src/widgets/common/js/jquery.mobile.tizen.scrollview.js

   1 /*
   2 * jQuery Mobile Framework : scrollview plugin
   3 * Copyright (c) 2010 Adobe Systems Incorporated - Kin Blas (jblas@adobe.com)
   4 * Dual licensed under the MIT (MIT-LICENSE.txt) and GPL (GPL-LICENSE.txt) licenses.
   5 * Note: Code is in draft form and is subject to change
   6 * Modified by Koeun Choi <koeun.choi@samsung.com>
   7 * Modified by Minkyu Kang <mk7.kang@samsung.com>
   8 */
   9
  10 (function ( $, window, document, undefined ) {
  11
  12         function resizePageContentHeight( page ) {
  13                 var $page = $( page ),
  14                         $content = $page.children(".ui-content"),
  15                         hh = $page.children(".ui-header").outerHeight() || 0,
  16                         fh = $page.children(".ui-footer").outerHeight() || 0,
  17                         pt = parseFloat( $content.css("padding-top") ),
  18                         pb = parseFloat( $content.css("padding-bottom") ),
  19                         wh = $( window ).height();
  20
  21                 $content.height( wh - (hh + fh) - (pt + pb) );
  22         }
  23
  24         function MomentumTracker( options ) {
  25                 this.options = $.extend( {}, options );
  26                 this.easing = "easeOutQuad";
  27                 this.reset();
  28         }
  29
  30         var tstates = {
  31                 scrolling: 0,
  32                 overshot:  1,
  33                 snapback:  2,
  34                 done:      3
  35         };
  36
  37         function getCurrentTime() {
  38                 return Date.now();
  39         }
  40
  41         jQuery.widget( "tizen.scrollview", jQuery.mobile.widget, {
  42                 options: {
  43                         fps:               60,    // Frames per second in msecs.
  44                         direction:         null,  // "x", "y", or null for both.
  45
  46                         scrollDuration:    2000,  // Duration of the scrolling animation in msecs.
  47                         overshootDuration: 250,   // Duration of the overshoot animation in msecs.
  48                         snapbackDuration:  500,   // Duration of the snapback animation in msecs.
  49
  50                         moveThreshold:     30,   // User must move this many pixels in any direction to trigger a scroll.
  51                         moveIntervalThreshold:     150,   // Time between mousemoves must not exceed this threshold.
  52
  53                         scrollMethod:      "translate",  // "translate", "position"
  54                         startEventName:    "scrollstart",
  55                         updateEventName:   "scrollupdate",
  56                         stopEventName:     "scrollstop",
  57
  58                         eventType:         $.support.touch ? "touch" : "mouse",
  59
  60                         showScrollBars:    true,
  61                         overshootEnable:   false,
  62                         scrollJump:        false,
  63                 },
  64
  65                 _makePositioned: function ( $ele ) {
  66                         if ( $ele.css("position") === "static" ) {
  67                                 $ele.css( "position", "relative" );
  68                         }
  69                 },
  70
  71                 _create: function () {
  72                         var $page = $('.ui-page'),
  73                                 direction,
  74                                 self = this;
  75
  76                         this._$clip = $( this.element ).addClass("ui-scrollview-clip");
  77                         this._$view = this._$clip.wrapInner("<div></div>").children()
  78                                                         .addClass("ui-scrollview-view");
  79
  80                         if ( this.options.scrollMethod === "translate" ) {
  81                                 if ( this._$view.css("transform") === undefined ) {
  82                                         this.options.scrollMethod = "position";
  83                                 }
  84                         }
  85
  86                         this._$clip.css( "overflow", "hidden" );
  87                         this._makePositioned( this._$clip );
  88
  89                         this._makePositioned( this._$view );
  90                         this._$view.css( { left: 0, top: 0 } );
  91                         this._view_height = this._$view.height();
  92
  93                         this._sx = 0;
  94                         this._sy = 0;
  95
  96                         direction = this.options.direction;
  97
  98                         this._hTracker = ( direction !== "y" ) ?
  99                                         new MomentumTracker( this.options ) : null;
 100                         this._vTracker = ( direction !== "x" ) ?
 101                                         new MomentumTracker( this.options ) : null;
 102
 103                         this._timerInterval = 1000 / this.options.fps;
 104                         this._timerID = 0;
 105
 106                         this._timerCB = function () {
 107                                 self._handleMomentumScroll();
 108                         };
 109
 110                         this._add_event();
 111                         this._add_scrollbar();
 112                         this._add_scroll_jump();
 113                 },
 114
 115                 _startMScroll: function ( speedX, speedY ) {
 116                         var keepGoing = false,
 117                                 duration = this.options.scrollDuration,
 118                                 ht = this._hTracker,
 119                                 vt = this._vTracker,
 120                                 c,
 121                                 v;
 122
 123                         this._stopMScroll();
 124                         this._showScrollBars();
 125
 126                         this._$clip.trigger( this.options.startEventName );
 127
 128                         if ( ht ) {
 129                                 c = this._$clip.width();
 130                                 v = this._$view.width();
 131
 132                                 ht.start( this._sx, speedX,
 133                                         duration, (v > c) ? -(v - c) : 0, 0 );
 134                                 keepGoing = !ht.done();
 135                         }
 136
 137                         if ( vt ) {
 138                                 c = this._$clip.height();
 139                                 v = this._$view.height() +
 140                                         parseFloat( this._$view.css("padding-top") );
 141
 142                                 vt.start( this._sy, speedY,
 143                                         duration, (v > c) ? -(v - c) : 0, 0 );
 144                                 keepGoing = keepGoing || !vt.done();
 145                         }
 146
 147                         if ( keepGoing ) {
 148                                 this._timerID = setTimeout( this._timerCB, this._timerInterval );
 149                         } else {
 150                                 this._stopMScroll();
 151                         }
 152                 },
 153
 154                 _stopMScroll: function () {
 155                         if ( this._timerID ) {
 156                                 this._$clip.trigger( this.options.stopEventName );
 157                                 clearTimeout( this._timerID );
 158                         }
 159                         this._timerID = 0;
 160
 161                         if ( this._vTracker ) {
 162                                 this._vTracker.reset();
 163                         }
 164
 165                         if ( this._hTracker ) {
 166                                 this._hTracker.reset();
 167                         }
 168
 169                         this._hideScrollBars();
 170                 },
 171
 172                 _handleMomentumScroll: function () {
 173                         var keepGoing = false,
 174                                 x = 0,
 175                                 y = 0,
 176                                 vt = this._vTracker,
 177                                 ht = this._hTracker;
 178
 179                         if ( this._outerScrolling ) {
 180                                 return;
 181                         }
 182
 183                         if ( vt ) {
 184                                 vt.update( this.options.overshootEnable );
 185                                 y = vt.getPosition();
 186                                 keepGoing = !vt.done();
 187                         }
 188
 189                         if ( ht ) {
 190                                 ht.update( this.options.overshootEnable );
 191                                 x = ht.getPosition();
 192                                 keepGoing = keepGoing || !ht.done();
 193                         }
 194
 195                         this._setScrollPosition( x, y );
 196                         this._$clip.trigger( this.options.updateEventName,
 197                                         [ { x: x, y: y } ] );
 198
 199                         if ( keepGoing ) {
 200                                 this._timerID = setTimeout( this._timerCB, this._timerInterval );
 201                         } else {
 202                                 this._stopMScroll();
 203                         }
 204                 },
 205
 206                 _setElementTransform: function ( $ele, x, y, duration ) {
 207                         var translate,
 208                                 transition;
 209
 210                         if ( !duration || duration === undefined ) {
 211                                 transition = "none";
 212                         } else {
 213                                 transition =  "-webkit-transform " + duration / 1000 + "s";
 214                         }
 215
 216                         if ( $.support.cssTransform3d ) {
 217                                 translate = "translate3d(" + x + "," + y + ", 0px)";
 218                         } else {
 219                                 translate = "translate(" + x + "," + y + ")";
 220                         }
 221
 222                         $ele.css({
 223                                 "-moz-transform": translate,
 224                                 "-webkit-transform": translate,
 225                                 "-ms-transform": translate,
 226                                 "-o-transform": translate,
 227                                 "transform": translate,
 228                                 "-webkit-transition": transition
 229                         });
 230                 },
 231
 232                 _setCalibration: function ( x, y ) {
 233                         if ( this.options.overshootEnable ) {
 234                                 this._sx = x;
 235                                 this._sy = y;
 236                                 return;
 237                         }
 238
 239                         var $v = this._$view,
 240                                 $c = this._$clip,
 241                                 dirLock = this._directionLock,
 242                                 scroll_height = 0,
 243                                 scroll_width = 0;
 244
 245                         if ( dirLock !== "y" && this._hTracker ) {
 246                                 scroll_width = $v.width() - $c.width();
 247
 248                                 if ( x >= 0 ) {
 249                                         this._sx = 0;
 250                                 } else if ( x < -scroll_width ) {
 251                                         this._sx = -scroll_width;
 252                                 } else {
 253                                         this._sx = x;
 254                                 }
 255
 256                                 if ( scroll_width < 0 ) {
 257                                         this._sx = 0;
 258                                 }
 259                         }
 260
 261                         if ( dirLock !== "x" && this._vTracker ) {
 262                                 scroll_height = $v.height() - $c.height() +
 263                                         parseFloat( $c.css("padding-top") ) +
 264                                         parseFloat( $c.css("padding-bottom") );
 265
 266                                 this._outerScroll( y, scroll_height );
 267
 268                                 if ( y >= 0 ) {
 269                                         this._sy = 0;
 270                                 } else if ( y < -scroll_height ) {
 271                                         this._sy = -scroll_height;
 272                                 } else {
 273                                         this._sy = y;
 274                                 }
 275
 276                                 if ( scroll_height < 0 ) {
 277                                         this._sy = 0;
 278                                 }
 279                         }
 280                 },
 281
 282                 _setScrollPosition: function ( x, y, duration ) {
 283                         var $v = this._$view,
 284                                 sm = this.options.scrollMethod,
 285                                 $vsb = this._$vScrollBar,
 286                                 $hsb = this._$hScrollBar,
 287                                 $sbt;
 288
 289                         this._setCalibration( x, y );
 290
 291                         if ( this._outerScrolling ) {
 292                                 return;
 293                         }
 294
 295                         x = this._sx;
 296                         y = this._sy;
 297
 298                         if ( sm === "translate" ) {
 299                                 this._setElementTransform( $v, x + "px", y + "px", duration );
 300                         } else {
 301                                 $v.css( {left: x + "px", top: y + "px"} );
 302                         }
 303
 304                         if ( $vsb ) {
 305                                 $sbt = $vsb.find(".ui-scrollbar-thumb");
 306
 307                                 if ( sm === "translate" ) {
 308                                         this._setElementTransform( $sbt, "0px",
 309                                                 -y / $v.height() * $sbt.parent().height() + "px",
 310                                                 duration );
 311                                 } else {
 312                                         $sbt.css( "top", -y / $v.height() * 100 + "%" );
 313                                 }
 314                         }
 315
 316                         if ( $hsb ) {
 317                                 $sbt = $hsb.find(".ui-scrollbar-thumb");
 318
 319                                 if ( sm === "translate" ) {
 320                                         this._setElementTransform( $sbt,
 321                                                 -x / $v.width() * $sbt.parent().width() + "px", "0px",
 322                                                 duration);
 323                                 } else {
 324                                         $sbt.css("left", -x / $v.width() * 100 + "%");
 325                                 }
 326                         }
 327                 },
 328
 329                 _outerScroll: function ( y, scroll_height ) {
 330                         var self = this,
 331                                 top = $( window ).scrollTop(),
 332                                 sy = 0,
 333                                 duration = this.options.snapbackDuration,
 334                                 start = getCurrentTime(),
 335                                 tfunc;
 336
 337                         if ( this._$clip.jqmData("scroll") !== "y" ) {
 338                                 return;
 339                         }
 340
 341                         if ( this._outerScrolling ) {
 342                                 return;
 343                         }
 344
 345                         if ( !this._dragging ) {
 346                                 return;
 347                         }
 348
 349                         if ( scroll_height < 0 ) {
 350                                 return;
 351                         }
 352
 353                         if ( y > 0 ) {
 354                                 sy = -y;
 355                         } else if ( y < -scroll_height ) {
 356                                 sy = -y - scroll_height;
 357                         } else {
 358                                 return;
 359                         }
 360
 361                         sy *= 10;
 362
 363                         tfunc = function () {
 364                                 var elapsed = getCurrentTime() - start;
 365
 366                                 if ( elapsed >= duration ) {
 367                                         window.scrollTo( 0, top + sy );
 368                                         self._outerScrolling = undefined;
 369                                 } else {
 370                                         ec = $.easing.easeOutQuad( elapsed / duration, elapsed, 0, 1, duration );
 371
 372                                         window.scrollTo( 0, top + ( sy * ec ) );
 373                                         self._outerScrolling = setTimeout( tfunc, self._timerInterval );
 374                                 }
 375                         };
 376                         this._outerScrolling = setTimeout( tfunc, self._timerInterval );
 377
 378                         /* skip the srollview dragging */
 379                         this._skip_dragging = true;
 380                 },
 381
 382                 _scrollTo: function ( x, y, duration ) {
 383                         var self = this,
 384                                 start = getCurrentTime(),
 385                                 efunc = $.easing.easeOutQuad,
 386                                 sx = this._sx,
 387                                 sy = this._sy,
 388                                 dx = x - sx,
 389                                 dy = y - sy,
 390                                 tfunc;
 391
 392                         x = -x;
 393                         y = -y;
 394
 395                         tfunc = function () {
 396                                 var elapsed = getCurrentTime() - start,
 397                                     ec;
 398
 399                                 if ( elapsed >= duration ) {
 400                                         self._timerID = 0;
 401                                         self._setScrollPosition( x, y );
 402                                 } else {
 403                                         ec = efunc( elapsed / duration, elapsed, 0, 1, duration );
 404
 405                                         self._setScrollPosition( sx + ( dx * ec ), sy + ( dy * ec ) );
 406                                         self._timerID = setTimeout( tfunc, self._timerInterval );
 407                                 }
 408                         };
 409
 410                         this._timerID = setTimeout( tfunc, this._timerInterval );
 411                 },
 412
 413                 scrollTo: function ( x, y, duration ) {
 414                         this._stopMScroll();
 415
 416                         if ( !duration || this.options.scrollMethod === "translate" ) {
 417                                 this._setScrollPosition( x, y, duration );
 418                         } else {
 419                                 this._scrollTo( x, y, duration );
 420                         }
 421                 },
 422
 423                 getScrollPosition: function () {
 424                         return { x: -this._sx, y: -this._sy };
 425                 },
 426
 427                 _getScrollHierarchy: function () {
 428                         var svh = [],
 429                                 d;
 430
 431                         this._$clip.parents( ".ui-scrollview-clip").each( function () {
 432                                 d = $( this ).jqmData("scrollview");
 433                                 if ( d ) {
 434                                         svh.unshift( d );
 435                                 }
 436                         } );
 437                         return svh;
 438                 },
 439
 440                 _getAncestorByDirection: function ( dir ) {
 441                         var svh = this._getScrollHierarchy(),
 442                                 n = svh.length,
 443                                 sv,
 444                                 svdir;
 445
 446                         while ( 0 < n-- ) {
 447                                 sv = svh[n];
 448                                 svdir = sv.options.direction;
 449
 450                                 if (!svdir || svdir === dir) {
 451                                         return sv;
 452                                 }
 453                         }
 454                         return null;
 455                 },
 456
 457                 _handleDragStart: function ( e, ex, ey ) {
 458                         this._stopMScroll();
 459
 460                         this._didDrag = false;
 461                         this._skip_dragging = false;
 462
 463                         var target = $( e.target ),
 464                                 self = this,
 465                                 $c = this._$clip,
 466                                 svdir = this.options.direction;
 467
 468                         /* should prevent the default behavior when click the button */
 469                         this._is_button = target.is( '.ui-btn-text' ) ||
 470                                         target.is( '.ui-btn-inner' ) ||
 471                                         target.is( '.ui-btn-inner .ui-icon' );
 472
 473                         if ( this._is_button ) {
 474                                 if ( target.parents('.ui-slider-handle') ) {
 475                                         this._skip_dragging = true;
 476                                         return;
 477                                 }
 478                         }
 479
 480                         /*
 481                          * We need to prevent the default behavior to
 482                          * suppress accidental selection of text, etc.
 483                          */
 484                         this._is_inputbox = target.is(':input') ||
 485                                         target.parents(':input').length > 0;
 486
 487                         if ( this._is_inputbox ) {
 488                                 target.one( "resize.scrollview", function () {
 489                                         if ( ey > $c.height() ) {
 490                                                 self.scrollTo( -ex, self._sy - ey + $c.height(),
 491                                                         self.options.snapbackDuration );
 492                                         }
 493                                 });
 494                         }
 495
 496                         this._lastX = ex;
 497                         this._lastY = ey;
 498                         this._startY = ey;
 499                         this._doSnapBackX = false;
 500                         this._doSnapBackY = false;
 501                         this._speedX = 0;
 502                         this._speedY = 0;
 503                         this._directionLock = "";
 504
 505                         this._lastMove = 0;
 506                         this._enableTracking();
 507
 508                         this._set_scrollbar_size();
 509                 },
 510
 511                 _propagateDragMove: function ( sv, e, ex, ey, dir ) {
 512                         this._hideScrollBars();
 513                         this._disableTracking();
 514                         sv._handleDragStart( e, ex, ey );
 515                         sv._directionLock = dir;
 516                         sv._didDrag = this._didDrag;
 517                 },
 518
 519                 _handleDragMove: function ( e, ex, ey ) {
 520                         if ( this._skip_dragging ) {
 521                                 return;
 522                         }
 523
 524                         if ( !this._dragging ) {
 525                                 return;
 526                         }
 527
 528                         if ( !this._is_inputbox && !this._is_button ) {
 529                                 e.preventDefault();
 530                         }
 531
 532                         var mt = this.options.moveThreshold,
 533                                 dx = ex - this._lastX,
 534                                 dy = ey - this._lastY,
 535                                 svdir = this.options.direction,
 536                                 dir = null,
 537                                 x,
 538                                 y,
 539                                 sv,
 540                                 scope,
 541                                 newX,
 542                                 newY,
 543                                 dirLock;
 544
 545                         if ( Math.abs( this._startY - ey ) < mt && !this._didDrag ) {
 546                                 return;
 547                         }
 548
 549                         this._lastMove = getCurrentTime();
 550
 551                         if ( !this._directionLock ) {
 552                                 x = Math.abs( dx );
 553                                 y = Math.abs( dy );
 554
 555                                 if ( x < mt && y < mt ) {
 556                                         return false;
 557                                 }
 558
 559                                 if ( x < y && (x / y) < 0.5 ) {
 560                                         dir = "y";
 561                                 } else if ( x > y && (y / x) < 0.5 ) {
 562                                         dir = "x";
 563                                 }
 564
 565                                 if ( svdir && dir && svdir !== dir ) {
 566                                         /*
 567                                          * This scrollview can't handle the direction the user
 568                                          * is attempting to scroll. Find an ancestor scrollview
 569                                          * that can handle the request.
 570                                          */
 571
 572                                         sv = this._getAncestorByDirection( dir );
 573                                         if ( sv ) {
 574                                                 this._propagateDragMove( sv, e, ex, ey, dir );
 575                                                 return false;
 576                                         }
 577                                 }
 578
 579                                 this._directionLock = svdir || (dir || "none");
 580                         }
 581
 582                         newX = this._sx;
 583                         newY = this._sy;
 584                         dirLock = this._directionLock;
 585
 586                         if ( dirLock !== "y" && this._hTracker ) {
 587                                 x = this._sx;
 588                                 this._speedX = dx;
 589                                 newX = x + dx;
 590
 591                                 this._doSnapBackX = false;
 592
 593                                 scope = ( newX > 0 || newX < this._maxX );
 594
 595                                 if ( scope && dirLock === "x" ) {
 596                                         sv = this._getAncestorByDirection("x");
 597                                         if ( sv ) {
 598                                                 this._setScrollPosition( newX > 0 ?
 599                                                                 0 : this._maxX, newY );
 600                                                 this._propagateDragMove( sv, e, ex, ey, dir );
 601                                                 return false;
 602                                         }
 603
 604                                         newX = x + ( dx / 2 );
 605                                         this._doSnapBackX = true;
 606                                 }
 607                         }
 608
 609                         if ( dirLock !== "x" && this._vTracker ) {
 610                                 y = this._sy;
 611                                 this._speedY = dy;
 612                                 newY = y + dy;
 613
 614                                 this._doSnapBackY = false;
 615
 616                                 scope = ( newY > 0 || newY < this._maxY );
 617
 618                                 if ( scope && dirLock === "y" ) {
 619                                         sv = this._getAncestorByDirection("y");
 620                                         if ( sv ) {
 621                                                 this._setScrollPosition( newX,
 622                                                                 newY > 0 ? 0 : this._maxY );
 623                                                 this._propagateDragMove( sv, e, ex, ey, dir );
 624                                                 return false;
 625                                         }
 626
 627                                         newY = y + ( dy / 2 );
 628                                         this._doSnapBackY = true;
 629                                 }
 630                         }
 631
 632                         if ( this.options.overshootEnable === false ) {
 633                                 this._doSnapBackX = false;
 634                                 this._doSnapBackY = false;
 635                         }
 636
 637                         this._didDrag = true;
 638                         this._lastX = ex;
 639                         this._lastY = ey;
 640
 641                         this._setScrollPosition( newX, newY );
 642
 643                         this._showScrollBars();
 644                 },
 645
 646                 _handleDragStop: function ( e ) {
 647                         if ( this._skip_dragging ) {
 648                                 return;
 649                         }
 650
 651                         var l = this._lastMove,
 652                                 t = getCurrentTime(),
 653                                 doScroll = (l && (t - l) <= this.options.moveIntervalThreshold),
 654                                 sx = ( this._hTracker && this._speedX && doScroll ) ?
 655                                                 this._speedX : ( this._doSnapBackX ? 1 : 0 ),
 656                                 sy = ( this._vTracker && this._speedY && doScroll ) ?
 657                                                 this._speedY : ( this._doSnapBackY ? 1 : 0 ),
 658                                 svdir = this.options.direction,
 659                                 x,
 660                                 y;
 661
 662                         if ( sx || sy ) {
 663                                 this._startMScroll( sx, sy );
 664                         } else {
 665                                 this._hideScrollBars();
 666                         }
 667
 668                         this._disableTracking();
 669
 670                         return !this._didDrag;
 671                 },
 672
 673                 _enableTracking: function () {
 674                         this._dragging = true;
 675                 },
 676
 677                 _disableTracking: function () {
 678                         this._dragging = false;
 679                 },
 680
 681                 _showScrollBars: function () {
 682                         var vclass = "ui-scrollbar-visible";
 683
 684                         if ( !this.options.showScrollBars ) {
 685                                 return;
 686                         }
 687                         if ( this._scrollbar_showed ) {
 688                                 return;
 689                         }
 690
 691                         if ( this._$vScrollBar ) {
 692                                 this._$vScrollBar.addClass( vclass );
 693                         }
 694                         if ( this._$hScrollBar ) {
 695                                 this._$hScrollBar.addClass( vclass );
 696                         }
 697
 698                         this._scrollbar_showed = true;
 699                 },
 700
 701                 _hideScrollBars: function () {
 702                         var vclass = "ui-scrollbar-visible";
 703
 704                         if ( !this.options.showScrollBars ) {
 705                                 return;
 706                         }
 707                         if ( !this._scrollbar_showed ) {
 708                                 return;
 709                         }
 710
 711                         if ( this._$vScrollBar ) {
 712                                 this._$vScrollBar.removeClass( vclass );
 713                         }
 714                         if ( this._$hScrollBar ) {
 715                                 this._$hScrollBar.removeClass( vclass );
 716                         }
 717
 718                         this._scrollbar_showed = false;
 719                 },
 720
 721                 _add_event: function () {
 722                         var self = this,
 723                                 $c = this._$clip,
 724                                 $v = this._$view;
 725
 726                         if ( this.options.eventType === "mouse" ) {
 727                                 this._dragEvt = "mousedown mousemove mouseup click mousewheel";
 728
 729                                 this._dragCB = function ( e ) {
 730                                         switch ( e.type ) {
 731                                         case "mousedown":
 732                                                 return self._handleDragStart( e,
 733                                                                 e.clientX, e.clientY );
 734
 735                                         case "mousemove":
 736                                                 return self._handleDragMove( e,
 737                                                                 e.clientX, e.clientY );
 738
 739                                         case "mouseup":
 740                                                 return self._handleDragStop( e );
 741
 742                                         case "click":
 743                                                 return !self._didDrag;
 744
 745                                         case "mousewheel":
 746                                                 var old = self.getScrollPosition();
 747                                                 self.scrollTo( -old.x,
 748                                                         -(old.y - e.originalEvent.wheelDelta) );
 749                                                 break;
 750                                         }
 751                                 };
 752                         } else {
 753                                 this._dragEvt = "touchstart touchmove touchend click";
 754
 755                                 this._dragCB = function ( e ) {
 756                                         var t;
 757
 758                                         switch ( e.type ) {
 759                                         case "touchstart":
 760                                                 t = e.originalEvent.targetTouches[0];
 761                                                 return self._handleDragStart( e,
 762                                                                 t.pageX, t.pageY );
 763
 764                                         case "touchmove":
 765                                                 t = e.originalEvent.targetTouches[0];
 766                                                 return self._handleDragMove( e,
 767                                                                 t.pageX, t.pageY );
 768
 769                                         case "touchend":
 770                                                 return self._handleDragStop( e );
 771
 772                                         case "click":
 773                                                 return !self._didDrag;
 774                                         }
 775                                 };
 776                         }
 777
 778                         $v.bind( this._dragEvt, this._dragCB );
 779
 780                         if ( $c.jqmData("scroll") !== "y" ) {
 781                                 return;
 782                         }
 783
 784                         $c.bind( "updatelayout", function ( e ) {
 785                                 var $page = $c.parentsUntil("ui-page"),
 786                                         sy,
 787                                         vh;
 788
 789                                 if ( !$c.height() || !$v.height() ) {
 790                                         self.scrollTo( 0, 0, 0 );
 791                                         return;
 792                                 }
 793
 794                                 sy = $c.height() - $v.height();
 795                                 vh = $v.height() - self._view_height;
 796
 797                                 self._view_height = $v.height();
 798
 799                                 if ( vh == 0 || vh > $c.height() / 2 ) {
 800                                         return;
 801                                 }
 802
 803                                 if ( self._sy - sy <= -vh ) {
 804                                         self.scrollTo( 0, self._sy,
 805                                                 self.options.snapbackDuration );
 806                                 } else if ( self._sy - sy <= vh + self.options.moveThreshold ) {
 807                                         self.scrollTo( 0, sy,
 808                                                 self.options.snapbackDuration );
 809                                 }
 810                         });
 811
 812                         $( window ).bind( "resize", function ( e ) {
 813                                 var $page = $c.parentsUntil("ui-page"),
 814                                         focused;
 815
 816                                 if ( !$c.height() || !$v.height() ) {
 817                                         return;
 818                                 }
 819
 820                                 focused = $c.find(".ui-focus");
 821
 822                                 if ( focused ) {
 823                                         focused.trigger("resize.scrollview");
 824                                 }
 825
 826                                 /* calibration - after triggered throttledresize */
 827                                 setTimeout( function () {
 828                                         if ( self._sy < $c.height() - $v.height() ) {
 829                                                 self.scrollTo( 0, self._sy,
 830                                                         self.options.snapbackDuration );
 831                                         }
 832                                 }, 260 );
 833
 834                                 self._view_height = $v.height();
 835                         });
 836                 },
 837
 838                 _add_scrollbar: function () {
 839                         var $c = this._$clip,
 840                                 prefix = "<div class=\"ui-scrollbar ui-scrollbar-",
 841                                 suffix = "\"><div class=\"ui-scrollbar-track\"><div class=\"ui-scrollbar-thumb\"></div></div></div>";
 842
 843                         if ( !this.options.showScrollBars ) {
 844                                 return;
 845                         }
 846
 847                         if ( this._vTracker ) {
 848                                 $c.append( prefix + "y" + suffix );
 849                                 this._$vScrollBar = $c.children(".ui-scrollbar-y");
 850                         }
 851                         if ( this._hTracker ) {
 852                                 $c.append( prefix + "x" + suffix );
 853                                 this._$hScrollBar = $c.children(".ui-scrollbar-x");
 854                         }
 855
 856                         this._scrollbar_showed = false;
 857                 },
 858
 859                 _add_scroll_jump: function () {
 860                         var $c = this._$clip,
 861                                 self = this,
 862                                 top_btn,
 863                                 left_btn;
 864
 865                         if ( !this.options.scrollJump ) {
 866                                 return;
 867                         }
 868
 869                         if ( this._vTracker ) {
 870                                 top_btn = $( '<div class="ui-scroll-jump-top-bg ui-btn" data-theme="s">' +
 871                                                 '<div class="ui-scroll-jump-top"></div></div>' );
 872                                 $c.append( top_btn );
 873
 874                                 top_btn.bind( "vclick", function () {
 875                                         self.scrollTo( 0, 0, self.options.overshootDuration );
 876                                 } );
 877                         }
 878
 879                         if ( this._hTracker ) {
 880                                 left_btn = $( '<div class="ui-scroll-jump-left-bg ui-btn" data-theme="s">' +
 881                                                 '<div class="ui-scroll-jump-left"></div></div>' );
 882                                 $c.append( left_btn );
 883
 884                                 left_btn.bind( "vclick", function () {
 885                                         self.scrollTo( 0, 0, self.options.overshootDuration );
 886                                 } );
 887                         }
 888                 },
 889
 890                 _set_scrollbar_size: function () {
 891                         var $c = this._$clip,
 892                                 $v = this._$view,
 893                                 cw = 0,
 894                                 vw = 0,
 895                                 ch = 0,
 896                                 vh = 0,
 897                                 thumb;
 898
 899                         if ( !this.options.showScrollBars ) {
 900                                 return;
 901                         }
 902
 903                         if ( this._hTracker ) {
 904                                 cw = $c.width();
 905                                 vw = $v.width();
 906                                 this._maxX = cw - vw;
 907
 908                                 if ( this._maxX > 0 ) {
 909                                         this._maxX = 0;
 910                                 }
 911                                 if ( this._$hScrollBar && vw ) {
 912                                         thumb = this._$hScrollBar.find(".ui-scrollbar-thumb");
 913                                         thumb.css( "width", (cw >= vw ? "100%" :
 914                                                         (Math.floor(cw / vw * 100) || 1) + "%") );
 915                                 }
 916                         }
 917
 918                         if ( this._vTracker ) {
 919                                 ch = $c.height();
 920                                 vh = $v.height();
 921                                 this._maxY = ch - vh;
 922
 923                                 if ( this._maxY > 0 ) {
 924                                         this._maxY = 0;
 925                                 }
 926                                 if ( this._$vScrollBar && vh ) {
 927                                         thumb = this._$vScrollBar.find(".ui-scrollbar-thumb");
 928                                         thumb.css( "height", (ch >= vh ? "100%" :
 929                                                         (Math.floor(ch / vh * 100) || 1) + "%") );
 930                                 }
 931                         }
 932                 }
 933         });
 934
 935         $.extend( MomentumTracker.prototype, {
 936                 start: function ( pos, speed, duration, minPos, maxPos ) {
 937                         var tstate = ( pos < minPos || pos > maxPos ) ?
 938                                         tstates.snapback : tstates.scrolling,
 939                                 pos_temp;
 940
 941                         this.state = ( speed !== 0 ) ? tstate : tstates.done;
 942                         this.pos = pos;
 943                         this.speed = speed;
 944                         this.duration = ( this.state === tstates.snapback ) ?
 945                                         this.options.snapbackDuration : duration;
 946                         this.minPos = minPos;
 947                         this.maxPos = maxPos;
 948
 949                         this.fromPos = ( this.state === tstates.snapback ) ? this.pos : 0;
 950                         pos_temp = ( this.pos < this.minPos ) ? this.minPos : this.maxPos;
 951                         this.toPos = ( this.state === tstates.snapback ) ? pos_temp : 0;
 952
 953                         this.startTime = getCurrentTime();
 954                 },
 955
 956                 reset: function () {
 957                         this.state = tstates.done;
 958                         this.pos = 0;
 959                         this.speed = 0;
 960                         this.minPos = 0;
 961                         this.maxPos = 0;
 962                         this.duration = 0;
 963                 },
 964
 965                 update: function ( overshootEnable ) {
 966                         var state = this.state,
 967                                 cur_time = getCurrentTime(),
 968                                 duration = this.duration,
 969                                 elapsed =  cur_time - this.startTime,
 970                                 dx,
 971                                 x,
 972                                 didOverShoot;
 973
 974                         if ( state === tstates.done ) {
 975                                 return this.pos;
 976                         }
 977
 978                         elapsed = elapsed > duration ? duration : elapsed;
 979
 980                         if ( state === tstates.scrolling || state === tstates.overshot ) {
 981                                 dx = this.speed *
 982                                         ( 1 - $.easing[this.easing]( elapsed / duration,
 983                                                                 elapsed, 0, 1, duration ) );
 984
 985                                 x = this.pos + dx;
 986
 987                                 didOverShoot = ( state === tstates.scrolling ) &&
 988                                         ( x < this.minPos || x > this.maxPos );
 989
 990                                 if ( didOverShoot ) {
 991                                         x = ( x < this.minPos ) ? this.minPos : this.maxPos;
 992                                 }
 993
 994                                 this.pos = x;
 995
 996                                 if ( state === tstates.overshot ) {
 997                                         if ( elapsed >= duration ) {
 998                                                 this.state = tstates.snapback;
 999                                                 this.fromPos = this.pos;
1000                                                 this.toPos = ( x < this.minPos ) ?
1001                                                                 this.minPos : this.maxPos;
1002                                                 this.duration = this.options.snapbackDuration;
1003                                                 this.startTime = cur_time;
1004                                                 elapsed = 0;
1005                                         }
1006                                 } else if ( state === tstates.scrolling ) {
1007                                         if ( didOverShoot && overshootEnable ) {
1008                                                 this.state = tstates.overshot;
1009                                                 this.speed = dx / 2;
1010                                                 this.duration = this.options.overshootDuration;
1011                                                 this.startTime = cur_time;
1012                                         } else if ( elapsed >= duration ) {
1013                                                 this.state = tstates.done;
1014                                         }
1015                                 }
1016                         } else if ( state === tstates.snapback ) {
1017                                 if ( elapsed >= duration ) {
1018                                         this.pos = this.toPos;
1019                                         this.state = tstates.done;
1020                                 } else {
1021                                         this.pos = this.fromPos + (( this.toPos - this.fromPos ) *
1022                                                 $.easing[this.easing]( elapsed / duration,
1023                                                         elapsed, 0, 1, duration ));
1024                                 }
1025                         }
1026
1027                         return this.pos;
1028                 },
1029
1030                 done: function () {
1031                         return this.state === tstates.done;
1032                 },
1033
1034                 getPosition: function () {
1035                         return this.pos;
1036                 }
1037         });
1038
1039         $( document ).bind( 'pagecreate create', function ( e ) {
1040                 var $page = $( e.target ),
1041                         content_scroll = $page.find(".ui-content").jqmData("scroll");
1042
1043                 /* content scroll */
1044                 if ( $.support.scrollview === undefined ) {
1045                         $.support.scrollview = true;
1046                 }
1047
1048                 if ( $.support.scrollview === true && content_scroll === undefined ) {
1049                         content_scroll = "y";
1050                 }
1051
1052                 if ( content_scroll !== "y" ) {
1053                         content_scroll = "none";
1054                 }
1055
1056                 $page.find(".ui-content").attr( "data-scroll", content_scroll );
1057
1058                 $page.find(":jqmData(scroll):not(.ui-scrollview-clip)").each( function () {
1059                         if ( $( this ).hasClass("ui-scrolllistview") ) {
1060                                 $( this ).scrolllistview();
1061                         } else {
1062                                 var st = $( this ).jqmData("scroll"),
1063                                         dir = st && ( st.search(/^[xy]/) !== -1 ) ? st.charAt(0) : null,
1064                                         opts;
1065
1066                                 if ( st === "none" ) {
1067                                         return;
1068                                 }
1069
1070                                 opts = {
1071                                         direction: dir || undefined,
1072                                         scrollMethod: $( this ).jqmData("scroll-method") || undefined,
1073                                         scrollJump: $( this ).jqmData("scroll-jump") || undefined
1074                                 };
1075
1076                                 $( this ).scrollview( opts );
1077                         }
1078                 });
1079         });
1080
1081         $( document ).bind( 'pageshow', function ( e ) {
1082                 var $page = $( e.target ),
1083                         scroll = $page.find(".ui-content").jqmData("scroll");
1084
1085                 if ( scroll === "y" ) {
1086                         resizePageContentHeight( e.target );
1087                 }
1088         });
1089
1090 }( jQuery, window, document ) );