchStart.del();
              this.multipointStart.del();
              this.multipointEnd.del();
              this.pinch.del();
              this.swipe.del();
              this.tap.del();
              this.doubleTap.del();
              this.longTap.del();
              this.singleTap.del();
              this.pressMove.del();
              this.twoFingerPressMove.del()
              this.touchMove.del();
              this.touchEnd.del();
              this.touchCancel.del();
  
              this.preV = this.pinchStartLen = this.zoom = this.isDoubleTap = this.delta = this.last = this.now = this.tapTimeout = this.singleTapTimeout = this.longTapTimeout = this.swipeTimeout = this.x1 = this.x2 = this.y1 = this.y2 = this.preTapPosition = this.rotate = this.touchStart = this.multipointStart = this.multipointEnd = this.pinch = this.swipe = this.tap = this.doubleTap = this.longTap = this.singleTap = this.pressMove = this.touchMove = this.touchEnd = this.touchCancel = this.twoFingerPressMove = null;
  
              window.removeEventListener('scroll', this._cancelAllHandler);
              return null;
          }
      };
  
      if (typeof module !== 'undefined' && typeof exports === 'object') {
          module.exports = AlloyFinger;
      } else {
          window.AlloyFinger = AlloyFinger;
      }
  })();
  