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jquery.ui.sortable.js
1276 lines (1018 loc) · 41.3 KB
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jquery.ui.sortable.js
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/*!
* jQuery UI Sortable @VERSION
* http://jqueryui.com
*
* Copyright 2013 jQuery Foundation and other contributors
* Released under the MIT license.
* http://jquery.org/license
*
* http://api.jqueryui.com/sortable/
*
* Depends:
* jquery.ui.core.js
* jquery.ui.mouse.js
* jquery.ui.widget.js
*/
(function( $, undefined ) {
/*jshint loopfunc: true */
function isOverAxis( x, reference, size ) {
return ( x > reference ) && ( x < ( reference + size ) );
}
function isFloating(item) {
return (/left|right/).test(item.css("float")) || (/inline|table-cell/).test(item.css("display"));
}
$.widget("ui.sortable", $.ui.mouse, {
version: "@VERSION",
widgetEventPrefix: "sort",
ready: false,
options: {
appendTo: "parent",
axis: false,
connectWith: false,
containment: false,
cursor: "auto",
cursorAt: false,
dropOnEmpty: true,
forcePlaceholderSize: false,
forceHelperSize: false,
grid: false,
handle: false,
helper: "original",
items: "> *",
opacity: false,
placeholder: false,
revert: false,
scroll: true,
scrollSensitivity: 20,
scrollSpeed: 20,
scope: "default",
tolerance: "intersect",
zIndex: 1000,
// callbacks
activate: null,
beforeStop: null,
change: null,
deactivate: null,
out: null,
over: null,
receive: null,
remove: null,
sort: null,
start: null,
stop: null,
update: null
},
_create: function() {
var o = this.options;
this.containerCache = {};
this.element.addClass("ui-sortable");
//Get the items
this.refresh();
//Let's determine if the items are being displayed horizontally
this.floating = this.items.length ? o.axis === "x" || isFloating(this.items[0].item) : false;
//Let's determine the parent's offset
this.offset = this.element.offset();
//Initialize mouse events for interaction
this._mouseInit();
//We're ready to go
this.ready = true;
},
_destroy: function() {
this.element
.removeClass("ui-sortable ui-sortable-disabled");
this._mouseDestroy();
for ( var i = this.items.length - 1; i >= 0; i-- ) {
this.items[i].item.removeData(this.widgetName + "-item");
}
return this;
},
_setOption: function(key, value){
if ( key === "disabled" ) {
this.options[ key ] = value;
this.widget().toggleClass( "ui-sortable-disabled", !!value );
} else {
// Don't call widget base _setOption for disable as it adds ui-state-disabled class
$.Widget.prototype._setOption.apply(this, arguments);
}
},
_mouseCapture: function(event, overrideHandle) {
var currentItem = null,
validHandle = false,
that = this;
if (this.reverting) {
return false;
}
if(this.options.disabled || this.options.type === "static") {
return false;
}
//We have to refresh the items data once first
this._refreshItems(event);
//Find out if the clicked node (or one of its parents) is a actual item in this.items
$(event.target).parents().each(function() {
if($.data(this, that.widgetName + "-item") === that) {
currentItem = $(this);
return false;
}
});
if($.data(event.target, that.widgetName + "-item") === that) {
currentItem = $(event.target);
}
if(!currentItem) {
return false;
}
if(this.options.handle && !overrideHandle) {
$(this.options.handle, currentItem).find("*").addBack().each(function() {
if(this === event.target) {
validHandle = true;
}
});
if(!validHandle) {
return false;
}
}
this.currentItem = currentItem;
this._removeCurrentsFromItems();
return true;
},
_mouseStart: function(event, overrideHandle, noActivation) {
var i, body,
o = this.options;
this.currentContainer = this;
//We only need to call refreshPositions, because the refreshItems call has been moved to mouseCapture
this.refreshPositions();
//Create and append the visible helper
this.helper = this._createHelper(event);
//Cache the helper size
this._cacheHelperProportions();
/*
* - Position generation -
* This block generates everything position related - it's the core of draggables.
*/
//Cache the margins of the original element
this._cacheMargins();
//Get the next scrolling parent
this.scrollParent = this.helper.scrollParent();
//The element's absolute position on the page minus margins
this.offset = this.currentItem.offset();
this.offset = {
top: this.offset.top - this.margins.top,
left: this.offset.left - this.margins.left
};
$.extend(this.offset, {
click: { //Where the click happened, relative to the element
left: event.pageX - this.offset.left,
top: event.pageY - this.offset.top
},
parent: this._getParentOffset(),
relative: this._getRelativeOffset() //This is a relative to absolute position minus the actual position calculation - only used for relative positioned helper
});
// Only after we got the offset, we can change the helper's position to absolute
// TODO: Still need to figure out a way to make relative sorting possible
this.helper.css("position", "absolute");
this.cssPosition = this.helper.css("position");
//Generate the original position
this.originalPosition = this._generatePosition(event);
this.originalPageX = event.pageX;
this.originalPageY = event.pageY;
//Adjust the mouse offset relative to the helper if "cursorAt" is supplied
(o.cursorAt && this._adjustOffsetFromHelper(o.cursorAt));
//Cache the former DOM position
this.domPosition = { prev: this.currentItem.prev()[0], parent: this.currentItem.parent()[0] };
//If the helper is not the original, hide the original so it's not playing any role during the drag, won't cause anything bad this way
if(this.helper[0] !== this.currentItem[0]) {
this.currentItem.hide();
}
//Create the placeholder
this._createPlaceholder();
//Set a containment if given in the options
if(o.containment) {
this._setContainment();
}
if( o.cursor && o.cursor !== "auto" ) { // cursor option
body = this.document.find( "body" );
// support: IE
this.storedCursor = body.css( "cursor" );
body.css( "cursor", o.cursor );
this.storedStylesheet = $( "<style>*{ cursor: "+o.cursor+" !important; }</style>" ).appendTo( body );
}
if(o.opacity) { // opacity option
if (this.helper.css("opacity")) {
this._storedOpacity = this.helper.css("opacity");
}
this.helper.css("opacity", o.opacity);
}
if(o.zIndex) { // zIndex option
if (this.helper.css("zIndex")) {
this._storedZIndex = this.helper.css("zIndex");
}
this.helper.css("zIndex", o.zIndex);
}
//Prepare scrolling
if(this.scrollParent[0] !== document && this.scrollParent[0].tagName !== "HTML") {
this.overflowOffset = this.scrollParent.offset();
}
//Call callbacks
this._trigger("start", event, this._uiHash());
//Recache the helper size
if(!this._preserveHelperProportions) {
this._cacheHelperProportions();
}
//Post "activate" events to possible containers
if( !noActivation ) {
for ( i = this.containers.length - 1; i >= 0; i-- ) {
this.containers[ i ]._trigger( "activate", event, this._uiHash( this ) );
}
}
//Prepare possible droppables
if($.ui.ddmanager) {
$.ui.ddmanager.current = this;
}
if ($.ui.ddmanager && !o.dropBehaviour) {
$.ui.ddmanager.prepareOffsets(this, event);
}
this.dragging = true;
this.helper.addClass("ui-sortable-helper");
this._mouseDrag(event); //Execute the drag once - this causes the helper not to be visible before getting its correct position
return true;
},
_mouseDrag: function(event) {
var i, item, itemElement, intersection,
o = this.options,
scrolled = false;
//Compute the helpers position
this.position = this._generatePosition(event);
this.positionAbs = this._convertPositionTo("absolute");
if (!this.lastPositionAbs) {
this.lastPositionAbs = this.positionAbs;
}
//Do scrolling
if(this.options.scroll) {
if(this.scrollParent[0] !== document && this.scrollParent[0].tagName !== "HTML") {
if((this.overflowOffset.top + this.scrollParent[0].offsetHeight) - event.pageY < o.scrollSensitivity) {
this.scrollParent[0].scrollTop = scrolled = this.scrollParent[0].scrollTop + o.scrollSpeed;
} else if(event.pageY - this.overflowOffset.top < o.scrollSensitivity) {
this.scrollParent[0].scrollTop = scrolled = this.scrollParent[0].scrollTop - o.scrollSpeed;
}
if((this.overflowOffset.left + this.scrollParent[0].offsetWidth) - event.pageX < o.scrollSensitivity) {
this.scrollParent[0].scrollLeft = scrolled = this.scrollParent[0].scrollLeft + o.scrollSpeed;
} else if(event.pageX - this.overflowOffset.left < o.scrollSensitivity) {
this.scrollParent[0].scrollLeft = scrolled = this.scrollParent[0].scrollLeft - o.scrollSpeed;
}
} else {
if(event.pageY - $(document).scrollTop() < o.scrollSensitivity) {
scrolled = $(document).scrollTop($(document).scrollTop() - o.scrollSpeed);
} else if($(window).height() - (event.pageY - $(document).scrollTop()) < o.scrollSensitivity) {
scrolled = $(document).scrollTop($(document).scrollTop() + o.scrollSpeed);
}
if(event.pageX - $(document).scrollLeft() < o.scrollSensitivity) {
scrolled = $(document).scrollLeft($(document).scrollLeft() - o.scrollSpeed);
} else if($(window).width() - (event.pageX - $(document).scrollLeft()) < o.scrollSensitivity) {
scrolled = $(document).scrollLeft($(document).scrollLeft() + o.scrollSpeed);
}
}
if(scrolled !== false && $.ui.ddmanager && !o.dropBehaviour) {
$.ui.ddmanager.prepareOffsets(this, event);
}
}
//Regenerate the absolute position used for position checks
this.positionAbs = this._convertPositionTo("absolute");
//Set the helper position
if(!this.options.axis || this.options.axis !== "y") {
this.helper[0].style.left = this.position.left+"px";
}
if(!this.options.axis || this.options.axis !== "x") {
this.helper[0].style.top = this.position.top+"px";
}
//Rearrange
for (i = this.items.length - 1; i >= 0; i--) {
//Cache variables and intersection, continue if no intersection
item = this.items[i];
itemElement = item.item[0];
intersection = this._intersectsWithPointer(item);
if (!intersection) {
continue;
}
// Only put the placeholder inside the current Container, skip all
// items form other containers. This works because when moving
// an item from one container to another the
// currentContainer is switched before the placeholder is moved.
//
// Without this moving items in "sub-sortables" can cause the placeholder to jitter
// beetween the outer and inner container.
if (item.instance !== this.currentContainer) {
continue;
}
// cannot intersect with itself
// no useless actions that have been done before
// no action if the item moved is the parent of the item checked
if (itemElement !== this.currentItem[0] &&
this.placeholder[intersection === 1 ? "next" : "prev"]()[0] !== itemElement &&
!$.contains(this.placeholder[0], itemElement) &&
(this.options.type === "semi-dynamic" ? !$.contains(this.element[0], itemElement) : true)
) {
this.direction = intersection === 1 ? "down" : "up";
if (this.options.tolerance === "pointer" || this._intersectsWithSides(item)) {
this._rearrange(event, item);
} else {
break;
}
this._trigger("change", event, this._uiHash());
break;
}
}
//Post events to containers
this._contactContainers(event);
//Interconnect with droppables
if($.ui.ddmanager) {
$.ui.ddmanager.drag(this, event);
}
//Call callbacks
this._trigger("sort", event, this._uiHash());
this.lastPositionAbs = this.positionAbs;
return false;
},
_mouseStop: function(event, noPropagation) {
if(!event) {
return;
}
//If we are using droppables, inform the manager about the drop
if ($.ui.ddmanager && !this.options.dropBehaviour) {
$.ui.ddmanager.drop(this, event);
}
if(this.options.revert) {
var that = this,
cur = this.placeholder.offset();
this.reverting = true;
$(this.helper).animate({
left: cur.left - this.offset.parent.left - this.margins.left + (this.offsetParent[0] === document.body ? 0 : this.offsetParent[0].scrollLeft),
top: cur.top - this.offset.parent.top - this.margins.top + (this.offsetParent[0] === document.body ? 0 : this.offsetParent[0].scrollTop)
}, parseInt(this.options.revert, 10) || 500, function() {
that._clear(event);
});
} else {
this._clear(event, noPropagation);
}
return false;
},
cancel: function() {
if(this.dragging) {
this._mouseUp({ target: null });
if(this.options.helper === "original") {
this.currentItem.css(this._storedCSS).removeClass("ui-sortable-helper");
} else {
this.currentItem.show();
}
//Post deactivating events to containers
for (var i = this.containers.length - 1; i >= 0; i--){
this.containers[i]._trigger("deactivate", null, this._uiHash(this));
if(this.containers[i].containerCache.over) {
this.containers[i]._trigger("out", null, this._uiHash(this));
this.containers[i].containerCache.over = 0;
}
}
}
if (this.placeholder) {
//$(this.placeholder[0]).remove(); would have been the jQuery way - unfortunately, it unbinds ALL events from the original node!
if(this.placeholder[0].parentNode) {
this.placeholder[0].parentNode.removeChild(this.placeholder[0]);
}
if(this.options.helper !== "original" && this.helper && this.helper[0].parentNode) {
this.helper.remove();
}
$.extend(this, {
helper: null,
dragging: false,
reverting: false,
_noFinalSort: null
});
if(this.domPosition.prev) {
$(this.domPosition.prev).after(this.currentItem);
} else {
$(this.domPosition.parent).prepend(this.currentItem);
}
}
return this;
},
serialize: function(o) {
var items = this._getItemsAsjQuery(o && o.connected),
str = [];
o = o || {};
$(items).each(function() {
var res = ($(o.item || this).attr(o.attribute || "id") || "").match(o.expression || (/(.+)[\-=_](.+)/));
if (res) {
str.push((o.key || res[1]+"[]")+"="+(o.key && o.expression ? res[1] : res[2]));
}
});
if(!str.length && o.key) {
str.push(o.key + "=");
}
return str.join("&");
},
toArray: function(o) {
var items = this._getItemsAsjQuery(o && o.connected),
ret = [];
o = o || {};
items.each(function() { ret.push($(o.item || this).attr(o.attribute || "id") || ""); });
return ret;
},
/* Be careful with the following core functions */
_intersectsWith: function(item) {
var x1 = this.positionAbs.left,
x2 = x1 + this.helperProportions.width,
y1 = this.positionAbs.top,
y2 = y1 + this.helperProportions.height,
l = item.left,
r = l + item.width,
t = item.top,
b = t + item.height,
dyClick = this.offset.click.top,
dxClick = this.offset.click.left,
isOverElement = (y1 + dyClick) > t && (y1 + dyClick) < b && (x1 + dxClick) > l && (x1 + dxClick) < r;
if ( this.options.tolerance === "pointer" ||
this.options.forcePointerForContainers ||
(this.options.tolerance !== "pointer" && this.helperProportions[this.floating ? "width" : "height"] > item[this.floating ? "width" : "height"])
) {
return isOverElement;
} else {
return (l < x1 + (this.helperProportions.width / 2) && // Right Half
x2 - (this.helperProportions.width / 2) < r && // Left Half
t < y1 + (this.helperProportions.height / 2) && // Bottom Half
y2 - (this.helperProportions.height / 2) < b ); // Top Half
}
},
_intersectsWithPointer: function(item) {
var isOverElementHeight = (this.options.axis === "x") || isOverAxis(this.positionAbs.top + this.offset.click.top, item.top, item.height),
isOverElementWidth = (this.options.axis === "y") || isOverAxis(this.positionAbs.left + this.offset.click.left, item.left, item.width),
isOverElement = isOverElementHeight && isOverElementWidth,
verticalDirection = this._getDragVerticalDirection(),
horizontalDirection = this._getDragHorizontalDirection();
if (!isOverElement) {
return false;
}
return this.floating ?
( ((horizontalDirection && horizontalDirection === "right") || verticalDirection === "down") ? 2 : 1 )
: ( verticalDirection && (verticalDirection === "down" ? 2 : 1) );
},
_intersectsWithSides: function(item) {
var isOverBottomHalf = isOverAxis(this.positionAbs.top + this.offset.click.top, item.top + (item.height/2), item.height),
isOverRightHalf = isOverAxis(this.positionAbs.left + this.offset.click.left, item.left + (item.width/2), item.width),
verticalDirection = this._getDragVerticalDirection(),
horizontalDirection = this._getDragHorizontalDirection();
if (this.floating && horizontalDirection) {
return ((horizontalDirection === "right" && isOverRightHalf) || (horizontalDirection === "left" && !isOverRightHalf));
} else {
return verticalDirection && ((verticalDirection === "down" && isOverBottomHalf) || (verticalDirection === "up" && !isOverBottomHalf));
}
},
_getDragVerticalDirection: function() {
var delta = this.positionAbs.top - this.lastPositionAbs.top;
return delta !== 0 && (delta > 0 ? "down" : "up");
},
_getDragHorizontalDirection: function() {
var delta = this.positionAbs.left - this.lastPositionAbs.left;
return delta !== 0 && (delta > 0 ? "right" : "left");
},
refresh: function(event) {
this._refreshItems(event);
this.refreshPositions();
return this;
},
_connectWith: function() {
var options = this.options;
return options.connectWith.constructor === String ? [options.connectWith] : options.connectWith;
},
_getItemsAsjQuery: function(connected) {
var i, j, cur, inst,
items = [],
queries = [],
connectWith = this._connectWith();
if(connectWith && connected) {
for (i = connectWith.length - 1; i >= 0; i--){
cur = $(connectWith[i]);
for ( j = cur.length - 1; j >= 0; j--){
inst = $.data(cur[j], this.widgetFullName);
if(inst && inst !== this && !inst.options.disabled) {
queries.push([$.isFunction(inst.options.items) ? inst.options.items.call(inst.element) : $(inst.options.items, inst.element).not(".ui-sortable-helper").not(".ui-sortable-placeholder"), inst]);
}
}
}
}
queries.push([$.isFunction(this.options.items) ? this.options.items.call(this.element, null, { options: this.options, item: this.currentItem }) : $(this.options.items, this.element).not(".ui-sortable-helper").not(".ui-sortable-placeholder"), this]);
for (i = queries.length - 1; i >= 0; i--){
queries[i][0].each(function() {
items.push(this);
});
}
return $(items);
},
_removeCurrentsFromItems: function() {
var list = this.currentItem.find(":data(" + this.widgetName + "-item)");
this.items = $.grep(this.items, function (item) {
for (var j=0; j < list.length; j++) {
if(list[j] === item.item[0]) {
return false;
}
}
return true;
});
},
_refreshItems: function(event) {
this.items = [];
this.containers = [this];
var i, j, cur, inst, targetData, _queries, item, queriesLength,
items = this.items,
queries = [[$.isFunction(this.options.items) ? this.options.items.call(this.element[0], event, { item: this.currentItem }) : $(this.options.items, this.element), this]],
connectWith = this._connectWith();
if(connectWith && this.ready) { //Shouldn't be run the first time through due to massive slow-down
for (i = connectWith.length - 1; i >= 0; i--){
cur = $(connectWith[i]);
for (j = cur.length - 1; j >= 0; j--){
inst = $.data(cur[j], this.widgetFullName);
if(inst && inst !== this && !inst.options.disabled) {
queries.push([$.isFunction(inst.options.items) ? inst.options.items.call(inst.element[0], event, { item: this.currentItem }) : $(inst.options.items, inst.element), inst]);
this.containers.push(inst);
}
}
}
}
for (i = queries.length - 1; i >= 0; i--) {
targetData = queries[i][1];
_queries = queries[i][0];
for (j=0, queriesLength = _queries.length; j < queriesLength; j++) {
item = $(_queries[j]);
item.data(this.widgetName + "-item", targetData); // Data for target checking (mouse manager)
items.push({
item: item,
instance: targetData,
width: 0, height: 0,
left: 0, top: 0
});
}
}
},
refreshPositions: function(fast) {
//This has to be redone because due to the item being moved out/into the offsetParent, the offsetParent's position will change
if(this.offsetParent && this.helper) {
this.offset.parent = this._getParentOffset();
}
var i, item, t, p;
for (i = this.items.length - 1; i >= 0; i--){
item = this.items[i];
//We ignore calculating positions of all connected containers when we're not over them
if(item.instance !== this.currentContainer && this.currentContainer && item.item[0] !== this.currentItem[0]) {
continue;
}
t = this.options.toleranceElement ? $(this.options.toleranceElement, item.item) : item.item;
if (!fast) {
item.width = t.outerWidth();
item.height = t.outerHeight();
}
p = t.offset();
item.left = p.left;
item.top = p.top;
}
if(this.options.custom && this.options.custom.refreshContainers) {
this.options.custom.refreshContainers.call(this);
} else {
for (i = this.containers.length - 1; i >= 0; i--){
p = this.containers[i].element.offset();
this.containers[i].containerCache.left = p.left;
this.containers[i].containerCache.top = p.top;
this.containers[i].containerCache.width = this.containers[i].element.outerWidth();
this.containers[i].containerCache.height = this.containers[i].element.outerHeight();
}
}
return this;
},
_createPlaceholder: function(that) {
that = that || this;
var className,
o = that.options;
if(!o.placeholder || o.placeholder.constructor === String) {
className = o.placeholder;
o.placeholder = {
element: function() {
var nodeName = that.currentItem[0].nodeName.toLowerCase(),
element = $( that.document[0].createElement( nodeName ) )
.addClass(className || that.currentItem[0].className+" ui-sortable-placeholder")
.removeClass("ui-sortable-helper");
if ( nodeName === "tr" ) {
// Use a high colspan to force the td to expand the full
// width of the table (browsers are smart enough to
// handle this properly)
element.append( "<td colspan='99'> </td>" );
} else if ( nodeName === "img" ) {
element.attr( "src", that.currentItem.attr( "src" ) );
}
if ( !className ) {
element.css( "visibility", "hidden" );
}
return element;
},
update: function(container, p) {
// 1. If a className is set as 'placeholder option, we don't force sizes - the class is responsible for that
// 2. The option 'forcePlaceholderSize can be enabled to force it even if a class name is specified
if(className && !o.forcePlaceholderSize) {
return;
}
//If the element doesn't have a actual height by itself (without styles coming from a stylesheet), it receives the inline height from the dragged item
if(!p.height()) { p.height(that.currentItem.innerHeight() - parseInt(that.currentItem.css("paddingTop")||0, 10) - parseInt(that.currentItem.css("paddingBottom")||0, 10)); }
if(!p.width()) { p.width(that.currentItem.innerWidth() - parseInt(that.currentItem.css("paddingLeft")||0, 10) - parseInt(that.currentItem.css("paddingRight")||0, 10)); }
}
};
}
//Create the placeholder
that.placeholder = $(o.placeholder.element.call(that.element, that.currentItem));
//Append it after the actual current item
that.currentItem.after(that.placeholder);
//Update the size of the placeholder (TODO: Logic to fuzzy, see line 316/317)
o.placeholder.update(that, that.placeholder);
},
_contactContainers: function(event) {
var i, j, dist, itemWithLeastDistance, posProperty, sizeProperty, base, cur, nearBottom, floating,
innermostContainer = null,
innermostIndex = null;
// get innermost container that intersects with item
for (i = this.containers.length - 1; i >= 0; i--) {
// never consider a container that's located within the item itself
if($.contains(this.currentItem[0], this.containers[i].element[0])) {
continue;
}
if(this._intersectsWith(this.containers[i].containerCache)) {
// if we've already found a container and it's more "inner" than this, then continue
if(innermostContainer && $.contains(this.containers[i].element[0], innermostContainer.element[0])) {
continue;
}
innermostContainer = this.containers[i];
innermostIndex = i;
} else {
// container doesn't intersect. trigger "out" event if necessary
if(this.containers[i].containerCache.over) {
this.containers[i]._trigger("out", event, this._uiHash(this));
this.containers[i].containerCache.over = 0;
}
}
}
// if no intersecting containers found, return
if(!innermostContainer) {
return;
}
// move the item into the container if it's not there already
if(this.containers.length === 1) {
this.containers[innermostIndex]._trigger("over", event, this._uiHash(this));
this.containers[innermostIndex].containerCache.over = 1;
} else {
//When entering a new container, we will find the item with the least distance and append our item near it
dist = 10000;
itemWithLeastDistance = null;
floating = innermostContainer.floating || isFloating(this.currentItem);
posProperty = floating ? "left" : "top";
sizeProperty = floating ? "width" : "height";
base = this.positionAbs[posProperty] + this.offset.click[posProperty];
for (j = this.items.length - 1; j >= 0; j--) {
if(!$.contains(this.containers[innermostIndex].element[0], this.items[j].item[0])) {
continue;
}
if(this.items[j].item[0] === this.currentItem[0]) {
continue;
}
if (floating && !isOverAxis(this.positionAbs.top + this.offset.click.top, this.items[j].top, this.items[j].height)) {
continue;
}
cur = this.items[j].item.offset()[posProperty];
nearBottom = false;
if(Math.abs(cur - base) > Math.abs(cur + this.items[j][sizeProperty] - base)){
nearBottom = true;
cur += this.items[j][sizeProperty];
}
if(Math.abs(cur - base) < dist) {
dist = Math.abs(cur - base); itemWithLeastDistance = this.items[j];
this.direction = nearBottom ? "up": "down";
}
}
//Check if dropOnEmpty is enabled
if(!itemWithLeastDistance && !this.options.dropOnEmpty) {
return;
}
if(this.currentContainer === this.containers[innermostIndex]) {
return;
}
itemWithLeastDistance ? this._rearrange(event, itemWithLeastDistance, null, true) : this._rearrange(event, null, this.containers[innermostIndex].element, true);
this._trigger("change", event, this._uiHash());
this.containers[innermostIndex]._trigger("change", event, this._uiHash(this));
this.currentContainer = this.containers[innermostIndex];
//Update the placeholder
this.options.placeholder.update(this.currentContainer, this.placeholder);
this.containers[innermostIndex]._trigger("over", event, this._uiHash(this));
this.containers[innermostIndex].containerCache.over = 1;
}
},
_createHelper: function(event) {
var o = this.options,
helper = $.isFunction(o.helper) ? $(o.helper.apply(this.element[0], [event, this.currentItem])) : (o.helper === "clone" ? this.currentItem.clone() : this.currentItem);
//Add the helper to the DOM if that didn't happen already
if(!helper.parents("body").length) {
$(o.appendTo !== "parent" ? o.appendTo : this.currentItem[0].parentNode)[0].appendChild(helper[0]);
}
if(helper[0] === this.currentItem[0]) {
this._storedCSS = { width: this.currentItem[0].style.width, height: this.currentItem[0].style.height, position: this.currentItem.css("position"), top: this.currentItem.css("top"), left: this.currentItem.css("left") };
}
if(!helper[0].style.width || o.forceHelperSize) {
helper.width(this.currentItem.width());
}
if(!helper[0].style.height || o.forceHelperSize) {
helper.height(this.currentItem.height());
}
return helper;
},
_adjustOffsetFromHelper: function(obj) {
if (typeof obj === "string") {
obj = obj.split(" ");
}
if ($.isArray(obj)) {
obj = {left: +obj[0], top: +obj[1] || 0};
}
if ("left" in obj) {
this.offset.click.left = obj.left + this.margins.left;
}
if ("right" in obj) {
this.offset.click.left = this.helperProportions.width - obj.right + this.margins.left;
}
if ("top" in obj) {
this.offset.click.top = obj.top + this.margins.top;
}
if ("bottom" in obj) {
this.offset.click.top = this.helperProportions.height - obj.bottom + this.margins.top;
}
},
_getParentOffset: function() {
//Get the offsetParent and cache its position
this.offsetParent = this.helper.offsetParent();
var po = this.offsetParent.offset();
// This is a special case where we need to modify a offset calculated on start, since the following happened:
// 1. The position of the helper is absolute, so it's position is calculated based on the next positioned parent
// 2. The actual offset parent is a child of the scroll parent, and the scroll parent isn't the document, which means that
// the scroll is included in the initial calculation of the offset of the parent, and never recalculated upon drag
if(this.cssPosition === "absolute" && this.scrollParent[0] !== document && $.contains(this.scrollParent[0], this.offsetParent[0])) {
po.left += this.scrollParent.scrollLeft();
po.top += this.scrollParent.scrollTop();
}
// This needs to be actually done for all browsers, since pageX/pageY includes this information
// with an ugly IE fix
if( this.offsetParent[0] === document.body || (this.offsetParent[0].tagName && this.offsetParent[0].tagName.toLowerCase() === "html" && $.ui.ie)) {
po = { top: 0, left: 0 };
}
return {
top: po.top + (parseInt(this.offsetParent.css("borderTopWidth"),10) || 0),
left: po.left + (parseInt(this.offsetParent.css("borderLeftWidth"),10) || 0)
};
},
_getRelativeOffset: function() {
if(this.cssPosition === "relative") {
var p = this.currentItem.position();
return {
top: p.top - (parseInt(this.helper.css("top"),10) || 0) + this.scrollParent.scrollTop(),
left: p.left - (parseInt(this.helper.css("left"),10) || 0) + this.scrollParent.scrollLeft()
};
} else {
return { top: 0, left: 0 };
}
},
_cacheMargins: function() {
this.margins = {
left: (parseInt(this.currentItem.css("marginLeft"),10) || 0),
top: (parseInt(this.currentItem.css("marginTop"),10) || 0)
};
},
_cacheHelperProportions: function() {
this.helperProportions = {