git.roojs.org Git - roojs1/blob - ux/Iscroll.js

   1 /*!
   2  * iScroll v4.1.9 ~ Copyright (c) 2011 Matteo Spinelli, http://cubiq.org
   3  * Released under MIT license, http://cubiq.org/license
   4  */
   5
   6 // should we even bother...???
   7 Roo.namespace('Roo.ux');
   8
   9 (function(){
  10     var m = Math,
  11         vendor = (/webkit/i).test(navigator.appVersion) ? 'webkit' :
  12             (/firefox/i).test(navigator.userAgent) ? 'Moz' :
  13             'opera' in window ? 'O' : '',
  14
  15         // Browser capabilities
  16         has3d = 'WebKitCSSMatrix' in window && 'm11' in new WebKitCSSMatrix(),
  17         hasTouch = 'ontouchstart' in window,
  18         hasTransform = vendor + 'Transform' in document.documentElement.style,
  19         isAndroid = (/android/gi).test(navigator.appVersion),
  20         isIDevice = (/iphone|ipad/gi).test(navigator.appVersion),
  21         isPlaybook = (/playbook/gi).test(navigator.appVersion),
  22         hasTransitionEnd = isIDevice || isPlaybook,
  23         nextFrame = (function() {
  24             return window.requestAnimationFrame
  25                 || window.webkitRequestAnimationFrame
  26                 || window.mozRequestAnimationFrame
  27                 || window.oRequestAnimationFrame
  28                 || window.msRequestAnimationFrame
  29                 || function(callback) { return setTimeout(callback, 1); }
  30         })(),
  31         cancelFrame = (function () {
  32             return window.cancelRequestAnimationFrame
  33                 || window.webkitCancelRequestAnimationFrame
  34                 || window.mozCancelRequestAnimationFrame
  35                 || window.oCancelRequestAnimationFrame
  36                 || window.msCancelRequestAnimationFrame
  37                 || clearTimeout
  38         })(),
  39
  40         // Events
  41         RESIZE_EV = 'onorientationchange' in window ? 'orientationchange' : 'resize',
  42         START_EV = hasTouch ? 'touchstart' : 'mousedown',
  43         MOVE_EV = hasTouch ? 'touchmove' : 'mousemove',
  44         END_EV = hasTouch ? 'touchend' : 'mouseup',
  45         CANCEL_EV = hasTouch ? 'touchcancel' : 'mouseup',
  46         WHEEL_EV = vendor == 'Moz' ? 'DOMMouseScroll' : 'mousewheel',
  47
  48         // Helpers
  49         trnOpen = 'translate' + (has3d ? '3d(' : '('),
  50         trnClose = has3d ? ',0)' : ')';
  51
  52         // Constructor
  53 Roo.ux.iScroll = function (el, options) {
  54                 var that = this,
  55                         doc = document,
  56                         i;
  57
  58
  59         that.wrapper = typeof el == 'object' ? el : doc.getElementById(el);
  60
  61                 that.wrapper.style.overflow = 'hidden';
  62                 that.scroller = that.wrapper.children[0];
  63
  64
  65
  66
  67                 // Default options
  68                 that.options = {
  69                         hScroll: true,
  70                         vScroll: true,
  71                         bounce: true,
  72                         bounceLock: false,
  73                         momentum: true,
  74                         lockDirection: true,
  75                         useTransform: true,
  76                         useTransition: false,
  77                         topOffset: 0,
  78                         checkDOMChanges: false,         // Experimental
  79
  80                         // Scrollbar
  81                         hScrollbar: true,
  82                         vScrollbar: true,
  83                         fixedScrollbar: isAndroid,
  84                         hideScrollbar: isIDevice,
  85                         fadeScrollbar: isIDevice && has3d,
  86                         scrollbarClass: '',
  87
  88                         // Zoom
  89                         zoom: false,
  90                         zoomMin: 1,
  91                         zoomMax: 4,
  92                         doubleTapZoom: 2,
  93                         wheelAction: 'scroll',
  94
  95                         // Snap
  96                         snap: false,
  97                         snapThreshold: 1,
  98
  99                         // Events
 100                         onRefresh: null,
 101                         onBeforeScrollStart: function (e) { e.preventDefault(); },
 102                         onScrollStart: null,
 103                         onBeforeScrollMove: null,
 104                         onScrollMove: null,
 105                         onBeforeScrollEnd: null,
 106                         onScrollEnd: null,
 107                         onTouchEnd: null,
 108                         onDestroy: null,
 109                         onZoomStart: null,
 110                         onZoom: null,
 111                         onZoomEnd: null
 112                 };
 113
 114                 // User defined options
 115                 for (i in options) that.options[i] = options[i];
 116
 117                 // Normalize options
 118                 that.options.useTransform = hasTransform ? that.options.useTransform : false;
 119                 that.options.hScrollbar = that.options.hScroll && that.options.hScrollbar;
 120                 that.options.vScrollbar = that.options.vScroll && that.options.vScrollbar;
 121                 that.options.zoom = that.options.useTransform && that.options.zoom;
 122                 that.options.useTransition = hasTransitionEnd && that.options.useTransition;
 123
 124                 // Set some default styles
 125                 that.scroller.style[vendor + 'TransitionProperty'] = that.options.useTransform ? '-' + vendor.toLowerCase() + '-transform' : 'top left';
 126                 that.scroller.style[vendor + 'TransitionDuration'] = '0';
 127                 that.scroller.style[vendor + 'TransformOrigin'] = '0 0';
 128                 if (that.options.useTransition) that.scroller.style[vendor + 'TransitionTimingFunction'] = 'cubic-bezier(0.33,0.66,0.66,1)';
 129
 130                 if (that.options.useTransform) that.scroller.style[vendor + 'Transform'] = trnOpen + '0,0' + trnClose;
 131                 else that.scroller.style.cssText += ';position:absolute;top:0;left:0';
 132
 133                 if (that.options.useTransition) that.options.fixedScrollbar = true;
 134
 135                 that.refresh();
 136
 137                 that._bind(RESIZE_EV, window);
 138                 that._bind(START_EV);
 139                 if (!hasTouch) {
 140                         that._bind('mouseout', that.wrapper);
 141                         that._bind(WHEEL_EV);
 142                 }
 143
 144                 if (that.options.checkDOMChanges) that.checkDOMTime = setInterval(function () {
 145                         that._checkDOMChanges();
 146                 }, 500);
 147         };
 148
 149 // Prototype
 150 Roo.ux.iScroll.prototype = {
 151         enabled: true,
 152         x: 0,
 153         y: 0,
 154         steps: [],
 155         scale: 1,
 156         currPageX: 0, currPageY: 0,
 157         pagesX: [], pagesY: [],
 158         aniTime: null,
 159         wheelZoomCount: 0,
 160
 161         handleEvent: function (e) {
 162                 var that = this;
 163                 switch(e.type) {
 164                         case START_EV:
 165                                 if (!hasTouch && e.button !== 0) return;
 166                                 that._start(e);
 167                                 break;
 168                         case MOVE_EV: that._move(e); break;
 169                         case END_EV:
 170                         case CANCEL_EV: that._end(e); break;
 171                         case RESIZE_EV: that._resize(); break;
 172                         case WHEEL_EV: that._wheel(e); break;
 173                         case 'mouseout': that._mouseout(e); break;
 174                         case 'webkitTransitionEnd': that._transitionEnd(e); break;
 175                 }
 176         },
 177
 178         _checkDOMChanges: function () {
 179                 if (this.moved || this.zoomed || this.animating ||
 180                         (this.scrollerW == this.scroller.offsetWidth * this.scale && this.scrollerH == this.scroller.offsetHeight * this.scale)) return;
 181
 182                 this.refresh();
 183         },
 184
 185         _scrollbar: function (dir) {
 186                 var that = this,
 187                         doc = document,
 188                         bar;
 189
 190                 if (!that[dir + 'Scrollbar']) {
 191                         if (that[dir + 'ScrollbarWrapper']) {
 192                                 if (hasTransform) that[dir + 'ScrollbarIndicator'].style[vendor + 'Transform'] = '';
 193                                 that[dir + 'ScrollbarWrapper'].parentNode.removeChild(that[dir + 'ScrollbarWrapper']);
 194                                 that[dir + 'ScrollbarWrapper'] = null;
 195                                 that[dir + 'ScrollbarIndicator'] = null;
 196                         }
 197
 198                         return;
 199                 }
 200
 201                 if (!that[dir + 'ScrollbarWrapper']) {
 202                         // Create the scrollbar wrapper
 203                         bar = doc.createElement('div');
 204
 205                         if (that.options.scrollbarClass) bar.className = that.options.scrollbarClass + dir.toUpperCase();
 206                         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');
 207
 208                         bar.style.cssText += ';pointer-events:none;-' +
 209                     vendor + '-transition-property:opacity;-' +
 210                     vendor + '-transition-duration:' + (that.options.fadeScrollbar ? '350ms' : '0') +
 211                     ';overflow:hidden;opacity:' + (that.options.hideScrollbar ? '0' : '1');
 212
 213                         that.wrapper.appendChild(bar);
 214                         that[dir + 'ScrollbarWrapper'] = bar;
 215
 216                         // Create the scrollbar indicator
 217                         bar = doc.createElement('div');
 218                         if (!that.options.scrollbarClass) {
 219                                 bar.style.cssText = 'position:absolute;z-index:100;background:rgba(0,0,0,0.5);border:1px solid rgba(255,255,255,0.9);-' + vendor + '-background-clip:padding-box;-' + vendor + '-box-sizing:border-box;' + (dir == 'h' ? 'height:100%' : 'width:100%') + ';-' + vendor + '-border-radius:3px;border-radius:3px';
 220                         }
 221                         bar.style.cssText += ';pointer-events:none;-' + vendor + '-transition-property:-' + vendor + '-transform;-' + vendor + '-transition-timing-function:cubic-bezier(0.33,0.66,0.66,1);-' + vendor + '-transition-duration:0;-' + vendor + '-transform:' + trnOpen + '0,0' + trnClose;
 222                         if (that.options.useTransition) bar.style.cssText += ';-' + vendor + '-transition-timing-function:cubic-bezier(0.33,0.66,0.66,1)';
 223
 224                         that[dir + 'ScrollbarWrapper'].appendChild(bar);
 225                         that[dir + 'ScrollbarIndicator'] = bar;
 226                 }
 227
 228                 if (dir == 'h') {
 229                         that.hScrollbarSize = that.hScrollbarWrapper.clientWidth;
 230                         that.hScrollbarIndicatorSize = m.max(m.round(that.hScrollbarSize * that.hScrollbarSize / that.scrollerW), 8);
 231                         that.hScrollbarIndicator.style.width = that.hScrollbarIndicatorSize + 'px';
 232                         that.hScrollbarMaxScroll = that.hScrollbarSize - that.hScrollbarIndicatorSize;
 233                         that.hScrollbarProp = that.hScrollbarMaxScroll / that.maxScrollX;
 234                 } else {
 235                         that.vScrollbarSize = that.vScrollbarWrapper.clientHeight;
 236                         that.vScrollbarIndicatorSize = m.max(m.round(that.vScrollbarSize * that.vScrollbarSize / that.scrollerH), 8);
 237                         that.vScrollbarIndicator.style.height = that.vScrollbarIndicatorSize + 'px';
 238                         that.vScrollbarMaxScroll = that.vScrollbarSize - that.vScrollbarIndicatorSize;
 239                         that.vScrollbarProp = that.vScrollbarMaxScroll / that.maxScrollY;
 240                 }
 241
 242                 // Reset position
 243                 that._scrollbarPos(dir, true);
 244         },
 245
 246         _resize: function () {
 247                 var that = this;
 248                 setTimeout(function () { that.refresh(); }, isAndroid ? 200 : 0);
 249         },
 250
 251         _pos: function (x, y) {
 252                 x = this.hScroll ? x : 0;
 253                 y = this.vScroll ? y : 0;
 254
 255                 if (this.options.useTransform) {
 256                         this.scroller.style[vendor + 'Transform'] = trnOpen + x + 'px,' + y + 'px' + trnClose + ' scale(' + this.scale + ')';
 257                 } else {
 258                         x = m.round(x);
 259                         y = m.round(y);
 260                         this.scroller.style.left = x + 'px';
 261                         this.scroller.style.top = y + 'px';
 262                 }
 263
 264                 this.x = x;
 265                 this.y = y;
 266
 267                 this._scrollbarPos('h');
 268                 this._scrollbarPos('v');
 269         },
 270
 271         _scrollbarPos: function (dir, hidden) {
 272                 var that = this,
 273                         pos = dir == 'h' ? that.x : that.y,
 274                         size;
 275
 276                 if (!that[dir + 'Scrollbar']) return;
 277
 278                 pos = that[dir + 'ScrollbarProp'] * pos;
 279
 280                 if (pos < 0) {
 281                         if (!that.options.fixedScrollbar) {
 282                                 size = that[dir + 'ScrollbarIndicatorSize'] + m.round(pos * 3);
 283                                 if (size < 8) size = 8;
 284                                 that[dir + 'ScrollbarIndicator'].style[dir == 'h' ? 'width' : 'height'] = size + 'px';
 285                         }
 286                         pos = 0;
 287                 } else if (pos > that[dir + 'ScrollbarMaxScroll']) {
 288                         if (!that.options.fixedScrollbar) {
 289                                 size = that[dir + 'ScrollbarIndicatorSize'] - m.round((pos - that[dir + 'ScrollbarMaxScroll']) * 3);
 290                                 if (size < 8) size = 8;
 291                                 that[dir + 'ScrollbarIndicator'].style[dir == 'h' ? 'width' : 'height'] = size + 'px';
 292                                 pos = that[dir + 'ScrollbarMaxScroll'] + (that[dir + 'ScrollbarIndicatorSize'] - size);
 293                         } else {
 294                                 pos = that[dir + 'ScrollbarMaxScroll'];
 295                         }
 296                 }
 297
 298                 that[dir + 'ScrollbarWrapper'].style[vendor + 'TransitionDelay'] = '0';
 299                 that[dir + 'ScrollbarWrapper'].style.opacity = hidden && that.options.hideScrollbar ? '0' : '1';
 300                 that[dir + 'ScrollbarIndicator'].style[vendor + 'Transform'] = trnOpen + (dir == 'h' ? pos + 'px,0' : '0,' + pos + 'px') + trnClose;
 301         },
 302
 303         _start: function (e) {
 304                 var that = this,
 305                         point = hasTouch ? e.touches[0] : e,
 306                         matrix, x, y,
 307                         c1, c2;
 308
 309                 if (!that.enabled) return;
 310
 311                 if (that.options.onBeforeScrollStart) that.options.onBeforeScrollStart.call(that, e);
 312
 313                 if (that.options.useTransition || that.options.zoom) that._transitionTime(0);
 314
 315                 that.moved = false;
 316                 that.animating = false;
 317                 that.zoomed = false;
 318                 that.distX = 0;
 319                 that.distY = 0;
 320                 that.absDistX = 0;
 321                 that.absDistY = 0;
 322                 that.dirX = 0;
 323                 that.dirY = 0;
 324
 325                 // Gesture start
 326                 if (that.options.zoom && hasTouch && e.touches.length > 1) {
 327                         c1 = m.abs(e.touches[0].pageX-e.touches[1].pageX);
 328                         c2 = m.abs(e.touches[0].pageY-e.touches[1].pageY);
 329                         that.touchesDistStart = m.sqrt(c1 * c1 + c2 * c2);
 330
 331                         that.originX = m.abs(e.touches[0].pageX + e.touches[1].pageX - that.wrapperOffsetLeft * 2) / 2 - that.x;
 332                         that.originY = m.abs(e.touches[0].pageY + e.touches[1].pageY - that.wrapperOffsetTop * 2) / 2 - that.y;
 333
 334                         if (that.options.onZoomStart) that.options.onZoomStart.call(that, e);
 335                 }
 336
 337                 if (that.options.momentum) {
 338                         if (that.options.useTransform) {
 339                                 // Very lame general purpose alternative to CSSMatrix
 340                                 matrix = getComputedStyle(that.scroller, null)[vendor + 'Transform'].replace(/[^0-9-.,]/g, '').split(',');
 341                                 x = matrix[4] * 1;
 342                                 y = matrix[5] * 1;
 343                         } else {
 344                                 x = getComputedStyle(that.scroller, null).left.replace(/[^0-9-]/g, '') * 1;
 345                                 y = getComputedStyle(that.scroller, null).top.replace(/[^0-9-]/g, '') * 1;
 346                         }
 347
 348                         if (x != that.x || y != that.y) {
 349                                 if (that.options.useTransition) that._unbind('webkitTransitionEnd');
 350                                 else cancelFrame(that.aniTime);
 351                                 that.steps = [];
 352                                 that._pos(x, y);
 353                         }
 354                 }
 355
 356                 that.absStartX = that.x;        // Needed by snap threshold
 357                 that.absStartY = that.y;
 358
 359                 that.startX = that.x;
 360                 that.startY = that.y;
 361                 that.pointX = point.pageX;
 362                 that.pointY = point.pageY;
 363
 364                 that.startTime = e.timeStamp || (new Date()).getTime();
 365
 366                 if (that.options.onScrollStart) that.options.onScrollStart.call(that, e);
 367
 368                 that._bind(MOVE_EV);
 369                 that._bind(END_EV);
 370                 that._bind(CANCEL_EV);
 371         },
 372
 373         _move: function (e) {
 374                 var that = this,
 375                         point = hasTouch ? e.touches[0] : e,
 376                         deltaX = point.pageX - that.pointX,
 377                         deltaY = point.pageY - that.pointY,
 378                         newX = that.x + deltaX,
 379                         newY = that.y + deltaY,
 380                         c1, c2, scale,
 381                         timestamp = e.timeStamp || (new Date()).getTime();
 382
 383                 if (that.options.onBeforeScrollMove) that.options.onBeforeScrollMove.call(that, e);
 384
 385                 // Zoom
 386                 if (that.options.zoom && hasTouch && e.touches.length > 1) {
 387                         c1 = m.abs(e.touches[0].pageX - e.touches[1].pageX);
 388                         c2 = m.abs(e.touches[0].pageY - e.touches[1].pageY);
 389                         that.touchesDist = m.sqrt(c1*c1+c2*c2);
 390
 391                         that.zoomed = true;
 392
 393                         scale = 1 / that.touchesDistStart * that.touchesDist * this.scale;
 394
 395                         if (scale < that.options.zoomMin) scale = 0.5 * that.options.zoomMin * Math.pow(2.0, scale / that.options.zoomMin);
 396                         else if (scale > that.options.zoomMax) scale = 2.0 * that.options.zoomMax * Math.pow(0.5, that.options.zoomMax / scale);
 397
 398                         that.lastScale = scale / this.scale;
 399
 400                         newX = this.originX - this.originX * that.lastScale + this.x,
 401                         newY = this.originY - this.originY * that.lastScale + this.y;
 402
 403                         this.scroller.style[vendor + 'Transform'] = trnOpen + newX + 'px,' + newY + 'px' + trnClose + ' scale(' + scale + ')';
 404
 405                         if (that.options.onZoom) that.options.onZoom.call(that, e);
 406                         return;
 407                 }
 408
 409                 that.pointX = point.pageX;
 410                 that.pointY = point.pageY;
 411
 412                 // Slow down if outside of the boundaries
 413                 if (newX > 0 || newX < that.maxScrollX) {
 414                         newX = that.options.bounce ? that.x + (deltaX / 2) : newX >= 0 || that.maxScrollX >= 0 ? 0 : that.maxScrollX;
 415                 }
 416                 if (newY > that.minScrollY || newY < that.maxScrollY) {
 417                         newY = that.options.bounce ? that.y + (deltaY / 2) : newY >= that.minScrollY || that.maxScrollY >= 0 ? that.minScrollY : that.maxScrollY;
 418                 }
 419
 420                 if (that.absDistX < 6 && that.absDistY < 6) {
 421                         that.distX += deltaX;
 422                         that.distY += deltaY;
 423                         that.absDistX = m.abs(that.distX);
 424                         that.absDistY = m.abs(that.distY);
 425
 426                         return;
 427                 }
 428
 429                 // Lock direction
 430                 if (that.options.lockDirection) {
 431                         if (that.absDistX > that.absDistY + 5) {
 432                                 newY = that.y;
 433                                 deltaY = 0;
 434                         } else if (that.absDistY > that.absDistX + 5) {
 435                                 newX = that.x;
 436                                 deltaX = 0;
 437                         }
 438                 }
 439
 440                 that.moved = true;
 441                 that._pos(newX, newY);
 442                 that.dirX = deltaX > 0 ? -1 : deltaX < 0 ? 1 : 0;
 443                 that.dirY = deltaY > 0 ? -1 : deltaY < 0 ? 1 : 0;
 444
 445                 if (timestamp - that.startTime > 300) {
 446                         that.startTime = timestamp;
 447                         that.startX = that.x;
 448                         that.startY = that.y;
 449                 }
 450
 451                 if (that.options.onScrollMove) that.options.onScrollMove.call(that, e);
 452         },
 453
 454         _end: function (e) {
 455                 if (hasTouch && e.touches.length != 0) return;
 456
 457                 var that = this,
 458                         point = hasTouch ? e.changedTouches[0] : e,
 459                         target, ev,
 460                         momentumX = { dist:0, time:0 },
 461                         momentumY = { dist:0, time:0 },
 462                         duration = (e.timeStamp || (new Date()).getTime()) - that.startTime,
 463                         newPosX = that.x,
 464                         newPosY = that.y,
 465                         distX, distY,
 466                         newDuration,
 467                         snap,
 468                         scale;
 469
 470                 that._unbind(MOVE_EV);
 471                 that._unbind(END_EV);
 472                 that._unbind(CANCEL_EV);
 473
 474                 if (that.options.onBeforeScrollEnd) that.options.onBeforeScrollEnd.call(that, e);
 475
 476                 if (that.zoomed) {
 477                         scale = that.scale * that.lastScale;
 478                         scale = Math.max(that.options.zoomMin, scale);
 479                         scale = Math.min(that.options.zoomMax, scale);
 480                         that.lastScale = scale / that.scale;
 481                         that.scale = scale;
 482
 483                         that.x = that.originX - that.originX * that.lastScale + that.x;
 484                         that.y = that.originY - that.originY * that.lastScale + that.y;
 485
 486                         that.scroller.style[vendor + 'TransitionDuration'] = '200ms';
 487                         that.scroller.style[vendor + 'Transform'] = trnOpen + that.x + 'px,' + that.y + 'px' + trnClose + ' scale(' + that.scale + ')';
 488
 489                         that.zoomed = false;
 490                         that.refresh();
 491
 492                         if (that.options.onZoomEnd) that.options.onZoomEnd.call(that, e);
 493                         return;
 494                 }
 495
 496                 if (!that.moved) {
 497                         if (hasTouch) {
 498                                 if (that.doubleTapTimer && that.options.zoom) {
 499                                         // Double tapped
 500                                         clearTimeout(that.doubleTapTimer);
 501                                         that.doubleTapTimer = null;
 502                                         if (that.options.onZoomStart) that.options.onZoomStart.call(that, e);
 503                                         that.zoom(that.pointX, that.pointY, that.scale == 1 ? that.options.doubleTapZoom : 1);
 504                                         if (that.options.onZoomEnd) {
 505                                                 setTimeout(function() {
 506                                                         that.options.onZoomEnd.call(that, e);
 507                                                 }, 200); // 200 is default zoom duration
 508                                         }
 509                                 } else {
 510                                         that.doubleTapTimer = setTimeout(function () {
 511                                                 that.doubleTapTimer = null;
 512
 513                                                 // Find the last touched element
 514                                                 target = point.target;
 515                                                 while (target.nodeType != 1) target = target.parentNode;
 516
 517                                                 if (target.tagName != 'SELECT' && target.tagName != 'INPUT' && target.tagName != 'TEXTAREA') {
 518                                                         ev = document.createEvent('MouseEvents');
 519                                                         ev.initMouseEvent('click', true, true, e.view, 1,
 520                                                                 point.screenX, point.screenY, point.clientX, point.clientY,
 521                                                                 e.ctrlKey, e.altKey, e.shiftKey, e.metaKey,
 522                                                                 0, null);
 523                                                         ev._fake = true;
 524                                                         target.dispatchEvent(ev);
 525                                                 }
 526                                         }, that.options.zoom ? 250 : 0);
 527                                 }
 528                         }
 529
 530                         that._resetPos(200);
 531
 532                         if (that.options.onTouchEnd) that.options.onTouchEnd.call(that, e);
 533                         return;
 534                 }
 535
 536                 if (duration < 300 && that.options.momentum) {
 537                         momentumX = newPosX ? that._momentum(newPosX - that.startX, duration, -that.x, that.scrollerW - that.wrapperW + that.x, that.options.bounce ? that.wrapperW : 0) : momentumX;
 538                         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;
 539
 540                         newPosX = that.x + momentumX.dist;
 541                         newPosY = that.y + momentumY.dist;
 542
 543                         if ((that.x > 0 && newPosX > 0) || (that.x < that.maxScrollX && newPosX < that.maxScrollX)) momentumX = { dist:0, time:0 };
 544                         if ((that.y > that.minScrollY && newPosY > that.minScrollY) || (that.y < that.maxScrollY && newPosY < that.maxScrollY)) momentumY = { dist:0, time:0 };
 545                 }
 546
 547                 if (momentumX.dist || momentumY.dist) {
 548                         newDuration = m.max(m.max(momentumX.time, momentumY.time), 10);
 549
 550                         // Do we need to snap?
 551                         if (that.options.snap) {
 552                                 distX = newPosX - that.absStartX;
 553                                 distY = newPosY - that.absStartY;
 554                                 if (m.abs(distX) < that.options.snapThreshold && m.abs(distY) < that.options.snapThreshold) { that.scrollTo(that.absStartX, that.absStartY, 200); }
 555                                 else {
 556                                         snap = that._snap(newPosX, newPosY);
 557                                         newPosX = snap.x;
 558                                         newPosY = snap.y;
 559                                         newDuration = m.max(snap.time, newDuration);
 560                                 }
 561                         }
 562
 563                         that.scrollTo(m.round(newPosX), m.round(newPosY), newDuration);
 564
 565                         if (that.options.onTouchEnd) that.options.onTouchEnd.call(that, e);
 566                         return;
 567                 }
 568
 569                 // Do we need to snap?
 570                 if (that.options.snap) {
 571                         distX = newPosX - that.absStartX;
 572                         distY = newPosY - that.absStartY;
 573                         if (m.abs(distX) < that.options.snapThreshold && m.abs(distY) < that.options.snapThreshold) that.scrollTo(that.absStartX, that.absStartY, 200);
 574                         else {
 575                                 snap = that._snap(that.x, that.y);
 576                                 if (snap.x != that.x || snap.y != that.y) that.scrollTo(snap.x, snap.y, snap.time);
 577                         }
 578
 579                         if (that.options.onTouchEnd) that.options.onTouchEnd.call(that, e);
 580                         return;
 581                 }
 582
 583                 that._resetPos(200);
 584                 if (that.options.onTouchEnd) that.options.onTouchEnd.call(that, e);
 585         },
 586
 587         _resetPos: function (time) {
 588                 var that = this,
 589                         resetX = that.x >= 0 ? 0 : that.x < that.maxScrollX ? that.maxScrollX : that.x,
 590                         resetY = that.y >= that.minScrollY || that.maxScrollY > 0 ? that.minScrollY : that.y < that.maxScrollY ? that.maxScrollY : that.y;
 591
 592                 if (resetX == that.x && resetY == that.y) {
 593                         if (that.moved) {
 594                                 that.moved = false;
 595                                 if (that.options.onScrollEnd) that.options.onScrollEnd.call(that);              // Execute custom code on scroll end
 596                         }
 597
 598                         if (that.hScrollbar && that.options.hideScrollbar) {
 599                                 if (vendor == 'webkit') that.hScrollbarWrapper.style[vendor + 'TransitionDelay'] = '300ms';
 600                                 that.hScrollbarWrapper.style.opacity = '0';
 601                         }
 602                         if (that.vScrollbar && that.options.hideScrollbar) {
 603                                 if (vendor == 'webkit') that.vScrollbarWrapper.style[vendor + 'TransitionDelay'] = '300ms';
 604                                 that.vScrollbarWrapper.style.opacity = '0';
 605                         }
 606
 607                         return;
 608                 }
 609
 610                 that.scrollTo(resetX, resetY, time || 0);
 611         },
 612
 613         _wheel: function (e) {
 614                 var that = this,
 615                         wheelDeltaX, wheelDeltaY,
 616                         deltaX, deltaY,
 617                         deltaScale;
 618
 619                 if ('wheelDeltaX' in e) {
 620                         wheelDeltaX = e.wheelDeltaX / 12;
 621                         wheelDeltaY = e.wheelDeltaY / 12;
 622                 } else if ('detail' in e) {
 623                         wheelDeltaX = wheelDeltaY = -e.detail * 3;
 624                 } else {
 625                         wheelDeltaX = wheelDeltaY = -e.wheelDelta;
 626                 }
 627
 628                 if (that.options.wheelAction == 'zoom') {
 629                         deltaScale = that.scale * Math.pow(2, 1/3 * (wheelDeltaY ? wheelDeltaY / Math.abs(wheelDeltaY) : 0));
 630                         if (deltaScale < that.options.zoomMin) deltaScale = that.options.zoomMin;
 631                         if (deltaScale > that.options.zoomMax) deltaScale = that.options.zoomMax;
 632
 633                         if (deltaScale != that.scale) {
 634                                 if (!that.wheelZoomCount && that.options.onZoomStart) that.options.onZoomStart.call(that, e);
 635                                 that.wheelZoomCount++;
 636
 637                                 that.zoom(e.pageX, e.pageY, deltaScale, 400);
 638
 639                                 setTimeout(function() {
 640                                         that.wheelZoomCount--;
 641                                         if (!that.wheelZoomCount && that.options.onZoomEnd) that.options.onZoomEnd.call(that, e);
 642                                 }, 400);
 643                         }
 644
 645                         return;
 646                 }
 647
 648                 deltaX = that.x + wheelDeltaX;
 649                 deltaY = that.y + wheelDeltaY;
 650
 651                 if (deltaX > 0) deltaX = 0;
 652                 else if (deltaX < that.maxScrollX) deltaX = that.maxScrollX;
 653
 654                 if (deltaY > that.minScrollY) deltaY = that.minScrollY;
 655                 else if (deltaY < that.maxScrollY) deltaY = that.maxScrollY;
 656
 657                 that.scrollTo(deltaX, deltaY, 0);
 658         },
 659
 660         _mouseout: function (e) {
 661                 var t = e.relatedTarget;
 662
 663                 if (!t) {
 664                         this._end(e);
 665                         return;
 666                 }
 667
 668                 while (t = t.parentNode) if (t == this.wrapper) return;
 669
 670                 this._end(e);
 671         },
 672
 673         _transitionEnd: function (e) {
 674                 var that = this;
 675
 676                 if (e.target != that.scroller) return;
 677
 678                 that._unbind('webkitTransitionEnd');
 679
 680                 that._startAni();
 681         },
 682
 683
 684         /**
 685          *
 686          * Utilities
 687          *
 688          */
 689         _startAni: function () {
 690                 var that = this,
 691                         startX = that.x, startY = that.y,
 692                         startTime = (new Date).getTime(),
 693                         step, easeOut;
 694
 695                 if (that.animating) return;
 696
 697                 if (!that.steps.length) {
 698                         that._resetPos(400);
 699                         return;
 700                 }
 701
 702                 step = that.steps.shift();
 703
 704                 if (step.x == startX && step.y == startY) step.time = 0;
 705
 706                 that.animating = true;
 707                 that.moved = true;
 708
 709                 if (that.options.useTransition) {
 710                         that._transitionTime(step.time);
 711                         that._pos(step.x, step.y);
 712                         that.animating = false;
 713                         if (step.time) that._bind('webkitTransitionEnd');
 714                         else that._resetPos(0);
 715                         return;
 716                 }
 717
 718                 (function animate () {
 719                         var now = (new Date).getTime(),
 720                                 newX, newY;
 721
 722                         if (now >= startTime + step.time) {
 723                                 that._pos(step.x, step.y);
 724                                 that.animating = false;
 725                                 if (that.options.onAnimationEnd) that.options.onAnimationEnd.call(that);                        // Execute custom code on animation end
 726                                 that._startAni();
 727                                 return;
 728                         }
 729
 730                         now = (now - startTime) / step.time - 1;
 731                         easeOut = m.sqrt(1 - now * now);
 732                         newX = (step.x - startX) * easeOut + startX;
 733                         newY = (step.y - startY) * easeOut + startY;
 734                         that._pos(newX, newY);
 735                         if (that.animating) that.aniTime = nextFrame(animate);
 736                 })();
 737         },
 738
 739         _transitionTime: function (time) {
 740                 time += 'ms';
 741                 this.scroller.style[vendor + 'TransitionDuration'] = time;
 742                 if (this.hScrollbar) this.hScrollbarIndicator.style[vendor + 'TransitionDuration'] = time;
 743                 if (this.vScrollbar) this.vScrollbarIndicator.style[vendor + 'TransitionDuration'] = time;
 744         },
 745
 746         _momentum: function (dist, time, maxDistUpper, maxDistLower, size) {
 747                 var deceleration = 0.0006,
 748                         speed = m.abs(dist) / time,
 749                         newDist = (speed * speed) / (2 * deceleration),
 750                         newTime = 0, outsideDist = 0;
 751
 752                 // Proportinally reduce speed if we are outside of the boundaries
 753                 if (dist > 0 && newDist > maxDistUpper) {
 754                         outsideDist = size / (6 / (newDist / speed * deceleration));
 755                         maxDistUpper = maxDistUpper + outsideDist;
 756                         speed = speed * maxDistUpper / newDist;
 757                         newDist = maxDistUpper;
 758                 } else if (dist < 0 && newDist > maxDistLower) {
 759                         outsideDist = size / (6 / (newDist / speed * deceleration));
 760                         maxDistLower = maxDistLower + outsideDist;
 761                         speed = speed * maxDistLower / newDist;
 762                         newDist = maxDistLower;
 763                 }
 764
 765                 newDist = newDist * (dist < 0 ? -1 : 1);
 766                 newTime = speed / deceleration;
 767
 768                 return { dist: newDist, time: m.round(newTime) };
 769         },
 770
 771         _offset: function (el) {
 772                 var left = -el.offsetLeft,
 773                         top = -el.offsetTop;
 774
 775                 while (el = el.offsetParent) {
 776                         left -= el.offsetLeft;
 777                         top -= el.offsetTop;
 778                 }
 779
 780                 if (el != this.wrapper) {
 781                         left *= this.scale;
 782                         top *= this.scale;
 783                 }
 784
 785                 return { left: left, top: top };
 786         },
 787
 788         _snap: function (x, y) {
 789                 var that = this,
 790                         i, l,
 791                         page, time,
 792                         sizeX, sizeY;
 793
 794                 // Check page X
 795                 page = that.pagesX.length - 1;
 796                 for (i=0, l=that.pagesX.length; i<l; i++) {
 797                         if (x >= that.pagesX[i]) {
 798                                 page = i;
 799                                 break;
 800                         }
 801                 }
 802                 if (page == that.currPageX && page > 0 && that.dirX < 0) page--;
 803                 x = that.pagesX[page];
 804                 sizeX = m.abs(x - that.pagesX[that.currPageX]);
 805                 sizeX = sizeX ? m.abs(that.x - x) / sizeX * 500 : 0;
 806                 that.currPageX = page;
 807
 808                 // Check page Y
 809                 page = that.pagesY.length-1;
 810                 for (i=0; i<page; i++) {
 811                         if (y >= that.pagesY[i]) {
 812                                 page = i;
 813                                 break;
 814                         }
 815                 }
 816                 if (page == that.currPageY && page > 0 && that.dirY < 0) page--;
 817                 y = that.pagesY[page];
 818                 sizeY = m.abs(y - that.pagesY[that.currPageY]);
 819                 sizeY = sizeY ? m.abs(that.y - y) / sizeY * 500 : 0;
 820                 that.currPageY = page;
 821
 822                 // Snap with constant speed (proportional duration)
 823                 time = m.round(m.max(sizeX, sizeY)) || 200;
 824
 825                 return { x: x, y: y, time: time };
 826         },
 827
 828         _bind: function (type, el, bubble) {
 829                 (el || this.scroller).addEventListener(type, this, !!bubble);
 830         },
 831
 832         _unbind: function (type, el, bubble) {
 833                 (el || this.scroller).removeEventListener(type, this, !!bubble);
 834         },
 835
 836
 837         /**
 838          *
 839          * Public methods
 840          *
 841          */
 842         destroy: function () {
 843                 var that = this;
 844
 845                 that.scroller.style[vendor + 'Transform'] = '';
 846
 847                 // Remove the scrollbars
 848                 that.hScrollbar = false;
 849                 that.vScrollbar = false;
 850                 that._scrollbar('h');
 851                 that._scrollbar('v');
 852
 853                 // Remove the event listeners
 854                 that._unbind(RESIZE_EV, window);
 855                 that._unbind(START_EV);
 856                 that._unbind(MOVE_EV);
 857                 that._unbind(END_EV);
 858                 that._unbind(CANCEL_EV);
 859
 860                 if (that.options.hasTouch) {
 861                         that._unbind('mouseout', that.wrapper);
 862                         that._unbind(WHEEL_EV);
 863                 }
 864
 865                 if (that.options.useTransition) that._unbind('webkitTransitionEnd');
 866
 867                 if (that.options.checkDOMChanges) clearInterval(that.checkDOMTime);
 868
 869                 if (that.options.onDestroy) that.options.onDestroy.call(that);
 870         },
 871
 872         refresh: function () {
 873                 var that = this,
 874                         offset,
 875                         i, l,
 876                         els,
 877                         pos = 0,
 878                         page = 0;
 879
 880                 if (that.scale < that.options.zoomMin) that.scale = that.options.zoomMin;
 881                 that.wrapperW = that.wrapper.clientWidth || 1;
 882                 that.wrapperH = that.wrapper.clientHeight || 1;
 883
 884                 that.minScrollY = -that.options.topOffset || 0;
 885                 that.scrollerW = m.round(that.scroller.offsetWidth * that.scale);
 886                 that.scrollerH = m.round((that.scroller.offsetHeight + that.minScrollY) * that.scale);
 887                 that.maxScrollX = that.wrapperW - that.scrollerW;
 888                 that.maxScrollY = that.wrapperH - that.scrollerH + that.minScrollY;
 889                 that.dirX = 0;
 890                 that.dirY = 0;
 891
 892                 if (that.options.onRefresh) that.options.onRefresh.call(that);
 893
 894                 that.hScroll = that.options.hScroll && that.maxScrollX < 0;
 895                 that.vScroll = that.options.vScroll && (!that.options.bounceLock && !that.hScroll || that.scrollerH > that.wrapperH);
 896
 897                 that.hScrollbar = that.hScroll && that.options.hScrollbar;
 898                 that.vScrollbar = that.vScroll && that.options.vScrollbar && that.scrollerH > that.wrapperH;
 899
 900                 offset = that._offset(that.wrapper);
 901                 that.wrapperOffsetLeft = -offset.left;
 902                 that.wrapperOffsetTop = -offset.top;
 903
 904                 // Prepare snap
 905                 if (typeof that.options.snap == 'string') {
 906                         that.pagesX = [];
 907                         that.pagesY = [];
 908                         els = that.scroller.querySelectorAll(that.options.snap);
 909                         for (i=0, l=els.length; i<l; i++) {
 910                                 pos = that._offset(els[i]);
 911                                 pos.left += that.wrapperOffsetLeft;
 912                                 pos.top += that.wrapperOffsetTop;
 913                                 that.pagesX[i] = pos.left < that.maxScrollX ? that.maxScrollX : pos.left * that.scale;
 914                                 that.pagesY[i] = pos.top < that.maxScrollY ? that.maxScrollY : pos.top * that.scale;
 915                         }
 916                 } else if (that.options.snap) {
 917                         that.pagesX = [];
 918                         while (pos >= that.maxScrollX) {
 919                                 that.pagesX[page] = pos;
 920                                 pos = pos - that.wrapperW;
 921                                 page++;
 922                         }
 923                         if (that.maxScrollX%that.wrapperW) that.pagesX[that.pagesX.length] = that.maxScrollX - that.pagesX[that.pagesX.length-1] + that.pagesX[that.pagesX.length-1];
 924
 925                         pos = 0;
 926                         page = 0;
 927                         that.pagesY = [];
 928                         while (pos >= that.maxScrollY) {
 929                                 that.pagesY[page] = pos;
 930                                 pos = pos - that.wrapperH;
 931                                 page++;
 932                         }
 933                         if (that.maxScrollY%that.wrapperH) that.pagesY[that.pagesY.length] = that.maxScrollY - that.pagesY[that.pagesY.length-1] + that.pagesY[that.pagesY.length-1];
 934                 }
 935
 936                 // Prepare the scrollbars
 937                 that._scrollbar('h');
 938                 that._scrollbar('v');
 939
 940                 if (!that.zoomed) {
 941                         that.scroller.style[vendor + 'TransitionDuration'] = '0';
 942                         that._resetPos(200);
 943                 }
 944         },
 945
 946         scrollTo: function (x, y, time, relative) {
 947                 var that = this,
 948                         step = x,
 949                         i, l;
 950
 951                 that.stop();
 952
 953                 if (!step.length) step = [{ x: x, y: y, time: time, relative: relative }];
 954
 955                 for (i=0, l=step.length; i<l; i++) {
 956                         if (step[i].relative) { step[i].x = that.x - step[i].x; step[i].y = that.y - step[i].y; }
 957                         that.steps.push({ x: step[i].x, y: step[i].y, time: step[i].time || 0 });
 958                 }
 959
 960                 that._startAni();
 961         },
 962
 963         scrollToElement: function (el, time) {
 964                 var that = this, pos;
 965                 el = el.nodeType ? el : that.scroller.querySelector(el);
 966                 if (!el) return;
 967
 968                 pos = that._offset(el);
 969                 pos.left += that.wrapperOffsetLeft;
 970                 pos.top += that.wrapperOffsetTop;
 971
 972                 pos.left = pos.left > 0 ? 0 : pos.left < that.maxScrollX ? that.maxScrollX : pos.left;
 973                 pos.top = pos.top > that.minScrollY ? that.minScrollY : pos.top < that.maxScrollY ? that.maxScrollY : pos.top;
 974                 time = time === undefined ? m.max(m.abs(pos.left)*2, m.abs(pos.top)*2) : time;
 975
 976                 that.scrollTo(pos.left, pos.top, time);
 977         },
 978
 979         scrollToPage: function (pageX, pageY, time) {
 980                 var that = this, x, y;
 981
 982                 if (that.options.snap) {
 983                         pageX = pageX == 'next' ? that.currPageX+1 : pageX == 'prev' ? that.currPageX-1 : pageX;
 984                         pageY = pageY == 'next' ? that.currPageY+1 : pageY == 'prev' ? that.currPageY-1 : pageY;
 985
 986                         pageX = pageX < 0 ? 0 : pageX > that.pagesX.length-1 ? that.pagesX.length-1 : pageX;
 987                         pageY = pageY < 0 ? 0 : pageY > that.pagesY.length-1 ? that.pagesY.length-1 : pageY;
 988
 989                         that.currPageX = pageX;
 990                         that.currPageY = pageY;
 991                         x = that.pagesX[pageX];
 992                         y = that.pagesY[pageY];
 993                 } else {
 994                         x = -that.wrapperW * pageX;
 995                         y = -that.wrapperH * pageY;
 996                         if (x < that.maxScrollX) x = that.maxScrollX;
 997                         if (y < that.maxScrollY) y = that.maxScrollY;
 998                 }
 999
1000                 that.scrollTo(x, y, time || 400);
1001         },
1002
1003         disable: function () {
1004                 this.stop();
1005                 this._resetPos(0);
1006                 this.enabled = false;
1007
1008                 // If disabled after touchstart we make sure that there are no left over events
1009                 this._unbind(MOVE_EV);
1010                 this._unbind(END_EV);
1011                 this._unbind(CANCEL_EV);
1012         },
1013
1014         enable: function () {
1015                 this.enabled = true;
1016         },
1017
1018         stop: function () {
1019                 if (this.options.useTransition) this._unbind('webkitTransitionEnd');
1020                 else cancelFrame(this.aniTime);
1021                 this.steps = [];
1022                 this.moved = false;
1023                 this.animating = false;
1024         },
1025
1026         zoom: function (x, y, scale, time) {
1027                 var that = this,
1028                         relScale = scale / that.scale;
1029
1030                 if (!that.options.useTransform) return;
1031
1032                 that.zoomed = true;
1033                 time = time === undefined ? 200 : time;
1034                 x = x - that.wrapperOffsetLeft - that.x;
1035                 y = y - that.wrapperOffsetTop - that.y;
1036                 that.x = x - x * relScale + that.x;
1037                 that.y = y - y * relScale + that.y;
1038
1039                 that.scale = scale;
1040                 that.refresh();
1041
1042                 that.x = that.x > 0 ? 0 : that.x < that.maxScrollX ? that.maxScrollX : that.x;
1043                 that.y = that.y > that.minScrollY ? that.minScrollY : that.y < that.maxScrollY ? that.maxScrollY : that.y;
1044
1045                 that.scroller.style[vendor + 'TransitionDuration'] = time + 'ms';
1046                 that.scroller.style[vendor + 'Transform'] = trnOpen + that.x + 'px,' + that.y + 'px' + trnClose + ' scale(' + scale + ')';
1047                 that.zoomed = false;
1048         },
1049
1050         isReady: function () {
1051                 return !this.moved && !this.zoomed && !this.animating;
1052         }
1053 };
1054
1055 //if (typeof exports !== 'undefined') exports.iScroll = iScroll;
1056 //else window.iScroll = iScroll;
1057
1058 })();