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