mxDragSource.prototype.mouseMove=function(a){var b=this.getGraphForEvent(a);null==b||this.graphContainsEvent(b,a)||(b=null);b!=this.currentGraph&&(null!=this.currentGraph&&this.dragExit(this.currentGraph,a),this.currentGraph=b,null!=this.currentGraph&&this.dragEnter(this.currentGraph,a));null!=this.currentGraph&&this.dragOver(this.currentGraph,a);if(null==this.dragElement||null!=this.previewElement&&"visible"==this.previewElement.style.visibility)null!=this.dragElement&&(this.dragElement.style.visibility=