Undoable Drag and Drop in JavaFX

gistfile1.as

Draggable {
    node: node

    var translateX: Number;
    var translateY: Number;

    onStart: function(e) {
        translateX = node.translateX;
        translateY = node.translateY;
    }

    onDone: function(e) {
        undoables.add(Undoable {
            undo: {
                def _translateX = translateX;
                def _translateY = translateY;
                function(): Void {
                    node.translateX = _translateX;
                    node.translateY = _translateY;
                }
            }
            redo: {
                def _translateX = node.translateX;
                def _translateY = node.translateY;
                function(): Void {
                    node.translateX = _translateX;
                    node.translateY = _translateY;
                }
            }
        });
    }
}