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