mxDragSource.prototype.isGridEnabled=function(){return this.gridEnabled};mxDragSource.prototype.setGridEnabled=function(a){this.gridEnabled=a};mxDragSource.prototype.getGraphForEvent=function(a){return null};mxDragSource.prototype.getDropTarget=function(a,b,c,d){return a.getCellAt(b,c)};mxDragSource.prototype.createDragElement=function(a){return this.element.cloneNode(!0)};mxDragSource.prototype.createPreviewElement=function(a){return null};