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