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