Ticket #2161: fixedposition.patch

ui.draggable.js

@@ -94 +94 @@
             var elementPosition = { left: this.elementOffset.left - this.offsetParentOffset.left, top: this.elementOffset.top - this.offsetParentOffset.top };
             this._pageX = e.pageX; this._pageY = e.pageY;
             this.clickOffset = { left: e.pageX - this.elementOffset.left, top: e.pageY - this.elementOffset.top };
+            this.helperFixed = this.helper.css('position') == 'fixed';
             var r = this.helper.css('position') == 'relative';
 
             //Generate the original position
@@ -148 +149 @@
         drag: function(e) {
 
             //Compute the helpers position
-            this.position = { top: e.pageY - this.offset.top, left: e.pageX - this.offset.left };
+            this.position = {
+                top: e.pageY - this.offset.top - ( this.helperFixed ? Math.max(document.documentElement.scrollTop, document.body.scrollTop) : 0 ),
+                left: e.pageX - this.offset.left - ( this.helperFixed ? Math.max(document.documentElement.scrollLeft, document.body.scrollLeft) : 0 )
+            };
             this.positionAbs = { left: e.pageX - this.clickOffset.left, top: e.pageY - this.clickOffset.top };
 
             //Call plugins and callbacks