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 && $.ui.contains(this.scrollParent[0], this.offsetParent[0])) {
po.left += this.scrollParent.scrollLeft();
po.top += this.scrollParent.scrollTop();
}
if((this.offsetParent[0] == document.body) //This needs to be actually done for all browsers, since pageX/pageY includes this information
|| (this.offsetParent[0].tagName && this.offsetParent[0].tagName.toLowerCase() == ‘html’ && $.browser.msie)) //Ugly IE fix
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 = {
width: this.helper.outerWidth(),
height: this.helper.outerHeight()
};
},
_setContainment: function() {
var o = this.options;
if(o.containment == ‘parent’) o.containment = this.helper[0].parentNode;
if(o.containment == ‘document’ || o.containment == ‘window’) this.containment = [
0 – this.offset.relative.left – this.offset.parent.left,
0 – this.offset.relative.top – this.offset.parent.top,
$(o.containment == ‘document’ ? document : window).width() – this.helperProportions.width – this.margins.left,
($(o.containment == ‘document’ ? document : window).height() || document.body.parentNode.scrollHeight) – this.helperProportions.height – this.margins.top
];
if(!(/^(document|window|parent)$/).test(o.containment)) {
var ce = $(o.containment)[0];
var co = $(o.containment).offset();
var over = ($(ce).css(“overflow”) != ‘hidden’);
