text: ﻿/*!
   * iScroll v4.2.5 ~ Copyright (c) 2012 Matteo Spinelli, http://cubiq.org
   * Released under MIT license, http://cubiq.org/license
   */
  (function (window, doc) {
      var m = Math,
          dummyStyle = doc.createElement('div').style,
          vendor = (function () {
              var vendors = 't,webkitT,MozT,msT,OT'.split(','),
                  t,
                  i = 0,
                  l = vendors.length;
  
              for (; i < l; i++) {
                  t = vendors[i] + 'ransform';
                  if (t in dummyStyle) {
                      return vendors[i].substr(0, vendors[i].length - 1);
                  }
              }
  
              return false;
          })(),
          cssVendor = vendor ? '-' + vendor.toLowerCase() + '-' : '',
  
          // Style properties
          transform = prefixStyle('transform'),
          transitionProperty = prefixStyle('transitionProperty'),
          transitionDuration = prefixStyle('transitionDuration'),
          transformOrigin = prefixStyle('transformOrigin'),
          transitionTimingFunction = prefixStyle('transitionTimingFunction'),
          transitionDelay = prefixStyle('transitionDelay'),
  
          // Browser capabilities
          isAndroid = (/android/gi).test(navigator.appVersion),
          isIDevice = (/iphone|ipad/gi).test(navigator.appVersion),
          isTouchPad = (/hp-tablet/gi).test(navigator.appVersion),
  
          has3d = prefixStyle('perspective') in dummyStyle,
          hasTouch = 'ontouchstart' in window && !isTouchPad,
          hasTransform = vendor !== false,
          hasTransitionEnd = prefixStyle('transition') in dummyStyle,
  
          RESIZE_EV = 'onorientationchange' in window ? 'orientationchange' : 'resize',
          START_EV = hasTouch ? 'touchstart' : 'mousedown',
          MOVE_EV = hasTouch ? 'touchmove' : 'mousemove',
          END_EV = hasTouch ? 'touchend' : 'mouseup',
          CANCEL_EV = hasTouch ? 'touchcancel' : 'mouseup',
          TRNEND_EV = (function () {
              if (vendor === false) return false;
  
              var transitionEnd = {
                  '': 'transitionend',
                  'webkit': 'webkitTransitionEnd',
                  'Moz': 'transitionend',
                  'O': 'otransitionend',
                  'ms': 'MSTransitionEnd'
              };
  
              return transitionEnd[vendor];
          })(),
  
          nextFrame = (function () {
              return window.requestAnimationFrame ||
                  window.webkitRequestAnimationFrame ||
                  window.mozRequestAnimationFrame ||
                  window.oRequestAnimationFrame ||
                  window.msRequestAnimationFrame ||
                  function (callback) { return setTimeout(callback, 1); };
          })(),
          cancelFrame = (function () {
              return window.cancelRequestAnimationFrame ||
                  window.webkitCancelAnimationFrame ||
                  window.webkitCancelRequestAnimationFrame ||
                  window.mozCancelRequestAnimationFrame ||
                  window.oCancelRequestAnimationFrame ||
                  window.msCancelRequestAnimationFrame ||
                  clearTimeout;
          })(),
  
          // Helpers
          translateZ = has3d ? ' translateZ(0)' : '',
  
          // Constructor
          iScroll = function (el, options) {
              var that = this,
                  i;
  
              that.wrapper = typeof el == 'object' ? el : doc.getElementById(el);
              that.wrapper.style.overflow = 'hidden';
              that.scroller = that.wrapper.children[0];
  
              // Default options
              that.options = {
                  hScroll: true,
                  vScroll: true,
                  x: 0,
                  y: 0,
                  bounce: true,
                  bounceLock: false,
                  momentum: true,
                  lockDirection: true,
                  useTransform: true,
                  useTransition: false,
                  topOffset: 0,
                  checkDOMChanges: false,		// Experimental
                  handleClick: true,
  
                  // Scrollbar
                  hScrollbar: true,
                  vScrollbar: true,
                  fixedScrollbar: isAndroid,
                  hideScrollbar: isIDevice,
                  fadeScrollbar: isIDevice && has3d,
                  scrollbarClass: '',
  
                  // Zoom
                  zoom: false,
                  zoomMin: 1,
                  zoomMax: 4,
                  doubleTapZoom: 2,
                  wheelAction: 'scroll',
  
                  // Snap
                  snap: false,
                  snapThreshold: 1,
  
                  // Events
                  onRefresh: null,
                  onBeforeScrollStart: function (e) { e.preventDefault(); },
                  onScrollStart: null,
                  onBeforeScrollMove: null,
                  onScrollMove: null,
                  onBeforeScrollEnd: null,
                  onScrollEnd: null,
                  onTouchEnd: null,
                  onDestroy: null,
                  onZoomStart: null,
                  onZoom: null,
                  onZoomEnd: null
              };
  
              // User defined options
              for (i in options) that.options[i] = options[i];
  
              // Set starting position
              that.x = that.options.x;
              that.y = that.options.y;
  
              // Normalize options
              that.options.useTransform = hasTransform && that.options.useTransform;
              that.options.hScrollbar = that.options.hScroll && that.options.hScrollbar;
              that.options.vScrollbar = that.options.vScroll && that.options.vScrollbar;
              that.options.zoom = that.options.useTransform && that.options.zoom;
              that.options.useTransition = hasTransitionEnd && that.options.useTransition;
  
              // Helpers FIX ANDROID BUG!
              // translate3d and scale doesn't work together!
              // Ignoring 3d ONLY WHEN YOU SET that.options.zoom
              if (that.options.zoom && isAndroid) {
                  translateZ = '';
              }
  
              // Set some default styles
              that.scroller.style[transitionProperty] = that.options.useTransform ? cssVendor + 'transform' : 'top left';
              that.scroller.style[transitionDuration] = '0';
              that.scroller.style[transformOrigin] = '0 0';
              if (that.options.useTransition) that.scroller.style[transitionTimingFunction] = 'cubic-bezier(0.33,0.66,0.66,1)';
  
              if (that.options.useTransform) that.scroller.style[transform] = 'translate(' + that.x + 'px,' + that.y + 'px)' + translateZ;
              else that.scroller.style.cssText += ';position:absolute;top:' + that.y + 'px;left:' + that.x + 'px';
  
              if (that.options.useTransition) that.options.fixedScrollbar = true;
  
              that.refresh();
  
              that._bind(RESIZE_EV, window);
              that._bind(START_EV);
              if (!hasTouch) {
                  if (that.options.wheelAction != 'none') {
                      that._bind('DOMMouseScroll');
                      that._bind('mousewheel');
                  }
              }
  
              if (that.options.checkDOMChanges) that.checkDOMTime = setInterval(function () {
                  that._checkDOMChanges();
              }, 500);
          };
  
      // Prototype
      iScroll.prototype = {
          enabled: true,
          x: 0,
          y: 0,
          steps: [],
          scale: 1,
          currPageX: 0, currPageY: 0,
          pagesX: [], pagesY: [],
          aniTime: null,
          wheelZoomCount: 0,
  
          handleEvent: function (e) {
              var that = this;
              switch (e.type) {
                  case START_EV:
                      if (!hasTouch && e.button !== 0) return;
                      that._start(e);
                      break;
                  case MOVE_EV: that._move(e); break;
                  case END_EV:
                  case CANCEL_EV: that._end(e); break;
                  case RESIZE_EV: that._resize(); break;
                  case 'DOMMouseScroll': case 'mousewheel': that._wheel(e); break;
                  case TRNEND_EV: that._transitionEnd(e); break;
              }
          },
  
          _checkDOMChanges: function () {
              if (this.moved || this.zoomed || this.animating ||
                  (this.scrollerW == this.scroller.offsetWidth * this.scale && this.scrollerH == this.scroller.offsetHeight * this.scale)) return;
  
              this.refresh();
          },
  
          _scrollbar: function (dir) {
              var that = this,
                  bar;
  
              if (!that[dir + 'Scrollbar']) {
                  if (that[dir + 'ScrollbarWrapper']) {
                      if (hasTransform) that[dir + 'ScrollbarIndicator'].style[transform] = '';
                      that[dir + 'ScrollbarWrapper'].parentNode.removeChild(that[dir + 'ScrollbarWrapper']);
                      that[dir + 'ScrollbarWrapper'] = null;
                      that[dir + 'ScrollbarIndicator'] = null;
                  }
  
                  return;
              }
  
              if (!that[dir + 'ScrollbarWrapper']) {
                  // Create the scrollbar wrapper
                  bar = doc.createElement('div');
  
                  if (that.options.scrollbarClass) bar.className = that.options.scrollbarClass + dir.toUpperCase();
                  else bar.style.cssText = 'position:absolute;z-index:100;' + (dir == 'h' ? 'height:7px;bottom:1px;left:2px;right:' + (that.vScrollbar ? '7' : '2') + 'px' : 'width:7px;bottom:' + (that.hScrollbar ? '7' : '2') + 'px;top:2px;right:1px');
  
                  bar.style.cssText += ';pointer-events:none;' + cssVendor + 'transition-property:opacity;' + cssVendor + 'transition-duration:' + (that.options.fadeScrollbar ? '350ms' : '0') + ';overflow:hidden;opacity:' + (that.options.hideScrollbar ? '0' : '1');
  
                  that.wrapper.appendChild(bar);
                  that[dir + 'ScrollbarWrapper'] = bar;
  
                  // Create the scrollbar indicator
                  bar = doc.createElement('div');
                  if (!that.options.scrollbarClass) {
                      bar.style.cssText = 'position:absolute;z-index:100;background:rgba(0,0,0,0.5);border:1px solid rgba(255,255,255,0.1);right:0px;' + cssVendor + 'background-clip:padding-box;' + cssVendor + 'box-sizing:border-box;' + (dir == 'h' ? 'height:100%' : 'width:100%') + ';' + cssVendor + 'border-radius:3px;border-radius:3px';
                  }
                  bar.style.cssText += ';pointer-events:none;' + cssVendor + 'transition-property:' + cssVendor + 'transform;' + cssVendor + 'transition-timing-function:cubic-bezier(0.33,0.66,0.66,1);' + cssVendor + 'transition-duration:0;' + cssVendor + 'transform: translate(0,0)' + translateZ;
                  if (that.options.useTransition) bar.style.cssText += ';' + cssVendor + 'transition-timing-function:cubic-bezier(0.33,0.66,0.66,1)';
  
                  that[dir + 'ScrollbarWrapper'].appendChild(bar);
                  that[dir + 'ScrollbarIndicator'] = bar;
              }
  
              if (dir == 'h') {
                  that.hScrollbarSize = that.hScrollbarWrapper.clientWidth;
                  that.hScrollbarIndicatorSize = m.max(m.round(that.hScrollbarSize * that.hScrollbarSize / that.scrollerW), 8);
                  that.hScrollbarIndicator.style.width = that.hScrollbarIndicatorSize + 'px';
                  that.hScrollbarMaxScroll = that.hScrollbarSize - that.hScrollbarIndicatorSize;
                  that.hScrollbarProp = that.hScrollbarMaxScroll / that.maxScrollX;
              } else {
                  that.vScrollbarSize = that.vScrollbarWrapper.clientHeight;
                  that.vScrollbarIndicatorSize = m.max(m.round(that.vScrollbarSize * that.vScrollbarSize / that.scrollerH), 8);
                  that.vScrollbarIndicator.style.height = that.vScrollbarIndicatorSize + 'px';
                  that.vScrollbarMaxScroll = that.vScrollbarSize - that.vScrollbarIndicatorSize;
                  that.vScrollbarProp = that.vScrollbarMaxScroll / that.maxScrollY;
              }
  
              // Reset position
              that._scrollbarPos(dir, true);
          },
  
          _resize: function () {
              var that = this;
              setTimeout(function () { that.refresh(); }, isAndroid ? 200 : 0);
          },
  
          _pos: function (x, y) {
              if (this.zoomed) return;
  
              x = this.hScroll ? x : 0;
              y = this.vScroll ? y : 0;
  
              if (this.options.useTransform) {
                  this.scroller.style[transform] = 'translate(' + x + 'px,' + y + 'px) scale(' + this.scale + ')' + translateZ;
              } else {
                  x = m.round(x);
                  y = m.round(y);
                  this.scroller.style.left = x + 'px';
                  this.scroller.style.top = y + 'px';
              }
  
              this.x = x;
              this.y = y;
  
              this._scrollbarPos('h');
              this._scrollbarPos('v');
          },
  
          _scrollbarPos: function (dir, hidden) {
              var that = this,
                  pos = dir == 'h' ? that.x : that.y,
                  size;
  
              if (!that[dir + 'Scrollbar']) return;
  
              pos = that[dir + 'ScrollbarProp'] * pos;
  
              if (pos < 0) {
                  if (!that.options.fixedScrollbar) {
                      size = that[dir + 'ScrollbarIndicatorSize'] + m.round(pos * 3);
                      if (size < 8) size = 8;
                      that[dir + 'ScrollbarIndicator'].style[dir == 'h' ? 'width' : 'height'] = size + 'px';
                  }
                  pos = 0;
              } else if (pos > that[dir + 'ScrollbarMaxScroll']) {
                  if (!that.options.fixedScrollbar) {
                      size = that[dir + 'ScrollbarIndicatorSize'] - m.round((pos - that[dir + 'ScrollbarMaxScroll']) * 3);
                      if (size < 8) size = 8;
                      that[dir + 'ScrollbarIndicator'].style[dir == 'h' ? 'width' : 'height'] = size + 'px';
                      pos = that[dir + 'ScrollbarMaxScroll'] + (that[dir + 'ScrollbarIndicatorSize'] - size);
                  } else {
                      pos = that[dir + 'ScrollbarMaxScroll'];
                  }
              }
  
              that[dir + 'ScrollbarWrapper'].style[transitionDelay] = '0';
              that[dir + 'ScrollbarWrapper'].style.opacity = hidden && that.options.hideScrollbar ? '0' : '1';
              that[dir + 'ScrollbarIndicator'].style[transform] = 'translate(' + (dir == 'h' ? pos + 'px,0)' : '0,' + pos + 'px)') + translateZ;
          },
  
          _start: function (e) {
              var that = this,
                  point = hasTouch ? e.touches[0] : e,
                  matrix, x, y,
                  c1, c2;
  
              if (!that.enabled) return;
  
              if (that.options.onBeforeScrollStart) that.options.onBeforeScrollStart.call(that, e);
  
              if (that.options.useTransition || that.options.zoom) that._transitionTime(0);
  
              that.moved = false;
              that.animating = false;
              that.zoomed = false;
              that.distX = 0;
              that.distY = 0;
              that.absDistX = 0;
              that.absDistY = 0;
              that.dirX = 0;
              that.dirY = 0;
  
              // Gesture start
              if (that.options.zoom && hasTouch && e.touches.length > 1) {
                  c1 = m.abs(e.touches[0].pageX - e.touches[1].pageX);
                  c2 = m.abs(e.touches[0].pageY - e.touches[1].pageY);
                  that.touchesDistStart = m.sqrt(c1 * c1 + c2 * c2);
  
                  that.originX = m.abs(e.touches[0].pageX + e.touches[1].pageX - that.wrapperOffsetLeft * 2) / 2 - that.x;
                  that.originY = m.abs(e.touches[0].pageY + e.touches[1].pageY - that.wrapperOffsetTop * 2) / 2 - that.y;
  
                  if (that.options.onZoomStart) that.options.onZoomStart.call(that, e);
              }
  
              if (that.options.momentum) {
                  if (that.options.useTransform) {
                      // Very lame general purpose alternative to CSSMatrix
                      matrix = getComputedStyle(that.scroller, null)[transform].replace(/[^0-9\-.,]/g, '').split(',');
                      x = +(matrix[12] || matrix[4]);
                      y = +(matrix[13] || matrix[5]);
                  } else {
                      x = +getComputedStyle(that.scroller, null).left.replace(/[^0-9-]/g, '');
                      y = +getComputedStyle(that.scroller, null).top.replace(/[^0-9-]/g, '');
                  }
  
                  if (x != that.x || y != that.y) {
                      if (that.options.useTransition) that._unbind(TRNEND_EV);
                      else cancelFrame(that.aniTime);
                      that.steps = [];
                      that._pos(x, y);
                      if (that.options.onScrollEnd) that.options.onScrollEnd.call(that);
                  }
              }
  
              that.absStartX = that.x;	// Needed by snap threshold
              that.absStartY = that.y;
  
              that.startX = that.x;
              that.startY = that.y;
              that.pointX = point.pageX;
              that.pointY = point.pageY;
  
              that.startTime = e.timeStamp || Date.now();
  
              if (that.options.onScrollStart) that.options.onScrollStart.call(that, e);
  
              that._bind(MOVE_EV, window);
              that._bind(END_EV, window);
              that._bind(CANCEL_EV, window);
          },
  
          _move: function (e) {
              var that = this,
                  point = hasTouch ? e.touches[0] : e,
                  deltaX = point.pageX - that.pointX,
                  deltaY = point.pageY - that.pointY,
                  newX = that.x + deltaX,
                  newY = that.y + deltaY,
                  c1, c2, scale,
                  timestamp = e.timeStamp || Date.now();
  
              if (that.options.onBeforeScrollMove) that.options.onBeforeScrollMove.call(that, e);
  
              // Zoom
              if (that.options.zoom && hasTouch && e.touches.length > 1) {
                  c1 = m.abs(e.touches[0].pageX - e.touches[1].pageX);
                  c2 = m.abs(e.touches[0].pageY - e.touches[1].pageY);
                  that.touchesDist = m.sqrt(c1 * c1 + c2 * c2);
  
                  that.zoomed = true;
  
                  scale = 1 / that.touchesDistStart * that.touchesDist * this.scale;
  
                  if (scale < that.options.zoomMin) scale = 0.5 * that.options.zoomMin * Math.pow(2.0, scale / that.options.zoomMin);
                  else if (scale > that.options.zoomMax) scale = 2.0 * that.options.zoomMax * Math.pow(0.5, that.options.zoomMax / scale);
  
                  that.lastScale = scale / this.scale;
  
                  newX = this.originX - this.originX * that.lastScale + this.x;
                  newY = this.originY - this.originY * that.lastScale + this.y;
  
                  this.scroller.style[transform] = 'translate(' + newX + 'px,' + newY + 'px) scale(' + scale + ')' + translateZ;
  
                  if (that.options.onZoom) that.options.onZoom.call(that, e);
                  return;
              }
  
              that.pointX = point.pageX;
              that.pointY = point.pageY;
  
              // Slow down if outside of the boundaries
              if (newX > 0 || newX < that.maxScrollX) {
                  newX = that.options.bounce ? that.x + (deltaX / 2) : newX >= 0 || that.maxScrollX >= 0 ? 0 : that.maxScrollX;
              }
              if (newY > that.minScrollY || newY < that.maxScrollY) {
                  newY = that.options.bounce ? that.y + (deltaY / 2) : newY >= that.minScrollY || that.maxScrollY >= 0 ? that.minScrollY : that.maxScrollY;
              }
  
              that.distX += deltaX;
              that.distY += deltaY;
              that.absDistX = m.abs(that.distX);
              that.absDistY = m.abs(that.distY);
  
              if (that.absDistX < 6 && that.absDistY < 6) {
                  return;
              }
  
              // Lock direction
              if (that.options.lockDirection) {
                  if (that.absDistX > that.absDistY + 5) {
                      newY = that.y;
                      deltaY = 0;
                  } else if (that.absDistY > that.absDistX + 5) {
                      newX = that.x;
                      deltaX = 0;
                  }
              }
  
              that.moved = true;
              that._pos(newX, newY);
              that.dirX = deltaX > 0 ? -1 : deltaX < 0 ? 1 : 0;
              that.dirY = deltaY > 0 ? -1 : deltaY < 0 ? 1 : 0;
  
              if (timestamp - that.startTime > 300) {
                  that.startTime = timestamp;
                  that.startX = that.x;
                  that.startY = that.y;
              }
  
              if (that.options.onScrollMove) that.options.onScrollMove.call(that, e);
          },
  
          _end: function (e) {
              if (hasTouch && e.touches.length !== 0) return;
  
              var that = this,
                  point = hasTouch ? e.changedTouches[0] : e,
                  target, ev,
                  momentumX = { dist: 0, time: 0 },
                  momentumY = { dist: 0, time: 0 },
                  duration = (e.timeStamp || Date.now()) - that.startTime,
                  newPosX = that.x,
                  newPosY = that.y,
                  distX, distY,
                  newDuration,
                  snap,
                  scale;
  
              that._unbind(MOVE_EV, window);
              that._unbind(END_EV, window);
              that._unbind(CANCEL_EV, window);
  
              if (that.options.onBeforeScrollEnd) that.options.onBeforeScrollEnd.call(that, e);
  
              if (that.zoomed) {
                  scale = that.scale * that.lastScale;
                  scale = Math.max(that.options.zoomMin, scale);
                  scale = Math.min(that.options.zoomMax, scale);
                  that.lastScale = scale / that.scale;
                  that.scale = scale;
  
                  that.x = that.originX - that.originX * that.lastScale + that.x;
                  that.y = that.originY - that.originY * that.lastScale + that.y;
  
                  that.scroller.style[transitionDuration] = '200ms';
                  that.scroller.style[transform] = 'translate(' + that.x + 'px,' + that.y + 'px) scale(' + that.scale + ')' + translateZ;
  
                  that.zoomed = false;
                  that.refresh();
  
                  if (that.options.onZoomEnd) that.options.onZoomEnd.call(that, e);
                  return;
              }
  
              if (!that.moved) {
                  if (hasTouch) {
                      if (that.doubleTapTimer && that.options.zoom) {
                          // Double tapped
                          clearTimeout(that.doubleTapTimer);
                          that.doubleTapTimer = null;
                          if (that.options.onZoomStart) that.options.onZoomStart.call(that, e);
                          that.zoom(that.pointX, that.pointY, that.scale == 1 ? that.options.doubleTapZoom : 1);
                          if (that.options.onZoomEnd) {
                              setTimeout(function () {
                                  that.options.onZoomEnd.call(that, e);
                              }, 200); // 200 is default zoom duration
                          }
                      } else if (this.options.handleClick) {
                          that.doubleTapTimer = setTimeout(function () {
                              that.doubleTapTimer = null;
  
                              // Find the last touched element
                              target = point.target;
                              while (target.nodeType != 1) target = target.parentNode;
  
                              if (target.tagName != 'SELECT' && target.tagName != 'INPUT' && target.tagName != 'TEXTAREA') {
                                  ev = doc.createEvent('MouseEvents');
                                  ev.initMouseEvent('click', true, true, e.view, 1,
                                      point.screenX, point.screenY, point.clientX, point.clientY,
                                      e.ctrlKey, e.altKey, e.shiftKey, e.metaKey,
                                      0, null);
                                  ev._fake = true;
                                  target.dispatchEvent(ev);
                              }
                          }, that.options.zoom ? 250 : 0);
                      }
                  }
  
                  that._resetPos(400);
  
                  if (that.options.onTouchEnd) that.options.onTouchEnd.call(that, e);
                  return;
              }
  
              if (duration < 300 && that.options.momentum) {
                  momentumX = newPosX ? that._momentum(newPosX - that.startX, duration, -that.x, that.scrollerW - that.wrapperW + that.x, that.options.bounce ? that.wrapperW : 0) : momentumX;
                  momentumY = newPosY ? that._momentum(newPosY - that.startY, duration, -that.y, (that.maxScrollY < 0 ? that.scrollerH - that.wrapperH + that.y - that.minScrollY : 0), that.options.bounce ? that.wrapperH : 0) : momentumY;
  
                  newPosX = that.x + momentumX.dist;
                  newPosY = that.y + momentumY.dist;
  
                  if ((that.x > 0 && newPosX > 0) || (that.x < that.maxScrollX && newPosX < that.maxScrollX)) momentumX = { dist: 0, time: 0 };
                  if ((that.y > that.minScrollY && newPosY > that.minScrollY) || (that.y < that.maxScrollY && newPosY < that.maxScrollY)) momentumY = { dist: 0, time: 0 };
              }
  
              if (momentumX.dist || momentumY.dist) {
                  newDuration = m.max(m.max(momentumX.time, momentumY.time), 10);
  
                  // Do we need to snap?
                  if (that.options.snap) {
                      distX = newPosX - that.absStartX;
                      distY = newPosY - that.absStartY;
                      if (m.abs(distX) < that.options.snapThreshold && m.abs(distY) < that.options.snapThreshold) { that.scrollTo(that.absStartX, that.absStartY, 200); }
                      else {
                          snap = that._snap(newPosX, newPosY);
                          newPosX = snap.x;
                          newPosY = snap.y;
                          newDuration = m.max(snap.time, newDuration);
                      }
                  }
  
                  that.scrollTo(m.round(newPosX), m.round(newPosY), newDuration);
  
                  if (that.options.onTouchEnd) that.options.onTouchEnd.call(that, e);
                  return;
              }
  
              // Do we need to snap?
              if (that.options.snap) {
                  distX = newPosX - that.absStartX;
                  distY = newPosY - that.absStartY;
                  if (m.abs(distX) < that.options.snapThreshold && m.abs(distY) < that.options.snapThreshold) that.scrollTo(that.absStartX, that.absStartY, 200);
                  else {
                      snap = that._snap(that.x, that.y);
                      if (snap.x != that.x || snap.y != that.y) that.scrollTo(snap.x, snap.y, snap.time);
                  }
  
                  if (that.options.onTouchEnd) that.options.onTouchEnd.call(that, e);
                  return;
              }
  
              that._resetPos(200);
              if (that.options.onTouchEnd) that.options.onTouchEnd.call(that, e);
          },
  
          _resetPos: function (time) {
              var that = this,
                  resetX = that.x >= 0 ? 0 : that.x < that.maxScrollX ? that.maxScrollX : that.x,
                  resetY = that.y >= that.minScrollY || that.maxScrollY > 0 ? that.minScrollY : that.y < that.maxScrollY ? that.maxScrollY : that.y;
  
              if (resetX == that.x && resetY == that.y) {
                  if (that.moved) {
                      that.moved = false;
                      if (that.options.onScrollEnd) that.options.onScrollEnd.call(that);		// Execute custom code on scroll end
                  }
  
                  if (that.hScrollbar && that.options.hideScrollbar) {
                      if (vendor == 'webkit') that.hScrollbarWrapper.style[transitionDelay] = '300ms';
                      that.hScrollbarWrapper.style.opacity = '0';
                  }
                  if (that.vScrollbar && that.options.hideScrollbar) {
                      if (vendor == 'webkit') that.vScrollbarWrapper.style[transitionDelay] = '300ms';
                      that.vScrollbarWrapper.style.opacity = '0';
                  }
  
                  return;
              }
  
              that.scrollTo(resetX, resetY, time || 0);
          },
  
          _wheel: function (e) {
              var that = this,
                  wheelDeltaX, wheelDeltaY,
                  deltaX, deltaY,
                  deltaScale;
  
              if ('wheelDeltaX' in e) {
                  wheelDeltaX = e.wheelDeltaX / 12;
                  wheelDeltaY = e.wheelDeltaY / 12;
              } else if ('wheelDelta' in e) {
                  wheelDeltaX = wheelDeltaY = e.wheelDelta / 12;
              } else if ('detail' in e) {
                  wheelDeltaX = wheelDeltaY = -e.detail * 3;
              } else {
                  return;
              }
  
              if (that.options.wheelAction == 'zoom') {
                  deltaScale = that.scale * Math.pow(2, 1 / 3 * (wheelDeltaY ? wheelDeltaY / Math.abs(wheelDeltaY) : 0));
                  if (deltaScale < that.options.zoomMin) deltaScale = that.options.zoomMin;
                  if (deltaScale > that.options.zoomMax) deltaScale = that.options.zoomMax;
  
                  if (deltaScale != that.scale) {
                      if (!that.wheelZoomCount && that.options.onZoomStart) that.options.onZoomStart.call(that, e);
                      that.wheelZoomCount++;
  
                      that.zoom(e.pageX, e.pageY, deltaScale, 400);
  
                      setTimeout(function () {
                          that.wheelZoomCount--;
                          if (!that.wheelZoomCount && that.options.onZoomEnd) that.options.onZoomEnd.call(that, e);
                      }, 400);
                  }
  
                  return;
              }
  
              deltaX = that.x + wheelDeltaX;
              deltaY = that.y + wheelDeltaY;
  
              if (deltaX > 0) deltaX = 0;
              else if (deltaX < that.maxScrollX) deltaX = that.maxScrollX;
  
              if (deltaY > that.minScrollY) deltaY = that.minScrollY;
              else if (deltaY < that.maxScrollY) deltaY = that.maxScrollY;
  
              if (that.maxScrollY < 0) {
                  that.scrollTo(deltaX, deltaY, 0);
              }
          },
  
          _transitionEnd: function (e) {
              var that = this;
  
              if (e.target != that.scroller) return;
  
              that._unbind(TRNEND_EV);
  
              that._startAni();
          },
  
  
          /**
          *
          * Utilities
          *
          */
          _startAni: function () {
              var that = this,
                  startX = that.x, startY = that.y,
                  startTime = Date.now(),
                  step, easeOut,
                  animate;
  
              if (that.animating) return;
  
              if (!that.steps.length) {
                  that._resetPos(400);
                  return;
              }
  
              step = that.steps.shift();
  
              if (step.x == startX && step.y == startY) step.time = 0;
  
              that.animating = true;
              that.moved = true;
  
              if (that.options.useTransition) {
                  that._transitionTime(step.time);
                  that._pos(step.x, step.y);
                  that.animating = false;
                  if (step.time) that._bind(TRNEND_EV);
                  else that._resetPos(0);
                  return;
              }
  
              animate = function () {
                  var now = Date.now(),
                      newX, newY;
  
                  if (now >= startTime + step.time) {
                      that._pos(step.x, step.y);
                      that.animating = false;
                      if (that.options.onAnimationEnd) that.options.onAnimationEnd.call(that);			// Execute custom code on animation end
                      that._startAni();
                      return;
                  }
  
                  now = (now - startTime) / step.time - 1;
                  easeOut = m.sqrt(1 - now * now);
                  newX = (step.x - startX) * easeOut + startX;
                  newY = (step.y - startY) * easeOut + startY;
                  that._pos(newX, newY);
                  if (that.animating) that.aniTime = nextFrame(animate);
              };
  
              animate();
          },
  
          _transitionTime: function (time) {
              time += 'ms';
              this.scroller.style[transitionDuration] = time;
              if (this.hScrollbar) this.hScrollbarIndicator.style[transitionDuration] = time;
              if (this.vScrollbar) this.vScrollbarIndicator.style[transitionDuration] = time;
          },
  
          _momentum: function (dist, time, maxDistUpper, maxDistLower, size) {
              var deceleration = 0.0006,
                  speed = m.abs(dist) / time,
                  newDist = (speed * speed) / (2 * deceleration),
                  newTime = 0, outsideDist = 0;
  
              // Proportinally reduce speed if we are outside of the boundaries
              if (dist > 0 && newDist > maxDistUpper) {
                  outsideDist = size / (6 / (newDist / speed * deceleration));
                  maxDistUpper = maxDistUpper + outsideDist;
                  speed = speed * maxDistUpper / newDist;
                  newDist = maxDistUpper;
              } else if (dist < 0 && newDist > maxDistLower) {
                  outsideDist = size / (6 / (newDist / speed * deceleration));
                  maxDistLower = maxDistLower + outsideDist;
                  speed = speed * maxDistLower / newDist;
                  newDist = maxDistLower;
              }
  
              newDist = newDist * (dist < 0 ? -1 : 1);
              newTime = speed / deceleration;
  
              return { dist: newDist, time: m.round(newTime) };
          },
  
          _offset: function (el) {
              var left = -el.offsetLeft,
                  top = -el.offsetTop;
  
              while (el = el.offsetParent) {
                  left -= el.offsetLeft;
                  top -= el.offsetTop;
              }
  
              if (el != this.wrapper) {
                  left *= this.scale;
                  top *= this.scale;
              }
  
              return { left: left, top: top };
          },
  
          _snap: function (x, y) {
              var that = this,
                  i, l,
                  page, time,
                  sizeX, sizeY;
  
              // Check page X
              page = that.pagesX.length - 1;
              for (i = 0, l = that.pagesX.length; i < l; i++) {
                  if (x >= that.pagesX[i]) {
                      page = i;
                      break;
                  }
              }
              if (page == that.currPageX && page > 0 && that.dirX < 0) page--;
              x = that.pagesX[page];
              sizeX = m.abs(x - that.pagesX[that.currPageX]);
              sizeX = sizeX ? m.abs(that.x - x) / sizeX * 500 : 0;
              that.currPageX = page;
  
              // Check page Y
              page = that.pagesY.length - 1;
              for (i = 0; i < page; i++) {
                  if (y >= that.pagesY[i]) {
                      page = i;
                      break;
                  }
              }
              if (page == that.currPageY && page > 0 && that.dirY < 0) page--;
              y = that.pagesY[page];
              sizeY = m.abs(y - that.pagesY[that.currPageY]);
              sizeY = sizeY ? m.abs(that.y - y) / sizeY * 500 : 0;
              that.currPageY = page;
  
              // Snap with constant speed (proportional duration)
              time = m.round(m.max(sizeX, sizeY)) || 200;
  
              return { x: x, y: y, time: time };
          },
  
          _bind: function (type, el, bubble) {
              (el || this.scroller).addEventListener(type, this, !!bubble);
          },
  
          _unbind: function (type, el, bubble) {
              (el || this.scroller).removeEventListener(type, this, !!bubble);
          },
  
  
          /**
          *
          * Public methods
          *
          */
          destroy: function () {
              var that = this;
  
              that.scroller.style[transform] = '';
  
              // Remove the scrollbars
              that.hScrollbar = false;
              that.vScrollbar = false;
              that._scrollbar('h');
              that._scrollbar('v');
  
              // Remove the event listeners
              that._unbind(RESIZE_EV, window);
              that._unbind(START_EV);
              that._unbind(MOVE_EV, window);
              that._unbind(END_EV, window);
              that._unbind(CANCEL_EV, window);
  
              if (!that.options.hasTouch) {
                  that._unbind('DOMMouseScroll');
                  that._unbind('mousewheel');
              }
  
              if (that.options.useTransition) that._unbind(TRNEND_EV);
  
              if (that.options.checkDOMChanges) clearInterval(that.checkDOMTime);
  
              if (that.options.onDestroy) that.options.onDestroy.call(that);
          },
  
          refresh: function () {
              var that = this,
                  offset,
                  i, l,
                  els,
                  pos = 0,
                  page = 0;
  
              if (that.scale < that.options.zoomMin) that.scale = that.options.zoomMin;
              that.wrapperW = that.wrapper.clientWidth || 1;
              that.wrapperH = that.wrapper.clientHeight || 1;
  
              that.minScrollY = -that.options.topOffset || 0;
              that.scrollerW = m.round(that.scroller.offsetWidth * that.scale);
              that.scrollerH = m.round((that.scroller.offsetHeight + that.minScrollY) * that.scale);
              that.maxScrollX = that.wrapperW - that.scrollerW;
              that.maxScrollY = that.wrapperH - that.scrollerH + that.minScrollY;
              that.dirX = 0;
              that.dirY = 0;
  
              if (that.options.onRefresh) that.options.onRefresh.call(that);
  
              that.hScroll = that.options.hScroll && that.maxScrollX < 0;
              that.vScroll = that.options.vScroll && (!that.options.bounceLock && !that.hScroll || that.scrollerH > that.wrapperH);
  
              that.hScrollbar = that.hScroll && that.options.hScrollbar;
              that.vScrollbar = that.vScroll && that.options.vScrollbar && that.scrollerH > that.wrapperH;
  
              offset = that._offset(that.wrapper);
              that.wrapperOffsetLeft = -offset.left;
              that.wrapperOffsetTop = -offset.top;
  
              // Prepare snap
              if (typeof that.options.snap == 'string') {
                  that.pagesX = [];
                  that.pagesY = [];
                  els = that.scroller.querySelectorAll(that.options.snap);
                  for (i = 0, l = els.length; i < l; i++) {
                      pos = that._offset(els[i]);
                      pos.left += that.wrapperOffsetLeft;
                      pos.top += that.wrapperOffsetTop;
                      that.pagesX[i] = pos.left < that.maxScrollX ? that.maxScrollX : pos.left * that.scale;
                      that.pagesY[i] = pos.top < that.maxScrollY ? that.maxScrollY : pos.top * that.scale;
                  }
              } else if (that.options.snap) {
                  that.pagesX = [];
                  while (pos >= that.maxScrollX) {
                      that.pagesX[page] = pos;
                      pos = pos - that.wrapperW;
                      page++;
                  }
                  if (that.maxScrollX % that.wrapperW) that.pagesX[that.pagesX.length] = that.maxScrollX - that.pagesX[that.pagesX.length - 1] + that.pagesX[that.pagesX.length - 1];
  
                  pos = 0;
                  page = 0;
                  that.pagesY = [];
                  while (pos >= that.maxScrollY) {
                      that.pagesY[page] = pos;
                      pos = pos - that.wrapperH;
                      page++;
                  }
                  if (that.maxScrollY % that.wrapperH) that.pagesY[that.pagesY.length] = that.maxScrollY - that.pagesY[that.pagesY.length - 1] + that.pagesY[that.pagesY.length - 1];
              }
  
              // Prepare the scrollbars
              that._scrollbar('h');
              that._scrollbar('v');
  
              if (!that.zoomed) {
                  that.scroller.style[transitionDuration] = '0';
                  that._resetPos(400);
              }
          },
  
          scrollTo: function (x, y, time, relative) {
              var that = this,
                  step = x,
                  i, l;
  
              that.stop();
  
              if (!step.length) step = [{ x: x, y: y, time: time, relative: relative }];
  
              for (i = 0, l = step.length; i < l; i++) {
                  if (step[i].relative) { step[i].x = that.x - step[i].x; step[i].y = that.y - step[i].y; }
                  that.steps.push({ x: step[i].x, y: step[i].y, time: step[i].time || 0 });
              }
  
              that._startAni();
          },
  
          scrollToElement: function (el, time) {
              var that = this, pos;
              el = el.nodeType ? el : that.scroller.querySelector(el);
              if (!el) return;
  
              pos = that._offset(el);
              pos.left += that.wrapperOffsetLeft;
              pos.top += that.wrapperOffsetTop;
  
              pos.left = pos.left > 0 ? 0 : pos.left < that.maxScrollX ? that.maxScrollX : pos.left;
              pos.top = pos.top > that.minScrollY ? that.minScrollY : pos.top < that.maxScrollY ? that.maxScrollY : pos.top;
              time = time === undefined ? m.max(m.abs(pos.left) * 2, m.abs(pos.top) * 2) : time;
  
              that.scrollTo(pos.left, pos.top, time);
          },
  
          scrollToPage: function (pageX, pageY, time) {
              var that = this, x, y;
  
              time = time === undefined ? 400 : time;
  
              if (that.options.onScrollStart) that.options.onScrollStart.call(that);
  
              if (that.options.snap) {
                  pageX = pageX == 'next' ? that.currPageX + 1 : pageX == 'prev' ? that.currPageX - 1 : pageX;
                  pageY = pageY == 'next' ? that.currPageY + 1 : pageY == 'prev' ? that.currPageY - 1 : pageY;
  
                  pageX = pageX < 0 ? 0 : pageX > that.pagesX.length - 1 ? that.pagesX.length - 1 : pageX;
                  pageY = pageY < 0 ? 0 : pageY > that.pagesY.length - 1 ? that.pagesY.length - 1 : pageY;
  
                  that.currPageX = pageX;
                  that.currPageY = pageY;
                  x = that.pagesX[pageX];
                  y = that.pagesY[pageY];
              } else {
                  x = -that.wrapperW * pageX;
                  y = -that.wrapperH * pageY;
                  if (x < that.maxScrollX) x = that.maxScrollX;
                  if (y < that.maxScrollY) y = that.maxScrollY;
              }
  
              that.scrollTo(x, y, time);
          },
  
          disable: function () {
              this.stop();
              this._resetPos(0);
              this.enabled = false;
  
              // If disabled after touchstart we make sure that there are no left over events
              this._unbind(MOVE_EV, window);
              this._unbind(END_EV, window);
              this._unbind(CANCEL_EV, window);
          },
  
          enable: function () {
              this.enabled = true;
          },
  
          stop: function () {
              if (this.options.useTransition) this._unbind(TRNEND_EV);
              else cancelFrame(this.aniTime);
              this.steps = [];
              this.moved = false;
              this.animating = false;
          },
  
          zoom: function (x, y, scale, time) {
              var that = this,
                  relScale = scale / that.scale;
  
              if (!that.options.useTransform) return;
  
              that.zoomed = true;
              time = time === undefined ? 200 : time;
              x = x - that.wrapperOffsetLeft - that.x;
              y = y - that.wrapperOffsetTop - that.y;
              that.x = x - x * relScale + that.x;
              that.y = y - y * relScale + that.y;
  
              that.scale = scale;
              that.refresh();
  
              that.x = that.x > 0 ? 0 : that.x < that.maxScrollX ? that.maxScrollX : that.x;
              that.y = that.y > that.minScrollY ? that.minScrollY : that.y < that.maxScrollY ? that.maxScrollY : that.y;
  
              that.scroller.style[transitionDuration] = time + 'ms';
              that.scroller.style[transform] = 'translate(' + that.x + 'px,' + that.y + 'px) scale(' + scale + ')' + translateZ;
              that.zoomed = false;
          },
  
          isReady: function () {
              return !this.moved && !this.zoomed && !this.animating;
          }
      };
  
      function prefixStyle(style) {
          if (vendor === '') return style;
  
          style = style.charAt(0).toUpperCase() + style.substr(1);
          return vendor + style;
      }
  
      dummyStyle = null;	// for the sake of it
  
      if (typeof exports !== 'undefined') exports.iScroll = iScroll;
      else window.iScroll = iScroll;
  
  })(window, document);