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   1  /*

   2   * jQuery UI Draggable 1.6

   3   *

   4   * Copyright (c) 2008 AUTHORS.txt (http://ui.jquery.com/about)

   5   * Dual licensed under the MIT (MIT-LICENSE.txt)

   6   * and GPL (GPL-LICENSE.txt) licenses.

   7   *

   8   * http://docs.jquery.com/UI/Draggables

   9   *

  10   * Depends:

  11   *    ui.core.js

  12   */
  13  (function($) {
  14  
  15  $.widget("ui.draggable", $.extend({}, $.ui.mouse, {
  16  
  17      _init: function() {
  18  
  19          if (this.options.helper == 'original' && !(/^(?:r|a|f)/).test(this.element.css("position")))
  20              this.element[0].style.position = 'relative';
  21  
  22          (this.options.cssNamespace && this.element.addClass(this.options.cssNamespace+"-draggable"));
  23          (this.options.disabled && this.element.addClass('ui-draggable-disabled'));
  24  
  25          this._mouseInit();
  26  
  27      },
  28  
  29      destroy: function() {
  30          if(!this.element.data('draggable')) return;
  31          this.element.removeData("draggable").unbind(".draggable").removeClass('ui-draggable ui-draggable-dragging ui-draggable-disabled');
  32          this._mouseDestroy();
  33      },
  34  
  35      _mouseCapture: function(event) {
  36  
  37          var o = this.options;
  38  
  39          if (this.helper || o.disabled || $(event.target).is('.ui-resizable-handle'))
  40              return false;
  41  
  42          //Quit if we're not on a valid handle

  43          this.handle = this._getHandle(event);
  44          if (!this.handle)
  45              return false;
  46  
  47          return true;
  48  
  49      },
  50  
  51      _mouseStart: function(event) {
  52  
  53          var o = this.options;
  54  
  55          //Create and append the visible helper

  56          this.helper = this._createHelper(event);
  57  
  58          //Cache the helper size

  59          this._cacheHelperProportions();
  60  
  61          //If ddmanager is used for droppables, set the global draggable

  62          if($.ui.ddmanager)
  63              $.ui.ddmanager.current = this;
  64  
  65          /*

  66           * - Position generation -

  67           * This block generates everything position related - it's the core of draggables.

  68           */
  69  
  70          //Cache the margins of the original element

  71          this._cacheMargins();
  72  
  73          //Store the helper's css position

  74          this.cssPosition = this.helper.css("position");
  75          this.scrollParent = this.helper.scrollParent();
  76  
  77          //The element's absolute position on the page minus margins

  78          this.offset = this.element.offset();
  79          this.offset = {
  80              top: this.offset.top - this.margins.top,
  81              left: this.offset.left - this.margins.left
  82          };
  83  
  84          $.extend(this.offset, {
  85              click: { //Where the click happened, relative to the element
  86                  left: event.pageX - this.offset.left,
  87                  top: event.pageY - this.offset.top
  88              },
  89              parent: this._getParentOffset(),
  90              relative: this._getRelativeOffset() //This is a relative to absolute position minus the actual position calculation - only used for relative positioned helper
  91          });
  92  
  93          //Adjust the mouse offset relative to the helper if 'cursorAt' is supplied

  94          if(o.cursorAt)
  95              this._adjustOffsetFromHelper(o.cursorAt);
  96  
  97          //Generate the original position

  98          this.originalPosition = this._generatePosition(event);
  99  
 100          //Set a containment if given in the options

 101          if(o.containment)
 102              this._setContainment();
 103  
 104          //Call plugins and callbacks

 105          this._propagate("start", event);
 106  
 107          //Recache the helper size

 108          this._cacheHelperProportions();
 109  
 110          //Prepare the droppable offsets

 111          if ($.ui.ddmanager && !o.dropBehaviour)
 112              $.ui.ddmanager.prepareOffsets(this, event);
 113  
 114          this.helper.addClass("ui-draggable-dragging");
 115          this._mouseDrag(event, true); //Execute the drag once - this causes the helper not to be visible before getting its correct position

 116          return true;
 117      },
 118  
 119      _mouseDrag: function(event, noPropagation) {
 120  
 121          //Compute the helpers position

 122          this.position = this._generatePosition(event);
 123          this.positionAbs = this._convertPositionTo("absolute");
 124  
 125          //Call plugins and callbacks and use the resulting position if something is returned

 126          if(!noPropagation) this.position = this._propagate("drag", event) || this.position;
 127  
 128          if(!this.options.axis || this.options.axis != "y") this.helper[0].style.left = this.position.left+'px';
 129          if(!this.options.axis || this.options.axis != "x") this.helper[0].style.top = this.position.top+'px';
 130          if($.ui.ddmanager) $.ui.ddmanager.drag(this, event);
 131  
 132          return false;
 133      },
 134  
 135      _mouseStop: function(event) {
 136  
 137          //If we are using droppables, inform the manager about the drop

 138          var dropped = false;
 139          if ($.ui.ddmanager && !this.options.dropBehaviour)
 140              var dropped = $.ui.ddmanager.drop(this, event);
 141  
 142          if((this.options.revert == "invalid" && !dropped) || (this.options.revert == "valid" && dropped) || this.options.revert === true || ($.isFunction(this.options.revert) && this.options.revert.call(this.element, dropped))) {
 143              var self = this;
 144              $(this.helper).animate(this.originalPosition, parseInt(this.options.revertDuration, 10), function() {
 145                  self._propagate("stop", event);
 146                  self._clear();
 147              });
 148          } else {
 149              this._propagate("stop", event);
 150              this._clear();
 151          }
 152  
 153          return false;
 154      },
 155  
 156      _getHandle: function(event) {
 157  
 158          var handle = !this.options.handle || !$(this.options.handle, this.element).length ? true : false;
 159          $(this.options.handle, this.element)
 160              .find("*")
 161              .andSelf()
 162              .each(function() {
 163                  if(this == event.target) handle = true;
 164              });
 165  
 166          return handle;
 167  
 168      },
 169  
 170      _createHelper: function(event) {
 171  
 172          var o = this.options;
 173          var helper = $.isFunction(o.helper) ? $(o.helper.apply(this.element[0], [event])) : (o.helper == 'clone' ? this.element.clone() : this.element);
 174  
 175          if(!helper.parents('body').length)
 176              helper.appendTo((o.appendTo == 'parent' ? this.element[0].parentNode : o.appendTo));
 177  
 178          if(helper[0] != this.element[0] && !(/(fixed|absolute)/).test(helper.css("position")))
 179              helper.css("position", "absolute");
 180  
 181          return helper;
 182  
 183      },
 184  
 185      _adjustOffsetFromHelper: function(obj) {
 186          if(obj.left != undefined) this.offset.click.left = obj.left + this.margins.left;
 187          if(obj.right != undefined) this.offset.click.left = this.helperProportions.width - obj.right + this.margins.left;
 188          if(obj.top != undefined) this.offset.click.top = obj.top + this.margins.top;
 189          if(obj.bottom != undefined) this.offset.click.top = this.helperProportions.height - obj.bottom + this.margins.top;
 190      },
 191  
 192      _getParentOffset: function() {
 193  
 194          this.offsetParent = this.helper.offsetParent(); var po = this.offsetParent.offset();            //Get the offsetParent and cache its position

 195  
 196          if((this.offsetParent[0] == document.body && $.browser.mozilla)    //Ugly FF3 fix
 197          || (this.offsetParent[0].tagName && this.offsetParent[0].tagName.toLowerCase() == 'html' && $.browser.msie)) //Ugly IE fix
 198              po = { top: 0, left: 0 };
 199  
 200          return {
 201              top: po.top + (parseInt(this.offsetParent.css("borderTopWidth"),10) || 0),
 202              left: po.left + (parseInt(this.offsetParent.css("borderLeftWidth"),10) || 0)
 203          };
 204  
 205      },
 206  
 207      _getRelativeOffset: function() {
 208  
 209          if(this.cssPosition == "relative") {
 210              var p = this.element.position();
 211              return {
 212                  top: p.top - (parseInt(this.helper.css("top"),10) || 0) + this.scrollParent.scrollTop(),
 213                  left: p.left - (parseInt(this.helper.css("left"),10) || 0) + this.scrollParent.scrollLeft()
 214              };
 215          } else {
 216              return { top: 0, left: 0 };
 217          }
 218  
 219      },
 220  
 221      _cacheMargins: function() {
 222          this.margins = {
 223              left: (parseInt(this.element.css("marginLeft"),10) || 0),
 224              top: (parseInt(this.element.css("marginTop"),10) || 0)
 225          };
 226      },
 227  
 228      _cacheHelperProportions: function() {
 229          this.helperProportions = {
 230              width: this.helper.outerWidth(),
 231              height: this.helper.outerHeight()
 232          };
 233      },
 234  
 235      _setContainment: function() {
 236  
 237          var o = this.options;
 238          if(o.containment == 'parent') o.containment = this.helper[0].parentNode;
 239          if(o.containment == 'document' || o.containment == 'window') this.containment = [
 240              0 - this.offset.relative.left - this.offset.parent.left,
 241              0 - this.offset.relative.top - this.offset.parent.top,
 242              $(o.containment == 'document' ? document : window).width() - this.offset.relative.left - this.offset.parent.left - this.helperProportions.width - this.margins.left - (parseInt(this.element.css("marginRight"),10) || 0),
 243              ($(o.containment == 'document' ? document : window).height() || document.body.parentNode.scrollHeight) - this.offset.relative.top - this.offset.parent.top - this.helperProportions.height - this.margins.top - (parseInt(this.element.css("marginBottom"),10) || 0)
 244          ];
 245  
 246          if(!(/^(document|window|parent)$/).test(o.containment)) {
 247              var ce = $(o.containment)[0];
 248              var co = $(o.containment).offset();
 249              var over = ($(ce).css("overflow") != 'hidden');
 250  
 251              this.containment = [
 252                  co.left + (parseInt($(ce).css("borderLeftWidth"),10) || 0) - this.offset.relative.left - this.offset.parent.left - this.margins.left,
 253                  co.top + (parseInt($(ce).css("borderTopWidth"),10) || 0) - this.offset.relative.top - this.offset.parent.top - this.margins.top,
 254                  co.left+(over ? Math.max(ce.scrollWidth,ce.offsetWidth) : ce.offsetWidth) - (parseInt($(ce).css("borderLeftWidth"),10) || 0) - this.offset.relative.left - this.offset.parent.left - this.helperProportions.width - this.margins.left,
 255                  co.top+(over ? Math.max(ce.scrollHeight,ce.offsetHeight) : ce.offsetHeight) - (parseInt($(ce).css("borderTopWidth"),10) || 0) - this.offset.relative.top - this.offset.parent.top - this.helperProportions.height - this.margins.top
 256              ];
 257          }
 258  
 259      },
 260  
 261      _convertPositionTo: function(d, pos) {
 262  
 263          if(!pos) pos = this.position;
 264          var mod = d == "absolute" ? 1 : -1;
 265          var scroll = this[(this.cssPosition == 'absolute' ? 'offset' : 'scroll')+'Parent'], scrollIsRootNode = (/(html|body)/i).test(scroll[0].tagName);
 266  
 267          return {
 268              top: (
 269                  pos.top                                                                    // the calculated relative position
 270                  + this.offset.relative.top    * mod                                        // Only for relative positioned nodes: Relative offset from element to offset parent
 271                  + this.offset.parent.top * mod                                            // The offsetParent's offset without borders (offset + border)
 272                  + ( this.cssPosition == 'fixed' ? -this.scrollParent.scrollTop() : ( scrollIsRootNode ? 0 : scroll.scrollTop() ) ) * mod
 273                  + this.margins.top * mod                                                //Add the margin (you don't want the margin counting in intersection methods)
 274              ),
 275              left: (
 276                  pos.left                                                                // the calculated relative position
 277                  + this.offset.relative.left    * mod                                        // Only for relative positioned nodes: Relative offset from element to offset parent
 278                  + this.offset.parent.left * mod                                            // The offsetParent's offset without borders (offset + border)
 279                  + ( this.cssPosition == 'fixed' ? -this.scrollParent.scrollLeft() : ( scrollIsRootNode ? 0 : scroll.scrollLeft() ) ) * mod
 280                  + this.margins.left * mod                                                //Add the margin (you don't want the margin counting in intersection methods)
 281              )
 282          };
 283      },
 284  
 285      _generatePosition: function(event) {
 286  
 287          var o = this.options, scroll = this[(this.cssPosition == 'absolute' ? 'offset' : 'scroll')+'Parent'], scrollIsRootNode = (/(html|body)/i).test(scroll[0].tagName);
 288  
 289          var position = {
 290              top: (
 291                  event.pageY                                                                // The absolute mouse position
 292                  - this.offset.click.top                                                    // Click offset (relative to the element)
 293                  - this.offset.relative.top                                                // Only for relative positioned nodes: Relative offset from element to offset parent
 294                  - this.offset.parent.top                                                // The offsetParent's offset without borders (offset + border)
 295                  + ( this.cssPosition == 'fixed' ? -this.scrollParent.scrollTop() : ( scrollIsRootNode ? 0 : scroll.scrollTop() ) )
 296              ),
 297              left: (
 298                  event.pageX                                                                // The absolute mouse position
 299                  - this.offset.click.left                                                // Click offset (relative to the element)
 300                  - this.offset.relative.left                                                // Only for relative positioned nodes: Relative offset from element to offset parent
 301                  - this.offset.parent.left                                                // The offsetParent's offset without borders (offset + border)
 302                  + ( this.cssPosition == 'fixed' ? -this.scrollParent.scrollLeft() : scrollIsRootNode ? 0 : scroll.scrollLeft() )
 303              )
 304          };
 305  
 306          if(!this.originalPosition) return position;                                        //If we are not dragging yet, we won't check for options

 307  
 308          /*

 309           * - Position constraining -

 310           * Constrain the position to a mix of grid, containment.

 311           */
 312          if(this.containment) {
 313              if(position.left < this.containment[0]) position.left = this.containment[0];
 314              if(position.top < this.containment[1]) position.top = this.containment[1];
 315              if(position.left > this.containment[2]) position.left = this.containment[2];
 316              if(position.top > this.containment[3]) position.top = this.containment[3];
 317          }
 318  
 319          if(o.grid) {
 320              var top = this.originalPosition.top + Math.round((position.top - this.originalPosition.top) / o.grid[1]) * o.grid[1];
 321              position.top = this.containment ? (!(top < this.containment[1] || top > this.containment[3]) ? top : (!(top < this.containment[1]) ? top - o.grid[1] : top + o.grid[1])) : top;
 322  
 323              var left = this.originalPosition.left + Math.round((position.left - this.originalPosition.left) / o.grid[0]) * o.grid[0];
 324              position.left = this.containment ? (!(left < this.containment[0] || left > this.containment[2]) ? left : (!(left < this.containment[0]) ? left - o.grid[0] : left + o.grid[0])) : left;
 325          }
 326  
 327          return position;
 328      },
 329  
 330      _clear: function() {
 331          this.helper.removeClass("ui-draggable-dragging");
 332          if(this.helper[0] != this.element[0] && !this.cancelHelperRemoval) this.helper.remove();
 333          //if($.ui.ddmanager) $.ui.ddmanager.current = null;

 334          this.helper = null;
 335          this.cancelHelperRemoval = false;
 336      },
 337  
 338      // From now on bulk stuff - mainly helpers

 339  
 340      _propagate: function(n, event) {
 341          $.ui.plugin.call(this, n, [event, this._uiHash()]);
 342          if(n == "drag") this.positionAbs = this._convertPositionTo("absolute"); //The absolute position has to be recalculated after plugins

 343          return this.element.triggerHandler(n == "drag" ? n : "drag"+n, [event, this._uiHash()], this.options[n]);
 344      },
 345  
 346      plugins: {},
 347  
 348      _uiHash: function(event) {
 349          return {
 350              helper: this.helper,
 351              position: this.position,
 352              absolutePosition: this.positionAbs,
 353              options: this.options
 354          };
 355      }
 356  
 357  }));
 358  
 359  $.extend($.ui.draggable, {
 360      version: "1.6",
 361      defaults: {
 362          appendTo: "parent",
 363          axis: false,
 364          cancel: ":input",
 365          connectToSortable: false,
 366          containment: false,
 367          cssNamespace: "ui",
 368          cursor: "default",
 369          cursorAt: null,
 370          delay: 0,
 371          distance: 1,
 372          grid: false,
 373          handle: false,
 374          helper: "original",
 375          iframeFix: false,
 376          opacity: 1,
 377          refreshPositions: false,
 378          revert: false,
 379          revertDuration: 500,
 380          scope: "default",
 381          scroll: true,
 382          scrollSensitivity: 20,
 383          scrollSpeed: 20,
 384          snap: false,
 385          snapMode: "both",
 386          snapTolerance: 20,
 387          stack: false,
 388          zIndex: null
 389      }
 390  });
 391  
 392  $.ui.plugin.add("draggable", "connectToSortable", {
 393      start: function(event, ui) {
 394  
 395          var inst = $(this).data("draggable");
 396          inst.sortables = [];
 397          $(ui.options.connectToSortable).each(function() {
 398              // 'this' points to a string, and should therefore resolved as query, but instead, if the string is assigned to a variable, it loops through the strings properties,

 399              // so we have to append '' to make it anonymous again

 400              $(this+'').each(function() {
 401                  if($.data(this, 'sortable')) {
 402                      var sortable = $.data(this, 'sortable');
 403                      inst.sortables.push({
 404                          instance: sortable,
 405                          shouldRevert: sortable.options.revert
 406                      });
 407                      sortable._refreshItems();    //Do a one-time refresh at start to refresh the containerCache

 408                      sortable._propagate("activate", event, inst);
 409                  }
 410              });
 411          });
 412  
 413      },
 414      stop: function(event, ui) {
 415  
 416          //If we are still over the sortable, we fake the stop event of the sortable, but also remove helper

 417          var inst = $(this).data("draggable");
 418  
 419          $.each(inst.sortables, function() {
 420              if(this.instance.isOver) {
 421                  this.instance.isOver = 0;
 422                  inst.cancelHelperRemoval = true; //Don't remove the helper in the draggable instance

 423                  this.instance.cancelHelperRemoval = false; //Remove it in the sortable instance (so sortable plugins like revert still work)

 424                  if(this.shouldRevert) this.instance.options.revert = true; //revert here

 425                  this.instance._mouseStop(event);
 426  
 427                  //Also propagate receive event, since the sortable is actually receiving a element

 428                  this.instance.element.triggerHandler("sortreceive", [event, $.extend(this.instance._ui(), { sender: inst.element })], this.instance.options["receive"]);
 429  
 430                  this.instance.options.helper = this.instance.options._helper;
 431                  
 432                  if(inst.options.helper == 'original') {
 433                      this.instance.currentItem.css({ top: 'auto', left: 'auto' });
 434                  }
 435  
 436              } else {
 437                  this.instance.cancelHelperRemoval = false; //Remove the helper in the sortable instance

 438                  this.instance._propagate("deactivate", event, inst);
 439              }
 440  
 441          });
 442  
 443      },
 444      drag: function(event, ui) {
 445  
 446          var inst = $(this).data("draggable"), self = this;
 447  
 448          var checkPos = function(o) {
 449              var dyClick = this.offset.click.top, dxClick = this.offset.click.left;
 450              var helperTop = this.positionAbs.top, helperLeft = this.positionAbs.left;
 451              var itemHeight = o.height, itemWidth = o.width;
 452              var itemTop = o.top, itemLeft = o.left;
 453  
 454              return $.ui.isOver(helperTop + dyClick, helperLeft + dxClick, itemTop, itemLeft, itemHeight, itemWidth);
 455          };
 456  
 457          $.each(inst.sortables, function(i) {
 458  
 459              if(checkPos.call(inst, this.instance.containerCache)) {
 460  
 461                  //If it intersects, we use a little isOver variable and set it once, so our move-in stuff gets fired only once

 462                  if(!this.instance.isOver) {
 463                      this.instance.isOver = 1;
 464                      //Now we fake the start of dragging for the sortable instance,

 465                      //by cloning the list group item, appending it to the sortable and using it as inst.currentItem

 466                      //We can then fire the start event of the sortable with our passed browser event, and our own helper (so it doesn't create a new one)

 467                      this.instance.currentItem = $(self).clone().appendTo(this.instance.element).data("sortable-item", true);
 468                      this.instance.options._helper = this.instance.options.helper; //Store helper option to later restore it

 469                      this.instance.options.helper = function() { return ui.helper[0]; };
 470  
 471                      event.target = this.instance.currentItem[0];
 472                      this.instance._mouseCapture(event, true);
 473                      this.instance._mouseStart(event, true, true);
 474  
 475                      //Because the browser event is way off the new appended portlet, we modify a couple of variables to reflect the changes

 476                      this.instance.offset.click.top = inst.offset.click.top;
 477                      this.instance.offset.click.left = inst.offset.click.left;
 478                      this.instance.offset.parent.left -= inst.offset.parent.left - this.instance.offset.parent.left;
 479                      this.instance.offset.parent.top -= inst.offset.parent.top - this.instance.offset.parent.top;
 480  
 481                      inst._propagate("toSortable", event);
 482  
 483                  }
 484  
 485                  //Provided we did all the previous steps, we can fire the drag event of the sortable on every draggable drag, when it intersects with the sortable

 486                  if(this.instance.currentItem) this.instance._mouseDrag(event);
 487  
 488              } else {
 489  
 490                  //If it doesn't intersect with the sortable, and it intersected before,

 491                  //we fake the drag stop of the sortable, but make sure it doesn't remove the helper by using cancelHelperRemoval

 492                  if(this.instance.isOver) {
 493                      this.instance.isOver = 0;
 494                      this.instance.cancelHelperRemoval = true;
 495                      this.instance.options.revert = false; //No revert here

 496                      this.instance._mouseStop(event, true);
 497                      this.instance.options.helper = this.instance.options._helper;
 498  
 499                      //Now we remove our currentItem, the list group clone again, and the placeholder, and animate the helper back to it's original size

 500                      this.instance.currentItem.remove();
 501                      if(this.instance.placeholder) this.instance.placeholder.remove();
 502  
 503                      inst._propagate("fromSortable", event);
 504                  }
 505  
 506              };
 507  
 508          });
 509  
 510      }
 511  });
 512  
 513  $.ui.plugin.add("draggable", "cursor", {
 514      start: function(event, ui) {
 515          var t = $('body');
 516          if (t.css("cursor")) ui.options._cursor = t.css("cursor");
 517          t.css("cursor", ui.options.cursor);
 518      },
 519      stop: function(event, ui) {
 520          if (ui.options._cursor) $('body').css("cursor", ui.options._cursor);
 521      }
 522  });
 523  
 524  $.ui.plugin.add("draggable", "iframeFix", {
 525      start: function(event, ui) {
 526          $(ui.options.iframeFix === true ? "iframe" : ui.options.iframeFix).each(function() {
 527              $('<div class="ui-draggable-iframeFix" style="background: #fff;"></div>')
 528              .css({
 529                  width: this.offsetWidth+"px", height: this.offsetHeight+"px",
 530                  position: "absolute", opacity: "0.001", zIndex: 1000
 531              })
 532              .css($(this).offset())
 533              .appendTo("body");
 534          });
 535      },
 536      stop: function(event, ui) {
 537          $("div.ui-draggable-iframeFix").each(function() { this.parentNode.removeChild(this); }); //Remove frame helpers

 538      }
 539  });
 540  
 541  $.ui.plugin.add("draggable", "opacity", {
 542      start: function(event, ui) {
 543          var t = $(ui.helper);
 544          if(t.css("opacity")) ui.options._opacity = t.css("opacity");
 545          t.css('opacity', ui.options.opacity);
 546      },
 547      stop: function(event, ui) {
 548          if(ui.options._opacity) $(ui.helper).css('opacity', ui.options._opacity);
 549      }
 550  });
 551  
 552  $.ui.plugin.add("draggable", "scroll", {
 553      start: function(event, ui) {
 554          var o = ui.options;
 555          var i = $(this).data("draggable");
 556  
 557          if(i.scrollParent[0] != document && i.scrollParent[0].tagName != 'HTML') i.overflowOffset = i.scrollParent.offset();
 558  
 559      },
 560      drag: function(event, ui) {
 561  
 562          var o = ui.options, scrolled = false;
 563          var i = $(this).data("draggable");
 564  
 565          if(i.scrollParent[0] != document && i.scrollParent[0].tagName != 'HTML') {
 566  
 567              if((i.overflowOffset.top + i.scrollParent[0].offsetHeight) - event.pageY < o.scrollSensitivity)
 568                  i.scrollParent[0].scrollTop = scrolled = i.scrollParent[0].scrollTop + o.scrollSpeed;
 569              else if(event.pageY - i.overflowOffset.top < o.scrollSensitivity)
 570                  i.scrollParent[0].scrollTop = scrolled = i.scrollParent[0].scrollTop - o.scrollSpeed;
 571  
 572              if((i.overflowOffset.left + i.scrollParent[0].offsetWidth) - event.pageX < o.scrollSensitivity)
 573                  i.scrollParent[0].scrollLeft = scrolled = i.scrollParent[0].scrollLeft + o.scrollSpeed;
 574              else if(event.pageX - i.overflowOffset.left < o.scrollSensitivity)
 575                  i.scrollParent[0].scrollLeft = scrolled = i.scrollParent[0].scrollLeft - o.scrollSpeed;
 576  
 577          } else {
 578  
 579              if(event.pageY - $(document).scrollTop() < o.scrollSensitivity)
 580                  scrolled = $(document).scrollTop($(document).scrollTop() - o.scrollSpeed);
 581              else if($(window).height() - (event.pageY - $(document).scrollTop()) < o.scrollSensitivity)
 582                  scrolled = $(document).scrollTop($(document).scrollTop() + o.scrollSpeed);
 583  
 584              if(event.pageX - $(document).scrollLeft() < o.scrollSensitivity)
 585                  scrolled = $(document).scrollLeft($(document).scrollLeft() - o.scrollSpeed);
 586              else if($(window).width() - (event.pageX - $(document).scrollLeft()) < o.scrollSensitivity)
 587                  scrolled = $(document).scrollLeft($(document).scrollLeft() + o.scrollSpeed);
 588  
 589          }
 590  
 591          if(scrolled !== false && $.ui.ddmanager && !o.dropBehaviour)
 592              $.ui.ddmanager.prepareOffsets(i, event);
 593  
 594  
 595  
 596          // This is a special case where we need to modify a offset calculated on start, since the following happened:

 597          // 1. The position of the helper is absolute, so it's position is calculated based on the next positioned parent

 598          // 2. The actual offset parent is a child of the scroll parent, and the scroll parent isn't the document, which means that

 599          //    the scroll is included in the initial calculation of the offset of the parent, and never recalculated upon drag

 600          if(scrolled !== false && i.cssPosition == 'absolute' && i.scrollParent[0] != document && $.ui.contains(i.scrollParent[0], i.offsetParent[0])) {
 601              i.offset.parent = i._getParentOffset();
 602              
 603          }
 604          
 605          // This is another very weird special case that only happens for relative elements:

 606          // 1. If the css position is relative

 607          // 2. and the scroll parent is the document or similar to the offset parent

 608          // we have to refresh the relative offset during the scroll so there are no jumps

 609          if(scrolled !== false && i.cssPosition == 'relative' && !(i.scrollParent[0] != document && i.scrollParent[0] != i.offsetParent[0])) {
 610              i.offset.relative = i._getRelativeOffset();
 611          }
 612          
 613  
 614      }
 615  });
 616  
 617  $.ui.plugin.add("draggable", "snap", {
 618      start: function(event, ui) {
 619  
 620          var inst = $(this).data("draggable");
 621          inst.snapElements = [];
 622  
 623          $(ui.options.snap.constructor != String ? ( ui.options.snap.items || ':data(draggable)' ) : ui.options.snap).each(function() {
 624              var $t = $(this); var $o = $t.offset();
 625              if(this != inst.element[0]) inst.snapElements.push({
 626                  item: this,
 627                  width: $t.outerWidth(), height: $t.outerHeight(),
 628                  top: $o.top, left: $o.left
 629              });
 630          });
 631  
 632      },
 633      drag: function(event, ui) {
 634  
 635          var inst = $(this).data("draggable");
 636          var d = ui.options.snapTolerance;
 637  
 638          var x1 = ui.absolutePosition.left, x2 = x1 + inst.helperProportions.width,
 639              y1 = ui.absolutePosition.top, y2 = y1 + inst.helperProportions.height;
 640  
 641          for (var i = inst.snapElements.length - 1; i >= 0; i--){
 642  
 643              var l = inst.snapElements[i].left, r = l + inst.snapElements[i].width,
 644                  t = inst.snapElements[i].top, b = t + inst.snapElements[i].height;
 645  
 646              //Yes, I know, this is insane ;)

 647              if(!((l-d < x1 && x1 < r+d && t-d < y1 && y1 < b+d) || (l-d < x1 && x1 < r+d && t-d < y2 && y2 < b+d) || (l-d < x2 && x2 < r+d && t-d < y1 && y1 < b+d) || (l-d < x2 && x2 < r+d && t-d < y2 && y2 < b+d))) {
 648                  if(inst.snapElements[i].snapping) (inst.options.snap.release && inst.options.snap.release.call(inst.element, event, $.extend(inst._uiHash(), { snapItem: inst.snapElements[i].item })));
 649                  inst.snapElements[i].snapping = false;
 650                  continue;
 651              }
 652  
 653              if(ui.options.snapMode != 'inner') {
 654                  var ts = Math.abs(t - y2) <= d;
 655                  var bs = Math.abs(b - y1) <= d;
 656                  var ls = Math.abs(l - x2) <= d;
 657                  var rs = Math.abs(r - x1) <= d;
 658                  if(ts) ui.position.top = inst._convertPositionTo("relative", { top: t - inst.helperProportions.height, left: 0 }).top;
 659                  if(bs) ui.position.top = inst._convertPositionTo("relative", { top: b, left: 0 }).top;
 660                  if(ls) ui.position.left = inst._convertPositionTo("relative", { top: 0, left: l - inst.helperProportions.width }).left;
 661                  if(rs) ui.position.left = inst._convertPositionTo("relative", { top: 0, left: r }).left;
 662              }
 663  
 664              var first = (ts || bs || ls || rs);
 665  
 666              if(ui.options.snapMode != 'outer') {
 667                  var ts = Math.abs(t - y1) <= d;
 668                  var bs = Math.abs(b - y2) <= d;
 669                  var ls = Math.abs(l - x1) <= d;
 670                  var rs = Math.abs(r - x2) <= d;
 671                  if(ts) ui.position.top = inst._convertPositionTo("relative", { top: t, left: 0 }).top;
 672                  if(bs) ui.position.top = inst._convertPositionTo("relative", { top: b - inst.helperProportions.height, left: 0 }).top;
 673                  if(ls) ui.position.left = inst._convertPositionTo("relative", { top: 0, left: l }).left;
 674                  if(rs) ui.position.left = inst._convertPositionTo("relative", { top: 0, left: r - inst.helperProportions.width }).left;
 675              }
 676  
 677              if(!inst.snapElements[i].snapping && (ts || bs || ls || rs || first))
 678                  (inst.options.snap.snap && inst.options.snap.snap.call(inst.element, event, $.extend(inst._uiHash(), { snapItem: inst.snapElements[i].item })));
 679              inst.snapElements[i].snapping = (ts || bs || ls || rs || first);
 680  
 681          };
 682  
 683      }
 684  });
 685  
 686  $.ui.plugin.add("draggable", "stack", {
 687      start: function(event, ui) {
 688          var group = $.makeArray($(ui.options.stack.group)).sort(function(a,b) {
 689              return (parseInt($(a).css("zIndex"),10) || ui.options.stack.min) - (parseInt($(b).css("zIndex"),10) || ui.options.stack.min);
 690          });
 691  
 692          $(group).each(function(i) {
 693              this.style.zIndex = ui.options.stack.min + i;
 694          });
 695  
 696          this[0].style.zIndex = ui.options.stack.min + group.length;
 697      }
 698  });
 699  
 700  $.ui.plugin.add("draggable", "zIndex", {
 701      start: function(event, ui) {
 702          var t = $(ui.helper);
 703          if(t.css("zIndex")) ui.options._zIndex = t.css("zIndex");
 704          t.css('zIndex', ui.options.zIndex);
 705      },
 706      stop: function(event, ui) {
 707          if(ui.options._zIndex) $(ui.helper).css('zIndex', ui.options._zIndex);
 708      }
 709  });
 710  
 711  })(jQuery);