Provides drag'n'drop functionality
Creates a GhostDrag object.
Marks element as draggable. When user drags it, a 'ghost' clone is created. Then, the process function is called with this clone as argument. If user drags the clone to one of marked target zones, a callback is performed with three arguments - x, y and target element.
Marks element as not draggable.
Removes all draggable elements from this GhostDrag object.
Marks element as a valid ending zone for drag'n'drop.
Marks element as not a target zone.
Removes all target zones from this GhostDrag object.
var product = Dom.create("img");
var shopping_cart = Dom.create("div");
var gd = new GhostDrag();
var dummyReference = function() {};
var successReference = function(x, y, target) { alert("Success!"); }
gd.addTarget(shopping_cart);
gr.addSource(product, dummyReference, successReference);